Preparation of Barium-Hexaferrite/Gold Janus Nanoplatelets Using the Pickering Emulsion Method

Janus particles, which have two surfaces exhibiting different properties, are promising candidates for various applications. For example, magneto-optic Janus particles could be used for in-vivo cancer imaging, drug delivery, and photothermal therapy. The preparation of such materials on a relatively...

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Autores principales:	Jelena Papan, Patricija Hribar Boštjančič, Alenka Mertelj, Darja Lisjak
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	barium hexaferrite magnetic nanoplatelets Granick’s method Janus nanoparticles gold Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/0aa2737560ee4e75b03192eb6f8778c6
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spelling	oai:doaj.org-article:0aa2737560ee4e75b03192eb6f8778c62021-11-25T18:29:52ZPreparation of Barium-Hexaferrite/Gold Janus Nanoplatelets Using the Pickering Emulsion Method10.3390/nano111127972079-4991https://doaj.org/article/0aa2737560ee4e75b03192eb6f8778c62021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2797https://doaj.org/toc/2079-4991Janus particles, which have two surfaces exhibiting different properties, are promising candidates for various applications. For example, magneto-optic Janus particles could be used for in-vivo cancer imaging, drug delivery, and photothermal therapy. The preparation of such materials on a relatively large scale is challenging, especially if the Janus structure consists of a hard magnetic material like barium hexaferrite nanoplatelets. The focus of this study was to adopt the known Pickering emulsion, i.e., Granick’s method, for the preparation of barium-hexaferrite/gold Janus nanoplatelets. The wax-in-water Pickering emulsions were stabilized with a combination of cetyltrimethyl ammonium bromide and barium hexaferrite nanoplatelets at 80 °C. Colloidosomes of solidified wax covered with the barium hexaferrite nanoplatelets formed after cooling the Pickering emulsions to room temperature. The formation and microstructure of the colloidosomes were thoroughly studied by optical and scanning electron microscopy. The process was optimized by various processing parameters, such as the composition of the emulsion system and the speed and time of emulsification. The colloidosomes with the highest surface coverage were used to prepare the Janus nanoplatelets by decorating the exposed surfaces of the barium hexaferrite nanoplatelets with gold nanospheres using mercaptan chemistry. Transmission electron microscopy was used to inspect the barium-hexaferrite/gold Janus nanoplatelets that were prepared for the first time.Jelena PapanPatricija Hribar BoštjančičAlenka MerteljDarja LisjakMDPI AGarticlebarium hexaferritemagnetic nanoplateletsGranick’s methodJanus nanoparticlesgoldChemistryQD1-999ENNanomaterials, Vol 11, Iss 2797, p 2797 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	barium hexaferrite magnetic nanoplatelets Granick’s method Janus nanoparticles gold Chemistry QD1-999
spellingShingle	barium hexaferrite magnetic nanoplatelets Granick’s method Janus nanoparticles gold Chemistry QD1-999 Jelena Papan Patricija Hribar Boštjančič Alenka Mertelj Darja Lisjak Preparation of Barium-Hexaferrite/Gold Janus Nanoplatelets Using the Pickering Emulsion Method
description	Janus particles, which have two surfaces exhibiting different properties, are promising candidates for various applications. For example, magneto-optic Janus particles could be used for in-vivo cancer imaging, drug delivery, and photothermal therapy. The preparation of such materials on a relatively large scale is challenging, especially if the Janus structure consists of a hard magnetic material like barium hexaferrite nanoplatelets. The focus of this study was to adopt the known Pickering emulsion, i.e., Granick’s method, for the preparation of barium-hexaferrite/gold Janus nanoplatelets. The wax-in-water Pickering emulsions were stabilized with a combination of cetyltrimethyl ammonium bromide and barium hexaferrite nanoplatelets at 80 °C. Colloidosomes of solidified wax covered with the barium hexaferrite nanoplatelets formed after cooling the Pickering emulsions to room temperature. The formation and microstructure of the colloidosomes were thoroughly studied by optical and scanning electron microscopy. The process was optimized by various processing parameters, such as the composition of the emulsion system and the speed and time of emulsification. The colloidosomes with the highest surface coverage were used to prepare the Janus nanoplatelets by decorating the exposed surfaces of the barium hexaferrite nanoplatelets with gold nanospheres using mercaptan chemistry. Transmission electron microscopy was used to inspect the barium-hexaferrite/gold Janus nanoplatelets that were prepared for the first time.
format	article
author	Jelena Papan Patricija Hribar Boštjančič Alenka Mertelj Darja Lisjak
author_facet	Jelena Papan Patricija Hribar Boštjančič Alenka Mertelj Darja Lisjak
author_sort	Jelena Papan
title	Preparation of Barium-Hexaferrite/Gold Janus Nanoplatelets Using the Pickering Emulsion Method
title_short	Preparation of Barium-Hexaferrite/Gold Janus Nanoplatelets Using the Pickering Emulsion Method
title_full	Preparation of Barium-Hexaferrite/Gold Janus Nanoplatelets Using the Pickering Emulsion Method
title_fullStr	Preparation of Barium-Hexaferrite/Gold Janus Nanoplatelets Using the Pickering Emulsion Method
title_full_unstemmed	Preparation of Barium-Hexaferrite/Gold Janus Nanoplatelets Using the Pickering Emulsion Method
title_sort	preparation of barium-hexaferrite/gold janus nanoplatelets using the pickering emulsion method
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/0aa2737560ee4e75b03192eb6f8778c6
work_keys_str_mv	AT jelenapapan preparationofbariumhexaferritegoldjanusnanoplateletsusingthepickeringemulsionmethod AT patricijahribarbostjancic preparationofbariumhexaferritegoldjanusnanoplateletsusingthepickeringemulsionmethod AT alenkamertelj preparationofbariumhexaferritegoldjanusnanoplateletsusingthepickeringemulsionmethod AT darjalisjak preparationofbariumhexaferritegoldjanusnanoplateletsusingthepickeringemulsionmethod
_version_	1718411057156849664

Preparation of Barium-Hexaferrite/Gold Janus Nanoplatelets Using the Pickering Emulsion Method

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