Next Article in Journal
Multiscale Analysis of Size Effect of Surface Pit Defect in Nanoindentation
Next Article in Special Issue
Self-Assembled Mucin-Containing Microcarriers via Hard Templating on CaCO3 Crystals
Previous Article in Journal / Special Issue
Progress in Photo-Responsive Polypeptide Derived Nano-Assemblies
Article Menu
Issue 6 (June) cover image

Export Article

Open AccessArticle
Micromachines 2018, 9(6), 297; https://doi.org/10.3390/mi9060297

A Facile Interfacial Self-Assembly of Crystalline Colloidal Monolayers by Tension Gradient

State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Received: 11 May 2018 / Revised: 8 June 2018 / Accepted: 10 June 2018 / Published: 13 June 2018
(This article belongs to the Special Issue Self-Assembly of Polymers)
Full-Text   |   PDF [6759 KB, uploaded 13 June 2018]   |  

Abstract

Many self-assembly approaches of colloidal monolayers have flourished but with some shortages, such as complexity, time-consumption, parameter sensitivity, and high-cost. This paper presents a facile, rapid, well-controlled, and low-cost method to prepare monolayers by directly adding silica particle suspensions containing water and ethanol to different liquids. A detailed analysis of the self-assembly process was conducted. The particles dove into water firstly, then moved up under the effect of the buoyancy and the tension gradient. The tension gradient induced the Marangoni convection and the relative motion between the water and the particles. At last, the particles were adsorbed at the air-water interface to minimize the free energy. The quality of the monolayers depended on the addition of sodium dodecyl sulfonate or ethanol in the water subphase. An interfacial polymerization of ethyl 2-cyanoacrylate was used to determine the contact angles of the particles at different subphase surfaces. The value of the detachment energy was positively associated with the contact angle and the surface tension. When the detachment energy decreased to a certain value, some particles detached from the surface, leading to the formation of a quasi-double layer. We also observed that the content of ethanol in suspensions influenced the arrangement of particles. View Full-Text
Keywords: self-assembly; air-liquid interface; tension gradient; Marangoni convection; nanoparticle; monolayer self-assembly; air-liquid interface; tension gradient; Marangoni convection; nanoparticle; monolayer
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Supplementary material

SciFeed

Share & Cite This Article

MDPI and ACS Style

Feng, D.; Weng, D.; Wang, J. A Facile Interfacial Self-Assembly of Crystalline Colloidal Monolayers by Tension Gradient. Micromachines 2018, 9, 297.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Micromachines EISSN 2072-666X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top