On the Diffuse Structure of the Toluene–Water Interface

Tikhonov, A. M.

doi:10.1134/s0021364018140126

Cited by 5 publications

(2 citation statements)

References 35 publications

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“…Note that the noncapillary wavy width of the toluenewater interface (σ 0 ≈ 4Å) does not manifest itself in the monolayers adsorbed onto it [57]. As in the case of neutral alkanol monolayers on the n-hexane -water interface (where σ 0 is of the same order of magnitude), we attribute this finding to relatively low contrast in the interfacial structure [18].…”

Section: Resultsmentioning

confidence: 66%

Solid–Liquid Phase Transition in the Octadecanoic Acid Film Adsorbed on the Toluene–Water Interface

Tikhonov

2018

J. Exp. Theor. Phys.

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The structure of the soluble protonated (pH=2) octadecanoic acid film adsorbed on the saturated hydrocarbon (n-hexane)water and aromatic hydrocarbon (toluene)-water interfaces is studied by X-ray reflectometry using synchrotron radiation. The experimental data demonstrate that a solid phase of a Gibbs monolayer 26 ± 1Å thick, in which aliphatic tails are perpendicular to the surface and the area per molecule is A = 18 ± 2Å 2 , forms in the film at the n-hexane -water interface. The solid monolayer on the toluene -water interface in the adsorbed film melts when temperature increases, and this transition is caused by disordering the hydrocarbon tails of the acid. During the solid -liquid transition, the Gibbs monolayer thickness remains almost the same, 22 ± 1Å. In the solid phase, we have A = 20 ± 2Å 2 and the angle of deviation of the molecular tails from the normal to the surface is about ≈ 30 • . The density of the liquid monolayer phase with A = 24 ± 2Å 2 corresponds to liquid n-octadecane.

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Section: Resultsmentioning

confidence: 66%

Solid–Liquid Phase Transition in the Octadecanoic Acid Film Adsorbed on the Toluene–Water Interface

Tikhonov

2018

J. Exp. Theor. Phys.

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“…[ 11–15 ] Due to their unique properties CNLCs have been used in a plethora of applications in optics, photonics, and security. [ 16–18 ] In 2012 Nakayama et al. have proposed the use of chiral LCs as materials for optical security devices, developing a way to prepare random patterns with a fingerprint‐like texture.…”

Section: Introductionmentioning

confidence: 99%

Cholesteric Liquid Crystals Based Micro‐Fingerprints Generator for Anti‐Counterfeiting Labels

Bruno,

Fuoco,

Petriashvili

et al. 2023

Adv Materials Technologies

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In this study, a method is presented to fabricate optical fingerprint‐like patterns. The method relies on the use of commercially available chiral nematic liquid crystals (CNLCs) confined in microspheres. The peculiar optical texture is obtained by applying a high‐frequency voltage to the micrometric objects able to distort the molecular director orientation. The texture can be stabilized by doping the CNLC with photosensitive materials. Each microsphere shows a different fingerprint‐like pattern that is generated in a completely random manner making this procedure suitable to create physical unclonable functions (PUFs) keys. The optical patterns can be stored to create an artificial fingerprints database or they can be used to fabricate electroluminescent labels to be exploited as complex anti‐counterfeiting devices. An authentication software is developed and used to test the robustness of the proposed anti‐counterfeiting system.

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Polymerization of Epoxides at a Static Oil‐Alkaline Water Interface

Verbeke,

Linden,

Dreier

et al. 2024

Macromol. Rapid Commun.

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Abstract‘On‐water’ catalysis entails the significant enhancement of a chemical reaction by water, even when those reactions are known to be water‐sensitive. Here, the findings about the anionic ring opening polymerization of epoxides at the static interface between oil and alkaline water are shared. Unexpectedly, high molar mass fractions are observed with the interfacial system presented herein, albeit at very low conversions (< 5%). Styrene oxide, a notably unreactive epoxide, is chosen as the model compound to investigate the influence of several reaction parameters (i.e., pH, type of the initiator salt, polymerization time, interfacial area, solvent, shaking) on the polymerization. Poly(styrene oxide) (PSO) with an Mn of 5300 g mol−1 is observed via MALDI‐ToF MS, with species of at least 8000 g mol−1. The feasibility of expanding the system to (cyclic) aliphatic and aromatic epoxides, and glycidyl ethers is also explored. The system appears to promote polymerization of epoxides that position at the interface, in such a way that initiation and propagation can occur. A mechanistic interpretation of the interfacial polymerization is suggested. The surprising results obtained in this work urge to revisit the role of water in ionic polymerizations.

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On the Diffuse Structure of the Toluene–Water Interface

Cited by 5 publications

References 35 publications

Solid–Liquid Phase Transition in the Octadecanoic Acid Film Adsorbed on the Toluene–Water Interface

Solid–Liquid Phase Transition in the Octadecanoic Acid Film Adsorbed on the Toluene–Water Interface

Cholesteric Liquid Crystals Based Micro‐Fingerprints Generator for Anti‐Counterfeiting Labels

Polymerization of Epoxides at a Static Oil‐Alkaline Water Interface

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