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Showing 1 to 10 of 10 for “"Colloidal probe"”.
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Direct Force Measurements on the Colloidal Scale: From Modified Electrodes to Particle Manipulation
… of thin films have been studied by the colloidal probe technique. One central point is the combination of direct force measurements with an electrochemical setup in order to tune interfacial properties of an electrode modified with an organic layer. In particular the adhesion and ion …
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Surface mechanics of polyacrylamide hydrogels following wear
… are performed on the surface using a colloidal probe in an atomic force microscope (AFM), and the elastic modulus is computed from the region of the curves fitting a Hertzian contact regime. The results show that the surfaces are stiffer directly after wear. These changes are …
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Design of Fouling-Resistant Coatings for Energy Systems: Theory and Proof of Principle at Realistic Conditions
… force microscope (HPAFM) capable of performing colloidal probe measurements at in-situ PWR pressure and temperature. The results are compared to flow loop tests, and the coating stability is tested in an irradiated flow loop with PWR spectrum. A set of promising coating materials is found, with …
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Direct Measurements of Polyelectrolyte Brush Responses using Atomic Force and Optical Microscopy
… active materials, as well as contact mechanics, colloidal arrangement, and (bio) adhesion. In particular, the soft colloidal probe (SCP) force spectroscopy has been developed. This technique improves massively the sensitivity for the investigation of adhesion energy of soft surfaces. Also, this …
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Aufbau und Mechanische Eigenschaften von Mischkomponent Polyelektrolytfilmen
… zwei Methoden untersucht: SIEBIMM-Methode und Colloidal-Probe-AFM-Technik. Aus den Messungen folgte, dass mit steigendem molarem Anteil der PGA Monomere in der gemischten PA-Lösung der resultierende PE-Film weicher wurde. Der Elastizitätsmodul ist um zwei Größenordnungen kleiner für Filme mit x …
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Integrating novel rheological tools with microscopy to characterize viscoelastic properties of complex materials
… is a technique that uses Brownian motion of colloidal probe particles to characterize the mechanical properties of materials at micron length scales. However, this method cannot be used in higher modulus materials (G*>10^1 Pa) because the particles experience restricted Brownian motion. To …
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Controlling Colloidal Stability using Highly Charged Nanoparticles
… components of the project centered on a model colloidal system containing silica microparticles at the isoelectric point where the suspensions are unstable and prone to flocculation. The stability of the silica suspensions was studied in the presence of highly charged nanoparticles. Initial …
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Nanomechanik und Adhäsion von Polyelektrolytmultischicht-Hohlkapseln
… mechanischen Eigenschaften wurden mit der AFM „colloidal probe” Technik untersucht. Dabei zeigte sich, dass die Kraftdeformationskurven für kleine Deformationen den nach der Schalentheorie vorhergesagten linearen Verlauf haben. Ebenso wurde die quadratische Abhängigkeit der Federkonstanten von …
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Bacterial adhesion and detachment from model mineralized biofilms
… but these results may not be reliable due to colloidal probe roughness and biofilm thickness. While the colloid roughness leads to an underestimation of the elastic moduli, small biofilm thickness may enhance substrate effects, thereby causing an overestimation of the stiffness. Further …
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THE INFLUENCE OF THE MICROENVIRONMENT OF HEALTHY AND TUMORAL CELLS
… of this work was to develop novel native ECM probes to investigate early mechanotransductive cellular interactions by means of AFM-based force spectroscopy measurements. ECM probes reproduce faithfully the structural and compositional complexity of the ECM; selection of patient derived ECMs …