Colloidal Crystal Templating of Two-Dimensional Ordered Macroporous SiCN Ceramics

2008 ◽  
Vol 135 ◽  
pp. 27-30 ◽  
Author(s):  
In Hyuck Song ◽  
Yong Jin Kim ◽  
Hai Doo Kim ◽  
Dong Pyo Kim
Keyword(s):  
Colloidal Silica ◽  
Colloidal Crystal ◽  
Low Molecular Weight ◽  
Two Dimensional ◽  
Preceramic Polymer ◽  
Si Substrates ◽  
N2 Atmosphere ◽  
Colloidal Crystal Templating ◽  
Ordered Macroporous ◽  
Silica Crystals

In this study, two-dimensional (2D) ordered macroporous SiCN ceramics were prepared by infiltrating sacrificial colloidal silica (SiO2) templates with the low molecular weight preceramic polymer, polysilazane. This was followed by a thermal curing step, pyrolysis at 1250°C in a N2 atmosphere, and finally the removal of the templates by etching with diluted HF. In particular, 100large-scale monolayer silica crystals were prepared on the cleaned Si substrates by spin coating. Two-dimensional SiCN ordered pore arrays were fabricated by a solution-dipping template strategy.

Preparation of Three Dimensionally Ordered Macroporous Li4Ti5O12 Electrode

2006 ◽  
Vol 320 ◽  
pp. 263-266 ◽  
Author(s):  
Sang Wook Woo ◽  
Kaoru Dokko ◽  
Kiyoshi Kanamura
Keyword(s):  
Discharge Capacity ◽  
Colloidal Crystal ◽  
Titanium Isopropoxide ◽  
Crystallographic Structure ◽  
Uniform Size ◽  
Inverse Opal Structure ◽  
Prepared Material ◽  
Monodisperse Polystyrene ◽  
Colloidal Crystal Templating ◽  
Ordered Macroporous

Three dimensionally ordered macroporous (3DOM) Li4Ti5O12 was successfully prepared by a colloidal crystal templating process. Colloidal crystal consisting of monodisperse polystyrene particles (1 9m diameter) was used as a template for the synthesis of macroporous Li4Ti5O12. A precursor sol consisting of titanium isopropoxide and lithium acetate was injected into the template, and it was calcined at high temperatures. A macroporous membrane of Li4Ti5O12 with inverse-opal structure was obtained. The prepared material had a spinel-related crystallographic structure. The interconnected pores with uniform size (0.8 9m) were clearly observed on entire part of the membrane. The electrochemical properties of the 3DOM Li4Ti5O12were characterized with cyclic voltammetry and glavanostatic charge-discharge in an organic electrolyte containing a lithium salt. 3DOM Li4Ti5O12 exhibited a discharge capacity of 160 mA h g-1 at the electrode potential of 1.55 V vs. Li/Li+ due to the solid state redox of Ti3+/4+ accompanying with Li+ ion insertion and extraction. The discharge capacity was close to the theoretical capacity (167 mA h g-1). This means that the Li+ insertion and extraction took place at all part of the 3DOM Li4Ti5O12 membrane.

Facile synthesis of three-dimensionally ordered macroporous silicon-doped La0.8K0.2CoO3 perovskite catalysts for soot combustion

2016 ◽  
Vol 6 (21) ◽  
pp. 7718-7728 ◽  
Author(s):  
Nengjie Feng ◽  
Chong Chen ◽  
Jie Meng ◽  
Yang Wu ◽  
Geng Liu ◽  
...  
Keyword(s):  
Colloidal Crystal ◽  
Macroporous Silicon ◽  
Macroporous Structure ◽  
Soot Combustion ◽  
Facile Synthesis ◽  
Templating Method ◽  
Perovskite Catalysts ◽  
Colloidal Crystal Templating ◽  
Ordered Macroporous ◽  
Silicon Doped

Three-dimensionally ordered macroporous (3DOM) silicon-doped La0.8K0.2CoO3 perovskite catalysts were successfully prepared by a colloidal crystal templating method. The catalysts showed a well-ordered macroporous structure and exhibited high activity for soot removal.

Preparation of Large-Area 3D Ordered Macroporous Titania Films by Silica Colloidal Crystal Templating.

ChemInform ◽  
2003 ◽  
Vol 34 (12) ◽  
Author(s):  
Sulan Kuai ◽  
Simona Badilescu ◽  
Georges Bader ◽  
Ralf Bruening ◽  
Xingfang Hu ◽  
...  
Keyword(s):  
Colloidal Crystal ◽  
Large Area ◽  
Titania Films ◽  
Colloidal Crystal Templating ◽  
Ordered Macroporous ◽  
Silica Colloidal Crystal ◽  
Macroporous Titania Films
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