iMechanica - graphite
https://imechanica.org/taxonomy/term/672
enCracks found at reactor at Hunterston B nuclear power station
https://imechanica.org/node/17297
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/7634">nuclear materials</a></div><div class="field-item odd"><a href="/taxonomy/term/2435">nuclear energy</a></div><div class="field-item even"><a href="/taxonomy/term/5726">stochastic FE analysis</a></div><div class="field-item odd"><a href="/taxonomy/term/7740">Monte Carlo Method</a></div><div class="field-item even"><a href="/taxonomy/term/672">graphite</a></div><div class="field-item odd"><a href="/taxonomy/term/4702">HPC</a></div><div class="field-item even"><a href="/taxonomy/term/2394">parallel computing</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Perhaps some of those on this site have seen the news article on the <a href="http://www.bbc.com/news/uk-scotland-glasgow-west-29502329" target="_blank">BBC website</a> yesterday about cracks appearing in the reactor at the Hunterston B nuclear power station. As the article states, cracking in the graphite bricks is predicted and the regulators are happy that the reactor is safe to operate.</p>
<p>We've been doing some research at Manchester looking into whether tiny spatial variations in material properties need to be taken into account when carrying out predictive computer modelling of nuclear graphite reactor bricks.</p>
<p>Two preliminary conference papers can be downloaded at the links below. A more comprehensive journal paper is under review and I'll keep you posted as to whether that is accepted for publication.</p>
<p><a href="http://tinyurl.com/qzero67" target="_blank">Arregui et al. "Stochastic thermomechanical analysis of nuclear graphite using ParaFEM"</a></p>
<p><a href="http://tinyurl.com/mjlxtkb" target="_blank">Arregui et al. "Studies of the material of nuclear graphite with a random finite element approach"</a></p>
</div></div></div>Tue, 07 Oct 2014 08:15:37 +0000Lee Margetts17297 at https://imechanica.orghttps://imechanica.org/node/17297#commentshttps://imechanica.org/crss/node/17297Postdoc position at MIT available immediately
https://imechanica.org/node/9347
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/73">job</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/671">graphene</a></div><div class="field-item odd"><a href="/taxonomy/term/672">graphite</a></div><div class="field-item even"><a href="/taxonomy/term/871">postdoc</a></div><div class="field-item odd"><a href="/taxonomy/term/1284">Protein</a></div><div class="field-item even"><a href="/taxonomy/term/3950">soft materials</a></div><div class="field-item odd"><a href="/taxonomy/term/4469">Thermal Properties</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>We have several open postdoc positions, to be filled immediately.</p>
<p>The first project is focused on thermal management. The project involves the computational and theoretical analysis of graphene/graphite-metal nanocomposites and experimental work carried out by other team members. We are looking for a strong person with background in thermal and mechanical properties of materials, preferrably with background in molecular simulation.</p>
<p>For the other projects we are looking for candidates with expertise in mechanics of materials. Our projects are specifically focused on molecular and coarse-grain modeling of deformation and failure of soft biological materials and include a focus on collagen, spider silk, amyloid materials and other biomaterials.</p>
<p>More details will be provided to interested candidates.</p>
<p>Please send a CV, a brief summary of research interests and skills, several representative publications, and the names, affiliations, phone numbers, and email addresses of three references to <a href="mailto:lamm-search@MIT.EDU">lamm-search@MIT.EDU</a>. The research will be carried out at MIT’s Laboratory for Atomistic and Molecular Mechanics.</p>
<p>Evaluation of candidates will begin immediately and will continue until the opening is filled. This position is available immediately.</p>
<p>For any questions, please contact Markus Buehler at <a href="mailto:mbuehler@MIT.EDU">mbuehler@MIT.EDU</a> (contact information below).</p>
<p>Contact information:</p>
<p>
Prof. Markus J. Buehler, Ph.D.<br />
Esther and Harold E. Edgerton Associate Professor<br />
Principal Investigator, Laboratory for Atomistic and Molecular Mechanics<br />
Department of Civil and Environmental Engineering<br />
Center for Materials Science and Engineering<br />
Center for Computational Engineering<br />
Massachusetts Institute of Technology<br />
77 Massachusetts Ave. Room 1-235 A&B<br />
Cambridge MA 02139<br />
Phone: 617-452-2750<br />
Fax: 617-324-4014<br />
E-mail: <a href="mailto:mbuehler@MIT.EDU">mbuehler@MIT.EDU</a><br />
Lab website: <a href="http://web.mit.edu/mbuehler/www/">http://web.mit.edu/mbuehler/www/</a>
</p>
</div></div></div>Sat, 20 Nov 2010 15:24:16 +0000Markus J. Buehler9347 at https://imechanica.orghttps://imechanica.org/node/9347#commentshttps://imechanica.org/crss/node/9347Micromechanical Exfoliation and Graphene: 1999 papers and brief discussion of them
https://imechanica.org/node/963
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/18">micromechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/671">graphene</a></div><div class="field-item even"><a href="/taxonomy/term/672">graphite</a></div><div class="field-item odd"><a href="/taxonomy/term/673">cleavage</a></div><div class="field-item even"><a href="/taxonomy/term/674">citing the existing literature</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>The discovery of a new material type, graphene and extremely thin platelets of graphite, was discussed in several articles from my research group published in 1999:</p>
<p>Lu XK, Huang H, Nemchuk N, and Ruoff RS, <em>Patterning of highly oriented pyrolytic graphite by oxygen plasma etching, </em>APPLIED PHYSICS LETTERS, <strong>75</strong>, 193-195 (1999).</p>
<p>Lu XK, Yu MF, Huang H, and Ruoff RS, <em>Tailoring graphite with the goal of achieving single sheets, </em>NANOTECHNOLOGY, <strong>10</strong>, 269-272 (1999). </p>
<p>These are downloadable on <a href="http://bucky-central.mech.northwestern.edu/publications.html">http://bucky-central.mech.northwestern.edu/publications.html</a></p>
<p>As #81 and #82. </p>
<p>The Conclusion of the article in NANOTECHNOLOGY states: </p>
<p><strong>"4. Conclusions</strong></p>
<p align="left">The results of the study show that graphite islands of</p>
<p align="left">micrometre size can be fabricated on the HOPG surface in</p>
<p align="left">a designed way. The islands can be further manipulated by</p>
<p>an AFM tip either <em>in situ </em>as-created on the HOPG surface,<br /></p><p align="left">or as-transferred on any other flat surfaces, such as a Si(001)</p>
<p align="left">surface. Very thin sections of HOPG plates were found on</p>
<p align="left">the substrate to which the islands were transferred. The</p>
<p align="left">results have the implication that, by using nanofabrication</p>
<p align="left">techniques, single or multiple atomic layers of graphite sheets</p>
<p align="left">can be fabricated in any desired shape. These graphite</p>
<p align="left">sheets are suitable to be used as building elements for</p>
<p align="left">new nanostructral materials and nanodevices. Micrometreor</p>
<p align="left">nanometre-sized graphene sheets can, in principle, be</p>
<p align="left">obtained from the graphite islands created from HOPG,</p>
<p align="left">within the size range of current nanofabrication techniques.</p>
<p align="left">Futurework will include trying to obtain graphene rather than</p>
<p align="left">multiple-layer thick pieces of graphite, and to understand the</p>
<p align="left">physical and chemical properties of graphene and few-layer</p>
<p align="left">thick pieces of graphite."</p>
<p align="left"> Philip Kim's group at Columbia University then used a tipless AFM Cantilever to cleave such pillars of graphite, citing our work. I thought this a rather clever approach. While it is seen from the above statement and these two articles that significant work related to preparing graphene had been published in 1999, perhaps not all researchers are aware of this early work, given the recent flurry of activity using related methods of microexfoliation, such as peeling with an adhesive tape followed by rubbing on a Silicon wafer. The purpose of this posting is to bring this work to the attention of the mechanics community and to point out that advances in micro-exfoliation (removing the human hands from the effort?) might be useful research directions for preparing more controllably, thin platelets of graphite. </p>
<p align="left"> -Rod Ruoff</p>
</div></div></div>Sat, 03 Mar 2007 14:38:09 +0000Rod Ruoff963 at https://imechanica.orghttps://imechanica.org/node/963#commentshttps://imechanica.org/crss/node/963Error | iMechanica