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 31 for “"Physical adsorption"”.
-
Functionalization of Metal Oxide Surfaces through Chemical Reactions and Physical Adsorption
… with potential applications in catalysis, adsorption, and materials chemistry. The functionalization of a material’s surface can dramatically change its physical and chemical properties. The research described herein is built on the foundation of traditional techniques used for synthesis, …
-
Physical adsorption of argon, krypton and nitrogen on iron and pyrex at very low pressures
… not necessarily liquid-like and is a function of adsorption temperature. Comparisons were made between the modified and the original theories and it was found that the modified theory had a wider applicability and gave better data correlation for all five systems in the present study. It was found …
-
A study of the physical adsorption of nitrogen gas on polished 347 stainless steel at very low pressures
This investigation involves the study of the physical adsorption of nitrogen gas on a polished 347 stainless steel surface in the 1 x 10⁻⁹ to 1 x 10⁻⁷ torr pressure region. Characterization studies on the polished 347 stainless steel surface were also conducted utilizing a scanning electron …
-
Decorating Crystallites with Atoms and Small Molecules: A First-Principles Investigation
Adsorption of gaseous particles on solids offers a broad array of idiosyncratic functional properties such as those observed in scattering experiments. Nowadays, it is well-entrenched that physisorption acts as a precursor paving the way for chemisorption and subsequent catalytic processes. …
-
Modelling of transport processes involved in service life prediction of concrete: important principles
… reactive (e.g. carbonation and chemical-physical adsorption-desorption) matter in the pore solution and in the air-filled space in the pore system of the material. The governing equations describing the variation of concentrations of different substances and temperature within the …
-
A study of recognition coating response for quartz crystal microbalances
… exist. BET isotherm plots indicate that heats of adsorption values for the interactions fall within the range of physical adsorption. At high analyte concentrations, PEI coated sensors may behave differently because multilayering interactions increase. At low concentrations, monolayer adsorption …
-
THE DEVELOPMENT AND STUDY OF CHELATING SUBSTRATES FOR THE SEPARATION OF METAL IONS IN COMPLEX SAMPLE MATRICES
… small, low molecular weight organic molecules by physical adsorption and chemisorption processes respectively. Improvements in the impregnation of substrates were developed, based upon ultrasonic agitation, along with improvements in the detection of metal ions by the use of a noise reduction …
-
The effect of varying food-to-microorganism ratios on phosphate uptake in an activated sludge environment
… biochemical in nature. It was also found that physical adsorption was not the primary mechanism of phosphate uptake in an activated sludge environment, and the best overall soluble phosphate removal occurred when the food-to-microorganism ratio ranged between 0.75 and 1.25.
-
Changes of some optical constants of thin metallic films due to exposure to gases
… The gradual change in all gases was due to physical adsorption. The possibility that chemisorption might have caused the initial change in oxygen was pointed out, but this experiment did not allow a definite choice to be made.
-
INVESTIGATION OF CHELATING DYE IMPREGNATED RESINS FOR THE SELECTIVE ADSORPTION AND SEPARATION OF TRACE METALS FROM AQUEOUS SOLUTIONS
… chelating dyes by either covalent bonding or physical adsorption respectively. Large particle size polystyrene resins were used for preliminary investigations of dye loading and metal retaining capacities. After crushing resins to an intermediate particle size, capacity factors (k' values) and …
-
Aplicação de microemulsões na solubilização de frações pesadas de petróleo
… - Xylene (system 4). In parallel experiments of physical adsorption were carried out by the static method, with the intention of simulating natural conditions of reservoirs. Crude oil of the Fazenda Belém field (Rio Grande do Norte), was used as solute, xylene as solvent and the Assu sandstone …
-
THE FABRICATION AND STUDY OF METAL CHELATING STATIONARY PHASES FOR THE HIGH PERFORMANCE SEPARATION OF METAL IONS
… modified with heterocyclic organic acids, using physical adsorption and chemisorption processes respectively. A hydrophilic silica substrate was covalently bonded with a chelating aminomethylphosphonic acid group, to assess the chelating potential of this molecule. These substrates were …
-
The role of quenched disorder, interfaces and confinement on the glassy dynamics of colloidal suspensions, thermal liquids and films
… and topographic properties of surfaces, and physical adsorption. The spatial gradient of alpha relaxation time and glass transition temperature, interfacial and vitrified dead-layer thickness, spatial decoupling of relaxation in films from the bulk, elastic shear modulus, and characteristic …
-
Development of Carbon-Based, Controlled-Release Soil Ameliorants Through Chemical Pathways
… with chemical stabilization rather than mere physical adsorption. Collectively, these results confirm that the CCT® process effectively carbonizes diverse lignocellulosic residues and produces nutrient-functionalized matrices suitable for use as slow-release fertilizers, with structural and …
-
Molecular Modeling Of Energetic Materials And Chemical Warfare Agents
… by concentration or prefiltration through physical adsorption. So it is necessary to study the adsorption behavior of the contaminants in carbon slit pores as a preliminary step to the sensing process.</p> <p>In this work, molecular modeling or simulation is proposed as a theoretical tool …
-
Laccase-based Biocatalytic Systems for Recalcitrant Micro-Pollutants Degradation and Energy Generation
… exhibited high effectiveness as support for physical adsorption of laccase. The active laccase coating on CNTs membrane can be renewed after simple cleaning and re-immobilization. The biocatalytic membrane also showed substantial improvement in micro-pollutant removal compared with the …
-
Particle-modified Surface Plasmon Resonance Biosensor
… using two methods: thiolsilane coupling and physical adsorption aided by mechanical pressure. The bio-sensitivity towards an antigen/antibody interaction was lower than an SPR biosensor with an alkanethiolate SAM due to the difference in ligand capacity and position in the evanescent field. …
-
Synthesis of 6-Substitutedchromone-2- Carboxamide derivatives as corrosion inhibitors for metals in acidic medium
… showing the highest %IE (97.44%). The Langmuir adsorption isotherm was found to be the best-fit for all the corrosion inhibitors for all metal surfaces. All the synthesized compounds reduced the corrosion rate of three metals in the HCl solution. These corrosion inhibitors also exhibited …
-
DERIVATIZATION OF DIIMINE TRICARBONYL Re(I) COMPLEXES FOR COOPERATIVE CATALYSIS AND SURFACE IMMOBILIZATION
… including homogenous molecular templating, physical adsorption, and surface immobilization to promote the binuclear pathway in photochemical CO2 reduction using the Re(I) compounds. In the homogenous approach, we attempted to template dimeric interactions by synthesizing a polymeric …
Page 1 of 2