Intermolecular interaction-induced hierarchical transformation in 1D nanohybrids: Analysis of conformational changes by 2D correlation Spectroscopy

We have examined both self-assembly and confinement effect in room-temperature ionic liquid (RTIL)-aluminum hydroxide hybrids (RAHs) to attain a fundamental understanding of special phenomena in nanoscale spaces as well as to design functional nanomaterials for practical applications. Phase-controlled one-dimensional (1D) RAHs were synthesized through a simple ionothermal process. The RAHs were hierarchically transformed in terms of the molecular structures, morphologies, and phases of the materials during the ionothermal process with respect to the concentration of RTIL. In addition to the hierarchical transformation, the RTIL/aluminum hydroxide nanohybrids revealed unexpected physical behaviors, including thermal transition variation of the RTIL in confined environments and a phase transition from nanosolid to nanoliquid affected by changes of the melting points. More importantly, intermolecular interaction induced-self-assembly and confinement effect of RTILs inside an integrated hybrid system, which have not been clearly explained to date, were analyzed by 2D infrared correlation spectroscopy (2D IR COS); dynamic behaviors of RTILs, i.e., sequentially spatial reorientation and kinetically conformational changes, were attributed to the interactions between RTILs and aluminum hydroxide S. 2D IR COS offers a new way to interpret highly complex, veiled systems such as the formation mechanism of nanoparticles, biomineralization, self/supramolecular assembly, and nanoconfinement.
Publisher
AMER CHEMICAL SOC
Issue Date
2008-01
Language
ENG
Keywords

TEMPERATURE IONIC LIQUIDS; 2-DIMENSIONAL CORRELATION SPECTROSCOPY; SILICA-DERIVED NETWORKS; IONOTHERMAL SYNTHESIS; NANOPARTICLES; NANOSTRUCTURES; NANOCRYSTALS; CONFINEMENT; TRANSITION; CATALYSIS

Citation

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.130, no.3, pp.845 - 852

ISSN
0002-7863
URI
http://hdl.handle.net/10203/9722
Appears in Collection
CBE-Journal Papers(저널논문)
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