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Manna G, Zinn T, Sharpnack L, Narayanan T. Orientational ordering and assembly of silica-nickel Janus particles in a magnetic field. IUCRJ 2024; 11:109-119. [PMID: 38099813 PMCID: PMC10833383 DOI: 10.1107/s205225252301000x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 11/16/2023] [Indexed: 01/10/2024]
Abstract
The orientation ordering and assembly behavior of silica-nickel Janus particles in a static external magnetic field were probed by ultra small-angle X-ray scattering (USAXS). Even in a weak applied field, the net magnetic moments of the individual particles aligned in the direction of the field, as indicated by the anisotropy in the recorded USAXS patterns. X-ray photon correlation spectroscopy (XPCS) measurements on these suspensions revealed that the corresponding particle dynamics are primarily Brownian diffusion [Zinn, Sharpnack & Narayanan (2023). Soft Matter, 19, 2311-2318]. At higher fields, the magnetic forces led to chain-like configurations of particles, as indicated by an additional feature in the USAXS pattern. A theoretical framework is provided for the quantitative interpretation of the observed anisotropic scattering diagrams and the corresponding degree of orientation. No anisotropy was detected when the magnetic field was applied along the beam direction, which is also replicated by the model. The method presented here could be useful for the interpretation of oriented scattering patterns from a wide variety of particulate systems. The combination of USAXS and XPCS is a powerful approach for investigating asymmetric colloidal particles in external fields.
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Affiliation(s)
| | - Thomas Zinn
- ESRF – The European Synchrotron, 38043 Grenoble, France
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2
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Liu Y, Huixiang Ang E, Zhong X, Lu H, Yang J, Gao F, Yu C, Zhu J, Zhu C, Zhou Y, Yang F, Yuan E, Yuan A. Oxygen vacancy modulation in interfacial engineering Fe 3O 4 over carbon nanofiber boosting ambient electrocatalytic N 2 reduction. J Colloid Interface Sci 2023; 652:418-428. [PMID: 37604053 DOI: 10.1016/j.jcis.2023.08.106] [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: 06/16/2023] [Revised: 08/14/2023] [Accepted: 08/16/2023] [Indexed: 08/23/2023]
Abstract
The oxygen vacancy modulation of interface-engineered Fe3O4 nanograins over carbon nanofiber (Fe@CNF) was achieved to improve electrocatalytic nitrogen reduction reaction (NRR) activity and stability via facile electrospinning and tuning thermal procedure. The optimal catalyst calcined at 800 ℃ (Fe@CNF-800) was endowed with abundant nanograin boundaries and optimized oxygen vacancy (Vo) concentration of iron oxides, thereby affording 37.1 μg h-1 mgcat.-1 (-0.2 V vs. reversible hydrogen electrode (RHE)) NH3 yield and rational Faraday efficiency (10.2%), with 13.6 times atomic activity enhancement compared to of that commercial Fe3O4. The interfacial effect of assembled nanograins in particles correlated with the formation of Vo and more intrinsic active sites, which is conducive to the trapping and activation of nitrogen (N2). The in-situ X-ray photoelectron spectroscopy (XPS) measurement revealed the real consumption of adsorbed oxygen when introducing N2 by the trapping effect of Vo. Density-Functional-Theory (DFT) calculation validates the promotive hydrogenation effect and elimination of hydrogen intermediate (H*) interacted with N2 transferring toward oxygen of the support. The optimal catalyst shows a lasting NRR activity at least 90 h, outperforming most reported Fe-based NRR catalysts.
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Affiliation(s)
- Yang Liu
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China
| | - Edison Huixiang Ang
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore 637616, Singapore
| | - Xiu Zhong
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China
| | - Hao Lu
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China
| | - Jun Yang
- School of Material Science & Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China
| | - Fei Gao
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China
| | - Chao Yu
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China
| | - Jiawei Zhu
- Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
| | - Chengzhang Zhu
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Yu Zhou
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Fu Yang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China.
| | - Enxian Yuan
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| | - Aihua Yuan
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China
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Zinn T, Sharpnack L, Narayanan T. Dynamics of magnetic Janus colloids studied by ultra small-angle X-ray photon correlation spectroscopy. SOFT MATTER 2023; 19:2311-2318. [PMID: 36415911 DOI: 10.1039/d2sm01334g] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The orientation behavior and the translational dynamics of spherical magnetic silica-nickel Janus colloids in an external magnetic field have been studied by small-angle X-ray scattering and X-ray photon correlation spectroscopy at ultra small-angles. For weak applied fields and at low volume fractions, the particle dynamics is dominated by Brownian motion even though the net magnetic moments of the individual particles are aligned in the direction of the field as indicated by the anisotropy in the small-angle scattering patterns. For higher fields the magnetic forces result in more complex structural changes with nickel caps of Janus particles pointing predominantly along the applied magnetic field. The alignment ultimately leads to chain-like configurations and the intensity-intensity autocorrelation functions, g2(q,t), show a second slower decay which becomes more pronounced at higher volume fractions. A direction dependent analysis of g2(q,t) revealed a faster than exponential decay perpendicular to the field which is related to the sedimentation of magnetically ordered domains. The corresponding velocity fluctuations could be decoupled from the diffusion of particles by decomposing g2(q,t) into advective and diffusive contributions. Finally, the particle dynamics becomes anisotropic at higher volume fractions and strong magnetic fields. The derived translational diffusion coefficients indicate slower particle dynamics perpendicular to the field as compared to the parallel direction.
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Affiliation(s)
- Thomas Zinn
- The European Synchrotron, 38043 Grenoble, France.
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Hasan MJ, Westphal E, Chen P, Saini A, Chu IW, Watzman SJ, Ureña-Benavides E, Vasquez ES. Adsorptive properties and on-demand magnetic response of lignin@Fe 3O 4 nanoparticles at castor oil-water interfaces. RSC Adv 2023; 13:2768-2779. [PMID: 36756408 PMCID: PMC9850361 DOI: 10.1039/d2ra07952f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 01/09/2023] [Indexed: 01/20/2023] Open
Abstract
Lignin@Fe3O4 nanoparticles adsorb at oil-water interfaces, form Pickering emulsions, induce on-demand magnetic responses to break emulsions, and can sequester oil from water. Lignin@Fe3O4 nanoparticles were prepared using a pH-induced precipitation method and were fully characterized. These were used to prepare Pickering emulsions with castor oil/Sudan red G dye and water at various oil/water volume ratios and nanoparticle concentrations. The stability and demulsification of the emulsions under different magnetic fields generated with permanent magnets (0-540 mT) were investigated using microscopy images and by visual inspection over time. The results showed that the Pickering emulsions were more stable at the castor oil/water ratio of 50/50 and above. Increasing the concentration of lignin@Fe3O4 improved the emulsion stability and demulsification rates with 540 mT applied magnetic field strength. The adsorption of lignin@Fe3O4 nanoparticles at the oil/water interface using 1-pentanol evaporation through Marangoni effects was demonstrated, and magnetic manipulation of a lignin@Fe3O4 stabilized castor oil spill in water was shown. Nanoparticle concentration and applied magnetic field strengths were analyzed for the recovery of spilled oil from water; it was observed that increasing the magnetic strength increased oil spill motion for a lignin@Fe3O4 concentration of up to 0.8 mg mL-1 at 540 mT. Overall, this study demonstrates the potential of lignin-magnetite nanocomposites for rapid on-demand magnetic responses to externally induced stimuli.
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Affiliation(s)
- Mohammad Jahid Hasan
- Department of Biomedical Engineering and Chemical Engineering, The University of Texas at San AntonioOne UTSA CircleSan Antonio78249TXUSA
| | - Emily Westphal
- Department of Chemical and Materials Engineering, University of Dayton, 300 College Park Dayton OH 45469-0256 USA
| | - Peng Chen
- Department of Chemical and Materials Engineering, University of Dayton, 300 College Park Dayton OH 45469-0256 USA
| | - Abhishek Saini
- Department of Mechanical and Materials Engineering, University of Cincinnati2901Woodside DriveCincinnatiOH45221USA
| | - I-Wei Chu
- Institute of Imaging and Analytical Technology, Mississippi State UniversityMississippi StateMS39762USA
| | - Sarah J. Watzman
- Department of Mechanical and Materials Engineering, University of Cincinnati2901Woodside DriveCincinnatiOH45221USA
| | - Esteban Ureña-Benavides
- Department of Biomedical Engineering and Chemical Engineering, The University of Texas at San AntonioOne UTSA CircleSan Antonio78249TXUSA
| | - Erick S. Vasquez
- Department of Chemical and Materials Engineering, University of Dayton, 300 College ParkDaytonOH45469-0256USA,Integrative Science and Engineering Center, University of Dayton, 300 College ParkDaytonOH45469USA
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Size-Controllable Synthesis of Monodisperse Magnetite Microparticles Leading to Magnetically Tunable Colloidal Crystals. MATERIALS 2022; 15:ma15144943. [PMID: 35888408 PMCID: PMC9323182 DOI: 10.3390/ma15144943] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 06/29/2022] [Accepted: 06/29/2022] [Indexed: 02/01/2023]
Abstract
Colloidal crystals (CCs) are periodic arrays of monodisperse microparticles. Such CCs are very attractive as they can be potentially applicable as versatile photonic devices such as reflective displays, sensors, lasers, and so forth. In this article, we describe a promising methodology for synthesizing monodisperse magnetite microparticles whose diameters are controllable in the range of 100–200 nm only by adjusting the base concentration of the reaction solution. Moreover, monodisperse magnetite microparticles in aqueous suspensions spontaneously form the CC structures under an external magnetic field, leading to the appearance of Bragg reflection colors. The reflection peak can be blue-shifted from 730 nm to 570 nm by the increase in the external magnetic field from 28 mT to 220 mT. Moreover, the reflection properties of CCs in suspension depend on the microparticle concentration in suspension and the diameter of the magnetite microparticles. Both fine-control of microparticle diameter and investigation of magneto-optical properties of CCs would contribute to the technological developments in full-color reflective displays and sensors by utilizing these monodisperse magnetite microparticles.
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Wang Y, Zhang Y, Guan Y, Zhang Y. Magnetic Field-Assisted Fast Assembly of Microgel Colloidal Crystals. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6057-6065. [PMID: 35502583 DOI: 10.1021/acs.langmuir.2c00297] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Compared with the colloidal crystals (CCs) of hard spheres, large-scale, high-quality CCs of soft microgel spheres are easier to be assembled because they are more tolerant to defects. However, to assemble microgel CCs, a microgel dispersion should first be concentrated and then allowed to crystallize, which is tedious and time-consuming. Herein, we demonstrated that a magnetic poly(N-isopropylacrylamide) (PNIPAM) microgel with an Fe3O4 core and a PNIPAM shell can be assembled into CCs quickly by simply applying an external magnetic field to the diluted microgel dispersions. The resulting CCs are highly ordered as revealed by their iridescent color, laser diffraction pattern, and confocal characterization. They display a sharp Bragg peak on their reflection spectra, which shifts to lower wavelength when heated because of the thermosensitivity of the PNIPAM shell. The magnetic assembly is not only simple and fast but also allows control of the CC structure in both horizontal and vertical directions. Using spatially varying magnetic fields, patterned microgel CCs were facilely assembled. More importantly, magnetic microgel spheres with different sizes can be assembled in a layer-by-layer manner by adding them sequentially, and the thickness of each layer can be simply controlled by the amount of spheres added.
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Affiliation(s)
- Yafei Wang
- Key Laboratory of Functional Polymer Materials and State Key Laboratory of Medicinal Chemical Biology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Yan Zhang
- Key Laboratory of Functional Polymer Materials and State Key Laboratory of Medicinal Chemical Biology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Ying Guan
- Key Laboratory of Functional Polymer Materials and State Key Laboratory of Medicinal Chemical Biology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Yongjun Zhang
- Key Laboratory of Functional Polymer Materials and State Key Laboratory of Medicinal Chemical Biology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
- School of Chemistry, Tiangong University, Tianjin 300387, China
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7
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Kamal MA, Petukhov AV, Pal A. Path-Dependent Self-Assembly of Magnetic Anisotropic Colloidal Peanuts. J Phys Chem B 2020; 124:5754-5760. [PMID: 32515962 PMCID: PMC7363168 DOI: 10.1021/acs.jpcb.0c03771] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 06/09/2020] [Indexed: 11/30/2022]
Abstract
Here we present the field induced self-assembly of anisotropic colloidal particles whose shape resembles peanuts. Being made up of hematite core and silica shell, these particles align in a direction perpendicular to the applied external magnetic field. Using small-angle X-ray scattering with microradian resolution (μrad-SAXS) in sedimented samples, we have found that one can tune the self-assembled structures by changing the time of application of the external field. If the field is applied after the sedimentation, the self-assembled structure is a nematic one, while dipolar chains are formed if the field is applied during the sedimentation process. Interestingly, within each chain particles form a smectic phase with defects. Further, these aforementioned nematic and smectic phases are of oblate type in spite of the prolate shape of the individual particles. For dipolar chains, an unusual diffraction peak shape has been observed with highly anisotropic tails in the transverse direction (perpendicular to the external field). The peak shape can be rationalized by considering the fact that the dipolar chains can act as a building block aligned along the field direction to form a para-nematic phase.
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Affiliation(s)
- Md. Arif Kamal
- Centre
Interdisciplinaire de Nanoscience de Marseille (CINaM), CNRS, Aix-Marseille University, 13007 Marseille, France
| | - Andrei V. Petukhov
- Van’t
Hoff Laboratory for Physical and Colloid Chemistry, Utrecht University, 3512 JE Utrecht, The Netherlands
| | - Antara Pal
- Division
of Physical Chemistry, Department of Chemistry, Lund University, 22100 Lund, Sweden
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Daffé N, Zečević J, Trohidou KN, Sikora M, Rovezzi M, Carvallo C, Vasilakaki M, Neveu S, Meeldijk JD, Bouldi N, Gavrilov V, Guyodo Y, Choueikani F, Dupuis V, Taverna D, Sainctavit P, Juhin A. Bad neighbour, good neighbour: how magnetic dipole interactions between soft and hard ferrimagnetic nanoparticles affect macroscopic magnetic properties in ferrofluids. NANOSCALE 2020; 12:11222-11231. [PMID: 32412032 DOI: 10.1039/d0nr02023k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Fluids responding to magnetic fields (ferrofluids) offer a scene with no equivalent in nature to explore long-range magnetic dipole interactions. Here, we studied the very original class of binary ferrofluids, embedding soft and hard ferrimagnetic nanoparticles. We used a combination of X-ray magnetic spectroscopy measurements supported by multi-scale experimental techniques and Monte-Carlo simulations to unveil the origin of the emergent macroscopic magnetic properties of the binary mixture. We found that the association of soft and hard magnetic nanoparticles in the fluid has a considerable influence on their inherent magnetic properties. While the ferrofluid remains in a single phase, magnetic interactions at the nanoscale between both types of particles induce a modification of their respective coercive fields. By connecting the microscopic properties of binary ferrofluids containing small particles, our findings lay the groundwork for the manipulation of magnetic interactions between particles at the nanometer scale in magnetic liquids.
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Affiliation(s)
- Niéli Daffé
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS, MNHN, UMR7590, 4 place Jussieu, 75052 Paris Cedex 05, France. and Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin - BP48, 91192 Gif-sur-Yvette, France and Laboratoire de Physicochimie des Electrolytes et Nanosystèmes Interfaciaux (PHENIX), Sorbonne Université, CNRS, F-75005 Paris, France
| | - Jovana Zečević
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Kalliopi N Trohidou
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 153 10 Aghia Paraskevi, Attiki, Greece
| | - Marcin Sikora
- AGH University of Science and Technology, Academic Centre for Materials and Nanotechnology, Al. Mickiewicza 30, 30-059 Krakow, Poland
| | - Mauro Rovezzi
- Université Grenoble Alpes, CNRS, Institut de Recherche pour le Développement, Irstea, Météo France, OSUG, FAME, 38000 Grenoble, France
| | - Claire Carvallo
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS, MNHN, UMR7590, 4 place Jussieu, 75052 Paris Cedex 05, France.
| | - Marianna Vasilakaki
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 153 10 Aghia Paraskevi, Attiki, Greece
| | - Sophie Neveu
- Laboratoire de Physicochimie des Electrolytes et Nanosystèmes Interfaciaux (PHENIX), Sorbonne Université, CNRS, F-75005 Paris, France
| | - Johannes D Meeldijk
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Nadejda Bouldi
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS, MNHN, UMR7590, 4 place Jussieu, 75052 Paris Cedex 05, France. and Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin - BP48, 91192 Gif-sur-Yvette, France
| | - Véronica Gavrilov
- Laboratoire de Physicochimie des Electrolytes et Nanosystèmes Interfaciaux (PHENIX), Sorbonne Université, CNRS, F-75005 Paris, France
| | - Yohan Guyodo
- Université de Paris, Institut de physique du globe de Paris (IPGP), CNRS, F-75005 Paris, France
| | - Fadi Choueikani
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin - BP48, 91192 Gif-sur-Yvette, France
| | - Vincent Dupuis
- Laboratoire de Physicochimie des Electrolytes et Nanosystèmes Interfaciaux (PHENIX), Sorbonne Université, CNRS, F-75005 Paris, France
| | - Dario Taverna
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS, MNHN, UMR7590, 4 place Jussieu, 75052 Paris Cedex 05, France.
| | - Philippe Sainctavit
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS, MNHN, UMR7590, 4 place Jussieu, 75052 Paris Cedex 05, France. and Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin - BP48, 91192 Gif-sur-Yvette, France
| | - Amélie Juhin
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS, MNHN, UMR7590, 4 place Jussieu, 75052 Paris Cedex 05, France.
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9
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Li Z, Yin Y. Stimuli-Responsive Optical Nanomaterials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1807061. [PMID: 30773717 DOI: 10.1002/adma.201807061] [Citation(s) in RCA: 123] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 12/07/2018] [Indexed: 05/24/2023]
Abstract
Responsive optical nanomaterials that can sense and translate various external stimuli into optical signals, in the forms of observable changes in appearance and variations in spectral line shapes, are among the most active research topics in nanooptics. They are intensively exploited within the regimes of the four classic optical phenomena-diffraction in photonic crystals, absorption of plasmonic nanostructures, as well as color-switching systems, refraction of assembled birefringent nanostructures, and emission of photoluminescent nanomaterials and molecules. Herein, a comprehensive review of these research activities regarding the fundamental principles and practical strategies is provided. Starting with an overview of their substantial developments during the latest three decades, each subtopic discussion is led with fundamental theories that delineate the correlation between nanostructures and optical properties and the delicate research strategies are elaborated with specific attention focused on working principles and optical performances. The unique advantages and inherent limitations of each responsive optical nanoscale platform are summarized, accompanied by empirical criteria that should be met and perspectives on research opportunities where the developments of next-generation responsive optical nanomaterials might be directed.
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Affiliation(s)
- Zhiwei Li
- Department of Chemistry, University of California, Riverside, CA, 92521, USA
| | - Yadong Yin
- Department of Chemistry, University of California, Riverside, CA, 92521, USA
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10
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Pal A, Zinn T, Kamal MA, Narayanan T, Schurtenberger P. Anomalous Dynamics of Magnetic Anisotropic Colloids Studied by XPCS. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1802233. [PMID: 30102453 DOI: 10.1002/smll.201802233] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 07/12/2018] [Indexed: 05/25/2023]
Abstract
The influence of an applied magnetic field on the collective dynamics of novel anisotropic colloidal particles whose shape resembles peanuts is reported. Being made up of hematite cores and silica shells, these micrometer-sized particles align in a direction perpendicular to the applied external magnetic field, and assemble into chains along the field direction. The anisotropic dynamics of these particles is investigated using multispeckle ultrasmall-angle X-ray photon correlation spectroscopy (USA-XPCS). The results indicate that along the direction of the magnetic field, the particle dynamics strongly depends on the length scale probed. Here, the relaxation of the intermediate scattering function follows a compressed exponential behavior at large distances, while it appears diffusive at distances comparable or smaller than the particle size. Perpendicular to the applied field (and along the direction of gravity), the experimental data can be quantitatively reproduced by a combination of an advective term originating from sedimentation and a purely diffusive one that describes the thermal diffusion of the assembled chains and individual particles.
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Affiliation(s)
- Antara Pal
- Division of Physical Chemistry, Department of Chemistry, Lund University, SE-221 00, Lund, Sweden
| | - Thomas Zinn
- ESRF-The European Synchrotron, 38043, Grenoble, France
| | - Mohammad Arif Kamal
- Division of Physical Chemistry, Department of Chemistry, Lund University, SE-221 00, Lund, Sweden
| | | | - Peter Schurtenberger
- Division of Physical Chemistry, Department of Chemistry, Lund University, SE-221 00, Lund, Sweden
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11
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Lazarev S, Besedin I, Zozulya AV, Meijer JM, Dzhigaev D, Gorobtsov OY, Kurta RP, Rose M, Shabalin AG, Sulyanova EA, Zaluzhnyy I, Menushenkov AP, Sprung M, Petukhov AV, Vartanyants IA. Ptychographic X-Ray Imaging of Colloidal Crystals. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:1702575. [PMID: 29171683 DOI: 10.1002/smll.201702575] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 09/08/2017] [Indexed: 05/21/2023]
Abstract
Ptychographic coherent X-ray imaging is applied to obtain a projection of the electron density of colloidal crystals, which are promising nanoscale materials for optoelectronic applications and important model systems. Using the incident X-ray wavefield reconstructed by mixed states approach, a high resolution and high contrast image of the colloidal crystal structure is obtained by ptychography. The reconstructed colloidal crystal reveals domain structure with an average domain size of about 2 µm. Comparison of the domains formed by the basic close-packed structures, allows us to conclude on the absence of pure hexagonal close-packed domains and confirms the presence of random hexagonal close-packed layers with predominantly face-centered cubic structure within the analyzed part of the colloidal crystal film. The ptychography reconstruction shows that the final structure is complicated and may contain partial dislocations leading to a variation of the stacking sequence in the lateral direction. As such in this work, X-ray ptychography is extended to high resolution imaging of crystalline samples.
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Affiliation(s)
- Sergey Lazarev
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607, Hamburg, Germany
- National Research Tomsk Polytechnic University (TPU), pr. Lenina 30, 634050, Tomsk, Russia
| | - Ilya Besedin
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607, Hamburg, Germany
- National Research Nuclear University, MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, 115409, Moscow, Russia
| | - Alexey V Zozulya
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607, Hamburg, Germany
| | - Janne-Mieke Meijer
- Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterial Science, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands
| | - Dmitry Dzhigaev
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607, Hamburg, Germany
| | - Oleg Yu Gorobtsov
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607, Hamburg, Germany
| | - Ruslan P Kurta
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607, Hamburg, Germany
| | - Max Rose
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607, Hamburg, Germany
| | - Anatoly G Shabalin
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607, Hamburg, Germany
| | - Elena A Sulyanova
- Shubnikov Institute of Crystallography RAS, Leninskii pr. 59, 119333, Moscow, Russia
| | - IvanA Zaluzhnyy
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607, Hamburg, Germany
- National Research Nuclear University, MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, 115409, Moscow, Russia
| | - Alexey P Menushenkov
- National Research Nuclear University, MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, 115409, Moscow, Russia
| | - Michael Sprung
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607, Hamburg, Germany
| | - Andrei V Petukhov
- Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterial Science, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands
- Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, Netherlands
| | - Ivan A Vartanyants
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607, Hamburg, Germany
- National Research Nuclear University, MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, 115409, Moscow, Russia
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12
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Spiteri L, Messina R. Dipolar Crystals: The Crucial Role of the Clinohexagonal Prism Phase. PHYSICAL REVIEW LETTERS 2017; 119:155501. [PMID: 29077447 DOI: 10.1103/physrevlett.119.155501] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Indexed: 05/25/2023]
Abstract
We report a new phase called clinohexagonal prism (CHP) that accounts for all the ground states of dipolar hard spheres prepared at any density. This phase merely consists of an oblique prismatic lattice with a hexagonal base. Our calculations show that at intermediate densities, a special close packed body-centered orthorhombic phase coincides with the CHP phase in the ground state for a wide density window. In the high packing regime, i.e., in the vicinity of the density of the hexagonal close packed phase, it is a limiting case of the CHP phase with vanishing obliquity that emerges. These findings provide a unified and clarified view of the solid-solid transitions occurring at zero temperature in dipolar systems and should be relevant in other related molecular or soft matter systems governed by anisotropic (and possibly isotropic) soft potentials.
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Affiliation(s)
- Ludovic Spiteri
- Université de Lorraine, Equipe BioPhysStat, IJB FR CNRS 2843, 1 Boulevard Arago, 57070 Metz, France
| | - René Messina
- Université de Lorraine, Equipe BioPhysStat, IJB FR CNRS 2843, 1 Boulevard Arago, 57070 Metz, France
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13
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Nozawa J, Uda S, Guo S, Hu S, Toyotama A, Yamanaka J, Okada J, Koizumi H. Two-Dimensional Nucleation on the Terrace of Colloidal Crystals with Added Polymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:3262-3269. [PMID: 28300415 DOI: 10.1021/acs.langmuir.6b04532] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Understanding nucleation dynamics is important both fundamentally and technologically in materials science and other scientific fields. Two-dimensional (2D) nucleation is the predominant growth mechanism in colloidal crystallization, in which the particle interaction is attractive, and has recently been regarded as a promising method to fabricate varieties of complex nanostructures possessing innovative functionality. Here, polymers are added to a colloidal suspension to generate a depletion attractive force, and the detailed 2D nucleation process on the terrace of the colloidal crystals is investigated. In the system, we first measured the nucleation rate at various area fractions of particles on the terrace, ϕarea. In situ observations at single-particle resolution revealed that nucleation behavior follows the framework of classical nucleation theory (CNT), such as single-step nucleation pathway and existence of critical size. Characteristic nucleation behavior is observed in that the nucleation and growth stage are clearly differentiated. When many nuclei form in a small area of the terrace, a high density of kink sites of once formed islands makes growth more likely to occur than further nucleation because nucleation has a higher energy barrier than growth. The steady-state homogeneous 2D nucleation rate, J, and the critical size of nuclei, r*, are measured by in situ observations based on the CNT, which enable us to obtain the step free energy, γ, which is an important parameter for characterizing the nucleation process. The γ value is found to change according to the strength of attraction, which is tuned by the concentration of the polymer as a depletant.
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Affiliation(s)
- Jun Nozawa
- Institute for Materials Research, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Satoshi Uda
- Institute for Materials Research, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Suxia Guo
- Institute for Materials Research, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Sumeng Hu
- Institute for Materials Research, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Akiko Toyotama
- Graduate School of Pharmaceutical Sciences, Nagoya City University , 3-1 Tanabe, Mizuho, Nagoya, Aichi 467-8603, Japan
| | - Junpei Yamanaka
- Graduate School of Pharmaceutical Sciences, Nagoya City University , 3-1 Tanabe, Mizuho, Nagoya, Aichi 467-8603, Japan
| | - Junpei Okada
- Institute for Materials Research, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Haruhiko Koizumi
- Institute for Materials Research, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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14
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Dong X, Wu P, Hellmann GP, Wang C, Schäfer CG. Morphology-Controlled Coating of Colloidal Particles with Silica: Influence of Particle Surface Functionalization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2235-2247. [PMID: 28192995 DOI: 10.1021/acs.langmuir.6b04069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present a general, convenient, and efficient synthetic concept for the coating of colloidal particles with a silica (SiO2) shell of well-defined and precisely controlled morphology and porosity. Monodisperse submicroscopic polystyrene (PS) particles were synthesized via two-stage emulsifier-free emulsion polymerization and subsequent swelling polymerization, enabling selective particle surface modification by the incorporation of ionic (methacrylic acid, MAA) or nonionic (hydroxyethyl methacrylate, HEMA or methacrylamide, MAAm) comonomers, which could be proven by zeta potential measurements as well as by determining the three-phase contact angle of the colloidal particles adsorbed at the air-water and n-decane-water interface. The functionalized particles could be directly coated with silica shells of variable thickness, porosity, and controlled surface roughness in a seeded sol-gel process from tetraethoxysilane (TEOS), leading to hybrid PS@silica particles with morphologies ranging from core-shell (CS) to raspberry-type architectures. The experimental results demonstrated that the silica coating could be precisely tailored by the type of surface functionalization, which strongly influences the surface properties of the colloidal particles and thus the morphology of the final silica shell. Furthermore, the PS cores could be easily removed by thermal treatment, yielding extremely uniform hollow silica particles, while maintaining their initial shell architecture. These particles are highly stable against irreversible aggregation and could be readily dried, purified, and redispersed in various solvents. Herein we show a first example of coating semiconducting CdSe/ZnS nanocrystals with smooth and spherical silica shells by applying the presented method that are expected to be suitable systems for applications as markers in biology and life science by using fluorescence microscopy methods, which are also briefly discussed.
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Affiliation(s)
- Xu Dong
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, and Laboratory of Advanced Materials, Fudan University , 220 Handan Road, Shanghai 200433, China
| | - Pan Wu
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, and Laboratory of Advanced Materials, Fudan University , 220 Handan Road, Shanghai 200433, China
| | - Goetz P Hellmann
- German Institute for Polymers (DKI) , Schlossgartenstrasse 6, D-64289 Darmstadt, Germany
| | - Changchun Wang
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, and Laboratory of Advanced Materials, Fudan University , 220 Handan Road, Shanghai 200433, China
| | - Christian G Schäfer
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, and Laboratory of Advanced Materials, Fudan University , 220 Handan Road, Shanghai 200433, China
- German Institute for Polymers (DKI) , Schlossgartenstrasse 6, D-64289 Darmstadt, Germany
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15
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Niu W, Qu L, Lyv R, Zhang S. Reconfigurable photonic crystals with optical bistability enabled by “cold” programming and thermo-recoverable shape memory polymers. RSC Adv 2017. [DOI: 10.1039/c6ra28682h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A type of reconfigurable photonic crystals with optically bistable states enabled by capillary pressure-induced programming and heat-caused recoverable shape memory polymers was reported.
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Affiliation(s)
- Wenbin Niu
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- West Campus
- Dalian 116024
- China
| | - Lingcheng Qu
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- West Campus
- Dalian 116024
- China
| | - Rongwen Lyv
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- West Campus
- Dalian 116024
- China
| | - Shufen Zhang
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- West Campus
- Dalian 116024
- China
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16
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Yang P, Li H, Zhang S, Chen L, Zhou H, Tang R, Zhou T, Bao F, Zhang Q, He L, Zhang X. Gram-scale synthesis of superparamagnetic Fe 3O 4 nanocrystal clusters with long-term charge stability for highly stable magnetically responsive photonic crystals. NANOSCALE 2016; 8:19036-19042. [PMID: 27812595 DOI: 10.1039/c6nr07155d] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the gram-scale hydrothermal synthesis of superparamagnetic Fe3O4 CNCs with superior long-term charge stability, which are suitable building blocks for magnetically responsive photonic crystals (MRPCs) with widely, rapidly and reversibly tunable diffractions across the visible and near IR range, as well as long-term stability of photonic performances. The scalable synthesis of Fe3O4 CNCs with excellent long-term colloidal stability will facilitate their wide application in photonics, biomedicine, catalysis and other areas.
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Affiliation(s)
- Peipei Yang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, PR China.
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17
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Cîrcu M, Nan A, Borodi G, Liebscher J, Turcu R. Refinement of Magnetite Nanoparticles by Coating with Organic Stabilizers. NANOMATERIALS 2016; 6:nano6120228. [PMID: 28335356 PMCID: PMC5302720 DOI: 10.3390/nano6120228] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 11/07/2016] [Accepted: 11/18/2016] [Indexed: 01/08/2023]
Abstract
Magnetite nanoparticles are of great importance in nanotechnology and nanomedicine and have found manifold applications. Here, the effect of coating of magnetite nanoparticles with organic stabilizers, such as O-phosphoryl ethanolamine, glycerol phosphate, phospho-l-ascorbic acid, phospho-d,l-serine, glycolic acid, lactic acid, d,l-malic acid, and d,l-mandelic acid was studied. Remarkably, this procedure led to an improvement of saturation magnetization in three cases rather than to an unfavorable decrease as usually observed. Detailed X-ray powder diffraction investigations revealed that changes in the average crystallite occurred in the coating process. Surprisingly, changes of the average crystallite sizes in either direction were further observed, when the exposure time to the stabilizer was increased. These results imply a new mechanism for the well-known coating of magnetite nanoparticles with stabilizers. Instead of the hitherto accepted simple anchoring of the stabilizers to the magnetite nanoparticle surfaces, a more complex recrystallization mechanism is likely, wherein partial re-dispersion of magnetite moieties from the nanoparticles and re-deposition are involved. The results can help producers and users of magnetite nanoparticles to obtain optimal results in the production of core shell magnetite nanoparticles.
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Affiliation(s)
- Monica Cîrcu
- National Institute of Research and Development for Isotopic and Molecular Technologies, Donat 67-103, RO-400293 Cluj-Napoca, Romania.
| | - Alexandrina Nan
- National Institute of Research and Development for Isotopic and Molecular Technologies, Donat 67-103, RO-400293 Cluj-Napoca, Romania.
| | - Gheorghe Borodi
- National Institute of Research and Development for Isotopic and Molecular Technologies, Donat 67-103, RO-400293 Cluj-Napoca, Romania.
| | - Jürgen Liebscher
- National Institute of Research and Development for Isotopic and Molecular Technologies, Donat 67-103, RO-400293 Cluj-Napoca, Romania.
- Department of Chemistry, Humboldt-University Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Rodica Turcu
- National Institute of Research and Development for Isotopic and Molecular Technologies, Donat 67-103, RO-400293 Cluj-Napoca, Romania.
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18
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Fu Z, Xiao Y, Feoktystov A, Pipich V, Appavou MS, Su Y, Feng E, Jin W, Brückel T. Field-induced self-assembly of iron oxide nanoparticles investigated using small-angle neutron scattering. NANOSCALE 2016; 8:18541-18550. [PMID: 27782247 DOI: 10.1039/c6nr06275j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The magnetic-field-induced assembly of magnetic nanoparticles (NPs) provides a unique and flexible strategy in the design and fabrication of functional nanostructures and devices. We have investigated the field-induced self-assembly of core-shell iron oxide NPs dispersed in toluene by means of small-angle neutron scattering (SANS). The form factor of the core-shell NPs was characterized and analyzed using SANS with polarized neutrons. Large-scale aggregates of iron oxide NPs formed above 0.02 T as indicated by very-small-angle neutron scattering measurements. A three-dimensional long-range ordered superlattice of iron oxide NPs was revealed under the application of a moderate magnetic field. The crystal structure of the superlattice has been identified to be face-centred cubic.
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Affiliation(s)
- Zhendong Fu
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, D-85748 Garching, Germany.
| | - Yinguo Xiao
- Jülich Centre for Neutron Science and Peter Grünberg Institut, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Artem Feoktystov
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, D-85748 Garching, Germany.
| | - Vitaliy Pipich
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, D-85748 Garching, Germany.
| | - Marie-Sousai Appavou
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, D-85748 Garching, Germany.
| | - Yixi Su
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, D-85748 Garching, Germany.
| | - Erxi Feng
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, D-85748 Garching, Germany.
| | - Wentao Jin
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, D-85748 Garching, Germany.
| | - Thomas Brückel
- Jülich Centre for Neutron Science and Peter Grünberg Institut, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
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19
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Adsorption, Desorption, Surface Diffusion, Lattice Defect Formation, and Kink Incorporation Processes of Particles on Growth Interfaces of Colloidal Crystals with Attractive Interactions. CRYSTALS 2016. [DOI: 10.3390/cryst6070080] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Timonen JVI, Demirörs AF, Grzybowski BA. Magnetofluidic Tweezing of Nonmagnetic Colloids. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:3453-3459. [PMID: 26990182 DOI: 10.1002/adma.201506072] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 01/22/2016] [Indexed: 06/05/2023]
Abstract
Magnetofluidic tweezing based on negative magnetophoresis and microfabricated core-shell magnetic microtips allows controlled on-demand assembly of colloids and microparticles into various static and dynamic structures such as colloidal crystals (as shown for 3.2 μm silica particles).
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Affiliation(s)
- Jaakko V I Timonen
- Harvard John A. Paulson School of Engineeringand Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | | | - Bartosz A Grzybowski
- IBS Center for Soft and Living Matter and the Department of Chemistry, UNIST, Ulsan, South Korea
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21
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Xue X, Wang J, Furlani EP. Self-Assembly of Crystalline Structures of Magnetic Core-Shell Nanoparticles for Fabrication of Nanostructured Materials. ACS APPLIED MATERIALS & INTERFACES 2015; 7:22515-22524. [PMID: 26389965 DOI: 10.1021/acsami.5b08310] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A theoretical study is presented of the template-assisted formation of crystalline superstructures of magnetic-dielectric core-shell particles. The templates produce highly localized gradient fields and a corresponding magnetic force that guides the assembly with nanoscale precision in particle placement. The process is studied using two distinct and complementary computational models that predict the dynamics and energy of the particles, respectively. Both mono- and polydisperse colloids are studied, and the analysis demonstrates for the first time that although the particles self-assemble into ordered crystalline superstructures, the particle formation is not unique. There is a Brownian motion-induced degeneracy in the process wherein various distinct, energetically comparable crystalline structures can form for a given template geometry. The models predict the formation of hexagonal close packed (HCP) and face centered cubic (FCC) structures as well as mixed phase structures due to in-plane stacking disorders, which is consistent with experimental observations. The polydisperse particle structures are less uniform than the monodisperse particle structures because of the irregular packing of different-sized particles. A comparison of self-assembly using soft- and hard-magnetic templates is also presented, the former being magnetized in a uniform field. This analysis shows that soft-magnetic templates enable an order-of-magnitude more rapid assembly and much higher spatial resolution in particle placement than their hard-magnetic counterparts. The self-assembly method discussed is versatile and broadly applies to arbitrary template geometries and multilayered and multifunctional mono- and polydisperse core-shell particles that have at least one magnetic component. As such, the method holds potential for the bottom-up fabrication of functional nanostructured materials for a broad range of applications. This work provides unprecedented insight into the assembly process, especially with respect to the viability and potential fundamental limitations of realizing structure-dependent material properties for applications.
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Affiliation(s)
- Xiaozheng Xue
- Department of Chemical and Biological Engineering and ‡Department of Electrical Engineering, University at Buffalo SUNY , Buffalo, New York 14260, United States
| | - Jianchao Wang
- Department of Chemical and Biological Engineering and ‡Department of Electrical Engineering, University at Buffalo SUNY , Buffalo, New York 14260, United States
| | - Edward P Furlani
- Department of Chemical and Biological Engineering and ‡Department of Electrical Engineering, University at Buffalo SUNY , Buffalo, New York 14260, United States
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22
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Liu P, de Folter JWJ, Petukhov AV, Philipse AP. Reconfigurable assembly of superparamagnetic colloids confined in thermo-reversible microtubes. SOFT MATTER 2015; 11:6201-6211. [PMID: 26144213 DOI: 10.1039/c5sm01035g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Structural transformations of superparamagnetic colloids confined within self-assembled microtubes are studied by systematically varying tube-colloid size ratios and external magnetic field directions. A magnetic field parallel to microtubes may stretch non-linear chains like zigzag chains into linear chains. Non-parallel fields induce new structures including repulsive chains of single colloids, kinked chains and repulsive dimers, which are not observed for unconfined magnetic colloids in the bulk. The formed colloidal structures are confirmed via model calculations which account for tube-colloid size ratio effects and their reconfigurability with the field direction. Furthermore, structures are formed that allow controllable switching between a helical and a non-helical state. All observed field-induced transformations in microtubes are reversible provided the microtubes are not completely filled with colloids. In addition, we demonstrate magnetic field-responsive 2D crystallization by extending control over colloidal configurations in single microtubes to multiple well-aligned microtubes.
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Affiliation(s)
- Ping Liu
- Van 't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterials Science, Utrecht University, Padualaan 8, 3584CH, The Netherlands.
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23
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Petukhov AV, Meijer JM, Vroege GJ. Particle shape effects in colloidal crystals and colloidal liquid crystals: Small-angle X-ray scattering studies with microradian resolution. Curr Opin Colloid Interface Sci 2015. [DOI: 10.1016/j.cocis.2015.09.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Passow C, ten Hagen B, Löwen H, Wagner J. Depolarized light scattering from prolate anisotropic particles: The influence of the particle shape on the field autocorrelation function. J Chem Phys 2015; 143:044903. [DOI: 10.1063/1.4926931] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Affiliation(s)
| | - Borge ten Hagen
- Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany
| | - Hartmut Löwen
- Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany
| | - Joachim Wagner
- Institut für Chemie, Universität Rostock, D-18051 Rostock, Germany
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25
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Shen X, Mei C, He H, Zhou M, Xia W, Zeng X. Spontaneous structure transition in nanoparticle aggregates: from amorphous clusters to super-crystals. CrystEngComm 2015. [DOI: 10.1039/c5ce00896d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Spontaneous structure transition is studied in a real NP system, which reveals some important details of this transition.
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Affiliation(s)
- Xiaoshuang Shen
- School of Physical Science and Technology & Institute of Optoelectronic Technology
- Yangzhou University
- Yangzhou 225002, PR China
| | - Chao Mei
- School of Physical Science and Technology & Institute of Optoelectronic Technology
- Yangzhou University
- Yangzhou 225002, PR China
| | - Hui He
- School of Physical Science and Technology & Institute of Optoelectronic Technology
- Yangzhou University
- Yangzhou 225002, PR China
| | - Min Zhou
- School of Physical Science and Technology & Institute of Optoelectronic Technology
- Yangzhou University
- Yangzhou 225002, PR China
| | - Weiwei Xia
- School of Physical Science and Technology & Institute of Optoelectronic Technology
- Yangzhou University
- Yangzhou 225002, PR China
| | - Xianghua Zeng
- School of Physical Science and Technology & Institute of Optoelectronic Technology
- Yangzhou University
- Yangzhou 225002, PR China
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