The kinetic friction coefficient of neutral and charged polymer brushes

Soft Matter ◽  
2013 ◽  
Vol 9 (10) ◽  
pp. 2966 ◽  
Author(s):  
Florent Goujon ◽  
Aziz Ghoufi ◽  
Patrice Malfreyt ◽  
Dominic J. Tildesley
Keyword(s):  
Friction Coefficient ◽  
Polymer Brushes ◽  
Kinetic Friction ◽  
Charged Polymer

Numerical Investigation of the Influence of Friction Coefficient on Brake Groan

2010 ◽  
Vol 44-47 ◽  
pp. 1923-1927 ◽  
Author(s):  
Xian Jie Meng
Keyword(s):  
Nonlinear Dynamics ◽  
Friction Coefficient ◽  
Degrees Of Freedom ◽  
Equilibrium Points ◽  
Static Friction ◽  
Kinetic Friction ◽  
Dynamics Model ◽  
Excited Vibration ◽  
Nonlinear Dynamics Model ◽  
The Stability

A two degrees of freedom nonlinear dynamics model of self-excited vibration induced by dry-friction of brake disk and pads is built firstly, the stability of vibration system at the equilibrium points is analyzed using the nonlinear dynamics theory. Finally the numerical method is taken to study the impacts of friction coefficient on brake groan. The calculation result shows that with the increase of kinetic friction coefficient /or the decrease of difference value between static friction coefficient and kinetic friction coefficient can prevent or restrain self-excited vibration from happening.

Binding of ionic surfactants to charged polymer brushes grafted onto porous substrates

2002 ◽  
Vol 954 (1-2) ◽  
pp. 89-97 ◽  
Author(s):  
Haruhiko Ogawa ◽  
Kazuyuki Sugita ◽  
Kyoichi Saito ◽  
Min Kim ◽  
Masao Tamada ◽  
...  
Keyword(s):  
Polymer Brushes ◽  
Ionic Surfactants ◽  
Charged Polymer ◽  
Porous Substrates

Dynamics of water, hydrated-ions and charged polymers in highly-confined films, and their role in friction modification

2003 ◽  
Vol 790 ◽  
Author(s):  
Jacob Klein ◽  
Uri Raviv ◽  
Susan Perkin ◽  
Nir Kampf ◽  
Suzanne Giasson
Keyword(s):  
Polymer Brushes ◽  
Aqueous Media ◽  
Free Water ◽  
Aqueous Salt Solution ◽  
Ball Bearings ◽  
High Concentration ◽  
Charged Surfaces ◽  
Hydrated Ions ◽  
Charged Polymer ◽  
The One

ABSTRACTRecent studies have revealed that, in contrast to non-associating liquids such as oils or organic solvents, salt-free water retains a viscosity close to its bulk value even when confined to films thinner than some 3 nm, indeed down to only one or two monolayers thick [1,2]. For the case of high concentration aqueous salt solution compressed down to subnanometer films between charged surfaces, the trapped hydrated ions serve to act as molecular ball-bearings, sustaining a large load while remaining very fluid under shear [3]. This behaviour is attributed to the tenacity of the hydration sheaths together with their rapid relaxation time. Finally, a very recent study [4] has shown that when charged polymer brushes in aqueous media are compressed and slid past each other, they provide a lubrication that is considerably superior to that afforded by neutral brushes: This is attributed on the one hand to the resistance to mutual interpenetration of the chains due to entropic barriers in the good-solvent conditions, and, on the other hand, to the hydration-sheaths on the charged polymer segments which can act – as noted above – as molecular ball-bearings.

Approaching charged polymer brushes

2011 ◽  
Author(s):  
Long Chen ◽  
Holger Merlitz ◽  
Su-zhen He ◽  
Chen-xu Wu ◽  
Jens-Uwe Sommer
Keyword(s):  
Polymer Brushes ◽  
Charged Polymer

Charged Polymer Brushes: Counterion Incorporation and Scaling Relations

1998 ◽  
Vol 81 (19) ◽  
pp. 4172-4175 ◽  
Author(s):  
Heiko Ahrens ◽  
Stephan Förster ◽  
Christiane A. Helm
Keyword(s):  
Polymer Brushes ◽  
Scaling Relations ◽  
Charged Polymer
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