日用化学工业2016，Vol.46Issue(4)：219-225,242,8.DOI:10.13218/j.cnki.csdc.2016.04.009
海藻酸辛酰胺的制备及其协同氨基SiO2纳米粒稳定液体石蜡／水乳液的研究
Preparation of alginate caprylamide and its function for stabilizing liquid paraffin/water emulsions in cooperation with amino-silica nanoparticles
摘要
Abstract
Amphiphilic alginate caprylamide (ACA)was prepared via the amidation using the octylamine as a hydrophobic modifier. Then,O/W Pickering emulsions were prepared by mixing ACA with SiO2 - NH2 nanoparticles formed by modified Stber method under the action of ultrasonic wave. The structure and performance of ACA were characterized by FT - IR,1 H NMR and fluorescence spectrum. The colloidal performance of ACA,SiO2 -NH2 and their synergistic water dispersion system,as well as the morphology of the corresponding Pickering emulsions were investigated by the means of laser particle size and Zeta potential analyzer,contact angle meter and optical microscope. Experimental results showed that ACA with the degree of substitution of 0.29 ,exhibits good amphiphilic properties with the critical aggregation concentration (cac )of 0.42 g/L in 0.15 mol/L aqueous NaCl solution. ACA is successfully adsorbed on the surface of SiO2 -NH2 nanoparticles via electrostatic force,causing the hydrodynamic size of SiO2 -NH2 increases from 155 nm to 386 nm,and the Zeta potential of SiO2 -NH2 changes from +22.2 mV to -30.7 mV,which can exhibit good stabilizing performance in aqueous solution. ACA absorbed on the surface of SiO2 -NH2 nanoparticles can inhibit the aggregation and settlement of inorganic nanoparticles while the hydrophobic cavity of the micelle structure formed by free ACA can solubilize the oil droplets,reduce the coalescence of small oil droplets. The co-existence of larger Pickering emulsion droplets and smaller traditional emulsion droplets appear in the optical microscope images. When the mass concentration of ACA is in the range of 0.5 cac-1.0 cac,the co-existence of the two kinds of emulsions is the most obvious phenomenon.关键词
海藻酸辛酰胺/Pickering乳液/临界聚集浓度/稳定性Key words
alginate caprylamide/Pickering emulsion/critical aggregation concentration/stability分类
化学化工引用本文复制引用
陈秀琼,颜慧琼,冯玉红,史载锋,王向辉,林强..海藻酸辛酰胺的制备及其协同氨基SiO2纳米粒稳定液体石蜡／水乳液的研究[J].日用化学工业,2016,46(4):219-225,242,8.基金项目
国家自然科学基金资助项目（21366010，21566009）；海南省重点科技计划资助项目 （）
