نتایج جستجو برای: force absorption

تعداد نتایج: 317725  

Journal: :Science 2000
Giessibl Hembacher Bielefeldt Mannhart

The atomic force microscope images surfaces by sensing the forces between a sharp tip and a sample. If the tip-sample interaction is dominated by short-range forces due to the formation of covalent bonds, the image of an individual atom should reflect the angular symmetry of the interaction. Here, we report on a distinct substructure in the images of individual adatoms on silicon (111)-(7x7), t...

Journal: :Angewandte Chemie 2013
Ranjit Thakuria Mark D Eddleston Ernest H H Chow Gareth O Lloyd Barry J Aldous Joseph F Krzyzaniak Andrew D Bond William Jones

AFM of cocrystals: Atomic force microscopy can be used to observe phase changes at crystal surfaces where the transformation is accompanied by a change in the spacing between layers of molecules. The conversion of a metastable polymorph of the caffeine-glutaric acid cocrystal into the thermodynamically stable form was analyzed continuously in situ using intermittent-contact-mode atomic force mi...

2004
D. Jakubczyk G. Derkachov W. Bazhan M. Kolwas

Laser light scattering by a drying droplet of water fullerene suspension several micrometers in size was studied. Two light wavelengths were used. The evolution of refractive index and radius of the droplet was investigated. Resonant scattering was identified and analyzed. Some conclusions were drawn on the microscopic properties of the suspension. Supplementing measurements of samples obtained...

Journal: :Nano letters 2016
Michael Ellner Niko Pavliček Pablo Pou Bruno Schuler Nikolaj Moll Gerhard Meyer Leo Gross Rubén Peréz

Metal tips decorated with CO molecules have paved the way for an impressively high resolution in atomic force microscopy (AFM). Although Pauli repulsion and the associated CO tilting play a dominant role at short distances, experiments on polar and metallic systems show that electrostatic interactions are necessary to understand the complex contrast observed and its distance evolution. Attempts...

Journal: :Journal of visualized experiments : JoVE 2014
Marie E Kroeger Blaire A Sorenson J Santoro Thomas Emina A Stojković Stefan Tsonchev Kenneth T Nicholson

Atomic force microscopy (AFM) uses a pyramidal tip attached to a cantilever to probe the force response of a surface. The deflections of the tip can be measured to ~10 pN by a laser and sectored detector, which can be converted to image topography. Amplitude modulation or "tapping mode" AFM involves the probe making intermittent contact with the surface while oscillating at its resonant frequen...

Journal: :Biophysical journal 2012
Zhanghan Wu Eva Nogales Jianhua Xing

The dynamic assembly and disassembly of microtubules and the mechanical properties of these polymers are essential for many key cellular processes. Mathematical and computational modeling, especially coupled mechanochemical modeling, has contributed significantly to our understanding of microtubule dynamics. However, critical discrepancies exist between experimental observations and modeling re...

Journal: :Science 2000
F Oesterhelt D Oesterhelt M Pfeiffer A Engel H E Gaub D J Müller

Atomic force microscopy and single-molecule force spectroscopy were combined to image and manipulate purple membrane patches from Halobacterium salinarum. Individual bacteriorhodopsin molecules were first localized and then extracted from the membrane; the remaining vacancies were imaged again. Anchoring forces between 100 and 200 piconewtons for the different helices were found. Upon extractio...

Journal: :Monthly Notices of the Royal Astronomical Society 1974

M. A. Ghasemabadian M. Kadkhodayan,

In this paper, the energy absorption features of tri-layer explosive-welded deep-drawn cups subjected to quasi-static axial compressive loading are investigated numerically and experimentally. To produce the cups, tri-layer blanks composed of aluminum and stainless steel alloys were fabricated by an explosive-welding process and formed by a deep drawing setup. The quasi-static tests were carrie...

ژورنال: توانبخشی 2014

Objective: Unstable shoes have been recommended to osteoarthritis patients in order to reduce walking injuries. The aim of this study was to test the effect of unstable shoe on biomechanical selected variables related to injury during stanse phase of running. Materials & Methods: Twenty five healthy young male students available men (21±2.27years) participated in this study. Subjects were as...

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