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Measuring Colloidal Charges in Low P...

Evans, Daniel Jo.

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Measuring Colloidal Charges in Low Polar Media from Statistics of Particle Trajectories.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Measuring Colloidal Charges in Low Polar Media from Statistics of Particle Trajectories./
作者:	Evans, Daniel Jo.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	112 p.
附註:	Source: Dissertation Abstracts International, Volume: 78-01(E), Section: B.
Contained By:	Dissertation Abstracts International78-01B(E).
標題:	Materials science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10139512
ISBN:	9781339949987

Measuring Colloidal Charges in Low Polar Media from Statistics of Particle Trajectories.
Evans, Daniel Jo.

Measuring Colloidal Charges in Low Polar Media from Statistics of Particle Trajectories. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 112 p.

Source: Dissertation Abstracts International, Volume: 78-01(E), Section: B.

Thesis (Ph.D.)--New York University, 2016.

This thesis presents insights into the mechanism by which colloidal particles can acquire electrostatic charges in apolar media. It introduces advances in experimental techniques for measuring electrostatic interactions between colloidal particles suspended in such media and applies those techniques to a model system. We present precision measurements of the pair interactions between micron-scale poly (methylmethacrylate) (PMMA) spheres dispersed in a fluid medium with a low dielectric constant. Our measurement technique is based on blinking optical tweezer manipulation of dielectric spheres using digital high-speed video microscopy. We extract interaction measurements from particle trajectories using artifact-free particle tracking, making use of optimal statistical methods to reduce measurement errors to the femtonewton frontier while covering an extremely wide range of interaction energies. Despite the absence of charge control agents or added organic salts, these measurements reveal strong and long-ranged electrostatic repulsions consistent with substantial charges on the particles whose interactions are screened by trace concentrations of mobile ions in solution. Electrostatic interactions are revealed to be consistent with the screened-Coulomb potential predicted by DLVO theory. The hydrodynamic interaction is described by low-Reynolds number hydrodynamic coupling for two-spheres in a quiescent fluid. Linear dependence of the estimated charge on particle radius is consistent with charge renormalization theory, and offers insights into the charging mechanism in this interesting class of systems.

ISBN: 9781339949987Subjects--Topical Terms:

543314
Materials science.

Measuring Colloidal Charges in Low Polar Media from Statistics of Particle Trajectories.
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500 $a Source: Dissertation Abstracts International, Volume: 78-01(E), Section: B.
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