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 24 for “"Chemical Activation"”.
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Self-healing thermoset polymers and embedded 3D printing VIA chemical activation
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Sustainable biomass-derived hydrothermal carbons for energy applications
… more insights on the potentials of this thermochemical processing technique in relation to the production of functional carbon materials from crude biomass. First a detailed investigation on the HTC conversion mechanism of lignocellulosic biomass and its single components (i.e. cellulose, …
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Slurry abrasive particle agglomeration experimentation and modeling for chemical mechanical planarization (CMP)
… to predict silica-specific instability in chemical-mechanical polishing (CMP) slurries. In CMP, the formation of large agglomerates is of great concern, as these large particles are associated with high defectivity and poor polishing performance. The proposed model describes the complex CMP …
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Nanoporous carbon from corn cobs and its application
Chemical activation of corn cobs using phosphoric acid or potassium hydroxide can lead to nanoporous carbon having surface area in excess of 3800 m²/g and pore volume of 2.5cc/g. Dried, crushed, corn cobs were carbonized at temperatures between 450- 900⁰C and chemically activated using H₃PO₄ and …
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Regulation of Circadian Rhythms by Sleep -Wake Centers in the Brainstem and Basal Forebrain
… levels at the SCN delayed circadian rhythms. Chemical activation of the PPTg during the early night also induced significant delays in circadian rhythms, This data provides evidence for a potential means by which the sleep-wake and circadian cycles may interact, through activation of the PPTg, …
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Conversion of landfill composite to activated carbon as an approach to sustainable landfill management
… and heavy metals contents. The elemental and chemical constituents of an active and a closed landfill were compared using Fourier transform - infrared (FTIR) spectroscopy, scanning electron microscope/energy-dispersive X-ray (SEM/EDX) spectroscopy, and proximate analysis. The two landfills had …
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Chemically activated carbon using peat soil for heavy metals adsorption in industrial wastewater
… carbon from peat has successfully produced by chemical activation process using sulphuric acid as activating agents. The effect of heating temperature on the carbon content, the physical and chemical characterizations of peat activated carbons were studied. From this study, peat soil heated at …
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Thermochemistry of fluorinated aldehydes and corresponding radicals;thermochemistry and kinetics of diethyl ether and ethyl oxirane relative to reactions under atmospheric and combustion conditions
Fundamental thermochemical properties including enthalpies ([Delta]H_{f 298}), entropies (S(T)), heat capacities (Cp(T)), and bond dissociation energies (BDEs) for several common and complex hydrocarbon fuel species are determined using computational chemical methods. [Delta]H f 298 values are …
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Sulphur Chemistry in KOH-SO2 Activation of Fluid Coke and Mercury Adsorption from Aqueous Solutions
… carbons (SIACs) from high-sulphur fluid coke by chemical activation was investigated. Using KOH and SO2, the activation process was able to produce SIACs with controllable specific surface area (SBET), pore size distribution and sulphur content. The highest SBET was over 2500 m2/g and the highest …
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Application of palm shell activated carbon filter as a medium of indoor air contaminant adsorbent for indoor air quality improvement
… the effect of combination of physical and chemical activation towards PSAC properties and investigating of PSAC air filter performance used in Mechanical Ventilation Air Conditioning (MVAC) system. Preliminary studies began with IAQ monitoring in different building condition. The present …
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Slow pyrolysis of agro-food waste to produce biochar and activated carbon for adsorption of pollutants from model wastewater
… conditions was used as the precursor for activation study to produce high-quality activated carbon. Steam-led physical activation and KOH-led chemical activation of biochar were conducted, and process parameters such as temperature (700-900 °C) and activation time (60-120 min) were …
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Fabrication and Evaluation of Specialty Nonwoven Materials
… materials with high performance on chemical absorption, adsorption and on acoustic absorption and insulation using natural fiber nonwovens via carbonization and activation. Evaluation of these textile materials includes tensile strength, thermogravimetric analysis, sound absorption …
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Computational thermochemistry of hydrocarbons, oxygenates, cyclic alkanes, and furans
Fundamental thermochemical properties including enthalpies ([Delta]H _{f 298}), entropies (S (T)), heat capacities (C_p(T)), and bond dissociation energies (BDEs) for several common and complex hydrocarbon fuel species are determined using computational chemical methods. [Delta]H _{f 298} values …
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Thermochemistry reaction paths and oxidation kinetics on ketonyl and aldehydic nitrogen oxides, propene and isooctane: a theoretical study
Thermochemical properties for several atmospheric and combustion related species are determined using computational chemical methods coupled with fundamentals of thermodynamics and statistical mechanics. Enthalpies of formation ([Delta]H_f _{298}) are determined using isodesmic reaction analysis at …
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Investigations into the roles of Histamine Receptor H1 and extracellular vesicles in ovarian cancer cell behaviour
… processes, including cancer. Indeed, activation of histamine receptor H1 (HRH1) by histamine stimulates growth of OC cells in vitro and promotes the release of extracellular vesicles (EVs) in different cell lines. EVs are heterogeneous small vesicles involved in intracellular …
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Experiment, thermodynamic properties and modeling on combustion of methyl tert-butyl ether : isobutane and isobutene and thermodynamic properties of chloro alkanes and alkenes
… (C3C.), and sobutene, are analyzed. Thermochemical parameters are determined by ah initio Moller-Plesset (MP2(full)/6-31g(d)), complete basis set model chemistry (CBS-4 and CBS-q with MP2(full)/6-31g(d) and B3LYP/6-31g(d) optimized geometries), density functional (B3LYP/631g(d)), …
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Thermochemistry and kinetics: hydrogen atom addition reactions with alkenes, oxidation of cyclopentadienone, trifluoroethene and transport properties
Thermochemical and transport properties and reaction kinetic parameters are important to understand and to model atmospheric chemistry, combustion and other thermal systems. These processes are all important to the environment. Thermochemical properties kinetic parameters and models for several …
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Removal of Naphthenic Acid from Water Using Biomass-based Activated Carbon
… activated carbon from sawdust were physical activation using carbon dioxide (CO2) and chemical activation using phosphoric acid (H3PO4). For comparison, a commercially activated carbon was also used. The physically activated carbons were found to have lower surface area than the chemically …
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Soft Soil Stabilisation Using a Novel Blended Cementitious Binder Produced From Waste Fly Ashes
… cement-free WPSA, POFA and RHA under physico-chemical activation using flue gas desulphurisation (FGD) gypsum, for use in soft soil stabilisation. The effects of different binders produced from unary (WPSA), binary (WPSA and POFA) and ternary (WPSA, POFA and RHA) blended mixtures, along with …
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Predictive kinetic modeling of low-temperature hydrocarbon oxidation
… double bonds. More specifically, the role of chemical activation in reactions between *CH₂OO* and C=O/C=C species is explored using master equation calculations to obtain phenomenological rate coefficients k(T,P). In the case of reactions with C=O, the yield of collisionally stabilized SOZ at …
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