Issue 21, 2010
From the journal:

Journal of Materials Chemistry

Properties of core–shell structured nanopowders of molecular crystals fabricated by dry grinding

Kunihiro Ichimura,*ab   Ken'ichi Aoki,ab   Haruhisa Akiyama,c   Shin Horiuchi,c   Shusaku Naganod  and  Shinji Horiee  

* Corresponding authors

a Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba, Japan
E-mail: k-ichimura@sci.toho-u.ac.jp
Fax: +81-47-472-1331
Tel: +81-47-472-1331

b Research Centre for Materials with Integrated Properties, Toho University, 2-2-1 Miyama, Funabashi, Chiba, Japan

c Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan

d Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya Universiy, Furo-cho, Chikusa, Nagoya, Japan
E-mail: snagano@apchem.nagoya-u.ac.jp.

e R&D Center, Toda Kogyo Corporation, Otake, Hiroshima, Japan

Abstract

A generic way to prepare nano-sized molecular crystals in large scale is described. The dry mechanical grinding of a mixture of molecular crystals with surface-modified Stöber silica nanoparticles gave voluminous hybridised powders with core–shell nanostructures, which were revealed by TEM and EFTEM measurements. Fluorescence spectra of the hybrids of emissive crystals suggested that crystal structures of the bulk are preserved even after the milling. Calorimetric measurements disclosed that melting points of crystals are lowered as a result of the nanohybridisation and that the depression of melting point and heat of fusion are reversibly proportional to shell thickness.

Graphical abstract: Properties of core–shell structured nanopowders of molecular crystals fabricated by dry grinding

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Article information

DOI
https://doi.org/10.1039/B925120K
Article type
Paper
Submitted
01 Dec 2009
Accepted
04 Mar 2010
First published
14 Apr 2010

J. Mater. Chem., 2010,20, 4312-4320

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Properties of core–shell structured nanopowders of molecular crystals fabricated by dry grinding

K. Ichimura, K. Aoki, H. Akiyama, S. Horiuchi, S. Nagano and S. Horie, J. Mater. Chem., 2010, 20, 4312 DOI: 10.1039/B925120K

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