Surface Forces and Nanorheology of Molecularly Thin Films

Ruths, Marina; Israelachvili, Jacob N.

doi:10.1007/978-3-319-51433-8_9

Cited by 10 publications

(2 citation statements)

References 196 publications

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“…S imple or complex fluids can display very different rheological properties under nanometric confinement or in the vicinity of surfaces, compared to the bulk one. 1 Several nanorheological tools 2 have been developed to capture both static and dynamics of confined liquids, such as an atomic force microscope (AFM), 3 surface forces apparatus (SFA), 4 and motion tracking of fluorescent fluid 5 or nanoparticles. 6 These experiments have improved the fundamental comprehension of the rheological behavior of fluids in conditions where at least one dimension approaches the molecular size.…”

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Nanorheology with a Conventional Rheometer: Probing the Interfacial Properties in Compatibilized Multinanolayer Polymer Films

et al. 2019

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Measuring the viscoelastic behavior of polymers in the vicinity of a surface or under confinement is an experimental challenge. Simple rheological tests of nanolayered films of polyethylene/ polyamide 6 compatibilized in situ during the coextrusion process enabled the probing of these interfacial properties. Taking advantage of the different melting points and of the multiplication of the number of interfaces, a drastic increase of dynamic moduli was reported when increasing the interphase volume fraction in the films. A solid-like behavior for the interphase was identified. The complex viscosity of nanolayered films as a function of angular frequency was quantitatively captured for all samples using a weighted mixing law of bulk and interphase viscosities, without additional adjusting parameters, highlighting the interfacial synergy developed in nanolayered polymer films.

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confidence: 99%

Nanorheology with a Conventional Rheometer: Probing the Interfacial Properties in Compatibilized Multinanolayer Polymer Films

et al. 2019

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“…This is based on the fact that, when the temperature of the system is raised, energy is effectively added, which gives the molecules of the liquid the required energy to overcome the intermolecular force. Due to this, the molecules further move apart, and this leads to a decrease in the viscosity of the liquid [ 24 ]. This happened with the tamarind seed polymer (TSP) solution.…”

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Determination of Temperature-Dependent Coefficients of Viscosity and Surface Tension of Tamarind Seeds (Tamarindus indica L.) Polymer

et al. 2021

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The rheological properties of tamarind seed polymer are characterized for its possible commercialization in the food and pharmaceutical industry. Seed polymer was extracted using water as a solvent and ethyl alcohol as a precipitating agent. The temperature’s effect on the rheological behavior of the polymeric solution was studied. In addition to this, the temperature coefficient, viscosity, surface tension, activation energy, Gibbs free energy, Reynolds number, and entropy of fusion were calculated by using the Arrhenius, Gibbs–Helmholtz, Frenkel–Eyring, and Eotvos equations, respectively. The activation energy of the gum was found to be 20.46 ± 1.06 kJ/mol. Changes in entropy and enthalpy were found to be 23.66 ± 0.97 and −0.10 ± 0.01 kJ/mol, respectively. The calculated amount of entropy of fusion was found to be 0.88 kJ/mol. A considerable decrease in apparent viscosity and surface tension was produced when the temperature was raised. The present study concludes that the tamarind seed polymer solution is less sensitive to temperature change in comparison to Albzia lebbac gum, Ficus glumosa gum and A. marcocarpa gum. This study also concludes that the attainment of the transition state of viscous flow for tamarind seed gum is accompanied by bond breaking. The excellent physicochemical properties of tamarind seed polymers make them promising excipients for future drug formulation and make their application in the food and cosmetics industry possible.

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Guest editorial: Special issue on science of friction

Meng

Popov

2015

Friction

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Friction causes wear and energy dissipation of all moving parts under various operating conditions and environments. Approximately one third of the world's primary energy consumption is attributed to friction. Friction, as a decisive factor of energy efficiency, attracts vital interest of scientists and engineers trying to understand its origin and develop means to control friction through predictive models. Therefore, understanding the fundamental origins and mechanisms of friction is one of the great challenges in tribology.This Special Issue of Friction is intended to report recent research progress in the basic science of friction, covering not only the fundamental mechanisms of friction at the atomic-scale, including experiments and simulations but also its industrial applications. Review papers, research articles and a short communication are included to demonstrate the breadth, importance and timeliness of the subject and to anticipate future developments. Six papers by tribologists and scientists having expertise in material science, physics and chemistry have been invited to pursue these aims. The contributions include two review articles on the effect of vapor adsorption on the tribological behaviors of different classes of materials and on the boundary lubrication by adsorption film, one research paper on the effects of the rate and solvation on friction and adhesion hysteresis between polymer brushes attached to curved surfaces, one paper on the micro scale study of frictional properties of graphene in ultra high vacuum, one on energy dissipation of atomic-scale friction based on onedimensional Prandtl−Tomlinson model and one short communication on the research works of Coulomb and Amontons and generalized laws of friction.The first paper by Alazizi, Barthel, Surdyka, Luo, and Kim offers a comprehensive review of the effect of environment on friction and wear behavior of different classes of materials and potential applications of these effects for engineering problems. Covered are the influences of water and organic vapors on the friction of a wide range of materials including metals, glasses, ceramics, polymers, and carbon materials. The effect of surface roughness on lubrication with adsorbed vapor is highlighted as an important aspect of engineered surfaces that can be lubricated with adsorbed vapors. Furthermore, the utilization of adsorbed vapor as lubricants for miniature devices and as precursor for in situ synthesis of polymeric lubricants is thoroughly discussed.Zhang and Meng review the development in the field of boundary lubrication by an adsorbed film and highlight historical breakthroughs in uncovering the mysterious but extremely useful process of boundary lubrication. This review focuses on the formation of a boundary film, the effects of the boundary film on the adhesion of rough surfaces, the behavior of an adsorption film in boundary lubrication and the boundary lubrication at the nanoscale. Especially, the methods of control of boundary lubrication are discussed exhaustively for ...

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Surface Forces and Nanorheology of Molecularly Thin Films

Cited by 10 publications

References 196 publications

Nanorheology with a Conventional Rheometer: Probing the Interfacial Properties in Compatibilized Multinanolayer Polymer Films

Nanorheology with a Conventional Rheometer: Probing the Interfacial Properties in Compatibilized Multinanolayer Polymer Films

Determination of Temperature-Dependent Coefficients of Viscosity and Surface Tension of Tamarind Seeds (Tamarindus indica L.) Polymer

Guest editorial: Special issue on science of friction

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