Conduction electron paramagnetic resonance of metal nanoparticles in AlMCM-41 aluminosilica mesoporous molecular sieves

文献信息

发布日期 2001-04-05
DOI 10.1039/B008245G
影响因子 3.676
作者

Jacek Michalik, David Brown, Jong-Sung Yu, Marek Danilczuk, Jeong Yeon Kim, Larry Kevan


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摘要

Mesoporous aluminosilica molecular sieves AlMCM-41 are loaded with different amounts of Ag+, Pd2+ and Pt2+ ions by varying the Si/Al ratio, which changes the ion exchange capacity. These metal ions are reduced to metal particles by hydrogen and characterized by conduction electron paramagnetic resonance (CEPR). Metal particle sizes were calculated from the Kawabata theory that relates CEPR linewidths to metal particle size. The CEPR linewidths are independent of metal ion loading, which suggests that the metal particles are located inside the AlMCM-41 channels and size constrained by the channel diameter. The calculated metal particle diameters are about 1 nm, which is smaller than the 3.5 nm channel diameter of AlMCM-41. The validity of Kawabata's theory to such systems may need reexamination.

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来源期刊

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
自引率: 10.3%
年发文量: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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