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Zuo M, Song Q, Hajiyeva N, Lerch H, Bolten J, Plachetka U, Lemme MC, Schönherr H. Effect of Particle Size on the Orientation and Order of Assemblies of Functionalized Microscale Cubes Formed at the Water/Air Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023. [PMID: 37310799 DOI: 10.1021/acs.langmuir.3c00518] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The impact of the particle size and wettability on the orientation and order of assemblies obtained by self-organization of functionalized microscale polystyrene cubes at the water/air interface is reported. An increase in the hydrophobicity of 10- and 5-μm-sized self-assembled monolayer-functionalized polystyrene cubes, as assessed by independent water contact angle measurements, led to a change of the preferred orientation of the assembled cubes at the water/air interface from face-up to edge-up and further to vertex-up, irrespective of microcube size. This tendency is consistent with our previous studies with 30-μm-sized cubes. However, the transitions among these orientations and the capillary force-induced structures, which change from flat plate to tilted linear and further to close-packed hexagonal arrangements, were observed to shift to larger contact angles for smaller cube size. Likewise, the order of the formed aggregates decreased significantly with decreasing cube size, which is tentatively attributed to the small ratio of inertial force to capillary force for smaller cubes in disordered aggregates, which results in more difficulties to reorient in the stirring process. Experiments with small fractions of larger cubes added to the water/air interface increased the order of smaller homo-aggregates to values similar to neat 30 μm cube assemblies. Hence, collisions of larger cubes or aggregates are shown to play a decisive role in breaking metastable structures to approach a global energy minimum assembly.
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Affiliation(s)
- Mengdi Zuo
- Physical Chemistry I and Research Center of Micro and Nanochemistry and (Bio)Technology (Cμ), Department of Chemistry and Biology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Qimeng Song
- Physical Chemistry I and Research Center of Micro and Nanochemistry and (Bio)Technology (Cμ), Department of Chemistry and Biology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Nigar Hajiyeva
- Physical Chemistry I and Research Center of Micro and Nanochemistry and (Bio)Technology (Cμ), Department of Chemistry and Biology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Holger Lerch
- AMO GmbH, Gesellschaft für Angewandte Mikro- und Optoelektronik mbH, Otto-Blumenthal-Straße 25, 52074 Aachen, Germany
| | - Jens Bolten
- AMO GmbH, Gesellschaft für Angewandte Mikro- und Optoelektronik mbH, Otto-Blumenthal-Straße 25, 52074 Aachen, Germany
| | - Ulrich Plachetka
- AMO GmbH, Gesellschaft für Angewandte Mikro- und Optoelektronik mbH, Otto-Blumenthal-Straße 25, 52074 Aachen, Germany
| | - Max C Lemme
- AMO GmbH, Gesellschaft für Angewandte Mikro- und Optoelektronik mbH, Otto-Blumenthal-Straße 25, 52074 Aachen, Germany
- Chair of Electronic Devices, RWTH Aachen University, Otto-Blumenthal-Straße 2, 52074 Aachen, Germany
| | - Holger Schönherr
- Physical Chemistry I and Research Center of Micro and Nanochemistry and (Bio)Technology (Cμ), Department of Chemistry and Biology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
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2
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Song Q, Ogiemwonyi CE, Zuo M, Schönherr H. Investigation of the Orientation and Assembly of Functionalized Microcubes at the Oil-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:7388-7395. [PMID: 37192464 DOI: 10.1021/acs.langmuir.3c00533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The dependence of the preferred orientation of polystyrene microcubes on surface hydrophobicity at the water/hexadecane interface is reported. Similar to the water/air interfaces, the microcubes were shown to reside at the water/hexadecane interface with three distinct orientations: face-up, edge-up, and vertex-up. Concomitantly, ordered aggregates with flat plate, tilted linear, and close-packed hexagonal structures were formed, driven by capillary force. With increasing the hydrophobicity of five sides of the cubes, the preferential microcube orientation at the water/hexadecane interface changed sequentially from face-up to edge-up, to vertex-up, then back to edge-up, and to face-up. This dependence of the preferential microcube orientation on surface hydrophobicity at the water/hexadecane interface differs from that observed at the water/air interface, where the preferential orientation changed only from face-up to edge-up, then to vertex-up, as surface hydrophobicity increased. In addition, preformed microcube assemblies at the water/air interface could be dynamically reconfigured by replacing the air phase with hexadecane under stirring.
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Affiliation(s)
- Qimeng Song
- Physical Chemistry I and Research Center of Micro and Nanochemistry and (Bio)Technology (Cμ), Department of Chemistry and Biology, University of Siegen, Adolf-Reichwein-Str. 2, Siegen 57076, Germany
| | - Christian Edorodion Ogiemwonyi
- Physical Chemistry I and Research Center of Micro and Nanochemistry and (Bio)Technology (Cμ), Department of Chemistry and Biology, University of Siegen, Adolf-Reichwein-Str. 2, Siegen 57076, Germany
| | - Mengdi Zuo
- Physical Chemistry I and Research Center of Micro and Nanochemistry and (Bio)Technology (Cμ), Department of Chemistry and Biology, University of Siegen, Adolf-Reichwein-Str. 2, Siegen 57076, Germany
| | - Holger Schönherr
- Physical Chemistry I and Research Center of Micro and Nanochemistry and (Bio)Technology (Cμ), Department of Chemistry and Biology, University of Siegen, Adolf-Reichwein-Str. 2, Siegen 57076, Germany
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3
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Shi WX, Ren RZ, Cheng Y, Zeng FG, Guo XW, Zhang ZM. Graphene Oxide-Mediated Synthesis of Ultrathin Co-MOL for CO 2 Photoreduction. Inorg Chem 2023; 62:4476-4484. [PMID: 36893257 DOI: 10.1021/acs.inorgchem.2c04136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Abstract
Metal-organic framework (MOF) materials have broad application prospects in catalysis because of their ordered structure and molecular adjustability. However, the large volume of bulky MOF usually leads to insufficient exposure of the active sites and the obstruction of charge/mass transfer, which greatly limits their catalytic performance. Herein, we developed a simple graphene oxide (GO) template method to fabricate ultrathin Co-metal-organic layer (2.0 nm) on reduced GO (Co-MOL@r-GO). The as-synthesized hybrid material Co-MOL@r-GO-2 exhibits highly efficient photocatalytic performance for CO2 reduction, and the CO yield can reach as high as 25,442 μmol/gCo-MOL, which is over 20 times higher than that of the bulky Co-MOF. Systematic investigations demonstrate that GO can act as a template for the synthesis of the ultrathin Co-MOL with more active sites and can be used as the electron transport medium between the photosensitizer and the Co-MOL to enhance the catalytic activity for CO2 photoreduction.
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Affiliation(s)
- Wen-Xiong Shi
- Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China
| | - Ru-Zhen Ren
- Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China
| | - Yao Cheng
- Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China
| | - Fu-Gui Zeng
- Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China
| | - Xiang-Wei Guo
- College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, P. R. China
| | - Zhi-Ming Zhang
- Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China
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4
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Zhou Y, Tang TY, Lee BHJ, Arya G. Tunable Orientation and Assembly of Polymer-Grafted Nanocubes at Fluid-Fluid Interfaces. ACS NANO 2022; 16:7457-7470. [PMID: 35452220 DOI: 10.1021/acsnano.1c10416] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Self-assembly of faceted nanoparticles is a promising route for fabricating nanomaterials; however, achieving low-dimensional assemblies of particles with tunable orientations is challenging. Here, we demonstrate that trapping surface-functionalized faceted nanoparticles at fluid-fluid interfaces is a viable approach for controlling particle orientation and facilitating their assembly into unique one- and two-dimensional superstructures. Using molecular dynamics simulations of polymer-grafted nanocubes in a polymer bilayer along with a particle-orientation classification method we developed, we show that the nanocubes can be induced into face-up, edge-up, or vertex-up orientations by tuning the graft density and differences in their miscibility with the two polymer layers. The orientational preference of the nanocubes is found to be governed by an interplay between the interfacial area occluded by the particle, the difference in interactions of the grafts with the two layers, and the stretching and intercalation of grafts at the interface. The resulting orientationally constrained nanocubes are then shown to assemble into a variety of unusual architectures, such as rectilinear strings, close-packed sheets, bilayer ribbons, and perforated sheets, which are difficult to obtain using other assembly methods. Our work thus demonstrates a versatile strategy for assembling freestanding arrays of faceted nanoparticles with possible applications in plasmonics, optics, catalysis, and membranes, where precise control over particle orientation and position is required.
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Affiliation(s)
- Yilong Zhou
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, United States
| | - Tsung-Yeh Tang
- Department of NanoEngineering, University of California, San Diego, La Jolla, California 92093, United States
| | - Brian Hyun-Jong Lee
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, United States
| | - Gaurav Arya
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, United States
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Lee YH, Shi W, Yang Y, Kao YC, Lee HK, Chu R, Pang YL, Lay CL, Li S, Ling XY. Modulating Orientational Order to Organize Polyhedral Nanoparticles into Plastic Crystals and Uniform Metacrystals. Angew Chem Int Ed Engl 2020; 59:21183-21189. [PMID: 32767617 DOI: 10.1002/anie.202009941] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Indexed: 01/11/2023]
Abstract
In nanoparticle self-assembly, the current lack of strategy to modulate orientational order creates challenges in isolating large-area plastic crystals. Here, we achieve two orientationally distinct supercrystals using one nanoparticle shape, including plastic crystals and uniform metacrystals. Our approach integrates multi-faceted Archimedean polyhedra with molecular-level surface polymeric interactions to tune nanoparticle orientational order during self-assembly. Experiments and simulations show that coiled surface polymer chains limit interparticle interactions, creating various geometrical configurations among Archimedean polyhedra to form plastic crystals. In contrast, brush-like polymer chains enable molecular interdigitation between neighboring particles, favoring consistent particle configurations and result in uniform metacrystals. Our strategy enhances supercrystal diversity for polyhedra comprising multiple nondegenerate facets.
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Affiliation(s)
- Yih Hong Lee
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Wenxiong Shi
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin, 300387, P. R. China
| | - Yijie Yang
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Ya-Chuan Kao
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Hiang Kwee Lee
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Rongrong Chu
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin, 300387, P. R. China
| | - Yee Ling Pang
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Chee Leng Lay
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.,Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
| | - Shuzhou Li
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Xing Yi Ling
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
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Lee YH, Shi W, Yang Y, Kao Y, Lee HK, Chu R, Pang YL, Lay CL, Li S, Ling XY. Modulating Orientational Order to Organize Polyhedral Nanoparticles into Plastic Crystals and Uniform Metacrystals. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202009941] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Yih Hong Lee
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Wenxiong Shi
- State Key Laboratory of Separation Membranes and Membrane Processes School of Materials Science and Engineering Tiangong University Tianjin 300387 P. R. China
| | - Yijie Yang
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Ya‐Chuan Kao
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Hiang Kwee Lee
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Rongrong Chu
- State Key Laboratory of Separation Membranes and Membrane Processes School of Materials Science and Engineering Tiangong University Tianjin 300387 P. R. China
| | - Yee Ling Pang
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Chee Leng Lay
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
- Institute of Materials Research and Engineering Agency for Science, Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis, #08-03 Singapore 138634 Singapore
| | - Shuzhou Li
- School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore
| | - Xing Yi Ling
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
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7
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Zhang Q, Ma D, Wen D, Wang C, Bai X, Wang S. Novel Conjugated Side Chain Fluorinated Polymers Based on Fluorene for Light-Emitting and Ternary Flash Memory Devices. ChemistryOpen 2019; 8:1267-1275. [PMID: 31637150 PMCID: PMC6797500 DOI: 10.1002/open.201900210] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 09/16/2019] [Indexed: 11/16/2022] Open
Abstract
Three novel conjugated polymers based on 9,9'-dioctylfluorene unit and isoindolo[2,1-a]benzimidazol-11-one with different fluorine substituents (0, 2 and 4) were synthesized. PLED and resistive memory devices based on these polymers were prepared consequently. PLED based on four-fluorinated polymer showed the highest maximum brightness of 3192 cd m-2 with almost 5-fold increase of current efficiency 8-fold increase of external quantum efficiency compared to that of the other two, and all the PLEDs exhibited good emission stability with no noticeable change of electroluminescence even under high voltage of 10 V. The memory device of doubly-fluorinated polymer exhibited ternary flash behavior with threshold voltages below -2.5 V, while device of four-fluorinated polymer possessed ON/OFF current ratio above 104. Impact of fluorine substitutions on the performance of devices were briefly investigated. The results revealed that the improvement of device performance might not scale with the increasing number of fluorine substitutions, and the four-fluorine-substituted polymer and doubly-fluorinated polymer could be encouraging materials for applications of PLED and resistive memory device and worth of further design of other new polymer systems.
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Affiliation(s)
- Qian Zhang
- School of Chemistry Engineering and Materials ScienceHeilongjiang University74 Xuefu RoadNangang DistrictHarbinChina150080
| | - Dongge Ma
- Institute of Polymer MaterialsSouth China University of Technology381 Wushan RoadTianhe DistrictGuangzhouChina510641
| | - Dianzhong Wen
- Key Laboratories of Senior-education for Electronic EngineeringHeilongjiang University74 Xuefu RoadNangang DistrictHarbinChina150080
| | - Cheng Wang
- School of Chemistry Engineering and Materials ScienceHeilongjiang University74 Xuefu RoadNangang DistrictHarbinChina150080
| | - Xuduo Bai
- School of Chemistry Engineering and Materials ScienceHeilongjiang University74 Xuefu RoadNangang DistrictHarbinChina150080
| | - Shuhong Wang
- School of Chemistry Engineering and Materials ScienceHeilongjiang University74 Xuefu RoadNangang DistrictHarbinChina150080
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8
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Song Q, Schönherr H. Control of Orientation, Formation of Ordered Structures, and Self-Sorting of Surface-Functionalized Microcubes at the Air-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:6742-6751. [PMID: 31039608 DOI: 10.1021/acs.langmuir.9b00792] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The dependence of the orientation of microscale PS cubes, which are surface functionalized on only five faces, at the water/air interface and the ordered aggregates formed by capillary force assembly are reported. Depending on the wettability of the faces, the cubes were shown to adopt a preferred orientation that changes with decreasing wettability from face up to edge up and further to vertex up. Concomitantly, stable aggregates with different structures were formed by capillary force self-assembly. The unmodified bottom face of the cubes was localized by fluorescence labeling. Finally, self-sorting of differently surface functionalized microcubes was realized for the first time, due to the stronger capillary interactions of quadrupole-quadrupole and hexapole-hexapole interactions compared to quadrupole-hexapole interaction.
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Affiliation(s)
- Qimeng Song
- Physical Chemistry I and Research Center of Micro and Nanochemistry and Engineering ( Cμ), Department of Chemistry and Biology , University of Siegen , Adolf-Reichwein-Str. 2 , 57076 , Siegen , Germany
| | - Holger Schönherr
- Physical Chemistry I and Research Center of Micro and Nanochemistry and Engineering ( Cμ), Department of Chemistry and Biology , University of Siegen , Adolf-Reichwein-Str. 2 , 57076 , Siegen , Germany
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Song Q, Steuber M, Druzhinin SI, Schönherr H. Tailored Combinatorial Microcompartments through the Self‐Organization of Microobjects: Assembly, Characterization, and Cell Studies. Angew Chem Int Ed Engl 2019; 58:5246-5250. [DOI: 10.1002/anie.201814076] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 02/09/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Qimeng Song
- Physical Chemistry I and Research Center of Micro and Nano-chemistry and Engineering (Cμ)University of Siegen Adolf-Reichwein-Straße 2 57076 Siegen Germany
| | - Marc Steuber
- Physical Chemistry I and Research Center of Micro and Nano-chemistry and Engineering (Cμ)University of Siegen Adolf-Reichwein-Straße 2 57076 Siegen Germany
| | - Sergey I. Druzhinin
- Physical Chemistry I and Research Center of Micro and Nano-chemistry and Engineering (Cμ)University of Siegen Adolf-Reichwein-Straße 2 57076 Siegen Germany
| | - Holger Schönherr
- Physical Chemistry I and Research Center of Micro and Nano-chemistry and Engineering (Cμ)University of Siegen Adolf-Reichwein-Straße 2 57076 Siegen Germany
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Song Q, Steuber M, Druzhinin SI, Schönherr H. Tailored Combinatorial Microcompartments through the Self‐Organization of Microobjects: Assembly, Characterization, and Cell Studies. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201814076] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Qimeng Song
- Physical Chemistry I and Research Center of Micro and Nano-chemistry and Engineering (Cμ)University of Siegen Adolf-Reichwein-Straße 2 57076 Siegen Germany
| | - Marc Steuber
- Physical Chemistry I and Research Center of Micro and Nano-chemistry and Engineering (Cμ)University of Siegen Adolf-Reichwein-Straße 2 57076 Siegen Germany
| | - Sergey I. Druzhinin
- Physical Chemistry I and Research Center of Micro and Nano-chemistry and Engineering (Cμ)University of Siegen Adolf-Reichwein-Straße 2 57076 Siegen Germany
| | - Holger Schönherr
- Physical Chemistry I and Research Center of Micro and Nano-chemistry and Engineering (Cμ)University of Siegen Adolf-Reichwein-Straße 2 57076 Siegen Germany
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Anjali TG, Basavaraj MG. Shape-Anisotropic Colloids at Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3-20. [PMID: 29986588 DOI: 10.1021/acs.langmuir.8b01139] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Research in the 1980s demonstrated the formation of monolayers of particles achieved by interfacial particle trapping as a model system for investigating colloids in two dimensions. Since then, microscopy visualization of two-dimensional particle monolayers and quantification of the microstructure have led to significant fundamental understanding of a number of phenomena such as crystallization, freezing and melting transitions, dislocation dynamics, aggregation kinetics, and others. On the application front, particles at curved interfaces, as often the case in particle-stabilized emulsions and foams, have received considerable attention in the last few decades. The growing interest in the search for novel particles and new strategies to effect emulsion stabilization stems from their application in several disciplines. Moreover, particle-stabilized Pickering emulsions and foams can also be used to derive a number of advanced functional materials. Compared to several accounts of research on spherical colloids at fluid-fluid interfaces, investigations of the behavior of shape-anisotropic particles at interfaces, albeit receiving considerable attention in recent years, are still in a nascent stage. The objective of this feature article is to highlight our recent work in this area. In particular, the adsorption of shape-anisotropic particles to interfaces, wetting behavior, interfacial self-assembly, the response of nonspherical-particle-coated interfaces to compression and shear, and their ability to stabilize emulsions are discussed.
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Affiliation(s)
- Thriveni G Anjali
- Polymer Engineering and Colloid Science (PECS) Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600 036 , India
| | - Madivala G Basavaraj
- Polymer Engineering and Colloid Science (PECS) Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600 036 , India
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