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    題名: Carboxymethyl chitosan has sensitive two-way CO2-responsive hydrophilic/hydrophobic feature
    作者: Yeong-Tarng Shieh;Yu-De Chen;Trong-Ming Don
    關鍵詞: Chitosan;N, O-carboxymethyl chitosan;CO2 responsiveness;Amphiphilic properties
    日期: 2020-08
    上傳時間: 2020-10-07 12:10:12 (UTC+8)
    出版者: Elsevier
    摘要: Carboxymethyl chitosans (CMC) with various degrees of carboxymethyl substitution were prepared and investigated on their changes in water solubility in response to bubbling of CO2 or N2 as a function of the relative concentrations of COOH and NH2 side groups. When having similar concentrations of COOH and NH2, the produced CMC was water soluble at pH 10 and consecutively experienced peculiar dissolution-to-precipitation-to-dissolution during bubbling of CO2, and experienced reverse dissolution-to-precipitation-to-dissolution process during subsequently bubbling of N2. With the concentration of COOH much higher than that of NH2, the water soluble CMC at pH 10 exhibited no phase changes in response to bubbling of CO2 and N2. This newly developed CMC solution system with novel CO2 responsive amphiphilic feature has a potential use as a CO2 switchable surfactant to control interface of mixtures of hydrophilic and hydrophobic species in emulsification/demulsification applications.
    關聯: Carbohydrate Polymers 241, 116408
    DOI: 10.1016/j.carbpol.2020.116408
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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