Flexible and Ordered Macroporous PMMA Polymers Films

2011 ◽  
Vol 306-307 ◽  
pp. 1645-1648
Author(s):  
Li Er Deng ◽  
Yong Sheng Wang ◽  
Ming Fu
Keyword(s):  
Hydrofluoric Acid ◽  
Colloidal Crystals ◽  
Polymerization Reaction ◽  
Silica Spheres ◽  
Free Standing ◽  
Colloidal Spheres ◽  
Potential Applications ◽  
Photoelectronic Device ◽  
Ordered Macroporous

The ordered colloidal crystals were prepared by sedimentation of a solution of silica colloidal spheres of 298nm. Colloidal crystals were obtained after evaporation at 50°Cfor eight days while solution evaporates. These colloidal crystals were used to be templates and MMA was filled in the gap of silica spheres. SiO2/PMMA structures with a overlayer of PMMA were obtained by polymerization reaction carried out at 80°C for 24 h. After etched with the hydrofluoric acid (HF) for 24h, a piece of bluish violet film can be obtained. The film is flexible and free-standing and is enough tough to be curled to various shape. This kind of film can extend the usage of macroporous structures and have various potential applications in flexible photoelectronic device.

Structure and Transmission Spectra for Colloidal Crystals with Silica Spheres

1998 ◽  
Vol 15 (1) ◽  
pp. 21-23 ◽  
Author(s):  
Dong-bin Mei ◽  
Peng Dong ◽  
Hong-qiang Li ◽  
Bing-ying Cheng ◽  
Dao-zhong Zhang
Keyword(s):  
Colloidal Crystals ◽  
Silica Spheres ◽  
Transmission Spectra

scholarly journals Controlled assembly of single colloidal crystals using electro-osmotic micro-pumps

2017 ◽  
Vol 19 (4) ◽  
pp. 3104-3114 ◽  
Author(s):  
Ran Niu ◽  
Erdal C. Oğuz ◽  
Hannah Müller ◽  
Alexander Reinmüller ◽  
Denis Botin ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Glass Substrate ◽  
Colloidal Crystals ◽  
Controlled Assembly ◽  
Colloidal Spheres

We assemble charged colloidal spheres at deliberately chosen locations on a charged unstructured glass substrate utilizing ion exchange based electro-osmotic micro-pumps.

In Situ Visualization of Layer Transitions during Convective Self-Assembly in a Sessile Drop

2007 ◽  
Vol 31 ◽  
pp. 117-119
Author(s):  
Li Gao ◽  
Qing Feng Yan ◽  
C.C. Wong ◽  
Yet Ming Chiang
Keyword(s):  
Self Assembly ◽  
Sessile Drop ◽  
Three Dimensional ◽  
Colloidal Crystals ◽  
Layer Transition ◽  
Simple Method ◽  
Colloidal Spheres ◽  
In Situ Visualization ◽  
Set Up

Convective self-assembly of colloidal spheres provides a simple method for fabricating two and three dimensional colloidal crystals. In this work, we investigated the layer transitions phenomena during colloidal self-assembly in a sessile drop by using an in-situ videoscopic set-up. The effects of surface charge, colloidal concentration, and surfactant additions were examined. The results show that the chemical environment plays an important role in colloidal self-assembly. In the case of ordered growth, different layer transition phenomena were observed when the colloidal concentration is different.

scholarly journals Hierarchical Structures and Shaped Particles of Bioactive Glass and ItsIn VitroBioactivity

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
U. Boonyang ◽  
F. Li ◽  
A. Stein
Keyword(s):  
Body Temperature ◽  
Simulated Body Fluid ◽  
Bioactive Glass ◽  
Body Fluid ◽  
Colloidal Crystals ◽  
Hierarchical Structures ◽  
The Other ◽  
Bioactive Glasses ◽  
Ordered Macroporous

In this study, bioactive glass particles with controllable structure and porosity were prepared using dual-templating methods. Block copolymers used as one template component produced mesopores in the calcined samples. Polymer colloidal crystals as the other template component yielded either three-dimensionally ordered macroporous (3DOM) products or shaped bioactive glass nanoparticles. Thein vitrobioactivity of these bioactive glasses was studied by soaking the samples in simulated body fluid (SBF) at body temperature (37°C) for varying lengths of time and monitoring the formation of bone-like apatite on the surface of the bioactive glass. A considerable bioactivity was found that all of bioactive glass samples have the ability to induce the formation of an apatite layer on its surface when in contact with SBF. The development of bone-like apatite is faster for 3DOM bioactive glasses than for nanoparticles.

SEM and TEM of Metallic Inverse Opals

2000 ◽  
Vol 6 (S2) ◽  
pp. 70-71
Author(s):  
C.F. Blanford ◽  
H.W. Yan ◽  
A. Stein ◽  
C.B. Carter
Keyword(s):  
Hydrofluoric Acid ◽  
Colloidal Crystal ◽  
Porous Solids ◽  
Wall Structure ◽  
Silica Spheres ◽  
Inverse Opal ◽  
Inverse Opals ◽  
Synthetic Opals ◽  
Monodisperse Spheres ◽  
Polymer Spheres

Drawing on nature, synthetic opals (e.g., gilsonite) consist of uniformly sized ceramic spheres ordered into large close-packed domains. In order to improve the toughness or appearance of these chemically bonded ceramics, a polymer is often infiltrated into the interconnected space between the packed spheres. In a similar fashion, colloidal crystal arrays of submicrometer silica or polymer spheres have been employed as templates for periodic porous solids. All the methods for preparing periodic macroporous materials share a common synthetic thread: first, the colloidal crystals are formed from monodisperse spheres; next, the void spaces are filled and solidified; finally, the template is removed by heat, by refluxing in a solvent such as THF (in the case of polymer spheres), or by soaking in hydrofluoric acid (in the case of silica spheres). The product, which can be thought of as an “inverse opal,” often exhibits the same iridescence as a natural opal due to the similarity between the periodicity of the wall structure and the wavelength of light.

Drying dissipative structures of colloidal crystals of silica spheres coated with polymer brushes of poly(carboxymethyl betaine)

2010 ◽  
Vol 288 (12-13) ◽  
pp. 1233-1243 ◽  
Author(s):  
Tsuneo Okubo ◽  
Hisatomo Suzuki ◽  
Hiromi Kitano ◽  
Kohji Ohno ◽  
Masashi Mizutani ◽  
...  
Keyword(s):  
Polymer Brushes ◽  
Colloidal Crystals ◽  
Dissipative Structures ◽  
Silica Spheres

Highly Ordered Macroporous BN-Based Ceramics Prepared from Templated Preceramic Polymers

2005 ◽  
Vol 287 ◽  
pp. 323-328 ◽  
Author(s):  
Lan Young Hong ◽  
Dong Pyo Kim
Keyword(s):  
Weight Loss ◽  
Pore Structure ◽  
Colloidal Silica ◽  
Three Dimensional ◽  
Silica Spheres ◽  
Preceramic Polymers ◽  
Surface Areas ◽  
Resistance To Oxidation ◽  
Ordered Macroporous ◽  
Crystalline Array

Macroporous SiCBN and BCN ceramic were prepared by infiltrating these preceramic polymers into the colloidal silica crystalline array, followed by pyrolysis at 1400ı and subsequently etching off the silica spheres. It is generally observed by SEM and TEM that a highly ordered and interconnected 'honeycomb' pore structure was obtained by replicating the three dimensional close packed silica spheres which was fabricated by natural sedimentation. And BET surface areas in range 413 ~ 315 m2/g and pore sizes of 113 ~ 395 nm in the porous materials were tailored by controlling the sacrificial silica sphere sizes in range 145~500 nm even under volume shrinkage involved during pyrolytic step. The porous SiCBN ceramics and BCN ceramic showed a slight weight loss of 0.2~0.8% and 4%, respectively, indicating excellent resistance to oxidation.

3D ordered macroporous MoO2 attached on carbonized cloth for high performance free-standing binder-free lithium–sulfur electrodes

2019 ◽  
Vol 7 (42) ◽  
pp. 24524-24531 ◽  
Author(s):  
Yu-Si Liu ◽  
Xin Liu ◽  
Shu-Mao Xu ◽  
Yu-Lin Bai ◽  
Chao Ma ◽  
...  
Keyword(s):  
High Performance ◽  
Free Standing ◽  
Structural Robustness ◽  
Binder Free ◽  
Nonwoven Cloth ◽  
Ordered Macroporous ◽  
Lithium Sulfur ◽  
High Sulfur Loading

A free-standing Li–S electrode was fabricated based on the in situ growth of 3DOM MoO2 on carbonized nonwoven cloth. The Li–S electrode with high sulfur loading exhibits superior storage capability and structural robustness.

scholarly journals Free-standing Ti3C2Txelectrode with ultrahigh volumetric capacitance

RSC Advances ◽  
2017 ◽  
Vol 7 (20) ◽  
pp. 11998-12005 ◽  
Author(s):  
Qishan Fu ◽  
Jing Wen ◽  
Na Zhang ◽  
Lili Wu ◽  
Mingyi Zhang ◽  
...  
Keyword(s):  
Electronic Devices ◽  
Free Standing ◽  
Potential Applications ◽  
Volumetric Capacitance

The flexible and free-standing paper electrode with ultrahigh volumetric performance and outstanding stability was prepared based on the layered 2D Ti3C2Tx, which demonstrates the potential applications in small-sized electronic devices.

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