文献类型：期刊文献

英文题名：Cellulose nanocrystals as water-in-oil Pickering emulsifiers via intercalative modification

作者：Guo, Juan[1,2] Du, Wenbo[3] Gao, Yong[3] Cao, Yuan[4] Yin, Yafang[1,2]

第一作者：郭娟

通信作者：Yin, YF[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry New Technol, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, Dept Wood Anat & Utilizat, Beijing 100091, Peoples R China;[3]Xiangtan Univ, Coll Chem, Xiangtan 411105, Peoples R China;[4]Chinese Acad Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China

年份：2017

卷号：529

起止页码：634-642

外文期刊名：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

收录：;EI(收录号：20172603860675);Scopus(收录号：2-s2.0-85021291271);WOS:【SCI-EXPANDED(收录号:WOS:000407841800075)】；

基金：This work was supported financially by a project of Research Institute for Forestry New Technology, Chinese Academy of Forestry (No. CAFINT2014K03), the National Nonprofit Institute Research Grant of CAFINT, China. Dr. Xiaoqing Wang and Miss. Kunkun Tu from Research Institute of Wood Industry, Chinese Academy of Forestry, China are acknowledged for water contact angle measurements.

语种：英文

外文关键词：Cellulose nanocrystals; Intercalative modification; Pickering emulsion; Degree of substitution; Hydroxyl group

摘要：A novel water-in-soybean oil Pickering emulsifier based on CNCs was fabricated via the intercalative chemical reaction between n-octadecyl isocyanates and hydroxyl groups in CNCs. The structural variations of alkyl intercalated CNCs with different degrees of substitution for hydroxyl groups were studied by TEM, AFM, FTIR, XRD, elemental analysis and liquid DSC. It is shown that O(2) H/O(6)H instead of O(3)H in CNCs were substituted after intercalative modification. And the particle thickness was increased after the intercalation, due to the enlargement of the basal spacing of (200) lattice plane in CNCs. While their cross section dimensions were unvaried. The structural variations in alkyl intercalated CNCs on their emulsifying capacity were further studied. Particle length has the insignificant influence on the emulsifying capacity. Alkyl intercalated CNCs with different particle lengths failed to stabilize water-in-soybean oil Pickering emulsion droplets, if O(2)H/O(6)H hydroxyl groups were fully substituted with alkyls. Alkyl intercalated CNCs with appropriate amounts of substituted hydroxyl groups possessed a good emulsifying capacity. After the initial coalescence, the average droplet size and its distribution polydispersity remained nearly constant with one year of storage. Results shown that alkyl intercalated CNCs with different degrees of substitution for hydroxyl groups had the similar interfacial tension at the soybean oil-water interface, the similar molecular arrangement of internal intercalated alkyls but different contact angles. These indicated that emulsifying capacity was mainly related to their surface alkyl chains. Besides, water-in-soybean oil Pickering emulsions stabilized by alkyl intercalated CNCs were from steric hindrance rather than interfacial tension reduction mechanism.