Clogging of microchannels by nano-particles due to hetero-coagulation in elongational flow

被引：30

作者：

Georgieva, K. ^{[1
]}

Dijkstra, D. J. ^{[2
]}

Fricke, H. ^{[3
]}

Willenbacher, N. ^{[1
]}

机构：

[1] KIT, Inst Mech Proc Engn & Mech, D-76131 Karlsruhe, Germany

[2] Bayer MaterialSci AG, D-51368 Leverkusen, Germany

[3] Adhes Bonding & Surfaces, Fraunhofer Inst Mfg Technol & Appl Mat Res, D-28359 Bremen, Germany

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2010年 / 352卷 / 02期

关键词：

Flow induced aggregation; Hetero-coagulation; Elongational flow; Microfluidics; Colloidal dispersions; DISPERSIONS; COAGULATION; STABILITY; AGGREGATION; KINETICS;

D O I：

10.1016/j.jcis.2010.08.065

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have investigated the phenomenon of flow induced aggregation in highly concentrated colloidal dispersions exposed to strongly converging flow fields This phenomenon is relevant not only for classical technical operations like coating pumping or filtration but also for the application of concentrated suspensions in upcoming processing technologies based on microfluidic devices A ring-slit device (gap height 10-25 mu m) which allows for a variation of flow kinematics in a wide range has been developed in order to investigate this phenomenon Various polymer dispersions with different particle surface properties have been used as model systems Our experiments exclude that channel clogging is due to retention of pre-existing aggregates fouling or hydrodynamic bridging Instead we demonstrate that clogging of the microchannel is induced by hetero-coagulation between primary colloidal particles and micron-sized impurities present at concentrations on the order of 100-1000 ppm Clogging can occur even if the diameter of these impurities is less than a tenth of the gap height Aggregation takes place in the converging flow field at the channel entrance but not in the shear field within the slit It can be suppressed by appropriate stabilization of the primary particles (C) 2010 Elsevier Inc All rights reserved

引用

页码：265 / 277

页数：13

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