1
|
Liu Y, Zhou C, Chen L, Du J, Li Q, Lu C, Tan L, Huang X, Liu J, Dong L. Self-standing membranes for separation: Achievements and opportunities. Adv Colloid Interface Sci 2024; 332:103269. [PMID: 39128434 DOI: 10.1016/j.cis.2024.103269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2024] [Revised: 05/28/2024] [Accepted: 08/03/2024] [Indexed: 08/13/2024]
Abstract
Supported membranes and mixed matrix membranes have a limitation of harming the mass transfer due to the incompatibility between the support layer or the matrix and the active components of the membrane. Self-standing membranes, which could structurally abandon the support layer, altogether avoid the adverse effect, thus greatly facilitating the transmembrane mass transfer process. However, the abandonment of the support layer also reduces the membrane's mechanical properties and formability. In this review, our emphasis will be on self-standing membranes within the realm of materials and separation engineering. We will explore the materials employed in the fabrication of self-standing membranes, highlighting their ability to simultaneously enhance membrane performance and promote self-standing characteristics. Additionally, we will delve into the diverse techniques utilized for crafting self-standing membranes, encompassing interfacial polymerization, filtration, solvent casting, Langmuir-Blodgett & layer-by-layer assembly, electrospinning, compression, etc. Throughout the discussion, the merits and drawbacks associated with each of these preparation methods were elucidated. We also provide a brief overview of the applications of self-standing membranes, including water purification, gas separation, organic solvent nanofiltration, electrochemistry, and membrane reactor, as well as a brief description of the general strategies for performance enhancement of self-standing membranes. Finally, the current status of self-standing membranes and the challenges they may encounter were discussed.
Collapse
Affiliation(s)
- Yunhao Liu
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
| | - Cailong Zhou
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China.
| | - Li Chen
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
| | - Jingcheng Du
- Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230052, PR China
| | - Qun Li
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
| | - Chenyang Lu
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
| | - Luxi Tan
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China.
| | - Xiaowei Huang
- Department of Pharmacy, Quanzhou First Hospital Affiliated to Fujian Medical University, Quanzhou 362000, PR China.
| | - Jiangtao Liu
- Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230052, PR China
| | - Lichun Dong
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
| |
Collapse
|
2
|
Sung CL, Kao TT, Lin YC. Fabrication of Three-Dimensional Dendritic Ag Nanostructures: A SERS Substrate for Non-Invasive Detection. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:1562. [PMID: 39404289 PMCID: PMC11477888 DOI: 10.3390/nano14191562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2024] [Revised: 09/18/2024] [Accepted: 09/23/2024] [Indexed: 10/19/2024]
Abstract
This paper discusses the fabrication of three-dimensional dendritic Ag nanostructures, showcasing pronounced Localized Surface Plasmon Resonance (LSPR) effects. These nanostructures, employed in surface-enhanced Raman scattering (SERS), function as sensors for lactic acid in artificial sweat. The dendritic structures of the silver nanoparticles (AgNPs) create an effective SERS substrate, with additional hotspots at branch junctures enhancing LSPR. We achieve differential LSPR effects by varying the distribution and spacing of branches and the overall morphology. Adjustments to electrodeposition parameters, such as current and plating solution protective agents on an anodized aluminum oxide (AAO) base, allow for precise control over LSPR intensities. By pre-depositing AgNPs, the electron transmission paths during electrodeposition are modified, which leads to optimized dendritic morphology and enhanced LSPR effects. Parameter optimization produces elongated rods with main and secondary branches, covered with uniformly sized, densely packed, non-overlapping spherical AgNPs. This configuration enhances the LSPR effect by generating additional hotspots beyond the branch tips. Fine-tuning the electrodeposition parameters improved the AgNPs' morphology, achieving uniform particle distribution and optimal spacing. Compared to non-SERS substrates, our structure amplified the Raman signal for lactic acid detection by five orders of magnitude. This method can effectively tailor SERS substrates for specific analytes and laser-based detection.
Collapse
Affiliation(s)
- Chia-Ling Sung
- Department of Engineering Science, National Cheng Kung University, Tainan 70101, Taiwan;
| | - Tzung-Ta Kao
- Institute of Photonics Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 82445, Taiwan
| | - Yu-Cheng Lin
- Department of Engineering Science, National Cheng Kung University, Tainan 70101, Taiwan;
| |
Collapse
|
3
|
Heinschke S, Schneider JJ. On the Occurrence of Domain Boundaries and Defects in Self-Organized Ordered Porous Anodic Alumina Systems. J Phys Chem Lett 2024; 15:8608-8612. [PMID: 39145679 DOI: 10.1021/acs.jpclett.4c01776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2024]
Abstract
The formation of domains and defects is a part of every self-organized structure without prepatterning which evolves from the electrochemical oxidation of valve metals like Ti, Al or Ta. Defects and domains, especially in highly ordered porous alumina films (PAOX), are one of the most studied phenomena in the current literature. The focus is on understanding their formation in order to find parameters to minimize their amount for applications that require the most highly organized structures. In this letter we give a solution to this problem by showing that the occurrence of defects and domains is an unavoidable consequence of the underlying self-organized process due to the simultaneous impact of the minimum (MINEP) and maximum (MAXEP) entropy production principle. As a consequence, experimental procedures to manufacture defect-free PAOX-films from a self-organization process face a fundamental limitation.
Collapse
Affiliation(s)
- Silvio Heinschke
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Peter-Grünberg-Str. 12, 64287 Darmstadt, Hessen, Germany
| | - Jörg J Schneider
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Peter-Grünberg-Str. 12, 64287 Darmstadt, Hessen, Germany
| |
Collapse
|
4
|
Sotnichuk SV, Skryabina OV, Shishkin AG, Golovchanskiy IA, Bakurskiy SV, Stolyarov VS, Napolskii KS. Controlled electrodeposition of cobalt nanowires using iRcompensation and their electron transport properties. NANOTECHNOLOGY 2024; 35:465001. [PMID: 39121868 DOI: 10.1088/1361-6528/ad6d72] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2024] [Accepted: 08/09/2024] [Indexed: 08/12/2024]
Abstract
Superconducting hybrid structures based on single nanowires are a new type of nanoscale devices with peculiar transport characteristics. Control over the nanowire structure is essential for understanding hybrid electronic phenomena arising in such complex systems. In this work, we report a technique for the fabrication of cobalt nanowires by template-assisted electrodeposition usingiRcompensation, which allows revealing the fundamental dependence of the preferred direction of nanowire growth on the deposition potential. Long coarse-grained cobalt nanowires with a diameter of 70 nm have been implemented into Nb/Co/Nb hybrid structures. We demonstrate that using electrode fabrication techniques that do not contaminate the surface of the nanowire leads to a high quality of devices with low-resistance interfaces. Low-temperature resistivity of 4.94 ± 0.83µΩ cm and other transport characteristics of Co nanowires are reported. The absence of long-range superconducting proximity effect for Nb/Co/Nb systems with different nanowire length is discussed.
Collapse
Affiliation(s)
- Stepan V Sotnichuk
- National University of Science and Technology MISIS, Moscow 119049, Russia
| | - Olga V Skryabina
- National University of Science and Technology MISIS, Moscow 119049, Russia
| | - Andrey G Shishkin
- National University of Science and Technology MISIS, Moscow 119049, Russia
| | | | - Sergey V Bakurskiy
- National University of Science and Technology MISIS, Moscow 119049, Russia
| | - Vasily S Stolyarov
- National University of Science and Technology MISIS, Moscow 119049, Russia
| | - Kirill S Napolskii
- National University of Science and Technology MISIS, Moscow 119049, Russia
| |
Collapse
|
5
|
Díaz-Lobo A, Martin-Gonzalez M, Song Q, Morales-Sabio Á, Retsch M, Manzano CV. Metallic Coatings Boost the Cooling Power of Nanoporous Alumina. ACS APPLIED ENGINEERING MATERIALS 2024; 2:2069-2079. [PMID: 39205810 PMCID: PMC11348419 DOI: 10.1021/acsaenm.4c00245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Revised: 06/09/2024] [Accepted: 07/12/2024] [Indexed: 09/04/2024]
Abstract
Passive daytime radiative cooling (PDRC) has emerged as a promising strategy to mitigate the increasing impact of heat waves. However, achieving effective PDRCs requires cost-effective, ecofriendly, and industrially scalable materials. In this study, we investigate the potential of anodic aluminum oxide (AAO) nanostructures coated with metals as passive radiative coolers. We explore the effects of different metallic coatings (Al and Au) with varying thicknesses (ranging from 20 to 100 nm) on the cooling performance of the AAO nanostructures. Our finding reveals a maximum temperature reduction (ΔT) of 12.5 °C for 60 nm of Au coating. Furthermore, we demonstrate the dependence of the cooling performance on ambient temperature, emphasizing the practical benefits of these enhanced AAO-based radiative coolers for real-world applications. Notably, our results surpass previous works, offering an avenue to enhance the PDRC capability.
Collapse
Affiliation(s)
- Alba Díaz-Lobo
- Instituto
de Micro y Nanotecnología, IMN-CNM, CSIC (CEI UAM + CSIC), Isaac Newton, 8, E-28706 Tres Cantos, Madrid, Spain
| | - Marisol Martin-Gonzalez
- Instituto
de Micro y Nanotecnología, IMN-CNM, CSIC (CEI UAM + CSIC), Isaac Newton, 8, E-28706 Tres Cantos, Madrid, Spain
| | - Qimeng Song
- Department
of Chemistry, Physical Chemistry I, University
of Bayreuth, 95447 Bayreuth, Germany
| | - Ángel Morales-Sabio
- Centro
de Investigaciones Energéticas, Medioambientales y Tecnológicas
(CIEMAT), Avda. Complutense,
22, E-28040 Madrid, Spain
| | - Markus Retsch
- Department
of Chemistry, Physical Chemistry I, University
of Bayreuth, 95447 Bayreuth, Germany
| | - Cristina V. Manzano
- Instituto
de Micro y Nanotecnología, IMN-CNM, CSIC (CEI UAM + CSIC), Isaac Newton, 8, E-28706 Tres Cantos, Madrid, Spain
| |
Collapse
|
6
|
Wankhede S, Pillai DS. Nature of instability in flow-driven porous anodic oxide. CHAOS (WOODBURY, N.Y.) 2024; 34:073136. [PMID: 39038468 DOI: 10.1063/5.0215034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Accepted: 07/03/2024] [Indexed: 07/24/2024]
Abstract
Self-organized porous anodic oxide films are formed by the electrochemical oxidation of reactive metal aluminum in acidic solutions in which the oxide is soluble. Recently, viscous flow models have shown using linear stability analysis that the instability results from a trade-off between the destabilizing effect of viscous flow of oxide and the stabilizing effect of oxide formation, which provides the wavelength selection mechanism for pattern formation. Anion adsorption on surface growth sites causes nonuniform compressive stress at the oxide-solution interface, which drives the flow. This anodic instability is analogous to the classical Marangoni instability induced by surface tension gradients. In this work, nature of the instability beyond the stability threshold is determined using a weakly nonlinear analysis. For the growth of well-developed pores beyond the threshold, a subcritical nature of the instability is essential. However, our weakly nonlinear analysis shows that the solutions emerging from neutral stability are supercritical in nature at all wavenumbers for the practical range of anodizing control parameters investigated. We also determine the region where the model is Hadamard stable, a necessary condition for well-posedness.
Collapse
Affiliation(s)
- Sajal Wankhede
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Uttar Pradesh 208016, India
| | - Dipin S Pillai
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Uttar Pradesh 208016, India
| |
Collapse
|
7
|
Díaz-Lobo A, Martin-Gonzalez M, Morales-Sabio Á, Manzano CV. Suitability of Anodic Porous Alumina as a Passive Radiative Cooler: An In-Depth Study. ACS APPLIED OPTICAL MATERIALS 2024; 2:980-990. [PMID: 38962566 PMCID: PMC11220729 DOI: 10.1021/acsaom.3c00216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 07/31/2023] [Accepted: 07/31/2023] [Indexed: 07/05/2024]
Abstract
Passive radiative cooling technology has the potential to revolutionize the way of cooling buildings and devices, while also helping to reduce the carbon footprint and energy consumption. Pioneer works involving anodic aluminum oxide (AAO) nanostructures showed controversial results. In this work, we clarify how the morphological properties and chemical structure of AAO-Al samples affect their optical properties and their cooling performance. Changes in thickness, interpore distance, and porosity of the alumina layer, as well as the used counterions, significantly affect the cooling ability of the AAO-Al structure. We measure a maximum temperature reduction, ΔT, of 8.0 °C under direct sunlight on a summer day in Spain, coinciding with a calculated peak cooling power, P cool, of 175 W/m2, using an AAO-Al sample anodized in sulfuric acid, with 12 μm of AAO thickness and 10% of porosity. These results represent a significant improvement over previous studies, demonstrating the potential of AAO nanostructures to be used in thermal management applications.
Collapse
Affiliation(s)
- Alba Díaz-Lobo
- Instituto
de Micro y Nanotecnología, IMN-CNM, CSIC (CEI UAM + CSIC), Isaac Newton, 8, E-28706 Tres Cantos, Madrid, Spain
| | - Marisol Martin-Gonzalez
- Instituto
de Micro y Nanotecnología, IMN-CNM, CSIC (CEI UAM + CSIC), Isaac Newton, 8, E-28706 Tres Cantos, Madrid, Spain
| | - Ángel Morales-Sabio
- Centro
de Investigaciones Energéticas, Medioambientales y Tecnológicas
(CIEMAT), Avda. Complutense,
22, E-28040 Madrid, Spain
| | - Cristina V. Manzano
- Instituto
de Micro y Nanotecnología, IMN-CNM, CSIC (CEI UAM + CSIC), Isaac Newton, 8, E-28706 Tres Cantos, Madrid, Spain
| |
Collapse
|
8
|
López-Escalante MC, Martínez de Yuso MV, Cuevas AL, Benavente J. Optical Modification of a Nanoporous Alumina Structure Associated with Surface Coverage by the Ionic Liquid AliquatCl. MICROMACHINES 2024; 15:739. [PMID: 38930709 PMCID: PMC11206012 DOI: 10.3390/mi15060739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Revised: 05/26/2024] [Accepted: 05/29/2024] [Indexed: 06/28/2024]
Abstract
This manuscript analyses changes in the optical parameters of a commercial alumina nanoporous structure (AnodiscTM or AND support) due to surface coverage by the ionic liquid (IL) AliquatCl (AlqCl). XPS measurements were performed for chemical characterization of the composite AND/AlqCl and the AND support, but XPS resolved angle analysis (from 15° to 75°) was carried out for the homogeneity estimation of the top surface of the ANDAlqCl sample. Optical characterization of both the composite AND/AlqCl and the AND support was performed by three non-destructive and non-invasive techniques: ellipsometry spectroscopy (SE), light transmittance/reflection, and photoluminescence. SE measurements (wavelength ranging from 250 nm to 1250 nm) allow for the determination of the refraction index of the AND/AlqCl sample, which hardly differs from that corresponding to the IL, confirming the XPS results. The presence of the IL significantly increases the light transmission of the alumina support in the visible region and reduces reflection, affecting also the maximum position of this latter curve, as well as the photoluminescence spectra. Due to these results, illuminated I-V curves for both the composite AND/AlqCl film and the AND support were also measured to estimate its possible application as a solar cell. The optical behaviour exhibited by the AND/AlqCl thin film in the visible region could be of interest for different applications.
Collapse
Affiliation(s)
- María Cruz López-Escalante
- The Nanotech Unit, Laboratorio de Materiales y Superficies, Departamento de Ingeniería Química, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain;
| | - Mª Valle Martínez de Yuso
- Laboratorio de Espectroscopía de Rayos X, Servicios Centrales de Apoyo a la Investigación (SCAI), Universidad de Málaga, 29071 Málaga, Spain;
| | - Ana L. Cuevas
- Unidad de Nanotecnología, Servicios Centrales de Apoyo a la Investigación (SCAI), Universidad de Málaga, 29071 Málaga, Spain;
| | - Juana Benavente
- Departamento de Física Aplicada I, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
| |
Collapse
|
9
|
Laucirica G, Toum-Terrones Y, Cayón VM, Toimil-Molares ME, Azzaroni O, Marmisollé WA. Advances in nanofluidic field-effect transistors: external voltage-controlled solid-state nanochannels for stimulus-responsive ion transport and beyond. Phys Chem Chem Phys 2024; 26:10471-10493. [PMID: 38506166 DOI: 10.1039/d3cp06142f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
Ion channels, intricate protein structures facilitating precise ion passage across cell membranes, are pivotal for vital cellular functions. Inspired by the remarkable capabilities of biological ion channels, the scientific community has ventured into replicating these principles in fully abiotic solid-state nanochannels (SSNs). Since the gating mechanisms of SSNs rely on variations in the physicochemical properties of the channel surface, the modification of their internal architecture and chemistry constitutes a powerful strategy to control the transport properties and, consequently, render specific functionalities. In this framework, both the design of the nanofluidic platform and the subsequent selection and attachment of different building blocks gain special attention. Similar to biological ion channels, functional SSNs offer the potential to finely modulate ion transport in response to various stimuli, leading to innovations in a variety of fields. This comprehensive review delves into the intricate world of ion transport across stimuli-responsive SSNs, focusing on the development of external voltage-controlled nanofluidic devices. This kind of field-effect nanofluidic technology has attracted special interest due to the possibility of real-time reconfiguration of the ion transport with a non-invasive strategy. These properties have found interesting applications in drug delivery, biosensing, and nanoelectronics. This document will address the fundamental principles of ion transport through SSNs and the construction, modification, and applications of external voltage-controlled SSNs. It will also address future challenges and prospects, offering a comprehensive perspective on this evolving field.
Collapse
Affiliation(s)
- G Laucirica
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET - CC 16 Suc. 4, 1900 La Plata, Argentina.
| | - Y Toum-Terrones
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET - CC 16 Suc. 4, 1900 La Plata, Argentina.
| | - V M Cayón
- Department of Materials- and Geosciences, Technical University of Darmstadt, Darmstadt, Germany
| | - M E Toimil-Molares
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- Department of Materials- and Geosciences, Technical University of Darmstadt, Darmstadt, Germany
| | - O Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET - CC 16 Suc. 4, 1900 La Plata, Argentina.
| | - W A Marmisollé
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET - CC 16 Suc. 4, 1900 La Plata, Argentina.
| |
Collapse
|
10
|
Li C, Li P, Chen Q, Zhu X, Wang B, Zhu X. Optimization of Photoelectrochemical Response on TiO 2 Nanotube Arrays Treated by H 3PO 4 and Mechanism Analysis of the Slowing Down Effect during Preparation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:7001-7007. [PMID: 38517391 DOI: 10.1021/acs.langmuir.4c00007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/23/2024]
Abstract
The process control of anodization has been a hot topic for a long time. In this study, the addition of phosphoric acid to the traditional electrolyte changed the ion distribution on the reaction interface and the composition of the anion contamination layer so as to achieve the slowing down effect on anodization, the mechanism and theoretical model of which are also given in this paper. TiO2 is a common material in photoelectrocatalysis, but there are few studies on the photoelectrochemical performance of TiO2 nanotube arrays. The stability and rapidity of the photoelectrochemical response of TiO2 nanotube arrays prepared in phosphoric acid containing an electrolyte were effectively optimized in this study.
Collapse
Affiliation(s)
- Chengyuan Li
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Pengze Li
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Qianqiao Chen
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Xiangxiang Zhu
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Bing Wang
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Xufei Zhu
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, China
| |
Collapse
|
11
|
Eftekhari K, Parakhonskiy BV, Grigoriev D, Skirtach AG. Advances in Nanoarchitectonics: A Review of "Static" and "Dynamic" Particle Assembly Methods. MATERIALS (BASEL, SWITZERLAND) 2024; 17:1051. [PMID: 38473523 DOI: 10.3390/ma17051051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 01/20/2024] [Accepted: 02/09/2024] [Indexed: 03/14/2024]
Abstract
Particle assembly is a promising technique to create functional materials and devices from nanoscale building blocks. However, the control of particle arrangement and orientation is challenging and requires careful design of the assembly methods and conditions. In this study, the static and dynamic methods of particle assembly are reviewed, focusing on their applications in biomaterial sciences. Static methods rely on the equilibrium interactions between particles and substrates, such as electrostatic, magnetic, or capillary forces. Dynamic methods can be associated with the application of external stimuli, such as electric fields, magnetic fields, light, or sound, to manipulate the particles in a non-equilibrium state. This study discusses the advantages and limitations of such methods as well as nanoarchitectonic principles that guide the formation of desired structures and functions. It also highlights some examples of biomaterials and devices that have been fabricated by particle assembly, such as biosensors, drug delivery systems, tissue engineering scaffolds, and artificial organs. It concludes by outlining the future challenges and opportunities of particle assembly for biomaterial sciences. This review stands as a crucial guide for scholars and professionals in the field, fostering further investigation and innovation. It also highlights the necessity for continuous research to refine these methodologies and devise more efficient techniques for nanomaterial synthesis. The potential ramifications on healthcare and technology are substantial, with implications for drug delivery systems, diagnostic tools, disease treatments, energy storage, environmental science, and electronics.
Collapse
Affiliation(s)
- Karaneh Eftekhari
- Nanobiotechnology Group, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium
| | - Bogdan V Parakhonskiy
- Nanobiotechnology Group, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium
| | - Dmitry Grigoriev
- Multifunctional Colloids and Coatings, Division Life Science and Bioprocesses, Fraunhofer Institute for Applied Polymer Research (IAP), 14476 Potsdam-Golm, Germany
| | - Andre G Skirtach
- Nanobiotechnology Group, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium
| |
Collapse
|
12
|
Kushnir SE, Devyanina NP, Roslyakov IV, Lyskov NV, Stolyarov VS, Napolskii KS. Stained Glass Effect in Anodic Aluminum Oxide Formed in Selenic Acid. J Phys Chem Lett 2024; 15:298-306. [PMID: 38166418 DOI: 10.1021/acs.jpclett.3c03287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
A combination of the unique porous structure and physical and chemical properties of anodic aluminum oxide (AAO) makes it widely used in cutting-edge areas of materials science and nanotechnology. Selenic acid electrolyte provides the ability to obtain AAO with low porosity and high optical transparency and thus is promising for the preparation of AAO photonic crystals (PhCs). Here, we show the influence of crystallographic orientation of Al on the electrochemical oxidation rate in 1 M H2SeO4 as well as on the growth rate, porosity, and the effective refractive index of AAO. The cyclic anodization regime is used to prepare AAO PhCs with photonic band gaps, their wavelength positions are used to measure the AAO growth rate. At an anodization voltage of 40-45 V, the growth rate varies by up to 22.6% with crystallographic orientation of Al grains, causing the stained glass effect, which can be seen with the naked eye.
Collapse
Affiliation(s)
| | | | | | - Nikolay V Lyskov
- Federal Research Center of Problems of Chemical Physics and Medical Chemistry RAS, Chernogolovka, Moscow region 142432, Russia
| | - Vasily S Stolyarov
- Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain
- LPEM, ESPCI Paris, PSL Research University, CNRS, 75005 Paris, France
| | | |
Collapse
|
13
|
Zhang Y, Wang H, Wang J, Li L, Sun H, Wang C. Asymmetric Nanoporous Alumina Membranes for Nanofluidic Osmotic Energy Conversion. Chem Asian J 2023; 18:e202300876. [PMID: 37886875 DOI: 10.1002/asia.202300876] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 10/26/2023] [Accepted: 10/27/2023] [Indexed: 10/28/2023]
Abstract
The potential of harnessing osmotic energy from the interaction between seawater and river water has been recognized as a promising, eco-friendly, renewable, and sustainable source of power. The reverse electrodialysis (RED) technology has gained significant interest for its ability to generate electricity by combining concentrated and diluted streams with different levels of salinity. Nanofluidic membranes with tailored ion transport dynamics enable efficient harvesting of renewable osmotic energy. In this regard, anodic aluminum oxide (AAO) membranes with abundant nanochannels provide a cost-effective nanofluidic platform to obtain structures with a high density of ordered pores. AAO can be utilized in constructing asymmetric composite membranes with enhanced ion flux and selectivity to improve output power generation. In this review, we first present the fundamental structure and properties of AAO, followed by summarizing the fabrication techniques for asymmetric membranes using AAO and other nanostructured materials. Subsequently, we discuss the materials employed in constructing asymmetric structures incorporating AAO while emphasizing how material selection and design can resist and promote efficient energy conversion. Finally, we provide an outlook on future applications and address the challenges that need to be overcome for successful osmotic energy conversion.
Collapse
Affiliation(s)
- Yao Zhang
- College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China
| | - Huijie Wang
- College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China
| | - Jin Wang
- College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China
| | - Lulu Li
- College of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212000, P.R. China
| | - Hanjun Sun
- College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China
| | - Chen Wang
- College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China
- State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing, 210023, China
| |
Collapse
|
14
|
Heinschke S, Schneider JJ. Comment on Pashchanka, M. Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces. Nanomaterials 2021, 11, 2271. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2876. [PMID: 37947720 PMCID: PMC10647230 DOI: 10.3390/nano13212876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 06/09/2023] [Accepted: 10/23/2023] [Indexed: 11/12/2023]
Abstract
In the review article "Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces" [...].
Collapse
Affiliation(s)
- Silvio Heinschke
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Peter-Grünberg-Str. 12, 64287 Darmstadt, Germany
| | | |
Collapse
|
15
|
Vakilinejad A, Dubois E, Michot L, Jardat M, Lairez D, Durand-Vidal S, Guibert C, Jouault N. Electrical surface properties of nanoporous alumina membranes: influence of nanochannels' curvature, roughness and composition studied via electrokinetic experiments. Phys Chem Chem Phys 2023; 25:28150-28161. [PMID: 37818652 DOI: 10.1039/d3cp04067d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/12/2023]
Abstract
Among classical nanoporous oxide membranes, anodic aluminum oxide (AAO) membranes, made of non-connected, parallel and ordered nanochannels, are very interesting nanoporous model systems widely used for multiple applications. Since most of these applications involve local phenomena at the nanochannel surface, the fine description of the electrical surface behavior in aqueous solution is thus of primordial interest. Here, we use an original experimental approach combining several electrokinetic techniques (tangential and transverse streaming potential as well as electrophoretic mobility experiments) to measure the ζ-potential and determine the surface isoelectric points (IEPs) of several AAOs having different characteristic sizes and compositions. Using such an approach, all the different surfaces available in AAOs can be probed: outer surfaces (top and bottom planes), pore wall surfaces (i.e., inner surfaces) and surfaces created by the grinding of the AAOs. We find clear IEP differences between the outer, pore wall and ground surfaces and discuss these in terms of nanochannel and surface morphology (curvature and roughness) and of modifications of the chemical environment of the surface hydroxyl groups. These results highlight the heterogeneities between the different surfaces of these AAO membranes and emphasize the necessity to combine complementary electrokinetic techniques to properly understand the material, an approach which can be extended to many nanoporous systems.
Collapse
Affiliation(s)
- Ali Vakilinejad
- Sorbonne Université, Laboratoire PHENIX, CNRS, UMR 8234, 4 place Jussieu, 75005 Paris, France.
| | - Emmanuelle Dubois
- Sorbonne Université, Laboratoire PHENIX, CNRS, UMR 8234, 4 place Jussieu, 75005 Paris, France.
| | - Laurent Michot
- Sorbonne Université, Laboratoire PHENIX, CNRS, UMR 8234, 4 place Jussieu, 75005 Paris, France.
| | - Marie Jardat
- Sorbonne Université, Laboratoire PHENIX, CNRS, UMR 8234, 4 place Jussieu, 75005 Paris, France.
| | - Didier Lairez
- Laboratoire des Solides Irradiés (LSI), École polytechnique, CNRS, CEA, Institut Polytechnique de Paris, 91128 Palaiseau Cedex, France
| | - Serge Durand-Vidal
- Sorbonne Université, Laboratoire PHENIX, CNRS, UMR 8234, 4 place Jussieu, 75005 Paris, France.
| | - Clément Guibert
- Sorbonne Université & CNRS, UMR 7197, Laboratoire de Réactivité de Surface (LRS), 4 Place Jussieu, 75252 Paris Cedex 05, France
| | - Nicolas Jouault
- Sorbonne Université, Laboratoire PHENIX, CNRS, UMR 8234, 4 place Jussieu, 75005 Paris, France.
| |
Collapse
|
16
|
Jiao S, Zhang Y, Li Y, Maryam B, Xu S, Liu W, Liu M, Li J, Zhang X, Liu X. Evaporation Driven Hydrovoltaic Generator Based on Nano-Alumina-Coated Polyethylene Terephthalate Film. Polymers (Basel) 2023; 15:4079. [PMID: 37896323 PMCID: PMC10610091 DOI: 10.3390/polym15204079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 10/03/2023] [Accepted: 10/11/2023] [Indexed: 10/29/2023] Open
Abstract
Collecting energy from the ambient environment through green and sustainable methods is highly expected to alleviate pollution and energy problems worldwide. Here, we report a facile and flexible hydrovoltaic generator capable of utilizing natural water evaporation for sustainable electricity production. The generator was fabricated by coating nano-Al2O3 on a twistable polyethylene terephthalate film. An open circuit voltage of 1.7 V was obtained on a piece of centimeter-sized hydrovoltaic generator under ambient conditions. The supercapacitor charged by the hydrovoltaic device can power a mini-motor efficiently. Moreover, by expanding the size or connecting it in series/parallel, the energy output of the generator can be further improved. Finally, the influence factors and the mechanism for power generation were primarily investigated. Electrical energy is produced by the migration of water through charged capillary channels. The environmental conditions, the properties of the solution and the morphology of the film have important effects on the electrical performance. This study is anticipated to offer enlightenment into designing novel hydrovoltaic devices, providing diverse energy sources for various self-powered devices and systems.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | | | | | - Xianhua Liu
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300354, China; (S.J.); (Y.Z.); (Y.L.); (B.M.); (S.X.); (W.L.); (M.L.); (J.L.); (X.Z.)
| |
Collapse
|
17
|
Zaraska L, Szuwarzyński M, Świerkula A, Brzózka A. Effect of Al Polishing Conditions on the Growth and Morphology of Porous Anodic Alumina Films. ACS OMEGA 2023; 8:34564-34574. [PMID: 37779956 PMCID: PMC10536036 DOI: 10.1021/acsomega.3c03412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 09/07/2023] [Indexed: 10/03/2023]
Abstract
The conditions applied during the electrochemical polishing of aluminum were found to be important parameters for the successive formation of nanoporous alumina films. First, a high-purity Al foil was electrochemically polished in an aqueous solution containing C2H5OH and HClO4 at various sets of conditions, such as applied potential (5-35 V), temperature (0-20 °C), and process duration (10-180 s). Extensive studies of the topography of Al after polishing by scanning electron microscopy and atomic force microscopy allow verification of the correlations between conditions applied during the substrate pretreatment and dimensions of the nanopatterns generated on the metal surface. Next, Al polished samples at two different sets of conditions were used as starting materials for anodization. Unpolished Al samples were also anodized for reference. It was confirmed that electropolishing conditions do not significantly affect the oxide growth rate during anodization and the efficiency of anodic film formation. On the contrary, it was proved that the dimensions of the surface texture formed during Al polishing significantly affect the morphology and pore order within the anodic film. Therefore, it can be stated that it is possible to tune to some extent the arrangement of nanochannels within anodic aluminum oxide films by simply changing conditions during the electropolishing procedure..
Collapse
Affiliation(s)
- Leszek Zaraska
- Faculty
of Chemistry, Department of Physical Chemistry and Electrochemistry, Jagiellonian University, Gronostajowa 2, Krakow 30-387, Poland
| | - Michał Szuwarzyński
- Academic
Centre for Materials and Nanotechnology, AGH University of Science and Technology, A. Mickiewicza 30, Krakow 30-059, Poland
| | - Aleksandra Świerkula
- Faculty
of Chemistry, Department of Physical Chemistry and Electrochemistry, Jagiellonian University, Gronostajowa 2, Krakow 30-387, Poland
| | - Agnieszka Brzózka
- Faculty
of Chemistry, Department of Physical Chemistry and Electrochemistry, Jagiellonian University, Gronostajowa 2, Krakow 30-387, Poland
| |
Collapse
|
18
|
Ruiz-Clavijo A, Pérez N, Caballero-Calero O, Blanco J, Peiró F, Plana-Ruiz S, López-Haro M, Nielsch K, Martín-González M. Localization and Directionality of Surface Transport in Bi 2Te 3 Ordered 3D Nanonetworks. ACS NANO 2023; 17:16960-16967. [PMID: 37410703 PMCID: PMC10510701 DOI: 10.1021/acsnano.3c04160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 06/30/2023] [Indexed: 07/08/2023]
Abstract
The resistance of an ordered 3D-Bi2Te3 nanowire nanonetwork was studied at low temperatures. Below 50 K the increase in resistance was found to be compatible with the Anderson model for localization, considering that conduction takes place in individual parallel channels across the whole sample. Angle-dependent magnetoresistance measurements showed a distinctive weak antilocalization characteristic with a double feature that we could associate with transport along two perpendicular directions, dictated by the spatial arrangement of the nanowires. The coherence length obtained from the Hikami-Larkin-Nagaoka model was about 700 nm across transversal nanowires, which corresponded to approximately 10 nanowire junctions. Along the individual nanowires, the coherence length was greatly reduced to about 100 nm. The observed localization effects could be the reason for the enhancement of the Seebeck coefficient observed in the 3D-Bi2Te3 nanowire nanonetwork compared to individual nanowires.
Collapse
Affiliation(s)
- Alejandra Ruiz-Clavijo
- Instituto
de Micro y Nanotecnología, IMN-CNM, CSIC (CEI UAM+CSIC) Isaac Newton 8, E-28760, Tres Cantos, Madrid, Spain
| | - Nicolás Pérez
- Institute
for Metallic Materials, IFW-Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - Olga Caballero-Calero
- Instituto
de Micro y Nanotecnología, IMN-CNM, CSIC (CEI UAM+CSIC) Isaac Newton 8, E-28760, Tres Cantos, Madrid, Spain
| | - Javier Blanco
- LENS-MIND,
Department of Electronics and Biomedical Engineering, Universitat de Barcelona, 08028 Barcelona, Spain
- Institute
of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Francesca Peiró
- LENS-MIND,
Department of Electronics and Biomedical Engineering, Universitat de Barcelona, 08028 Barcelona, Spain
- Institute
of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Sergi Plana-Ruiz
- LENS-MIND,
Department of Electronics and Biomedical Engineering, Universitat de Barcelona, 08028 Barcelona, Spain
- Scientific
& Technical Resources, Universitat Rovira
i Virgili, 43007 Tarragona, Spain
| | - Miguel López-Haro
- Departamento
de Ciencia de los Materiales e Ingeniería Metalúrgica
y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Cádiz 11510, Spain
| | - Kornelius Nielsch
- Institute
for Metallic Materials, IFW-Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - Marisol Martín-González
- Instituto
de Micro y Nanotecnología, IMN-CNM, CSIC (CEI UAM+CSIC) Isaac Newton 8, E-28760, Tres Cantos, Madrid, Spain
| |
Collapse
|
19
|
Cigane U, Palevicius A, Janusas G. A Free-Standing Chitosan Membrane Prepared by the Vibration-Assisted Solvent Casting Method. MICROMACHINES 2023; 14:1419. [PMID: 37512730 PMCID: PMC10386678 DOI: 10.3390/mi14071419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 07/05/2023] [Accepted: 07/13/2023] [Indexed: 07/30/2023]
Abstract
Much attention has been paid to the surface modification of artificial skin barriers for the treatment of skin tissue damage. Chitosan is one of the natural materials that could be characterized by its biocompatibility. A number of methods for the preparation of chitosan membranes have been described in scientific articles, including solvent casting methods. This study investigates an improved technology to produce chitosan membranes. Thus, chitosan membranes were prepared using a vibration-assisted solvent casting method. First, aqueous acetic acid was used to pretreat chitosan. Then, free-standing chitosan membranes were prepared by solvent casting on nanoporous anodized aluminum oxide (AAO) membrane templates, allowing for the solvent to evaporate. Using finite element methods, a study was obtained showing the influence of chitosan solutions of different concentrations on the fluid flow into nanopores using high-frequency excitation. The height of the nanopillars and the surface area of the chitosan membrane were also evaluated. In this study, the surface area of the chitosan membrane was found to increase by 15, 10 and 6 times compared to the original flat surface area. The newly produced nanopillared chitosan membranes will be applicable in the fabrication of skin barriers due to the longer nanopillars on their surface and the larger surface area.
Collapse
Affiliation(s)
- Urte Cigane
- Faculty of Mechanical Engineering and Design, Kaunas University of Technology, Studentu Street 56, 51424 Kaunas, Lithuania
| | - Arvydas Palevicius
- Faculty of Mechanical Engineering and Design, Kaunas University of Technology, Studentu Street 56, 51424 Kaunas, Lithuania
| | - Giedrius Janusas
- Faculty of Mechanical Engineering and Design, Kaunas University of Technology, Studentu Street 56, 51424 Kaunas, Lithuania
| |
Collapse
|
20
|
Pereira A, Sáez G, Saavedra E, Escrig J. Tunable Magnetic Properties of Interconnected Permalloy Nanowire Networks. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1971. [PMID: 37446487 DOI: 10.3390/nano13131971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 06/22/2023] [Accepted: 06/25/2023] [Indexed: 07/15/2023]
Abstract
In this study, we investigate the magnetic properties of interconnected permalloy nanowire networks using micromagnetic simulations. The effects of interconnectivity on the hysteresis curves, coercivity, and remanence of the nanowire networks are analyzed. Our results reveal intriguing characteristics of the hysteresis curves, including nonmonotonic behaviors of coercivity as a function of the position of horizontal nanowires relative to vertical nanowires. By introducing horizontal nanowires at specific positions, the coercivity of the nanowire networks can be enhanced without altering the material composition. The normalized remanence remains relatively constant regardless of the position of the horizontal wires, although it is lower in the interconnected nanowire arrays compared to nonconnected arrays. These findings provide valuable insights into the design and optimization of nanowire networks for applications requiring tailored magnetic properties.
Collapse
Affiliation(s)
- Alejandro Pereira
- Department of Sciences, Faculty of Liberal Arts, Adolfo Ibañez University, Santiago 7941169, Chile
| | - Guidobeth Sáez
- Department of Physics, Faculty of Physical and Mathematical Sciences, University of Chile, Santiago 8370448, Chile
| | - Eduardo Saavedra
- Department of Physics, University of Santiago de Chile (USACH), Santiago 9170124, Chile
| | - Juan Escrig
- Department of Physics, University of Santiago de Chile (USACH), Santiago 9170124, Chile
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Santiago 9170124, Chile
| |
Collapse
|
21
|
Nana AB, Marimuthu T, Wamwangi D, Kondiah PPD, Choonara YE. Design and Evaluation of Composite Magnetic Iron-Platinum Nanowires for Targeted Cancer Nanomedicine. Biomedicines 2023; 11:1857. [PMID: 37509497 PMCID: PMC10377173 DOI: 10.3390/biomedicines11071857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 06/21/2023] [Accepted: 06/27/2023] [Indexed: 07/30/2023] Open
Abstract
The purpose of the study was to synthesize and investigate the influence of geometrical structure, magnetism, and cytotoxic activity on core-shell platinum and iron-platinum (Fe/Pt) composite nanowires (NWs) for potential application in targeted chemotherapeutic approaches. The Pt-NWs and Fe/Pt composite NWs were synthesized via template electrodeposition, using anodic aluminum oxide (AAO) membranes. The Fe/Pt composite NWs (Method 1) was synthesized using two electrodeposition steps, allowing for greater control of the diameter of the NW core. The Fe/Pt composite NWs (Method 2) was synthesized by pulsed electrodeposition, using a single electrolytic bath. The properties of the synthesized NWs were assessed by high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, powder X-ray diffraction (XRD), inductively coupled plasma-optical emission spectrometry (ICP-OES), vibrating-sample magnetometry (VSM), and surface charge (zeta potential). A microscopy image analysis of the NWs revealed the presence of high-aspect-ratio NWs with nominal diameters of 40-50 nm and lengths of approximately <4 µm. The obtained powder XRD patterns confirmed the presence of a polycrystalline structure for both Pt NWs and Fe/Pt composite NWs. The potential utility of the synthesized NW nanoplatforms for anticancer activity was investigated using Tera 1 cells and Mouse 3T3 cells. Pt-NWs displayed modest cytotoxic activity against Tera 1 cells, while the Fe/Pt composite NWs (both Methods 1 and 2) demonstrated enhanced cytotoxic activity compared to the Pt-NWs on Tera 1 cells. The Fe/Pt composite NWs (Method 1) displayed ferromagnetic behavior and enhanced cytotoxic activity compared to Pt-NWs on Tera 1 cells, thus providing a sound basis for future magnetically targeted chemotherapeutic applications.
Collapse
Affiliation(s)
- Abu Bakr Nana
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, Johannesburg 2193, South Africa
| | - Thashree Marimuthu
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, Johannesburg 2193, South Africa
| | - Daniel Wamwangi
- School of Physics, Materials Physics Research Institute, University of the Witwatersrand, Private Bag 3, WITS, Johannesburg 2050, South Africa
| | - Pierre P D Kondiah
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, Johannesburg 2193, South Africa
| | - Yahya E Choonara
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, Johannesburg 2193, South Africa
| |
Collapse
|
22
|
Wagner MFP, Paulus AS, Sigle W, Brötz J, Trautmann C, Voss KO, Völklein F, Toimil-Molares ME. Experimental evidence of a size-dependent sign change of the Seebeck coefficient of Bi nanowire arrays. Sci Rep 2023; 13:8290. [PMID: 37217560 DOI: 10.1038/s41598-023-35065-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 05/11/2023] [Indexed: 05/24/2023] Open
Abstract
The electrical transport in bismuth nanowires is strongly influenced by both sample geometry and crystallinity. Compared to bulk bismuth, the electrical transport in nanowires is dominated by size effects and influenced by surface states, which gain increasing relevance with increasing surface-to-volume ratios, i.e. with decreasing wire diameter. Bismuth nanowires with tailored diameter and crystallinity constitute, therefore, excellent model systems, allowing to study the interplay of the different transport phenomena. Here, we present temperature-dependent Seebeck coefficient and relative electrical resistance measurements of parallel bismuth nanowire arrays with diameters between 40 and 400 nm synthesized by pulsed electroplating in polymer templates. Both electrical resistance and Seebeck coefficient exhibit a non-monotonic temperature dependence, with the sign of the Seebeck coefficient changing from negative to positive with decreasing temperature. The observed behavior is size-dependent and is attributed to limitations of the mean free path of the charge carriers within the nanowires. The observed size-dependent Seebeck coefficient and in particular the size-dependent sign change opens a promising avenue for single-material thermocouples with p- and n-legs made from nanowires with different diameters.
Collapse
Affiliation(s)
| | - Anna Sarina Paulus
- Materials Research Department, GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany
- Department of Materials and Earth Sciences, Technische Universität Darmstadt, 64287, Darmstadt, Germany
| | - Wilfried Sigle
- Max Planck Institute for Solid State Research, 70569, Stuttgart, Germany
| | - Joachim Brötz
- Department of Materials and Earth Sciences, Technische Universität Darmstadt, 64287, Darmstadt, Germany
| | - Christina Trautmann
- Materials Research Department, GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany
- Department of Materials and Earth Sciences, Technische Universität Darmstadt, 64287, Darmstadt, Germany
| | - Kay-Obbe Voss
- Materials Research Department, GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany
| | - Friedemann Völklein
- Institute of Microtechnologies, RheinMain University of Applied Sciences, 65428, Rüsselsheim, Germany
| | | |
Collapse
|
23
|
Mao M, Ke S, Tang D, Sang X, He D. Structure and Performance Optimization of Co Magnetic Thin Films Deposited by Vacuum Evaporation Coating. MATERIALS (BASEL, SWITZERLAND) 2023; 16:ma16093395. [PMID: 37176276 PMCID: PMC10179819 DOI: 10.3390/ma16093395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 04/19/2023] [Accepted: 04/20/2023] [Indexed: 05/15/2023]
Abstract
Co magnetic films are widely used in high-frequency magnetic recording and vertical magnetic recording due to their high saturation magnetization and magnetocrystalline anisotropy. In this work, ferromagnetic Co magnetic films were prepared on copper substrate by vacuum evaporation combined with heat treatment (H2 atmosphere), to investigate the impact of film thickness and annealing temperature on microstructure and magnetic properties. The results show that with the increase in annealing temperature, the Co thin film physical phase does not change significantly, the crystallinity increases, and the grain size increases, which is consistent with the results obtained from the SEM morphology map of the sample surface, leading to an increase in coercivity. By annealing experiments (atmospheric atmosphere) on Co magnetic films with and without an Al protective layer, as shown by scanning electron microscopy microscopic characterization results, it was verified that the Al layer can protect the inner Co layer from oxidation. As the film thickness increases from 10 to 300 nm, the magnetic properties of Co films change significantly. The saturation magnetization gradually increases from 0.89 to 5.21 emu/g, and the coercivity increases from 124.3 to 363.8 Oe. The remanence ratio of the 10 nm magnetic film is 0.82, which is much higher than the film remanence ratio of 0.46 at 50 nm. This is because when the thickness of the film is between 10 and 50 nm, the magnetic moments partially deviate from the in-plane direction, and the out-of-plane component reduces the film remanence ratio. This study shows that optimizing annealing temperature and film thickness can effectively control the structure and magnetic properties of Co magnetic films, which is of great significance for the development of the magnetic recording field.
Collapse
Affiliation(s)
- Mingheng Mao
- State Key Laboratory of New Materials and Composites Technology, Wuhan University of Technology, Wuhan 430070, China
| | - Shaoqiu Ke
- State Key Laboratory of New Materials and Composites Technology, Wuhan University of Technology, Wuhan 430070, China
| | - Dingguo Tang
- School of Chemistry and Materials Science, Central South University for Nationalities, Wuhan 430074, China
| | - Xiahan Sang
- State Key Laboratory of New Materials and Composites Technology, Wuhan University of Technology, Wuhan 430070, China
| | - Danqi He
- State Key Laboratory of New Materials and Composites Technology, Wuhan University of Technology, Wuhan 430070, China
| |
Collapse
|
24
|
Cuevas AL, Vega V, Domínguez A, González AS, Prida VM, Benavente J. Optical Characterization of ALD-Coated Nanoporous Alumina Structures: Effect of Sample Geometry or Coated Layer Material. MICROMACHINES 2023; 14:839. [PMID: 37421072 DOI: 10.3390/mi14040839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 03/29/2023] [Accepted: 04/01/2023] [Indexed: 07/09/2023]
Abstract
Optical characterization of nanoporous alumina-based structures (NPA-bSs), obtained by ALD deposition of a thin conformal SiO2 layer on two alumina nanosupports with different geometrical parameters (pore size and interpore distance), was performed by two noninvasive and nondestructive techniques such as spectroscopic ellipsometry (SE) and photoluminescence (Ph) spectra. SE measurements allow us to estimate the refraction index and extinction coefficient for the studied samples and their dependence with wavelength for the 250-1700 nm interval, showing the effect of sample geometry and cover-layer material (SiO2, TiO2, or Fe2O3), which significantly affect the oscillatory character of both parameters, as well as changes associated with the light incidence angle, which are attributed to surface impurities and inhomogeneity. Photoluminescence curves exhibit a similar shape independently of sample pore-size/porosity, but they seem to affect intensity values. This analysis shows the potential application of these NPA-bSs platforms to nanophotonics, optical sensing, or biosensing.
Collapse
Affiliation(s)
- Ana Laura Cuevas
- Unidad de Nanotecnología, SCBI Centro, Universidad de Málaga, E-29071 Málaga, Spain
| | - Víctor Vega
- Laboratorio de Membranas Nanoporosas, Servicicios Científico-Técnicos, Universidad de Oviedo, E-33006 Oviedo, Spain
| | - Antonia Domínguez
- Unidad de Nanotecnología, SCBI Centro, Universidad de Málaga, E-29071 Málaga, Spain
| | - Ana Silvia González
- Departmento de Física, Facultad de Ciencias, Universidad de Oviedo, E-33007 Oviedo, Spain
| | - Víctor M Prida
- Departmento de Física, Facultad de Ciencias, Universidad de Oviedo, E-33007 Oviedo, Spain
| | - Juana Benavente
- Departmento de Física Aplicada I, Facultad de Ciencias, Universidad de Málaga, E-29071 Málaga, Spain
| |
Collapse
|
25
|
AAO-Assisted Nanoporous Platinum Films for Hydrogen Sensor Application. Catalysts 2023. [DOI: 10.3390/catal13030459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023] Open
Abstract
The effects of the porosity and the thickness on the ability of hydrogen sensing is demonstrated through a comparison of compact and nanoporous platinum film sensors. The synthesis of anodic aluminum oxide (AAO) nanotubes with an average pore diameter of less than 100 nm served as the template for the fabrication of nanoporous Pt films using an anodization method. This was achieved by applying a voltage of 40 V in 0.4 M of a phosphoric acid solution at 20 °C. To compare the film and nanoporous Pt, layers of approximately 3 nm and 20 nm were coated on both glass substrates and AAO templates using a sputtering technique. FESEM images monitored the formation of nanoporosity by observing the Pt layers covering the upper edges of the AAO nanotubes. Despite their low thickness and the poor long-range order, the EDX and XRD measurements confirmed and uncovered the crystalline properties of the Pt films by comparing the bare and the Pt deposited AAO templates. The nanoporous Pt and Pt thin film sensors were tested in the hydrogen concentration range between 10–50,000 ppm H2 at room temperature, 50 °C, 100 °C and 150 °C. The results reveal that nanoporous Pt performed higher sensitivity than the Pt thin film and the surface scattering phenomenon can express the hydrogen sensing mechanism of the Pt sensors.
Collapse
|
26
|
The relationship between the growth rate of anodic TiO2 nanotubes, the fluoride concentration and the electronic current. Electrochem commun 2023. [DOI: 10.1016/j.elecom.2023.107457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
|
27
|
Białek E, Włodarski M, Norek M. Designing porous photonic crystals for MIR spectral region-a deeper insight into the anodic alumina layer thickness versus charge density relation. NANOTECHNOLOGY 2023; 34:125603. [PMID: 36595263 DOI: 10.1088/1361-6528/aca546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 11/23/2022] [Indexed: 06/17/2023]
Abstract
The mid-infrared region (MIR) is crucial for many applications in security and industry, in chemical and biomolecular sensing, since it contains strong characteristic vibrational transitions of many important molecules and gases (e.g. CO2, CH4, CO). Despite its great potential, the optical systems operating in this spectral domain are still under development. The situation is caused mainly by the lack of inexpensive and adequate optical materials which show no absorption in the MIR. In this work, we present an easy and affordable way to develop 1D photonic crystals (PCs) based on porous anodic alumina for MIR region. The porous PCs were produced by the pulse anodization of aluminum using charge-controlled mode. The first order photonic stopbands (λ1) were located within ca. 3.5-6.5μm. Annealing of the material at 1100 °C for an hour has allowed to recover the wavelength range from around 5.8 to 7.5μm owing to the decomposition of the absorption centers (oxalate anions) present in the anodic oxide framework while maintaining the PC structural stability. The spectral position and the shape of the resonances were regulated by the charge passing under high (UH) and low (UL) voltage pulses, porosity of the correspondingdHanddLsegments, and dura tion of the process (ttot). The thickness of thedHanddLlayers was proportional to the charge passing under respective pulses, with the proportionality coefficient increasing with the applied voltage. Despite the constant charge (2500 mC cm-2) applied during the anodization, the thickness of anodic alumina (d) increased with applied voltage (10-60 V) and anodizing temperature (5 °C-30 °C). This behavior was ascribed to the different kinetics of the anodic alumina formation prompted by the variable electrochemical conditions. The photonic material can be used in portable nondispersive gas sensors as an enhancement layer operating up to around 9μm.
Collapse
Affiliation(s)
- Ewelina Białek
- Institute of Materials Science and Engineering, Faculty of Advanced Technologies and Chemistry, Military University of Technology, Str. gen Sylwestra Kaliskiego 2, 00-908 Warsaw, Poland
| | - Maksymilian Włodarski
- Institute of Optoelectronics, Military University of Technology, Str. gen. Sylwestra Kaliskiego 2, 00-908 Warsaw, Poland
| | - Małgorzata Norek
- Institute of Materials Science and Engineering, Faculty of Advanced Technologies and Chemistry, Military University of Technology, Str. gen Sylwestra Kaliskiego 2, 00-908 Warsaw, Poland
| |
Collapse
|
28
|
Sacco LN, Vollebregt S. Overview of Engineering Carbon Nanomaterials Such As Carbon Nanotubes (CNTs), Carbon Nanofibers (CNFs), Graphene and Nanodiamonds and Other Carbon Allotropes inside Porous Anodic Alumina (PAA) Templates. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:260. [PMID: 36678014 PMCID: PMC9861583 DOI: 10.3390/nano13020260] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 01/05/2023] [Accepted: 01/06/2023] [Indexed: 06/17/2023]
Abstract
The fabrication and design of carbon-based hierarchical structures with tailored nano-architectures have attracted the enormous attention of the materials science community due to their exceptional chemical and physical properties. The collective control of nano-objects, in terms of their dimensionality, orientation and size, is of paramount importance to expand the implementation of carbon nanomaterials across a large variety of applications. In this context, porous anodic alumina (PAA) has become an attractive template where the pore morphologies can be straightforwardly modulated. The synthesis of diverse carbon nanomaterials can be performed using PAA templates, such as carbon nanotubes (CNTs), carbon nanofibers (CNFs), and nanodiamonds, or can act as support for other carbon allotropes such as graphene and other carbon nanoforms. However, the successful growth of carbon nanomaterials within ordered PAA templates typically requires a series of stages involving the template fabrication, nanostructure growth and finally an etching or electrode metallization steps, which all encounter different challenges towards a nanodevice fabrication. The present review article describes the advantages and challenges associated with the fabrication of carbon materials in PAA based materials and aims to give a renewed momentum to this topic within the materials science community by providing an exhaustive overview of the current synthesis approaches and the most relevant applications based on PAA/Carbon nanostructures materials. Finally, the perspective and opportunities in the field are presented.
Collapse
|
29
|
Caballero-Calero O, Ruiz-Clavijo A, Manzano CV, Martín-González M, Armelles G. Plasmon Resonances in 1D Nanowire Arrays and 3D Nanowire Networks of Topological Insulators and Metals. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 13:154. [PMID: 36616063 PMCID: PMC9823705 DOI: 10.3390/nano13010154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/19/2022] [Accepted: 12/26/2022] [Indexed: 06/17/2023]
Abstract
The 1D nanowire arrays and 3D nanowire networks of topological insulators and metals have been fabricated by template-assisted deposition of Bi2Te3 and Ni inside anodic aluminum oxide (AAO) templates, respectively. Despite the different origins of the plasmon capabilities of the two materials, the results indicate that the optical response is determined by plasmon resonances, whose position depends on the nanowire interactions and material properties. Due to the thermoelectric properties of Bi2Te3 nanowires, these plasmon resonances could be used to develop new ways of enhancing thermal gradients and their associated thermoelectric power.
Collapse
|
30
|
Cigane U, Palevicius A, Janusas G. Vibration-Assisted Synthesis of Nanoporous Anodic Aluminum Oxide (AAO) Membranes. MICROMACHINES 2022; 13:2236. [PMID: 36557536 PMCID: PMC9785690 DOI: 10.3390/mi13122236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 12/14/2022] [Accepted: 12/15/2022] [Indexed: 06/17/2023]
Abstract
In recent years, many research achievements in the field of anodic aluminum oxide (AAO) membranes can be observed. Nevertheless, it is still an interesting research topic due to its high versatility and applications in various fields, such as template-assisted methods, filtration, sensors, etc. Nowadays, miniaturization is an integral part of different technologies; therefore, research on micro- and nanosized elements is relevant in areas such as LEDs and OLEDs, solar cells, etc. To achieve an efficient mixing process of fluid flow in straight nanopores, acoustofluidic physics has attracted great interest in recent decades. Unfortunately, the renewal of the electrolyte concentration at the bottom of a pore is limited. Thus, excitation is used to improve fluid mixing along nanosized diameters. The effect of excitation by high-frequency vibrations on pore geometry is also investigated. In this study, theoretical simulations were performed. Using theoretical calculations, the acoustic pressure, acoustic velocity, and velocity magnitude were obtained at frequencies of 2, 20, and 40 kHz. Moreover, nanoporous AAO membranes were synthesized, and the influence of high-frequency vibrations on the geometry of the pores was determined. Using a high-frequency excitation of 20 kHz, the thickness of the AAO membrane increased by 17.8%. In addition, the thickness increased by 31.1% at 40 kHz and 33.3% at the resonant frequency of 40 kHz. Using high-frequency vibrations during the anodization process, the electrolyte inside the pores is mixed, and as a result, a higher oxide growth rate and a deeper structure can be achieved. On the other hand, to obtain pores of the same depth, the reaction can be performed in a shorter time.
Collapse
|
31
|
Matsuda T, Tsunoda I, Nagata M, Kawakita T, Noguchi S. Rapid change in polarization accompanying Fabry-Pérot resonance in anodic porous alumina coated with a gold thin film. APPLIED OPTICS 2022; 61:10178-10187. [PMID: 36606779 DOI: 10.1364/ao.474161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 10/27/2022] [Indexed: 06/17/2023]
Abstract
We experimentally investigate the polarization property of the specularly reflected light from an anodic porous alumina (APA) membrane coated with a gold (Au) thin film. As a result, we reveal a rapid change in the normalized Stokes parameter s 3 of the specularly reflected light around the angle of incidence θ A at which the resonance absorption of the incident light occurs. The rapid change in s 3 demonstrates that the specularly reflected light can rapidly be right- to left-elliptically polarized via linear polarization at the zero-crossing point θ Z of s 3. Moreover, θ Z is located close to θ A , and θ Z as well as θ A depend on the occurrence conditions of the resonance absorption. From numerical aspects based on the Maxwell Garnett effective medium approximation, we clarify that the rapid change in s 3 accompanies the Fabry-Pérot (FP) resonance in the Au-coated APA membrane. The numerical results also suggest that the change in the refractive index of the filling material into nanopores of the Au-coated APA membrane can be successfully estimated by using the rapid change in s 3.
Collapse
|
32
|
Thermoelectric generators as an alternative for reliable powering of wearable devices with wasted heat. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
33
|
Algarra M, López Escalante MC, Martínez de Yuso MV, Soto J, Cuevas AL, Benavente J. Nanoporous Alumina Support Covered by Imidazole Moiety-Based Ionic Liquids: Optical Characterization and Application. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12234131. [PMID: 36500754 PMCID: PMC9736403 DOI: 10.3390/nano12234131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 11/14/2022] [Accepted: 11/18/2022] [Indexed: 06/12/2023]
Abstract
This work analyzes chemical surface and optical characteristics of a commercial nanoporous alumina structure (NPAS) as a result of surface coverage by different imidazolium-based ionic liquids (1-butyl-3-metylimidazolium hexafluorophosphate, 3-methyl-1-octylimidazolium hexafluorophosphate, or 1-ethyl-3-methylimidazolium tetrafluoroborate). Optical characteristics of the IL/NPAS samples were determined by photoluminescence (at different excitation wavelengths (from 300 nm to 400 nm), ellipsometry spectroscopy, and light transmittance/reflectance measurements for a range of wavelengths that provide information on modifications related to both visible and near-infrared regions. Chemical surface characterization of the three IL/NPAS samples was performed by X-ray photoelectron spectroscopy (XPS), which indicates almost total support coverage by the ILs. The IL/NPAS analyzed samples exhibit different photoluminescence behavior, high transparency (<85%), and a reflection maximum at wavelength ~380 nm, with slight differences depending on the IL, while the refractive index values are rather similar to those shown by the ILs. Moreover, the illuminated I−V curves (under standard conditions) of the IL/NPAS samples were also measured for determining the efficiency energy conversion to estimate their possible application as solar cells. On the other hand, a computational quantum mechanical modeling method (DFT) was used to establish the most stable bond between the ILs and the NPAS support.
Collapse
Affiliation(s)
- Manuel Algarra
- INAMAT-Institute for Advanced Materials and Mathematics, Departamento de Ciencias, Universidad Pública de Navarra, Campus de Arrosadía, 31006 Pamplona, Spain
| | - Mª Cruz López Escalante
- Departamento de Ingeniería Química, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
| | - Mª Valle Martínez de Yuso
- X-ray Photoelectron Spectroscopy Lab., Central Service to Support Research Building (SCAI), University of Málaga, 29071 Málaga, Spain
| | - Juan Soto
- Departamento de Química-Física, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
| | - Ana L. Cuevas
- Unidad de Nanotecnología, Centro de Supercomputación y Bioinnovación, Servicios Centrales de Investigación, Universidad de Málaga, 29071 Málaga, Spain
| | - Juana Benavente
- Departamento de Física Aplicada I, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
| |
Collapse
|
34
|
Farmer G, Abraham J, Littler C, Syllaios AJ, Philipose U. Growth of Highly-Ordered Metal Nanoparticle Arrays in the Dimpled Pores of an Anodic Aluminum Oxide Template. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3929. [PMID: 36432214 PMCID: PMC9695744 DOI: 10.3390/nano12223929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 10/27/2022] [Accepted: 10/28/2022] [Indexed: 06/16/2023]
Abstract
A reliable, scalable, and inexpensive technology for the fabrication of ordered arrays of metal nanoparticles with large areal coverage on various substrates is presented. The nanoparticle arrays were formed on aluminum substrates using a two-step anodization process. By varying the anodization potential, the pore diameter, inter-pore spacing, and pore ordering in the anodic aluminum oxide (AAO) template were tuned. Following a chemical etch, the height of the pores in the AAO membrane were reduced to create a dimpled membrane surface. Periodic arrays of metal nanoparticles were subsequently created by evaporating metal on to the dimpled surface, allowing for individual nanoparticles to form within the dimples by a solid state de-wetting process induced by annealing. The ordered nanoparticle array could then be transferred to a substrate of choice using a polymer lift-off method. Following optimization of the experimental parameters, it was possible to obtain cm2 coverage of metal nanoparticles, like gold and indium, on silicon, quartz and sapphire substrates, with average sizes in the range of 50-90 nm. The de-wetting process was investigated for a specific geometry of the dimpled surface and the results explained for two different film thicknesses. Using a simple model, the experimental results were interpreted and supported by numerical estimations.
Collapse
|
35
|
Zhao Z, Wang S, Zhang J, Liu L, Jiang L, Xu X, Song Y. A phosphoric anion layer inhibits electronic current generation and nanotube growth during anodization of titanium. NANOSCALE ADVANCES 2022; 4:4597-4605. [PMID: 36341295 PMCID: PMC9595191 DOI: 10.1039/d2na00433j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 09/12/2022] [Indexed: 06/16/2023]
Abstract
Nowadays the formation mechanism of anodic TiO2 nanotubes has attracted extensive attention. Field-assisted dissolution (TiO2 + 6F- + 4H+ → [TiF6]2- + 2H2O) has been considered as the causal link to the formation and growth of nanotubes. But it is hard for this theory to explain three stages of the current-time curve. Here, the anodization of titanium was studied by adding different concentrations of H3PO4 (0%, 4 wt%, 6 wt%, 8 wt%, and 10 wt%) in ethylene glycol containing the same concentration of NH4F (0.5 wt%). The results prove that under the action of the same concentration of NH4F, the growth rate of nanotubes decreases obviously with the increase of H3PO4 concentration, and the second stage of the current-time curve is also prolonged simultaneously. These experimental facts cannot be interpreted by field-assisted dissolution theory and the viscous flow model. Here, an anion layer formed by H3PO4 and the electronic current theory are ably used to explain these facts reasonably for the first time.
Collapse
Affiliation(s)
- Ziyu Zhao
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Shiyi Wang
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Jiazheng Zhang
- School of Environmental and Chemical Engineering, Jiangsu Ocean University Lianyungang 222005 China
| | - Lin Liu
- School of Environmental and Chemical Engineering, Jiangsu Ocean University Lianyungang 222005 China
| | - Longfei Jiang
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Xiangyue Xu
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Ye Song
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| |
Collapse
|
36
|
Feng M, Ma S, Liu Y, Zheng Y, Feng Y, Wang H, Cheng J, Wang D. Control of triboelectrification on Al-metal surfaces through microstructural design. NANOSCALE 2022; 14:15129-15140. [PMID: 36205557 DOI: 10.1039/d2nr03445j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The instantaneous discharge of accumulated static charge due to contact electrification can cause irreversible damage to electrostatic-sensitive systems. Despite major advances in reducing tribo-charges, the problem remains intractable. Here, four alumina microstructures are fabricated on aluminum (Al) by combining chemical etching and anodic oxidation, and the effects of surface composition and structure on the triboelectric performance are studied by assembling them with a polytetrafluoroethylene membrane into a solid-solid triboelectric nanogenerator. The results show that the short-circuit current of the hierarchical nanoporous anodic aluminum oxide (micro/nano-AAO) modified Al is 8.77 times smaller than that of pristine Al, which is attributed to the reduced contact area and presence of an oxide film on the surface of the modified metal. By regulating the diameter of alumina nanotubes, a positive correlation between the contact area and the measured charge density is theoretically demonstrated, which establishes the size of the contact area as the main factor affecting triboelectric outputs. In addition, the micro/nano-AAO based phone shell could provide more effective electrostatic protection than that based on an acrylic coating. This novel regulation of the triboelectric output by microstructural design provides a new direction for the development of antistatic materials in a vacuum and non-grounded environment.
Collapse
Affiliation(s)
- Min Feng
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
- Center of Materials Sciences and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Shaochen Ma
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
- Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
| | - Ying Liu
- Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
| | - Youbin Zheng
- Qingdao Center of Resource Chemistry and New Materials, Qingdao 266100, China
| | - Yange Feng
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
- Qingdao Center of Resource Chemistry and New Materials, Qingdao 266100, China
| | - Hanchao Wang
- Qingdao Center of Resource Chemistry and New Materials, Qingdao 266100, China
| | - Jiahui Cheng
- Qingdao Center of Resource Chemistry and New Materials, Qingdao 266100, China
| | - Daoai Wang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
- Qingdao Center of Resource Chemistry and New Materials, Qingdao 266100, China
| |
Collapse
|
37
|
Chernyakova K, Klimas V, Jagminas A, Lushpa N, Vrublevsky I, Jankauskas S. Features of the porous morphology of anodic alumina films at the initial stage of disordered growth. Electrochem commun 2022. [DOI: 10.1016/j.elecom.2022.107391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
|
38
|
Salaheldeen M, Nafady A, Abu-Dief AM, Díaz Crespo R, Fernández-García MP, Andrés JP, López Antón R, Blanco JA, Álvarez-Alonso P. Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole Size. NANOMATERIALS 2022; 12:nano12152544. [PMID: 35893512 PMCID: PMC9332129 DOI: 10.3390/nano12152544] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 07/14/2022] [Accepted: 07/21/2022] [Indexed: 02/04/2023]
Abstract
The interest in magnetic nanostructures exhibiting perpendicular magnetic anisotropy and exchange bias (EB) effect has increased in recent years owing to their applications in a new generation of spintronic devices that combine several functionalities. We present a nanofabrication process used to induce a significant out-of-plane component of the magnetic easy axis and EB. In this study, 30 nm thick CoO/Co multilayers were deposited on nanostructured alumina templates with a broad range of pore diameters, 34 nm ≤ Dp ≤ 96 nm, maintaining the hexagonal lattice parameter at 107 nm. Increase of the exchange bias field (HEB) and the coercivity (HC) (12 times and 27 times, respectively) was observed in the nanostructured films compared to the non-patterned film. The marked dependence of HEB and HC with antidot hole diameters pinpoints an in-plane to out-of-plane changeover of the magnetic anisotropy at a nanohole diameter of ∼75 nm. Micromagnetic simulation shows the existence of antiferromagnetic layers that generate an exceptional magnetic configuration around the holes, named as antivortex-state. This configuration induces extra high-energy superdomain walls for edge-to-edge distance >27 nm and high-energy stripe magnetic domains below 27 nm, which could play an important role in the change of the magnetic easy axis towards the perpendicular direction.
Collapse
Affiliation(s)
- Mohamed Salaheldeen
- Physics Department, Faculty of Science, Sohag University, Sohag 82524, Egypt
- Departamento de Física, Universidad de Oviedo, C/Federico García Lorca 18, 33007 Oviedo, Spain; (R.D.C.); (M.P.F.-G.); (J.A.B.)
- Departamento de Física Aplicada, EIG, Universidad del País Vasco, UPV/EHU, 20018 San Sebastián, Spain
- Correspondence: (M.S.); (P.Á.-A.)
| | - Ayman Nafady
- Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;
| | - Ahmed M. Abu-Dief
- Chemistry Department, Faculty of Science, Sohag University, Sohag 82524, Egypt;
| | - Rosario Díaz Crespo
- Departamento de Física, Universidad de Oviedo, C/Federico García Lorca 18, 33007 Oviedo, Spain; (R.D.C.); (M.P.F.-G.); (J.A.B.)
| | - María Paz Fernández-García
- Departamento de Física, Universidad de Oviedo, C/Federico García Lorca 18, 33007 Oviedo, Spain; (R.D.C.); (M.P.F.-G.); (J.A.B.)
| | - Juan Pedro Andrés
- Instituto Regional de Investigación Científica Aplicada (IRICA), Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain; (J.P.A.); (R.L.A.)
- Departamento de Física Aplicada, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Ricardo López Antón
- Instituto Regional de Investigación Científica Aplicada (IRICA), Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain; (J.P.A.); (R.L.A.)
- Departamento de Física Aplicada, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Jesús A. Blanco
- Departamento de Física, Universidad de Oviedo, C/Federico García Lorca 18, 33007 Oviedo, Spain; (R.D.C.); (M.P.F.-G.); (J.A.B.)
| | - Pablo Álvarez-Alonso
- Departamento de Física, Universidad de Oviedo, C/Federico García Lorca 18, 33007 Oviedo, Spain; (R.D.C.); (M.P.F.-G.); (J.A.B.)
- Instituto Universitario de Tecnología Industrial de Asturias, Universidad de Oviedo, 33203 Gijón, Spain
- Correspondence: (M.S.); (P.Á.-A.)
| |
Collapse
|
39
|
Yazlak M, Khan QA, Steinhart M, Duran H. Melting Temperature Depression and Phase Transitions of Nitrate-Based Molten Salts in Nanoconfinement. ACS OMEGA 2022; 7:24669-24678. [PMID: 35874251 PMCID: PMC9301948 DOI: 10.1021/acsomega.2c02536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Hybrids of nitrate-based molten salts (KNO3, NaNO3, and Solar Salt) and anodic aluminum oxide (AAO) with various pore sizes (between 25 and 380 nm) were designed for concentrated solar power (CSP) plants to achieve low melting point (<200 °C) and high thermal conductivity (>1 W m-1 K-1). AAO pore surfaces were passivated with octadecyl phosphonic acid (ODPA), and the results were compared with as-anodized AAO. The change in phase transition temperatures and melting temperatures of salts was investigated as a function of pore diameter. Melting temperatures decreased for all salts inside AAO with different pore sizes while the highest melting temperature decrease (ΔT = 173 ± 2 °C) was observed for KNO3 filled in AAO with a pore diameter of 380 nm. Another nanoconfinement effect was observed in the crystal phases of the salts. The ferroelectric phase of KNO3 (γ-phase) formed at room temperature for KNO3/AAO hybrids with pore size larger than 35 nm. Thermal conductivity values of molten salt (MS)/AAO hybrids were obtained by thermal property analysis (TPS) at room temperature and above melting temperatures of the salts. The highest increase in thermal conductivity was observed as 73% for KNO3/AAO-35 nm. For NaNO3/AAO-380 nm hybrids, the thermal conductivity coefficient was 1.224 ± 0.019 at room temperature. To determine the capacity and efficiency of MS/AAO hybrids during the heat transfer process, the energy storage density per unit volume (J m-3) was calculated. The highest energy storage capacity was calculated as 2390 MJ m-3 for KNO3/AAO with a pore diameter of 400 nm. This value is approximately five times higher than that of bulk salt.
Collapse
Affiliation(s)
- Mustafa
Göktürk Yazlak
- Department
of Materials Science and Nanotechnology Engineering, TOBB University of Economics and Technology, Söğütözü
Cad. 43, 06560 Ankara, Turkey
| | - Qaiser Ali Khan
- Institut
für Chemie Neuer Materialien, Universitat
Osnabrück, D-49069 Osnabrück, Germany
| | - Martin Steinhart
- Institut
für Chemie Neuer Materialien, Universitat
Osnabrück, D-49069 Osnabrück, Germany
| | - Hatice Duran
- Department
of Materials Science and Nanotechnology Engineering, TOBB University of Economics and Technology, Söğütözü
Cad. 43, 06560 Ankara, Turkey
- UNAM
Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey
| |
Collapse
|
40
|
The Interrelation of Synthesis Conditions and Wettability Properties of the Porous Anodic Alumina Membranes. NANOMATERIALS 2022; 12:nano12142382. [PMID: 35889606 PMCID: PMC9320104 DOI: 10.3390/nano12142382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 07/09/2022] [Accepted: 07/11/2022] [Indexed: 01/01/2023]
Abstract
The results of studies on the wettability properties and preparation of porous anodic alumina (PAA) membranes with a 3.3 ± 0.2 μm thickness and a variety of pore sizes are presented in this article. The wettability feature results, as well as the fabrication processing characteristics and morphology, are presented. The microstructure effect of these surfaces on wettability properties is analyzed in comparison to outer PAA surfaces. The interfacial contact angle was measured for amorphous PAA membranes as-fabricated and after a modification technique (pore widening), with pore sizes ranging from 20 to 130 nm. Different surface morphologies of such alumina can be obtained by adjusting synthesis conditions, which allows the surface properties to change from hydrophilic (contact angle is approximately 13°) to hydrophobic (contact angle is 100°). This research could propose a new method for designing functional surfaces with tunable wettability. The potential applications of ordinary alumina as multifunctional films are demonstrated.
Collapse
|
41
|
Zhang J, Zhao H, Gong M, Zhang L, Yan Z, Xie K, Fei G, Zhu X, Kong M, Zhang S, Zhang L, Lei Y. Revealing the truncated conical geometry of nanochannels in anodic aluminium oxide membranes. NANOSCALE 2022; 14:5356-5368. [PMID: 35293409 DOI: 10.1039/d2nr01006b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Anodic aluminium oxide (AAO) membranes with self-ordered nanochannels have become promising candidates for applications in the aspects such as structural coloration, photonic crystals, upconversion luminescence and nanofluidic transport. Also, self-ordered AAO membranes have been extensively used for the fabrication of functional nanostructures such as nanowires, nanotubes, nanoparticles, nanorods and nanopillars. Geometries of nanochannels are crucial for the applications of AAO membranes as well as controlling growth (e.g., nucleation, direction and morphology) and in applications (e.g., optics, magnetics, thermoelectrics, biology, medicine, sensing, and energy conversion and storage) of the functional nanostructures fabricated via AAO template-based methods. However, observation of whole nanochannels with nanometer-resolution in thick AAO membranes remains a fundamental challenge, and the nanochannel geometry has not yet been sufficiently elucidated. Here, for the first time, we use depth-profiling transmission electron microscopy to reveal the truncated conical geometry of whole nanochannels of 70 μm in length. Such shape nonuniformity of the nanochannels leads to different reflectance properties of the different depths of the nanochannels along their long axis for one AAO membrane, which suggests that the nonuniformity result in some effects on applications of the nanostructures. Furthermore, we introduce a shape factor to evaluate the shape nonuniformity and demonstrate that the nonuniformity can be remarkably removed by an effective etching method based on a temperature gradient regime.
Collapse
Affiliation(s)
- Junxi Zhang
- School of Instrument Science and Opto-electronics Engineering, Anhui Key Laboratory of Advanced Functional Materials and Devices, and Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, Hefei University of Technology, Hefei 230009, China.
| | - Huaping Zhao
- Institute of Physics & IMN MacroNano, Ilmenau University of Technology, Ilmenau 98693, Germany.
| | - Ming Gong
- Laboratory of Engineering and Material Science, University of Science and Technology of China, Hefei 230027, China
| | - Lide Zhang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Zhijun Yan
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Kang Xie
- School of Opto-Electronic Engineering, Zaozhuang University, Zaozhuang 277160, Shandong, China
| | - Guangtao Fei
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Xiaoguang Zhu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Mingguang Kong
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Shuyuan Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China
| | - Lin Zhang
- Aston Institute of Photonic Technologies, School of Engineering & Applied Science, Aston University, Birmingham B4 7ET, UK
| | - Yong Lei
- Institute of Physics & IMN MacroNano, Ilmenau University of Technology, Ilmenau 98693, Germany.
| |
Collapse
|
42
|
Zhou D, Wu B, Yang W, Li X, Zhu L, Xu Z, Wan L. Effect of polar groups of polystyrenes on the
self‐assembly
of breath figure arrays. JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1002/pol.20210939] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Di Zhou
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering Zhejiang University Hangzhou China
| | - Bai‐Heng Wu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering Zhejiang University Hangzhou China
| | - Wen‐Wu Yang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering Zhejiang University Hangzhou China
| | - Xiao Li
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering Zhejiang University Hangzhou China
| | - Liang‐Wei Zhu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering Zhejiang University Hangzhou China
| | - Zhi‐Kang Xu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering Zhejiang University Hangzhou China
| | - Ling‐Shu Wan
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, MOE Engineering Research Center of Membrane and Water Treatment Technology, and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering Zhejiang University Hangzhou China
| |
Collapse
|
43
|
Fu S, Zhang W, Wu Y, Tian J, Liu Q, Gu J, Song F, Osotsi MI, Zhang D. Bioinspired Porous Anodic Alumina/Aluminum Flake Powder for Multiband Compatible Low Detectability. ACS APPLIED MATERIALS & INTERFACES 2022; 14:8464-8472. [PMID: 35119282 DOI: 10.1021/acsami.1c23879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Continuous development and advancement in modern detection technologies have increased the demand for multiband (e.g., visual and infrared) compatible camouflage. However, challenges exist in the requirements of incompatible structure resulting from the adaptation to different camouflage effects. This study is inspired by the light absorption structure of butterfly wing scales and demonstrates a porous anodic alumina/aluminum flake powder material prepared by a microscopic powder anodic oxidation technique for visual and infrared camouflage. The fabricated structures manipulate a compromise condition for visual camouflage by low reflectance (R̅400-800nm = 0.32) and dual-band infrared camouflage by low emission (ε̅3-5μm = 0.081 and ε̅8-14μm = 0.085). Further, the characteristic of short-range disorder in these bioinspired structures allows maintenance of the camouflage performance under omnidirectional detection (0-60°). This study provides new insight and a feasible method for coordinated manipulation of electromagnetic waves via bioinspired structural design and improved fabrication.
Collapse
Affiliation(s)
- Siqi Fu
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Wang Zhang
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Yu Wu
- Research Institute of Chemical Defense, Academy of Military Sciences PLA China, Beijing 102205, P. R. China
| | - Junlong Tian
- Hunan Key Laboratory of Micro-Nano Energy Materials and Devices, Laboratory for Quantum Engineering and Micro-Nano Energy Technology, School of Physics and Optoelectronics, Xiangtan University, Xiangtan, Hunan 411105, P. R. China
| | - Qinglei Liu
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Jiajun Gu
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Fang Song
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Maurice I Osotsi
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Di Zhang
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| |
Collapse
|
44
|
Symmetrically Controlled Design of Twin Alumina-Co Composite Thin Films. COATINGS 2022. [DOI: 10.3390/coatings12020223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Self-assembled dual-working electrode electrolytic cells were designed to produce twin alumina-Co composite films with highly symmetrical microstructures using a deflected electric field-assisted alternating current electrodeposition method. The results show that the deposition current density, microstructure, and optical and magnetic properties of the twin composite films exhibit a high degree of symmetry. The distribution of magnetic Co particles in the alumina nanopores can be changed by adjusting the magnitude of the deflected electric field, resulting in a synchronous symmetrical change in the microstructure of the composite films, which enables the fine-tuning of the magneto-optical properties of the twin alumina-Co composite films at the microscopic scale. The current density distribution on the surface of the twin composite films along the direction of the deflected electric field was quantitatively analyzed by theoretical calculations and numerical simulations. The results show that the deposition current density gradually increases from 0.024 A/m2 in region C to 0.056 A/m2 in region A at 6 V deflection voltage. The saturation magnetization intensity gradually increases along the radial direction, which is 118, 130, and 150 kA/m, respectively
Collapse
|
45
|
Anis SF, Lalia BS, Hashaikeh R, Hilal N. Titanium coating on ultrafiltration inorganic membranes for fouling control. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.119997] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
|
46
|
Jiang L, Zhang J, Chen B, Zhang S, Zhang Z, Wan W, Song Y. Morphological comparison and growth mechanism of TiO2 nanotubes in HBF4 and NH4F electrolytes. Electrochem commun 2022. [DOI: 10.1016/j.elecom.2022.107200] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
|
47
|
Li X, Zhang Y, Gao L, Ma J, Qiu Y, Xu X, Ou J, Ma W. The growth rate of nanotubes and the quantity of charge during anodization. Electrochem commun 2022. [DOI: 10.1016/j.elecom.2021.107184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
|
48
|
Li C, Ni Y, Gong J, Song Y, Gong T, Zhu X. A review: research progress on the formation mechanism of porous anodic oxides. NANOSCALE ADVANCES 2022; 4:322-333. [PMID: 36132683 PMCID: PMC9417932 DOI: 10.1039/d1na00624j] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Accepted: 11/19/2021] [Indexed: 06/16/2023]
Abstract
Owing to the great development potential of porous anodic oxides (PAO) in many fields, research on their formation mechanisms, fabrication processes and applications has a history of more than ten years. Although compared with research on the fabrication processes and applications of PAO, research on their formation mechanisms started late, several mainstream theories have been formed in the academic community, including the field-assisted dissolution (FAD) theory, the field-assisted ejection (FAE) theory, the self-organization theory, the ionic and electronic current theory and the oxygen bubble mould effect. This review will focus on summarizing the core views of the mainstream mechanisms mentioned above and comparing the explanations for some of their classical experimental phenomena.
Collapse
Affiliation(s)
- Chengyuan Li
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Yilin Ni
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Jingjing Gong
- School of Design Art and Media, Nanjing University of Science and Technology Nanjing 210094 China
| | - Ye Song
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Tianle Gong
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Xufei Zhu
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| |
Collapse
|
49
|
Li P, Wang H, Ni Y, Song Y, Sun M, Gong T, Li C, Zhu X. Unraveling the six stages of the current-time curve and the bilayer nanotubes obtained by one-step anodization of Zr. NANOSCALE ADVANCES 2022; 4:582-589. [PMID: 36132686 PMCID: PMC9419485 DOI: 10.1039/d1na00692d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Accepted: 12/05/2021] [Indexed: 06/16/2023]
Abstract
The application and growth mechanism of anodic TiO2 nanotubes have been a hot topic in the last ten years, but the formation mechanism of anodic ZrO2 nanotubes has rarely been studied. In one-step constant voltage anodization of Al and Ti, the typical current-time curve has three stages. Moreover, the current-time curves of the three stages can last for 10 min or even 10 hours, resulting in a single layer of nanotubes with the same diameter due to the constant voltage in one-step anodization. However, in this paper, it was found for the first time that the three stages of the current-time curve appeared twice in succession during one-step constant voltage anodization of Zr for only 900 seconds, and bilayer nanotubes with increased diameter were obtained. This six-stage current-time curve cannot be explained by classical field-assisted dissolution and field-assisted flow or stress-driven mechanisms. Here, the formation mechanism and growth kinetics of bilayer ZrO2 nanotubes have been clarified rationally by the theories of ionic current, electronic current and oxygen bubble mold. The interesting results presented in this paper are of great significance for revealing the anodizing process of various metals and the formation mechanism of porous structures.
Collapse
Affiliation(s)
- Pengze Li
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Heng Wang
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Yilin Ni
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Ye Song
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Ming Sun
- School of Electronic and Optical Engineering, Nanjing University of Science and Technology Nanjing 210094 China
| | - Tianle Gong
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Chengyuan Li
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| | - Xufei Zhu
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology Nanjing 210094 China
| |
Collapse
|
50
|
Anodic Alumina Membranes: From Electrochemical Growth to Use as Template for Fabrication of Nanostructured Electrodes. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12020869] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The great success of anodic alumina membranes is due to their morphological features coupled to both thermal and chemical stability. The electrochemical fabrication allows accurate control of the porous structure: in fact, the membrane morphological characteristics (pore length, pore diameter and cell density) can be controlled by adjusting the anodizing parameters (bath, temperature, voltage and time). This article deals with both the fabrication and use of anodic alumina membranes. In particular, we will show the specific role of the addition of aluminum ions to phosphoric acid-based anodizing solution in modifying the morphology of anodic alumina membranes. Anodic alumina membranes were obtained at −1 °C in aqueous solutions of 0.4 M H3PO4 added with different amounts of Al(OH)3. For sake of completeness, the formation of PAA in pure 0.4 M H3PO4 in otherwise identical conditions was also investigated. We found that the presence of Al(OH)3 in solution highly affects the morphology of the porous layer. In particular, at high Al(OH)3 concentration (close to saturation) more compact porous layers were formed with narrow pores separated by thick oxide. The increase in the electric charge from 20 to 160 C cm−2 also contributes to modifying the morphology of porous oxide. The obtained anodic alumina membranes were used as a template to fabricate a regular array of PdCo alloy nanowires that is a valid alternative to Pt for hydrogen evolution reaction. The PdCo alloy was obtained by electrodeposition and we found that the composition of the nanowires depends on the concentration of two metals in the deposition solution.
Collapse
|