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.
Results
Showing 1 to 20 of 70 for “"Physisorption"”.
-
Decorating Crystallites with Atoms and Small Molecules: A First-Principles Investigation
… Nowadays, it is well-entrenched that physisorption acts as a precursor paving the way for chemisorption and subsequent catalytic processes. Adsorption of noble gases and small probe molecules onto crystalline surfaces epitomizes physisorption. Due to its intricate nature, a delineation …
-
Simulations of the hydrogen storage capacities of carbon materials
… have always been regarded as the most attractive physisorption substrates for the storage of hydrogen. Theoretical and experimental studies on various model carbon systems, however, failed to reach the elusive goal. In this work, it is shown that insufficiently accurate carbon - hydrogen diatomic …
-
Nanostructured hybrid organic/inorganic materials by the nanobuilding blocks (NBB) approach
… RAMAN, multinuclear NMR spectroscopies, SEM, N2 physisorption, Thermal analyses (TG/DTA), DSC. NBBs were used to prepare methacrylate-based matrices, which were subsequently exploited in order to produce patternable films by the two photon polymerisation technique (TPP). Epoxy-based matrices were …
-
Silica diagenesis and its pore-scale influence on the characteristics of the upper and lower Bakken shales, Williston Basin, North Dakota and Montana
… electron microscopy (FE-SEM), and nitrogen physisorption. XRF analysis provided a compositional framework to assist in selecting ten sample locations within the cores. FE-SEM and XRD analysis paired with quartz crystallinity index calculations assisted in determining the nature and extent of …
-
Scanning tunneling microscopy and spectroscopy of tip-induced direct writing of nanometallization in ultra-high vacuum
… Ti evaporation is also discussed to prevent physisorption of precursor molecules that promote unwanted and unintended effects. In addition, nanocontacts between a carbon nanotube and HfB2 and MgB2 are presented. STS results confirm that the bandgap energy of the carbon nanotube is unperturbed …
-
Synthesis, characterization and reactivity of tungsten oxynitride
… by X-ray diffraction (XRD), nitrogen physisorption, and CO chemisorption. In addition, some sample compositions were determined by elemental analysis. Samples were prepared at various heating rates (β), allowing a Redhead analysis to be carried out giving an activation energy of …
-
Gas phase heterogeneous catalyst performance testing in laboratory fixed-bed reactors
… in respect of their pore size distributions (N2 physisorption and mercury intrusion porosimetry (MIP)), particle size distributions (by photo- and microscopic analysis), bulk and particle densities and product gas compositions (by gas chromatography) to enable evaluation of the various criteria …
-
Carbeto de molibdênio promovido por níquel como catalisador na reação de reforma seca do metano
… electron microscopy (SEM and TEM), N2 physisorption, CO chemisorption, temperature-programmed surface reaction (TPSR) and Raman spectroscopy. The catalysts evaluations showed that the nanostructured β-Mo2C morphology is more resistant to deactivation than the not nanostructured one. …
-
Kinetic studies of the reaction of gallium arsenide with molecular chlorine and iodine
… etching of silicon. This mechanism involves the physisorption of the halogen molecule on the semiconductor surface followed by the dissociation of the molecule into chemisorbed atoms, and finally the reaction of these atoms with the surface to yield gaseous products. The first and the half order …
-
Characterization and Reactivity of Mo₂C
… spectroscopy (XPS), CO chemisorption, and N₂ physisorption. The catalytic activity of the β-Mo₂C was tested for cumene hydrogenation under high pressure conditions, and the effect of sulfur and oxygen poisons on cumene hydrogenation was also investigated. As a complement to the work done on …
-
Hidrogenação de ácido levulínico a gama-valerolactona empregando fosfetos de metais de transição suportados em sílica
… reduction. The samples were characterized by N2 physisorption at -196 ˚C, X-Ray diffraction, inductively coupled plasma optical emission spectrometry, CO chemisorption and temperature programed CO desorption. Temperature programed surface reaction experiments were also performed with 30 wt% …
-
Montmorillonit K10 als Trägermaterial in der metallocenkatalysierten Olefinpolymerisation; Strukturanalyse des Schichtsilicats und Katalysatorsystems, Charakterisierung der Nanocomposite
… TG/DTA-MS, REM, TEM, Pulverdiffraktometrie, N2-Physisorption, FTIR und 29Si-, 27Al-, 1H- MAS-NMR-Spektroskopie durchgeführt. Anhand des Vergleichs mit dem unbehandelten Rohmaterial Montmorillonit wird dargelegt, dass durch die Säureaktivierung Kristallite entstehen, welche in der Mitte eine noch …
-
Analysis of membrane systems using lipoprotein nanodiscs
… soluble proteins and Nanodiscs. A novel direct physisorption strategy was developed to interface Nanodiscs with the silica surface. Implementation of a nonlinear analyte gradient approach extends the capabilities of the microring resonator technology to single run kinetic experiments. Mass …
-
Ionic Liquids Tethered to Activated Carbon for Capture of Airborne Toxins
… were tethered to the AC using physisorption techniques. The technique was effective in tethering the ILs to the surface and allowing the ILs to remain partially tethered after independently being washed with deionized water and going through temperature programmed desorption …
-
Design of Robust Heterogeneous Catalysts for Sustainable Chemistry
… by solid state NMR, FT-IR, PXRD, TGA, N2-physisorption and TEM. Hyperpolarized 129Xe NMR was used to study the effect of nickel loading and annealing time on pore structure. The microporous materials showed good thermal stability and activity in selective hydrogenation of aryl acetylenes …
-
Mesostructuring of SiCN Materials and Catalysts via Microphase Separation Technique utilizing High-Density Polyethylene Blocks
… were characterized by TEM, powder XRD, and N2 physisorption. The stability of nanoparticles may be due to the nitrogen functionality of Si-C-N network (Figure 1.2). The catalytic performance of the synthesized catalyst was demonstrated in the oxidation of cyclic and linear alkenes with air. The …
-
Design and Development of Biocompatible MOFS and Silica-Based Nanocarriers with Controlled Pharmacokinetics for Drug Delivery Applications
… analogues were characterized N2 physisorption, X-ray diffraction (XRD) analysis, and Fourier Transform infrared (FTIR) analysis to confirm successful drug loading and to assess any changes to physiochemical properties upon drug loading. The drug release experiments were performed …
-
Synthesis and Characterisation of Porous Mixed-Ligand Metal-Organic Frameworks for Sorption Studies
… (MOFs) have been identified as promising physisorption candidates because of their unique structures. MOFs are a class of crystalline materials consisting of coordinate bonds between metal ions and organic ligands. The permanent porosity of MOFs enables them to be applied as gas storage …
-
Trägereinfluss bei Vanadiumoxid-Katalysatoren zur selektiven Oxidation kurzkettiger Alkane
… Eine Vielzahl an analytischen Methoden (N2-Physisorption ("BET"), XRD, FTIR-, UV/Vis-, Raman- und NEXAFS-Spektroskopie, TGA, TEM und SEM, XRF) wurde angewendet, um die Topologie der Vanadiumoxid-Titanoxid-Oberflächenstrukturen sowie die molekulare Struktur der Vanadiumcluster aufzuklären und …
-
Site-specific immobilization of tetrazine-modified green fluorescent protein on trans-cyclooctene surfaces
… and biosensors. Non-covalent protein adsorption (physisorption), the easiest of all protein-attachment approaches, suffers from several drawbacks and was rejected for this work. Although the covalent attachment (chemisorption) of peptides and proteins to solid substrates has long been achieved, …
Page 1 of 4