Directing Colloidal Self-Assembly through Roughness-Controlled Depletion Attractions

by: Kun Zhao, Thomas G Mason

Physical Review Letters, Vol. 99, No. 26. (2007)

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Abstract

The surfaces of colloidal particles resulting from many new fabrication methods are not molecularly smooth, so understanding how surface roughness can affect the depletion attraction between the particles and their assembly is very important. We show that the depletion attraction between custom-shaped microscale platelets can be suppressed when the nanoscale surface asperity heights become larger than the depletion agent. In the opposite limit, the attraction reappears and columnar stacks of platelets are formed. Exploiting this, we selectively increase the site-specific roughness on only one side of the platelets to direct the mass production of a single desired assembly: a pure dimer phase.

@article{citeulike:2548021, abstract = {The surfaces of colloidal particles resulting from many new fabrication methods are not molecularly smooth, so understanding how surface roughness can affect the depletion attraction between the particles and their assembly is very important. We show that the depletion attraction between custom-shaped microscale platelets can be suppressed when the nanoscale surface asperity heights become larger than the depletion agent. In the opposite limit, the attraction reappears and columnar stacks of platelets are formed. Exploiting this, we selectively increase the site-specific roughness on only one side of the platelets to direct the mass production of a single desired assembly: a pure dimer phase.}, author = {Zhao, Kun and Mason, Thomas G. }, citeulike-article-id = {2548021}, doi = {10.1103/PhysRevLett.99.268301}, journal = {Physical Review Letters}, keywords = {2007, colloids, depletion, mason}, number = {26}, posted-at = {2008-03-18 01:41:12}, priority = {2}, publisher = {APS}, title = {Directing Colloidal Self-Assembly through Roughness-Controlled Depletion Attractions}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000099000026268301000001\&idtype=cvips\&gifs=yes}, volume = {99}, year = {2007} }

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TY - JOUR ID - citeulike:2548021 L3 - citeulike-article-id:2548021 TI - Directing Colloidal Self-Assembly through Roughness-Controlled Depletion Attractions JF - Physical Review Letters VL - 99 IS - 26 PB - APS N2 - The surfaces of colloidal particles resulting from many new fabrication methods are not molecularly smooth, so understanding how surface roughness can affect the depletion attraction between the particles and their assembly is very important. We show that the depletion attraction between custom-shaped microscale platelets can be suppressed when the nanoscale surface asperity heights become larger than the depletion agent. In the opposite limit, the attraction reappears and columnar stacks of platelets are formed. Exploiting this, we selectively increase the site-specific roughness on only one side of the platelets to direct the mass production of a single desired assembly: a pure dimer phase. KW - 2007 KW - colloids KW - depletion KW - mason AU - Zhao, Kun AU - Mason, Thomas PY - 2007/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000099000026268301000001&idtype=cvips&gifs=yes ER -

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