ChemInform Abstract: Template-Assisted Self-Assembly and Cobalt Doping of Ordered Mesoporous Titania Nanostructures.

ChemInform ◽  
2010 ◽  
Vol 30 (28) ◽  
pp. no-no
Author(s):  
Jin Song Yin ◽  
Zhong L. Wang
Keyword(s):  
Self Assembly ◽  
Mesoporous Titania ◽  
Cobalt Doping ◽  
Ordered Mesoporous ◽  
Titania Nanostructures

scholarly journals Spray Deposition Synthesis of Locally Ordered Mesoporous Polycrystalline Titania Films at Low Temperature

Molecules ◽  
2022 ◽  
Vol 27 (1) ◽  
pp. 303
Author(s):  
Gunnar Símonarson ◽  
Antiope Lotsari ◽  
Anders E. C. Palmqvist
Keyword(s):  
Low Temperature ◽  
Aging Time ◽  
Self Assembly ◽  
Spray Deposition ◽  
Spray Coating ◽  
Mesoporous Titania ◽  
Structure Directing Agent ◽  
Synthesis Time ◽  
Ordered Mesoporous ◽  
Titania Films

A low-temperature spray deposition synthesis was developed to prepare locally hexagonally ordered mesoporous titania films with polycrystalline anatase pore walls in an evaporation-induced self-assembly process. The titania film preparation procedure is conducted completely at temperatures below 50 °C. The effects of spray time, film thickness, synthesis time prior to spray deposition, and aging time at high relative humidity after deposition on the atomic arrangement and the mesoorder of the mesoporous titania were studied. We find the crystallite size to depend on both the synthesis time and aging time of the films, where longer times result in larger crystallites. Using the photocatalytic activity of titania, the structure-directing agent is removed with UV radiation at 43–46 °C. The capability of the prepared films to remove the polymer template increased with longer synthesis and aging times due to the increased crystallinity, which increases the photocatalytic efficiency of the titania films. However, with increasingly longer times, the crystallites grow too large for the mesoorder of the pores to be maintained. This work shows that a scalable spray coating method can be used to prepare locally ordered mesoporous polycrystalline titania films by judiciously tuning the synthesis parameters.

Self-Assembling Of Ordered Mesoporous Titania Nanostructures

1999 ◽  
Vol 5 (S2) ◽  
pp. 194-195
Author(s):  
J.S. Yin ◽  
Z.L. Wang
Keyword(s):  
Self Assembly ◽  
Chemical Properties ◽  
Cobalt Doping ◽  
New Techniques ◽  
Titanium Butoxide ◽  
Self Assembling ◽  
Large Bulk ◽  
Ordered Mesoporous ◽  
Porous Titania ◽  
Physical And Chemical

Ordered self-assembly of nanocrystals is scientifically interesting due to not only the unique properties of the nanocrystals, but also the collective properties of the assembly. Compared to lithography method, self-assembly is limited by a lack of control over the sizes of the ordered arrays, resulting in difficulties in characterizing their physical and chemical properties. New techniques are needed to manipulate the self-assembling process and the nanostructures formed.In this work, polystyrene (PS) spheres were used as the template to form large bulk ordered anatase nanostructure with cobalt doping. The ordered PS template was infiltrated with absolute alcohol solution of titanium butoxide. After the precursor was dried, it was treated at 160°C for 5 hours and then at 450°C for another 5 hours. To dope cobalt into the structure, the porous titania host was immersed in a heptane solution with cobalt carbonyl. After drying in vacuum at room temperature, it was treated at 160°C.

scholarly journals Ordered mesoporous titania from highly amphiphilic block copolymers: tuned solution conditions enable highly ordered morphologies and ultra-large mesopores

2015 ◽  
Vol 3 (21) ◽  
pp. 11478-11492 ◽  
Author(s):  
Morgan Stefik ◽  
Juho Song ◽  
Hiroaki Sai ◽  
Stefan Guldin ◽  
Patrick Boldrighini ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Molar Mass ◽  
Amphiphilic Block Copolymers ◽  
Mesoporous Titania ◽  
High Molar Mass ◽  
Ordered Mesoporous ◽  
Titania Nanostructures ◽  
Large Mesopores ◽  
Triblock Terpolymers

Solubility guidelines enable the use of high molar mass block copolymers and ABC triblock terpolymers for the coassembly of titania nanostructures.

Ordered Mesoporous Materials from Metal Nanoparticle-Block Copolymer Self-Assembly

Science ◽  
2008 ◽  
Vol 320 (5884) ◽  
pp. 1748-1752 ◽  
Author(s):  
S. C. Warren ◽  
L. C. Messina ◽  
L. S. Slaughter ◽  
M. Kamperman ◽  
Q. Zhou ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Mesoporous Materials ◽  
Self Assembly ◽  
Metal Nanoparticle ◽  
Ordered Mesoporous Materials ◽  
Ordered Mesoporous

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 STUDY OF THE FORMATION OF MESOPOROUS TiO2 USING ISOPROPOXIDE PRECURSORS UNDER LESS WATER CONDITIONS

2010 ◽  
Vol 5 (1) ◽  
pp. 15-22 ◽  
Author(s):  
Indriana Kartini ◽  
Gao Qing Lu
Keyword(s):  
Self Assembly ◽  
Isopropyl Alcohol ◽  
Molar Ratio ◽  
Mesoporous Titania ◽  
Synthesis Parameters ◽  
Water Conditions ◽  
Evaporation Induced Self Assembly ◽  
Added Water ◽  
Templating Synthesis

The role of the synthesis parameters (the molar ratio of template, isopropyl alcohol, acetylacetone, and water with respect to titanium(IV) tetraisopropoxide) has been thoroughly investigated to understand their effects on the mesostructures and the formation of crystalline phases of mesoporous titania xerogels in less water condition (no added water) at 60 oC. The resultant mesoporous titania are more likely to have worm-hole like structure as the dominant stable structure. The template appears to play no significant role in structure directing at mesophase level. However, increasing the amount of the template delays the formation of anatase crystalline phase   Keywords: mesoporous titania, templating synthesis, anatase, evaporation-induced self-assembly

Sign in / Sign up

Export Citation Format

Share Document