Surface tension anisotropy in the mechanics of ellipsoidal micelles

Kuznetsov, V. S.; Blinov, A. P.; Усольцева, Н. В.; Anan'eva, G. A.

doi:10.1134/s1061933x07050134

Cited by 8 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is noteworthy that discoidal micelles have been reported in surfactants and block copolymer systems. In surfactant solutions, ellipsoidal shape of a micelle is also intermediate between spherical and cylindrical shapes. , Oblate ellipsoids prove to be thermodynamically favored over prolate ellipsoids for most micelles . In this study the oblate micelles are also intermediate between spherical and cylindrical shapes.…”

Section: Resultsmentioning

confidence: 57%

Bump-Surface Multicompartment Micelles from a Linear ABC Triblock Copolymer: A Combination Study by Experiment and Computer Simulation

Jiang

2009

J. Phys. Chem. B

View full text Add to dashboard Cite

Novel bump-surface multicompartment micelles formed by a linear amphiphilic ABC triblock copolymer via self-assembly in selective solvent were successfully observed both in simulation and experiment. The results revealed that the block A forms the most inner core, and the blocks B and C form the inner and outer layers, respectively, and the bumps were formed by block A and more likely to be born on curving surfaces. Moreover, the micelle shape could be controlled by changing the solvent selectivity of the blocks A and B. Spherical, cylindrical, and discoidal micelles with bumpy surfaces were obtained both in experiment and simulation.

show abstract

Section: Resultsmentioning

confidence: 57%

Bump-Surface Multicompartment Micelles from a Linear ABC Triblock Copolymer: A Combination Study by Experiment and Computer Simulation

Jiang

2009

J. Phys. Chem. B

View full text Add to dashboard Cite

show abstract

“…It is likely that the architecture of the coat is weaker to crack growth around the equatorial direction than in the axial direction, perhaps due to thinner protein layers at the equator or to anisotropic strengthening of the underlying cell wall by helical glycan strands ( 20 ). The exact dimensions of a coat can be used to evaluate its surface tension in different directions: for a thin-walled ellipsoidal pressure vessel containing an internal turgor pressure, Kuznetsov derived a model for the anisotropic surface tension ( 21 ). For an aspect ratio b / a , it was found that the surface tension anisotropy in the structure was as follows:

where γ y is the surface tension in the direction around the equator of the shell, and γ x ( θ = π /2) is the surface tension at the equator in the direction parallel to its long axis.…”

Section: Discussionmentioning

confidence: 99%

Ellipsoid Localization Microscopy Infers the Size and Order of Protein Layers in Bacillus Spore Coats

Manetsberger

Manton

Erdélyi

et al. 2015

Biophysical Journal

View full text Add to dashboard Cite

Multilayered protein coats are crucial to the dormancy, robustness, and germination of bacterial spores. In Bacillus subtilis spores, the coat contains over 70 distinct proteins. Identifying which proteins reside in each layer may provide insight into their distinct functions. We present image analysis methods that determine the order and geometry of concentric protein layers by fitting a model description for a spheroidal fluorescent shell image to optical micrographs of spores incorporating fluorescent fusion proteins. The radius of a spherical protein shell can be determined with <10 nm error by fitting an equation to widefield fluorescence micrographs. Ellipsoidal shell axes can be fitted with comparable precision. The layer orders inferred for B. subtilis and B. megaterium are consistent with measurements in the literature. The aspect ratio of elongated spores and the tendency of some proteins to localize near their poles can be quantified, enabling measurement of structural anisotropy.

show abstract

“…Приводимые в литературе оценки МН для сферических мицелл, как ионных, так и НПАВ мало различаются и колеблются от 30 до 50 мДж/м 2 [6,7,[10][11][12][13]; при этом не прослеживаются какие-либо закономерности изменения МН в ГР. Теоретические модельные вычисления размерных эффектов МН и других термодинамических свойств наночастиц с искривленными поверхностями приводят к неоднозначным результатам даже для простейших систем [14].…”

Section: Introductionunclassified

Structural and Thermodynamic Properties of the Interfacial Area of Non-Ionic Micelles in Solutions of Ethoxylated Alkylpolyethers

Kuznetsov¹,

Усольцева²,

Zherdev³

et al. 2017

Liq. Cryst. and their Appl.

Self Cite

View full text Add to dashboard Cite

2 Ивановский государственный политехнический университет ул. 8 Марта, 20, 153037 Иваново, Россия Для сферических мицелл в растворах неионных поверхностно-активных веществ предлагается полуэмпирический метод вычисления межфазного натяжения. Метод основан на сопоставлении изменения размеров ядер мицелл при переходе от одного гомолога к другому, использовании экспериментальных изотерм поверхностного натяжения растворов и соответствующего уравнения Лапласа. Размеры ядер мицелл, межфазного слоя и других структурных параметров вычисляются исходя из концепции гидрофильно-липофильного баланса. Метод применен к мицеллам двух гомологических рядов этоксилированных полиэфиров -алкилэфиров тетраэтиленгликоля C m E 4 H и гексиловых эфиров полиэтиленгликоля C 6 E m H. Показано, что два изучаемых гомологических ряда C m E 4 H и C 6 E m H различно аранжированы относительно размеров ядер мицелл, критических концентраций мицеллообразования, чисел агрегации и межфазных натяжений. Размерные зависимости последних в гомологических рядах имеют асимптотический характер. Ключевые слова: полуэмпирический метод, сферические мицеллы, этоксилированные полиэфиры, межфазное натяжение, уравнение Лапласа, гидрофильно-липофильный баланс, числа агрегации.For spherical micelles in solutions of nonionic surface-active substances, a semiempirical method for calculating interfacial tension is proposed. The method is based on the comparison of the change in the size of micelle nuclei to a transition from one homologue to another, the use of the experimental isotherms of the surface tension of solutions and the corresponding Laplace equation. Dimensions of micelles nuclei, interphase layer and other structural parameters are calculated based on the concept of hydrophilic-lipophilic balance. The method is applied to micelles of two homologous series of ethoxylated polyethers -alkyl ethers of tetraethylene glycol C m E 4 H and hexyl esters of polyethylene glycol C 6 E m H. It is shown that the studied homologous series C m E 4 H and C 6 E m H are differently arranged with respect to the sizes of the micelles nuclei, critical micellar concentrations, aggregation numbers and interfacial tension. The dimensional dependences of the last in homological series have an asymptotic character.

show abstract

Surface tension anisotropy in the mechanics of ellipsoidal micelles

Cited by 8 publications

References 5 publications

Bump-Surface Multicompartment Micelles from a Linear ABC Triblock Copolymer: A Combination Study by Experiment and Computer Simulation

Bump-Surface Multicompartment Micelles from a Linear ABC Triblock Copolymer: A Combination Study by Experiment and Computer Simulation

Ellipsoid Localization Microscopy Infers the Size and Order of Protein Layers in Bacillus Spore Coats

Structural and Thermodynamic Properties of the Interfacial Area of Non-Ionic Micelles in Solutions of Ethoxylated Alkylpolyethers

Contact Info

Product

Resources

About