Showing papers in "Ultramicroscopy in 2007"

TL;DR: The current results demonstrate that specific regions of interest can be accessed and preserved throughout the sample-preparation process and that this preparation method leads to high-quality atom probe analysis of such nano-structures.

TL;DR: An experimental software module has been developed for the Tecnai microscope for such an automated diffraction pattern collection while tilting around the goniometer axis that allows automated recording of diffraction tilt series from nanoparticles with a size down to 5nm.

TL;DR: It is shown that superhydrophobic surfaces have low hysteresis and tilt angle and Tribological properties play an important role in many applications requiring water-repellent properties.

TL;DR: The ability of the interface to support high pressure requires high asperity density and size, so it is in conflict with the requirement of low fractional solid-liquid contact area for low CAH and slip length.

TL;DR: An alternative real space algorithm (Peak Pairs) based on the detection of pairs of intensity maxima in an affine transformed space dependent on the reference area is proposed and exhibits good behaviour at heavily distorted defect cores, e.g. interfaces and dislocations.

TL;DR: This work demonstrates experimentally, for the first time, a new form of lensless microscopy that contains the entire wavefunction emanating from the sample and large scale, quantitative phase information can be measured, unlike in conventional (Zernike) methods.

TL;DR: 3D visualization and structural analysis of a rod-shaped specimen of a zirconia/polymer nanocomposite material carried out by transmission electron microtomography with particular emphasis on complete rotation of the specimen, suggesting that the specimen may have to be tilted to +/-80 degrees for truly quantitative measurements.

TL;DR: Dual beam scanning electron microscope/focused ion beam (SEM/FIB) methods complement electropolishing methods and enable specimens to be made from a wider range of materials and improve the shape, surface finish and taper angle of specimens.

TL;DR: This work presents an approach for the simulation of complete electron backscatter diffraction (EBSD) patterns where the relative intensity distributions in the patterns are accurately reproduced.

TL;DR: It is proposed that thermal diffuse scattering is the important incoherent scattering mechanism involved in pattern formation and a simple intensity correction procedure is introduced based on the two-beam dynamical theory, originally proposed by Blackman for transmission electron diffraction patterns.

TL;DR: All three methods of aminofunctionalization were found fully satisfactory for attachment of single antibodies to AFM tips, only in a parallel macroscopic assay on silicon nitride chips a minor difference was found in that APTES appeared to yield a slightly lower surface density of amino groups.

TL;DR: Analytical expressions are given for beam broadening, delocalization length, energy broadening due to core-hole and excited-electron lifetimes, and for the momentum resolution in angle-resolved EELS.

TL;DR: The first fabrication and application of a miniaturized electrostatic einzel lens driven as TEM quarter-wave phase plate, which proves to be mechanically stable and does not impair image quality, in particular it does not reduce the high-resolution signal.

TL;DR: The influence of the tilt correction and also the trapezium distortion which appears at low magnifications will be discussed and an additional rhomboidal distortion will be introduced which is independent of the magnification used.

TL;DR: A new method of infrared micro-spectroscopy, which aims at performing "chemical mapping" of various objects with sub-wavelength lateral resolution by using the infrared vibrational signature characterizing different molecular species, is analyzed.

TL;DR: The present detector is already very useful for experiments that require a high DQE at very low doses, and suggestions for further improvements to be made with confidence are allowed.

TL;DR: In this article, a miniature electrostatic element has been designed to selectively apply a 90 degrees phase shift to the unscattered beam in the back focal plane of the objective lens, in order to realize Zernike-type, in-focus phase contrast in an electron microscope.

TL;DR: It is shown that EDXS data may be erroneous for specimens containing voids, and that back-scattered electron images have to be used to correct for these errors.

TL;DR: The generation and control of electron pulses in the TEM to obtain a temporal resolution <10(-6)s will be described and the effect of the pulse duration and current density on the spatial resolution of the instrument will be examined.

TL;DR: A new fast electron diffractionometer working with high dynamic range and linearity for crystal structure determinations and detailed atomic bonding information of CaF(2) as revealed for the first time by precise electron diffractometry is presented.

TL;DR: In 3DAP analysis of low thermal conductivity materials, the use of lower repetition frequencies and specimens with large shank angles is shown to improve mass resolution and reduce the noise and degradation in quantitative accuracy resulting from increases in base temperature.

TL;DR: It is demonstrated that AFM can obtain high-resolution images and the elastic information about biofilms and the magnitude of the force between a tip and the surface of the biofilm gets stronger, suggesting that extracellular polymeric substances (EPSs), sticky components of bioFilms, accumulate over thesurface of cells upon the initial attachment of bacterial cells to surfaces.

TL;DR: Intensities in experimental precession patterns have been quantified and are shown to be less dynamical.

TL;DR: It is shown that AFM maps of the biomaterial surface taken at different scanning lengths are not completely consistent when they are taken at the same scanning resolution, as it is usually done: AFM images of different scanning areas have different point-to-point physical distances.

TL;DR: Novel methods for specimen preparation using a dual beam FIB are developed, including site-specific techniques and lift-out methods aimed at material and device applications, and a conventional electropolished specimen is used as a blank.

TL;DR: In this paper, the parent β-orientation maps of titanium alloys can reliably be reconstructed from inherited α maps in most cases, and the limits of the reconstruction method according to the inherited α microstructure are also pointed out.

TL;DR: Three-dimensional atom probe analyses of the AISI/SAE 4340 steel show that Si rejection from the cementite is first detected after low-temperature tempering for times of 1 h, and that Mn and Cr contents are increased, and Ni contents decreased, in cementite according to their carbide- and non-carbide-forming tendencies, respectively.

TL;DR: Characterization of monolithic active pixel sensors (MAPS) in a scanning electron microscope (SEM) as well as in a transmission electron microscopy (TEM) using the MIMOSA V (MV) chip is discussed.

TL;DR: It is suggested that the impact of the particle-size distribution accounts for the discrepancy between the energy-gap values derived from VEELS of single QDs and from optical methods of ensembles of QDs.

TL;DR: It is found that the damage observed in one TEM can be avoided by use of a cold finger, and the morphology of the damage imply that water vapour, which is present as a background gas in many vacuum chambers, can damage the nanotube structure through electron beam-induced chemical reactions.