One More Extreme near the Critical Micelle Concentration: Optical Activity

Русанов, А. И.; Nekrasov, A. G.

doi:10.1021/la102514a

Cited by 22 publications

(10 citation statements)

References 8 publications

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“…We also performed measurements on films made of SDS only at concentrations above the critical micellar concentration (cmc = 2.3 g/L). Unlike solutions in tanks [17], we did not observe any optical activity in thin SDS films, whatever the surfactant concentration or the film thickness. Far above the cmc, the spherical SDS micelles are organized in layers parallel to the film plane (stratification [18,19]) and are stabilized by structural forces.…”

Section: Optical Activity and Raman Spectracontrasting

confidence: 81%

Giant optical activity of sugar in thin soap films

Émile

Ghoufi

et al. 2013

Journal of Colloid and Interface Science

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We report on enhanced experimental optical activity measurements of thin soap films in the presence of sugar. This unusual optical activity is linked to the intramolecular chiral conformation of the glucose molecules at the air/liquid interface. Choosing sodium dodecylsulfate (SDS) as a model surfactant and glucose as model sugar, favorable interactions between the anionic group -OSO3(-)- and the glucose molecules are highlighted. This induces an interfacial anchoring of glucose molecules leading to a perturbing influence of the asymmetric chiral environment.

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Section: Optical Activity and Raman Spectracontrasting

confidence: 81%

Giant optical activity of sugar in thin soap films

Émile

Ghoufi

et al. 2013

Journal of Colloid and Interface Science

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“…Spiral exciton doublets of water can consist of achiral spirals of water molecules united by proton tunneling. A similar phenomenon was observed with an increase in the optical rotation of solutions before the CMC of SDS from 0.002 mol/L, and its decrease after CMC down to a constant value at 0.015 mol/L [17].…”

Section: Visible Circular Dichroismsupporting

confidence: 78%

Strongly Correlated Electronic States in Aqueous Micellar Surfactant

Mirgorod¹

2021

Preprint

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Strongly correlated electronic states (SCES), that determine the anomalies of physicochemical properties, are well-known for solid materials at low temperatures. According to the mechanism of manifestation their existence can be assumed in biological cells with white spots, which makes us look into this challenging problem in detail. The paper presents its solution through a study of simple models of micellar solutions of ionic surfactants. The process of micelle formation with accompanying liquid-liquid phase transition makes us pay attention to possible anomalies of properties. Therefore the SCES of water micellar solution has been tested by compenstion and cooperative effects; and by small-angle, wide-angle X-ray, dynamic and chiral scattering of electromagnetic radiation. The solution water is represented by ensembles of small nano systems. Therefore, thermal (cavities for micelles 2-6 nm) and quantum (0.2-0.3 nm) fluctuations of water appear in the zone of concentration of micelle formation. Their energy is approximately equal to the H-bond. Contraction (expansion) of water H-bonds network of due to quantum fluctuations on a small scale correlates with the expansion (contraction) of the in the cavities in the micelles H-bonds network due to thermal fluctuations on a large scale. This phenomenon is caused by SСES.

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“…Light with linear polarization has equal LCP and RCP components, and if the light passes through certain material with circular birefringence, that is, the refractive indices for the LCP and RCP light are different, the polarization angle of the output light will be rotated. This phenomenon has given birth to many useful applications, such as concentration determination and organic structure analysis . Traditional way to obtain optical rotation usually resorts to chiral materials or Faraday effect, but it is difficult to minimize such devices due to the weak rotation coefficient in the naturally available materials.…”

Section: Optical Rotationmentioning

confidence: 99%

Geometric Metasurfaces for Ultrathin Optical Devices

Wen

Yue

Liu

et al. 2018

Advanced Optical Materials

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occurring materials, it is difficult to further reduce the thickness of optical elements based on such a design theory. [1] Metamaterials are artificially structured materials which attain their properties from the unit structures rather than the constituent materials, [2] so their optical properties such as the effective electric permittivity and the magnetic permeability can be tuned accordingly. [3] To overcome the fabrication difficulties of metamaterials working in the optical range, a 2D metamaterial, or metasurface has been developed, which consists of a layer of optical antennas to locally modify the phase, amplitude, and polarization of the scattered light. [1b,4] Optical antennas are typically made of metals or high refractive index dielectrics, which can be fabricated through standard nanofabrication process, such as electron beam lithography, liftoff process, focused ion beam milling, or reactive ion etching, thus the complexity of the fabrication is greatly reduced in comparison with that for their 3D counterparts. Besides, metasurfaces can change the properties of the scattered light by using antennas with a dimension smaller than the operating wavelength, which exhibits high resolution and can avoid the higher diffraction orders of the traditional diffractive optical devices. In addition, the thickness of the metasurface is much smaller than the incident wavelength which makes them practical for device miniaturization and system integration.Metasurfaces are generally divided into two categories based on their mechanisms: [1a] the one based on the dispersion of antenna resonance and the one based on the Pancharatnam-Berry phase, namely, geometric phase. [5] The former relies on the delicate design of antenna geometry to obtain the desired phase delay of the scattered light. For example, the V-shaped antennas with various arm lengths and opening angles can provide phase gradient to the cross-polarized light, which verifies the generalized laws of reflection and refraction. [6] In contrast, the latter usually contains antennas with the same structure but spatially variant orientations. [7] Each antenna can be regarded as an anisotropic scatterer, which converts part of the incident circularly polarized (CP) light to its opposite helicity with a geometric phase ± 2ψ. The symbol ψ represents the orientation angle of the antenna, with + sign for the conversion from left-handed circularly polarized (LCP) light to righthanded circularly polarized (RCP) light, and the − sign for RCP to LCP light. Thus, a sampled phase function can be imparted to the scattered light from an array of antennas with designed Metasurfaces, planar metamaterials consisting of a single layer or several layers of artificial structures, not only form the basis for fundamental physics research but also have considerable technological significance. Metasurfaces can locally modify the optical property within a subwavelength range, which can facilitate device miniaturization and system integration. Metasurfaces have shown extraordin...

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One More Extreme near the Critical Micelle Concentration: Optical Activity

Cited by 22 publications

References 8 publications

Giant optical activity of sugar in thin soap films

Giant optical activity of sugar in thin soap films

Strongly Correlated Electronic States in Aqueous Micellar Surfactant

Geometric Metasurfaces for Ultrathin Optical Devices

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