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  "title": "Isomeric effects in propanol and butanol isomers quantified with microwave microfluidic spectroscopy",
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    "fn": "Yasaman Kazemipour",
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    "In alcohols, the hydrogen bonded network impacts important thermophysical properties such as boiling point and viscosity. Hydrogen bonding in alcohols is influenced by\nthe solvent accessibility (steric hindrance) of the hydroxyl group. Quantifying hydrogen\nbonding of alcohols is critical to understanding their dissolution and phase separation\nin water and other solvents. The relaxation dynamics of this network occur on multiple\ntimescales and length scales, and dielectric spectroscopy offers a direct path to access-\ning the collective dynamics of the hydrogen bonded network. Here we used microwave\nmicrofluidic spectroscopy to quantify the effects of steric hindrance of propanol and\nbutanol isomers at 25 \u25e6C and 30 \u25e6C from 100 MHz to 40 GHz. The dielectric spectra\nwere fitted with a model that includes two relaxations: a Debye relaxation (\u2206\u03b51) and a\nnon-Debye (\u2206\u03b52) relaxation. Our results suggest that the relative static dielectric constant (\u03b5s), the Debye peak amplitude (\u2206\u03b51) and the relaxation time constant (\u03c41) are\nall influenced by both steric hindrance and temperature. We develop a simple metric\nfor steric hindrance in alcohols to explain the trends in the Debye relaxation time constant (\u03c41). Our results can be used to develop dielectric models and inform molecular\nsimulation studies. This dataset contains data, the corresponding matlab code/excel sheets to generate all the figures in the main manuscript and the supplementary information."
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