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

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 particl...

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Detalles Bibliográficos
Autores principales: Feng, Dong, Weng, Ding, Wang, Jiadao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6187851/
https://www.ncbi.nlm.nih.gov/pubmed/30424230
http://dx.doi.org/10.3390/mi9060297
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author Feng, Dong
Weng, Ding
Wang, Jiadao
author_facet Feng, Dong
Weng, Ding
Wang, Jiadao
author_sort Feng, Dong
collection PubMed
description 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.
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spelling pubmed-61878512018-11-01 A Facile Interfacial Self-Assembly of Crystalline Colloidal Monolayers by Tension Gradient Feng, Dong Weng, Ding Wang, Jiadao Micromachines (Basel) Article 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. MDPI 2018-06-13 /pmc/articles/PMC6187851/ /pubmed/30424230 http://dx.doi.org/10.3390/mi9060297 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Feng, Dong
Weng, Ding
Wang, Jiadao
A Facile Interfacial Self-Assembly of Crystalline Colloidal Monolayers by Tension Gradient
title A Facile Interfacial Self-Assembly of Crystalline Colloidal Monolayers by Tension Gradient
title_full A Facile Interfacial Self-Assembly of Crystalline Colloidal Monolayers by Tension Gradient
title_fullStr A Facile Interfacial Self-Assembly of Crystalline Colloidal Monolayers by Tension Gradient
title_full_unstemmed A Facile Interfacial Self-Assembly of Crystalline Colloidal Monolayers by Tension Gradient
title_short A Facile Interfacial Self-Assembly of Crystalline Colloidal Monolayers by Tension Gradient
title_sort facile interfacial self-assembly of crystalline colloidal monolayers by tension gradient
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6187851/
https://www.ncbi.nlm.nih.gov/pubmed/30424230
http://dx.doi.org/10.3390/mi9060297
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