Mapping internal structure of coal by confocal micro-Raman spectroscopy and scanning microwave microscopy

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Abstract

Structural complexity and variability of the chemical properties define technological applicability of coal and demand increasing accuracy and spatial resolution from the techniques used for coal characterization for development of new, clean, and efficient technologies of coal utilization. Here, we combined spatially-resolved reflectometry, fluorescence, and confocal micro-Raman spectroscopy with high-resolution scanning probe microwave imaging to achieve a nondestructive sub-100-nm spatial resolution mapping of coal structure. It was found that this approach allows for high spatial resolution identification of individual elements in coal architecture, thus potentially generating valuable input for knowledge-driven optimization and design of coal utilization processes.

Original languageEnglish
Pages (from-to)32-37
Number of pages6
JournalFuel
Volume126
DOIs
StatePublished - Jun 15 2014

Funding

This research was conducted at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, US. Department of Energy, as well as Leone Family Department of Energy and Mineral Engineering, and the EMS Energy Institute, The Pennsylvania State University, PA.

Keywords

  • Bayesian analysis
  • Confocal micro-Raman spectroscopy
  • Macerals mapping
  • Scanning near-field microwave microscopy
  • Sub-100-nm spatial resolution

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