Preparation of hybrid composites based on epoxy, novolac, and epoxidized novolac resins and silica nanoparticles with high char residue by sol-gel method

2017 ◽  
Vol 39 (S4) ◽  
pp. E2316-E2323 ◽  
Author(s):  
Amin Abdollahi ◽  
Hossein Roghani-Mamaqani ◽  
Mehdi Salami-Kalajahi ◽  
Bahareh Razavi ◽  
Alireza Mousavi ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Hybrid Composites ◽  
Sol Gel ◽  
Char Residue ◽  
Gel Method ◽  
Sol Gel Method ◽  
Novolac Resins

Silica Nanoparticles Synthesized from Maize Cob using Modified Sol-Gel Method

2020 ◽  
Vol 15 (2) ◽  
pp. 22-29
Author(s):  
Jeleel Adekunle Adebisi ◽  
Johnson Olumuyiwa Agunsoye ◽  
Sefiu Adekunle Bello ◽  
M. Haris ◽  
M. Senthilkumar ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Silica Nanoparticles ◽  
Amorphous Silica ◽  
Sol Gel ◽  
Agricultural Wastes ◽  
Gel Method ◽  
Sol Gel Method ◽  
Maize Cob ◽  
Pre Treatment ◽  
Maize Cobs

Silica has found applications in many industries. Its production from agricultural wastes has been reported but with marked agglomeration of the final product. This work investigated production of silica nanoparticles from maize cob and effect of sol-gel modification with ethylene glycol on degree of agglomeration was also examined. This work also explored the effects of acid pre/post calcination treatments of the maize cob. Maize cob was treated with HCl prior to and after calcination. Using sol-gel method, silica was produced from both untreated and treated maize cobs. Ethylene glycol was also added to sodium silicate prior to precipitation of silica gel for modification of the conventional sol-gel procedure. The results showed that acid treatments affect the purity of silica nanoparticles. Ethylene glycol was observed to reduce degree of agglomeration in silica nanoparticles production from agricultural wastes. Silica nanoparticles of sizes between 5 and 50 nm were successfully synthesized. Keywords: Agricultural Wastes, Maize cob, Amorphous silica, Agglomeration, Sol-gel, Acid pre-treatment.

Study on Photo-Degradation of Poly(ethylene terephthalate)/SiO2/TiO2 Hybrid Composites by Sol-Gel Method under Ultraviolet Radiation

2013 ◽  
Vol 721 ◽  
pp. 144-147
Author(s):  
Jiang Zhu ◽  
Xiang Liu ◽  
Qiang Xu ◽  
Qin Ren
Keyword(s):  
Ultraviolet Radiation ◽  
Ethylene Terephthalate ◽  
Hybrid Composites ◽  
Sol Gel ◽  
Photo Degradation ◽  
Gel Method ◽  
Sol Gel Method ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Degradation Properties

Poly (ethylene terephthalate) (PET)/SiO2/TiO2 hybrid composites were synthesized via the sol-gel method in the presence of tetraethylorthosilicate (TEOS) and tetrabutyltitanate (TBT). The formation of Si-O-Ti bonds in the resulting products was confirmed by Fourier transform infrared spectroscopy (FTIR) analysis. The Photo-degradation properties of hybrid composites were investigated under the ultraviolet radiation. And the change of the intrinsic viscosity for the hybrid composites was measured using an Ubbelohde viscometer after the photo-degradation.

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