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 30 for “"Tensiometry"”.
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Dynamic wetting of soft materials and applications of dynamic tensiometry
… a surface characterization technique (dynamic tensiometry) has been extended to provide further insight into the wetting properties of liquid-repellent surfaces, and the efficacy of engineered surfaces for applications in drag reduction, oleophobic fabric design and fog harvesting is detailed. …
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Characterization of surfactant adsorption at a liquid-liquid interface by drop volume tensiometry
Surfactant characterization is important for many practical applications, such as the removal of hydrophobic contaminants from soils through surfactant-enhanced washing or flushing processes. Dynamic interfacial tension measurements can be useful in describing the adsorption behavior of surfactants …
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Monolayer Studies of Mixed Films Containing Cerebrosides by Surface Tensiometry and Brewster Angle Microscopy
In this work surface pressure-area isotherms and Brewster angle microscope (BAM) images were obtained for two-component Langmuir monolayers of bovine and porcine cerebrosides with cholesterol and palmitic acid (PA), respectively, at the air-water interface. BAM images of bovine and porcine …
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Το διαβητικό πόδι: Κλινικοεργαστηριακή μελέτη
… photophlethysmography, and transcutaneous oxygen tensiometry. These methods have a wide application as they are ease to use, have a high degree of reproducibility und can be applied several times on the same patient with low cost. Transcutaneous oxygen tensiometry has the advantage to monitor …
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Experimental and Computational Vibrational Sum Frequency Spectroscopy Studies of Atmospheric Organics and Their Surface-Active Hydration and Oligomer Products at the Air-Water Interface
… sum frequency (VSF) spectroscopy, surface tensiometry measurements, classical molecular dynamics (MD) simulations, and density functional theory (DFT) calculations.
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Avaliação da resistência mecânica e da molhabilidade de fibras de aramida após tratamento com plasma de argônio
… minutes. The tests performed were tensile tests, tensiometry and scanning electron microscopy (SEM) By analyzing the results, it was observed that, for the 100 Watt treatment, the fiber presented an improvement in its wettability and an increase of 47% in the fiber’s strength resistance for the …
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Design Of Functional Dendrimer Nanocarriers And Their Formulations In Propellant-Based Inhalers For Pulmonary Drug Delivery
… molecular dynamics simulation and high pressure tensiometry, potential fluorocarbon-philic moieties were systematically screened. Surfactants with those chemistries as tail fragments were studied at the HFO|H2O interface for their ability to lower the interfacial tension at HFO|H2O interface. …
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Investigating the bioprotective properties of sugars
… (SDS) and sodium tetradecyl sulphate (STS). Tensiometry was used to examine the impact of sugars on the critical micelle concentrations (CMC), Gibbs free energy change of micellization ( Gmic), surface pressure, surface excess concentration and area occupied per surfactant molecule. The free …
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Tuning polymeric chiral surfactants for enhanced enantiomeric recognition in micellar electrokinetic chromatography
… by use of four techniques. While surface tensiometry was used for the determination of the critical micelle concentration (cmc), fluorescence measurements were used for the determination of the polarity of the modified polymeric surfactants. The information about the size of the polymeric …
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Molecular fundamentals of foam fractionation
… principles of the well-known bubble pressure tensiometry. The second stage of the fractionation process includes the detachment of a single bubble from a pore or capillary tip and its rising in a respective aqueous solution. The third and final stage of the process is the formation and …
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Surface Activity at the Air-Water Interface and Self-Stratification of Silica Nanoparticles Functionalized with Tri-Methoxy Poly(ethylene glycol) Silane
… particles was characterized using pendant drop tensiometry. A surrogate latex formulation was prepared to test the self-stratification of functionalized SNPs, consisting of 500 nm polystyrene spheres in aqueous suspension without surfactant. Films were formed on mica substrates and imaged in …
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Controlling the interfacial behaviour of colloidal microgel systems
… properties of the microgels were studied by tensiometry. Substantial reductions in the surface tension of water were observed for all microgels, close in magnitude to that achieved by the surfactant sodium dodecyl sulphate, but at a far lower concentration. The effect was influenced by a …
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Fluid mechanics of liquid drops and thin-films
… of the dissertation is on using pendant droplet tensiometry to measure surface tension of biological fluid secreted by N. rafflesiana pitcher plant. The values of pitcher fluid surface tension is found to be significantly lower than water. In parallel, experiments performed by our collaborators …
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Screening environmental Pseudomonads for characteristics suitable for a bio-engineered oil remediation agent
… assay and confirmed by quantitative tensiometry. The surface tension of cell-free culture supernatants produced by these isolates was between 24.5 – 49.1 mN m-1, with a minimum theoretical surface tension (Min) of 24.2 mN m-1. This is in agreement with earlier predictions, suggesting …
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Controlling molecular interactions to define interfacial phenomena and structure
… gel and foam. The main techniques used were tensiometry, diffusion NMR and small-angle neutron scattering (SANS). The experiments involved investigating the competitive interactions between Pluronic P123 and small molecule surfactants, SMS, (sodium dodecylsulfate, SDS or C12SO4Na, …
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Ethoxylated amine surfactants as model additives for engine friction reduction
… of E1812 in dodecane through pendant drop tensiometry and small angle neutron scattering (SANS). The surfactant was found to form spherical aggregates with a radius of ∼ 11 Å at 25 °C, and its behaviour was influenced by solvent changes and dopant addition. As explored by SANS in Chapter 4, …
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Bioadhesion to model thermally responsive surfaces
… responsive for various aqueous mediums by tensiometry. Factors such as oxygen, age, and surface mole fraction and how they affect the thermal response of the mixed SAM are discussed. Lastly, rat fibroblasts were grown on the mixed SAM and imaged by phase contrast microscopy to show …
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Surfactant Behavior in Atmospheric Aerosols
… in aqueous aerosol mimics by using pendant drop tensiometry to measure surface tension, UV-VIS to measure the formation of light-absorbing products, Aerosol chemical ionization mass spectrometry (Aerosol-CIMS) to characterize the reaction products, and a continuous flow streamwise thermal …
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Adsorption of organic friction modifiers at static and sheared interfaces
… aggregation of GMO in dodecane with pendant drop tensiometry and small angle neutron scattering. Additionally, the iron oxide surfaces used in the reflectometry studies are characterised through X-ray photoelectron spectroscopy, XRR and NR. Interestingly, a region of solvent depletion was found at …
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Poly(vinyl alcohol) based hydrogen-bonded multilayers : from pH-controlled multi-stage dissolution to zwitter-wettable surfaces
… which was studied by both goniometry and dynamic tensiometry. The time-dependent wetting behavior of these coatings was attributed to the transient surface rearrangement of hydrophilic functional groups towards the surface in response to exposure to a liquid water environment. Using a simple …
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