| Dr Neal Williams | ||
Lead Scientist, Material Science Expert Capability Group, AkzoNobel, Slough, UK |
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Biography: Dr Williams holds a PhD in Colloid and Polymer Science from Bristol University and has worked in various technical groups in AkzoNobel and prior to that in ICI for 26 years both in the UK and Australia. He works on step change technology for the AkzoNobel’s coatings and chemicals business. He has authored or co-authored 14 publications in scientific journals and 12 patents. Abstract: Advanced Particle Design – The Key to Greener Coating Technology ? The world that we live in faces many challenges particularly in terms of sustainability, protecting the environment and enhancing the quality of life. AkzoNobel as the leading coatings manufacturer in the world is committed to sustainability and to reducing its carbon footprint and maintaining its place at or near the top of the Dow Jones Sustainability Index as a result. A key part of this commitment is the drive to provide coatings containing lower solvent levels and in particular waterborne alternatives to solventborne coatings. For waterborne coatings, the polymeric binders as well as the pigments and are all in the form of colloidal particles and control of the stability, morphology and rheology of these mixed particulate systems is critical to achieving the required levels of performance. This talk will describe some of the technology developed to deliver higher performance, lower carbon footprint coatings for the 21st century. |
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| Prof Paul Luckham |
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| Professor in Particle Technology, Department of Chemical Engineering, Imperial College London, UK | ||
Biography: Prof Paul Luckham is currently the Kodak Professor of Interface Science at Imperial College London. He took his BSc and PhD in the Chemistry Department at Bristol University, studying for a PhD under Brian Vincent in the area of Colloid Science. He then became a PDRA in the Cavendish Laboratories at Cambridge University. He was appointed as a New Blood Lecturer in Colloid Science and Biotechnology in 1983 in the Department of Chemical Engineering at Imperial, where he has been ever since. He was awarded the Beilby medal in 1996 for his work. He has published ovr 200 papers and graduated more than 60 PhD students. Abstract: Manipulating Forces between Surfaces: and its Applications in Particle Technology It is the forces between the microscopic constituents of materials, which to a large extent determine the macroscopic properties. For example it is the differences in bonding between the carbon atoms which determines the different physical properties of carbon and graphite. The same is true in colloidal systems. In colloidal systems there are three common types of long range interactions between particles, van der Waals forces, electrical double layer forces and steric forces. In this presentation, examples as to how these forces can be modified and even manipulated will be given. To convincingly demonstrate these effects it is necessary to measure these interaction forces. We have achieved this by using the principles of atomic force microscopy. The principle is simple, a small particle, 5-30 mm, is attached onto a small weak cantilever spring. The interaction between this particle and another particle or a surface is measured by monitoring the deflection of the spring as the two particles are moved together. In this talk I shall give examples of direct measurements of van der Waals, electrical double layer and steric forces, show how they can be modified and how these modifications affect the properties of bulk suspensions such as rheology. |
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