Evolution of Calcite Nanocrystals through Oriented Attachment and Fragmentation: Multistep Pathway Involving Bottom-Up and Break-Down Stages

Mihiro Takasaki; Yuki Kezuka; Masahiko Tajika; Yuya Oaki; Hiroaki Imai

doi:10.1021/acsomega.7b01487

Evolution of Calcite Nanocrystals through Oriented Attachment and Fragmentation: Multistep Pathway Involving Bottom-Up and Break-Down Stages

Mihiro Takasaki, Yuki Kezuka, Masahiko Tajika, Yuya Oaki, Hiroaki Imai

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

A nonclassical multistep pathway involving bottom-up and break-down stages for the evolution of calcite nanograins ∼50 nm in size was demonstrated in a basic aqueous system. Calcite nanofibrils ∼10 nm wide were produced as the initial crystalline phase via amorphous calcium carbonate through ion-by-ion assembly by the carbonation of Ca(OH) ₂ at a high pH of ∼13. Bundles ∼50 nm in diameter were then formed by the subsequent oriented attachment of the nanofibrils. Monodispersed calcite nanograins were finally obtained through spontaneous fragmentation of the fibrous forms via a decrease in pH by further carbonation.

Original language	English
Pages (from-to)	8997-9001
Number of pages	5
Journal	ACS Omega
Volume	2
Issue number	12
DOIs	https://doi.org/10.1021/acsomega.7b01487
Publication status	Published - 2017

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)

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title = "Evolution of Calcite Nanocrystals through Oriented Attachment and Fragmentation: Multistep Pathway Involving Bottom-Up and Break-Down Stages",

abstract = " A nonclassical multistep pathway involving bottom-up and break-down stages for the evolution of calcite nanograins ∼50 nm in size was demonstrated in a basic aqueous system. Calcite nanofibrils ∼10 nm wide were produced as the initial crystalline phase via amorphous calcium carbonate through ion-by-ion assembly by the carbonation of Ca(OH) 2 at a high pH of ∼13. Bundles ∼50 nm in diameter were then formed by the subsequent oriented attachment of the nanofibrils. Monodispersed calcite nanograins were finally obtained through spontaneous fragmentation of the fibrous forms via a decrease in pH by further carbonation. ",

author = "Mihiro Takasaki and Yuki Kezuka and Masahiko Tajika and Yuya Oaki and Hiroaki Imai",

note = "Funding Information: This work was partially supported by the Kato Foundation for Promotion of Science (KS-2806), Grant-in-Aid for Challenging Exploratory Research (15K14129), and Grant-in-Aid for Scientific Research (A) (16H02398) from Japan Society for the Promotion of Science.",

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T1 - Evolution of Calcite Nanocrystals through Oriented Attachment and Fragmentation

T2 - Multistep Pathway Involving Bottom-Up and Break-Down Stages

AU - Takasaki, Mihiro

AU - Kezuka, Yuki

AU - Tajika, Masahiko

AU - Oaki, Yuya

AU - Imai, Hiroaki

N1 - Funding Information: This work was partially supported by the Kato Foundation for Promotion of Science (KS-2806), Grant-in-Aid for Challenging Exploratory Research (15K14129), and Grant-in-Aid for Scientific Research (A) (16H02398) from Japan Society for the Promotion of Science.

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AB - A nonclassical multistep pathway involving bottom-up and break-down stages for the evolution of calcite nanograins ∼50 nm in size was demonstrated in a basic aqueous system. Calcite nanofibrils ∼10 nm wide were produced as the initial crystalline phase via amorphous calcium carbonate through ion-by-ion assembly by the carbonation of Ca(OH) 2 at a high pH of ∼13. Bundles ∼50 nm in diameter were then formed by the subsequent oriented attachment of the nanofibrils. Monodispersed calcite nanograins were finally obtained through spontaneous fragmentation of the fibrous forms via a decrease in pH by further carbonation.

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