Hofmeister series and specific interactions of charged headgroups with aqueous ions

Vlachy, Nina; Jagoda‐Cwiklik, Barbara; Vácha, Robert; Touraud, Didier; Jungwirth, Pavel; Kunz, Werner

doi:10.1016/j.cis.2008.09.010

Cited by 393 publications

(466 citation statements)

References 63 publications

(85 reference statements)

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“…The correspondence between the CAC and the surface affinity can be rationalized since the ions that adsorb close to the surface will have a high screening efficiency; consequently, a lower electrolyte concentration is required to destabilize the dispersion (Lyklema 2003(Lyklema , 2009. A tentative explanation for the surface affinity can be obtained from the law of matching affinities, proposed by Vlachy et al (2009). As can be seen in Fig.…”

Section: Ion Specific Effects For Monovalent Ionsmentioning

confidence: 99%

“…3a, for Fig. 2 Turbidity at k = 400 nm of CNC suspension for different CNC concentrations as a function of (a, left) salt concentration and of (b, right) ionic strength for divalent salts and monovalent salts, as indicated in the figure 2010; Vlachy et al 2009). Similar effects have been observed for other colloids such as bubbles (Craig et al 1993), silica nanoparticles (Franks 2002) as well as globular proteins (Boström et al 2003).…”

Section: Ion Specific Effects For Monovalent Ionsmentioning

confidence: 99%

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Aggregation behavior of aqueous cellulose nanocrystals: the effect of inorganic salts

et al. 2016

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Natural anisotropic building-blocks such as cellulose nanocrystals (CNCs) have attracted considerable attention due to their biodegradability and nanometer-size. In this work the colloidal behavior of CNCs, obtained from sulfuric acid hydrolysis of microcrystalline cellulose, has been studied in presence of salts of different valences. The influence on the colloidal stability and nature of aggregates has been investigated for monovalent salts (LiCl, NaCl, KCl, CsCl), divalent salts (CaCl 2 and MgCl 2 ), and a trivalent salt (AlCl 3 ), both experimentally by means of turbidity and small angle X-ray scattering (SAXS) measurements, as well as by Monte Carlo simulations using a simple coarse-grained model. For the entire salt series, a critical aggregation concentration (CAC) could be determined by turbidity measurements, as a result of the reduction of effective Coulomb repulsions due to the presence of sulfate groups on the CNC surface. The CACs also followed the Schulze-Hardy law, i.e. the critical aggregation concentration decreased with increasing counterion valence. For the monovalent ions, the CACs followed the trend, which could be rationalized in terms of matching affinities between the cation and the sulfate groups present at the surface of CNCs. From the SAXS measurements it was shown that the density of the aggregates increased with increasing salt concentration and ion valence. In addition, these findings were rationalized by means of simulation, which showed a good correlation with experimental data. The combination of the experimental techniques and the simulations offered insight into interactionaggregation relationship of CNC suspensions, which is of importance for their structural design applications.Electronic supplementary material The online version of this article

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Section: Ion Specific Effects For Monovalent Ionsmentioning

confidence: 99%

Section: Ion Specific Effects For Monovalent Ionsmentioning

confidence: 99%

Aggregation behavior of aqueous cellulose nanocrystals: the effect of inorganic salts

et al. 2016

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“…A key component of the glycocalyx is heparan sulfate, and it is the presence of sulfates in the heparan sulfate that maintains the gel, due to the physical properties of sulfate as a kosmotropic ion in the Hofmeister series [73,125,126]. By direct contrast, nitrate is a chaotrope-on the opposite end of the Hofmeister scale-and this distinction between nitrate and sulfate is likely a key reason why it is sulfates rather than nitrates that attach to the sugars in the glycocalyx.…”

Section: The Hofmeister Series the Glycocalyx And The Effect Of Sulfmentioning

confidence: 99%

Is Endothelial Nitric Oxide Synthase a Moonlighting Protein Whose Day Job is Cholesterol Sulfate Synthesis? Implications for Cholesterol Transport, Diabetes and Cardiovascular Disease

Seneff

Lauritzen

Davidson³

et al. 2012

Entropy

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Theoretical inferences, based on biophysical, biochemical, and biosemiotic considerations, are related here to the pathogenesis of cardiovascular disease, diabetes, and other degenerative conditions. We suggest that the "daytime" job of endothelial nitric oxide synthase (eNOS), when sunlight is available, is to catalyze sulfate production. There is a striking alignment between cell types that produce either cholesterol sulfate or sulfated polysaccharides and those that contain eNOS. The signaling gas, nitric oxide, a wellknown product of eNOS, produces pathological effects not shared by hydrogen sulfide, a sulfur-based signaling gas. We propose that sulfate plays an essential role in HDL-A1 cholesterol trafficking and in sulfation of heparan sulfate proteoglycans (HSPGs), both critical to lysosomal recycling (or disposal) of cellular debris. HSPGs are also crucial in glucose metabolism, protecting against diabetes, and in maintaining blood colloidal suspension and capillary flow, through systems dependent on water-structuring properties of sulfate, an anionic kosmotrope. When sunlight exposure is insufficient, lipids accumulate in the atheroma in order to supply cholesterol and sulfate to the heart, using a OPEN ACCESSEntropy 2012, 14 2493 process that depends upon inflammation. The inevitable conclusion is that dietary sulfur and adequate sunlight can help prevent heart disease, diabetes, and other disease conditions.

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“…The micellization free energy Δμ m o is estimated from a few contributing terms as described below: are the free energy contributions from hydrocarbon transfer from water into micelle, formation of micellar core-water interface, hydrocarbon tail packing in the micelle, surfactant head group steric interaction, head group counter ion mixing, and electrostatic interaction, respectively [35][36][37][38]. Δμ mix o reflects the entropy of forming a micelle with surfactant composition of α i (equal to 1 for pure surfactant) in the bulk solution.…”

Section: Effect Of Salt On Surfactant Aggregationmentioning

confidence: 99%

“…Despite extensive progress in theoretical and experimental work has been made in the study of aggregation properties of ionic surfactants the effect of added salt and specific ion (dissociated from surfactants and salt) is still a challenge [35][36][37][38]. The ion and salt usually shift cmc, aggregation number of micelle, sphere-torod transition, and counter ion binding coefficient [39,40].…”

Section: Effect Of Salt On Surfactant Aggregationmentioning

confidence: 99%

Effects of Surfactant Aggregation and Adsorption on Steel Corrosion Inhibition in Salt Solution

Zhu

FreeM²

2016

Polym Sci

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The corrosion inhibition efficiency of mixtures of three homologous benzalkonium chlorides (BAC) surfactants was investigated using electrochemical measurements and modeling. The surface aggregation concentration (sac) and critical micelle concentration (cmc) of surfactant are useful to evaluate inhibition efficiency. A new cmc prediction model for ternary mixed homologous surfactants of interest has been developed. The model is applicable over a wide concentration range of dissolved salt in solution. The combination of the modified Langmuir adsorption model and the cmc prediction model provides a potential method for inhibition efficiency prediction of various mixed homologous surfactant systems at various dissolved salt concentrations.

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Hofmeister series and specific interactions of charged headgroups with aqueous ions

Cited by 393 publications

References 63 publications

Aggregation behavior of aqueous cellulose nanocrystals: the effect of inorganic salts

Aggregation behavior of aqueous cellulose nanocrystals: the effect of inorganic salts

Is Endothelial Nitric Oxide Synthase a Moonlighting Protein Whose Day Job is Cholesterol Sulfate Synthesis? Implications for Cholesterol Transport, Diabetes and Cardiovascular Disease

Effects of Surfactant Aggregation and Adsorption on Steel Corrosion Inhibition in Salt Solution

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