Surfactant Aggregation within Room-Temperature Ionic Liquid 1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide

Fletcher, Kristin A.; Pandey, Siddharth

doi:10.1021/la035596t

Cited by 331 publications

(257 citation statements)

References 19 publications

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“…Seyrek et al [31] have shown that the binding constant in the system of -lactoglobulin-poly(vinylsulfate) was inversely related to persistence length of poly(vinylsulfate) chain implying that protein binding to their characteristic hydrophobic-hydrophilic balance, ILs are widely used as surface active agents to study micellization behaviour in water [38][39][40][41][42]. In addition, this particular attribute makes these liquids compatible with many common solvents thereby generating designer solvents with controlled hydrophobicity, polarity and miscibility.…”

Section: Effect Of Persistence Lengthmentioning

confidence: 99%

“…Ionic liquids and their solutions are being used as biocatalytic reaction media, biosensors, protein and enzyme stabilizers etc. [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].…”

Section: Effect Of Persistence Lengthmentioning

confidence: 99%

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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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Section: Effect Of Persistence Lengthmentioning

confidence: 99%

Section: Effect Of Persistence Lengthmentioning

confidence: 99%

Coacervation in Biopolymers

Rawat¹

2014

J Phys Chem Biophys

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“…Relative studies on the aggregation of nonionic surfactants in ILs have been reported (Evans et al, 1982;Evans et al, 1983b;Fletcher & Pandey, 2004;Gao et al, 2009b;Li et al, 2008b;Patrascu et al, 2006;Wu et al, 2008). Masahiro et al (Moniruzzaman et al, 2008) reported the formation of reverse micelles in [C 8 mim][Tf 2 N] comprising sodium bis(2-ethyl-1-hexyl) sulfosuccinate (AOT) as surfactant with 1-hexanol as a cosurfactant.…”

Section: Effects Of Ionic Liquids On the Formation Of Supramolecular mentioning

confidence: 99%

Supramolecular Structures in the Presence of Ionic Liquids

Shen¹,

Chen²,

Zhang³

et al. 2011

Ionic Liquids: Theory, Properties, New Approaches

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“…Así mismo, la CMC depende de diversos factores, tales como la estructura del líquido iónico, la forma en que se constituyen los agregados y las características del medio en el cual se solubiliza el líquido iónico. 2 En este sentido, la temperatura y la presencia de sales afectan el proceso de agregación.…”

Section: Introductionunclassified

“…En consecuencia, es posible transformar la ecuación empírica de Stauff-Klevens, usando logaritmo neperiano en lugar del logaritmo decimal, de la siguiente manera: (2) A partir de los datos de la literatura para diversos líquidos iónicos de la familia 1-alquil-3-metil-imidazolio con dos aniones diferentes, cloruro y bromuro, se observa en la Figura 1 un comportamiento similar al presentado al graficar la CMC como función del número de átomos de carbono de la cadena carbonada.…”

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Efecto del catión, del anión y del co-ión sobre la agregación de líquidos iónicos en solución acuosa

Guzmán¹,

Fernández²,

Parada³

et al. 2010

Quím. Nova

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Recebido em 10/12/09; aceito em 31/5/10; publicado na web em 1/9/10 CATION, ANION AND CO-ION EFFECT ON THE AGGREGATION OF IONIC LIQUIDS IN AQUEOUS SOLUTION. The aggregation behavior of thirteen 1-alkyl-3-methylimidazolium based ionic liquids in aqueous solution is presented, considering variations of the alkyl side chain length as well as the anionic moiety. Cation and anion molecular volumes are selected as appropriate molecular descriptors. Additionally, the existing relationship between critical micelle concentration (CMC) and electrolyte concentration in solution is established, aiming to clarify ion effects. CMC values were obtained by measuring electrical conductivity and surface tension. It was confirmed that aggregation of ionic liquids in aqueous solution and in presence of inorganic salts is affected by the factors developed in this study.Keywords: ionic liquids; aggregation; critical micelle concentration. INTRODUCCIÓNLos líquidos iónicos (LIs) de la familia 1-alquil-3-metil-imidazolio muestran un comportamiento similar a otros compuestos anfifílicos en solución acuosa. Este comportamiento se debe a la presencia de una cadena alquílica generalmente larga (hidrofóbica) y un grupo polar con carga deslocalizada (hidrofílico). En los últimos años muchos investigadores han reportado en sus estudios valores de la Concentración Micelar Crítica (CMC) para diversos líquidos iónicos de ésta y otras familias, como lo reportan Luczak et al.. 1La CMC representa la mínima concentración requerida para que la agregación de un compuesto anfifílico determinado suceda. Tradicionalmente, se determina a partir del cambio de tendencia observado para diferentes propiedades como una función de la concentración, entre ellas tensión superficial y conductividad eléctrica. Así mismo, la CMC depende de diversos factores, tales como la estructura del líquido iónico, la forma en que se constituyen los agregados y las características del medio en el cual se solubiliza el líquido iónico. En este sentido, la temperatura y la presencia de sales afectan el proceso de agregación.La relación más conocida entre la CMC y la estructura química de los surfactantes es la ecuación de Stauff-Klevens, aplicable solamente a series homólogas.3 Dicha ecuación indica que existe una relación logarítmica entre la CMC y el número de átomos de carbono de la cadena alquílica:donde A y B son constantes para una serie homóloga particular y una temperatura dada, y n es el número de átomos de carbono de la cadena hidrocarbonada. Sin embargo, no existe hasta la fecha ninguna investigación que haya estudiado de forma sistemática el efecto del anión sobre la CMC. 1De esta manera, la primera parte de este estudio intentará contribuir a llenar este vacío de información, mediante el estudio de la agregación de líquidos iónicos de la familia 1-alquil-3-metil-imidazolio en solución acuosa, considerando las variaciones tanto del catión en términos de la longitud de la cadena alquílica como del anión. Para ello se seleccionaron los volúmenes moleculares del catión y de...

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Surfactant Aggregation within Room-Temperature Ionic Liquid 1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide

Cited by 331 publications

References 19 publications

Coacervation in Biopolymers

Coacervation in Biopolymers

Supramolecular Structures in the Presence of Ionic Liquids

Efecto del catión, del anión y del co-ión sobre la agregación de líquidos iónicos en solución acuosa

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