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Acetalization of Carbonyl Compounds by Using Silica-bound Sulfuric Acid under Green Condition
Mirjalili, Bi Bi Fatemeh,Zolfigol, Mohammad Ali,Bamoniri, Abdolhamid,Hazar, Azizeh Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.6
Aldehydes and ketones were converted to their corresponding acetals in the presence of silica-bound sulfuric acid in n-hexane under mild and heterogeneous conditions with excellent yields.
Optimization of nano TiO2 pretreatment on free acid dyeing of wool using central composite design
ALI NAZARI,Mohammad Mirjalili,Navid Nasirizadeh,Shahab Torabian 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The aim of the research is to investigate nano technique of wool acid dyeing without the presence of acidauxiliary agent at temperatures lower than the boiling. The wool fabrics are first pretreated with nanoTiO2 and BTCA at different concentrations. The dyeing process is then carried out on the pretreatedfabrics with C. I. Acid Blue 113 and C. I. Acid Black 3 dyes. Also, the central composite design analysis isapplied to design the relation between nano TiO2 and BTCA concentrations, and dye exhaustion. Theresponse surface methodology is also applied to find the optimum conditions for the wool fabricpretreatment. The scanning electron microscopy and X-ray diffraction are employed to indicate thepresence, crystal type and size of TiO2 nanoparticles on the wool surface. The pretreatment optimizationon the wool surfaces considerably enhances the absorption of acid dyes. The suggested methoddemonstrates the improvement of fastness properties than control dyeing and could be introduced as anew route, disclosing various desirablemulti-functional characteristics, to wool fabric. This technique isalso free from some of the disadvantages of acid chemical involved in dyeing such as damage to woolfabrics than wool conventional dyeing.
Samane Parsian,Mohammad Mirjalili,Sheila Shahidi,Mahmood Ghoranneviss 한국섬유공학회 2018 Fibers and polymers Vol.19 No.4
The main aim of this research work is in situ synthesis of carbon nano tube (CNT) on nonwoven glass mat. Different types of catalyst were used and the effect of them on growth of carbon nanotubes on glass mat was investigated. The process was considered as variable catalysts to achieve optimal conditions for CNT deposition on glass mat. In this research, iron, cobalt, copper and nickel were used as catalysts and acetylene gas was used as the hydrocarbon source. Also, argon was used as a carrier gas. In first step, samples were coated by mentioned catalyst using plasma sputtering method. The thickness of the catalyst on the surface of samples was fixed at 100 nm. In second part, thermal chemical vapor deposition (TCVD) system was used for growth of carbon nano tubes. Scanning electron microscopy (SEM) and raman spectroscopy, thermogravimetric analysis (TGA-DTG) and transmission electron microscopy (TEM) were used for investigating the morphology and quality of produced CNT. Electrical conductivity was observed and compared on both untreated and coated glass mat. The results show that, by pre sputtering of samples with nickel, the quality of CNT on the surface of glass mat will be improved and the resistivity of samples reach to 610 Ω.
BiBi Fathemeh, Mirjalili,Mohammad Ali, Zolfigol,Abdolhamid, Bamoniri Korean Chemical Society 2001 대한화학회지 Vol.45 No.6
클로로술폰산을 실리카겔과 반응시키면 실리카겔 표면에 황산이 공유결합으로 고정된 실리카황산을 얻게 된다. 무용매 조건하에서 마이크로웨이브를 쪼여주면서 실리카 황산과 젖은 $SiO_2$를 함께 사용하게 되면 아세탈을 화합물로 변화시키는 효과적인 탈아세탈 시약으로 사용할 수 있다. Neat chlorosulfonic acid reacts with silica gel to give silica sulfuric acid in which sulfuric acid is immobilized on the surface of silica gel via covalent bond. A combination of silica sulfuric acid and wet SiO$_2$ was used as an effective deacetalizating agent for the conversion of acetals to their corresponding carbonyl derivatives by using microwave irradiation under solvent free conditions.