Article
Chemistry, Physical
Madhumita Choudhuri, Meneka Banik, Rabibrata Mukherjee
Summary: This article presents a facile template guided approach for fabricating ordered non-close packed (NCP) arrays of colloidal particles. Soft lithography is used to replicate hexagonal close packed (HCP) arrays, obtaining topographically patterned positive and/or negative replicas. These replicas are then used as templates to spin coat smaller colloidal particles, resulting in ordered NCP arrays. The NCP arrays can be transferred onto any flat surface by UVO mediated colloidal transfer printing.
Article
Chemistry, Multidisciplinary
Javier Fonseca, Lingxin Meng, Pedro Moronta, Inhar Imaz, Cefe Lopez, Daniel Maspoch
Summary: Controlling the size of COF particles allows for the fabrication of porous photonic crystals (PhCs) with a face-centered cubic arrangement. By adsorbing species within the pores of COF particles, the Bragg reflection can be altered, allowing for the modulation of the structure and properties of the PhCs. Given the abundance of existing COFs and their diverse properties, this discovery is expected to enable the development of colloidal PhCs with unprecedented functionality.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
James B. Stahley, Mehdi B. Zanjani
Summary: This passage discusses the utilization of DNA-mediated assembly of colloidal particles to produce structures with desirable properties, and the study of ordered structures through self-assembly of multiple types of colloidal particles with different interaction matrices. The research involves Molecular Dynamics simulations to analyze growth behavior, predict target structures, and study phononic spectra of various ternary structures. The results provide guidelines for designing ternary and quadripartite colloidal structures, and suggest new directions for experimental work to target formation of multi-component colloidal superstructures.
Article
Chemistry, Multidisciplinary
Xin Li, Yijun Zhang, Mingxiao Li, Yang Zhao, Lingqian Zhang, Chengjun Huang
Summary: An improved protocol for preparing 2D colloidal monolayers at the air/water interface was proposed, resulting in wafer-scale monolayers with increased crystal domain size and prevention of nanosphere sinking.
Article
Chemistry, Multidisciplinary
Yafei Wang, Yan Zhang, Ying Guan, Yongjun Zhang
Summary: Compared to colloidal crystals of hard spheres, large-scale, high-quality colloidal crystals of soft microgel spheres are easier to assemble due to their tolerance to defects. In this study, magnetic poly(N-isopropylacrylamide) (PNIPAM) microgel spheres with an Fe3O4 core and a PNIPAM shell were shown to be quickly assembled into highly ordered colloidal crystals by applying an external magnetic field to diluted microgel dispersions. The magnetic assembly is simple, fast, and allows control of the crystal structure in both horizontal and vertical directions.
Article
Chemistry, Physical
M. Mayarani, Madivala G. Basavaraj, Dillip K. Satapathy
Summary: The study focuses on the self-assembly of two-dimensional nanostructures using evaporating sessile drops containing surface active colloids. It examines how evaporation kinetics under controlled humidity conditions affect the microstructure of colloidal monolayers. Experimental findings show different regions forming at the water-vapor interface under saturated humidity conditions, impacting the interface microstructure.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Renhua Deng, Jiangping Xu, Gi-Ra Yi, Jin Woong Kim, Jintao Zhu
Summary: Responsive colloidal polymer particles with well-defined shapes and ordered internal mesostructures have attracted increasing attention for their potential applications in various fields. The 3D confined assembly of block copolymers in emulsion droplets has emerged as a promising method for fabricating these particles. The engineering of anisotropically shaped and internally ordered colloidal polymer particles shows great potential in stimuli-responsiveness and emerging applications.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Mengwei Xu, Ting Lu, Dongming Qi, Ling Bai, Ying Pan, Dong Zhang, Hongting Zhao
Summary: In this study, monodisperse brown polysulfide (PSF) nanospheres and cross-linkable polyacrylate (CLPA) nanoparticles were used to construct vivid amorphous photonic crystal (APC) patterns with high mechanical stability. The high refractive index and light-absorbing characteristics of PSF nanospheres suppressed multiple incoherent light scattering inside APCs, resulting in noniridescent structural colors with high color saturation. The embedding of CLPA nanoparticles enhanced the mechanical stability of the APCs. The optimized APC samples displayed vivid colorful colors and excellent resistance towards mechanical scratches.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
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
Physics, Multidisciplinary
Dominik Lips, Ralph L. Stoop, Philipp Maass, Pietro Tierno
Summary: The study reveals a nonlinear current-density relationship in experiments of microscopic magnetic particles driven by a traveling wave potential along ordered and defective lattices. This relationship is influenced by two effects: one arising from particle sizes nearly commensurate with the substrate in combination with attractive pair interactions, leading to a superlinear increase in colloidal current at small densities; the other is interpreted to result from a defect-induced breakup of coherent cluster motion, leading to jamming at higher densities.
COMMUNICATIONS PHYSICS
(2021)
Article
Chemistry, Physical
Min Ying Tsang, Shun Tokuda, Po-Chun Han, Zaoming Wang, Alexandre Legrand, Marina Kawano, Masahiko Tsujimoto, Yuki Ikeno, Kenji Urayama, Kevin C-W Wu, Shuhei Furukawa
Summary: Assembling multiple chemical components into a material in a controlled manner is a significant challenge in chemistry. In this study, a synthetic strategy to construct porous networks with multiple chemical components is demonstrated, offering an alternative approach to developing functional porous soft materials.
Article
Chemistry, Physical
Manodeep Mondal, Rajesh Ganapathy
Summary: Extending atomic epitaxy concepts to colloidal systems has attracted scientific interest. Spatially ordered colloidal crystals have been realized on soft lithographically fabricated moire patterns. The interplay between lattice misfit strain and topographically varying surface potential within the moire unit cell significantly alters the nucleation process, and multiple levels of hierarchy can be achieved by tuning the moire angle.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Hidemasa Negoro, Hiroshi Sugimoto, Tatsuki Hinamoto, Minoru Fujii
Summary: A solution-based bottom-up process is developed to produce one- and two-dimensional arrays of densely packed spherical nanoparticles (NPs) of crystalline silicon (Si), which have the lowest order Mie resonance in the visible range. The arrays are formed using a template-assisted self-assembly method and transferred to an arbitrary substrate. The proper formation of Si NP arrays is demonstrated through polarization-resolved scattering spectra measurements and numerical simulations. The results show strong modification of scattering spectra due to near-field coupling of the electric dipole (ED) modes and the Kerker effect.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Shitao Shen, Xiaofeng Qin, Haoqiang Feng, Shuting Xie, Zichuan Yi, Mingliang Jin, Guofu Zhou, Eser Metin Akinoglu, Paul Mulvaney, Lingling Shui
Summary: In this paper, an electromicrofluidic assembly platform (eMAP) is proposed and validated for achieving 3D colloidal assembly within water droplets. By using dielectrophoresis and (di)electrowetting effects, reconfigurable colloidal configurations can be observed and dynamically programmed. This platform allows designable chemical and physical anisotropies for functional materials and devices, and enables high throughput mass production of microcapsules and optoelectronic units.
Article
Chemistry, Multidisciplinary
Longfei Liu, Dake Mao, Zhe Li, Mengxi Zheng, Kai He, Chengde Mao
Summary: Surface-assisted, tile-based DNA self-assembly is a powerful method for constructing large, two-dimensional nanoarrays. Incorporating different types of tiles into one assembly system is challenging due to the differential adsorptions on the solid surface. Our solution to this problem is to engineer the tiles with comparable molecular weights while maintaining their architectures. We have successfully demonstrated this strategy by assembling binary DNA 2D arrays using very different tiles, and we expect it to facilitate the assembly of other complex nanostructures as well.
Article
Chemistry, Multidisciplinary
Xingfu Yang, Ning Wu
Article
Chemistry, Multidisciplinary
Tao Yang, Tonguc O. Tasci, Keith B. Neeves, Ning Wu, David W. M. Marr
Article
Environmental Sciences
Laxmi Dutt Bhatta, Anil Shrestha, Nilhari Neupane, Narpat Singh Jodha, Ning Wu
JOURNAL OF MOUNTAIN SCIENCE
(2019)
Article
Chemistry, Multidisciplinary
Xianwei Zhang, Jingjing Gong, Xingfu Yang, Britanny Slupe, Janice Jin, Ning Wu, Amadeu K. Sum
Article
Engineering, Environmental
Jun Qian, Lei Zhou, Xingfu Yang, Daoben Hua, Ning Wu
JOURNAL OF HAZARDOUS MATERIALS
(2020)
Article
Multidisciplinary Sciences
Tao Yang, Brennan Sprinkle, Yang Guo, Jun Qian, Daoben Hua, Aleksandar Donev, David W. M. Marr, Ning Wu
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Engineering, Environmental
Yang Guo, Jincheng Lou, Jae Kyoung Cho, Nils Tilton, Jaehun Chun, Wooyong Um, Xiaolong Yin, Keith B. Neeves, Ning Wu
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2020)
Article
Chemistry, Multidisciplinary
Joseph R. Maestas, Fuduo Ma, Ning Wu, David T. Wu
Summary: This study explores the mechanism of colloidal particles assembling into quasi-two-dimensional materials under externally applied electric fields. The research identifies previously unobserved structures and proposes a simple method to control the ratio of particles between different planes.
Article
Chemistry, Multidisciplinary
Xingrui Zhu, Yan Gao, Ramona Mhana, Tao Yang, Benjamin L. Hanson, Xingfu Yang, Jingjing Gong, Ning Wu
Summary: Anisotropic particles are used to make micro/nanomotors converting energy into mechanical energy. Most colloidal motors are hard to control but asymmetric dimers under AC electric fields show rich propulsion behaviors. By using orthogonal AC electric field and DC magnetic field, the speed and direction of dimers can be controlled independently, allowing for precise particle motion with complex trajectories. This approach has the potential to create other types of magnetically anisotropic particles and pave the way for assembling them into complex structures.
Article
Chemistry, Multidisciplinary
Ramona Mhanna, Yan Gao, Isaac Van Tol, Ela Springer, Ning Wu, David W. M. Marr
Summary: Magnetic colloidal chains are a versatile microrobotic system with promising applications, known for their biocompatibility and ease of manipulation under magnetic fields. The synthesis of these chains involves controlling their quality, length, and flexibility through various parameters such as linker concentration, reaction temperature, and magnetic field strength. The research findings show that the fabrication process of these chains can be accurately described by the Flory-Schulz model, resembling step-growth polymerization. Furthermore, under optimized conditions, long and flexible colloidal chains with significantly reduced bending modulus compared to previous studies have been successfully synthesized, demonstrating potential for investigating actuation, assembly, and folding behaviors of these polymer analogues.
Article
Chemistry, Analytical
Cui Wu, Linbo Liu, Zunzhong Ye, Jingjing Gong, Pei Hao, Jianfeng Ping, Yibin Ying
Summary: Digital nucleic acid amplification techniques provide sensitive and accurate quantification in biology, and digital loop-mediated isothermal amplification (dLAMP) shows great potential for field detection. However, current systems usually require an auxiliary pump and droplet transfer. In this study, a pump-free microfluidic chip for duplex droplet dLAMP (TriD-LAMP) detection was developed, allowing all stages of the amplification process to be completed without droplet transfer. Combined with optimized fluorescent probe method, this custom chip achieves accurate quantification of E. coli DNA.
ANALYTICA CHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Md Ashraful Haque, Xingrui Zhu, Nomin Uyanga, Ning Wu
Summary: The research aims to create artificial microrobots for various applications by mimicking the efficiency and dynamics of micro-machines in living organisms. By controlling the orientation of micro-objects, the study shows that the symmetry of fluid flow can be broken and propulsion can be achieved using magnetic and electric fields.
Article
Multidisciplinary Sciences
Yan Gao, Brennan Sprinkle, Ela Springer, David W. M. Marr, Ning Wu
Summary: Magnetically controlled soft nano-robots based on Pickering emulsions have the potential to offer targeted drug delivery while avoiding the side effects of systemic delivery. These soft nano-robots can roll like deflated tires, providing a larger contact area with the wall and higher traction compared to rigid counterparts. They can also be reconfigured by changing the external magnetic field, affecting their translation speed and traction.
Article
Automation & Control Systems
Xingfu Yang, Sophia Johnson, Ning Wu
ADVANCED INTELLIGENT SYSTEMS
(2019)