Mask-less preparation of Janus particles through ultraviolet irradiation on hydrophobic particles assembled at the air-water interface

Janus particles are a class of materials that exhibit two contrasting properties. They possess unique properties, such as the ability to self-assemble at dissimilar liquid interfaces. Achieving high production yields remains a challenge to the practical application of Janus particles, as existing me...

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Main Authors: Tan, Jasmine Si Jia, Chen, Zhong
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2020
Subjects:
Online Access:https://hdl.handle.net/10356/143068
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1430682023-07-14T15:46:14Z Mask-less preparation of Janus particles through ultraviolet irradiation on hydrophobic particles assembled at the air-water interface Tan, Jasmine Si Jia Chen, Zhong School of Materials Science and Engineering Engineering::Materials Janus Particles Titanium Dioxide Janus particles are a class of materials that exhibit two contrasting properties. They possess unique properties, such as the ability to self-assemble at dissimilar liquid interfaces. Achieving high production yields remains a challenge to the practical application of Janus particles, as existing methods are generally tedious in the preparation procedures. The aim of this work is to prepare Janus particles using a process that is simple to facilitate scaling up. Semiconductor titanium dioxide (TiO2) and cuprous oxide (Cu2O) particles, pre-functionalized with hydrophobic coatings, were assembled at an air-water interface. The particles were then subjected to ultraviolet irradiation, which degraded the hydrophobic coating on the exposed side, and subsequently recovered through the removal of water. Janus particles that contained contrasting wettability over their surfaces were successfully obtained; the particle surfaces were demonstrated to be partially functionalized through comparison in the self-assembly behavior with fully-functionalized and non-functionalized particles. The obtained TiO2 Janus particles have demonstrated a Janus balance factor close to 1, and remained attached to the oil/water interface with long-term stability. The presence of a photocatalytic substrate was found to be necessary to accelerate the degradation of the coating. Different alkylsilane coatings, particle types, and irradiation durations were examined, leading to different types of Janus particles. The method can be potentially extended to other semiconductor metal oxide particles to generate Janus-like properties. Accepted version 2020-07-28T01:18:20Z 2020-07-28T01:18:20Z 2019 Journal Article Tan, J. S. J., & Chen, Z. (2019). Mask-less preparation of Janus particles through ultraviolet irradiation on hydrophobic particles assembled at the air-water interface. Journal of Colloid and Interface Science, 546, 285-292. doi:10.1016/j.jcis.2019.03.081 0021-9797 https://hdl.handle.net/10356/143068 10.1016/j.jcis.2019.03.081 30925435 2-s2.0-85063325477 546 285 292 en Journal of Colloid and Interface Science © 2019 Elsevier Inc. All rights reserved. This paper was published in Journal of Colloid and Interface Science and is made available with permission of Elsevier Inc. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials
Janus Particles
Titanium Dioxide
spellingShingle Engineering::Materials
Janus Particles
Titanium Dioxide
Tan, Jasmine Si Jia
Chen, Zhong
Mask-less preparation of Janus particles through ultraviolet irradiation on hydrophobic particles assembled at the air-water interface
description Janus particles are a class of materials that exhibit two contrasting properties. They possess unique properties, such as the ability to self-assemble at dissimilar liquid interfaces. Achieving high production yields remains a challenge to the practical application of Janus particles, as existing methods are generally tedious in the preparation procedures. The aim of this work is to prepare Janus particles using a process that is simple to facilitate scaling up. Semiconductor titanium dioxide (TiO2) and cuprous oxide (Cu2O) particles, pre-functionalized with hydrophobic coatings, were assembled at an air-water interface. The particles were then subjected to ultraviolet irradiation, which degraded the hydrophobic coating on the exposed side, and subsequently recovered through the removal of water. Janus particles that contained contrasting wettability over their surfaces were successfully obtained; the particle surfaces were demonstrated to be partially functionalized through comparison in the self-assembly behavior with fully-functionalized and non-functionalized particles. The obtained TiO2 Janus particles have demonstrated a Janus balance factor close to 1, and remained attached to the oil/water interface with long-term stability. The presence of a photocatalytic substrate was found to be necessary to accelerate the degradation of the coating. Different alkylsilane coatings, particle types, and irradiation durations were examined, leading to different types of Janus particles. The method can be potentially extended to other semiconductor metal oxide particles to generate Janus-like properties.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Tan, Jasmine Si Jia
Chen, Zhong
format Article
author Tan, Jasmine Si Jia
Chen, Zhong
author_sort Tan, Jasmine Si Jia
title Mask-less preparation of Janus particles through ultraviolet irradiation on hydrophobic particles assembled at the air-water interface
title_short Mask-less preparation of Janus particles through ultraviolet irradiation on hydrophobic particles assembled at the air-water interface
title_full Mask-less preparation of Janus particles through ultraviolet irradiation on hydrophobic particles assembled at the air-water interface
title_fullStr Mask-less preparation of Janus particles through ultraviolet irradiation on hydrophobic particles assembled at the air-water interface
title_full_unstemmed Mask-less preparation of Janus particles through ultraviolet irradiation on hydrophobic particles assembled at the air-water interface
title_sort mask-less preparation of janus particles through ultraviolet irradiation on hydrophobic particles assembled at the air-water interface
publishDate 2020
url https://hdl.handle.net/10356/143068
_version_ 1772829100760629248