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Osmotic-Pressure-Induced Nematic Ordering in Suspensions of Laponite and Carboxy Methyl Cellulose.
Xu, Peicheng; Yazici, Ahmet F; Erdem, Talha; Lekkerkerker, Henk N W; Mutlugun, Evren; Eiser, Erika.
Afiliação
  • Xu P; University of Cambridge, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
  • Yazici AF; Abdullah Gül University, Department of Materials Science and Nanotechnology Engineering, Erkilet Bul., Kayseri 38080, Turkey.
  • Erdem T; Abdullah Gül University, Department of Electrical-Electronics Engineering, Erkilet Bul., Kayseri 38080, Turkey.
  • Lekkerkerker HNW; Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterials Science, Padualaan 8, 3584 CH Utrecht, The Netherlands.
  • Mutlugun E; Abdullah Gül University, Department of Electrical-Electronics Engineering, Erkilet Bul., Kayseri 38080, Turkey.
  • Eiser E; University of Cambridge, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
J Phys Chem B ; 124(42): 9475-9481, 2020 10 22.
Article em En | MEDLINE | ID: mdl-33043670
Laponite is a synthetic clay that is known to form gels in aqueous suspensions at low concentrations (0.01 g/cm3). Although it is expected to form lyotropic liquid crystals, such phases usually do not form, as a consequence of laponite's tendency to form gels at concentrations below the threshold for liquid crystal formation. Here we show that macroscopic, birefringent phases of laponite can be prepared through osmotic compression of a laponite solution by an aqueous solution of carboxy methyl cellulose (CMC). We present polarization imaging studies showing how the initially dilute, isotropic laponite phase shrinks while developing typical birefringence colors between crossed polarizers. Using the Michel-Lévy interference charts, we were able to extract the refractive index and orientation of the laponite nanodisks in the compressed region. Our observations allow us to propose a tentative state diagram, indicating the concentration regions for which we obtain optically anisotropic gels.

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

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