Related Experiment Video
Updated: Feb 1, 2026
10:42
Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
Published on: August 10, 2016
18.9K
Enhancing Electroresponsive Electrorheological Effect and Temperature Dependence of Poly(ionic liquid) Particles by
Qi Lei1, Chen Zheng1, Fang He1
1Smart Materials Laboratory, Department of Applied Physics , Northwestern Polytechnical University , Xi'an 710129 , P. R. China.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 1, 2018
Summary
Core-shell SiO2@poly(ionic liquid) particles exhibit enhanced electrorheological (ER) effects. The silica core improves ER performance and temperature stability by influencing particle polarization and ion dynamics.
Area of Science:
- Materials Science
- Polymer Chemistry
- Colloid Science
Background:
- Poly(ionic liquid) (PIL) particles are known for their electrorheological (ER) properties.
- The temperature dependence of ER effects in polymer-based materials can limit their applications.
- Core-shell structures offer a route to tune material properties.
Purpose of the Study:
- To synthesize and characterize monodisperse core-shell SiO2@poly(ionic liquid) (SiO2@PIL) particles.
- To investigate the electrorheological (ER) properties of SiO2@PIL particles compared to pure PIL particles.
- To elucidate the mechanism behind the enhanced ER effect and temperature stability.
Main Methods:
- Synthesis of SiO2@PIL particles via polymerization of ionic liquid monomer on silica nanoparticle surfaces.
- Evaluation of ER effect using temperature-modulated rheology under electric fields.
- Analysis of the underlying mechanism using dielectric spectroscopy.
Main Results:
- SiO2@PIL particles demonstrated a significantly enhanced ER effect compared to pure PIL particles.
- The presence of the hard SiO2 core improved the temperature dependence of the ER effect.
- Dielectric spectroscopy revealed increased interfacial polarization and suppressed PIL segment relaxation due to the SiO2 core.
Conclusions:
- The core-shell architecture of SiO2@PIL particles effectively enhances the electrorheological response.
- The hard SiO2 core provides improved temperature stability to the ER effect via substrate confinement.
- These findings highlight the potential of core-shell structured poly(ionic liquid)s for advanced ER fluid applications.
More Related Videos
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
13.5K
08:54Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
Published on: January 25, 2020
6.0K
Related Concept Videos
02:10The Nucleosome Core Particle
14.4K
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
14.4K
01:12The Nucleosome Core Particle
2.4K
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
2.4K
02:55Temperature Dependence on Reaction Rate
89.0K
The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
89.0K
01:12Temperature Dependent Deformation
399
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
399
03:10Ionic Radii
33.5K
Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
33.5K
02:54Molecular and Ionic Solids
20.1K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
20.1K