| Autor: |
Banerjee A; Department of Chemical Engineering, University of California, Santa Barbara, CA 93106., Williams I; Department of Chemical Engineering, University of California, Santa Barbara, CA 93106., Azevedo RN; Department of Chemical Engineering, University of California, Santa Barbara, CA 93106., Helgeson ME; Department of Chemical Engineering, University of California, Santa Barbara, CA 93106., Squires TM; Department of Chemical Engineering, University of California, Santa Barbara, CA 93106 squires@engineering.ucsb.edu. |
| Jazyk: |
angličtina |
| Zdroj: |
Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2016 Aug 02; Vol. 113 (31), pp. 8612-7. Date of Electronic Publication: 2016 Jul 07. |
| DOI: |
10.1073/pnas.1604743113 |
| Abstrakt: |
Equilibrium interactions between particles in aqueous suspensions are limited to distances less than 1 μm. Here, we describe a versatile concept to design and engineer nonequilibrium interactions whose magnitude and direction depends on the surface chemistry of the suspended particles, and whose range may extend over hundreds of microns and last thousands of seconds. The mechanism described here relies on diffusiophoresis, in which suspended particles migrate in response to gradients in solution. Three ingredients are involved: a soluto-inertial "beacon" designed to emit a steady flux of solute over long time scales; suspended particles that migrate in response to the solute flux; and the solute itself, which mediates the interaction. We demonstrate soluto-inertial interactions that extend for nearly half a millimeter and last for tens of minutes, and which are attractive or repulsive, depending on the surface chemistry of the suspended particles. Experiments agree quantitatively with scaling arguments and numerical computations, confirming the basic phenomenon, revealing design strategies, and suggesting a broad set of new possibilities for the manipulation and control of suspended particles. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
