4.7 Article

Tuning refractive index of deep eutectic solvents

Journal

JOURNAL OF MOLECULAR LIQUIDS
Volume 348, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.molliq.2021.118031

Keywords

Deep eutectic solvents; Refractive index; Amino acid; Glucose; Lactic acid; Poly(ethylene glycol)

Funding

  1. National Natural Science Foundation of China [22103030]
  2. Natural Science Foundation of Hebei Province/S&T Program of Hebei [B2019408018]
  3. Fundamental Research Funds for the Universities in Hebei Province [JYQ201902]
  4. Program for the Top Young Talents of Higher Learning Institutions of Hebei Province [BJ2020047]
  5. College Students' Innovation and Entrepreneurship Training Program Project Fund of Langfang Normal University [S202110100001, Y202110100004]

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This study systematically investigates the refractive index of typical deep eutectic solvents (DESs) and analyzes the effects of hydrogen-bonding donor, hydrogen-bonding acceptor, mole ratio, and temperature. The results show that these factors have a significant impact on the refractive index, and the presence of water decreases the refractive index of all DESs studied.
Refractive index is one of the key physical properties of deep eutectic solvents (DESs). However, there is no systematical study on the refractive index of DESs to the best of our knowledge. Here, a systematical investigation on the refractive index of typical DESs is carried out. Furthermore, the effect of hydrogen-bonding donor (HBD), hydrogen-bonding acceptor (HBA), mole ratio of HBD to HBA, and temperature on the refractive index is analyzed. Results show that effect of HBD on the refractive index of DESs is CC:GLL (1:2) > CC:EG (1:2) > CC:MA (1:2) > CC:PHA (1:2) > CC:LA (1:2) > CC:FA (1:2) > CC:PA (1:2) > CC:AA (1:2), BE:GLL (1:2) > BE:LA (1:2) > BE:MA (1:2) > BE:FA (1:2) > BE:PA (1:2) > BE:AA (1:2), or LB:NMA (1:4) > LB: GLL (1:4) > LB:ACE (1:4) > LB:LA (1:4) > LB:EG (1:4) > LB:PA (1:4) > LB:AA (1:4) > LB:FA(1:4). Increasing the mole ratio could either increase or decrease the refractive index of DES, depending on the component and the intermolecular interaction. Effect of component on the refractive index on the refractive index could be affected by the original component and the added component; however, the presence of water decreases refractive index of all the DESs investigated. Refractive index of DESs decreases linearly when increasing the temperature. This work would provide theoretical guidance to tune the refractive index of DESs for their widespread applications. (C) 2021 Elsevier B.V. All rights reserved.

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