All-Aqueous Liquid Crystal Nanocellulose Emulsions with Permeable Interfacial Assembly.

Bai, Long; Huan, Siqi; Zhao, Bin; Zhu, Ya; Esquena, Jordi; Chen, Feng; Gao, Guang; Zussman, Eyal; Chu, Guang; Rojas, Orlando J

Bai, Long; Huan, Siqi; Zhao, Bin; Zhu, Ya; Esquena, Jordi; Chen, Feng; Gao, Guang; Zussman, Eyal; Chu, Guang; Rojas, Orlando J.

Afiliação

Bai L; Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, College of Material Science and Engineering, Northeast Forestry University, Hexing Road 26, Harbin, Heilongjiang 150040, P.R. China.
Huan S; Bioproducts Institute, Departments of Chemical & Biological Engineering, Chemistry, and Wood Science, The University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada.
Zhao B; Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, College of Material Science and Engineering, Northeast Forestry University, Hexing Road 26, Harbin, Heilongjiang 150040, P.R. China.
Zhu Y; Bioproducts Institute, Departments of Chemical & Biological Engineering, Chemistry, and Wood Science, The University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada.
Esquena J; Bio-based Colloids and Materials, Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O. Box 16300, FI-00076 Aalto, Espoo, Finland.
Chen F; Bio-based Colloids and Materials, Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O. Box 16300, FI-00076 Aalto, Espoo, Finland.
Gao G; Institute of Advanced Chemistry of Catalonia, Spanish National Research Council (IQAC-CSIC) and Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona 08034, Spain.
Zussman E; Bio-based Colloids and Materials, Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O. Box 16300, FI-00076 Aalto, Espoo, Finland.
Chu G; Department of Cellular and Physiological Sciences, Life Science Institute, The University of British Columbia, Vancouver, BC V6T 1Z3, Canada.
Rojas OJ; NanoEngineering Group, Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.

ACS Nano ; 14(10): 13380-13390, 2020 10 27.

Article em En | MEDLINE | ID: mdl-32946222

ABSTRACT

ABSTRACT

We report on the formation of water-in-water liquid crystal emulsions with permeable colloidal assemblies. Rodlike cellulose nanocrystals (CNC) spontaneously self-assemble into a helical arrangement with the coexistence of nonionic, hydrophilic polyethylene glycol (PEG) and dextran, whereas the two polymer solutions are thermodynamically incompatible. Stable water-in-water emulsions are easily prepared by mixing the respective CNC/polymer solutions, showing micrometric CNC/PEG dispersed droplets and a continuous CNC/dextran phase. With time, the resulting emulsion demixes into an upper, droplet-lean isotropic phase and a bottom, droplet-rich cholesteric phase. Owing to the osmotic pressure gradient between PEG and dextran phases, target transfer of cellulose nanoparticles occurs across the water/water interface to reassemble into a liquid crystal-in-liquid crystal emulsion with global cholesteric organization. The observed structural, optical, and temporal evolution confirm that the colloidal particles in the two immiscible phases experience short-range interactions and form long-range assemblies across the interface.

Palavras-chave

cellulose nanocrystals; liquid crystal; osmotic pressure; permeable self-assembly; water-in-water emulsion

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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: ACS Nano Ano de publicação: 2020 Tipo de documento: Article