Evaporation-Induced Self-Assembly of Colloidal Particles into Two-Dimensional Array during Drying

2002 ◽  
Author(s):  
Hiroyuki Nishikawa ◽  
Shinya Maenosono ◽  
Yukio Yamaguchi ◽  
Tatsuya Okubo
Keyword(s):  
Self Assembly ◽  
Colloidal Particles ◽  
Two Dimensional ◽  
Dimensional Array ◽  
Evaporation Induced Self Assembly

Size-Dependent Separation of Colloidal Particles In Two-Dimensional Convective Self-Assembly

Langmuir ◽  
1995 ◽  
Vol 11 (8) ◽  
pp. 2975-2978 ◽  
Author(s):  
Mariko Yamaki ◽  
Junichi Higo ◽  
Kuniaki Nagayama
Keyword(s):  
Self Assembly ◽  
Colloidal Particles ◽  
Two Dimensional ◽  
Size Dependent

Fabrication of Photonic Crystals in Microchannels

2004 ◽  
Vol 817 ◽  
Author(s):  
Chun-Wen Kuo ◽  
Hui-Mei Hsieh ◽  
Jung-Chuan Ting ◽  
Yi-Hong Cho ◽  
Kung Hwa Wei ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Expansion Method ◽  
Large Area ◽  
Optical Components ◽  
Colloidal Photonic Crystals ◽  
Fabrication Procedure ◽  
Evaporation Induced Self Assembly ◽  
Easy Integration

AbstractWe have developed a fabrication procedure for growing photonic crystals in the lithographic defined microchannels, which enables easy integration with other planar optical components. This technique is based on the directed evaporation induced self-assembly of nanoparticles in the microchannels. Substrates with pre-patterned microchannels (30-100 μm wide) were dipped into solution of nanoparticles for several days. By controlling the evaporation rate, the meniscus contacting the microchannels will undergo evaporation-induced self-assembly. The capillary forces cause nanospheres to crystallize within the microchannels forming colloidal photonic crystals in the microchannels. Two types of colloidal particles, polystyrene and silica, have been employed to fabricate colloidal photonic crystals in the microchannels. Both types of colloidal particles were found to form large-area well-ordered colloidal single crystals in the microchannels. The optical reflection spectra from the (111) surfaces of the colloidal crystals formed by various sizes of nanoparticles have been measured. And the measured reflection peaks agree with the photonic bandgap calculated by the plane wave expansion method.

Engineering surface defects on two-dimensional ultrathin mesoporous anatase TiO2 nanosheets for efficient charge separation and exceptional solar-driven photocatalytic hydrogen evolution

2020 ◽  
Vol 8 (10) ◽  
pp. 3476-3482 ◽  
Author(s):  
Jiaxing Wu ◽  
Panzhe Qiao ◽  
Haoze Li ◽  
Yachao Xu ◽  
Wutao Yang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Self Assembly ◽  
Charge Separation ◽  
Surface Defects ◽  
Anatase Tio2 ◽  
Two Dimensional ◽  
Photocatalytic Hydrogen Evolution ◽  
Tio2 Nanosheets ◽  
Evaporation Induced Self Assembly ◽  
Efficient Charge

Two-dimensional ultrathin mesoporous anatase TiO2 nanosheets with engineered surface defects are fabricated via evaporation-induced self-assembly, solvothermal and hydrogenation, which exhibit excellent photocatalytic hydrogen evolution.

Defined core–shell particles as the key to complex interfacial self-assembly

2021 ◽  
Vol 118 (52) ◽  
pp. e2113394118
Author(s):  
Johannes Menath ◽  
Jack Eatson ◽  
Robert Brilmayer ◽  
Annette Andrieu-Brunsen ◽  
D. Martin A. Buzza ◽  
...  
Keyword(s):  
Self Assembly ◽  
Colloidal Particles ◽  
Minimum Energy ◽  
Functional Materials ◽  
Core Shell ◽  
Two Dimensional ◽  
Form Complex ◽  
Experimental Realization ◽  
Interfacial Morphology ◽  
Shell Particles

The two-dimensional self-assembly of colloidal particles serves as a model system for fundamental studies of structure formation and as a powerful tool to fabricate functional materials and surfaces. However, the prevalence of hexagonal symmetries in such self-assembling systems limits its structural versatility. More than two decades ago, Jagla demonstrated that core–shell particles with two interaction length scales can form complex, nonhexagonal minimum energy configurations. Based on such Jagla potentials, a wide variety of phases including cluster lattices, chains, and quasicrystals have been theoretically discovered. Despite the elegance of this approach, its experimental realization has remained largely elusive. Here, we capitalize on the distinct interfacial morphology of soft particles to design two-dimensional assemblies with structural complexity. We find that core–shell particles consisting of a silica core surface functionalized with a noncrosslinked polymer shell efficiently spread at a liquid interface to form a two-dimensional polymer corona surrounding the core. We controllably grow such shells by iniferter-type controlled radical polymerization. Upon interfacial compression, the resulting core–shell particles arrange in well-defined dimer, trimer, and tetramer lattices before transitioning into complex chain and cluster phases. The experimental phase behavior is accurately reproduced by Monte Carlo simulations and minimum energy calculations, suggesting that the interfacial assembly interacts via a pairwise-additive Jagla-type potential. By comparing theory, simulation, and experiment, we narrow the Jagla g-parameter of the system to between 0.9 and 2. The possibility to control the interaction potential via the interfacial morphology provides a framework to realize structural features with unprecedented complexity from a simple, one-component system.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

Sign in / Sign up

Export Citation Format

Share Document