Hofmeister anion effect on aqueous phase behavior of heptaethylene glycol dodecyl ether

Inoue, Tohru; Yokoyama, Yūsuke; Zheng, Liqiang

doi:10.1016/j.jcis.2004.01.012

Cited by 16 publications

(22 citation statements)

References 15 publications

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“…The salts can affect the surfactant aggregation mode via both cation and anion activities. These effects are well documented in the Hofmeister series [25][26][27][28].…”

Section: Introductionmentioning

confidence: 78%

On structural transitions in a discontinuous micellar cubic phase loaded with sodium diclofenac

Efrat

Aserin

Garti

2008

Journal of Colloid and Interface Science

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“…The salts can affect the surfactant aggregation mode via both cation and anion activities. These effects are well documented in the Hofmeister series [25][26][27][28].…”

Section: Introductionmentioning

confidence: 78%

On structural transitions in a discontinuous micellar cubic phase loaded with sodium diclofenac

Efrat

Aserin

Garti

2008

Journal of Colloid and Interface Science

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“…These observations are in accord with the Hofmeister effect in that I À is a hydrotropic ion and break the water structure and hydrates the surfactant domains, however, the Cl À ion is a lyotropic anion and water-structure maker, dehydrates the surfactant domains. [38][39][40] As a result the n-CO stretching are red-shied in the FTIR spectra, compare the spectra in Fig. 4(b).…”

Section: Resultsmentioning

confidence: 99%

Lithium salt–nonionic surfactant lyotropic liquid crystalline gel-electrolytes with redox couple for dye sensitized solar cells

et al. 2016

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Lithium salt (LiCl, LiBr, LiI, or LiNO 3 ) and a non-ionic surfactant (such as 10-lauryl ether, C 12 E 10 ) form lyotropic liquid crystalline (LLC) mesophases in the presence of a small amount of water. The mesophases can be prepared as gels by mixing all the ingredients in one pot or in the solution phase that they can be prepared by coating over any substrate where the LLC phase is formed by evaporating excess solvent. The second method is easier and produces the same mesophase as the first method. A typical composition of the LLC phases consists of 2-3 water per salt species depending on the counter anion. The LiI-C 12 E 10 mesophases can also be prepared by adding I 2 to the media to introduce an I À /I 3 À redox couple that may be used as a gel-electrolyte in a dye-sensitized solar cell. Even though the mesophases contain a large amount of water in the media, this does not affect the cell performance.The water molecules in the mesophase are in the hydration sphere of the ions and do not act like bulk water, which is harmful to the anode of the dye-sensitized solar cells (DSSC). There are two major drawbacks of the salt-surfactant LLC mesophases in the DSSCs; one is the diffusion of the gels into the pores of the anode electrode and the other is the low ionic conductivity. The first issue was partially overcome by introducing the gel content as a solution and the gelation was carried in/over the pores of the dye modified titania films. To increase the ionic conductivity of the gels, other salts (such as LiCl, LiBr, and LiNO 3 ) with better ionic conductivity were added to the media, however, those gels behave less effectively than pure LiI/I 2 systems. Overall, the DSSCs constructed using the LLC electrolyte display high short circuit current (I sc of around 10 mA), high open circuit voltage (V oc of 0.81 V) and good fill factor (0.69) and good efficiency (3.3%). There is still room for improvement in addressing the above issues in order to enhance the cell efficiency by developing new methods of introducing the gel-electrolytes into the mesopores of the anode electrode. Lanka † Electronic supplementary information (ESI) available: ATR-FTIR spectra of G2-LiCl-2, G2-LiBr-2, G2-LiI-2, and G2-LiNO 3 -2, ATR-FTIR spectrum and XRD pattern of mesocrystals of G2-LiI-I 2 -4, UV-vis absorption spectra of G2-LiI-I 2 -x (x is 1, 2, 3, 4, and 5) and LiI-I 2 mixture in ethanol, water, acetonitrile and glycol Raman spectra of G2-LiI-2 and G2-LiI-I 2 -2, IPCE and time dependent IV curves. See

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“…The NaIÁnH 2 O-C 12 E 10 samples are unstable above a 3 salt/surfactant mole ratio and excess salt is leached out. Note also that the I À ion is a chaotropic anion (chaotropic anions are known as salting-in ions or structure breakers) [12][13][14][15][16][17][18][19][20], and enhances the diffusion of water in the hydrophilic (ethylene oxide)-hydrophobic (alkyl group) interface of the mesophase and may destroy the meso-order. To overcome this problem, we also tested C 18 E 10 (extra 6 -CH 2 -units in the alkyl tail to increase the strength of the hydrophobic core in the mesophase) as a surfactant to form ordered and stable LLC mesophases of the NaIÁnH 2 O-C 18 E 10 system, up to a NaI/C 18 E 10 mole ratio of 7.…”

Section: The Saltánh 2 O-c 12 E 10 Llc Mesophases and Effect Of Deliqmentioning

confidence: 99%

“…While there is no H 1 to I 1 phase transition in the LiNO 3 ÁnH 2 O-C 12 E 10 and LiClÁnH 2 O-C 12 E 10 LLC mesophases, the transition starts around a 4.0 LiBr/C 12 E 10 mole ratio in the LiBrÁnH 2 O-C 12 E 10 and a 3.0 mole ratio in the LiIÁnH 2-O-C 12 E 10 LLC mesophases. It is known that the structure breakers (such as NO 3 À , Br À , I À , and ClO 4 À ) are usually loosely hydrated and can penetrate in the vicinity of the core-shell interface more as compared to the structure makers (such as Cl À ) and therefore, these ions tend to increase the interfacial curvature of the hydrophobic-hydrophilic interface of the mesophase [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. From Table 3 Structure of the LiXÁnH 2 O-C 12 E 10 mesophases at RT and 23-25 %RH.…”

Section: The Hofmeister Effect On the Lixánh 2 O-c 12 E 10 Llc Mesophmentioning

confidence: 99%

“…We refer to such mesophases as saltsurfactant systems in order to distinguish them from the systems at low salt concentrations, where the solvent is merely water rather than the salt-water couple. To the best of our knowledge, the effect of electrolytes on the H 2 O-C i E j mesophases has been investigated only at low salt concentrations and the salt species were considered as an additive in the mesophase [13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Effect of hygroscopicity of the metal salt on the formation and air stability of lyotropic liquid crystalline mesophases in hydrated salt–surfactant systems

Albayrak

Barım

Dag

2014

Journal of Colloid and Interface Science

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It is known that alkali, transition metal and lanthanide salts can form lyotropic liquid crystalline (LLC) mesophases with non-ionic surfactants (such as CiH2i+1(OCH2CH2)jOH, denoted as CiEj). Here we combine several salt systems and show that the percent deliquescence relative humidity (%DRH) value of a salt is the determining parameter in the formation and stability of the mesophases and that the other parameters are secondary and less significant. Accordingly, salts can be divided into 3 categories: Type I salts (such as LiCl, LiBr, LiI, LiNO3, LiClO4, CaCl2, Ca(NO3)2, MgCl2, and some transition metal nitrates) have low %DRH and form stable salt-surfactant LLC mesophases in the presence of a small amount of water, type II salts (such as some sodium and potassium salts) that are moderately hygroscopic form disordered stable mesophases, and type III salts that have high %DRH values, do not form stable LLC mesophases and leach out salt crystals. To illustrate this effect, a large group of salts from alkali and alkaline earth metals were investigated using XRD, POM, FTIR, and Raman techniques. Among the different salts investigated in this study, the LiX (where X is Cl(-), Br(-), I(-), NO3(-), and ClO4(-)) and CaX2 (X is Cl(-), and NO3(-)) salts were more prone to establish LLC mesophases because of their lower %DRH values. The phase behavior with respect to concentration, stability, and thermal behavior of Li(I) systems were investigated further. It is seen that the phase transitions among different anions in the Li(I) systems follow the Hofmeister series.

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Hofmeister anion effect on aqueous phase behavior of heptaethylene glycol dodecyl ether

Cited by 16 publications

References 15 publications

On structural transitions in a discontinuous micellar cubic phase loaded with sodium diclofenac

On structural transitions in a discontinuous micellar cubic phase loaded with sodium diclofenac

Lithium salt–nonionic surfactant lyotropic liquid crystalline gel-electrolytes with redox couple for dye sensitized solar cells

Effect of hygroscopicity of the metal salt on the formation and air stability of lyotropic liquid crystalline mesophases in hydrated salt–surfactant systems

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