Control of Stratification in Drying Particle Suspensions via Temperature Gradients

Tang, Yanfei; Grest, Gary S.; Cheng, Shengfeng

doi:10.1021/acs.langmuir.8b03659

Control of Stratification in Drying Particle Suspensions via Temperature Gradients

Journal Article · Tue Feb 26 00:00:00 EST 2019 · Langmuir

DOI:https://doi.org/10.1021/acs.langmuir.8b03659· OSTI ID:1529979

Tang, Yanfei ^[1]; ^[2]; ^[1]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Dept. of Physics, Center for Soft Matter and Biological Physics, and Macromolecules Innovation Inst.
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

A potential strategy for controlling stratification in a drying suspension of bidisperse particles is studied using molecular dynamics simulations. When the suspension is maintained at a constant temperature during fast drying, it can exhibit “small-on-top” stratification with an accumulation (depletion) of smaller (larger) particles in the top region of the drying film, consistent with the prediction of current theories based on diffusiophoresis. However, when only the region near the substrate is thermalized at a constant temperature, a negative temperature gradient develops in the suspension because of evaporative cooling at the liquid–vapor interface. Since the associated thermophoresis is stronger for larger nanoparticles, a higher fraction of larger nanoparticles migrate to the top of the drying film at fast evaporation rates. As a result, stratification is converted to “large-on-top”. Very strong small-on-top stratification can be produced with a positive thermal gradient in the drying suspension. Here, we explore a way to produce a positive thermal gradient by thermalizing the vapor at a temperature higher than that of the solvent. Possible experimental approaches to realize various thermal gradients in a suspension undergoing solvent evaporation and thus to produce different stratification states in the drying film are suggested.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; NA0003525

OSTI ID:: 1529979

Journal Information:: Langmuir, Journal Name: Langmuir Journal Issue: 12 Vol. 35; ISSN 0743-7463

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Stratification of drying particle suspensions: Comparison of implicit and explicit solvent simulations Grest, Gary S. The Journal of Chemical Physics, Vol. 150, Issue 22 https://doi.org/10.1063/1.5066035	journal	June 2019
Stratification of drying particle suspensions: Comparison of implicit and explicit solvent simulations Tang, Yanfei; Grest, Gary S.; Cheng, Shengfeng arXiv https://doi.org/10.48550/arxiv.1810.05483	text	January 2018

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