1
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Choi YH, Lee J, Amstad E, Kim SH. Influence of Sphericity on Surface Termination of Icosahedral Colloidal Clusters. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2309512. [PMID: 38072633 DOI: 10.1002/smll.202309512] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 11/16/2023] [Indexed: 05/18/2024]
Abstract
Colloids self-organize into icosahedral clusters composed of a Mackay core and an anti-Mackay shell under spherical confinement to minimize the free energy. This study explores the variation of surface arrangements of colloids in icosahedral clusters, focusing on the determining factors behind the surface arrangement. To efficiently assemble particles in emulsion droplets, droplet-to-droplet osmotic extraction from particle-laden droplets to salt-containing droplets is used, where the droplets are microfluidically prepared to guarantee a high size uniformity. The icosahedral clusters are optimally produced during a 24-h consolidation period at a 0.04 m salt concentration. The findings reveal an increase in the number of particle layers from 10 to 15 in the icosahedral clusters as the average number of particles increases from 3300 to 11 000. Intriguingly, the number of layers in the anti-Mackay shells, or surface termination, appears to more strongly depend on the sphericity of the clusters than on the deviation in the particle count from an ideal icosahedral cluster. This result suggests that the sphericity of the outermost layer, formed by the late-stage rearrangement of particles to form an anti-Mackay shell near the droplet interface, may play a pivotal role in determining the surface morphology to accommodate a spherical interface.
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Affiliation(s)
- Ye Hun Choi
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Jiwoo Lee
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Esther Amstad
- Institute of Materials, École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland
| | - Shin-Hyun Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
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2
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Kim JH, Kim JB, Kim SH. Structural Color Inks Containing Photonic Microbeads for Direct Writing. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38593432 DOI: 10.1021/acsami.4c01224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
Printing structurally colored patterns is of great importance for providing customized graphics for various purposes. Although a direct writing technique has been developed, the use of colloidal dispersions as photonic inks requires delicate printing conditions and restricts the mechanical and optical properties of printed patterns. In this work, we produce elastic photonic microbeads through scalable bulk emulsification and formulate photonic inks containing microbeads for direct writing. To produce the microbeads, a photocurable colloidal dispersion is emulsified into a highly concentrated sucrose solution via vortexing, which results in spherical emulsion droplets with a relatively narrow size distribution. The microbeads are produced by photopolymerization and are then suspended in urethane acrylate resin at volume fractions of 0.35-0.45. The photonic inks retain high color saturation of the microbeads and offer enhanced printability and dimensional control on various target substrates including fabrics, papers, and even skins. Importantly, the printed graphics show high mechanical stability as the elastic microbeads are embedded in the polyurethane matrix. Moreover, the colors show a wide viewing angle and low-angle dependency due to the optical isotropy of individual microbeads and light refraction at the air-matrix interface. We postulate that this versatile direct writing technique is potentially useful for structural color coating and printing on the surfaces of arbitrary 3D objects.
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Affiliation(s)
- Jong Hyun Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Jong Bin Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Shin-Hyun Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
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3
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Li N, Li J, Qing L, Ma S, Li Y, Li B. Self-assembly of colloids with competing interactions confined in spheres. SOFT MATTER 2024; 20:304-314. [PMID: 38050746 DOI: 10.1039/d3sm01227a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
At low temperatures, colloidal particles with short-range attractive and long-range repulsive interactions can form various periodic microphases in bulk. In this paper, we investigate the self-assembly behaviour of colloids with competing interactions under spherical confinement by conducting molecular dynamics simulations. We find that the cluster, mixture, cylindrical, perforated lamellar and lamellar structures can be obtained, but the details of the ordered structures are different from those in bulk systems. Interestingly, the system tends to form more perforated structures when confined in smaller spheres. The mechanism behind this phenomenon is driven by the relationship between the energy of the ordered structures and the bending of the confinement wall, which is different from the mechanism in copolymer systems.
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Affiliation(s)
- Ningyi Li
- School of Physics, Key Laboratory of Functional Polymer Materials of Ministry of Education, Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300071, China.
| | - Junhong Li
- School of Physics, Key Laboratory of Functional Polymer Materials of Ministry of Education, Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300071, China.
| | - Lijingting Qing
- School of Physics, Key Laboratory of Functional Polymer Materials of Ministry of Education, Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300071, China.
| | - Shicheng Ma
- School of Physics, Key Laboratory of Functional Polymer Materials of Ministry of Education, Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300071, China.
| | - Yao Li
- School of Physics, Key Laboratory of Functional Polymer Materials of Ministry of Education, Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300071, China.
| | - Baohui Li
- School of Physics, Key Laboratory of Functional Polymer Materials of Ministry of Education, Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300071, China.
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4
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Nam SK, Amstad E, Kim SH. Hydrogel-Encased Photonic Microspheres with Enhanced Color Saturation and High Suspension Stability. ACS APPLIED MATERIALS & INTERFACES 2023; 15:58761-58769. [PMID: 38084724 DOI: 10.1021/acsami.3c14364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Regular arrays of colloidal particles can produce striking structural colors without the need for any chemical pigments. Regular arrays of colloidal particles can be processed into microparticles via emulsion templates for use as structural colorants. Photonic microparticles, however, suffer from intense incoherent scattering and lack of suspension stability. We propose a microfluidic technique to generate hydrogel-shelled photonic microspheres that display enhanced color saturation and suspension stability. We created these microspheres using oil-in-water-in-oil (O/W/O) double-emulsion droplets with well-defined dimensions with a capillary microfluidic device. The inner oil droplet contains silica particles in a photocurable monomer, while the middle water droplet carries the hydrogel precursor. Within the inner oil droplet, silica particles arrange into crystalline arrays due to solvation-layer-induced interparticle repulsion. UV irradiation solidifies the inner photonic core and the outer hydrogel shell. The hydrogel shell reduces white scattering and enhances the suspension stability in water. Notably, the hydrogel precursor in the water droplet aids in maintaining the solvation layer, resulting in enhanced crystallinity and richer colors compared with microspheres from O/W single-emulsion droplets. These hydrogel-encased photonic microspheres show promise as structural colorants in water-based inks and polymer composites.
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Affiliation(s)
- Seong Kyeong Nam
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Esther Amstad
- Institute of Materials, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland
| | - Shin-Hyun Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
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5
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Chen N, Wang Y, Deng Z. DNA-Condensed Plasmonic Supraballs Transparent to Molecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:14053-14062. [PMID: 37725679 DOI: 10.1021/acs.langmuir.3c01860] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
DNA nanotechnology offers an unrivaled programmability of plasmonic nanoassemblies based on encodable Watson-Crick basepairing. However, it is very challenging to build rigidified three-dimensional supracolloidal assemblies with strong electromagnetic coupling and a self-confined exterior shape. We herein report an alternative strategy based on a DNA condensation reaction to make such structures. Using DNA-grafted gold nanoparticles as building blocks and metal ions with suitable phosphate affinities as abiological DNA-bonding agents, a seedless growth of spheroidal supraparticles is realized via metal-ion-induced DNA condensation. Some governing rules are disclosed in this process, including kinetic and thermodynamic effects stemming from electrostatic and coordinative forces with different interaction ranges. The supraballs are tailorable by adjusting the volumetric ratio between DNA grafts and gold cores and by overgrowing extra gold layers toward tunable plasmon coupling. Various appealing and highly desirable properties are achieved for the resulting metaballs, including (i) chemical reversibility and fixation ability, (ii) stability against denaturant, salt, and molecular adsorbates, (iii) enriched and continuously tunable plasmonic hotspots, (iv) permeability to small guest molecules and antifoulingness against protein contaminates, and (v) Raman-enhancing and photocatalytic activities. Innovative applications are thus foreseeable for this emerging class of meta-assemblies in contrast to what is achieved by DNA-basepaired ones.
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Affiliation(s)
- Nuo Chen
- Center for Bioanalytical Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yueliang Wang
- Center for Bioanalytical Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Zhaoxiang Deng
- Center for Bioanalytical Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China
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6
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Vu-Minh T, Dao-Hong A, Bui-Bich P, Nguyen-Tran-Thanh N, Tran-Manh C, Tran-Phan-Thuy L, Doan-Thi H, Luc-Huy H, Pham-Van H. Evaporation-driven assembly of colloidal nanoparticles into clusters: A dissipative particle dynamics study. Phys Rev E 2023; 108:014602. [PMID: 37583241 DOI: 10.1103/physreve.108.014602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 06/20/2023] [Indexed: 08/17/2023]
Abstract
In this work we consider a simulation strategy for assembling Janus nanoparticles in oil-in-water emulsion droplets by evaporation based on the dissipative particle dynamics method. Our simple method reproduces all the observed cluster configurations that have been explored experimentally. In addition, the kinetic process of cluster formation is systematically investigated. We observe a structural transition from spherical packings to minimal second-moment configurations via visual inspection and a simple angle parameter. We reveal that the critical volume at which the transition occurs is a cubic function of the number of particles, N. Our approach also allows us to anticipate higher-order clusters, overcoming the limitations of the standard methods in the literature. Similarly to small N values, we find that for each N in the range of 16-39, all final clusters have a unique configuration.
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Affiliation(s)
- Tu Vu-Minh
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Anh Dao-Hong
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Phuong Bui-Bich
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Nam Nguyen-Tran-Thanh
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Cuong Tran-Manh
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Linh Tran-Phan-Thuy
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Hien Doan-Thi
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Hoang Luc-Huy
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
| | - Hai Pham-Van
- Department of Physics, Hanoi National University of Education, 136 Xuanthuy Road, Caugiay, Hanoi, Vietnam
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7
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Röhlig D, Kuhn E, Thränhardt A, Blaudeck T. Simultaneous occurrence and compensating effects of multi‐type disorder in two‐dimensional photonic structures. NANO SELECT 2023. [DOI: 10.1002/nano.202300021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023] Open
Affiliation(s)
- David Röhlig
- Technische Universität Chemnitz Institute of Physics Chemnitz Germany
| | - Eduard Kuhn
- Technische Universität Chemnitz Institute of Physics Chemnitz Germany
| | - Angela Thränhardt
- Technische Universität Chemnitz Institute of Physics Chemnitz Germany
| | - Thomas Blaudeck
- Center for Microtechnologies (ZfM) Technische Universität Chemnitz Chemnitz Germany
- Research Center for Materials, Architectures and Integration of Nanomembranes (MAIN) Technische Universität Chemnitz Chemnitz Germany
- Fraunhofer Institute for Electronic Nano Systems (ENAS) Chemnitz Germany
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8
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Kim YG, Park S, Kim SH. Centrifugation-Assisted Growth of Single-Crystalline Grains in Microcapsules. ACS NANO 2023; 17:2782-2791. [PMID: 36648203 DOI: 10.1021/acsnano.2c11071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Colloidal crystals have been tailored in a format of microspheres to use them as a building block to construct macroscopic photonic surfaces. However, the polycrystalline grains grown from the spherical surface usually exhibit low reflectivity. Although single-crystalline microspheres have been produced, it is difficult to control the crystal orientation. Here, we design spherical microcapsules with density anisotropy that contain single-crystalline grains along the heavy side. The microcapsules spontaneously align to have a heavy side down under the action of gravity and display a bright and uniform reflection color from the entire surface of the grains. Key to the success is the use of gentle centrifugal force to initiate nucleation and grow single-crystalline grains from the heavy side through depletion attraction. The microcapsules have density anisotropy due to the heterogeneity of the shell thickness, which causes them to self-align under centrifugation. At the same time, particles are accumulated on the heavy side, which produces many tiny grains on the heavy side immediately after the centrifugation. With controlled depletion attraction among particles, only a few grains survive during postincubation through Ostwald ripening, and one or a few giant single-crystalline grains are finally produced along the heavy side of each microcapsule.
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Affiliation(s)
- Young Geon Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon34141, Republic of Korea
| | - Sanghyuk Park
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon34141, Republic of Korea
| | - Shin-Hyun Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon34141, Republic of Korea
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9
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Shen S, Qin X, Feng H, Xie S, Yi Z, Jin M, Zhou G, Akinoglu EM, Mulvaney P, Shui L. Electro-Microfluidic Assembly Platform for Manipulating Colloidal Structures inside Water-in-Oil Emulsion Droplets. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2203341. [PMID: 36169113 PMCID: PMC9661862 DOI: 10.1002/advs.202203341] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 09/04/2022] [Indexed: 06/16/2023]
Abstract
Colloidal assembly is a key strategy in nature and artificial device. Hereby, an electromicrofluidic assembly platform (eMAP) is proposed and validated to achieve 3D colloidal assembly and manipulation within water droplets. The water-in-oil emulsion droplets autoposition in the eMAP driven by dielectrophoresis, where the (di)electrowetting effect induces droplet deformation, facilitating quadratic growth of the electric field in water droplet to achieve "far-field" dielectrophoretic colloidal assembly. Reconfigurable 3D colloidal configurations are observed and dynamically programmed via applied electric fields, colloidal properties, and droplet size. Binary and ternary colloidal assemblies in one droplet allow designable chemical and physical anisotropies for functional materials and devices. Integration of eMAP in high throughput enables mass production of functional microcapsules, and programmable optoelectronic units for display devices. This eMAP is a valuable reference for expanding fundamental and practical exploration of colloidal systems.
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Affiliation(s)
- Shitao Shen
- International Joint Laboratory of Optofluidic Technology and SystemNational Centre for International Research on Green OptoelectronicsSouth China Academy of Advanced Optoelectronics & School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou510006P. R. China
| | - Xiaofeng Qin
- International Joint Laboratory of Optofluidic Technology and SystemNational Centre for International Research on Green OptoelectronicsSouth China Academy of Advanced Optoelectronics & School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou510006P. R. China
| | - Haoqiang Feng
- International Joint Laboratory of Optofluidic Technology and SystemNational Centre for International Research on Green OptoelectronicsSouth China Academy of Advanced Optoelectronics & School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou510006P. R. China
| | - Shuting Xie
- International Joint Laboratory of Optofluidic Technology and SystemNational Centre for International Research on Green OptoelectronicsSouth China Academy of Advanced Optoelectronics & School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou510006P. R. China
| | - Zichuan Yi
- International Joint Laboratory of Optofluidic Technology and SystemNational Centre for International Research on Green OptoelectronicsSouth China Academy of Advanced Optoelectronics & School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou510006P. R. China
| | - Mingliang Jin
- International Joint Laboratory of Optofluidic Technology and SystemNational Centre for International Research on Green OptoelectronicsSouth China Academy of Advanced Optoelectronics & School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou510006P. R. China
- International Academy of Optoelectronics at ZhaoqingSouth China Normal UniversityZhaoqingGuangdong526238P. R. China
| | - Guofu Zhou
- International Joint Laboratory of Optofluidic Technology and SystemNational Centre for International Research on Green OptoelectronicsSouth China Academy of Advanced Optoelectronics & School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou510006P. R. China
- International Academy of Optoelectronics at ZhaoqingSouth China Normal UniversityZhaoqingGuangdong526238P. R. China
| | - Eser Metin Akinoglu
- International Academy of Optoelectronics at ZhaoqingSouth China Normal UniversityZhaoqingGuangdong526238P. R. China
- ARC Centre of Excellence in Exciton ScienceSchool of ChemistryUniversity of MelbourneParkvilleVIC3010Australia
| | - Paul Mulvaney
- ARC Centre of Excellence in Exciton ScienceSchool of ChemistryUniversity of MelbourneParkvilleVIC3010Australia
| | - Lingling Shui
- International Joint Laboratory of Optofluidic Technology and SystemNational Centre for International Research on Green OptoelectronicsSouth China Academy of Advanced Optoelectronics & School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou510006P. R. China
- Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and DevicesSchool of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou510006P. R. China
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10
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Kim YG, Park S, Kim SH. Designing photonic microparticles with droplet microfluidics. Chem Commun (Camb) 2022; 58:10303-10328. [PMID: 36043863 DOI: 10.1039/d2cc03629k] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Photonic materials with a periodic change of refractive index show unique optical properties through wavelength-selective diffraction and modulation of the optical density of state, which is promising for various optical applications. In particular, photonic structures have been produced in the format of microparticles using emulsion templates to achieve advanced properties and applications beyond those of a conventional film format. Photonic microparticles can be used as a building block to construct macroscopic photonic materials, and the individual microparticles can serve as miniaturized photonic devices. Droplet microfluidics enables the production of emulsion drops with a controlled size, composition, and configuration that serve as the optimal confining geometry for designing photonic microparticles. This feature article reviews the recent progress and current state of the art in the field of photonic microparticles, covering all aspects of microfluidic production methods, microparticle geometries, optical properties, and applications. Two distinct bottom-up approaches based on colloidal assembly and liquid crystals are, respectively, discussed and compared.
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Affiliation(s)
- Young Geon Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.
| | - Sihun Park
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.
| | - Shin-Hyun Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.
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11
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Huang S, Colosqui CE, Young YN, Stone HA. The effects of surface hydration on capillary adhesion under nanoscale confinement. SOFT MATTER 2022; 18:4786-4791. [PMID: 35708007 DOI: 10.1039/d2sm00473a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Nanoscale phenomena such as surface hydration and the molecular layering of liquids under strong nanoscale confinement play a critical role in liquid-mediated surface adhesion that is not accounted for by available models, which assume a uniform liquid density with or without considering surface forces and associated disjoining pressure effects. This work introduces an alternative theoretical description that via the potential of mean force (PMF) considers the strong spatial variation of the liquid number density under nanoscale confinement. This alternative description based on the PMF predicts a dual effect of surface hydration by producing: (i) strong spatial oscillations of the local liquid density and pressure and, more importantly, (ii) a configuration-dependent liquid-solid surface energy under nanoscale confinement. Theoretical analysis and molecular dynamics simulations for the case of an axisymmetric water bridge with nanoscale heights show that the latter hydration effect is critical for the accurate prediction of the surface energy and adhesion forces when a small volume of liquid is nanoscopically confined by two surfaces approaching contact.
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Affiliation(s)
- Sijia Huang
- Applied Mathematics & Statistics Department, Stony Brook University, Stony Brook, NY 11794, USA
| | - Carlos E Colosqui
- Applied Mathematics & Statistics Department, Stony Brook University, Stony Brook, NY 11794, USA
- Mechanical Engineering Department, Stony Brook University, Stony Brook, NY 11794, USA.
| | - Y-N Young
- Department of Mathematical Sciences, New Jersey Institute of Technology, Newark, NJ 07102, USA
| | - Howard A Stone
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
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12
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Lermusiaux L, Roach L, Baron A, Treguer-Delapierre M. Bottom-up synthesis of meta-atoms as building blocks in self-assembled metamaterials : Recent advances and perspectives. NANO EXPRESS 2022. [DOI: 10.1088/2632-959x/ac6889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
Meta-atoms interact with light in interesting ways and offer a large range of exciting properties. They exhibit optical properties inaccessible by natural atoms but their fabrication is notoriously difficult because of the precision required. In this perspective, we present the current research landscape in making meta-atoms, with a focus on the most promising self-assembly approaches and main challenges to overcome, for the development of materials with novel properties at optical frequencies.
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13
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Wang J, Liu Y, Bleyer G, Goerlitzer ESA, Englisch S, Przybilla T, Mbah CF, Engel M, Spiecker E, Imaz I, Maspoch D, Vogel N. Coloration in Supraparticles Assembled from Polyhedral Metal-Organic Framework Particles. Angew Chem Int Ed Engl 2022; 61:e202117455. [PMID: 35129874 PMCID: PMC9307011 DOI: 10.1002/anie.202117455] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Indexed: 11/15/2022]
Abstract
Supraparticles are spherical colloidal crystals prepared by confined self‐assembly processes. A particularly appealing property of these microscale structures is the structural color arising from interference of light with their building blocks. Here, we assemble supraparticles with high structural order that exhibit coloration from uniform, polyhedral metal–organic framework (MOF) particles. We analyse the structural coloration as a function of the size of these anisotropic building blocks and their internal structure. We attribute the angle‐dependent coloration of the MOF supraparticles to the presence of ordered, onion‐like layers at the outermost regions. Surprisingly, even though different shapes of the MOF particles have different propensities to form these onion layers, all supraparticle dispersions show well‐visible macroscopic coloration, indicating that local ordering is sufficient to generate interference effects.
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Affiliation(s)
- Junwei Wang
- Institute of Particle Technology, Friedrich-Alexander Universität Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Yang Liu
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC & The Barcelona Institute of Science and Technology, Bellaterra, 08193, Barcelona, Spain
| | - Gudrun Bleyer
- Institute of Particle Technology, Friedrich-Alexander Universität Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Eric S A Goerlitzer
- Institute of Particle Technology, Friedrich-Alexander Universität Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Silvan Englisch
- Institute of Micro- and Nanostructure Research (IMN), Center for Nanoanalysis and Electron Microscopy (CENEM), IZNF, Friedrich-Alexander Universität Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Thomas Przybilla
- Institute of Micro- and Nanostructure Research (IMN), Center for Nanoanalysis and Electron Microscopy (CENEM), IZNF, Friedrich-Alexander Universität Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Chrameh Fru Mbah
- Institute for Multiscale Simulation, IZNF, Friedrich-Alexander Universität Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Michael Engel
- Institute for Multiscale Simulation, IZNF, Friedrich-Alexander Universität Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Erdmann Spiecker
- Institute of Micro- and Nanostructure Research (IMN), Center for Nanoanalysis and Electron Microscopy (CENEM), IZNF, Friedrich-Alexander Universität Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Inhar Imaz
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC & The Barcelona Institute of Science and Technology, Bellaterra, 08193, Barcelona, Spain
| | - Daniel Maspoch
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC & The Barcelona Institute of Science and Technology, Bellaterra, 08193, Barcelona, Spain.,ICREA, Pg. Lluis Companys 23, 08010, Barcelona, Spain
| | - Nicolas Vogel
- Institute of Particle Technology, Friedrich-Alexander Universität Erlangen-Nürnberg, 91058, Erlangen, Germany
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Wang J, Liu Y, Bleyer G, Goerlitzer ESA, Englisch S, Przybilla T, Mbah CF, Engel M, Spiecker E, Imaz I, Maspoch D, Vogel N. Coloration in Supraparticles Assembled from Polyhedral Metal‐Organic Framework Particles. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202117455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Junwei Wang
- Institute of Particle Technology Friedrich-Alexander Universität Erlangen-Nürnberg 91058 Erlangen Germany
| | - Yang Liu
- Catalan Institute of Nanoscience and Nanotechnology (ICN2) CSIC & The Barcelona Institute of Science and Technology Bellaterra 08193 Barcelona Spain
| | - Gudrun Bleyer
- Institute of Particle Technology Friedrich-Alexander Universität Erlangen-Nürnberg 91058 Erlangen Germany
| | - Eric S. A. Goerlitzer
- Institute of Particle Technology Friedrich-Alexander Universität Erlangen-Nürnberg 91058 Erlangen Germany
| | - Silvan Englisch
- Institute of Micro- and Nanostructure Research (IMN) Center for Nanoanalysis and Electron Microscopy (CENEM) IZNF, Friedrich-Alexander Universität Erlangen-Nürnberg 91058 Erlangen Germany
| | - Thomas Przybilla
- Institute of Micro- and Nanostructure Research (IMN) Center for Nanoanalysis and Electron Microscopy (CENEM) IZNF, Friedrich-Alexander Universität Erlangen-Nürnberg 91058 Erlangen Germany
| | - Chrameh Fru Mbah
- Institute for Multiscale Simulation IZNF, Friedrich-Alexander Universität Erlangen-Nürnberg 91058 Erlangen Germany
| | - Michael Engel
- Institute for Multiscale Simulation IZNF, Friedrich-Alexander Universität Erlangen-Nürnberg 91058 Erlangen Germany
| | - Erdmann Spiecker
- Institute of Micro- and Nanostructure Research (IMN) Center for Nanoanalysis and Electron Microscopy (CENEM) IZNF, Friedrich-Alexander Universität Erlangen-Nürnberg 91058 Erlangen Germany
| | - Inhar Imaz
- Catalan Institute of Nanoscience and Nanotechnology (ICN2) CSIC & The Barcelona Institute of Science and Technology Bellaterra 08193 Barcelona Spain
| | - Daniel Maspoch
- Catalan Institute of Nanoscience and Nanotechnology (ICN2) CSIC & The Barcelona Institute of Science and Technology Bellaterra 08193 Barcelona Spain
- ICREA Pg. Lluis Companys 23 08010 Barcelona Spain
| | - Nicolas Vogel
- Institute of Particle Technology Friedrich-Alexander Universität Erlangen-Nürnberg 91058 Erlangen Germany
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15
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Kim JH, Kim JB, Choi YH, Park S, Kim SH. Photonic Microbeads Templated by Oil-in-Oil Emulsion Droplets for High Saturation of Structural Colors. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2105225. [PMID: 34889511 DOI: 10.1002/smll.202105225] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Revised: 11/17/2021] [Indexed: 06/13/2023]
Abstract
Photonic microbeads containing crystalline colloidal arrays are promising as a key component of structural-color inks for various applications including printings, paintings, and cosmetics. However, structural colors from microbeads usually have low color saturation and the production of the beads requires delicate and time-consuming protocols. Herein, elastic photonic microbeads are designed with enhanced color saturation through facile photocuring of oil-in-oil emulsion droplets. Dispersions of highly-concentrated silica particles in elastomer precursors are microfluidically emulsified into immiscible oil to produce monodisperse droplets. The silica particles spontaneously form crystalline arrays in the entire volume of the droplets due to interparticle repulsion which is unperturbed by the diffusion of the surrounding oil whereas weakened for oil-in-water droplets. The crystalline arrays are permanently stabilized by photopolymerization of the precursor, forming elastic photonic microbeads. The microbeads are transferred into the refractive-index-matched biocompatible oil. The high crystallinity of colloidal arrays increases the reflectivity at stopband and the index matching reduces incoherent scattering at the surface of the microbeads, enhancing color saturation. The colors can be adjusted by mixing two distinctly colored microbeads. Also, low stiffness and high elasticity reduce foreign-body sensation and enhance fluidity, potentially serving as pragmatic structural colorants for photonic inks.
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Affiliation(s)
- Jong Hyun Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Jong Bin Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Ye Hun Choi
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Sanghyuk Park
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Shin-Hyun Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
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16
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Kuhn E, Röhlig D, Sowade E, Rittrich D, Willert A, Schulz SE, Baumann RR, Thränhardt A, Blaudeck T. Disorder explains dual‐band reflection spectrum in spherical colloidal photonic supraparticle assemblies. NANO SELECT 2021. [DOI: 10.1002/nano.202100263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Affiliation(s)
- Eduard Kuhn
- Theoretical Physics Simulation of New Materials Technische Universität Chemnitz 09107 Chemnitz Germany
| | - David Röhlig
- Theoretical Physics Simulation of New Materials Technische Universität Chemnitz 09107 Chemnitz Germany
| | - Enrico Sowade
- Digital Printing and Imaging Technology Technische Universität Chemnitz 09107 Chemnitz Germany
| | - Dirk Rittrich
- Center for Microtechnologies (ZfM) Technische Universität Chemnitz 09107 Chemnitz Germany
| | - Andreas Willert
- Printed Functionalities Fraunhofer Institute for Electronic Nano Systems (ENAS) 09126 Chemnitz Germany
| | - Stefan E. Schulz
- Center for Microtechnologies (ZfM) Technische Universität Chemnitz 09107 Chemnitz Germany
- Nano Device Technologies Fraunhofer Institute for Electronic Nano Systems (ENAS) 09126 Chemnitz Germany
- Research Center for Materials, Architectures and Integration of Nanomembranes (MAIN) Technische Universität Chemnitz 09107 Chemnitz Germany
| | - Reinhard R. Baumann
- Digital Printing and Imaging Technology Technische Universität Chemnitz 09107 Chemnitz Germany
- Printed Functionalities Fraunhofer Institute for Electronic Nano Systems (ENAS) 09126 Chemnitz Germany
| | - Angela Thränhardt
- Theoretical Physics Simulation of New Materials Technische Universität Chemnitz 09107 Chemnitz Germany
| | - Thomas Blaudeck
- Center for Microtechnologies (ZfM) Technische Universität Chemnitz 09107 Chemnitz Germany
- Nano Device Technologies Fraunhofer Institute for Electronic Nano Systems (ENAS) 09126 Chemnitz Germany
- Research Center for Materials, Architectures and Integration of Nanomembranes (MAIN) Technische Universität Chemnitz 09107 Chemnitz Germany
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17
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Wang J, Kang E, Sultan U, Merle B, Inayat A, Graczykowski B, Fytas G, Vogel N. Influence of Surfactant-Mediated Interparticle Contacts on the Mechanical Stability of Supraparticles. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:23445-23456. [PMID: 34737841 PMCID: PMC8558861 DOI: 10.1021/acs.jpcc.1c06839] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 09/15/2021] [Indexed: 05/14/2023]
Abstract
Colloidal supraparticles are micron-scale spherical assemblies of uniform primary particles, which exhibit emergent properties of a colloidal crystal, yet exist as a dispersible powder. A prerequisite to utilize these emergent functionalities is that the supraparticles maintain their mechanical integrity upon the mechanical impacts that are likely to occur during processing. Understanding how the internal structure relates to the resultant mechanical properties of a supraparticle is therefore of general interest. Here, we take the example of supraparticles templated from water/fluorinated oil emulsions in droplet-based microfluidics and explore the effect of surfactants on their mechanical properties. Stable emulsions can be generated by nonionic block copolymers consisting of a hydrophilic and fluorophilic block and anionic fluorosurfactants widely available under the brand name Krytox. The supraparticles formed in the presence of both types of surfactants appear structurally similar, but differ greatly in their mechanical properties. While the nonionic surfactant induces superior mechanical stability and ductile fracture behavior, the anionic Krytox surfactant leads to weak supraparticles with brittle fracture. We complement this macroscopic picture with Brillouin light spectroscopy that is very sensitive to the interparticle contacts for subnanometer-thick adsorbed layers atop of the nanoparticle. While the anionic Krytox does not significantly affect the interparticle bonds, the amphiphilic nonionic surfactant drastically strengthens these bonds to the point that individual particle vibrations are not resolved in the experimental spectrum. Our results demonstrate that seemingly subtle changes in the physicochemical properties of supraparticles can drastically impact the resultant mechanical properties.
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Affiliation(s)
- Junwei Wang
- Institute
of Particle Technology, Friedrich-Alexander
University Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany
| | - Eunsoo Kang
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Umair Sultan
- Institute
of Particle Technology, Friedrich-Alexander
University Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany
- Institute
of Chemical Reaction Engineering, Friedrich-Alexander
University Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Benoit Merle
- Materials
Science and Engineering I and Interdisciplinary Center for Nanostructured
Films (IZNF), Friedrich-Alexander University
Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Alexandra Inayat
- Institute
of Chemical Reaction Engineering, Friedrich-Alexander
University Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Bartlomiej Graczykowski
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Faculty
of Physics, Adam Mickiewicz University, Uniwersytetu Poznanskiego 2, Poznan 61-614, Poland
| | - George Fytas
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- E-mail:
| | - Nicolas Vogel
- Institute
of Particle Technology, Friedrich-Alexander
University Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany
- E-mail:
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18
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Kim YG, Park S, Choi YH, Han SH, Kim SH. Elastic Photonic Microcapsules Containing Colloidal Crystallites as Building Blocks for Macroscopic Photonic Surfaces. ACS NANO 2021; 15:12438-12448. [PMID: 33988026 DOI: 10.1021/acsnano.1c02000] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Colloidal crystals develop structural colors through wavelength-selective diffraction. Recently, a granular format of colloidal crystals has emerged as building blocks to construct macroscopic photonic surfaces or architectures with high reconfigurability through the secondary assembly. Here, we design elastic photonic microcapsules containing colloidal crystallites along the inner wall as a building block. Water-in-oil-in-water double-emulsion templates are microfluidically prepared to have an aqueous dispersion of polystyrene particles in the inner droplet and polydimethylsiloxane prepolymers in the shell. Colloidal particles are enriched in the presence of depletant and salt by osmotic compression, with the crystallization at the inner interface by depletion attraction. The number of nucleation sites depends on the rate of the enrichment, which enables control over the size and surface coverage of the crystallites with osmotic conditions. The enrichment is ceased by transferring the droplets into an isotonic solution, and the oil shell is cured to form an elastic membrane. As the elastic microcapsules have a large void in the core, they are deformable without structural damage in the crystallites. Therefore, the microcapsules can be closely packed to form macroscopic surfaces while achieving a high quality of structural colors with a collection of crystallites aligned along the flattened membrane.
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Affiliation(s)
- Young Geon Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Sanghyuk Park
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Ye Hun Choi
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Sang Hoon Han
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Shin-Hyun Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
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