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Multi-parameter evaluation of fast sol–gel process by terahertz measurements

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Abstract

We present a feasibility study to apply terahertz (THz) spectroscopy and THz imaging as non-destructive diagnostic tools for sol–gel analysis, manufacturing and quality control. By performing THz spectroscopy on liquid and solid samples we were able to follow several key parameters during the sol–gel formation process and of the final product. Sol–gel transformations were monitored by THz absorption, whereas density changes have been observed through changes in refractive indices. Time domain spectroscopy (TDS), both in transmission and reflection geometries, was used to monitor the properties of fast sol–gel resins. THz imaging of gold coated, thin-film sol–gel enables us to determine inhomogeneities and defects in their internal structure. We demonstrated that THz spectroscopy can be implemented as an online analytical tool for multi-parameter evaluation of the sol–gel process during fabrication, and of the final product.

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Acknowledgment

We would like acknowledge the Israeli Ministry of Defense (IMOD) for partial support of this research.

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Correspondence to Raz Gvishi.

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Gvishi, R., Englander, A. & Peleg, G. Multi-parameter evaluation of fast sol–gel process by terahertz measurements. J Sol-Gel Sci Technol 48, 18–23 (2008). https://doi.org/10.1007/s10971-008-1772-6

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  • DOI: https://doi.org/10.1007/s10971-008-1772-6

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