Microwave spectra of mixtures of non-absorbing solid particles and absorbing liquids

Literature Information

Publication Date 2008-12-16
DOI 10.1039/B817507A
Impact Factor 3.676
Authors

Paul D. I. Fletcher, Della D. Grice, Stephen J. Haswell


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Abstract

Microwave spectroscopy of condensed phases is sensitive to sample compositional factors such as water or fat content, solids content and salt concentration which leads to applications for in-line process monitoring. In this paper we show that microwave spectra can also be sensitive to sample structure at fixed composition which has implications for analytical applications involving samples which are multi-phase mixtures. We have measured microwave spectra for samples containing a constant volume fraction of non-absorbing glass spheres immersed within an absorbing liquid phase; the only difference between samples is the mean diameter of the glass spheres. The large differences in the spectra for different diameters is successfully modelled in terms of the relative volume fractions of glass and absorbing liquid within a measurement penetration depth adjacent to the microwave measuring probe.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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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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