adhesion

Hello everyone,

One of the papers from the 'past' (but still quite actual...I think) and maybe of some interest to various communities. 

Abstract:

A system in which one adherend had two types of surface treatment was tested using a wedge test.

Simple polishing and polishing with subsequent sandblasting were the

treatments used, with a distinct straight line, perpendicular to the sample edges,

separating the two. Despite the clear-cut difference in surface treatment, smooth

Two postdoctoral positions are available in the group of Prof. M. Urbakh in lively Tel-Aviv. Topics are centered around nano and micro-scale tribology (friction, dissipation, adhesion, wear) involving theory, modeling, and computer simulation of frictional and nonlinear
dissipation phenomena.

Adhesion has long been an important issue for mechanics and
many other disciplines. Its influence spans macro-, micro-, nano- and molecular
scales. When size goes down, adhesion plays a more and more significant role.
Many important technologies attribute to adhesion, such as transfer printing
for advanced microfabrication, super adhesives inspired by gecko foot hairs,
and self-assembly. Adhesion also has strong implications on the behavior of
nanomaterials (such as nanotubes and graphenes) and biological systems (such as
cells). This minisymposium "Mechanics of Adhesion" is to provide a

Understanding the adhesion between graphene and other materials is crucial for achieving more reliable graphene-based applications in electronic devices and nanocomposites. The ultra-thin profile of graphene, however, poses significant challenge to direct measurement of its adhesion property using conventional approaches. We show that there is a strong correlation between the morphology of graphene on a compliant substrate with patterned surface and the graphene-substrate adhesion.

Adhesion has long been an important issue for mechanics and many other disciplines. Its influence spans macro-, micro-, nano- and molecular scales. When size goes down, adhesion plays a more and more significant role. Many important technologies attribute to adhesion, such as transfer printing for advanced microfabrication,  super adhesives inspired by gecko foot hairs, and self-assembly. Adhesion also has strong implications on the behavior of nanomaterials (such as nanotubes and graphenes) and biological system (such as cells).

I would like to bring your attention to the Gordon Research Conference (GRC) on Adhesion Science, which will be held from July 24 – 29, 2011, at Bates College, Lewiston, Maine, U.S.A.  This conference is chaired by Chung-Yuen Hui at Cornell University and Kenneth Shull at Northwestern University.

Constitutive relations, 2-D vs. 3-D. The starting point for modeling cellular membranes is the constitutive relations in 2-D space. It is important to set up the corresponding equations directly in two dimensions rather than to consider them as an asymptotic limit of three-dimensional relationships, like it is done in the shell theory. The main reason for the direct 2-D relations is that 3-D continuum approaches are not applicable to membranes whose thickness in on the order of magnitude of the dimension of a single molecule.

The Graduate School MUSIC (Multiscale Methods for Interface Coupling) invites to its first Summer School on Multiscale and Multiphysics Modelling of Interfaces at Leibniz Universitaet Hannover, Germany, from 15 to 17 September 2010.

Welcome to February 2010 Journal Club!  This month, I look forward to a lively discussion on the mechanics of structured and patterned interfaces in which geometry is used to tailor adhesion.  Much of the work in this area has been inspired by a variety of animals and insects that have feet covered with small structures (often hierarchical and sub-micrometer in size at the end) that allow them to strongly adhere to a broad range of surfaces.  The best known example is the Tokay Gecko (Gekko gecko), which can achieve an adhesion force much greater than its body weight and can quickl

Location:  Colby-Sawyer College, New London, NH, United States
Sunday, July 26, 2009 - Friday, July 31, 2009
Chair:  Jeffrey T Koberstein (Columbia University)
Vice Chair:  Chung-Yuen Hui (Cornell University)
Web Site:  http://www.grc.org/programs.aspx?year=2009&program=adhesion

Online Application:  http://www.grc.org/application.aspx?id=13784

The Adhesion Society will hold its 32nd Annual Meeting in Savannah, GA February 15-18, 2009; uniting chemists, physicists, mechanists, engineers, and biologists concerned with the design and characterization of materials interfaces and their associated property of adhesion.  Adhesion and interfacial constrol are key to the development of nano- and bio- based technologies as well structural and cosmetic applications that influence society in everyday life. 

A Post-Doc Position is avalaible in Bio-Mimetic Adhesive Interfaces (EbioAdI) at the University of Mons-Hanaut, Belgium

Supervisor: Prof. Pascal Damman, PhD
University of Mons-Hainaut
Interfaces & Complex Fluids Lab (InFluX)
European Collaborative Research Project (ESF-Eurocores)
Duration : 1 – 3 years
Deadline: 1 September 20088

In short:

Please note that a post-doc position on stresses and adhesion in optical multilayers is open. The position is for 2-years shared between SVI (Paris) and Phymat (Poitiers).

Link to a virus-free MS Word description of the position:

http://www.saint-gobain-recherche.com/svi/en/image_merethif_position.html

For further details and applications (cover letter, CV, statement of research interests):

A post-doc position on multiscale simulation of cell contact and adhesion shall be available this coming Fall at UC Berkeley. We are seeking for a person who has experience and background on finite element computations, especially in cell contact/adhesion modeling and simulation or finite deformation simulations.

Anyone who is interested in the position please send an email, resume, and reference to li@ce.berkeley.edu

Yesterday I had the distinct pleasure of seeing a mechanics seminar delivered "tag-team" by Ken Johnson and Jim Greenwood. (I know several people have thought I was a bit mad for jumping "across the pond" but there are really some amazing benefits of being part of the Cambridge Engineering faculty!)

A systematic characterization of the motion and friction of a linear bearing with rolling elements used for nanopositioning reveals an explicit distinction of static and rolling friction. The effects

As I promised, I start with some brief notes on themes loved by Ken Johnson to hopefully raise some interest for discussion on iMechanica. Regards, Mike

Ting Y. Tsui, Andrew J. McKerrow, and Joost J. Vlassak

Published in the Journal of The Mechanics and Physics of Solids, 54 (5), 887-903 (2006)

Abstract – Organosilicate glass (OSG) is a material that is used as a dielectric in advanced integrated circuits. It has a network structure similar to that of amorphous silica where a fraction of the Si-O bonds has been replaced by organic groups. It is well known from prior work that OSG is sensitive to subcritical crack growth as water molecules in the environment are transported to the crack tip and assist in rupturing Si-O bonds at the crack tip. In this study, we demonstrate that exposure of an OSG containing film stack to water prior to fracture results in degradation of the adhesion of the film stack. This degradation is the result of the diffusion of water into the film stack. We propose a quantitative model to predict adhesion degradation as a function of exposure time by coupling the results of independent subcritical crack growth measurements with diffusion concentration profiles. The model agrees well with experimental data and provides a novel method for measuring the water diffusion coefficient in film stacks that contain OSG. This study has important implications for the reliability of advanced integrated circuits.