By a News Reporter-Staff News Editor at Science Letter -- Fresh data on Science are presented in a new report. According to news reporting originating in Cambridge, United Kingdom, by NewsRx journalists, research stated, "Interactions between colloidal particles are strongly affected by the particle surface chemistry and composition of the liquid phase. Further complexity is introduced when particles are exposed to shear flow, often E leading to broad variation of the final properties of formed clusters."
The news reporters obtained a quote from the research from the University of Cambridge, "Here we discover a new dynamical effect arising in shear-induced aggregation where repeated aggregation and breakup events cause the particle surface roughness to irreversibly increase with time, thus decreasing the bond adhesive energy and the resistance of the aggregates to breakup. This leads to a pronounced overshoot in the time evolution of the aggregate size, which can only be explained with the proposed mechanism. This is demonstrated by good agreement between time evolution of measured light-scattering data and those calculated with a population-balance model taking into account the increase in the primary particle nanoroughness caused by repeated breakup events resulting in the decrease of bond adhesive energy as a function of time. Thus, the proposed model is able to reproduce the overshoot phenomenon by taking into account the physicochemical parameters, such as pH, till now not considered in the literature."
According to the news reporters, the research concluded: "Overall, this new effect could be exploited in the future to achieve better control over the flow-induced assembly of nanoparticles."
For more information on this research see: Flow-Induced Aggregation and Breakup of Particle Clusters Controlled by Surface Nanoroughness. Langmuir, 2013;29(47):14386-14395. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Langmuir - www.pubs.acs.org/journal/langd5)
Our news correspondents report that additional information may be obtained by contacting A.S. Moussa, University of Cambridge, Cavendish Lab, Cambridge CB3 0HE, United Kingdom. Additional authors for this research include M. Lattuada, B.O. Conchuir, A. Zaccone, M. Morbidelli and M. Soos (see also Science).
Keywords for this news article include: Europe, Science, Cambridge, United Kingdom
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