Related Experiment Video
Updated: Jun 27, 2025
07:59
Molecular Entanglement and Electrospinnability of Biopolymers
Published on: September 3, 2014
14.7K
Viscosity effects on the dynamics of diols and diol-based deep eutectic solvents
Srijan Chatterjee1,2, Samadhan H Deshmukh1,2, Tubai Chowdhury1,2
1Physical and Materials Chemistry Division, National Chemical Laboratory (CSIR-NCL), Pune, India.
Photochemistry and Photobiology
|May 2, 2024
Summary
This study reveals a linear relationship between viscosity, solvent dynamics, and hydrogen bond lifetimes in diols. However, this correlation becomes non-linear in diol-based deep eutectic solvents, highlighting differences in their structural evolution.
Area of Science:
- Physical Chemistry
- Spectroscopy
- Computational Chemistry
Background:
- Diols possess two hydroxyl groups, enabling extensive hydrogen bonding and influencing solvent properties.
- Viscosity significantly impacts solvent dynamics, necessitating an understanding of its role in diol fluctuation dynamics and hydrogen bond activity.
Purpose of the Study:
- To investigate the viscosity dependence of structural evolution dynamics in diols using advanced spectroscopic techniques.
- To explore the relationship between viscosity, solvent fluctuation timescales, and hydrogen bond dynamics in diols and their derived deep eutectic solvents.
Main Methods:
- Two-dimensional infrared spectroscopy was employed to study the viscosity dependence of structural evolution in three diols with varying chain lengths.
- Molecular dynamics simulations were performed to determine hydrogen bond lifetimes.
- Diols were mixed with choline chloride to form deep eutectic solvents for comparative analysis.
Main Results:
- A linear correlation was observed between bulk viscosity, solvent fluctuation timescales, and hydrogen bond lifetimes in diols.
- Diol-based deep eutectic solvents, characterized by heterogeneous nanodomains, showed a non-linear relationship between increasing viscosity and decelerating fluctuation dynamics.
- The study identified distinct dynamic behaviors between molecular diol solvents and their deep eutectic solvent counterparts.
Conclusions:
- Viscosity plays a crucial role in dictating fluctuation dynamics and hydrogen bond behavior in diols.
- Deep eutectic solvents exhibit complex dynamics influenced by viscosity, differing significantly from simple molecular diols.
- This research deepens the understanding of viscosity-dynamics interplay in both molecular and complex solvent systems.
Related Concept Videos
02:12Solvating Effects
7.4K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
7.4K
02:57Surface Tension, Capillary Action, and Viscosity
27.7K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
27.7K
02:17Physical Properties of Ethers
7.0K
Overview
An ether molecule has a net dipole moment due to the polarity of C–O bonds. Subsequently, boiling points of ethers are lower than those of alcohols of comparable molecular weight and slightly higher than those of hydrocarbons of comparable molecular weight (Table 1).
Ethers can act as hydrogen bond acceptors, making them more water-soluble than hydrocarbons, but since ethers cannot act as hydrogen bond donors, they are much less soluble in water than alcohols. Ethers are considered...
An ether molecule has a net dipole moment due to the polarity of C–O bonds. Subsequently, boiling points of ethers are lower than those of alcohols of comparable molecular weight and slightly higher than those of hydrocarbons of comparable molecular weight (Table 1).
Ethers can act as hydrogen bond acceptors, making them more water-soluble than hydrocarbons, but since ethers cannot act as hydrogen bond donors, they are much less soluble in water than alcohols. Ethers are considered...
7.0K
01:19Viscosity of Fluid
394
Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
394
02:34Vapor Pressure
34.9K
When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
34.9K
02:56Intermolecular Forces and Physical Properties
20.8K
20.8K