Studies on CdS nanoparticles dispersed in silica matrix prepared by sol-gel technique

2003 ◽  
Vol 31 (1) ◽  
pp. 3-9 ◽  
Author(s):  
B. Bhattacharjee ◽  
S.K. Bera ◽  
D. Ganguli ◽  
S. Chaudhuri ◽  
A.K. Pal
Keyword(s):  
Sol Gel ◽  
Silica Matrix ◽  
Cds Nanoparticles ◽  
Gel Technique

Sol-Gel Elaboration and Optical Features of Eu3+-Doped CdS Nanocrystals in SiO2

2007 ◽  
Vol 555 ◽  
pp. 389-393 ◽  
Author(s):  
B. Julián ◽  
J. Planelles ◽  
E. Cordoncillo ◽  
P. Escribano ◽  
C. Sanchez ◽  
...  
Keyword(s):  
Sol Gel ◽  
Silica Matrix ◽  
Cds Nanoparticles ◽  
Rare Earth Ion ◽  
Sio2 Matrix ◽  
Chemical Homogeneity ◽  
Synthesis Conditions ◽  
Cds Nanocrystals ◽  
Back Transfer

In this work, Eu3+-doped CdS nanocrystals embedded in a SiO2 matrix were synthesised by a sol-gel method since this method confers a great chemical homogeneity, and allows in-situ generation and controlled growth of CdS nanocrystals within the silica glass. The influence of the sol-gel conditions on the Eu3+ optical response has been investigated. The synthesis conditions can be varied to modify the structure of the material, and the dispersion of the rare earth ion, within the silica matrix. From the optical analysis an energy transfer appears from CdS nanoparticles to Eu3+ ions but also a back transfer Eu3+ to CdS nanoparticles is evidenced.

Annealing behavior of silver, copper, and silver–copper nanoclusters in a silica matrix synthesized by the sol‐gel technique

1996 ◽  
Vol 80 (12) ◽  
pp. 6734-6739 ◽  
Author(s):  
G. De ◽  
M. Gusso ◽  
L. Tapfer ◽  
M. Catalano ◽  
F. Gonella ◽  
...  
Keyword(s):  
Sol Gel ◽  
Silica Matrix ◽  
Copper Nanoclusters ◽  
Annealing Behavior ◽  
Silver Copper ◽  
Gel Technique

Preparation of Maghemite-Silica Nanocomposites Using Sol-Gel Technique

2010 ◽  
Vol 97-101 ◽  
pp. 2140-2143 ◽  
Author(s):  
Bee Chin Ang ◽  
Iskandar Idris Yaacob
Keyword(s):  
Crystallite Size ◽  
Sol Gel ◽  
Weight Ratio ◽  
Spherical Shape ◽  
Average Crystallite Size ◽  
Silica Matrix ◽  
Silica Xerogel ◽  
Maghemite Nanoparticles ◽  
Silica Nanocomposites ◽  
Gel Technique

Superparamagnetic maghemite nanoparticles were successfully produced using Massart’s procedure. Nanocomposites consisting of the synthesized maghemite nanoparticles and silica were produced by dispersing the as-synthesized maghemite nanoparticles into the silica xerogel, which was prepared by sol-gel technique. The system was then heated for 3 days at 140oC. A variety of weight ratios of Fe2O3/SiO2 was investigated. The nanocomposites were characterized using TGA, XRD, TEM and AGM. TGA thermogram showed one significant weight loss at around 250oC. It was caused by dehydration and evaporation of solvent from sol-gel process. XRD showed that the dispersed particles were still maghemite. TEM micrographs showed that the maghemite nanoparticles were in spherical shape and they were homogeneously incorporated in the silica matrix. The values of magnetization at 10kOe applied field were in the range of 1.79emu/g to 9.53emu/g depending of the Fe2O3/SiO2 ratio. Reduction of average crystallite size of dispersed maghemite particles was observed after encapsulation process. Increasing weight ratio of Fe2O3/SiO2 caused increase of the average crystallite size of maghemite nanoparticles.

Preparation and Deposition of Hydroxyapatite on Biomaterials by Sol-Gel Technique-A Review

2013 ◽  
Vol 1 (2) ◽  
pp. 59-69 ◽  
Author(s):  
Sarbjit Kaur ◽  
Niraj Bala ◽  
Charu Khosla
Keyword(s):  
Sol Gel ◽  
Gel Technique

Macrocellular Titanosilicate Monoliths as Highly Efficient Structured Olefin Epoxidation Catalysts

2019 ◽  
Author(s):  
Valentin Smeets ◽  
Ludivine van den Biggelaar ◽  
Tarek Barakat ◽  
Eric M. Gaigneaux ◽  
Damien Debecker
Keyword(s):  
Sol Gel ◽  
Silica Matrix ◽  
Flow Mode ◽  
Tetrahedral Coordination ◽  
Excellent Performance ◽  
One Pot ◽  
Templating Method ◽  
Porous Texture ◽  
Internal Phase ◽  
Epoxidation Of Cyclohexene

Self-standing macrocellular titanosilicate monolith foams are obtained using a one-pot sol-gel route and show excellent performance in the epoxidation of cyclohexene. Thanks to the High Internal Phase Emulsion (HIPE) templating method, the materials feature a high void fraction, a hierarchically porous texture and good mechanical strength. Highly dispersed Ti species can be incorporated in tetrahedral coordination the silica matrix. These characteristics allow the obtained ‘SiTi(HIPE)’ materials to reach high catalytic turnover in the epoxidation of cyclohexene. The monoliths can advantageously be used to run the reaction in continuous flow mode.<br>

Sol - Gel Technique Applied for Biomaterials Achievement

2011 ◽  
Vol 4 (3) ◽  
pp. 224-237 ◽  
Author(s):  
Aurica P. Chiriac ◽  
Loredana E. Nita ◽  
Iordana Neamtu ◽  
Manuela T. Nistor
Keyword(s):  
Sol Gel ◽  
Gel Technique

scholarly journals Tailoring Mesoporous Titania Features by Ultrasound-Assisted Sol-Gel Technique: Effect of Surfactant/Titania Precursor Weight Ratio

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1263
Author(s):  
Elvira Mahu ◽  
Cristina Giorgiana Coromelci ◽  
Doina Lutic ◽  
Iuliean Vasile Asaftei ◽  
Liviu Sacarescu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Weight Ratio ◽  
Soft Template ◽  
Synthesis Process ◽  
Mesoporous Titania ◽  
Cavitation Effect ◽  
Titania Precursor ◽  
Gel Technique ◽  
Ultrasound Assisted

A mesoporous titania structure has been prepared using the ultrasound-assisted sol-gel technique in order to find out a way to tailor its structure. The TiO2 obtained was compared to the same version of titania but synthesized by a conventional sol-gel method with the objective of understanding the effect of ultrasound in the synthesis process. All synthesis experiments were focused on the preparation of a titania photocatalyst. Thus, the anatase photocatalytic active phase of titania was proven by X-ray diffraction. Additionally, the ultrasonation treatment proved to increase the crystallinity of titania samples, being one of the requirements to having good photocatalytic activity for titania. The influence of surfactant/titania precursor weight ratio on the structural (XRD), textural (N2-sorption measurements), morphological (TEM), surface chemistry (FTIR) and optical properties (UVDR) was investigated. It was observed that the crystallite size, specific surface area, band gap energy and even photocatalytic activity was affected by the synergism occurring between cavitation effect and the surfactant/titania precursor weight ratio. The study yielded interesting great results that could be considered for further application of ultrasound to tailor mesoporous titania features via sol-gel soft template synthesis, against conventional sol-gel process.

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