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    Study of adsorption behaviors on a SiO2 surface using alkyl cationic modified starches

    Year: 2014

    Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects Volume 441, 20 January 2014, Pages 449–458, 20140104

    Authors: Dong-Sung Han 1 2, Yu-Mi Kim 1, Han-Young Kim 1, In-Shik Cho 1, Jong-Duk Kim 2

    Last authors: Jong-Duk Kim

    Organizations: 1 Central Research Laboratories, Aekyung Co., Ltd., Daejeon 305-345, Republic of Korea 2 Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea

    Country: Korea

    Quartz crystal microbalance with dissipation monitoring (QCM-D) was performed in order to study the adsorption behavior of monoelectrolytes (cationic surfactants: C12–16 trimethyl ammonium bromide) and polyelectrolytes (cationic starches and cationic alkyl substituted starches). An adsorption step using surfactant or polymer solutions and a desorption step of rinsing with distilled water were adopted in order to observe the adsorption behavior. The adsorbed amount of all cationic starches increased compared with that of the cationic surfactants, and the adsorption gap between the adsorption and desorption processes was remarkably small. In addition, a tendency for increased rigidity after desorption was observed. In particular, the cationic alkyl (C12–18) substituted starches had long alkyl chains as well as polymer backbones. In the results, the adsorbed layer of the cationic alkyl substituted starches increased more than the general cationic starches and exhibited more rigid properties. These results were attributed to the hydrophobic interactions among polymers originating from long alkyl chain substitutions.