Article
Chemistry, Physical
Rachel S. Hendley, Isaac Torres-Diaz, Michael A. Bevan
Summary: By identifying analytical potentials for dipole-field and dipole-dipole interactions, we match experimental and simulated configurations of anisotropic epoxy colloidal particles in high frequency AC electric fields. The inverse Monte Carlo simulation algorithm helps determine optimal fits of analytical potentials to capture experimental observations. The stretched point dipole potential is found suitable at all concentrations, field amplitudes, and degrees of ordering, showing simplicity, accuracy, and adjustability for modeling field mediated microstructures and assembly of systematically varying anisotropic particle shapes.
Article
Chemistry, Multidisciplinary
Xiaowen Chen, Xi Chen, Yixin Peng, Lailai Zhu, Wei Wang
Summary: Controlled colloidal levitation has various applications, and recent studies have shown that polymer microspheres can be levitated in AC electric fields. This phenomenon has been attributed to electrohydrodynamic flows, asymmetric electric fields, and electrodiffusiophoresis. In this study, we propose an alternative mechanism based on dielectrophoresis, where a spatially inhomogeneous electric field gradient is created by electrode polarization. Numerical models support this mechanism and demonstrate that AC colloidal levitation can be utilized to control the movement of synthetic microswimmers. This research enhances our understanding of colloidal particle dynamics near electrodes and opens up possibilities for using AC levitation to manipulate colloidal particles.
Article
Chemistry, Physical
Zhan-Wei Li, Yu-Wei Sun, Yan-Hui Wang, You-Liang Zhu, Zhong-Yuan Lu, Zhao-Yan Sun
Summary: Using simple deformable triblock Janus colloids, increasing particle softness enhances the self-assembly and photonic bandgap performance of the structures. Direct pyrochlore lattices formed from overlapping soft particles exhibit larger photonic bandgaps than nonoverlapping structures, and proper overlap caused by softness can significantly improve the photonic properties of the structures.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Biomaterials
Yadu Nath Vakkipurath Kodakkadan, Charlie Maslen, Petr Cigler, Frantisek Stepanek, Ivan Rehor
Summary: This method involves using different types of microgel platelets to self-assemble into ordered 2D structures with material anisotropy on an inclined plane. Through gravitational pull, the microgel platelets self-orient and form densely packed structures at the bottom of the tilted plane.
JOURNAL OF MATERIALS CHEMISTRY B
(2021)
Review
Chemistry, Multidisciplinary
Xueguang Chen, Linhan Lin, Zhengcao Li, Hong-Bo Sun
Summary: The assembly of colloidal particles into superstructures is significant for understanding collective behavior and designing novel colloidal materials. Light plays a crucial role in the directed assembly process, and the understanding of light-matter interaction is critical for tailoring assembly kinetics. Colloidal atoms exhibit diversity in size, shape, and composition, enriching the geometric complexity of colloidal matter. The emerging applications of colloidal superstructures in nanophotonics, nanocatalysis, and nanomedicine are discussed.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Biochemical Research Methods
Sangwoo Shin
Summary: DC electrokinetics enables the manipulation and assembly of colloidal particles, contributing to the understanding of life origin and the synthesis of new materials for various applications.
Article
Chemistry, Physical
Kun Wang, Samuel Leville, Behrouz Behdani, Carlos A. Silvera Batista
Summary: This study demonstrates the advantageous use of Faradaic processes under AC fields for long-range transport, focusing and assembly of charged colloids. By adjusting the voltage and frequency, the position and order of the levitating crystalline sheet can be easily controlled.
Article
Chemistry, Multidisciplinary
Zhengting Zhang, Guiyun Yi, Xiaodong Wang, Peng Li, Zhuoyan Wan, Yulong Zhang
Summary: A novel self-assembly technique called suspending self-assembly method (SSAM) was proposed for fabricating three-dimensional colloidal crystals. By manipulating electrostatic intersphere repulsive forces, a variety of polystyrene (PS) colloidal crystals with different diameters can be prepared. The major driving force for successful ordering process is found to be electrostatic repulsive forces between PS microspheres, rather than capillary forces. This work has the potential to revolutionize the current preparation techniques of colloidal crystals.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Chemistry, Physical
Umesh Dhumal, Umashankar Erigi, Mukta Tripathy
Summary: This study investigates the structure and phase behavior of polymer-Janus nanorod mixtures using PRISM theory and molecular dynamics simulations. The results show that the system undergoes transitions from depletion-driven contact aggregation to dispersion and then to bridging-driven phase separation. At high Janus nanorod densities, the system exhibits a transition from depletion-driven macrophase separation to dispersion, and then to chemical anisotropy-driven self-assembly.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Denise Chirinos-Flores, Rodrigo Sanchez, Pedro Diaz-Leyva, Anna Kozina
Summary: The study investigates the structure and dynamics of asymmetrically decorated silica-based Janus particles in a hydrophobic solvent, observing gelation of amphiphilic Janus particles with asymmetric surface decoration in the hydrophobic medium. The influence of particle asymmetry on gel structure and dynamics is discussed, revealing compact structures with contributions of asymmetric short-range attractions and cross-term repulsions to the net effective interaction potential.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Cicely Shillingford, Brandon M. Kim, Marcus Weck
Summary: Capillary assembly of liquid particles (CALP) is a microfabrication strategy for engineering arbitrarily shaped polymer colloids. CALP demonstrates versatility by engineering geometrically diverse Janus and patchy colloids using consecutive assembly and heterogeneous coassembly. It enables the design and fabrication of colloids with complex internal construction to target hierarchical functional materials, with the potential for further processing into colloid-based microscale devices.
Article
Nanoscience & Nanotechnology
Han Gao, Yihao Xu, Kan Yao, Yongmin Liu
Summary: This study demonstrates that core-shell microparticles can self-assemble into chain structures under an alternating current electric field at different frequencies, showing distinct optical responses before and after chain formation. By manipulating and assembling metallic and metallodielectric particles, reconfigurable metamaterials with potential applications in optofluidic devices, liquid-borne microcircuits, and optical sensing can be realized.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Alex McGlasson, Eva Morgenthaler, Laura C. Bradley, Thomas P. Russell
Summary: This study investigates the interfacial kinetics and assembly mechanism of anisotropic amphiphilic Janus particles using dynamic pendant drop tensiometry. The results shed light on the assembly mechanism of more complex Janus particle morphologies and highlight their effectiveness as interface stabilizers.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yingchun Long, Qiuhua Wu, Xiuyuan Zuo, Guolin Zhang, Zexin Zhang, Zhenzhong Yang, Fuxin Liang
Summary: Nanoparticles with anisotropic morphology and composition were successfully synthesized via a sol-gel process. The neck length of the particles could be controlled by different precursors, and colloidal motors with explicit directionality and tunable speeds were achieved by selectively loading Pt catalyst.
Article
Chemistry, Physical
Susana Marin-Aguilar, Fabrizio Camerin, Marjolein Dijkstra
Summary: The assembly of colloidal cubic diamond is a challenging process. This study explores the conditions for the nucleation of cubic diamond, focusing on the effect of depletion and DNA-mediated interactions. The study finds that a specific balance between the strength and range of depletion interactions enhances the self-assembly of stable cubic diamond.
JOURNAL OF CHEMICAL PHYSICS
(2022)