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Lee S, Kim Y, Choi PJ, Jang A. Predicting the removal efficiency of pharmaceutical and personal care products using heated metal oxides as adsorbents based on their physicochemical characteristics. CHEMOSPHERE 2023; 339:139665. [PMID: 37506890 DOI: 10.1016/j.chemosphere.2023.139665] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 06/30/2023] [Accepted: 07/25/2023] [Indexed: 07/30/2023]
Abstract
Pharmaceutical and personal care products (PPCPs) are emerging pollutants that are commonly found in the environment and exist predominantly in nondegradable forms. Several attempts have been made to remove PPCPs via conventional wastewater treatment processes; however, these processes have limitations, such as high costs and insufficient removal efficiencies. Adsorption is a promising alternative for removing PPCPs because it is inexpensive, highly reusable, and easy to operate. Therefore, this study aims to determine the contributing characteristics that can be used to predict the adsorption behaviour of PPCPs based on their physicochemical properties, with heated metal oxide adsorbents (HMOAs). HAOP (heated aluminium oxide particles) and HIOP (heated iron oxide particles) with particle sizes below 38 μm were used. Results from the Brunauer-Emmett-Teller (BET) analysis show that HIOP has higher surface area and smaller pore size (113.7 ± 26.3 m2/g and 5.4 ± 1.8 nm) than HAOP (14.5 ± 0.6 m2/g and 18.6 ± 3.1 nm), which suggest that HIOP would show superior adsorption rates compared to HAOP. The adsorption mechanism is identified based on three major physicochemical properties of PPCPs: molecular weight (M.W.), octanol-water partition coefficient (log Kow), and acid dissociation constant (pKa). The results suggest that the most dominant factor that contributes to the adsorption of PPCPs on to HMOAs is the M.W., where the larger the molecular size, the better the adsorption efficiency. The tests conducted with varying log Kow values revealed that the hydrophilicity of the adsorbent influences the adsorption performance. It was found that HIOP exhibits better removal efficiencies with hydrophilic PPCPs (up to 83%) than with hydrophobic PPCPs (48%), while HAOP exhibits better removal efficiencies with hydrophobic PPCPs (86%) than with hydrophilic PPCPs, with less than 10% removal. Unlike the M.W. and pKa values, the log Kow does not exhibit any visible trend. Therefore, the adsorption behaviour can be predicted with the M.W. and pKa values of the PPCPs, when HAOP and HIOP are used as adsorbents.
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Affiliation(s)
- Soyeon Lee
- Department of Global Smart City, Sungkyunkwan University (SKKU), 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16419, Republic of Korea.
| | - Youjin Kim
- Department of Global Smart City, Sungkyunkwan University (SKKU), 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16419, Republic of Korea.
| | - Paula Jungwon Choi
- Department of Global Smart City, Sungkyunkwan University (SKKU), 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16419, Republic of Korea.
| | - Am Jang
- Department of Global Smart City, Sungkyunkwan University (SKKU), 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16419, Republic of Korea.
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Lozano MS, Bernat-Montoya I, Angelova TI, Mojena AB, Díaz-Fernández FJ, Kovylina M, Martínez A, Cienfuegos EP, Gómez VJ. Plasma-Induced Surface Modification of Sapphire and Its Influence on Graphene Grown by Plasma-Enhanced Chemical Vapour Deposition. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1952. [PMID: 37446468 DOI: 10.3390/nano13131952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 06/22/2023] [Accepted: 06/26/2023] [Indexed: 07/15/2023]
Abstract
In this work, we study the influence of the different surface terminations of c-plane sapphire substrates on the synthesis of graphene via plasma-enhanced chemical vapor deposition. The different terminations of the sapphire surface are controlled by a plasma process. A design of experiments procedure was carried out to evaluate the major effects governing the plasma process of four different parameters: i.e., discharge power, time, pressure and gas employed. In the characterization of the substrate, two sapphire surface terminations were identified and characterized by means of contact angle measurements, being a hydrophilic (hydrophobic) surface and the fingerprint of an Al- (OH-) terminated surface, respectively. The defects within the synthesized graphene were analyzed by Raman spectroscopy. Notably, we found that the ID/IG ratio decreases for graphene grown on OH-terminated surfaces. Furthermore, two different regimes related to the nature of graphene defects were identified and, depending on the sapphire terminated surface, are bound either to vacancy or boundary-like defects. Finally, studying the density of defects and the crystallite area, as well as their relationship with the sapphire surface termination, paves the way for increasing the crystallinity of the synthesized graphene.
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Affiliation(s)
- Miguel Sinusia Lozano
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Ignacio Bernat-Montoya
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Todora Ivanova Angelova
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Alberto Boscá Mojena
- Institute of Optoelectronic Systems and Microtechnology (ISOM), Universidad Politécnica de Madrid, 28040 Madrid, Spain
| | | | - Miroslavna Kovylina
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Alejandro Martínez
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Elena Pinilla Cienfuegos
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Víctor J Gómez
- Nanophotonics Technology Center (NTC), Universitat Politècnica de València, 46022 Valencia, Spain
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Bañuelos JL, Borguet E, Brown GE, Cygan RT, DeYoreo JJ, Dove PM, Gaigeot MP, Geiger FM, Gibbs JM, Grassian VH, Ilgen AG, Jun YS, Kabengi N, Katz L, Kubicki JD, Lützenkirchen J, Putnis CV, Remsing RC, Rosso KM, Rother G, Sulpizi M, Villalobos M, Zhang H. Oxide- and Silicate-Water Interfaces and Their Roles in Technology and the Environment. Chem Rev 2023; 123:6413-6544. [PMID: 37186959 DOI: 10.1021/acs.chemrev.2c00130] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Interfacial reactions drive all elemental cycling on Earth and play pivotal roles in human activities such as agriculture, water purification, energy production and storage, environmental contaminant remediation, and nuclear waste repository management. The onset of the 21st century marked the beginning of a more detailed understanding of mineral aqueous interfaces enabled by advances in techniques that use tunable high-flux focused ultrafast laser and X-ray sources to provide near-atomic measurement resolution, as well as by nanofabrication approaches that enable transmission electron microscopy in a liquid cell. This leap into atomic- and nanometer-scale measurements has uncovered scale-dependent phenomena whose reaction thermodynamics, kinetics, and pathways deviate from previous observations made on larger systems. A second key advance is new experimental evidence for what scientists hypothesized but could not test previously, namely, interfacial chemical reactions are frequently driven by "anomalies" or "non-idealities" such as defects, nanoconfinement, and other nontypical chemical structures. Third, progress in computational chemistry has yielded new insights that allow a move beyond simple schematics, leading to a molecular model of these complex interfaces. In combination with surface-sensitive measurements, we have gained knowledge of the interfacial structure and dynamics, including the underlying solid surface and the immediately adjacent water and aqueous ions, enabling a better definition of what constitutes the oxide- and silicate-water interfaces. This critical review discusses how science progresses from understanding ideal solid-water interfaces to more realistic systems, focusing on accomplishments in the last 20 years and identifying challenges and future opportunities for the community to address. We anticipate that the next 20 years will focus on understanding and predicting dynamic transient and reactive structures over greater spatial and temporal ranges as well as systems of greater structural and chemical complexity. Closer collaborations of theoretical and experimental experts across disciplines will continue to be critical to achieving this great aspiration.
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Affiliation(s)
- José Leobardo Bañuelos
- Department of Physics, The University of Texas at El Paso, El Paso, Texas 79968, United States
| | - Eric Borguet
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Gordon E Brown
- Department of Earth and Planetary Sciences, The Stanford Doerr School of Sustainability, Stanford University, Stanford, California 94305, United States
| | - Randall T Cygan
- Department of Soil and Crop Sciences, Texas A&M University, College Station, Texas 77843, United States
| | - James J DeYoreo
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Patricia M Dove
- Department of Geosciences, Department of Chemistry, Department of Materials Science and Engineering, Virginia Tech, Blacksburg, Virginia 24060, United States
| | - Marie-Pierre Gaigeot
- Université Paris-Saclay, Univ Evry, CNRS, LAMBE UMR8587, 91025 Evry-Courcouronnes, France
| | - Franz M Geiger
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Julianne M Gibbs
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2Canada
| | - Vicki H Grassian
- Department of Chemistry and Biochemistry, University of California, San Diego, California 92093, United States
| | - Anastasia G Ilgen
- Geochemistry Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Young-Shin Jun
- Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Nadine Kabengi
- Department of Geosciences, Georgia State University, Atlanta, Georgia 30303, United States
| | - Lynn Katz
- Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - James D Kubicki
- Department of Earth, Environmental & Resource Sciences, The University of Texas at El Paso, El Paso, Texas 79968, United States
| | - Johannes Lützenkirchen
- Karlsruher Institut für Technologie (KIT), Institut für Nukleare Entsorgung─INE, Eggenstein-Leopoldshafen 76344, Germany
| | - Christine V Putnis
- Institute for Mineralogy, University of Münster, Münster D-48149, Germany
| | - Richard C Remsing
- Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey 08854, United States
| | - Kevin M Rosso
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Gernot Rother
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Marialore Sulpizi
- Department of Physics, Ruhr Universität Bochum, NB6, 65, 44780, Bochum, Germany
| | - Mario Villalobos
- Departamento de Ciencias Ambientales y del Suelo, LANGEM, Instituto De Geología, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Huichun Zhang
- Department of Civil and Environmental Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States
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Juzsakova T, Salman AD, Abdullah TA, Rasheed RT, Zsirka B, Al-Shaikhly RR, Sluser B, Cretescu I. Removal of Methylene Blue from Aqueous Solution by Mixture of Reused Silica Gel Desiccant and Natural Sand or Eggshell Waste. MATERIALS (BASEL, SWITZERLAND) 2023; 16:1618. [PMID: 36837246 PMCID: PMC9965102 DOI: 10.3390/ma16041618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 02/02/2023] [Accepted: 02/07/2023] [Indexed: 06/18/2023]
Abstract
The purpose of this work was to develop, characterize and test new low-cost materials suitable for removing methylene blue dye from water and wastewater by adsorption. The solid materials consisted of silica gel powder (SG), silica gel mixed with eggshell powder (SG-ES) and a mixture of silica gel with sand from the western Iraqi desert (SG-SI). The samples were milled by using an electrical mixer and a ball mill, followed by a drying step. In addition, desert sand was acid-treated in order to remove impurities. The structure and chemical composition of the samples were investigated by X-ray diffraction (XRD), a scanning electron microscopy technique equipped with an energy-dispersive X-ray spectrometer (SEM-EDX), a low-temperature nitrogen adsorption (BET) technique, thermo-analytical (TG/TGA) measurements and Fourier-transformed infrared spectroscopy (FTIR). The previously mentioned materials were tested to remove methylene blue from an aqueous solution. The adsorption experiments were monitored by ultraviolet-visible (UV-Vis) spectrophotometry and showed that SG and SG-ES gave promising results for the methylene blue removal from water. After 40 min of treatment of the aqueous solution containing 10 mg/L of MB at room temperature, the tested SG, SG-ES and SG-SI materials were found to have 86%, 80% and 57% dye adsorption efficiency, respectively. Taking into consideration not only the adsorption activity of the studied material but their availability, cost and concepts of cleaner production and waste minimization, the developed silica gel with eggshell can be considered as a good, cost-effective alternative to commercially available activated-carbon-based adsorbents. Different kinetic and isotherm models were fitted to the experimental results. A pseudo-second-kinetics-order model revealed high correlation fitting, while the Freundlich model was found to appropriately describe the adsorption isotherm. The thermal stability during the possible regeneration process of the SG-ES adsorbent mixture and its interaction mechanism with cationic dye was discussed.
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Affiliation(s)
- Tatjana Juzsakova
- Sustainability Solutions Research Lab, Research Centre for Biochemical, Environmental and Chemical Engineering, Faculty of Engineering, University of Pannonia, P.O. Box 158, H-8201 Veszprem, Hungary
| | - Ali Dawood Salman
- Department of Chemical and Petroleum Refining Engineering, College of Oil and Gas Engineering, Basra University for Oil and Gas, Basra 61004, Iraq
| | - Thamer Adnan Abdullah
- Chemistry Branch, Applied Sciences Department, University of Technology, Baghdad 10070, Iraq
| | - Rashed Taleb Rasheed
- Chemistry Branch, Applied Sciences Department, University of Technology, Baghdad 10070, Iraq
| | - Balázs Zsirka
- Research Group of Analytical Chemistry/Laboratory for Surfaces and Nanostructures, Center for Natural Sciences, University of Pannonia, P.O. Box 158, H-8201 Veszprem, Hungary
| | - Rasha R. Al-Shaikhly
- Department of Prosthetic Dental Technology, Faculty of Health and Medical Technology, Al-Farahidi University, Al-Jadiriyah Bridge, Baghdad 10070, Iraq
| | - Brindusa Sluser
- Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73, Blvd. D. Mangeron, 700050 Iasi, Romania
| | - Igor Cretescu
- Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73, Blvd. D. Mangeron, 700050 Iasi, Romania
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Park Y, Ahn C, Ahn JG, Kim JH, Jung J, Oh J, Ryu S, Kim S, Kim SC, Kim T, Lim H. Critical Role of Surface Termination of Sapphire Substrates in Crystallographic Epitaxial Growth of MoS 2 Using Inorganic Molecular Precursors. ACS NANO 2023; 17:1196-1205. [PMID: 36633192 DOI: 10.1021/acsnano.2c08983] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
A highly reproducible route for the epitaxial growth of single-crystalline monolayer MoS2 on a C-plane sapphire substrate was developed using vapor-pressure-controllable inorganic molecular precursors MoOCl4 and H2S. Microscopic, crystallographic, and spectroscopic analyses indicated that the epitaxial MoS2 film possessed outstanding electrical and optical properties, excellent homogeneity, and orientation selectivity. The systematic investigation of the effect of growth temperature on the crystallographic orientations of MoS2 revealed that the surface termination of the sapphire substrate with respect to the growth temperature determines the crystallographic orientation selectivity of MoS2. Our results suggest that controlling the surface to form a half-Al-terminated surface is a prerequisite for the epitaxial growth of MoS2 on a C-plane sapphire substrate. The insights on the growth mechanism, especially the significance of substrate surface termination, obtained through this study will aid in designing efficient epitaxial growth routes for developing single-crystalline monolayer transition metal dichalcogenides.
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Affiliation(s)
- Younghee Park
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
| | - Chaehyeon Ahn
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
| | - Jong-Guk Ahn
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
| | - Jee Hyeon Kim
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
| | - Jaehoon Jung
- Department of Chemistry, University of Ulsan, Ulsan44776, Republic of Korea
| | - Juseung Oh
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang37673, Republic of Korea
| | - Sunmin Ryu
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang37673, Republic of Korea
| | - Soyoung Kim
- Analysis and Assessment Group, Research Institute of Industrial Science and Technology, Pohang37673, Republic of Korea
| | - Seung Cheol Kim
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
| | - Taewoong Kim
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
| | - Hyunseob Lim
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju61005, Republic of Korea
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Superhydrophilicity of α-Alumina Surfaces Results from Tight Binding of Interfacial Waters to Specific Aluminols. J Colloid Interface Sci 2022; 628:943-954. [DOI: 10.1016/j.jcis.2022.07.164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 07/25/2022] [Accepted: 07/26/2022] [Indexed: 11/21/2022]
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Abdelmonem A, Zhang Y, Braunschweig B, Glikman D, Rumpel A, Peukert W, Begović T, Liu X, Lützenkirchen J. Adsorption of CTAB on Sapphire- c at High pH: Surface and Zeta Potential Measurements Combined with Sum-Frequency and Second-Harmonic Generation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:3380-3391. [PMID: 35271289 DOI: 10.1021/acs.langmuir.1c03069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The adsorption of cetyltrimethylammonium bromide (CTA+Br-) on sapphire-c surfaces was studied at pH 10 below the surfactants' critical micelle concentration. The evolution of interfacial potentials as a function of CTAB concentration was characterized by surface and zeta potential measurements and complemented by molecular dynamic (MD) simulations as well as by second-harmonic (SHG) and vibrational sum-frequency generation (SFG) spectroscopy. The changes in interfacial potentials suggest that the negative interfacial charge due to deprotonated surface aluminols groups is neutralized and can be even overcompensated by the presence of CTA+ cations at the interface. However, SFG intensities from strongly hydrogen-bonded interfacial water molecules as well as SHG intensities decrease with both increasing CTAB concentration and the magnitude of the surface potential. They do not suggest a charge reversal at the interface, while the change in zeta potential is actually consistent with an apparent charge inversion. This can be qualitatively explained by results from MD simulation, which reveal adsorbed CTA+ cations outside a first strongly bound hydration layer of water molecules, where they can locally distort the structural order and replace some of the interfacial water molecules adjacent to the first layer. This is proposed to be the origin for the significant loss in SFG and SHG intensities with increasing CTAB concentration. Moreover, we propose that CTA+ can act as a counterion and enhance the occurrence of deprotonated surface aluminols that is consistent with the decrease in surface potential.
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Affiliation(s)
- Ahmed Abdelmonem
- Institute of Meteorology and Climate Research - Atmospheric Aerosol Research (IMKAAF), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
| | - Yingchun Zhang
- State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
| | - Björn Braunschweig
- Institute of Physical Chemistry, Westfälische Wilhelms University Münster, Corrensstraße 28-30, 48149 Münster, Germany
| | - Dana Glikman
- Institute of Physical Chemistry, Westfälische Wilhelms University Münster, Corrensstraße 28-30, 48149 Münster, Germany
| | - Armin Rumpel
- Institute of Particle Technology (LFG), Friedrich Alexander University Erlangen-Nürnberg, Cauerstraße 4, 91058 Erlangen, Germany
| | - Wolfgang Peukert
- Institute of Particle Technology (LFG), Friedrich Alexander University Erlangen-Nürnberg, Cauerstraße 4, 91058 Erlangen, Germany
| | - Tajana Begović
- Department of Chemistry, University of Zagreb, Faculty of Science, Horvatovac 102a, 10 000 Zagreb, Croatia
| | - Xiandong Liu
- State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
| | - Johannes Lützenkirchen
- Institute of Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
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Understanding the electrosteric dispersion of α-alumina particles using a sulfonated tannin of natural origin. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Bioconjugation Strategy for Ceramic Membranes Decorated with Candida Antarctica Lipase B-Impact of Immobilization Process on Material Features. MATERIALS 2022; 15:ma15020671. [PMID: 35057388 PMCID: PMC8779185 DOI: 10.3390/ma15020671] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 12/31/2021] [Accepted: 01/12/2022] [Indexed: 11/17/2022]
Abstract
A strategy for the bioconjugation of the enzyme Candida antarctica lipase B onto titania ceramic membranes with varied pore sizes (15, 50, 150, and 300 kDa) was successfully performed. The relationship between the membrane morphology, i.e.,the pore size of the ceramic support, and bioconjugation performance was considered. Owing to the dimension of the enzyme (~33 kDa), the morphology of the ceramics allowed (50, 150, and 300 kDa) or did not allow (15 kDa) the entrance of the enzyme molecules into the porous structure. Such a strategy made it possible to better understand the changes in the material (morphology) and physicochemical features (wettability, adhesiveness, and surface charge) of the samples, which were systematically examined. The silane functionalization and enzyme immobilization were accomplished via the covalent route. The samples were characterized after each stage of the modification, which was very informative from the material point of view. As a consequence of the modification, significant changes in the contact angle, roughness, adhesion, and zeta potential were observed. For instance, for the 50 kDa membrane, the contact angle increased from 29.1 ± 1.5° for the pristine sample to 72.3 ± 1.5° after silane attachment; subsequently, it was reduced to 57.2 ± 1.5° after the enzyme immobilization. Finally, the contact angle of the bioconjugated membrane used in the enzymatic process rose to 92.9 ± 1.5°. By roughness (Sq) controlling, the following amendments were noticed: for the pristine 50 kDa membrane, Sq = 1.87 ± 0.21 µm; after silanization, Sq = 2.33 ± 0.30 µm; after enzyme immobilization, Sq = 2.74 ± 0.26 µm; and eventually, after the enzymatic process, Sq = 2.37 ± 0.27 µm. The adhesion work of the 50 kDa samples was equal to 136.41 ± 2.20 mN m−1 (pristine membrane), 94.93 ± 2.00 mN m−1 (with silane), 112.24 ± 1.90 mN m−1 (with silane and enzyme), and finally, 69.12 ± 1.40 mN m−1 (after the enzymatic process). The materials and physicochemical features changed substantially, particularly after the application of the membrane in the enzymatic process. Moreover, the impact of ceramic material morphology on the zeta potential value is here presented for the first time. With an increase in the ceramic support cut-off, the amount of immobilized lipase rose, but the specific productivity was higher for membranes possessing smaller pores, owing to the higher grafting density. For the enzymatic process, two modes of accomplishment were selected, i.e., stirred-tank and cross-flow. The latter method was characterized by a much higher effectiveness, with a resulting productivity equal to 99.7 and 60.3 µmol h−1 for the 300 and 15 kD membranes, respectively.
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Häntsch Y, Shang G, Lei B, Winhard B, Petrov A, Eich M, Holm E, Schneider GA, Furlan KP. Tailoring Disorder and Quality of Photonic Glass Templates for Structural Coloration by Particle Charge Interactions. ACS APPLIED MATERIALS & INTERFACES 2021; 13:20511-20523. [PMID: 33878268 DOI: 10.1021/acsami.1c01392] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
To obtain high-quality homogeneous photonic glass-based structural color films over large areas, it is essential to precisely control the degree of disorder of the spherical particles used and reduce the crack density within the films as much as possible. To tailor the disorder and quality of photonic glasses, a heteroaggregation-based process was developed by employing two oppositely charged equal-sized polystyrene (PS) particle types. The influence of the particle size ratio on the extent of heteroaggregation in the suspension mixes is investigated and correlated with both the morphology and the resultant optical properties of the films. The results show that the oppositely charged particle size ratio within the mix greatly influences the assembled structure in the films, affecting their roughness, crack density, and the coffee-ring formation. To better differentiate the morphology of the films, scanning electron microscopy images of the microstructures were classified by a supervised training of a deep convolutional neural network model to find distinctions that are inaccessible by conventional image analysis methods. Selected compositions were then infiltrated with TiO2 via atomic layer deposition, and after removal of the PS spheres, surface-templated inverse photonic glasses were obtained. Different color impressions and optical properties were obtained depending on the heteroaggregation level and thus the quality of the resultant films. The best results regarding the stability of the films and suppression of coffee-ring formation are obtained with a 35 wt % positively charged over negatively charged particle mix, which yielded enhanced structural coloration associated with improved film quality, tailored by the heteroaggregation fabrication process.
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Affiliation(s)
- Yen Häntsch
- Institute of Advanced Ceramics, Hamburg University of Technology, Denickestraße 15, 21073 Hamburg, Germany
| | - Guoliang Shang
- Institute of Optical and Electronic Materials, Hamburg University of Technology, Eißendorfer Straße 38, 21073 Hamburg, Germany
| | - Bo Lei
- Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Benedikt Winhard
- Institute of Advanced Ceramics, Hamburg University of Technology, Denickestraße 15, 21073 Hamburg, Germany
| | - Alexander Petrov
- Institute of Optical and Electronic Materials, Hamburg University of Technology, Eißendorfer Straße 38, 21073 Hamburg, Germany
- ITMO University, 49 Kronverkskii Avenue, 197101 St. Petersburg, Russia
| | - Manfred Eich
- Institute of Optical and Electronic Materials, Hamburg University of Technology, Eißendorfer Straße 38, 21073 Hamburg, Germany
- Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Straße 1, 21502 Geesthacht, Germany
| | - Elizabeth Holm
- Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Gerold A Schneider
- Institute of Advanced Ceramics, Hamburg University of Technology, Denickestraße 15, 21073 Hamburg, Germany
| | - Kaline P Furlan
- Institute of Advanced Ceramics, Hamburg University of Technology, Denickestraße 15, 21073 Hamburg, Germany
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11
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Molecular Decoration of Ceramic Supports for Highly Effective Enzyme Immobilization-Material Approach. MATERIALS 2021; 14:ma14010201. [PMID: 33401646 PMCID: PMC7794798 DOI: 10.3390/ma14010201] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 12/29/2020] [Accepted: 12/29/2020] [Indexed: 01/16/2023]
Abstract
A highly effective method was developed to functionalize ceramic supports (Al2O3 powders and membranes) using newly synthesized spacer molecules. The functionalized materials were subsequently utilized for Candida antarctica lipase B enzyme immobilization. The objective is to systematically evaluate the impact of various spacer molecules grafted onto the alumina materials will affect both the immobilization of the enzymes and specific material surface properties, critical to enzymatic reactors performance. The enzyme loading was significantly improved for the supports modified with shorter spacer molecules, which possessed higher grafting effectiveness on the order of 90%. The specific enzyme activity was found to be much higher for samples functionalized with longer modifiers yielding excellent enantioselectivity >97%. However, the enantiomeric ratio of the immobilized lipase was slightly lower in the case of shorter spacer molecules.
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12
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Evolving surface properties of stirred wet milled aluminum-doped titanium dioxide: A discretely heterogeneous system. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2020.09.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Chang J, Shao H, Liu B, Manica R, Li Z, Liu Q, Xu Z. Control of nanostructures through pH-dependent self-assembly of nanoplatelets. J Colloid Interface Sci 2021; 582:439-445. [DOI: 10.1016/j.jcis.2020.07.093] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 07/11/2020] [Accepted: 07/19/2020] [Indexed: 02/02/2023]
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14
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V Parlak Z, Labude N, Rütten S, Preisinger C, Niessen J, Aretz A, Zybała R, Telle R, Neuss S, Schickle K. Toward Innovative Hemocompatible Surfaces: Crystallographic Plane Impact on Platelet Activation. ACS Biomater Sci Eng 2020; 6:6726-6736. [PMID: 33320591 DOI: 10.1021/acsbiomaterials.0c00609] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The anticoagulation treatment of cardiovascular patients, which is mandatory after implantation of heart valves or stents, has significantly adverse effects on life quality. This treatment can be reduced or even circumvented by developing novel antithrombogenic surfaces of blood-contacting implants. Thus, we aim to discover materials exhibiting outstanding hemocompatibility compared to other available synthetic materials. We present promising surficial characteristics of single crystalline alumina in terms of platelet activation inhibition. In order to elucidate the relation between its crystallographic properties including the plane orientation and blood cell behavior, we examined endothelialization, cytocompatibility, and platelet activation at the blood-alumina interfaces in a controlled experimental setup. We observed that the cell response is highly sensitive to the plane orientation and differs significantly for (0001) and (11-20) planes of Al2O3. Our results reveal for the first time the dependence of platelet activation on crystallographic orientation, which is assumed to be a critical condition controlling the thrombogenicity. Additionally, we used an endothelial cell monolayer as an internal control since endothelial cells have an impact on vessel integrity and implant acceptance. We successfully demonstrate that Al2O3(11-20) exhibits enhanced hemocompatibility in contrast to Al2O3(0001) and is comparable to the physiological endothelial monolayer in vitro.
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Affiliation(s)
- Zümray V Parlak
- Department of Ceramics and Reftactory Materials, RWTH Aachen University, Mauerstrasse 5, Aachen 52064, Germany
| | - Norina Labude
- Helmholtz Institute for Biomedical Engineering, BioInterface Group, RWTH Aachen University, Pauwelsstrasse 20, Aachen 52074, Germany.,Institute of Pathology, RWTH Aachen University, Pauwelsstrasse 30, Aachen 52074, Germany
| | - Stephan Rütten
- Facility for Electron Microscopy, University Clinics, RWTH Aachen University, Pauwelsstrasse 30, Aachen 52074, Germany
| | - Christian Preisinger
- Proteomics Core Facility, IZKF Aachen, University Clinics, RWTH Aachen University, Pauwelsstrasse 30, Aachen 52074, Germany
| | - Jonas Niessen
- Department of Ceramics and Reftactory Materials, RWTH Aachen University, Mauerstrasse 5, Aachen 52064, Germany
| | - Anke Aretz
- Central Facility for Electron Microscopy, RWTH Aachen University, Ahornstrasse 55, Aachen 52074, Germany
| | - Rafal Zybała
- University Research Center Functional Materials, Warsaw University of Technology, 141 Wołoska St., Warsaw 02-507, Poland
| | - Rainer Telle
- Department of Ceramics and Reftactory Materials, RWTH Aachen University, Mauerstrasse 5, Aachen 52064, Germany
| | - Sabine Neuss
- Helmholtz Institute for Biomedical Engineering, BioInterface Group, RWTH Aachen University, Pauwelsstrasse 20, Aachen 52074, Germany.,Institute of Pathology, RWTH Aachen University, Pauwelsstrasse 30, Aachen 52074, Germany
| | - Karolina Schickle
- Department of Ceramics and Reftactory Materials, RWTH Aachen University, Mauerstrasse 5, Aachen 52064, Germany
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15
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Alimi OA, Ncongwane TB, Meijboom R. Design and fabrication of a monolith catalyst for continuous flow epoxidation of styrene in polypropylene printed flow reactor. Chem Eng Res Des 2020. [DOI: 10.1016/j.cherd.2020.04.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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16
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Alimi OA, Akinnawo CA, Meijboom R. Monolith catalyst design via 3D printing: a reusable support for modern palladium-catalyzed cross-coupling reactions. NEW J CHEM 2020. [DOI: 10.1039/d0nj03651j] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The use of an additive manufacturing procedure for the modification of catalytic structures is currently gaining popularity in the field of catalysis.
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Affiliation(s)
- Oyekunle Azeez Alimi
- Research Centre for Synthesis and Catalysis
- Department of Chemical Sciences
- University of Johannesburg
- Johannesburg 2006
- South Africa
| | - Christianah Aarinola Akinnawo
- Research Centre for Synthesis and Catalysis
- Department of Chemical Sciences
- University of Johannesburg
- Johannesburg 2006
- South Africa
| | - Reinout Meijboom
- Research Centre for Synthesis and Catalysis
- Department of Chemical Sciences
- University of Johannesburg
- Johannesburg 2006
- South Africa
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17
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Muller J, Prelot B, Zajac J, Monge S. Synthesis and study of sorption properties of polyvinyl alcohol (PVA)-based hybrid materials. REACT FUNCT POLYM 2019. [DOI: 10.1016/j.reactfunctpolym.2019.104364] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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18
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Akhtar N, Thomas PJ, Svardal B, Almenningen S, de Jong E, Magnussen S, Onck PR, Fernø MA, Holst B. Pillars or Pancakes? Self-Cleaning Surfaces without Coating. NANO LETTERS 2018; 18:7509-7514. [PMID: 30365888 DOI: 10.1021/acs.nanolett.8b02982] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Surfaces that stay clean when immersed in water are important for an enormous range of applications from ships and buildings to marine, medical, and other equipment. Up until now the main strategy for designing self-cleaning surfaces has been to combine hydrophilic/hydrophobic coatings with a high aspect ratio structuring (typically micron scale pillars) to trap a (semi)static water/air layer for drag and adhesion reduction. However, such coating and structuring can distort optical properties and get damaged in harsh environments, and contamination, i.e., particles, oil droplets, and biofouling, can get trapped and aggregate in the structure. Here we present a radically different strategy for self-cleaning surface design: We show that a surface can be made self-cleaning by structuring with a pattern of very low aspect ratio pillars ("pancakes"). Now the water is not trapped. It can flow freely around the pancakes thus creating a dynamic water layer. We have applied the new pancake design to sapphire windows and made the first surfaces that are self-cleaning through structuring alone without the application of any coating. An offshore installation has now been running continuously with structured windows for more than one year. The previous uptime for unstructured windows was 7 days.
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Affiliation(s)
- Naureen Akhtar
- Department of Physics and Technology , University of Bergen , P.O. Box 7803, NO-5020 Bergen , Norway
- Zernike Institute for Advanced Materials , University of Groningen , Nijenborgh 4 , NL-9747AG Groningen , The Netherlands
| | - Peter J Thomas
- Christian Michelsen Research AS , P.O. Box 6031, NO-5892 Bergen , Norway
| | - Benny Svardal
- Christian Michelsen Research AS , P.O. Box 6031, NO-5892 Bergen , Norway
| | - Stian Almenningen
- Department of Physics and Technology , University of Bergen , P.O. Box 7803, NO-5020 Bergen , Norway
| | - Edwin de Jong
- Zernike Institute for Advanced Materials , University of Groningen , Nijenborgh 4 , NL-9747AG Groningen , The Netherlands
| | | | - Patrick R Onck
- Zernike Institute for Advanced Materials , University of Groningen , Nijenborgh 4 , NL-9747AG Groningen , The Netherlands
| | - Martin A Fernø
- Department of Physics and Technology , University of Bergen , P.O. Box 7803, NO-5020 Bergen , Norway
| | - Bodil Holst
- Department of Physics and Technology , University of Bergen , P.O. Box 7803, NO-5020 Bergen , Norway
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19
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Vangala S, Siegel G, Prusnick T, Snure M. Wafer scale BN on sapphire substrates for improved graphene transport. Sci Rep 2018; 8:8842. [PMID: 29892008 PMCID: PMC5996022 DOI: 10.1038/s41598-018-27237-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 05/24/2018] [Indexed: 11/09/2022] Open
Abstract
Wafer scale (2”) BN grown by metal organic chemical vapor deposition (MOCVD) on sapphire was examined as a weakly interacting dielectric substrate for graphene, demonstrating improved transport properties over conventional sapphire and SiO2/Si substrates. Chemical vapor deposition grown graphene was transferred to BN/sapphire substrates for evaluation of more than 30 samples using Raman and Hall effects measurements. A more than 2x increase in Hall mobility and 10x reduction in sheet carrier density was measured for graphene on BN/sapphire compared to sapphire substrates. Through control of the MOCVD process, BN films with roughness ranging from <0.1 nm to >1 nm were grown and used to study the effects of substrate roughness on graphene transport. Arrays of graphene field effect transistors were fabricated on 2” BN/sapphire substrates demonstrating scalability and device performance enhancement.
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Affiliation(s)
- Shivashankar Vangala
- Air Force Research Laboratory, Sensors Directorate, Wright Patterson AFB, 45433, USA
| | - Gene Siegel
- Air Force Research Laboratory, Sensors Directorate, Wright Patterson AFB, 45433, USA.,KBR Wyle Laboratories, Beavercreek, OH, 45433, USA
| | - Timothy Prusnick
- Air Force Research Laboratory, Sensors Directorate, Wright Patterson AFB, 45433, USA.,KBR Wyle Laboratories, Beavercreek, OH, 45433, USA
| | - Michael Snure
- Air Force Research Laboratory, Sensors Directorate, Wright Patterson AFB, 45433, USA.
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20
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Lützenkirchen J, Franks G, Plaschke M, Zimmermann R, Heberling F, Abdelmonem A, Darbha G, Schild D, Filby A, Eng P, Catalano J, Rosenqvist J, Preocanin T, Aytug T, Zhang D, Gan Y, Braunschweig B. The surface chemistry of sapphire-c: A literature review and a study on various factors influencing its IEP. Adv Colloid Interface Sci 2018; 251:1-25. [PMID: 29287789 DOI: 10.1016/j.cis.2017.12.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 12/11/2017] [Accepted: 12/11/2017] [Indexed: 10/18/2022]
Abstract
A wide range of isoelectric points (IEPs) has been reported in the literature for sapphire-c (α-alumina), also referred to as basal plane, (001) or (0001), single crystals. Interestingly, the available data suggest that the variation of IEPs is comparable to the range of IEPs encountered for particles, although single crystals should be much better defined in terms of surface structure. One explanation for the range of IEPs might be the obvious danger of contaminating the small surface areas of single crystal samples while exposing them to comparatively large solution reservoirs. Literature suggests that factors like origin of the sample, sample treatment or the method of investigation all have an influence on the surfaces and it is difficult to clearly separate the respective, individual effects. In the present study, we investigate cause-effect relationships to better understand the individual effects. The reference IEP of our samples is between 4 and 4.5. High temperature treatment tends to decrease the IEP of sapphire-c as does UV treatment. Increasing the initial miscut (i.e. the divergence from the expected orientation of the crystal) tends to increase the IEP as does plasma cleaning, which can be understood assuming that the surfaces have become less hydrophobic due to the presence of more and/or larger steps with increasing miscut or due to amorphisation of the surface caused by plasma cleaning. Pre-treatment at very high pH caused an increase in the IEP. Surface treatments that led to IEPs different from the stable value of reference samples typically resulted in surfaces that were strongly affected by subsequent exposure to water. The streaming potential data appear to relax to the reference sample behavior after a period of time of water exposure. Combination of the zeta-potential measurements with AFM investigations support the idea that atomically smooth surfaces exhibit lower IEPs, while rougher surfaces (roughness on the order of nanometers) result in higher IEPs compared to reference samples. Two supplementary investigations resulted in either surprising or ambiguous results. On very rough surfaces (roughness on the order of micrometers) the IEP lowered compared to the reference sample with nanometer-scale roughness and transient behavior of the rough surfaces was observed. Furthermore, differences in the IEP as obtained from streaming potential and static colloid adhesion measurements may suggest that hydrodynamics play a role in streaming potential experiments. We finally relate surface diffraction data from previous studies to possible interpretations of our electrokinetic data to corroborate the presence of a water film that can explain the low IEP. Calculations show that the surface diffraction data are in line with the presence of a water film, however, they do not allow to unambiguously resolve critical features of this film which might explain the observed surface chemical characteristics like the dangling OH-bond reported in sum frequency generation studies. A broad literature review on properties of related surfaces shows that the presence of such water films could in many cases affect the interfacial properties. Persistence or not of the water film can be crucial. The presence of the water film can in principle affect important processes like ice-nucleation, wetting behavior, electric charging, etc.
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21
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Strokova NE, Ivanov AS, Savilov SV, Kasyanov MM, Desyatov AV, Lunin VV. Specific features of the adsorption of chlorinated methanes and water on carbon nanotubes and alumina. Russ Chem Bull 2017. [DOI: 10.1007/s11172-017-1921-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Yusoff ARBM, Nazeeruddin MK. Organohalide Lead Perovskites for Photovoltaic Applications. J Phys Chem Lett 2016; 7:851-66. [PMID: 26885884 DOI: 10.1021/acs.jpclett.5b02893] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Perovskite solar cells have recently exhibited a significant leap in efficiency due to their broad absorption, high optical absorption coefficient, very low exciton binding energy, long carrier diffusion lengths, efficient charge collection, and very high open-circuit potential, similar to that of III-IV semiconductors. Unlike silicon solar cells, perovskite solar cells can be developed from a variety of low-temperature solutions processed from inexpensive raw materials. When the perovskite absorber film formation is optimized using solvent engineering, a power conversion efficiency of over 21% has been demonstrated, highlighting the unique photovoltaic properties of perovskite materials. Here, we review the current progress in perovskite solar cells and charge transport materials. We highlight crucial challenges and provide a summary and prospects.
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Affiliation(s)
- Abd Rashid Bin Mohd Yusoff
- Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne , CH-1951 Sion, Switzerland
- Advanced Display Research Center, Department of Information Display, Kyung Hee University , Dongdaemoon-gu, 130-701 Seoul, Korea
| | - Mohammad Khaja Nazeeruddin
- Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne , CH-1951 Sion, Switzerland
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23
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Li Z, Zhang J, Fu P, Cui Z, Pang X, Liu M, Zhao Q. An unconventional route to fabricate highly pure α-Al2O3 nanocrystals with tunable surface chemistry based on a semi-aromatic polyamide with pyridine rings as a functional matrix. RSC Adv 2016. [DOI: 10.1039/c6ra19354d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Highly pure α-Al2O3 colloidal nanocrystals with tunable surface chemistry and dimensions were fabricated using semi-aromatic polyamide (PA6Py) with pyridine rings as a functional matrix.
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Affiliation(s)
- Zhaopeng Li
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Junle Zhang
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Peng Fu
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Zhe Cui
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Xinchang Pang
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Minying Liu
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Qingxiang Zhao
- School of Materials Science and Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
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24
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Lützenkirchen J, Heberling F, Supljika F, Preocanin T, Kallay N, Johann F, Weisser L, Eng PJ. Structure–charge relationship – the case of hematite (001). Faraday Discuss 2015; 180:55-79. [DOI: 10.1039/c4fd00260a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We present a multidisciplinary study on the hematite (001)–aqueous solution interface, in particular the relationship between surface structure (studiedviasurface diffraction in a humid atmosphere) and the macroscopic charging (studiedviasurface- and zeta-potential measurements in electrolyte solutions as a function of pH). Upon aging in water changes in the surface structure are observed, that are accompanied by drastic changes in the zeta-potential. Surprisingly the surface potential is not accordingly affected. We interpret our results by increasing hydration of the surface with time and enhanced reactivity of singly-coordinated hydroxyl groups that cause the isoelectric point of the surface to shift to values that are reminiscent of those typically reported for hematite particles. In its initial stages after preparation the hematite surface is very flat and only weakly hydrated. Our model links the entailing weak water structure with the observed low isoelectric point reminiscent of hydrophobic surfaces. The absence of an aging effect on the surface potentialvs.pH curves is interpreted as domination of the surface potential by the doubly coordinated hydroxyls, which are present on both surfaces.
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Affiliation(s)
- Johannes Lützenkirchen
- Institut für Nukleare Entsorgung
- Karlsruhe Institut für Technologie
- 76021 Karlsruhe
- Germany
| | - Frank Heberling
- Institut für Nukleare Entsorgung
- Karlsruhe Institut für Technologie
- 76021 Karlsruhe
- Germany
| | - Filip Supljika
- Laboratory of Physical Chemistry
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- 10001 Zagreb
| | - Tajana Preocanin
- Laboratory of Physical Chemistry
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- 10001 Zagreb
| | - Nikola Kallay
- Laboratory of Physical Chemistry
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- 10001 Zagreb
| | - Florian Johann
- Oxford Instruments GmbH, c/o Asylum Research
- DE-68259 Mannheim
- Germany
| | - Ludger Weisser
- Oxford Instruments GmbH, c/o Asylum Research
- DE-68259 Mannheim
- Germany
| | - Peter J. Eng
- GeoSoilEnviroCars
- University of Chicago
- Chicago
- USA
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25
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Malki A, Mekhalif Z, Detriche S, Fonder G, Boumaza A, Djelloul A. Calcination products of gibbsite studied by X-ray diffraction, XPS and solid-state NMR. J SOLID STATE CHEM 2014. [DOI: 10.1016/j.jssc.2014.03.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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26
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Lee SY, Welbourn R, Clarke SM, Skoda MW, Clifton L, Zarbakhsh A. Adsorption of sodium hexanoate on α-alumina. J Colloid Interface Sci 2013; 407:348-53. [DOI: 10.1016/j.jcis.2013.06.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Revised: 06/10/2013] [Accepted: 06/11/2013] [Indexed: 10/26/2022]
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27
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Lützenkirchen J. Specific ion effects at two single-crystal planes of sapphire. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:7726-7734. [PMID: 23705881 DOI: 10.1021/la401509y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Experimental results on specific ion effects at the c- and r- single-crystal planes of sapphire obtained by zeta-potential measurements at pH 5.8 are reported. Both crystal planes have negative electrokinetic charge at pH 5.8 and their intrinsic isoelectric points are found close to pH 4. The water structure "making" surface (i.e., r-plane, based on surface diffraction and surface complexation modeling) causes cation specificity in the order Li(+) > Na(+) > K(+) > Rb(+) > Cs(+) in chloride systems while no anion sensitivity occurs in sodium systems (Cl(-), NO3(-), and BrO3(-)) as expected. The cation series concurs with the simple idea of structure making ions being adsorbed more strongly on structure making surfaces and also concurs with the sequence found for particulate alumina for the cation series in nitrate systems. On the structure breaking basal plane (i.e., c-plane, again based on surface diffraction and surface complexation modeling), no cation specific effects are observed in chloride systems, but the structure breaking properties are retrieved in the cation series in nitrate systems. Surprisingly, anion specificity is observed on sapphire-c. Furthermore, the chloride ion shows unexpected behavior that suggests chloride adsorption onto the negatively charged surface. Based on these experimental observations in conjunction with generic results from published MD simulations, the c-plane sapphire aqueous electrolyte interface is a nonpolar surface with negative charge. The nonpolarity finds repercussions in the weak water ordering and the observed ion specific effects. The low isoelectric points of the cuts cannot be explained by the respective surface chemistries of the ideal surfaces. Relation to "inert" surfaces and concomitant dominance of hydroxide ion adsorption is a possible explanation for the low isoelectric points of both cuts. The reported ion specific effects occur at concentrations below 10 mM. Overall, the results support the idea that ion specific effects are largely governed by surface hydration.
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Affiliation(s)
- J Lützenkirchen
- Institut für Nukleare Entsorgung - INE, Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
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28
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Zarzycki P, Chatman S, Preočanin T, Rosso KM. Electrostatic potential of specific mineral faces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:7986-7990. [PMID: 21650199 DOI: 10.1021/la201369g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Reaction rates of environmental processes occurring at hydrated mineral surfaces are in part controlled by the electrostatic potential that develops at the interface. This potential depends on the structure of exposed crystal faces as well as the pH and the type of ions and their interactions with these faces. Despite its importance, experimental methods for determining fundamental electrostatic properties of specific crystal faces such as the point of zero charge are few. Here we show that this information may be obtained from simple, cyclic potentiometric titration using a well-characterized single-crystal electrode exposing the face of interest. The method exploits the presence of a hysteresis loop in the titration measurements that allows the extraction of key electrostatic descriptors using the Maxwell construction. The approach is demonstrated for hematite (α-Fe(2)O(3)) (001), and thermodynamic proof is provided for the resulting estimate of its point of zero charge. Insight gained from this method will aid in predicting the fate of migrating contaminants, mineral growth/dissolution processes, and mineral-microbiological interactions and in testing surface complexation theories.
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Affiliation(s)
- P Zarzycki
- Pacific Northwest National Laboratory, Richland, Washington, USA.
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29
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Yourdkhani A, Caruntu G. Highly ordered transition metal ferrite nanotube arrays synthesized by template-assisted liquid phase deposition. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm04441e] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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