Micelle Stabilization via Entropic Repulsion: Balance of Force Directionality and Geometric Packing of Subunit

2015 ◽  
Vol 16 (3) ◽  
pp. 743-747 ◽  
Author(s):  
He Dong ◽  
Reidar Lund ◽  
Ting Xu
Keyword(s):  
Entropic Repulsion ◽  
Geometric Packing

scholarly journals Geometric Packing under Nonuniform Constraints

2017 ◽  
Vol 46 (6) ◽  
pp. 1745-1784
Author(s):  
Alina Ene ◽  
Sariel Har-Peled ◽  
Benjamin Raichel
Keyword(s):  
Geometric Packing

scholarly journals Lateral pressure profile in bent lipid membranes and mechanosensitive channels gating

2016 ◽  
Author(s):  
Anna A. Drozdova ◽  
Sergei I. Mukhin
Keyword(s):  
Pressure Distribution ◽  
Lipid Bilayer ◽  
Lateral Pressure ◽  
Small Deviation ◽  
Finite Thickness ◽  
Analytical Calculation ◽  
Pressure Profile ◽  
Entropic Repulsion ◽  
Bending Modulus ◽  
Lateral Pressure Profile

AbstractThis review describes the analytical calculation of lateral pressure profile in the hydrophobic part of the lipid bilayer with finite curvature based on previously developed microscopic model for lipid hydrocarbon chains. According to this theory the energy per unit chain is represented as energy of flexible string (Euler’s elastic beam of finite thickness) and interaction between chains is considered as an entropic repulsion. This microscopic theory allows to obtain expression for lateral pressure distribution in bent bilayer if treating a bending as a small deviation from the flat membrane conformation and using perturbation theory. Because lateral pressure distribution is related to elastic properties of lipid bilayer then the first moment of lateral pressure and the expression for bending modulus may be derived from this theoretical model. Finally one can estimate the energy difference between two various conformational states of mechanosensitive channel embedded into the bilayer with pressure profile Пt(z).

scholarly journals Jeans Instability, Jeans Entropy and the Entropy Origin of Gravity

2021 ◽  
Author(s):  
Edward Bormashenko
Keyword(s):  
Thermal Equilibrium ◽  
Gravitational Force ◽  
Ideal Gas ◽  
The Self ◽  
Gravitational Attraction ◽  
Scaling Relation ◽  
Entropic Repulsion ◽  
Holographic Screen ◽  
Jeans Instability ◽  
Gravitational Compression

An entropic origin of gravity is re-visited. Isothermal self-gravitating cloud seen as an ideal gas is analyzed. Gravitational attraction within the isothermal cloud in equilibrium is balanced by the pressure, which is of a pure entropic nature. The notion of the Jeans entropy of the cloud corresponding to the entropy of the self-gravitating cloud in mechanical and thermal equilibrium is introduced. Balance of the gravitational compression and the entropic repulsion yields the scaling relation hinting to the entropic origin of the gravitational force. The analysis of the Jeans instability enables elimination of the “holographic screen” or “holographic principle” necessary for grounding of the entropic origin of gravity.

scholarly journals Entropic repulsion on a rarefied wall

2003 ◽  
Vol DMTCS Proceedings vol. AC,... (Proceedings) ◽  
Author(s):  
L. R. G. Fontes ◽  
M. Vachkovskaia ◽  
A. Yambartsev
Keyword(s):  
Random Walk ◽  
Entropic Repulsion ◽  
Random Surface ◽  
International Audience ◽  
The Mean ◽  
Number Of Visits

International audience We consider the motion of a discrete d-dimensional random surface interacting by exclusion with a rarefied wall. The dynamics is given by the serial harness process. We prove that the process delocalizes iff the mean number of visits to the set of sites where the wall is present by some random walk is infinite. In case where there is a delocalization, bounds on its speed are obtained.

Butyl rubber slurry formation: Cold-stage SEM study

1990 ◽  
Vol 48 (4) ◽  
pp. 880-881
Author(s):  
L. L. Ban ◽  
K. W. Powers ◽  
H-C Wang
Keyword(s):  
Block Copolymer ◽  
Aluminum Chloride ◽  
Methyl Chloride ◽  
Butyl Rubber ◽  
Polymerization Process ◽  
Electrostatic Repulsion ◽  
Entropic Repulsion ◽  
Cold Stage ◽  
Sem Study ◽  
Chloride Catalyst

Poly(isobutylene-co-isoprene) or butyl rubber was invented in 1937 and has been used in many technologically important applications during the ensuing years. Its physical properties such as air-retention encouraged its uses in tire inner tubes, and played an important part in the tubeless tire development. The halogenated derivative is now predominantly used in tubeless radial tires.Butyl rubber is made by a slurry polymerization process with aluminum chloride catalyst at -95°C in methyl chloride diluent. Typical reactor runs only last from 18-60 hours because of fouling of the reactor. Fouling and agglomeration occur because only weak electrostatic repulsion forces exist, but recent patents describe the use of block copolymer stabilizer agents which create steric (entropic) repulsion forces between slurry polymer particles and preventTo better understand the mechanism of reactor fouling, a method was developed to collect samples from within the reactor.

scholarly journals Interactions between amphoteric surfaces with strongly overlapping double layers

Soft Matter ◽  
2018 ◽  
Vol 14 (23) ◽  
pp. 4702-4710 ◽  
Author(s):  
Mark Vis ◽  
Remco Tuinier ◽  
Bonny W. M. Kuipers ◽  
Agienus Vrij ◽  
Albert P. Philipse
Keyword(s):  
Electric Field ◽  
Double Layers ◽  
Entropic Repulsion ◽  
Electrical Double Layers ◽  
Donnan Equilibrium

The entropic repulsion between strongly overlapping electrical double-layers from two parallel amphoteric plates is described via the Donnan equilibrium in the limit of zero electric field.

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