Dr Oleksandr O. Mykhaylyk

Oleksandr Mykhaylyk

Senior Research Fellow in Crystallisation
Department of Chemistry
The University of Sheffield
Brook Hill
Sheffield S3 7HF
United Kingdom

Telephone: +44 (0) 114 222 9418
Email: o.mykhaylyk@sheffield.ac.uk

Ryan-Mykhaylyk Group Website
General

Biographical Sketch

Dr. Sasha Mykhaylyk obtained his MSc in Physics (optics and spectroscopy) from Taras Shevchenko Kiev State University in 1991 (Diploma with distinction was awarded on graduation). After obtaining a PhD in solid state physics and crystallography from the Institute for Problems of Materials Science (the Ukrainian Academy of Sciences) in 1996, he became a Research Scientist at the same institute where he was later promoted to a Senior Scientist. After holding Royal Society/NATO Fellowship at the University of Cambridge in 2000-2001 he joined the University of Leeds in 2002 as a Research Associate. He moved to the University of Sheffield in 2004 where he was promoted to a Research Fellow in 2011 and Senior Research Fellow in 2017.

Awards

  • I.N. Frantsevich Prize from the Ukrainian Academy of Sciences (2000)

Research Keywords

X-ray, light and neutron scattering, soft matter, polymer physics, rheology, fats and lipids.

Research

Scattering methods

uch of my research focuses on the structural analysis of soft matter materials and in particular polymers. We live in a Golden age of Materials Science and Biology, based on a solid underpinning from Chemistry and Physics. One of the keys to this success is recent progress in structural characterization techniques where scattering methods, giving access to structural organization of matter from atomic scales to microns, occupy a dominating role. Experimental data obtained by scattering methods (SAXS, WAXS, XRD, SANS and SLS) provide structural information associated with Fourier space. My research investigates how this information can be transformed into real space, convenient for our understanding. This involves structural modelling, Monte-Carlo simulations and Fourier transformation techniques. An advantage of scattering methods is that they can be used for kinetic studies of materials in-situ in different environments. Therefore, an other aspect of my work is design of dedicated experimental set-ups for studying materials under external impact such as shear flow or extensional flow, temperature or pH changes. I have a continuous interest in fat crystallization, colloids and nanoparticles structure, in particular core-shell systems (examples of my research are nanodiamonds to carbon onions transition, a phase separation of polyurethane confined by a nanosized spherical shell). My current research is on thermo-responsive block-copolymer micelles and vesicles.

Mechano-optical Rheology

Research Oleksandr Mykhaylyk

Rheology is widely recognized as a basic method in processing of polymers, food and cosmetics. In addition, visualization can be used as an effective tool for studying phenomena taking place in fluids. Since soft matter materials subjected to flow often demonstrate a related anisotropy in their refractive index and stress, this causes birefringence visualizing the flow. I have recently developed a new combinatorial technique, shear-induced polarized light imaging (SIPLI), for rheo-optical measurements of polymeric liquids. The SIPLI technique has already been successfully used for studying shear-induced nucleation and crystallization of polyolefins (see the figure), fibrillation in natural silks and flow alignment of block-copolymer self-assembled structures. My present research focuses on further development of SIPLI for in-situ studies of shear-induced phenomena such as stress, orientation and structural transitions taking place in gels, polymers, copolymers, liquid crystals and colloids.

Polymer Crystallization

Microstructure of solidified polymers depends on thermo-mechanical process history. In general, processed thermoplastics are composed of two structural morphologies: spherulitic (isotropic) and shish-kebab (anisotropic). Ratio of these morphologies in the end-product controls its mechanical properties and material performance. While spherulitic structure is reasonably understood there is still no a reliable theory for structural formation of shear-induced shish-kebabs. My work is on physical understanding of how the formation of shear-induced morphologies is related to polymer polydispersity, thermodynamics and flow conditions. Based on our research we have proposed a four-stage model for shish-kebab formation including stretching of molecules, nucleation, aggregation and fibrillation.

Teaching

Undergraduate and postgraduate taught modules

  • Polymer Characterisation and Analysis (Postgraduate Level)
    This course explores the major instrumental methods for identifying polymers and determining characteristics including: polymer molecular weight, molecular weight distribution, stereochemistry, sequence distribution in copolymers, transition temperatures, and surface features.

Laboratory Teaching:

  • Level 4 Research Project

Publications

Journal articles

Conference proceedings papers

  • NEal T, Murray M, Armes S, Spain S & Mykhaylyk O (2018) Control of self-assembly of amphiphilic statistical copolymers by their composition. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 255 RIS download Bibtex download
  • O'Brien C, Terrill N, Mykhaylyk O & Ryan A (2018) Fabricating millifluidic devices for SAXS/WAXS using 3D printing; a quick and inexpensive method to exploit many geometries. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 255 RIS download Bibtex download
  • Jennings J, Butler M, Mykhaylyk O & Ryan A (2018) Semi-crystalline block copolymers as fat crystal habit modifiers. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 255 RIS download Bibtex download
  • Derry M, Mykhaylyk O, Ryan A & Armes S (2018) Using time-resolved small-angle X-ray scattering to study micellar nucleation during polymerization-induced self-assembly. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 255 RIS download Bibtex download
  • North S, Jones E, Smith G, Mykhaylyk O, Annable T & Armes S (2018) Adsorption of small cationic nanoparticles onto large anionic particles from aqueous solution: A model system for understanding pigment dispersion and the problem of effective particle density. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 255 RIS download Bibtex download
  • Derry M, Mykhaylyk O & Armes S (2017) UCST-type behavior of poly(behenyl methacrylate)-stabilized nanoparticles in mineral oil dictates their degree of dispersion. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 254 RIS download Bibtex download
  • Cockram A, Neal T, Derry M, Mykhaylyk O, Williams N, Murray M, Emmett S & Armes S (2017) Effect of monomer solubility on the evolution of copolymer morphology during polymerization-induced self-assembly in aqueous solution. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 253 RIS download Bibtex download
  • Derry M, Mykhaylyk O & Armes S (2017) Time-resolved small-angle x-ray scattering studies of the micellar nucleation event during polymerization-induced self-assembly. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 253 RIS download Bibtex download
  • Derry M, Mykhaylyk O & Armes S (2017) Shear-induced alignment of diblock copolymer worm gels. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 253 RIS download Bibtex download
  • Jones E, Mykhaylyk O, Semsarilar M, Boerakker M, Wyman P & Armes S (2016) How do spherical diblock copolymer nanoparticles grow during RAFT alcoholic dispersion polymerization?. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 251 RIS download Bibtex download
  • Mable C, Warren N, Thompson K, Mykhaylyk O & Armes S (2015) Framboidal triblock copolymer vesicles: A new class of efficient Pickering emulsifier. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 250 RIS download Bibtex download
  • Derry M, Fielding L, Mykhaylyk O & Armes S (2015) In situ SAXS studies of polymerization-induced self-assembly during non-aqueous RAFT dispersion polymerization. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 250 RIS download Bibtex download
  • Mable C, Canton I, Mykhaylyk O, Chambon P & Armes S (2015) pH-Responsive framboidal vesicles prepared using polymerization-induced self-assembly via RAFT aqueous dispersion polymerization as virus mimics. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 250 RIS download Bibtex download
  • Armes S, Growney D & Mykhaylyk O (2015) Star diblock copolymer concentration dictates the degree of dispersion of carbon black particles in nonpolar media: Bridging flocculation vs. steric stabilization. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 250 RIS download Bibtex download
  • Warren N, Mykhaylyk O, Armes S, Williams M, Doussineau T & Ryan A (2015) Testing the vesicular morphology to destruction: Birth and death of diblock copolymer vesicles prepared via polymerization-induced self-assembly. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 250 RIS download Bibtex download
  • Warren NJ, Mykhaylyk OO, Ryan AJ, Doussineau T, Dugourd P, Antoine R, Portale G & Armes SP (2014) Testing vesicles to destruction: SAXS and mass spectrometry studies on block copolymer vesicles prepared via polymerization-induced self-assembly. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 248 RIS download Bibtex download
  • Warren NJ, Mykhaylyk OO, Mahmood D, Ryan AJ & Armes SP (2014) Bespoke poly(ethylene glycol)-based diblock copolymer nano-objects via polymerization-induced self-assembly. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 248 RIS download Bibtex download
  • Fielding LA, Mykhaylyk OO, Schmid A, Fowler PW & Armes SP (2014) Visible Mie scattering from hollow silica particles with particulate shells. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 248 RIS download Bibtex download
  • Cunningham VJ, Ratcliffe LPD, Blanazs A, Warren NJ, Mykhaylyk OO & Armes SP (2014) Thermo-responsive diblock copolymer worm gels with tunable critical gelation temperature. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 248 RIS download Bibtex download
  • Mykhaylyk OO, Chambon P, Graham RS, Fairclough JPA, Olmsted PD & Ryan AJ (2008) The specific work of flow as a universal parameter to control the formation of shish-kebab morphology in polymers. XVTH INTERNATIONAL CONGRESS ON RHEOLOGY - THE SOCIETY OF RHEOLOGY 80TH ANNUAL MEETING, PTS 1 AND 2, Vol. 1027 (pp 496-+) RIS download Bibtex download
  • Mykhaylyk OO, Smith KW, Martin CM & Ryan AJ (2007) Structural models of metastable phases occurring during the crystallization process of saturated/unsaturated triacylglycerols. Journal of Applied Crystallography, Vol. 40(SUPPL. 1) RIS download Bibtex download
  • Mykhaylyk OO, Ryan AJ, Tzokova N & Williams N (2007) The application of distance distribution functions to structural analysis of core-shell particles. Journal of Applied Crystallography, Vol. 40(SUPPL. 1) RIS download Bibtex download
  • Hamley IW, Castelletto V, Mykhaylyk OO, Klok HA & Rosler A (2004) Biomimetic hierarchical order in PEG-peptide block copolymers. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol. 227 (pp U518-U518) RIS download Bibtex download
  • Rösler A, Klok HA, Nuhn H, Hamley IW, Castelletto V & Mykhaylyk OO (2003) Nanoscale structure of Poly(Ethylene Glycol) hybrid block copolymers containing amphiphilic β-strand peptide sequences. European Cells and Materials, Vol. 6(SUPPL. 1) (pp 101) RIS download Bibtex download