Navigation Links
Engineering nanoparticles for maximum strength
Date:10/20/2008

at that point.

These local strengths were combined to model the behavior of the whole sphere, a process called finite element analysis, or FEA. When simulated by a computer, the strain at each point in a sphere of specific dimensions, subjected to the applied compression, could be calculated and visualized. The simulations revealed that as displacement increased, the sphere's shape served to transfer stress to certain regions experiencing maximum shear regions corresponding to the top and bottom of the sphere where it contacted the substrate and the diamond anvil. This is where the spheres were usually observed to fail in the actual experiments. Indeed, the experimental results generally followed the predictions of the FEA model.

"The model incorporates the actual experimental conditions as well as possible," says Minor, "including the 'glue' we use to hold the nanosphere on the substrate. This is just a little of the carbonaceous material left over from the chemical process used to create the cadmium sulfide nanospheres. Originally we cleaned this away, but after we experienced a couple of instances of the spheres slipping away when they were squeezed, we stopped cleaning them so they would stay attached to the surface. The FEA model had to take this carbonaceous material into account."

The FEA model showed that the stresses within the FEA model at the point of fracture were indeed quite high. For example, a nanosphere 450 nanometers in diameter with a shell about 69 nanometers thick, deformed by compression to some eight percent of its original diameter, experiences local shear stresses approaching the ideal shear strength of cadmium sulfide. A 'fracture criterion,' derived by the researchers from their model, accurately predicts that a typical nanosphere experiences some 70 percent of the ideal shear strength at its point of failure.

"These are the most complete analyses of the mechanical properties of single nanoparticle
'/>"/>

Contact: Paul Preuss
paul_preuss@lbl.gov
510-486-6249
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

Page: 1 2 3 4

Related biology technology :

1. Genstruct Expands Team with New VP of Engineering
2. Genetic Engineering & Biotechnology News reports on growing role of molecular diagnostics
3. NSF awards 14 materials research science and engineering centers
4. Online Systems Engineering Master's Program Attracts Engineers from Fortune 500 Firms
5. American Oriental Bioengineering Announces Participation in September Investor Conferences
6. American Oriental Bioengineering, Inc. to Report Second Quarter 2008 Financial Results
7. Christopher Kurtz Joins Alexza Pharmaceuticals as Vice President, Global Supply Chain and Sustainment Engineering
8. Genetic Engineering & Biotechnology News reports on novel hit-to-lead drug discovery
9. Pittsburgh Region Middle School Students Participate in Hands-on Tissue Engineering Summer Camp
10. American Oriental Bioengineering Proposes Offering of $85 Million of Convertible Notes
11. Touch Bionics wins the 2008 MacRobert Award - i-LIMB Hand recognised as the leading engineering innovation of the year
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Engineering nanoparticles for maximum strength
(Date:12/24/2014)... On Friday, December 19, 2014, ... Omnibus and Continuing Resolution Appropriations Act of 2015, ... condition eligible to receive funding through the Congressionally ... Department of Defense (DoD). The Hydrocephalus Association (HA), ... Hill, is celebrating this victory for the over ...
(Date:12/24/2014)... 23, 2014 Pipette.com announces their ... followers can submit their #HolidayInTheLab pictures for a chance ... mates. , For those struggling to think of a ... Holiday in the Lab Contest provides the ideal holiday ... to send pictures of their chemistree, holiday sweaters, ...
(Date:12/24/2014)... , Dec. 23, 2014  Rock Creek Pharmaceuticals, Inc., ... has filed a Clinical Trial Application (CTA) with the ... Regulatory Agency (MHRA) seeking regulatory approval to initiate clinical ... Anatabine Citrate. Contingent on the Company receiving ... Phase I trial to assess the safety, tolerability and ...
(Date:12/22/2014)... , Dec. 22, 2014  Alternative Energy & ... it has signed a letter of intent to ... developed and patented a nanotechnology-based development platform used ... that enable rapid on-site collection and testing to ... health issues in an immediate, non-invasive and cost-effective ...
Breaking Biology Technology:Rare Brain Condition Now Eligible for Department of Defense Research Dollars 2Major Pipette Distributor Pipette.com Announces their Holiday in the Lab Contest 2Rock Creek Pharmaceuticals Files Clinical Trial Application in the UK for Clinical Trials of Anatabine Citrate Formulations 2Rock Creek Pharmaceuticals Files Clinical Trial Application in the UK for Clinical Trials of Anatabine Citrate Formulations 3ALNE Announces Intention To Acquire BioTechPharma 2
... Sosei Group Corporation,("Sosei"; TSE Mothers Index: 4565), ... its wholly owned Japanese subsidiary, has,entered into a ... ("ASKA", TSE First Section Index: 4514) for the ... NorLevo(R) is an oral emergency contraceptive "morning after ...
... as bioethanol is to make a major contribution to our ... some tiny insect helpers, says Michael Scharf, an assistant professor ... In a review to be published in Biofuels, Bioproducts ... how the enzymes produced by both termites and the micro-organisms ...
... SAN DIEGO, Oct. 21 Cadence Pharmaceuticals,Inc. (Nasdaq: ... in-licensing,developing and commercializing proprietary product candidates principally,for use ... company,s,President and CEO Theodore Schroeder will present the ... 9:30am Pacific Time (12:30pm,Eastern Time) during the BIOCOM ...
Cached Biology Technology:Sosei Agrees Terms With ASKA for Commercialisation of SOH-075 (NorLevo(R)) 2Digesting the termite digestome -- a way to make biofuels? 2Cadence Pharmaceuticals' CEO Theodore Schroeder to Present at the BIOCOM Investor Conference 2
(Date:12/17/2014)... , Dec. 16, 2014 Research and Markets ... addition of the "Global Chemical Sensor Market ... http://photos.prnewswire.com/prnh/20130307/600769 One ... increasing demand for medical sensors in biomedical applications. ... for quick and correct diagnosis during surgical procedures. ...
(Date:12/11/2014)... , Dec. 10, 2014  That blood pressure plays a ... while. Hypertension – the medical term for high blood pressure ... 1800s, and the inflatable cuff that,s used in measuring blood ... mean there,s nothing new about hypertension, its triggers and its ... about the condition and the best ways to treat it. ...
(Date:12/10/2014)... SAN DIEGO , Dec. 9, 2014 ... and collaboration catalyst that provides the connective tissue that ... by enabling them to easily share client-level information; earned ... Foundation to expand to organizations serving seniors aging in ... San Diego" partner on December 11 th 4-6p. ...
Breaking Biology News(10 mins):Global Chemical Sensor Market 2015-2019: Key Vendors are Abbott Laboratories, Bayer, Hoffmann La-Roche, Johnson & Johnson, NGK Spark Plugs and Robert Bosch 2Research points to need for new approaches to treatment of high blood pressure 2Research points to need for new approaches to treatment of high blood pressure 3Research points to need for new approaches to treatment of high blood pressure 4Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 2Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 3Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 4
... ever met a cat that doesn't go crazy over catnip? ... world don't respond to it at all, according to the ... Chemical & Engineering News, the weekly newsmagazine published by the ... sensitivity is inherited, says Carolyn M. McDaniel, a veterinarian at ...
... responsible for controlling a first key step in the creation ... journal Nature tomorrow (Thursday 27 October 2005). , The gene, ... once a sperm enters an egg, giving it a crucial ... , The absence or mutation of this gene in the ...
... China have an increased risk of schizophrenia, consistent with ... and schizophrenia, according to a study in the August ... and human rights. , Schizophrenia is a common form ... and delusions, as well a as deterioration of social ...
Cached Biology News:Many cats unaffected by catnip, C&EN reports 2Scientists unpick genetics of first 15 minutes of life 2Prenatal exposure to famine increases risk of schizophrenia 2