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Crystals
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Particle Synthesis by Colloidal Assembly
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Particle Synthesis by Colloidal Assembly

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 9327

Special Issue Editor

Prof. Dr. Sanghyuk Wooh

E-Mail Website
Guest Editor
School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul, Republic of Korea
Interests: colloidal assembly; soft matter; wetting; liquid repellency

Special Issue Information

Dear Colleagues,

The supraparticle, a particle consisting of colloidal assembly, has received a large amount of attention due to the fact that the surface area, porosity, and mechanical and optical properties of the particle can be easily controlled, which provides various functionalities for individual particles. Supraparticles with colloidal assembly with different materials, packing factors, and sizes allow particles to be used in a wide range of applications, such as photonic crystals, electrodes of electrochemical devices, drug delivery, and catalysts. Therefore, in the field of colloid science and engineering, many researchers are developing new colloidal assembly methods and preparing novel multifunctional supraparticles. This Special Issue is a platform to share the state-of-the-art of colloidal assemblies and supraparticles.

It is my pleasure to invite you to contribute to the Special Issue on Particle Synthesis by Colloidal Assembly. This Special Issue is fully open to both fundamental and advanced topics related to colloidal assembly and functional colloidal materials. The potential topics include but are not limited to the following themes:

  • Colloidal assembly;
  • Supraparticle;
  • Colloid synthesis methods;
  • Colloidal assembly characterization;
  • Applications; catalysts, electrochemical cells, and biomedical applications.

Prof. Dr. Sanghyuk Wooh
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2100 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Supraparticle
  • Colloidal assembly
  • Wetting
  • Microfluidics
  • Functional materials

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Published Papers (3 papers)

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Research

14 pages, 8083 KiB  
Article
Particle Coherent Structures in Confined Oscillatory Switching Centrifugation
by Francesco Romanò
Crystals 2021, 11(2), 183; https://doi.org/10.3390/cryst11020183 - 12 Feb 2021
Cited by 2 | Viewed by 2258
Abstract
A small spherical rigid particle in a cylindrical cavity is considered. The harmonic rotation of the cavity wall drives the background flow characterized by the Strouhal number Str, assumed as the first parameter of our investigation. The particle immersed in the flow [...] Read more.
A small spherical rigid particle in a cylindrical cavity is considered. The harmonic rotation of the cavity wall drives the background flow characterized by the Strouhal number Str, assumed as the first parameter of our investigation. The particle immersed in the flow (assumed Stokesian) has a Stokes number St=1 and a particle-to-fluid density ratio ϱ which is assumed as the second parameter of this study. Building on the theoretical understanding of the recently discovered oscillatory switching centrifugation for inertial particles in unbounded flows, we investigate the effect of a confinement. For the first time we study how the presence of a wall affects the particle trajectory in oscillatory switching centrifugation dynamics. The emergence of two qualitatively different particle attractors is characterized for particles centrifuged towards the cavity wall. The implication of two such classes of attractors is discussed focusing on the application to microfluidics. We propose some strategies for exploiting the confined oscillatory switching centrifugation for selective particle segregation and for the enhancement of particle interaction events. Full article
(This article belongs to the Special Issue Particle Synthesis by Colloidal Assembly)
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13 pages, 5409 KiB  
Article
Tailoring the Morphology of Supraparticles by Primary Colloids with Different Shapes, Sizes and Dispersities
by Wonmi Shim, Chan Sik Moon, Hyeonjin Kim, Hyun Su Kim, Haoxiang Zhang, Su Kyung Kang, Pyung Soo Lee and Sanghyuk Wooh
Crystals 2021, 11(2), 79; https://doi.org/10.3390/cryst11020079 - 21 Jan 2021
Cited by 9 | Viewed by 3481
Abstract
Surface-templated evaporation driven (STED) method is a promising method to fabricate supraparticles with various sizes, porosities, and shapes by drying colloidal dispersion drops on liquid repellent surfaces. Until now, for the method, only spherical shaped colloidal particles have been used as primary colloids. [...] Read more.
Surface-templated evaporation driven (STED) method is a promising method to fabricate supraparticles with various sizes, porosities, and shapes by drying colloidal dispersion drops on liquid repellent surfaces. Until now, for the method, only spherical shaped colloidal particles have been used as primary colloids. Here, we introduce six different shapes of nano-colloidal dispersions for the STED method: nanocubics, nanoplates, nanosheets, coffin-shaped nanoparticles (NPs), spherical NPs, and aggregates of NPs. It is confirmed that the shape and size of the primary colloids have little effect for drying the dispersion drop when a single component colloidal dispersion is dried. For heterogeneous supraparticles with composite material assembly, still the shape of the colloids has no influences, while the size and dispersity play roles for tuning the morphology of the supraparticles. From the results, we propose a way to fabricate homogeneous mixture, core/shell, and Janus core/shell structures of the supraparticles depending on the size and dispersity of the mixture colloidal dispersion. Indeed, knowledge on the effects of types of colloids would be of great importance for tailoring supraparticles. Full article
(This article belongs to the Special Issue Particle Synthesis by Colloidal Assembly)
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9 pages, 1838 KiB  
Communication
Rapid Coating of Ultraviolet Shielding Colloidal Crystals
by Likun Wang, Yu Xu, Zhaoran Chu, Wenwei Tang, Yanfei Qiu, Xueling Zhao, Weizhong Jiang, Jiayi Ye and Cheng Chen
Crystals 2020, 10(6), 502; https://doi.org/10.3390/cryst10060502 - 12 Jun 2020
Cited by 9 | Viewed by 2966
Abstract
A facile spray coating preparation of ultraviolet (UV) shielding Poly(methyl methacrylate) (PMMA) based colloidal photonic crystal (PC) films was presented, where the UV radiation was physically resisted by the periodic structure. The specific wavelength within the UV regime could be tuned as required [...] Read more.
A facile spray coating preparation of ultraviolet (UV) shielding Poly(methyl methacrylate) (PMMA) based colloidal photonic crystal (PC) films was presented, where the UV radiation was physically resisted by the periodic structure. The specific wavelength within the UV regime could be tuned as required by varying the size of the monodispersed PMMA colloids. Such crystal coatings could be rapidly prepared in optical glasses with controllable thickness of ~5 μm, which could simultaneously resist UV-254 with the efficiency of 77.43%. The monochromaticity of the crystal coatings ensures their potential in UV shielding materials of direct physical skin contact type. Full article
(This article belongs to the Special Issue Particle Synthesis by Colloidal Assembly)
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