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

Evolution of Calcite Nanocrystals through Oriented Attachment and Fragmentation: Multistep Pathway Involving Bottom-Up and Break-Down Stages
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方解石纳米晶体通过定向附着和破碎的演化:涉及自下而上和分解阶段的多步途径

DOI:
10.1021/acsomega.7b01487
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发表时间:
2017
期刊:
影响因子:
4.1
通讯作者:
Imai Hiroaki
Imai Hiroaki
中科院分区:
化学3区
文献类型:
--
作者:
Takasaki Mihiro;Kezuka Yuki;Tajika Masahiko;Oaki Yuya;Imai Hiroaki

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在碱性水溶液体系中,方解石纳米颗粒的形成经历了自下而上和分解两个阶段.通过Ca(OH)2在pH = 1.13的高pH下的碳酸化反应,通过离子-离子组装,以无定形碳酸钙为初始晶相,制备了宽约10 nm的方解石纳米纤维。然后通过随后的纳米原纤维的定向附着形成直径<50 nm的束。单分散的方解石纳米颗粒,最终获得通过自发碎片的纤维形式,通过进一步碳酸化的pH值降低。
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)2at 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.
DOI: 10.1039/c6ce02161a
发表时间: 2016-11
期刊: CrystEngComm
影响因子: 3.1
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DOI: --
发表时间: 2017
期刊: Langmuir
影响因子: 3.9
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