Adsorption of Dicarbollylcobaltate(III) Anion {(π-(3)-1,2-B9C2H11)2Co(III)−} at the Water/1,2-Dichloroethane Interface. Influence of Counterions' Nature

Popov, A.; Borisova, T. A.

doi:10.1006/jcis.2000.7339

Cited by 43 publications

(61 citation statements)

References 29 publications

(37 reference statements)

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“…[20] In the former case, closely apposed pairs of COSAN molecules accompanied by two Na + counterions bind in the HIV protease active site. [17] The latter application of metallacarboranes is underlaid by their unique solution behavior which led to the computational prediction [21][22][23] and the experimental evidence [24,25] that they behave as surfactants. Various substituted forms (Me, Cl, Br) and the parental cobalt bis(dicarbollide) anions coupled with several counterions (Na + , K + , Cs + , H 3 O + , UO 2 2+ , Eu 3+ ) showed surface activity.…”

Section: Introductionmentioning

confidence: 99%

Nonclassical Hydrophobic Effect in Micellization: Molecular Arrangement of Non‐Amphiphilic Structures

Uchman

Abrikosov

Lepšı́k

et al. 2017

Advcd Theory and Sims

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Micellization brought about by nonclassical hydrophobic effect invokes enthalpy as the driving force. Thus, the underlying molecular phenomena differ from the entropically dominated hydrophobic effect. In quest for a molecular-scale understanding, we report on the molecular arrangement of nonamphiphilic structures of an anionic boron cluster compound, COSAN. We synergistically combine experimental (NMR and calorimetry) and theoretical (molecular dynamics and quantum chemical calculations) approaches. The experimental data support the mechanism of closed association of COSAN, where the self-assembly is driven by the enthalpy contribution to the free energy. Molecular dynamics simulations in explicit solvent show that water molecules form a patchy network around COSAN molecules, giving rise to the strong hydrophobic self-association. In the second solvation shell, water forms a slightly hydrophilic "spot" close to the C-H segments of the cluster.

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Section: Introductionmentioning

confidence: 99%

Nonclassical Hydrophobic Effect in Micellization: Molecular Arrangement of Non‐Amphiphilic Structures

Uchman

Abrikosov

Lepšı́k

et al. 2017

Advcd Theory and Sims

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“…[24] In air, the 1,2-dichloroethane contact angle on silicon surface (u 1 ) measured was nearly 08, and the water contact angle (u 2 ) was 52.5 AE 1.48. As a result in Equation 1, cos u 3 ¼ À0.725, thus u 3 ¼ 136.48, indicating the Figure 4.…”

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confidence: 99%

Bioinspired Design of a Superoleophobic and Low Adhesive Water/Solid Interface

et al. 2009

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Biological organisms with super-hydrophobic properties, such as lotus leaves, [1] cicada's wings, [2] water strider's legs, [3] and desert beetle's backs [4] always give us inspiration to design and create novel interfacial materials. Learning from nature, fabrication of micro/nanohierarchical structures and chemically modification with low surface free-energy materials provide effective solutions in obtaining super-hydrophobic interfaces.[5-9] However, superoleophobic interfaces, which display apparent contact angles with oil greater than 1508 and low hysteresis, are highly dependent on modification of fluorinated materials, [10][11][12][13][14][15] resulting in a cumbersome situation when exploring new materials. As previously reported, nearly all efforts were focused on the design and preparation of materials, that is, the control of a single phase, although the interfacial properties usually involve the interactions of two or more phases.[16] Therefore, new strategies to fabricate superoleophobic interfaces remain a challenge.As far as we are aware, examples from nature in air rather than in water environments have attracted most attention from biomimetic research on self-cleaning effect. For example, seabirds, rather than fish, are endangered by pollution from oil during a shipwreck. Boats are contaminated by plankton, while fish can keep their body clean in water. The interesting phenomenon of fish keeping their surfaces clean in oil-polluted water, a new superoleophobic model, inspires us to a novel strategy in designing superoleophobic interfaces. This bioinspired superoleophobic interface with low affinity for oil drops is better than traditional approaches commonly used, which employ surfactant solutions to aid in the removal of oils from the surfaces. [17]

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“…With the help of earlier data, [10,11] the molecular picture of Na[CoD] at the interface can be interpreted as follows:While aliphatic tails of SDS are exposed to air forming af airly compact monolayer (the A S (SDS) value essentially does not change with c), bulky [CoD] À are concentrated on the aqueous side of the interface. [10] Thec lusters slightly repel each other without forming regular monolayers.…”

mentioning

confidence: 99%

“…[10] Thec lusters slightly repel each other without forming regular monolayers. [11] Cations play as ubstantial role here,b ecause their hydration energy stabilizes the clusters at the interface. [11] Considering the fairly low surface activity and the bulkiness of the clusters,wecan argue that metallacarboranes should be taken as molecular-scale Pickering stabilizers [27] rather than surfactants (see their ability to stabilize nanobubbles reported below).…”

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confidence: 99%

Classical Amphiphilic Behavior of Nonclassical Amphiphiles: A Comparison of Metallacarborane Self‐Assembly with SDS Micellization

et al. 2015

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The self-assembly of metallacarboranes, a peculiar family of compounds exhibiting surface activity and resembling molecular-scale Pickering stabilizers, has been investigated by comparison to the micellization of sodium dodecylsulfate (SDS). These studies have shown that molecules without classical amphiphilic topology but with an inherent amphiphilic nature can behave similarly to classical surfactants. As shown by NMR techniques, the self-assembly of both metallacarboranes and SDS obey a closed association model. However, the aggregation of metallacarboranes is found to be enthalpy-driven, which is very unusual for classical surfactants. Possible explanations of this fact are outlined.

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Adsorption of Dicarbollylcobaltate(III) Anion {(π-(3)-1,2-B9C2H11)2Co(III)−} at the Water/1,2-Dichloroethane Interface. Influence of Counterions' Nature

Cited by 43 publications

References 29 publications

Nonclassical Hydrophobic Effect in Micellization: Molecular Arrangement of Non‐Amphiphilic Structures

Nonclassical Hydrophobic Effect in Micellization: Molecular Arrangement of Non‐Amphiphilic Structures

Bioinspired Design of a Superoleophobic and Low Adhesive Water/Solid Interface

Classical Amphiphilic Behavior of Nonclassical Amphiphiles: A Comparison of Metallacarborane Self‐Assembly with SDS Micellization

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