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Modeling Solution Drying by Moving a Liquid-Vapor Interface: Method and Applications

Journal Article · · Polymers
 [1];  [1];  [2];  [1]
  1. Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)
  2. Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

A method of simulating the drying process of a soft matter solution with an implicit solvent model by moving the liquid-vapor interface is applied to various solution films and droplets. For a solution of a polymer and nanoparticles, we observe “polymer-on-top” stratification, similar to that found previously with an explicit solvent model. Furthermore, “polymer-on-top” is found even when the nanoparticle size is smaller than the radius of gyration of the polymer chains. For a suspension droplet of a bidisperse mixture of nanoparticles, we show that core-shell clusters of nanoparticles can be obtained via the “small-on-outside” stratification mechanism at fast evaporation rates. “Large-on-outside” stratification and uniform particle distribution are also observed when the evaporation rate is reduced. Polymeric particles with various morphologies, including Janus spheres, core-shell particles, and patchy particles, are produced from drying droplets of polymer solutions by combining fast evaporation with a controlled interaction between the polymers and the liquid-vapor interface. Our results validate the applicability of the moving interface method to a wide range of drying systems. The limitations of the method are pointed out and cautions are provided to potential practitioners on cases where the method might fail.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
NA0003525; AC02-05CH11231
OSTI ID:
1894608
Report Number(s):
SAND2022-13640J; 710521
Journal Information:
Polymers, Journal Name: Polymers Journal Issue: 19 Vol. 14; ISSN 2073-4360
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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