Nanodroplets of Polymer Solutions on Solid Surfaces: Equilibrium Structures and Solvent Evaporation

2020 ◽  
Vol 53 (24) ◽  
pp. 10882-10897
Author(s):  
Vitaly S. Kravchenko ◽  
Igor I. Potemkin
Keyword(s):  
Polymer Solutions ◽  
Solvent Evaporation ◽  
Solid Surfaces ◽  
Equilibrium Structures

Stitching Chemically Converted Graphene on Solid Surfaces by Solvent Evaporation

2012 ◽  
Vol 4 (12) ◽  
pp. 6443-6449 ◽  
Author(s):  
Yufei Wang ◽  
Yuting Song ◽  
Satoshi Watanabe ◽  
Suojiang Zhang ◽  
Dan Li ◽  
...  
Keyword(s):  
Solvent Evaporation ◽  
Solid Surfaces ◽  
Chemically Converted Graphene

Lay Gold Nanorods Monolayer down on Solid Surfaces for Surface Enhanced Raman Spectroscopy Applications

2021 ◽  
Author(s):  
haidong Zhao ◽  
Katsuhiro Isozaki ◽  
Tomoya Taguchi ◽  
Shengchun Yang ◽  
Kazushi Miki
Keyword(s):  
Raman Spectroscopy ◽  
Gold Nanorods ◽  
Hybrid Method ◽  
Self Assembly ◽  
Surface Enhanced Raman Spectroscopy ◽  
Solid Substrate ◽  
Solvent Evaporation ◽  
Solid Surfaces ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Laying-down gold nanorods (GNRs) of a monolayer immobilized on a solid substrate was realized with the hybrid method, a combination of three elemental technologies: self-assembly, electrophoresis, and solvent evaporation. The...

scholarly journals Group Analysis of the Boundary Layer Equations in the Models of Polymer Solutions

Symmetry ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1084
Author(s):  
Sergey V. Meleshko ◽  
Vladislav V. Pukhnachev
Keyword(s):  
Boundary Layer ◽  
Polymer Solutions ◽  
Group Analysis ◽  
Stationary Problem ◽  
Solid Surfaces ◽  
Second Grade ◽  
Boundary Layer Equations ◽  
Aqueous Polymer ◽  
Longitudinal Coordinate ◽  
Grade Fluid

The famous Toms effect (1948) consists of a substantial increase of the critical Reynolds number when a small amount of soluble polymer is introduced into water. The most noticeable influence of polymer additives is manifested in the boundary layer near solid surfaces. The task includes the ratio of two characteristic length scales, one of which is the Prandtl scale, and the other is defined as the square root of the normalized coefficient of relaxation viscosity (Frolovskaya and Pukhnachev, 2018) and does not depend on the characteristics of the motion. In the limit case, when the ratio of these two scales tends to zero, the equations of the boundary layer are exactly integrated. One of the goals of the present paper is group analysis of the boundary layer equations in two mathematical models of the flow of aqueous polymer solutions: the second grade fluid (Rivlin and Ericksen, 1955) and the Pavlovskii model (1971). The equations of the plane non-stationary boundary layer in the Pavlovskii model are studied in more details. The equations contain an arbitrary function depending on the longitudinal coordinate and time. This function sets the pressure gradient of the external flow. The problem of group classification with respect to this function is analyzed. All functions for which there is an extension of the kernels of admitted Lie groups are found. Among the invariant solutions of the new model of the boundary layer, a special place is taken by the solution of the stationary problem of flow around a rectilinear plate.

Electrospinning of polymer solutions: An analysis of instability in a thinning jet with solvent evaporation

Polymer ◽  
2020 ◽  
Vol 202 ◽  
pp. 122656 ◽  
Author(s):  
Dharmansh Deshawar ◽  
Karan Gupta ◽  
Paresh Chokshi
Keyword(s):  
Polymer Solutions ◽  
Solvent Evaporation

Measurement and Modelling of Boundary Film Properties of Polymeric Lubricant Additives

1996 ◽  
Vol 210 (1) ◽  
pp. 1-15 ◽  
Author(s):  
G Guangteng ◽  
M Smeeth ◽  
P M Cann ◽  
H A Spikes
Keyword(s):  
Polymer Solutions ◽  
Control Volume ◽  
Point Contact ◽  
Solid Surfaces ◽  
Bulk Solution ◽  
Surface Layers ◽  
Film Properties ◽  
Volume Analysis ◽  
Boundary Film ◽  
20 Nm

Experimental work using ultrathin film interferometry has shown that some polymer solutions in oil form much thicker films at slow speeds in rolling, concentrated contacts than predicted from elastohydrodynamic (EHD) theory. This behaviour can be interpreted as resulting from the polymers forming adsorbed, surface layers of enhanced concentration on the two solid surfaces. Such layers, which are typically 20 nm thick, would be significantly more viscous that the bulk solution and thus produce thicker EHD films. This concept has been supported by modelling the elastohydrodynamic point contact using control volume analysis with a layered surface viscosity. The film thickness behaviour predicted computationally using this technique is quite similar to that found experimentally using polymer solutions.

Structuring of polymer solutions upon solvent evaporation

2015 ◽  
Vol 91 (2) ◽  
Author(s):  
C. Schaefer ◽  
P. van der Schoot ◽  
J. J. Michels
Keyword(s):  
Polymer Solutions ◽  
Solvent Evaporation
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