Sunday, July 30, 2006


Thermal stress evolution in embedded Cu/low-k dielectric composite features

With the scaling down in integration circuitry, device reliability attracts more and more attention of researchers. Among the key factors that influence the reliability, thermal stress distribution depends on both material properties and geometry of such systems.

Monday, July 24, 2006


Material challenge for flexible organic devices

This article highlighted two major technical challenges that are common to most flexible electronic technologies. Apparently, both of them are relevant with mechanics issues.

Friday, July 21, 2006


Towards frictionless nanomachines

Friction is a big problem in nanosized devices because they have huge surface-to-volume ratios, which means that their surfaces quickly wear out and seize up. Traditional lubricants are useless in such machines ... Two independent groups of researchers have taken improtant steps in overcoming friction in nanosized mechanical devices ... Highlighted by physicsweb, IOP.


Materials science: Carbon sheet solutions

(Nature 442, 254-255)

The graphene sheets can be used instead of carbon fires and nanotube. But these have a poor mechanical properties. This problem could be solved by making a composite material of graphene sheets and polymers although it is difficult to make. One of solutions is proposed by Stankovich et al (Nature 442, 282-286).

Friday, July 14, 2006


NANOTECHNOLOGY: Pretty as You Please, Curling Films Turn Themselves Into Nanodevices

One of difficulties in nanotechnology is how to make the structure which you want to. Roughly speaking, most of nano structure is 2D, but if you can control the shape, there are a plent of application.

Thursday, July 13, 2006


Soft matter with hard skin

A review ariticle on wrinkling by Jan Genzer and Jan Groenewold. The authors start with a general discussion of human skin wrinkles, which is probably the most common and the most important wrinkles. The simple mechanics of buckling is reviewed, togethter with recent experiments on elastic and viscoelastic foundations as well as some applications. A total of 87 references are cited, some of which look very interesting for further studies of wrinkling phenomena.

Wednesday, July 12, 2006


Applied Mechanics News: Cellular and Molecular Mechanics

by Philip LeDuc, Department of Mechanical Engineering, Carnegie Mellon University.

Monday, July 10, 2006


Testing System Analyzes Materials at the Micro to Nano Level

It is known universally that material often behaves differently in the micro- or nano scale than in the macroscopic world. New testing methods are demanded consequently. This is a brief introduction for one new testing method: NanoDAC. I think it is interesting and will keep tracking in it to get more details.

Sunday, July 09, 2006


Adding defects to CNT walls

Here is a report on a new method to add defects to carbon nanotube walls that was developed by researchers at the U.S. Department of Energy's Argonne National Laboratory.
The team found the method of adding defects to nanotubes by computer simulation tools.
This could be an improvement for the strong nanotube structure.

Friday, July 07, 2006


Thin Film Wrinkling in Metrology

Measuring the Modulus of Soft Polymer Networks via a Buckling-Based Metrology (Wilder et al., Macromolecules 39, 10.1021/ma060266b, 2006).

Highlighted in Science Magazine: Buckle Up for Softy

NIST News: Soft Materials Buckle Up for Measurement

A group of NIST Scientisits apply wrinkling pheonomenon to measure mechanical properties of soft materials, based on the mechanics of thin film buckling. They have also applied this method to ultrathin polymer films (less than 30 nm thick), in which case the mechanics is slightly modified to take into account the surface effects. Dr. Huang collaborated with this group on another paper, Elastic Moduli of Ultrathin Amorphous Polymer Films (Macromolecules 39, 10.1021/ma060790i, 2006). Many interesting mechanics questions remain open for the wrinkling phenomenon, and its potential applications (including nanometrology) are yet to be explored. A harmonic collaboration between experimentalists and theoreticians (mechanicians, in particular) is essential.

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