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Title: Broadband dielectric spectroscopy from sub-GHz to THz frequency region on hydrated bentonite
Authors: Lozada, Lou Serafin M.
Tapia, Alvin Karlo G.
Gillado, Armida V.
Yamamoto, Naoki
Tominaga, Keisuke
Keywords: Science::Chemistry
Issue Date: 2020
Source: Lozada, L. S. M., Tapia, A. K. G., Gillado, A. V., Yamamoto, N., & Tominaga, K. (2020). Broadband dielectric spectroscopy from sub-GHz to THz frequency region on hydrated bentonite. Proc. Of the 7th Asian Spectroscopy Conference (ASC 2020). doi:10.32655/ASC_8-10_Dec2020.65
metadata.dc.contributor.conference: Asian Spectroscopy Conference 2020
Abstract: Understanding how water molecules interact with one another and with clay under a confined geometry at different temperatures are key information in energy storage applications and nuclear waste disposal. Here we present an investigation of the dielectric response from 100 MHz to 1.8 THz of sodium bentonite at different hydration levels from 233 K to 293 K. Figure 1 shows the complex dielectric spectra of hydrated bentonite. Our previous studies have shown that for hydrated soft matters such as protein [1] and lipid bilayers [2] the dielectric response in the frequency region from sub-GHz to THz are due to the relaxation processes and vibrational processes, which are modeled using a Cole-Cole function and Lorentzian function, respectively, as shown below. The first term is the ion conductivity term, which may be important for conducting materials.
DOI: 10.32655/ASC_8-10_Dec2020.65
Research Centres: Institute of Advanced Studies 
Rights: © 2020 Nanyang Technological University.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:Asian Spectroscopy Conference

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