scholarly journals Gelatin Template Synthesis of Aluminum Oxide and/or Silicon Oxide Containing Micro/Mesopores Using the Proteic Sol-Gel Method

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Amanda Sayure Kasuya de Oliveira ◽  
Adriana Perpetua Figueiredo Paulista ◽  
Ana Ellen Valentim de Alencar ◽  
Tiago Pinheiro Braga
Keyword(s):  
Aluminum Oxide ◽  
Silicon Oxide ◽  
Amorphous Material ◽  
Sol Gel ◽  
Textural Properties ◽  
Gel Method ◽  
Sol Gel Method ◽  
Mesoporous Oxide ◽  
Stretching Vibration ◽  
Different Characteristics

Aluminum oxide and/or silicon oxide-based supports were synthesized by proteic sol-gel method. The characterization was performed through the analysis of TG, XRD, FTIR, SEM, and N2 physisorption. The XRD diffractograms showed an amorphous material profile. TG results indicate the total liberation of the organic and inorganic material in the calcination temperature used, occurring in different mass loss range. This piece of information was reaffirmed by the FTIR spectra, which presented characteristic bands of gelatin structure before calcinations which disappear in the spectrum of the solid after calcinations, indicating the loss of organic matter from gelatin after heat treatment. The spectra exhibited M-O stretching vibration at low wavenumbers after calcinations related to metal oxides. The acquired images by SEM suggest the obtaining of a highly porous material with very different characteristics depending on the composition of the support. The N2 isotherms indicate the presence of a micro/mesoporous oxide with interesting textural properties, particularly for the supports containing aluminum and silicon oxide. The ethanol dehydration results showed greater selectivity to diethyl ether compared to ethylene. From the reaction data, the following order of acid strength was obtained: 2Si-Al > Si-2Al > Si-Al > Al, which is related to the Si-Al ratio.

Structural, Textural and Thermal Characterization of Nano-Mg/Al Hydrotalcite before and after Cr (VI) Removal

2013 ◽  
Vol 755 ◽  
pp. 53-60
Author(s):  
Esthela Ramos Ramírez ◽  
Norma Leticia Gutiérrez Ortega ◽  
Cesar Augusto Contreras Soto ◽  
Gustavo Rangel Porras
Keyword(s):  
Crystalline Structure ◽  
Sol Gel ◽  
Textural Properties ◽  
Kinetic Studies ◽  
Thermal Characterization ◽  
Gel Method ◽  
Sol Gel Method ◽  
Before And After ◽  
Short Time

In this work there was studied the structural, textural and effect that has treat thermal on the removal of Cr (VI) of nanoMg/Al hydrotalcite (NHT) synthesized by the sol-gel method with a ratio of Mg/Al=3. These present the characterization of the nanoMg/Al hydrotalcite before and after Cr (VI) removal, as well as the kinetic studies and of balance. In agreement with the results, when the NHT are thermal treated to 350 °C the hydrotalcite crystalline structure remains but the textural properties are improved and structural. The NHT synthesized by the sol-gel method present a good capacity of removal with values of 91 mg of Cr (VI) removed / g of NHT. The above mentioned capacity of removal gets improved after thermal treating the material, reaching values of removal of 124 mg of Cr (VI) removed / g of NHT. The NHT with the Cr (VI) absorbed show decrease of the crystalline structure, as well as a saturation of the pores that annuls the porosity due to the fact that the Cr (VI) lodges both at the pores and at the intersheets. The time that him takes the HLM to remove the Cr (VI) of the watery solution is alone of 2 minutes, with which it is possible to conclude that the NHT have an excellent aptitude to remove Cr (VI) of watery solutions in an interval of very short time.

Template Assisted Fabrication of TiO2 and BaTiO3 Nanotubes

2012 ◽  
Vol 271-272 ◽  
pp. 107-111 ◽  
Author(s):  
Chien Chon Chen ◽  
Chin Hua Cheng ◽  
Guo Yi Tang ◽  
Tai Nan Lin ◽  
Chung Kwei Lin
Keyword(s):  
Mechanical Properties ◽  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Electronic Devices ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Anodic Aluminum ◽  
Working Electrode ◽  
Peeling Off

This paper discussed fabrication of TiO2 and BaTiO3 nanotubes by sol-gel method and used anodic aluminum oxide (AAO) as template. The mechanical properties of TiO2 or BaTiO3 NTs are not great, so a longer tube can crack easily, leading to the peeling off of the NTs film from the Ti substrate. Therefore, we propose to use AAO as a template, followed by deposition of TiO2 and BaTiO3 NT inside AAO to make a working electrode for further electronic devices.

scholarly journals Comparative study on photocatalytic activity of transition metals (Ag and Ni)-doped ZnO nanomaterials synthesized via sol–gel method

2020 ◽  
Vol 7 (2) ◽  
pp. 191590 ◽  
Author(s):  
A. K. Azfar ◽  
M. F. Kasim ◽  
I. M. Lokman ◽  
H. A. Rafaie ◽  
M. S. Mastuli
Keyword(s):  
Photocatalytic Activity ◽  
Active Sites ◽  
Sol Gel ◽  
Textural Properties ◽  
High Photocatalytic Activity ◽  
Factors Affecting ◽  
Gel Method ◽  
Sol Gel Method ◽  
Zno Nanomaterials ◽  
Almost All

Ag and Ni/ZnO photocatalyst nanostructures were successfully synthesized by a sol–gel method. In this work, the photocatalyst sample was systematically studied based on several factors affecting the performance of photocatalyst, which are size, morphology, band gap, textural properties and the number of active sites presence on the surface of the nanocatalyst. X-ray diffraction revealed that Ag/ZnO nanomaterials experienced multiple phases, meanwhile for Ni/ZnO the phase of nanomaterials were pure and single phase for stoichiometry less than 5%. Field emission scanning electron microscope (FESEM) showed almost all of the synthesized nanomaterials possessed a mixture of nanorods and spherical-like shape morphology. The Ag/ZnO showed high photocatalytic activity, producing at least 14th trials of nanocatalyst reusability on degradation of methyl orange under UV irradiation. Interestingly, this phenomenon was not observed in larger surface area of Ni/ZnO nanomaterials which supposedly favour photocatalytic activity, but instead producing poor photocatalytic performance. The main reasons were studied and exposed by temperature-programmed desorption of carbon dioxide (TPD–CO 2 ) which showed that incorporation of Ag into ZnO lattice has enhanced the number of active sites on the surface of the nanocatalyst. Whereas incorporation of Ni in ZnO has lowered the number of active sites with respect to undoped ZnO. Active sites measurement is effective and significant, providing opportunities in developing an intensive study as an additional factor.

Anodizing of Aluminum Coated with Silicon Oxide by a Sol-Gel Method

2001 ◽  
Vol 148 (11) ◽  
pp. B473 ◽  
Author(s):  
Keiji Watanabe ◽  
Masatoshi Sakairi ◽  
Hideaki Takahashi ◽  
Katsumi Takahiro ◽  
Shinji Nagata ◽  
...  
Keyword(s):  
Silicon Oxide ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method

Low friction nanocomposite aluminum oxide/MoS2 coatings prepared by sol-gel method

2018 ◽  
Vol 44 (7) ◽  
pp. 8534-8539 ◽  
Author(s):  
Bożena Pietrzyk ◽  
Sebastian Miszczak ◽  
Łukasz Kaczmarek ◽  
Marek Klich
Keyword(s):  
Aluminum Oxide ◽  
Sol Gel ◽  
Low Friction ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Preparation of Aluminum Oxide-Hybridized Hydroxyapatite Powder by the Sol-Gel Method

2005 ◽  
Vol 113 (1315) ◽  
pp. 241-244 ◽  
Author(s):  
Eiji FUJII ◽  
Koji KAWABATA ◽  
Hideyuki YOSHIMATSU ◽  
Kanji TSURU ◽  
Satoshi HAYAKAWA ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Hydroxyapatite Powder

Chelating Agent Role in Synthesizing Cerate-Zirconate Powder by a Sol-Gel Method

2014 ◽  
Vol 896 ◽  
pp. 112-115 ◽  
Author(s):  
Nafisah Osman ◽  
Nur Athirah Abdullah ◽  
Sharizal Hasan
Keyword(s):  
Glycolic Acid ◽  
Chelating Agents ◽  
Sol Gel ◽  
Chelating Agent ◽  
Carboxylic Group ◽  
Absorption Bands ◽  
Gel Method ◽  
Sol Gel Method ◽  
Powder Properties ◽  
Different Characteristics

In this study, powders of BaCe0.54Zr0.36Y0.1O2.95 (BCZY) were synthesized by a sol-gel method assisted with three different groups of chelating agents. The chelating agents used were citric acid, tartaric acid, glycolic acid from carboxylic group, tryelthylenetetraamine (TETA) from polyamino group, nitriloaacetic acid (NTA) and ethylenediaaminetetraacetic acid (EDTA) from polyamino carboxylic group. The samples were dried at 325 °C and calcined at a series of temperatures. The solution and resulting powder properties were studied using Fourier transform Infrared (FTIR) spectroscopy. FTIR spectra showed all the samples exhibit different characteristics of absorption bands after being treated at various temperatures. Such behavior indicates that the chelation process took place before the formation of metal oxide. The chelating agent from polyamino group that consists of N-donor atoms, which is TETA showed no characteristics peak of carbonates was detected after the sample was calcined at 1100 °C. Therefore, TETA gave a significant role in reducing calcination temperature for synthesizing cerate-zirconate powder.

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