NDLI: Perils of ad hoc approximations for the activity function of chemically powered colloids

Content Provider	Springer Nature Link
Author	Popescu, M. N. Uspal, W. E. Tasinkevych, M. Dietrich, S.
Copyright Year	2017
Abstract	Colloids can achieve motility by promoting at their surfaces chemical reactions in the surrounding solution. A well-studied case is that of self-phoresis, in which motility arises due to the spatial inhomogeneities in the chemical composition of the solution and the distinct interactions of the solvent molecules and of the reaction products with the colloid. For simple models of such chemically active colloids, the steady-state motion in an unbounded solution can be derived analytically in closed form. In contrast, for such chemically active particles moving in the vicinity of walls, the derivation of closed-form and physically intuitive solutions of the equations governing their dynamics turns out to be a severe challenge even for simple models. Therefore, recent studies of these phenomena have employed numerical methods as well as approximate analytical approaches based on multipolar expansions. We discuss and clarify certain conceptual aspects concerning the latter type of approach, which arise due to ad hoc truncations of the underlying so-called activity function, which describes the distribution of chemical reactions across the surface of the particle.
Starting Page	1
Ending Page	7
Page Count	7
File Format	PDF
ISSN	12928941
Journal	The European Physical Journal E
Volume Number	40
Issue Number	4
e-ISSN	1292895X
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-04-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soft Matter: Colloids and Nanoparticles Soft and Granular Matter, Complex Fluids and Microfluidics Biological and Medical Physics, Biophysics Surfaces and Interfaces, Thin Films Nanotechnology Polymer Sciences Complex Systems
Content Type	Text
Resource Type	Article
Subject	Chemistry Medicine Biophysics Materials Science Surfaces and Interfaces Biotechnology

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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