scholarly journals Bioinspired hydrogel microfibres colour-encoded with colloidal crystals

2019 ◽  
Vol 6 (9) ◽  
pp. 1938-1943 ◽  
Author(s):  
Zhi-Jun Meng ◽  
Jing Zhang ◽  
Xu Deng ◽  
Ji Liu ◽  
Ziyi Yu ◽  
...  
Keyword(s):  
Colloidal Crystal ◽  
Colloidal Crystals

The integration of microfluidic spinning and colloidal crystal microdots enable the colour-encoded hydrogel microfibres with facile and flexible manipulation of the encoding.

scholarly journals Synthesis of magnetic mesoporous titania colloidal crystals through evaporation induced self-assembly in emulsion as effective and recyclable photocatalysts

2015 ◽  
Vol 17 (41) ◽  
pp. 27653-27657 ◽  
Author(s):  
Jeffrey E. Chen ◽  
Hong-Yuan Lian ◽  
Saikat Dutta ◽  
Saad M. Alshehri ◽  
Yusuke Yamauchi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Self Assembly ◽  
Colloidal Crystal ◽  
Colloidal Crystals ◽  
Mesoporous Titania ◽  
Evaporation Induced Self Assembly

This study illustrates the directed self-assembly of mesoporous TiO2 with magnetic properties due to its colloidal crystal structure with Fe3O4.

scholarly journals Convenient and Efficient Fabrication of Colloidal Crystals Based on Solidification-Induced Colloidal Assembly

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 575 ◽  
Author(s):  
Ting Shao ◽  
Laixi Sun ◽  
Chun Yang ◽  
Xin Ye ◽  
Shufan Chen ◽  
...  
Keyword(s):  
Driving Force ◽  
Crystallization Process ◽  
Colloidal Crystal ◽  
Colloidal Crystals ◽  
Magnetic Interaction ◽  
Colloidal Assembly ◽  
Water Suspension ◽  
Colloidal Crystallization ◽  
New Strategy ◽  
Crystal Grains

The simple yet efficient and versatile fabrication of colloidal crystals was investigated based on the solidification-induced colloidal crystallization process with particle/water suspension as precursor. The resulting colloidal crystals were constituted by crystal grains with sizes ranging from several tens of micrometers to a few millimeters. Each of the grains had a close-hexagonal array of colloids, which endowed the bulk colloidal crystal powders with some specific optical properties. The freezing of water was shown as the major driving force to form colloidal crystal grains, which supersaturated the solution with nanoparticles and thus induced the formation and growth of colloidal crystal seeds. This process is intrinsically different from those conventional methods based on shearing force, surface tension, columbic interaction or magnetic interaction, revealing a new strategy to fabricate colloidal crystals in a convenient and efficient way.

scholarly journals Colloidal crystals of compliant microgel beads to study cell migration and mechanosensitivity in 3D

Soft Matter ◽  
2019 ◽  
Vol 15 (47) ◽  
pp. 9776-9787 ◽  
Author(s):  
Katrin Wagner ◽  
Salvatore Girardo ◽  
Ruchi Goswami ◽  
Gonzalo Rosso ◽  
Elke Ulbricht ◽  
...  
Keyword(s):  
Cell Migration ◽  
Colloidal Crystal ◽  
Colloidal Crystals ◽  
Variable Stiffness ◽  
Ecm Proteins

We present a novel 3D colloidal crystal made of polyacrylamide microgel beads with variable stiffness. The beads can be functionalized with ECM proteins and used to study mechanosensing responses of cells to varying stiffness in a 3D context.

scholarly journals Ordering of binary colloidal crystals by random potentials

Soft Matter ◽  
2020 ◽  
Vol 16 (17) ◽  
pp. 4267-4273 ◽  
Author(s):  
André S. Nunes ◽  
Sabareesh K. P. Velu ◽  
Iryna Kasianiuk ◽  
Denis Kasyanyuk ◽  
Agnese Callegari ◽  
...  
Keyword(s):  
Random Potential ◽  
Colloidal Crystal ◽  
Colloidal Crystals ◽  
Random Potentials

A random potential can control the number of defects in a binary colloidal crystal.

scholarly journals Particle analogs of electrons in colloidal crystals

Science ◽  
2019 ◽  
Vol 364 (6446) ◽  
pp. 1174-1178 ◽  
Author(s):  
Martin Girard ◽  
Shunzhi Wang ◽  
Jingshan S. Du ◽  
Anindita Das ◽  
Ziyin Huang ◽  
...  
Keyword(s):  
Colloidal Crystal ◽  
Colloidal Crystals ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Design Rules ◽  
Metal Insulator ◽  
Grafting Density ◽  
And Diffusion ◽  
Classical Picture

A versatile method for the design of colloidal crystals involves the use of DNA as a particle-directing ligand. With such systems, DNA-nanoparticle conjugates are considered programmable atom equivalents (PAEs), and design rules have been devised to engineer crystallization outcomes. This work shows that when reduced in size and DNA grafting density, PAEs behave as electron equivalents (EEs), roaming through and stabilizing the lattices defined by larger PAEs, as electrons do in metals in the classical picture. This discovery defines a new property of colloidal crystals—metallicity—that is characterized by the extent of EE delocalization and diffusion. As the number of strands increases or the temperature decreases, the EEs localize, which is structurally reminiscent of a metal-insulator transition. Colloidal crystal metallicity, therefore, provides new routes to metallic, intermetallic, and compound phases.

scholarly journals Gravitational Annealing of Colloidal Crystals

2012 ◽  
Vol 323-325 ◽  
pp. 555-558 ◽  
Author(s):  
Yoshihisa Suzuki ◽  
Jin Endoh ◽  
Atsushi Mori ◽  
Tomoki Yabutani ◽  
Katsuhiro Tamura
Keyword(s):  
Colloidal Crystal ◽  
Colloidal Crystals ◽  
Polarized Light ◽  
The Other ◽  
High Gravity ◽  
Silica Colloidal Crystal

A silica colloidal crystal obtained by centrifugation at 9 G for 2 days in water was annealed by additional stronger centrifugation at 50 G for 5 days. The number of the striations observed in the colloidal crystal under crossed polarized light decreased at some parts in a growth container after the additional centrifugation, while the number also increased at the other parts. The decrease probably shows the shrinkage of the stacking disorders under high gravity, while the increase probably shows the production of new stacking disorders.

A New Approach for Colloidal Crystal Fabrication with the Template of Reversible Stress Wrinkle

2011 ◽  
Vol 418-420 ◽  
pp. 651-655
Author(s):  
Qing Xu ◽  
Zhao Ting Yang ◽  
Chao Rong Li ◽  
Ben Yong Chen ◽  
Wen Jun Dong
Keyword(s):  
Large Scale ◽  
Colloidal Crystal ◽  
Colloidal Crystals ◽  
Optical Microscope ◽  
Pdms Substrate ◽  
Mass Ratio ◽  
New Approach ◽  
Defect Rate ◽  
Regular Spacing ◽  
Scanning Electron

Wrinkle is a favorable template for patterning cells or particles. A new approach is developed to control and fabricate PS colloidal crystals with the reversible wrinkle on PDMS substrate/Pt film stressed system. The obtained structure is characterized by optical microscope and scanning electron microscope. It demonstrates that the settlement of colloids can be regulated by the buckling wavelength which can be tuned by varying the film thickness and substrate mixture mass ratio. Compared with monolayer PS film patterned on herringbones pattern wrinkle, the film on stripes pattern wrinkle always has low defect rate. It is meaningful for fabricating large-scale regular spacing and high-ordered PS colloid films.

Photosensitive polystyrene/silver bromide hybrid colloidal crystals as recoverable colorimetric naked eye probes for bromine gas sensing

2016 ◽  
Vol 4 (7) ◽  
pp. 1386-1391 ◽  
Author(s):  
Bing Yu ◽  
Feng Zhai ◽  
Hailin Cong ◽  
Di Yang
Keyword(s):  
Linear Relationship ◽  
Gas Sensing ◽  
Colloidal Crystal ◽  
Colloidal Crystals ◽  
Silver Bromide ◽  
Gas Concentration ◽  
Naked Eye ◽  
Light Yellow ◽  
Reliable Performance ◽  
Deep Green

The color of a hybrid colloidal crystal sensor is changed from deep green to light yellow with increased bromine gas concentrations with a linear relationship between the band gap shift and bromine gas concentration. The sensor has a very reliable performance after repeated sensing and regeneration.

scholarly journals Preparation, Properties, and Self-Assembly Behavior of PTFE-Based Core-Shell Nanospheres

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Katia Sparnacci ◽  
Diego Antonioli ◽  
Simone Deregibus ◽  
Michele Laus ◽  
Giampaolo Zuccheri ◽  
...  
Keyword(s):  
Particle Size ◽  
Self Assembly ◽  
Colloidal Crystal ◽  
Colloidal Crystals ◽  
Direct Consequence ◽  
Core Shell ◽  
Precise Control ◽  
Assembly Behavior ◽  
Shell Particles ◽  
High Degree

Nanosized PTFE-based core-shell particles can be prepared by emulsifier-free seed emulsion polymerization technique starting from spherical or rod-like PTFE seeds of different size. The shell can be constituted by the relatively high Tg polystyrene and polymethylmethacrylate as well as by low Tg polyacrylic copolymers. Peculiar thermal behavior of the PTFE component is observed due to the high degree of PTFE compartmentalization. A very precise control over the particle size can be exerted by properly adjusting the ratio between the monomers and the PTFE seed. In addition, the particle size distribution self-sharpens as the ratio monomer/PTFE increases. Samples with uniformity ratios suited to build 2D and 3D colloidal crystals are easily prepared. In particular, 2D colloidal crystal of spheres leads to very small 2D nanostructuration, useful for the preparation of masks with a combination of nanosphere lithography and reactive ion etching. 3D colloidal crystals were also obtained featuring excellent opal quality, which is a direct consequence of the monodispersity of colloids used for their growth.

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