Abstract
The alumina nanoparticles (NPs) have been synthesized from reaction between alum with ammonia and then calcined the precipitate at 1200 °C for 4 h. Its surface was modified by oleic acid (OA) and trimethoxyvinylsilane (TMVS) in o-xylene at 50 °C. The alumina NPs and its modified were characterized by XRD, FT-IR, SEM, EDX and TGA. The TGA analysis indicated that the grafting amount of OA and TMVS were 10.5 and 8.0% respectively. The dispersion of modified NPs was determined in monomers such as methyl methacrylate (MMA), butyl acrylate (BuA) and styrene (St) and in solvents such as ethanol, hexane and acetone. The experimental results showed that the highest dispersion was happened NPs modified by oleic acid in n-hexane, while the highest dispersion was observed NPs modified by TMVS in acetone. The results indicate that NPs modified by oleic acid formed a stable dispersion in MMA and BuA. The highest amount of dispersion happened NPs modified by oleic acid in MMA and BuA in initial weight of 5 and 2.5% respectively, while stable dispersion is formed in styrene when TMVS is used as modifier. The highest amount of dispersion was happened NPs modified by TMVS in styrene in initial weight of 2.5%.
Highlights
In recent decades, the superfine particles in the nano-scale were of great interest due to their high surface area.[1,2] Nano-sized ceramic powders, because of their excellent properties such as structural, optical and electrical behavior are effective in many fields.[3,4,5]Alumina is an important component of ceramic oxides
The surface of alumina NPs was modified by two modifiers such as oleic acid (OA), trimethoxyvinylsilane (TMVS), as well as a mixture of two modified in three ratio (3:1), (1:1) and (1:3)
As it can be seen in the above table, the results indicate that the majority of modified Al2O3 NPs by oleic acid (OA) precipitate in styrene; While OA-Al2O3 NPs formed a stable dispersion in methyl methacrylate (MMA) and butyl acrylate (BuA) monomers
Summary
The superfine particles in the nano-scale were of great interest due to their high surface area.[1,2] Nano-sized ceramic powders, because of their excellent properties such as structural, optical and electrical behavior are effective in many fields.[3,4,5]Alumina is an important component of ceramic oxides. The superfine particles in the nano-scale were of great interest due to their high surface area.[1,2] Nano-sized ceramic powders, because of their excellent properties such as structural, optical and electrical behavior are effective in many fields.[3,4,5]. Alumina is used in the chemical industry, metallurgy, pharmaceutical and food industries due to the cheapness and having good mechanical and optical properties.[6,7] Al2O3 has been widely used as catalyst and catalyst support, and it has extensive applications in ceramic industry and structural composites.[8]. That’s why they do not disperse in organic environments This feature prevents their use in the industry. This limitation can be overcome by modifying their surface by appropriate modifiers
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