Pore-Mouth Structure of Highly Agglomerated Detonation Nanodiamonds

Detonation nanodiamond aggregates contain water that is removed by thermal treatments in vacuo, leaving available pores for the adsorption of target molecules. A hard hydrogel of detonation nanodiamonds was thermally treated at 423 K for 2 h, 10 h, and 52 h in vacuo to determine the intensive water...

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Autores principales:	Elda Zoraida Piña-Salazar, Kento Sagisaka, Takuya Hayashi, Yoshiyuki Hattori, Toshio Sakai, Eiji Ōsawa, Katsumi Kaneko
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	nanodiamonds long-heated agglomeration pore-mouth structure water adsorption Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/7a54b4a6b81f4060ba0745c851e4592a
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spelling	oai:doaj.org-article:7a54b4a6b81f4060ba0745c851e4592a2021-11-25T18:29:42ZPore-Mouth Structure of Highly Agglomerated Detonation Nanodiamonds10.3390/nano111127722079-4991https://doaj.org/article/7a54b4a6b81f4060ba0745c851e4592a2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2772https://doaj.org/toc/2079-4991Detonation nanodiamond aggregates contain water that is removed by thermal treatments in vacuo, leaving available pores for the adsorption of target molecules. A hard hydrogel of detonation nanodiamonds was thermally treated at 423 K for 2 h, 10 h, and 52 h in vacuo to determine the intensive water adsorption sites and clarify the hygroscopic nature of nanodiamonds. Nanodiamond aggregates heated for long periods in vacuo agglomerate due to the removal of structural water molecules through the shrinkage and/or collapse of the pores. The agglomerated nanodiamond structure that results from long heating periods decreases the nitrogen adsorption but increases the water adsorption by 40%. Nanodiamonds heated for long times possess ultramicropores <0.4 nm in diameter in which only water molecules can be adsorbed, and the characteristic mouth-shaped mesopores adsorb 60% more water than nitrogen. The pore mouth controls the adsorption in the mesopores. Long-term dehydration partially distorts the pore mouth, decreasing the nitrogen adsorption. Furthermore, the nitrogen adsorbed at the pore mouth suppresses additional nitrogen adsorption. Consequently, the mesopores are not fully accessible to nitrogen molecules because the pore entrances are blocked by polar groups. Thus, mildly oxidized detonation nanodiamond particles can show a unique molecular sieving behavior.Elda Zoraida Piña-SalazarKento SagisakaTakuya HayashiYoshiyuki HattoriToshio SakaiEiji ŌsawaKatsumi KanekoMDPI AGarticlenanodiamondslong-heatedagglomerationpore-mouth structurewater adsorptionChemistryQD1-999ENNanomaterials, Vol 11, Iss 2772, p 2772 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	nanodiamonds long-heated agglomeration pore-mouth structure water adsorption Chemistry QD1-999
spellingShingle	nanodiamonds long-heated agglomeration pore-mouth structure water adsorption Chemistry QD1-999 Elda Zoraida Piña-Salazar Kento Sagisaka Takuya Hayashi Yoshiyuki Hattori Toshio Sakai Eiji Ōsawa Katsumi Kaneko Pore-Mouth Structure of Highly Agglomerated Detonation Nanodiamonds
description	Detonation nanodiamond aggregates contain water that is removed by thermal treatments in vacuo, leaving available pores for the adsorption of target molecules. A hard hydrogel of detonation nanodiamonds was thermally treated at 423 K for 2 h, 10 h, and 52 h in vacuo to determine the intensive water adsorption sites and clarify the hygroscopic nature of nanodiamonds. Nanodiamond aggregates heated for long periods in vacuo agglomerate due to the removal of structural water molecules through the shrinkage and/or collapse of the pores. The agglomerated nanodiamond structure that results from long heating periods decreases the nitrogen adsorption but increases the water adsorption by 40%. Nanodiamonds heated for long times possess ultramicropores <0.4 nm in diameter in which only water molecules can be adsorbed, and the characteristic mouth-shaped mesopores adsorb 60% more water than nitrogen. The pore mouth controls the adsorption in the mesopores. Long-term dehydration partially distorts the pore mouth, decreasing the nitrogen adsorption. Furthermore, the nitrogen adsorbed at the pore mouth suppresses additional nitrogen adsorption. Consequently, the mesopores are not fully accessible to nitrogen molecules because the pore entrances are blocked by polar groups. Thus, mildly oxidized detonation nanodiamond particles can show a unique molecular sieving behavior.
format	article
author	Elda Zoraida Piña-Salazar Kento Sagisaka Takuya Hayashi Yoshiyuki Hattori Toshio Sakai Eiji Ōsawa Katsumi Kaneko
author_facet	Elda Zoraida Piña-Salazar Kento Sagisaka Takuya Hayashi Yoshiyuki Hattori Toshio Sakai Eiji Ōsawa Katsumi Kaneko
author_sort	Elda Zoraida Piña-Salazar
title	Pore-Mouth Structure of Highly Agglomerated Detonation Nanodiamonds
title_short	Pore-Mouth Structure of Highly Agglomerated Detonation Nanodiamonds
title_full	Pore-Mouth Structure of Highly Agglomerated Detonation Nanodiamonds
title_fullStr	Pore-Mouth Structure of Highly Agglomerated Detonation Nanodiamonds
title_full_unstemmed	Pore-Mouth Structure of Highly Agglomerated Detonation Nanodiamonds
title_sort	pore-mouth structure of highly agglomerated detonation nanodiamonds
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7a54b4a6b81f4060ba0745c851e4592a
work_keys_str_mv	AT eldazoraidapinasalazar poremouthstructureofhighlyagglomerateddetonationnanodiamonds AT kentosagisaka poremouthstructureofhighlyagglomerateddetonationnanodiamonds AT takuyahayashi poremouthstructureofhighlyagglomerateddetonationnanodiamonds AT yoshiyukihattori poremouthstructureofhighlyagglomerateddetonationnanodiamonds AT toshiosakai poremouthstructureofhighlyagglomerateddetonationnanodiamonds AT eijiosawa poremouthstructureofhighlyagglomerateddetonationnanodiamonds AT katsumikaneko poremouthstructureofhighlyagglomerateddetonationnanodiamonds
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Pore-Mouth Structure of Highly Agglomerated Detonation Nanodiamonds

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