CO2-switchable dispersion of a natural chitosan and its application as a responsive pickering emulsifier

Ren, Dongyin1; Xu, Shengming2; Sun, Dejun3; Wang, Qibao1; Xu, Zhenghe2,4

2018-10-20

10.1016/j.colsurfa.2018.06.068

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   影响因子和分区

0927-7757

1873-4359

The natural chitosan aggregates obtained by increasing the pH of aqueous solutions are found to be responsive to CO2/N-2 switching. These chitosan aggregates can be dispersed in water upon CO2 bubbling and precipitated out with N-2 bubbling at room temperature. Liquid paraffin-in-water Pickering emulsions are prepared using these aggregates as the stabilizer. These emulsions can be demulsified completely with CO2 bubbling, and the separated two phases can be re-emulsified with N-2 bubbling under mechanical mixing. This CO2/N-2-switched demulsification/re-emulsification cycle can be repeated several times. The CO2/N-2-switched dispersion/aggregation of the chitosan aggregates leads to desorption/adsorption of the aggregates at the oil/water interface and hence the disappearance/reconstruction of the three-dimensional network structure of the aggregates, which is responsible for the demulsification/re-emulsification. Experimental evidence including the measurement of interfacial tension, interfacial dilatational elastic modulus and rheological properties, and micrographs of formed emulsions is given to support the proposed stabilization mechanism.

Chitosan CO2-switchable aggregation Emulsification Demulsification Pickering emulsion

SCI ; EI

英语

通讯

Zhujiang Talent Program of Guangdong Province[K17253301]

Chemistry

Chemistry, Physical

WOS:000443153100058

ELSEVIER SCIENCE BV

20183005603553

Aggregates ; Bubble formation ; Chitosan ; Demulsification ; Dispersions ; Emulsification ; Solutions

Highway Engineering:406 ; Gas Dynamics:631.1.2 ; Chemical Operations:802.3 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2 ; Materials Science:951

CHEMISTRY

Web of Science

1.China Univ Min & Technol, Sch Chem & Environm Engn, Beijing 100083, Peoples R China
2.Tsinghua Univ, Inst Nucl & New Energy Technol, Beijing 100084, Peoples R China
3.Shandong Univ, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Shandong, Peoples R China
4.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Ren, Dongyin,Xu, Shengming,Sun, Dejun,et al. CO2-switchable dispersion of a natural chitosan and its application as a responsive pickering emulsifier[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2018,555:507-514.

Ren, Dongyin,Xu, Shengming,Sun, Dejun,Wang, Qibao,&Xu, Zhenghe.(2018).CO2-switchable dispersion of a natural chitosan and its application as a responsive pickering emulsifier.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,555,507-514.

Ren, Dongyin,et al."CO2-switchable dispersion of a natural chitosan and its application as a responsive pickering emulsifier".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 555(2018):507-514.