Distribution of gallium nanocrystals in Ga/MCM-41 mesocomposites by continuous-flow hyperpolarized 129Xe NMR spectroscopy

Weiping Zhang, Christopher I. Ratcliffe, Igor L. Moudrakovski, Chung Yuan Mou, John A. Ripmeester

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The distribution of gallium nanocrystals in mesoporous MCM-41 host were analyzed by continuous-flow hyperpolarized 129Xe NMR spectroscopy. In contrast to unclear TEM images for the high metal contents, laser-polarized 129Xe probe can detect the whole distribution of gallium in the MCM-41 host. It is found that gallium nanocrystals are included in the mesochannels of MCM-41; a part of them also remains in the interparticle voids. The distribution of gallium metal in MCM-41 is heterogeneous. Not all the mesochannels host metallic gallium even at a high gallium loading of 65.1 wt %. Variable temperature measurements can provide information on the xenon adsorption parameters. This approach opens a sensitive way to probe the distribution of high content species in porous host materials.

Original languageEnglish
Pages (from-to)3379-3382
Number of pages4
JournalAnalytical Chemistry
Volume77
Issue number10
DOIs
Publication statusPublished - May 15 2005
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry

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