Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Scanning Force Microscopy"”.
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Imaging Single-Electron Charging in Nanostructures by Low-Temperature Scanning Force Microscopy
… instrument of choice is a lowtemperature atomic force microscope (AFM) that is sensitive to electrostatic sample forces. A theory of the interactions between single-electron charging of a quantum dot and the AFM tip and cantilever is worked out in linear response. In semiconducting CNTs we …
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Surface Enhanced Infrared Absorption on Au Nanoparticle Films for Optical Biosensing
… The AuNP film morphology was characterized with scanning force microscopy and scanning electron microscopy. SEIRA ac- tive AuNP films were used as optical sensors for the ex-situ measurement of specific antibody-antigen coupling and the in-situ measurement of adsorbates (octadecanethiol, DNA) …
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Synthesis, micellar properties and application of amphiphilic linear block copolymers with different microstructure but same molecular weight
… spectroscopy, dynamic light scattering and scanning force microscopy. Due to the low molecular weight of the block copolymers an effect of the microstructure on the critical micelle concentration or the size of the micelle were hardly detectable. To intensify these effects, the synthesis was …
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Kraftmikroskopische Untersuchungen dünner ferroelektrischer Filme
… and barium titanate (BaTiO3 : BTO) by means of scanning force microscopy - specifically Piezoresponse and Kelvin-Probe. The film thickness of the investigated samples ranged between 50nm and 800nm. This experimental work focussed on the following issues: native domain structures, creation of …
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Reguläre bakterielle Zellhüllenproteine als biomolekulares Templat
… investigations by means of transmission electron microscopy, electron holography, scanning force microscopy, image analysis, and image processing. Preferred cluster-deposition sites are determined by correlation averaging. A more precise determination and quantification is obtained by Multivariate …
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Entwicklung magnetithaltiger Alginatbeads
… distribution are determined. Light, electron and scanning force microscopy are used to describe bead morphology and surface structure. SQUID magnetometer measurements are used to determine the magnetic behaviour of the solid beads. The beads stability within a chelating agent is established by the …
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Optical measurement of deformation fields and surface processes with digital speckle correlation
… by comparative measurements with high resolution scanning force microscopy (SFM) and by correlation measurements under a variation of experimental parameters. The results allow for the first time a quantitative whole-field monitoring of surface processes by remote optical means.
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Force microscopy of self-assembled amphiphilic films
Scanning force microscopy is a powerful technique to study surfaces in vacuum, air or liquids because of its nanometer spatial resolution and piconewton force resolution. The work presented here uses colloidal (steric and double layer) forces to investigate the shape of surfactant micelles on an …
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Applications and production of carbon nanotubes
… nanotubes as field emission sources and scanning force microscopy tips is described. The nanotubes display intriguing field emission behavior interpreted as the nanotube unraveling under the influence of the electric field. The unraveling process is believed to result in facile field …
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Incorporation of Cα,α-Disubstituted Amino Acids into Model Peptide Systems: Conformational Analysis and Possible Applications as Therapeutic Agents
… Aβ form only globular aggregates as imaged by scanning force microscopy and transmission electron microscopy. These samples show no signs of protofibrillic or fibrillic material even after prolonged periods of time (4.5 months). Also, 10 mole percent of AMY-1 prevented Aβ self-assembly for long …
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Amphiphilic block copolymers as templates for particle formation and positioning
… Micellar monolayers were characterized by Scanning Force Microscopy and the regularity of the lattice was quantified as the number of dislocations present for a given number of micelles. It was shown that micelles self-organize in a lattice with fewer defects (up to 40%) when a higher …
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'Quat-Primer' polymers based on b-PEI and their application in composites
… the surface of carbon fibres via electrostatic forces of interactions or epitaxial adsorption or both and (ii) to supply cyclic carbonate groups that can copolymerize with the amine components of epoxy resins during the curing step. Branched Polyethylenimine has primary, secondary and tertiary …
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Templated self-assembly of SiGe quantum dots
… are carefully analyzed by means of scanning force microscopy, transmission electron microscopy and x-ray diffraction measurements. Provided that correct template and overgrowth parameters are chosen, perfectly aligned and uniform SiGe quantum dot arrays of different period, size as …
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Mechanistic studies on transcription activation via DNA looping in a prokaryotic promoter-enhancer system
… of the transcription initiation reaction. (2) By scanning force microscopy it was determined that promoter-bound RNAP-sigma54 bends the DNA and is for this reason preferably localized in the end-loop of a supercoiled DNA, since the DNA is more bent in this region. The localization in the end-loop …
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Template-Controlled Synthesis of Magnetic/Semiconducting Nanoparticles within Amphiphilic Core-Shell Cylindrical Polymer Brushes
… the brushes was directly visualized on mica by scanning force microscopy (SFM). Amphiphilic brushes with 1500 block copolymer side chains and a length distribution of lw/ln = 1.04 at a total length ln = 179 nm were obtained. These amphiphilic polymer brushes can be regarded as unimolecular …
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Amphiphilic Diblock Copolymers: Study of Interpolyelectrolyte Complexation in Organic Media and Nanoencapsulation of Melatonin
… investigated using transmission electronic microscopy (TEM), scanning force microscopy (SFM), dynamic/static light scattering techniques, 1HMR and turbidimetric titrations, for two different systems: (i) homopolyelectrolyte/homopolyelectrolyte and (ii) homopolycation/negatively charged …
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Branched Glycopolymers
… surfaces were estimated using ellipsometry and scanning force microscopy (SFM) and found to depend on the catalyst amount and the comonomer ratio, gamma. In the case of a linear polymer brush, the surface was relatively smooth and uniform. Deprotection of the isopropylidene groups of the …
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Synthesis of linear copolymers and of polymer brushes substituted with spiropyran groups : a step towards light driven molecular walkers
… following a segment and soldier principle. Scanning force microscopy (SFM) was used to image the different polymer brushes. So far, no light-induced conformational changes were observed upon irradiation. In the case of the brushes this might be due to the very small fraction of spiropyran …
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Equilibrium and Dynamic Phase Behavior in Thin Films of Cylinder-Forming Block Copolymers
… (SBS) triblock copolymer, by tapping mode scanning force microscopy (TM-SFM). We present a procedure to establish reliably with TM-SFM the true surface topography of a soft polymeric sample. The measurement of an array of amplitude phase distance (APD) curves enables us to distinguish …
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Mesoscale Modeling of Phase Behavior in Thin Films of Cylinder-Forming ABA Block Copolymers
… of defects in the cylindrical phase. In-situ scanning force microscopy measurements are compared with the simulations based on DDFT. The close match between experimental measurements and simulation results suggests that the lateral defect motion is diffusion-driven. Finally, the morphological …
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