Self-assembly in surfactant-based liquid mixtures: Bis(2-ethylhexyl)phosphoric acid/bis(2-ethylhexyl)amine systems

Calandra, Pietro; Ruggirello, Angela; Mele, Andrea; Liveri, Vincenzo Turco

doi:10.1016/j.jcis.2010.04.031

Cited by 42 publications

(35 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the relative intensity of these peaks has been used as an indicator for probing the degree of intermolecular structuring. In particular, the intensity of the ν as (CH 2 ) peak over the intensity of the ν s (CH 2 ) one can be taken as a probe for chain packing since an eventual lateral constriction is expected to inhibit the CH 2 symmetric stretching more than the CH 2 antisymmetric one [2].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Spectroscopic and structural characterization of pure and FeCl3-containing tri-n-butyl phosphate

Calandra

Caschera

et al. 2014

Colloid Polym Sci

Self Cite

View full text Add to dashboard Cite

The spectroscopic properties and liquid structure of pure tri-n-butyl phosphate (TBP) and FeCl 3 /TBP solutions have been investigated by Uv-Vis and Raman spectroscopies, X-ray diffraction and conductometry. Uv-Vis and Raman spectra, supported by conductometric measurements, consistently indicate that the solubilized salt is present mostly as TBP n [FeCl 3−n ] n+ and FeCl 4 − complex ions due to specific interaction with the TBP phosphate group. Thanks to this interaction, a high amount of salt (up to 13 % w/w) can be dissolved despite the relatively low dielectric constant of TBP. The X-ray diffractogram of pure TBP has been interpreted in terms of three main contributions which can be attributed to spatial pair correlations between atoms of interacting TBP molecules. In the presence of increasing FeCl 3 amounts, it has been observed a progressive structuring effect, exerted by the dissolved salt, on the layers of opportunely oriented TBP molecules due to the formation of the complex ionic species. By simple treatment with NaBH 4 , the synthesis of Fe nanoparticles has been achieved. The absence of water, the easiness of preparation, the high amount of salt which can be suspended and the peculiar physico-chemical properties of such systems are all elements worth of note for the fields of nanoparticle synthesis and for specialized technological applications.

show abstract

Section: Resultsmentioning

confidence: 99%

“…They have recently drawn a renewed attention because they are characterized by internal nano-segregation with formation of local supramolecular structures which confer peculiar structural and dynamical properties quite far from those of the classical (polar or apolar) solvents [1,2].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and structural characterization of pure and FeCl3-containing tri-n-butyl phosphate

Calandra

Caschera

et al. 2014

Colloid Polym Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Given the acidic and basic character of HDEHP and NOA, respectively, intermolecular H-bonds are established, with a definite proton transfer from the acidic HDEHP to the basic NOA. This interaction, which usually triggers the formation of composition-dependent local structures in surfactant-based liquid mixtures, [3][4][5] does not seem to cause here the emergence of an enhanced conductivity. This difference with other systems may be understood by comparison with homologous molecules.…”

Section: Conductivity and Dielectric Datamentioning

confidence: 97%

“…This difference with other systems may be understood by comparison with homologous molecules. In a previous paper 3 we highlighted the formation of extended structures when HDEHP was mixed with bis(ethylex- yl)amine (BEEA), an amphiphilic molecule which differs from the NOA used in this paper only by the alkyl chains: two and branched in BEEA, single and linear in NOA. In our case, NOA, having the same amine group as the polar head but only a single and linear alkyl chain as the apolar part, can better fit the local HDEHP structure thanks to a more favorable steric hindrance, so that tighter and longer structures can be formed.…”

Section: Conductivity and Dielectric Datamentioning

confidence: 99%

“…Driven by these considerations, we have previously investigated the basic principles of molecular self-assembly reporting the peculiar physico-chemical properties of binary mixtures formed by bis(2-ethylhexyl)phosphoric acid and bis(2-ethylhexyl)amine, 3 and by octanoic acid and bis(2-ethylhexyl)amine. 4,5 These studies allowed us to highlight the role of the acid/basic character of surfactant polar groups to drive proton transfer involving a significant strengthening of the local structures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Self-assembly in surfactant-based mixtures driven by acid–base reactions: bis(2-ethylhexyl) phosphoric acid–n-octylamine systems

2013

Self Cite

View full text Add to dashboard Cite

Structural and dynamic features of bis(2-ethylhexyl) phosphoric acid (HDEHP)-n-octylamine (NOA) mixtures as a function of the NOA mole fraction (X NOA ) have been investigated by SAXS, WAXS, IR, dielectric spectroscopy and polarized optical microscopy. In the 0 ¡ X NOA , 0.5 range, mixtures are transparent liquids, while the abrupt formation of a waxy solid characterized by an hexagonal bidimensional structure occurs at X NOA = 0.5. Such a composition-induced phase transition results from the synergetic effect of the progressive increase in number density of ordered HDEHP-NOA nanodomains with X NOA . Mainly driven by an HDEHP to NOA proton transfer, the increase of structural order with X NOA arises from the progressive substitution of loosely hydrogen bonded HDEHP-HDEHP aggregates with strongly bonded NOA-HDEHP ones. Analysis of SAXS patterns at temperatures in the 10-70 uC range emphasized that these local structures are scarcely impacted by an increase of thermal fluctuations. Effects due to the steric compatibility between HDEHP and NOA apolar moieties have been highlighted. Overall, the results allow us to emphasize the role of specific polar and apolar interactions joined to steric effects in regulating the molecular organization in surfactant mixtures and can be used to design novel materials with planned physico-chemical properties.

show abstract

Fluorescent MnO2@DEHP Nanoprobe for Rapid and Selective Detection of Fe(III) ions

Bhosale,

Gujja,

Asiwal

et al. 2024

J Fluoresc

View full text Add to dashboard Cite

Self-assembly in surfactant-based liquid mixtures: Bis(2-ethylhexyl)phosphoric acid/bis(2-ethylhexyl)amine systems

Cited by 42 publications

References 26 publications

Spectroscopic and structural characterization of pure and FeCl3-containing tri-n-butyl phosphate

Spectroscopic and structural characterization of pure and FeCl3-containing tri-n-butyl phosphate

Self-assembly in surfactant-based mixtures driven by acid–base reactions: bis(2-ethylhexyl) phosphoric acid–n-octylamine systems

Fluorescent MnO2@DEHP Nanoprobe for Rapid and Selective Detection of Fe(III) ions

Contact Info

Product

Resources

About