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Special event - P3S Webinar: Thu, 10.12.2020

3 pm

Dr. Yang Yao
Laboratory of Food and Soft Materials, ETH Zürich
Crystallization and dynamics of polymer and water under nano-sized confinement

Prof. Dr. Ernst Rössler    
Experimental Physics, Universität Bayreuth
Polymer dynamics as revealed by field-cycling NMR

Tue, 15.12.2020 (Webinar)

5:15 pm

Anatoli Serghei

University Claude Bernard Lyon, France

Crystallization of nano-confined materials down to the scale of  attograms and zeptograms: the impact of flow and high electric fields

The crystallization of nano-confined polymers leads to nano-materials exhibiting
physical properties different from the bulk. This is due to finite size effects, to
molecular  interactions caused by the presence of interfaces as well as to  orientation effects imposed by the symmetry of the confining geometry.  The nano-confinement can be thus used to induce physical properties not  naturally available in the bulk. Overcoming the interactions that lead  to substantial changes in the properties of nano-confined materials  would open the possibility of “manipulating” confinementeffects, with  the perspective of inducing new material properties different from those  in the bulk and in nano-confinement. In the present contribution,  recent experimental developments that allow one to investigate the  impact of the flow process into nanopores on the crystallization of  nano-confined polymers as well as the crystallization behaviour of  attograms and zeptograms of matter (1 attogram = 1E-18 grams, 1  zeptogram = 1E-21 grams) under high electric fields (1E5 V/cm) are  presented. A significant difference between crystallization under static  confinement and crystallization under flow in nano-confinement is  reported. It is also shown that crystallization of attograms and  zeptograms of matter under high electric fields leads to properties that  are different from those measured in nano-confinement. Our results  bring evidence for the ability of manipulating nano-confinement effects  by flow or by applying high electric fields.

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