Instability patterns of evaporative dendrimer deposits.

Loading...
Thumbnail Image

Persistent link to this item

Statistics
View Statistics

Journal Title

Journal ISSN

Volume Title

Title

Instability patterns of evaporative dendrimer deposits.

Alternative title

Published Date

2012-08

Publisher

Type

Thesis or Dissertation

Abstract

The purpose of this project is to understand the instability mechanism behind dendrimer pattern formation in evaporating micro-meter size droplets. Evaporation of droplets of alcohol-dendrimer solution leaves a unique solute pattern on a substrate, where the detailed structure depends on the system variables. We are interested in developing a theory of the morphology of the dendrimer deposits that encompasses evaporation effects, solvent hydrodynamics, and solute particle chemistry. Our approach is to consider a two-dimensional coarse-grained model of dendrimer particle deposition that involves two mechanisms: transfer of solute particles by a convective flow and an inter-particle attraction competing with the convective flow. The configuration of a drying droplet is determined by the distribution of particles on a substrate and the volume fraction of them in a droplet. The Hamiltonian of each configuration is defined to account for both a convective flow and an inter-particle attraction. The evolution of the Hamiltonian is computed by Monte Carlo method to simulate the dendrimer pattern formation and associate patterns with system parameters. We found four basic regimes of morphologies that range from ringlike, wavelike, and fingerlike to islandlike patterns depending on the number of particles and the relative strength of a convective flow and an interaction.

Description

University of Minnesota Ph.D. dissertation. August 2012. Major: Aerospace Engineering and Mechanics. Advisor: Perry H. Leo. 1 computer file (PDF); vii, 74 pages.

Related to

Replaces

License

Collections

Series/Report Number

Funding information

Isbn identifier

Doi identifier

Previously Published Citation

Other identifiers

Suggested citation

Jung, Narina. (2012). Instability patterns of evaporative dendrimer deposits.. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/137580.

Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.