scholarly journals In-situ investigations of the photoluminescence properties ofSiO2/TiO2binary and Boron-SiO2/TiO2ternary oxides prepared by the sol-gel method and their photocatalytic reactivity for the oxidative decomposition of trichloroethylene

2003 ◽  
Vol 5 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Kyeong Youl Jung ◽  
Seung Bin Park ◽  
Masaya Matsuoka ◽  
Masakazu Anpo
Keyword(s):  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Quenching Efficiency ◽  
Ft Ir ◽  
The Difference ◽  
Relationship Of ◽  
The Relationship ◽  
Photoluminescence Behavior

Photoluminescence behavior ofTiO2,SiO2/TiO2binary and Boron-SiO2/TiO2ternary oxides prepared by the sol-gel method was investigated. The differences in their photocatalytic reactivities ofTiO2-based photocatalysts were interpreted in terms of the relationship of the difference in their photoluminescence characteristics. The addition ofSiO2intoTiO2matrix induced new photoluminescence sites, which were due to anchored titanium oxide species (i.e., the formation of Ti–O–Si bonds) located on the surface. The photoluminescence was found to be very sensitive to the presence of oxygen. These new photoluminescence completely disappeared by the addition of boron intoSiO2/TiO2binary oxide, since the emitting sites having a Ti–O–Si bond were destroyed and the new sites having B–O–Ti or Si–O–B bonds were constructed on the surface, being in agreement with the results obtained by FT-IR measurements. For allTiO2-based photocatalysts, a significant quenching of photoluminescence was observed by the addition of oxygen. It was found that the photocatalytic reactivity ofTiO2-based photocatalysts for the decomposition of trichloroethylene was clearly associated with their relative quenching efficiencies of photoluminescence; photocatalyst showing high quenching efficiency exhibited a high photocatalytic reactivity.

scholarly journals Preparation and stress-strain behavior of in-situ epoxidized natural rubber/SiO2 hybrid through a sol-gel method

2018 ◽  
Vol 12 (2) ◽  
pp. 180-185 ◽  
Author(s):  
S. M. Li ◽  
T. W. Xu ◽  
Z. X. Jia ◽  
B. C. Zhong ◽  
Y. F. Luo ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Sol Gel ◽  
Epoxidized Natural Rubber ◽  
Stress Strain ◽  
Gel Method ◽  
Sol Gel Method ◽  
Strain Behavior

Preparation of La0.75Sr0.25Cr0.5Mn0.5O3-δ Nanometer Powders by Sol-Gel Method and Research about its Electrochemical Performance

2013 ◽  
Vol 712-715 ◽  
pp. 257-261
Author(s):  
Yin Lin Wu ◽  
Qing Hui Wang ◽  
Ling Wang ◽  
Hai Yan Zhao
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Electrochemical Performance ◽  
Heat Treatment Temperature ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Preparation Process ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ft Ir

The La0.75Sr0.25Cr0.5Mn0.5O3-δnanometer powders were prepared by citric acid sol-gel method.The samples were characterized by DTA, FT-IR, XRD, TEM techniques. The preparation process, morphology of synthesized powders, the best heat-treatment temperature and the electrochemical performance had been studied. The results show that the spherical nanometer powders can be obtained and the best heat-treatment temperature is 800°C. The particle size is about 30nm and Ea is 0.071 eV.

Preparation of amphiphilic nano-sized NaA/glass films and powders using layer-by-layer in-situ sol–gel method

2015 ◽  
Vol 213 ◽  
pp. 1-7 ◽  
Author(s):  
Fei Tong ◽  
Jie Gong ◽  
Ming Li ◽  
Changfeng Zeng ◽  
Lixiong Zhang
Keyword(s):  
Sol Gel ◽  
Layer By Layer ◽  
Gel Method ◽  
Sol Gel Method ◽  
Glass Films

In Situ Synthesis of SiO2 Nanoparticles by Sol-Gel Method on Cotton Fabrics and Investigation of their Physical and Chemical Properties

2021 ◽  
Vol 891 ◽  
pp. 37-42
Author(s):  
Sheila Shahidi ◽  
Hakimeh Mohammadbagherloo ◽  
Seyedmohammad Elahi ◽  
Sanaz Dalalsharifi ◽  
Rattanaphol Mongkholrattanasit
Keyword(s):  
Flame Retardant ◽  
Water Drop ◽  
Sol Gel ◽  
Cotton Fabrics ◽  
In Situ Synthesis ◽  
Order Structure ◽  
Gel Method ◽  
Sol Gel Method ◽  
Flame Retardant Properties

In this paper, the sol-gel method was used for in-situ synthesis of SiO2 nanoparticles (NPs) on cotton fabrics with tetraethyl orthosilicate (TEOS) in the presence of acid and alkaline indicators. The samples were characterized using by (X-ray diffraction) XRD, (scanning electron Microscopy) SEM, (Inductively coupled plasma) ICP, water drop test and also the flame retardant properties were studied by char yield. The SEM images showed that the nanoparticles are spherical in shape and the acidity or alkalinity of the medium has an effect on the formation of particles. The XRD patterns showed the typical diffraction of amorphous SiO2 (Si-O short-order structure), also ICP analysis showed that by washing the fabrics, the nanoparticles are still present on the fabric, and this indicated the stability of the washing of the fabrics impregnated with the nanoparticles. By in-situ synthesis of SiO2 nanoparticles, the flame retardant properties have been improved significantly and the amount of residual char was increased and samples were observed to be hydrophilic.

UV-curable fluorine-containing hybrid coatings via thiol-ene “click” reaction and an in situ sol–gel method

2012 ◽  
Vol 70 (3) ◽  
pp. 1037-1048 ◽  
Author(s):  
Emrah Çakmakçı ◽  
Yusuf Mülazim ◽  
Memet Vezir Kahraman
Keyword(s):  
Click Reaction ◽  
Sol Gel ◽  
Hybrid Coatings ◽  
Uv Curable ◽  
Gel Method ◽  
Sol Gel Method

In situ formed silica particles in rubber vulcanizate by the sol-gel method

Polymer ◽  
1997 ◽  
Vol 38 (17) ◽  
pp. 4417-4423 ◽  
Author(s):  
Yuko Ikeda ◽  
Shinzo Kohjiya
Keyword(s):  
Sol Gel ◽  
Silica Particles ◽  
Gel Method ◽  
Sol Gel Method ◽  
Rubber Vulcanizate

Preparation of TiO2/Bamboo Charcoal Photocatalysts with Sol-Gel Method

2012 ◽  
Vol 557-559 ◽  
pp. 1457-1460 ◽  
Author(s):  
Chang Bin Xia ◽  
Chun Hua Liu ◽  
Dao Xin Wu
Keyword(s):  
Ir Spectra ◽  
Sol Gel ◽  
Bamboo Charcoal ◽  
Gel Method ◽  
Sol Gel Method ◽  
Reflective Spectrum ◽  
Ft Ir ◽  
Bamboo Carbon

TiO2/bamboo charcoal complex photocatalysts has been prepared for tetra-n-butyltitanate as titanium source, bamboo carbon (BC) as the carrier with Sol-Gel method.it Characterizations were analyzed using TGA, DSC, SEM, XRD, DRS (diffuse reflective spectrum) and FT-IR spectra.

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