Microemulsions with an Ionic Liquid Surfactant and Room Temperature Ionic Liquids As Polar Pseudo-Phase

Zech, Oliver; Thomaier, Stefan; Bauduin, Pierre; Rück, Thomas; Touraud, Didier; Kunz, Werner

doi:10.1021/jp8061042

Cited by 130 publications

(122 citation statements)

References 56 publications

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“…At ambient temperature, we chose an experimental path, where the amount of surfactant plus cosurfactant was kept constant at 30 weight percent (P S = 30). 195 By visual observation we noticed that a higher amount of surfactant plus cosurfactant is necessary for a thermal stability up to 150°C at ambient pressure. With increasing amount of surfactant, the thermal stability increased.…”

Section: Sample Handling and Experimental Pathmentioning

confidence: 94%

Ionic Liquids in Microemulsions—A Concept To Extend the Conventional Thermal Stability Range of Microemulsions

Zech¹,

Thomaier²,

Kolodziejski³

et al. 2010

Chemistry A European J

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Section: Sample Handling and Experimental Pathmentioning

confidence: 94%

Ionic Liquids in Microemulsions—A Concept To Extend the Conventional Thermal Stability Range of Microemulsions

Zech¹,

Thomaier²,

Kolodziejski³

et al. 2010

Chemistry A European J

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“…[41,42]. Numerous studies have explored protein and enzyme stability in these solvents that conclude that the observed catalytic activity of enzymes was due to the heterogeneously dispersed state of enzymes [43][44][45][46]. In our previous work [47], we have categorically shown the efficacy of various imidazolium based ionic liquids in stabilizing protein dispersions.…”

Section: Effect Of Persistence Lengthmentioning

confidence: 93%

Coacervation in Biopolymers

Rawat¹

2014

J Phys Chem Biophys

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Polyelectrolyte charge; Ionic strength; Surface patch binding; Viscoelastic behavior and internal structure IntroductionCoacervation: Coacervation is a thermodynamic transition which allows a homogeneous solution of charged macroions to undergo liquidliquid phase separation, giving rise to a polymer-rich dense phase coexisting with its supernatant. These two liquid phases are immiscible but are thermodynamically compatible. The polymer-rich dense phase is often called the coacervate. Structurally it lies between the crystalline and liquid phases. Thus, it can bear intermediate range structural order and can be referred to as a mesophase. Coacervation has been mostly studied in aqueous solutions of charged synthetic or biological macromolecules in the past. In particular, protein-polysaccharide and protein-protein coacervates have attracted much attention because of their inherent potential in generating new biomaterials. In addition, such studies provide basic understanding of specific and non-specific interactions operating between complementary polyelectrolytes [1-6] or polyelectrolyte-polyampholyte [7][8][9][10][11][12][13][14][15] pairs. Normally, polysaccharides are strong polyelectrolytes whereas proteins, in addition, can be polyampholytes. Hence, the association problem reduces to that of the general study of interaction between polyelectrolyte (PE) and polyampholyte (PA) molecules [6,16]. A recent review encapsulates many of the anomalous as well as the salient features of protein-polyelectrolyte interactions [1] The phenomenon of protein based coacervates, formed of strong electrostatic interactions, has been reported for β-lactoglobulin-gum Arabic [7,8] [17]. The diversity of material properties associated with coacervates can be gauged from the fact that β-lactoglobulin-gum arabic coacervates were found to be associated with vescicular to sponge-like internal structure whereas whey protein-gum arabic coacervate was observed to be a highly concentrated (melt-like) phase. In contrast, *Corresponding author: Kamla Rawat, Special Center for Nanosciences, Jawaharlal Nehru University, New Delhi 110067, India, Tel: +91 11 2670 4699; Fax: +91 11 2674 1837; E-mail: kamla.jnu@gmail.com β-lactoglobulin-pectin coacervates were found to be a heterogeneous phase comprising of pectin networks with protein domains forming the junction points [17]. It has been shown that a polyelectrolyte, DNA and a polyampholyte, gelatin can undergo associative interaction and form complex coacervates with interesting thermal properties [15]. Further, it has been realized that in a class of systems coacervation transition is governed by surface selective patch binding even though both the polyions carry similar net charge [11,18,19]. In particular, in SPB interactions complementary polyions (normally a PA-PE pair) seek oppositely charged patches to bind overcoming the repulsion occurring between similarly charged surface patches. This is often referred to as binding on the wrong side of pH.The following provides a brief structural i...

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“…In this field, Cheng et al (Cheng et al, 2007b) reported the first microemulsion formed by two ILs, i.e., hydrophobic [C 4 mim][PF 6 ] and hydrophilic propylammonium formate (PAF). The formation of IL based microemulsion in supercritical carbon dioxide with N-ethyl perfluorooctylsulfonamide was reported (Zech et al, 2009). Zheng and his coworkers (Li et al, 2009c) reported the phase diagram of p-xylene-[C 14 mim]Br-water ternary system, where hexagonal, lamellar lyotropic liquid crystals or microemulsions formed depending on the composition.…”

Section: Ionic Liquid Based Microemulsionsmentioning

confidence: 99%