Development of Highly Dispersed Hybrid Nanoalumina with the Sol-Gel Method

2014 ◽  
Vol 87 ◽  
pp. 48-53 ◽  
Author(s):  
Foteini Petrakli ◽  
Dimitris Sioulas ◽  
Athena Tsetsekou
Keyword(s):  
Electron Microscopy ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Alumina Powder ◽  
Complexation Reaction ◽  
Ethylene Imine ◽  
Gel Method ◽  
Sol Gel Method ◽  
Highly Dispersed

A hybrid sol-gel method was employed to develop a uniform and highly dispersed alumina nanopowder in the presence of hyperbranched dendritic poly(ethylene)imine (PEI) acting as template material and complexation agent for aluminium ions. For this purpose, the hydrolysis and polycondensation reactions followed the complexation reaction between the Al(NO3)3precursor and PEI, whereas ammonium polymethacrylate was added to improve the powder dispersion. The as-formed nanopowder was characterized before and after calcination studies carried out in the temperature range 100-1200 °C. For this purpose Scanning Electron Microscopy (SEM), Field Emission SEM, Transmission Electron Microscopy (TEM), X Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric and Differential Thermal Analysis (TG-DTA), N2porosimetry and ζ-potential measurements at different pH were carried out. The analysis confirmed the successful formation of a boehmite-PEI hybrid material of uniform tiny spheroid crystals (~ 1-2 nm) and small agglomerates. The boehmite phase is kept up to 300 °C, whereas after calcination at 600 °C a stabilized γ-alumina powder of high surface area and crystal sizes around 2-5 nm results. This phase is quite stable being kept even after calcination at 1000 °C. The transformation to the stable α-alumina phase is completed at 1100 °C leading to an easily dispersed nanopowder with crystal sizes ranging between 5-25 nm.

Synthesis and structural characteristics of high surface area TiO2 aerogels by ultrasonic-assisted sol–gel method

2018 ◽  
Vol 29 (7) ◽  
pp. 075702 ◽  
Author(s):  
Feng Qingge ◽  
Cai Huidong ◽  
Lin Haiying ◽  
Qin Siying ◽  
Liu Zheng ◽  
...  
Keyword(s):  
Surface Area ◽  
Structural Characteristics ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ultrasonic Assisted

High surface area nickel aluminate spinels prepared by a sol–gel method

2001 ◽  
Vol 180 (3) ◽  
pp. 253-258 ◽  
Author(s):  
C. Otero Areán ◽  
M. Peñarroya Mentruit ◽  
A.J. López López ◽  
J.B. Parra
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Nickel Aluminate ◽  
Gel Method ◽  
Sol Gel Method

Synthesis and Characterization of CaO-SiO2-MgO Bioactive Glass Produced by Sol-Gel

2016 ◽  
Vol 720 ◽  
pp. 252-256
Author(s):  
Nadia Mohammed Elmassalami Ayad ◽  
Andre Ben Hur da Silva Figueiredo ◽  
Wilma de Araujo Gonzalez ◽  
Daniel Navarro da Rocha ◽  
Rubens Lincoln Santana Blazutti Marçal ◽  
...  
Keyword(s):  
Fumed Silica ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Gel Method ◽  
Sol Gel Method ◽  
Before And After ◽  
Ft Ir ◽  
Silica Precursor ◽  
Gelling Time

Bioactive glasses have widely used in biomedical applications such as bone filler due to their excellent biocompatibility, bioactivity and osteoconduction characteristics. In this work, a silicate-rich glass was synthesized by the sol-gel method with 60% SiO2 – 30%CaO – 10% MgO composition where fumed silica acts as the silica precursor. This new method was hypothesized to reduce the gel formation time, due to the high surface area of the fumed silica. In addition, this would presumably increase the nanoporosity of the glass. For comparison purposes, we used a glass of the same composition, but with the conventional silica precursor, tetraethyl orthosilicate (TEOS), through the sol gel method. Both were heat treated at 450°C. FT-IR analysis before and after heat treatment at 450°C showed the presence of nitrate groups, especially in the TEOS samples. This is consistent with the more hygroscopic aspect of those samples. The fumed silica samples had significantly less pronounced peaks corresponding to the nitrate groups, consistent with the more porous structure and the less hygroscopic aspect. The fumed silica samples indeed had a lower gelling time and showed similar results obtained by XRD and FT-IR analyses, showing that the use of fumed silica is viable and advantageous in the glass synthesis by the sol-gel process

Synthesis of high surface area supported Pt/SiO2 catalysts from H2PtCl6·6H2O by the sol-gel method

1992 ◽  
Vol 15 (3-4) ◽  
pp. 547-554 ◽  
Author(s):  
M. Azomoza ◽  
T. Lopez ◽  
R. Gomez ◽  
R.D. Gonzalez
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Gel Method ◽  
Sol Gel Method

Synthesis of High Surface Area Phosphosilicate Glasses by a Modified Sol−Gel Method

2005 ◽  
Vol 17 (8) ◽  
pp. 2081-2090 ◽  
Author(s):  
Antonio Aronne ◽  
Maria Turco ◽  
Giovanni Bagnasco ◽  
Pasquale Pernice ◽  
Martino Di Serio ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Nanostructured Mesoporous Titanium Dioxide Thin Film Prepared by Sol-Gel Method for Dye-Sensitized Solar Cell

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Yu-Chang Liu ◽  
Yun-Fang Lu ◽  
Yz-Zhen Zeng ◽  
Chi-Hung Liao ◽  
Jen-Chieh Chung ◽  
...  
Keyword(s):  
Thin Film ◽  
Titanium Dioxide ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Energy Conversion Efficiency ◽  
Diameter Distribution ◽  
Gel Method ◽  
Sol Gel Method ◽  
Preparation Conditions

Titanium dioxide (TiO2) paste was prepared by sol-gel and hydrothermal method with various precursors. Nanostructured mesoporous TiO2thin-film back electrode was fabricated from the nanoparticle colloidal paste, and its performance was compared with that made of commercial P25 TiO2. The best performance was demonstrated by the DSSC having a 16 μm-thick TTIP-TiO2back electrode, which gave a solar energy conversion efficiency of 6.03%. The ability of stong adhesion on ITO conducting glass substrate and the high surface area are considered important characteristics of TiO2thin film. The results show that a thin film with good adhesion can be made from the prepared colloidal paste as a result of alleviating the possibility of electron transfer loss. One can control the colloidal particle size from sol-gel method. Therefore, by optimizing the preparation conditions, TiO2paste with nanoparticle and narrow diameter distribution was obtained.

Sol–gel method for preparing high surface area CoAl2O4 and Al2O3–CoAl2O4 spinels

1999 ◽  
Vol 39 (1) ◽  
pp. 22-27 ◽  
Author(s):  
C. Otero Areán ◽  
M. Peñarroya Mentruit ◽  
E. Escalona Platero ◽  
F.X. Llabrés i Xamena ◽  
J.B. Parra
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Gel Method ◽  
Sol Gel Method
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