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

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.

Download Full-text

Al2O3 + Graphene Low-Friction Composite Coatings Prepared By Sol–Gel Method

Coatings ◽

10.3390/coatings10090858 ◽

2020 ◽

Vol 10 (9) ◽

pp. 858

Author(s):

Bożena Pietrzyk ◽

Sebastian Miszczak ◽

Ye Sun ◽

Marcin Szymański

Keyword(s):

Tribological Properties ◽

Composite Coatings ◽

Sol Gel ◽

Ceramic Coatings ◽

Treatment Temperature ◽

Graphene Nanoplatelets ◽

Low Friction ◽

Gel Method ◽

Sol Gel Method ◽

Graphene Composite

In this work, Al2O3 + graphene coatings were prepared using the sol–gel method. The aim of the study was preliminary determination of the influence of size and amount of graphene nanoplatelets on morphology, chemical structure, and basic tribological properties of Al2O3 + graphene composite coatings. Two types of reduced graphene oxide (rGO) nanoplatelets with different lateral size and thickness were used to prepare the coatings. To characterize them, scanning electron microscope (SEM), glow discharged optical emission spectrometer (GDOES), Fourier-transform infrared (FTIR), reflectance spectrometer, and ball-on-disk tribological tests were used. It was found that the presence of graphene in the Al2O3 + graphene coatings did not fundamentally change the chemical transformation of ceramic Al2O3 matrix. Morphology examinations of coatings containing larger graphene nanoplatelets revealed a tendency to their parallel arrangement in relation to the coated surface. The tribological properties of Al2O3 + graphene coatings turned out to be strongly dependent on the size of graphene nanoplatelets as well as on the heat treatment temperature. The friction coefficient as low as 0.11 and good durability were obtained for the Al2O3 + graphene coating with larger nanoplatelets and heat-treated at 500 °C. The results of conducted research indicate the potential use of Al2O3 + graphene composite coatings prepared by the sol–gel method as low-friction ceramic coatings.

Download Full-text

High-performance solution processed oxide TFT with aluminum oxide gate dielectric fabricated by a sol–gel method

Journal of Materials Chemistry ◽

10.1039/c1jm12227d ◽

2011 ◽

Vol 21 (29) ◽

pp. 10649 ◽

Cited By ~ 170

Author(s):

Christophe Avis ◽

Jin Jang

Keyword(s):

Aluminum Oxide ◽

High Performance ◽

Gate Dielectric ◽

Sol Gel ◽

Solution Processed ◽

Oxide Tft ◽

Gel Method ◽

Sol Gel Method

Download Full-text

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

Journal of Nanomaterials ◽

10.1155/2017/2504796 ◽

2017 ◽

Vol 2017 ◽

pp. 1-11 ◽

Cited By ~ 2

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.

Download Full-text