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Liu T, Solomon MJ. Reconfigurable Grating Diffraction Structural Color in Self-Assembled Colloidal Crystals. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2301871. [PMID: 37144433 DOI: 10.1002/smll.202301871] [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: 03/08/2023] [Revised: 04/14/2023] [Indexed: 05/06/2023]
Abstract
Self-assembled colloidal crystals display structural colors due to light diffracted from their microscale, ordered structure. This color arises due to Bragg reflection (BR) or grating diffraction (GD); the latter mechanism is much less explored than the former. Here the design space for generating GD structural color is identified and its relative advantages are demonstrated. Electrophoretic deposition is used to self-assemble crystals with fine crystal grains from colloids of diameter 1.0 µm. The structural color in transmission is tunable across the full visible spectrum. The optimum optical response-represented by both color intensity and saturation-is observed at low layer number (≤5 layers). The spectral response is well predicted by Mie scattering of the crystals. Taken together, the experimental and theoretical results demonstrate that vivid grating colors with high color saturation can be produced from thin layers of micron-sized colloids. These colloidal crystals extend the potential of artificial structural color materials.
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Affiliation(s)
- Tianyu Liu
- Department of Chemical Engineering and Biointerfaces Institute, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Michael J Solomon
- Department of Chemical Engineering and Biointerfaces Institute, University of Michigan, Ann Arbor, MI, 48109, USA
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2
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Lomeli-Martin A, Ahamed N, Abhyankar VV, Lapizco-Encinas BH. Electropatterning-Contemporary developments for selective particle arrangements employing electrokinetics. Electrophoresis 2023; 44:884-909. [PMID: 37002779 PMCID: PMC10330388 DOI: 10.1002/elps.202200286] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 02/25/2023] [Accepted: 03/27/2023] [Indexed: 04/04/2023]
Abstract
The selective positioning and arrangement of distinct types of multiscale particles can be used in numerous applications in microfluidics, including integrated circuits, sensors and biochips. Electrokinetic (EK) techniques offer an extensive range of options for label-free manipulation and patterning of colloidal particles by exploiting the intrinsic electrical properties of the target of interest. EK-based techniques have been widely implemented in many recent studies, and various methodologies and microfluidic device designs have been developed to achieve patterning two- and three-dimensional (3D) patterned structures. This review provides an overview of the progress in electropatterning research during the last 5 years in the microfluidics arena. This article discusses the advances in the electropatterning of colloids, droplets, synthetic particles, cells, and gels. Each subsection analyzes the manipulation of the particles of interest via EK techniques such as electrophoresis and dielectrophoresis. The conclusions summarize recent advances and provide an outlook on the future of electropatterning in various fields of application, especially those with 3D arrangements as their end goal.
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Affiliation(s)
- Adrian Lomeli-Martin
- Microscale Bioseparations Laboratory and Biomedical Engineering Department, Rochester Institute of Technology, Rochester, New York, USA
| | - Nuzhet Ahamed
- Microscale Bioseparations Laboratory and Biomedical Engineering Department, Rochester Institute of Technology, Rochester, New York, USA
| | - Vinay V. Abhyankar
- Biological Microsystems Laboratory and Biomedical Engineering Department, Rochester Institute of Technology, Rochester, New York, USA
| | - Blanca H. Lapizco-Encinas
- Microscale Bioseparations Laboratory and Biomedical Engineering Department, Rochester Institute of Technology, Rochester, New York, USA
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3
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Chai Z, Childress A, Busnaina AA. Directed Assembly of Nanomaterials for Making Nanoscale Devices and Structures: Mechanisms and Applications. ACS NANO 2022; 16:17641-17686. [PMID: 36269234 PMCID: PMC9706815 DOI: 10.1021/acsnano.2c07910] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 10/06/2022] [Indexed: 05/19/2023]
Abstract
Nanofabrication has been utilized to manufacture one-, two-, and three-dimensional functional nanostructures for applications such as electronics, sensors, and photonic devices. Although conventional silicon-based nanofabrication (top-down approach) has developed into a technique with extremely high precision and integration density, nanofabrication based on directed assembly (bottom-up approach) is attracting more interest recently owing to its low cost and the advantages of additive manufacturing. Directed assembly is a process that utilizes external fields to directly interact with nanoelements (nanoparticles, 2D nanomaterials, nanotubes, nanowires, etc.) and drive the nanoelements to site-selectively assemble in patterned areas on substrates to form functional structures. Directed assembly processes can be divided into four different categories depending on the external fields: electric field-directed assembly, fluidic flow-directed assembly, magnetic field-directed assembly, and optical field-directed assembly. In this review, we summarize recent progress utilizing these four processes and address how these directed assembly processes harness the external fields, the underlying mechanism of how the external fields interact with the nanoelements, and the advantages and drawbacks of utilizing each method. Finally, we discuss applications made using directed assembly and provide a perspective on the future developments and challenges.
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Affiliation(s)
- Zhimin Chai
- State
Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing100084, China
- NSF
Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing
(CHN), Northeastern University, Boston, Massachusetts02115, United States
| | - Anthony Childress
- NSF
Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing
(CHN), Northeastern University, Boston, Massachusetts02115, United States
| | - Ahmed A. Busnaina
- NSF
Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing
(CHN), Northeastern University, Boston, Massachusetts02115, United States
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Abd El-Mageed AI, Essawy HA, Dyab AK. Dipolar particles via photopolymerization of 1,6-hexanediol diacrylate miniemulsion template tailored with oppositely-charged polymerizable surfactants. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.131197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Kim MJ, Huang ZM, Kim YK, Jang J, Youn JR, Song YS. Optorheological Characteristics of Photosynthetic Bacterium Suspension. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:10979-10986. [PMID: 34491749 DOI: 10.1021/acs.langmuir.1c01527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Understanding the rheological behavior of materials is of great importance in science. Here, we report a microscopic foundation for optorheology by manipulating the rheological feature through light. A new phenomenon is observed in the photosynthetic bacterial suspension, that the fluid viscosity changes by light-induced electrons. Type IV pili of photosynthetic bacteria is found, and it allows the electron to transport through the exterior of cells and changes the surface potential of cells, which causes an adjustment in the spatial arrangement of cells in the suspension. When an external electric field is applied, the electric dipole of the cells is induced and their dispersion is changed. The rheological properties are measured to evaluate the internal structure of the suspension depending on the light. The photoelectrons enhance the dispersion of the photosynthetic bacteria in the solution, thus leading to a significant increment in the viscosity. We envision that this discovery will provide new applications to the interface of optics, bioengineering, and rheology.
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Affiliation(s)
- Min Jung Kim
- Research Institute of Advanced Materials (RIAM), Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Zheng Min Huang
- Department of Fiber Convergence Materials Engineering, Dankook University, Gyeonggi-do 16890, Korea
| | - Yun Ki Kim
- School of Chemical and Biological Engineering, College of Engineering, Seoul National University, Seoul 08826, Korea
| | - Jyongsik Jang
- School of Chemical and Biological Engineering, College of Engineering, Seoul National University, Seoul 08826, Korea
| | - Jae Ryoun Youn
- Research Institute of Advanced Materials (RIAM), Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Young Seok Song
- Department of Fiber Convergence Materials Engineering, Dankook University, Gyeonggi-do 16890, Korea
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Rath M, Weaver J, Wang M, Woehl T. pH-Mediated Aggregation-to-Separation Transition for Colloids Near Electrodes in Oscillatory Electric Fields. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:9346-9355. [PMID: 34324358 DOI: 10.1021/acs.langmuir.1c00671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Colloids in low-frequency (<1 kHz) oscillatory electric fields near planar electrodes aggregate in neutral pH electrolytes due to electrohydrodynamic (EHD) flow but separate in alkaline pH electrolytes. Colloid ζ-potential and electrolyte ion mobilities are thought to play roles in the underlying mechanism for this phenomenon, but a unifying theory for why particles aggregate in some electrolytes and separate in others remains to be established. Here, we show that increasing local pH near the electrode with an electrochemical reaction causes a colloidal aggregation-to-separation transition in oscillatory electric fields that induce strong attractive EHD flows. An electroactive molecule, para-benzoquinone, was electrochemically reduced at the electrode to locally increase the solution pH near the colloids. Superimposing a sufficiently large steady electrochemical potential onto an oscillatory potential caused a reversible aggregation-to-separation transition. Counterintuitively, decreasing frequency, which increases attractive EHD drag forces, caused a similar aggregation-to-separation transition. Even more interesting, multiple transitions were observed while varying the oscillatory potential. Taken together, these results suggested that the oscillatory potential induced a repulsive hydrodynamic drag force. Scaling arguments for the recently discovered asymmetric rectified electric field (AREF) showed that a repulsive AREF-induced electroosmotic (EO) flow competed with attractive EHD flow. A pairwise colloidal force balance including these competing flows exhibited flow inversions qualitatively consistent with experimentally observed aggregation-to-separation transitions. Broadly, these results emphasize the importance of AREF-induced EO flows in colloid aggregation and separation in low-frequency oscillatory electric fields.
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Affiliation(s)
- Medha Rath
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 21044, United States
| | - Jacqueline Weaver
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 21044, United States
| | - Mei Wang
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 21044, United States
| | - Taylor Woehl
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 21044, United States
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Kao PK, VanSaders BJ, Glotzer SC, Solomon MJ. Accelerated annealing of colloidal crystal monolayers by means of cyclically applied electric fields. Sci Rep 2021; 11:11042. [PMID: 34040047 PMCID: PMC8155009 DOI: 10.1038/s41598-021-90310-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 05/06/2021] [Indexed: 11/09/2022] Open
Abstract
External fields are commonly applied to accelerate colloidal crystallization; however, accelerated self-assembly kinetics can negatively impact the quality of crystal structures. We show that cyclically applied electric fields can produce high quality colloidal crystals by annealing local disorder. We find that the optimal off-duration for maximum annealing is approximately one-half of the characteristic melting half lifetime of the crystalline phase. Local six-fold bond orientational order grows more rapidly than global scattering peaks, indicating that local restructuring leads global annealing. Molecular dynamics simulations of cyclically activated systems show that the ratio of optimal off-duration for maximum annealing and crystal melting time is insensitive to particle interaction details. This research provides a quantitative relationship describing how the cyclic application of fields produces high quality colloidal crystals by cycling at the fundamental time scale for local defect rearrangements; such understanding of dynamics and kinetics can be applied for reconfigurable colloidal assembly.
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Affiliation(s)
- Peng-Kai Kao
- Department of Chemical Engineering, University of Michigan, North Campus Research Complex, Building 10 - A151, 2800 Plymouth Road, Ann Arbor, MI, 48109, USA
| | - Bryan J VanSaders
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, USA
| | - Sharon C Glotzer
- Department of Chemical Engineering, University of Michigan, North Campus Research Complex, Building 10 - A151, 2800 Plymouth Road, Ann Arbor, MI, 48109, USA
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, USA
| | - Michael J Solomon
- Department of Chemical Engineering, University of Michigan, North Campus Research Complex, Building 10 - A151, 2800 Plymouth Road, Ann Arbor, MI, 48109, USA.
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Gao H, Xu Y, Yao K, Liu Y. Self-Assembly of Silica-Gold Core-Shell Microparticles by Electric Fields Toward Dynamically Tunable Metamaterials. ACS APPLIED MATERIALS & INTERFACES 2021; 13:14417-14422. [PMID: 33728895 DOI: 10.1021/acsami.1c02724] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Metamaterials, rationally engineered composite materials with exotic properties, have provided unprecedented opportunities to manipulate the propagation of electromagnetic waves and control light-matter interactions in a prescribed manner. At present, most metamaterials are in solid states, and their functions are fixed once fabricated. Applying external electric fields to assemble metallic and metallodielectric particles into distinct configurations is an approach to realize dynamically tunable or reconfigurable metamaterials. In this paper, we show that core-shell microparticles can be self-assembled into chain structures under an alternating current (AC) electric field at different oscillation frequencies. We have conducted optical characterizations of silica-gold core-shell particles by Fourier transform infrared (FTIR) spectroscopy, which show distinct optical responses at mid-infrared wavelengths before and after the chain formation. Full-wave simulations unveil that the spectral features arise from the coupling between the sophisticated plasmonic resonant modes of individual core-shell particles. The reconfigurable metamaterials based on the manipulation and assembly of metallic and metallodielectric particles have potential applications in optofluidic devices, liquid-borne microcircuits, and optical sensing.
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Affiliation(s)
- Han Gao
- Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115, United States
| | - Yihao Xu
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, Massachusetts 02115, United States
| | - Kan Yao
- Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115, United States
| | - Yongmin Liu
- Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115, United States
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, Massachusetts 02115, United States
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Field-Induced Assembly of sp-sp 2 Carbon Sponges. NANOMATERIALS 2021; 11:nano11030763. [PMID: 33803066 PMCID: PMC8002869 DOI: 10.3390/nano11030763] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 03/12/2021] [Accepted: 03/13/2021] [Indexed: 11/16/2022]
Abstract
The formation of macroscale carbon structures characterised by an sp-sp2-hybridization is realised by self-assembly in colloidal solutions under an effect of laser irradiation and electromagnetic fields. The sponge-like morphology, sculptured with gold nanoparticles (NPs) was revealed by Scanning Electron Microscopy (SEM) imaging. Full structural and defect characterization of the self-assembled sponges was provided using the micro-Raman spectroscopic technique. The synthesized clusters manifest themselves in the presence of a strong spectral band in the visible range of the photoluminescence spectra that is quite unusual for ordered sp2-carbon systems.
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10
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Yan J, Rashidi A, Wirth CL. Single and ensemble response of colloidal ellipsoids to a nearby ac electrode. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125384] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Zhang Y, Jiang W, Gu T, Han J, Lei B, Wang L, Liu H, Yin L, Chen B, Shi Y. Multidomain Oriented Particle Chains Based on Spatial Electric Field and Their Optical Application. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11546-11555. [PMID: 32933255 DOI: 10.1021/acs.langmuir.0c02021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The manipulation technology of particles is significant in drug screening, disease detection and treatment, etc. Here, we reported the multidomain oriented particle chains based on a spatial electric field and their optical application. According to the differences in the dielectric behavior of particles, the preparation of multidomain oriented particle chains in the gel was successfully realized by using the dielectrophoretic force and electroosmotic rotation. This provides a new idea for manufacturing multistructure, multilayer, and multifunctional intelligent response materials. In addition, the factors affecting the alignment height of the particles in the gel were discussed, which was the basis for the preparation of bilayer particle chains. As an example of structural hierarchy, particle assembly has broad application prospects in optoelectronic devices and soft robots.
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Affiliation(s)
- Yajun Zhang
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710054, China
| | - Weitao Jiang
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710054, China
| | - Tongkai Gu
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710054, China
| | - Jie Han
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710054, China
| | - Biao Lei
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710054, China
| | - Lanlan Wang
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710054, China
| | - Hongzhong Liu
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710054, China
| | - Lei Yin
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710054, China
| | - Bangdao Chen
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710054, China
| | - Yongsheng Shi
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710054, China
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Park JE, Oh N, Nam H, Park JH, Kim S, Jeon JS, Yang M. Efficient Capture and Raman Analysis of Circulating Tumor Cells by Nano-Undulated AgNPs-rGO Composite SERS Substrates. SENSORS (BASEL, SWITZERLAND) 2020; 20:E5089. [PMID: 32906807 PMCID: PMC7570931 DOI: 10.3390/s20185089] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 09/02/2020] [Accepted: 09/05/2020] [Indexed: 12/12/2022]
Abstract
The analysis of circulating tumor cells (CTCs) in the peripheral blood of cancer patients is critical in clinical research for further investigation of tumor progression and metastasis. In this study, we present a novel surface-enhanced Raman scattering (SERS) substrate for the efficient capture and characterization of cancer cells using silver nanoparticles-reduced graphene oxide (AgNPs-rGO) composites. A pulsed laser reduction of silver nanowire-graphene oxide (AgNW-GO) mixture films induces hot-spot formations among AgNPs and artificial biointerfaces consisting of rGOs. We also use in situ electric field-assisted fabrication methods to enhance the roughness of the SERS substrate. The AgNW-GO mixture films, well suited for the proposed process due to its inherent electrophoretic motion, is adjusted between indium tin oxide (ITO) transparent electrodes and the nano-undulated surface is generated by applying direct-current (DC) electric fields during the laser process. As a result, MCF7 breast cancer cells are efficiently captured on the AgNPs-rGO substrates, about four times higher than the AgNWs-GO films, and the captured living cells are successfully analyzed by SERS spectroscopy. Our newly designed bifunctional substrate can be applied as an effective system for the capture and characterization of CTCs.
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Affiliation(s)
- Jong-Eun Park
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea; (J.-E.P.); (H.N.); (S.K.)
| | - Nuri Oh
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea; (N.O.); (J.-H.P.)
- Center for Systems Biology, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Hyeono Nam
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea; (J.-E.P.); (H.N.); (S.K.)
| | - Ji-Ho Park
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea; (N.O.); (J.-H.P.)
| | - Sanha Kim
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea; (J.-E.P.); (H.N.); (S.K.)
| | - Jessie S. Jeon
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea; (J.-E.P.); (H.N.); (S.K.)
| | - Minyang Yang
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea; (J.-E.P.); (H.N.); (S.K.)
- Department of Mechanical Engineering, State University of New York Korea, Incheon 21985, Korea
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13
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Genix AC, Oberdisse J. Nanoparticle self-assembly: from interactions in suspension to polymer nanocomposites. SOFT MATTER 2018; 14:5161-5179. [PMID: 29893402 DOI: 10.1039/c8sm00430g] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Recent experimental results using in particular small-angle scattering to characterize the self-assembly of mainly hard spherical nanoparticles into higher ordered structures ranging from fractal aggregates to ordered assemblies are reviewed. The crucial control of interparticle interactions is discussed, from chemical surface-modification, or the action of additives like depletion agents, to the generation of directional patches and the use of external fields. It is shown how the properties of interparticle interactions have been used to allow inducing and possibly controlling aggregation, opening the road to the generation of colloidal molecules or potentially metamaterials. In the last part, studies of the microstructure of polymer nanocomposites as an application of volume-spanning and stress-carrying aggregates are discussed.
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Affiliation(s)
- Anne-Caroline Genix
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, F-34095 Montpellier, France.
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15
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Khrapak SA, Kryuchkov NP, Yurchenko SO. Thermodynamics and dynamics of two-dimensional systems with dipolelike repulsive interactions. Phys Rev E 2018; 97:022616. [PMID: 29548185 DOI: 10.1103/physreve.97.022616] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Indexed: 06/08/2023]
Abstract
Thermodynamics and dynamics of a classical two-dimensional system with dipolelike isotropic repulsive interactions are studied systematically using extensive molecular dynamics (MD) simulations supplemented by appropriate theoretical approximations. This interaction potential, which decays as an inverse cube of the interparticle distance, belongs to the class of very soft long-ranged interactions. As a result, the investigated system exhibits certain universal properties that are also shared by other related soft-interacting particle systems (like, for instance, the one-component plasma and weakly screened Coulomb systems). These universalities are explored in this article to construct a simple and reliable description of the system thermodynamics. In particular, Helmholtz free energies of the fluid and solid phases are derived, from which the location of the fluid-solid coexistence is determined. The quasicrystalline approximation is applied to the description of collective modes in dipole fluids. Its simplification, previously validated on strongly coupled plasma fluids, is used to derive explicit analytic dispersion relations for the longitudinal and transverse wave modes, which compare satisfactory with those obtained from direct MD simulations in the long-wavelength regime. Sound velocities of the dipole fluids and solids are derived and analyzed.
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Affiliation(s)
- Sergey A Khrapak
- Aix Marseille University, CNRS, PIIM, 13397 Marseille, France
- Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 82234 Weßling, Germany
- Joint Institute for High Temperatures, Russian Academy of Sciences, 125412 Moscow, Russia
| | - Nikita P Kryuchkov
- Bauman Moscow State Technical University, 2nd Baumanskaya street 5, 105005 Moscow, Russia
| | - Stanislav O Yurchenko
- Bauman Moscow State Technical University, 2nd Baumanskaya street 5, 105005 Moscow, Russia
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