Surface modification of silica-graphene nanohybrid as a novel stabilizer for oil-water emulsion

• Published in: The Korean journal of chemical engineering Vol. 34; no. 9; pp. 2488 - 2497
• Main Authors: Tajik, Sanaz, Nasernejad, Bahram, Rashidi, Alimorad
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.09.2017; Springer Nature B.V; 한국화학공학회
• Subjects: Acetylene; Aerogels; Atmospheric pressure; Biotechnology; Catalysis; Catalysts; Chemical vapor deposition; Chemistry; Chemistry and Materials Science; Decalin; Electronic; Fourier transforms; Functional groups; Graphene; Industrial Chemistry/Chemical Engineering; Infrared spectroscopy; Inorganic; Materials (Organic; Materials Science; Raman spectroscopy; Silicon dioxide; Sulfuric acid; Thin Films; X ray photoelectron spectroscopy; Zeta potential; 화학공학; Silica-graphene; Chemical Vapor Deposition; Nanostructures; Functional Groups; Stabilizer
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-017-0125-y

The surface modification of silica-graphene nanohybrid through treatment with a mixture of nitric and sulfuric acid vapors to prepare a novel stabilizer for decalin-water emulsion was investigated. The nanohybrid was prepared through chemical vapor deposition using silica aerogel and acetylene as catalyst and carbon precursor at atmospheric pressure and 600 °C. The physicochemical properties of the modified nanohybrid were characterized by FT-IR, XPS, Raman spectroscopy, and TEM. The surface modification of nanohybrid was at various duration times (24, 48, and 72 hours) to optimize the surface modification conditions. Zeta potential of −39.9 mV revealed that the surface modification of nanohybrid after 72 hours had an excellent stability in aqueous phase due to the presence of exceptional functional groups. The emulsion average droplet size decreased by increasing the nanohybrid concentration. The negative value of the zeta potential showed the proposed nanohybrid can be applied as an appropriate stabilizer for emulsion.