Search results for "Direct methods"

showing 3 items of 13 documents

Nanoscale ear drum: graphene based nanoscale sensors.

2012

The difficulty in determining the mass of a sample increases as its size diminishes. At the nanoscale, there are no direct methods for resolving the mass of single molecules or nanoparticles and so more sophisticated approaches based on electromechanical phenomena are required. More importantly, one demands that such nanoelectromechanical techniques could provide not only information about the mass of the target molecules but also about their geometrical properties. In this sense, we report a theoretical study that illustrates in detail how graphene membranes can operate as nanoelectromechanical mass-sensor devices. Wide graphene sheets were exposed to different types and amounts of molecul…

Chemical Physics (physics.chem-ph)FOS: Computer and information sciencesCondensed Matter - Materials ScienceMaterials scienceDopantGrapheneDopingDetectorNanoparticleMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesNanotechnologylaw.inventionComputational Engineering Finance and Science (cs.CE)Molecular dynamicslawDirect methodsPhysics - Chemical PhysicsGeneral Materials ScienceComputer Science - Computational Engineering Finance and ScienceNanoscopic scaleNanoscale
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Automated diffraction tomography combined with electron precession: a new tool forab initionanostructure analysis

2009

AbstractThree-dimensional electron diffraction data was collected with our recently developed module for automated diffraction tomography and used to solve inorganic as well as organic crystal structuresab initio. The diffraction data, which covers nearly the full relevant reciprocal space, was collected in the standard nano electron diffraction mode as well as in combination with the precession technique and was subsequently processed with a newly developed automated diffraction analysis and processing software package. Non-precessed data turned out to be sufficient forab initiostructure solution by direct methods for simple crystal structures only, while precessed data allowed structure s…

DiffractionDiffraction tomographyReciprocal latticeMaterials scienceElectron diffractionElectron tomographyDirect methodsAb initioAnalytical chemistryPhysics::OpticsEnergy filtered transmission electron microscopyComputational physicsMRS Proceedings
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Application of delta recycling to electron automated diffraction tomography data from inorganic crystalline nanovolumes

2013

δ Recycling is a simple procedure for directly extracting phase information from Patterson-type functions [Rius (2012). Acta Cryst. A68, 399-400]. This new phasing method has a clear theoretical basis and was developed with ideal single-crystal X-ray diffraction data. On the other hand, introduction of the automated diffraction tomography (ADT) technique has represented a significant advance in electron diffraction data collection [Kolb et al. (2007). Ultramicroscopy, 107, 507-513]. When combined with precession electron diffraction, it delivers quasi-kinematical intensity data even for complex inorganic compounds, so that single-crystal diffraction data of nanometric volumes are now availa…

Diffraction[delta] recycling; direct methods; structure solution; electron diffraction; automated diffraction tomography; nano electron diffraction; precession electron diffraction; nanocrystals.Reflection high-energy electron diffractionMaterials scienceGas electron diffractionAnalytical chemistrydirect methodsDiffraction tomographyprecession electron diffractionElectron diffractionnanocrystalsStructural BiologyDirect methodsstructure solutionautomated diffraction tomographynano electron diffractionPrecession electron diffractionelectron diffractionElectron backscatter diffraction[delta] recycling
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