Colloidal Stability in Ionic Liquids and Relevant Soft Materials

2012 ◽  
Vol 1473 ◽  
Author(s):  
Kazuhide Ueno ◽  
Masayoshi Watanabe
Keyword(s):  
Ionic Liquids ◽  
Colloidal Particles ◽  
Colloidal Stability ◽  
Surface Force ◽  
Soft Materials ◽  
Electrolyte Solutions ◽  
Colloidal Systems ◽  
Dispersion Media ◽  
And Performance ◽  
Solvation Forces

ABSTRACTIonic liquids (ILs) are receiving a great deal of attention as synthetic and dispersion media for colloidal systems, as well as alternatives to organic solvents and electrolyte solutions. Colloidal stability is an essential factor for determining the properties and performance of colloidal systems combined with ILs. The remarkable properties of ILs primarily originate from their highly ionic nature. While such high ionic strength often causes colloidal aggregation in aqueous and organic dispersions, certain colloidal particles can be well dispersed in ILs without any stabilizers. First, we will discuss the colloidal stability of bare and polymer-grafted silica nanoparticles and the surface force between silica substrates in ILs. Three different repulsions between colloidal particles—electrostatic, steric, and solvation forces—will be highlighted. A possible interpretation of the stabilization mechanism in ILs, both in the presence and in the absence of stabilizers, will be proposed. Next, we will provide an overview of our recent studies on colloidal soft materials with ILs. On the basis of dispersed states of the silica colloids, two different soft materials, colloidal gel and colloidal glass in ILs, were fabricated. Their functional properties (such as ionic transport, rheological properties, and optical properties) and the microstructure of the colloidal materials will also be presented.

Introduction

2018 ◽  
Author(s):  
Eric M. Furst ◽  
Todd M. Squires
Keyword(s):  
Rheological Properties ◽  
Colloidal Particles ◽  
Colloidal Stability ◽  
Soft Materials ◽  
New Materials ◽  
Colloid Science ◽  
Properties Of Materials ◽  
Basic Concepts

General concepts of rheology and microrheology are presented, including basic concepts of the microrheology measurement, the characteristics of soft materials, rheological functions and principles of conventional rheometric measurements, as well as several common rheological properties that will be encountered throughout the text. Microrheology encompasses a set of rheometric methods or techniques with unique capabilities|a part of the experimental toolbox for characterizing the rheological properties of materials to aid their understanding, or help in the design of new materials. There are limitations to microrheology that are important to understand from the outset. Colloidal particles are central to all microrheology measurements. Basic concepts of colloid science, including typical probe chemistries, colloidal stability, characterization, and preparation are presented.

From Colloidal Stability in Ionic Liquids to Advanced Soft Materials Using Unique Media

Langmuir ◽  
2011 ◽  
Vol 27 (15) ◽  
pp. 9105-9115 ◽  
Author(s):  
Kazuhide Ueno ◽  
Masayoshi Watanabe
Keyword(s):  
Ionic Liquids ◽  
Colloidal Stability ◽  
Soft Materials

scholarly journals TransfersomILs: From Ionic Liquids to a New Class of Nanovesicular Systems

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 7
Author(s):  
Ana Júlio ◽  
João Guilherme Costa ◽  
Catarina Pereira-Leite ◽  
Tânia Santos de Almeida
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Colloidal Stability ◽  
Storage Stability ◽  
Pharmaceutical Formulations ◽  
Controlled Delivery ◽  
New Class ◽  
Improved Performance ◽  
And Performance ◽  
The Impact

Ionic liquids (ILs) have increasingly been studied as key materials to upgrade the performance of many pharmaceutical formulations. In controlled delivery systems, ILs have improved multiple physicochemical properties, showing the relevance of continuing to study their incorporation into these formulations. Transfersomes are biocompatible nanovesicular systems, quite useful in controlled delivery. They have promising characteristics, such as elasticity and deformability, making them suitable for cutaneous delivery. Nonetheless, their overall properties and performance may still be improved. Herein, new TransfersomILs systems to load rutin were developed and the physicochemical properties of the formulations were assessed. These systems were prepared based on an optimized formulation obtained from a Box–Behnken factorial design (BBD). The impact of imidazole-based ILs, cholinium-based ILs, and their combinations on the cell viability of HaCaT cells and on the solubility of rutin was initially assessed. The newly developed TransfersomILs containing rutin presented a smaller size and, in general, a higher association efficiency, loading capacity, and total amount of drug release compared to the formulation without IL. The ILs also promoted the colloidal stability of the vesicles, upgrading storage stability. Thus, ILs were a bridge to develop new TransfersomILs systems with an overall improved performance.

Europium-Based Ionic Liquids as Luminescent Soft Materials

2008 ◽  
Vol 47 (40) ◽  
pp. 7631-7634 ◽  
Author(s):  
Sifu Tang ◽  
Arash Babai ◽  
Anja-Verena Mudring
Keyword(s):  
Ionic Liquids ◽  
Soft Materials

Solidification of Ionic Liquids: Theory and Techniques

2010 ◽  
Vol 63 (4) ◽  
pp. 544 ◽  
Author(s):  
Anja-Verena Mudring
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Solid Phase ◽  
Soft Materials ◽  
Separation Science ◽  
Vast Number ◽  
Plastic Crystals ◽  
Thermal Fluids ◽  
Solid Phase Transition

Ionic liquids (ILs) have become an important class of solvents and soft materials over the past decades. Despite being salts built by discrete cations and anions, many of them are liquid at room temperature and below. They have been used in a wide variety of applications such as electrochemistry, separation science, chemical synthesis and catalysis, for breaking azeotropes, as thermal fluids, lubricants and additives, for gas storage, for cellulose processing, and photovoltaics. It has been realized that the true advantage of ILs is their modular character. Each specific cation–anion combination is characterized by a unique, characteristic set of chemical and physical properties. Although ILs have been known for roughly a century, they are still a novel class of compounds to exploit due to the vast number of possible ion combinations and one fundamental question remains still inadequately answered: why do certain salts like ILs have such a low melting point and do not crystallize readily? This Review aims to give an insight into the liquid–solid phase transition of ILs from the viewpoint of a solid-state chemist and hopes to contribute to a better understanding of this intriguing class of compounds. It will introduce the fundamental theories of liquid–solid-phase transition and crystallization from melt and solution. Aside form the formation of ideal crystals the development of solid phases with disorder and of lower order like plastic crystals and liquid crystals by ionic liquid compounds are addressed. The formation of ionic liquid glasses is discussed and finally practical techniques, strategies and methods for crystallization of ionic liquids are given.

How Is Charge Transport Different in Ionic Liquids and Electrolyte Solutions?

2011 ◽  
Vol 115 (45) ◽  
pp. 13212-13221 ◽  
Author(s):  
Hemant K. Kashyap ◽  
Harsha V. R. Annapureddy ◽  
Fernando O. Raineri ◽  
Claudio J. Margulis
Keyword(s):  
Ionic Liquids ◽  
Charge Transport ◽  
Electrolyte Solutions

Specific ion effects in liquids, in biological systems, and at interfaces

2006 ◽  
Vol 78 (8) ◽  
pp. 1611-1617 ◽  
Author(s):  
Werner Kunz
Keyword(s):  
Current Knowledge ◽  
Biological Systems ◽  
Electrolyte Solutions ◽  
Short Review ◽  
Colloidal Systems ◽  
Theoretical Approaches ◽  
Specific Ion Effects ◽  
Ion Effects ◽  
Self Organizing

A short review is given of current knowledge of ion effects in solutions, at interfaces, and in complex colloidal systems. Further to some key experiments, recent and new theoretical approaches are discussed and references of most important papers are given. Finally, an example of a dissipative, self-organizing system involving electrolyte solutions is mentioned.

scholarly journals Thermally robust solvent-free biofluids of M13 bacteriophage engineered for high compatibility with anhydrous ionic liquids

2019 ◽  
Vol 55 (72) ◽  
pp. 10752-10755 ◽  
Author(s):  
Alex P. S. Brogan ◽  
Nimrod Heldman ◽  
Jason P. Hallett ◽  
Angela M. Belcher
Keyword(s):  
Ionic Liquids ◽  
Structural Complexity ◽  
Soft Materials ◽  
Solvent Free ◽  
M13 Bacteriophage

Soft materials typically lack structural complexity. Chemically modifying viruses can produce biomaterials with added functionality that overcome this limitation.

scholarly journals Ionic Liquids and Calcium Oxide Grafted with Allylmalonic Acid Applied to Support the Peroxide Crosslinking of an Ethylene–Propylene Copolymer

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3260
Author(s):  
Magdalena Maciejewska
Keyword(s):  
Ionic Liquids ◽  
Silica Nanoparticles ◽  
Calcium Oxide ◽  
Crosslink Density ◽  
Ethylene Propylene ◽  
Rubber Compounds ◽  
Curing Characteristics ◽  
And Performance ◽  
Crosslinking Reactions ◽  
Thermal Stability Of

Nanosized calcium oxide (CaO) featuring a surface grafted with allylmalonic acid (ALA) was used to increase the efficiency of the peroxide crosslinking of an ethylene–propylene copolymer (EPM) filled with silica nanoparticles. In this study, 1-butyl-3-methylimidazolium ionic liquids (ILs) with different anions were applied to improve the dispersion of CaO/ALA and silica nanoparticles in the EPM copolymer, as well as to catalyze the interfacial crosslinking reactions. In this article, we discuss the effects of CaO/ALA and ILs on the curing characteristics, vulcanization temperature, crosslink density, mechanical properties, and thermal stability of EPM, as well as the resistance of EPM to weather aging. The CaO/ALA with ILs reduced the vulcanization time of the rubber compounds without a significant effect on the vulcanization temperature. Their application resulted in an increased vulcanizate crosslink density, as well as improved tensile strength compared to the pure peroxide system. The influence of 1-butyl-3-methylimidazolium ILs on EPM vulcanization and performance depends on the anion present in the molecules of the ionic liquid. The most active IL seems to be that with the tetrafluoroborate anion.

scholarly journals Anomalous Long-Range Attraction in Colloidal Binary Mixtures at Fluid–Fluid Interfaces

2020 ◽  
Vol 4 (3) ◽  
pp. 36
Author(s):  
Zonglin Yi ◽  
To Ngai
Keyword(s):  
Long Range ◽  
Colloidal Particles ◽  
Experimental Result ◽  
Colloidal System ◽  
Fluid Interfaces ◽  
Water Interface ◽  
Two Dimensional ◽  
Colloidal Systems ◽  
Oil Water ◽  
Theoretical Side

The properties of binary colloidal systems have gained the interest of researchers because they have much richer structures than their one-component counterpart. Continuing efforts are being made on the theoretical side on binary colloidal systems, while many issues remained unsolved for the lack of solid experimental supports, especially for study in the field of two-dimensional (2D) binary colloids system. Oil–water interfaces can serve as a good stringent 2D confinement for colloidal particles and can avoid anomalous problems caused by the quasi-two-dimensional environment in previous experimental reports. In this work, we conduct experimental research of binary colloids system in an oil–water interface to revisit theoretical predication. We measure an ultra-long-range attraction and discuss the possible mechanism of this attraction by comparing the experimental result with existing model and theory. This study could contribute more understanding of the binary colloidal system in both experimental aspects and theoretical aspects.

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