Speaker：Dr. Oleksandr Mykhaylyk, University of Sheffield

Invited by AISMST

Time：March 21, 2019 (Thursday) 10:00 a.m.

Venue: Lecture Room 324, AISMST (Building #2, KeJiYuan, North Campus)

Faculties and students are warmly welcome.

South China Advanced Institute for Soft Matter Science and Technology

                      School of Molecular Science and Engineering

March 18, 2019

Abstract:

Small-angle X-ray scattering is a non-destructive methods conveniently designed for structural characterization of materials from nano- to micron scales. Recent developments of X-ray optic components, synchrotron radiation sources and laboratory SAXS instruments, complimented by a further progress in modelling and analysis, made SAXS technique one of the most reliable (and popular) for structural characterization of soft-matter materials. Moreover, further innovations in X-ray beam generation leading to a construction of high brilliance X-ray sources opened up a possibility to bring laboratory SAXS instruments to another level of capability which was achievable, until recently, only at synchrotron sources. These advances significantly expanded applications of laboratory SAXS instruments and provided more flexibility for in-house measurements which can be carried out on a wide range of materials at different processing conditions. A few SAXS case studies will be presented. In particular, an application of reciprocal space models and real space models together with contrast variation techniques for structural characterization of nanoparticles and colloidal systems will be demonstrated. Examples of time-resolved SAXS measurements of flow-induced crystallisation of semi-crystalline polymers, SAXS analysis of structural orientation of block-copolymers under large-amplitude oscillatory shear, time-resolved measurements of polimerization-induced self-assembly of copolymers during chemical reactions and thermally-induced morphological transformations of self-assembled block-copolymers as well as garzing-incidence X-ray scattering of crystallization kinetic of the organolead halide perovskites (photovoltaics used for solar cells) will be given.

Brief Biography：

Dr. Oleksandr Mykhaylyk leads a state-of-the-art Soft Matter Analytical Laboratory (SMALL) specializing in X-ray scattering techniques and rheology, which he has established at the University of Sheffield about 3 years ago. He also works as a Guest Professor in South China University of Technology. His expertise covers structural methods of materials characterisation, in particular X-ray scattering and various optical techniques. He focuses on structural characterization of soft matter materials, especially by SAXS, SANS and single crystal XRD. He has published more than 80 papers in leading journals in the field of materials and polymer science, including J. Am. Chem Soc., Adv. Mater., Macromolecules, Langmuir. As the first or corresponding author he has published 8 papers on J. Am. Chem Soc. He has received more than 2.88 million pounds in research funding, including the Foundation of British Engineering physical sciences research Committee (EPSRC), British Science and Technology Facilities Committee (STFC) and Lloyds TSB Group in academic community and Unilever and AkzoNobel in industrial community. He is the member of review board of European Synchrotron Radiation Facilities and Diamond Light Source. He is also responsible for postgraduate course in University of Sheffield and European summer training course, including Neutron and X-ray scattering.