Concentrated crystallization of closely packed colloidal crystal films from aqueous suspension immersed in silicone oil

2010 ◽  
Vol 1273 ◽  
Author(s):  
Hiroshi Fudouzi ◽  
Tsutomu Sawada ◽  
Lucien Brush
Keyword(s):  
Self Assembly ◽  
Silicone Oil ◽  
Colloidal Crystal ◽  
Colloidal Suspension ◽  
Aqueous Suspension ◽  
Optical Microscope ◽  
Close Packed Structure ◽  
Crystal Film ◽  
Crystal Films ◽  
Working Distance

AbstractColloidal crystals have been attracting much attention due to their novel use as 3D-photonic crystals and to their structural color. We have been developing a method for the colloidal crystal growth of opal films immersed in silicone oil. This method is one of the evaporative self-assembly techniques for opal films from colloidal particle suspensions. Understanding the mechanism of the process is important to assure the coating of high-quality opal thin films. The colloidal crystallization from suspension was observed with a long working distance optical microscope and Bragg's diffraction peaks were measured with a miniature fiber optic spectrometer. The transition from a non-crystalline to a crystalline phase is observed within a region between the disordered colloidal suspension and the colloidal crystal film. Within this region, that spans a distance of about 400μm, the lattice of the colloidal crystal reduces until it transitions to the close-packed structure.

scholarly journals Fabrication of Structural-Coloured Carbon Fabrics by Thermal Assisted Gravity Sedimentation Method

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1133
Author(s):  
Jiali Yu ◽  
Cheng Hao Lee ◽  
Chi-Wai Kan ◽  
Shixin Jin
Keyword(s):  
Traffic Safety ◽  
Self Assembly ◽  
Optical Microscope ◽  
Chemical Information ◽  
Sedimentation Method ◽  
Emulsion Polymerisation ◽  
Before And After ◽  
Crystal Films ◽  
Gravity Sedimentation ◽  
Carbon Fabrics

Structural-coloured poly(styrene-methyl methacrylate-acrylic acid) (Poly(St-MMA-AA)) deposited carbon fabrics (Poly(St-MMA-AA)/PCFs) with fascinating colours (salmon, chartreuse, springgreen, skyblue, mediumpurple) changing with the (Poly(St-MMA-AA) nanoparticle sizes can be facilely fabricated by the thermal-assisted gravity sedimentation method that facilitates the self-assembly of Poly(St-MMA-AA) colloidal nanoparticles to generate photonic crystals. The particle sizes of Poly(St-MMA-AA) copolymer with core/shell structure varying from 308.3 nm to 213.1 nm were controlled by adjusting the amount of emulsifier during emulsion polymerisation. The presence of the intrinsic chemical information of Poly(St-MMA-AA) copolymer has been ascertained by Raman and Fourier Transform Infrared (FT-IR) Spectroscopy analysis. Colour variation of the as-prepared structural-coloured carbon fabrics (Poly(St-MMA-AA)/PCFs) before and after dipping treatment were captured while using an optical microscope. The structural colours of Poly(St-MMA-AA)/PCFs were assessed by calculating the diffraction bandgap according to Bragg’s and Snell’s laws. The Poly(St-MMA-AA) photonic crystal films altered the electrical properties of carbon fabrics with the resistivity growing by five orders of magnitude. The differential electrical resistivity between Poly(St-MMA-AA)/PCFs and wet Poly(St-MMA-AA)/PCFs combined with the corresponding tunable colours can be potentially applied in several promising areas, such as smart displays, especially signal warning displays for traffic safety.

Facile fabrication of free-standing colloidal-crystal films by interfacial self-assembly

2011 ◽  
Vol 353 (1) ◽  
pp. 16-21 ◽  
Author(s):  
Jianan Zhang ◽  
Mozhen Wang ◽  
Xuewu Ge ◽  
Mingyuan Wu ◽  
Qingyun Wu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Colloidal Crystal ◽  
Free Standing ◽  
Crystal Films ◽  
Facile Fabrication

Self-assembly of microspheres at the air/water/air interface into free-standing colloidal crystal films

Soft Matter ◽  
2007 ◽  
Vol 3 (1) ◽  
pp. 68-70 ◽  
Author(s):  
Zhong-Ze Gu ◽  
Dayang Wang ◽  
Helmuth Möhwald
Keyword(s):  
Self Assembly ◽  
Colloidal Crystal ◽  
Free Standing ◽  
Air Interface ◽  
Crystal Films

Ultrathin polymer gel-infiltrated monolayer colloidal crystal films for rapid colorimetric chemical sensing

RSC Advances ◽  
2016 ◽  
Vol 6 (70) ◽  
pp. 66191-66196 ◽  
Author(s):  
Shimo Yu ◽  
Zhiming Han ◽  
Xiuling Jiao ◽  
Dairong Chen ◽  
Cheng Li
Keyword(s):  
Chemical Sensing ◽  
Colloidal Crystal ◽  
Polymer Gel ◽  
Crystal Film ◽  
Crystal Films ◽  
Ph Variations

The ultrathin polymer gel-infiltrated monolayer colloidal crystal film shows rapid, linear, reversible, and colorimetric responses to pH variations.

scholarly journals Effect of A Limited Amount of D-Sorbitol on Pitch and Mechanical Properties of Cellulose Nanocrystal Films

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1324
Author(s):  
Xiao-Yao Wei ◽  
Tao Lin ◽  
Le Wang ◽  
Xue-Feng Yin
Keyword(s):  
Mechanical Properties ◽  
Self Assembly ◽  
Aqueous Suspension ◽  
Young Modulus ◽  
Cellulose Nanocrystal ◽  
Chiral Structure ◽  
Liquid Crystal Films ◽  
Significant Difference ◽  
Crystal Films ◽  
Nanocrystal Films

A cellulose nanocrystal (CNC) suspension can form liquid crystal films with unique self-assembly behaviors. This gives CNC films a special iridescence, which has potential in many aspects, but the brittleness of pure CNC films limits their application. In this work, we propose a simple physical mixing method to obtain CNC film by adding D-sorbitol as a plasticizer. We first found that low D-sorbitol content (less than 6 wt% in CNC/DS composite solution) did not make a significant difference compared with pure CNC films in optical performance and, at the same time, the mechanical properties of the CNC films were improved. The various low contents of D-sorbitol can be well dispersed in CNC aqueous suspension, and the wavelength of the selectively reflected phenomenon is relatively stable and slightly decreased at 5 nm for concentrations from 0 to 6%. This phenomenon is opposite to that generally reported, where the wavelength of the selective reflected phenomenon increases obviously with the increase in plastic content. The pitch of the chiral structure decreased from 406 to 362 nm with an increase in D-sorbitol concentration. When the content of D-sorbitol reached 4%, the tensile strength, elongation at break, and Young modulus increased to 39.9 Mpa, 3.00%, and 2.99 GPa, respectively.

Self-Assembly of Large Scale and High-Quality Colloidal Particle Films by Spin-Coating

2011 ◽  
Vol 418-420 ◽  
pp. 876-879
Author(s):  
Zhao Ting Yang ◽  
Qing Xu ◽  
Chao Rong Li
Keyword(s):  
Self Assembly ◽  
Spin Coating ◽  
Large Scale ◽  
Colloidal Particle ◽  
Colloidal Crystal ◽  
Aqueous Suspension ◽  
Hexagonal Structure ◽  
Large Area ◽  
Coating Method ◽  
Optical Applications

Colloidal crystal has attracted much attention both in fundamental crystal growth science and optical applications. This paper reports a simple and efficiency spin-coating method to fabricate high ordered colloidal crystals which have specific structures. We used the cleaned glass slide as substrates, the well dispersity 300nm (±1.2%) polystyrene (PS) spheres aqueous suspension (6.6 wt%) to assemble, and obtained highly organized colloidal crystal thin film by controlling spin-coating condition. Mostly, we got the large area plane hexagonal structure at the first layer and tetragonal construction at the second layer. The mechanism for this stacking way was studied. The obtained thin films were demonstrated by Field emission scanning electron microscope (FESEM) and Fast Fourier transform (FFT).

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