Kinetic Exploration of Nanoscale Polymorphs through Interface Energy Adjustment.

Sakakibara, Masaya; Nakamuro, Takayuki; Nakamura, Eiichi

Sakakibara, Masaya; Nakamuro, Takayuki; Nakamura, Eiichi.

Afiliación

Sakakibara M; Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Nakamuro T; Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Nakamura E; Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

ACS Nano ; 18(33): 22325-22333, 2024 Aug 20.

Article en En | MEDLINE | ID: mdl-39117583

ABSTRACT

ABSTRACT

Traditionally, the study of crystal polymorphism has relied on thermodynamics and measurements averaged over time and the crystal's constituents. This work introduces a kinetic approach to phase identificationâmillisecond cinematographic electron microscopic imaging of the dynamics of phase transitions of crystals of a few nm in diameter. We demonstrate a remarkable impact of the interface energy on the relative stability of the nanocrystal's polymorphs, enabling in situ manipulation of phase transitions through size increase or decrease. Starting with the B1 NaI polymorph at 298 K, we identified the previously unknown B2 polymorph of a 1 s lifetime upon sublimation of the crystal. From the CsCl liquid phase, we produced the B1 phase, previously described only at 749 K.

Palabras clave

crystallization; kinetics; phase transition; polymorphism; transmission electron microscopy

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Nano Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos

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