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 13 of 13 for “"van't Hoff"”.
-
Effect of column temperature on elution order in gas chromatography
… a derived thermodynamic equation based on the Van't Hoff equation was obtained and used to calculate the molar enthalpy and entropy of compounds over a range of temperatures. The experimental thermodynamic values were compared with the theoretical values obtained from the Clausius- Clapeyron …
-
Chemically bonded stationary phases using molecular tweezer hosts: A quantitative HPLC binding assay for nitro-aromatic guests
… on HPLC columns made from each of these CBSPs. Van't Hoff plots were generated to give a total of 22 enthalpies of retention which were compared with the corresponding enthalpies of complexation for the analogous host-guest complex in solution. The correlation was found to be within experimental …
-
Stability of Nucleic Acid Secondary Structures and Their Contribution to Gene Expression
… comparable, comparison of the calorimetrie and van't Hoff enthalpies indicate that the folding mechanism is not a two-state process. SVD analysis of the UV and CD spectral transitions confirm that formation of the stem-loop structure proceeds through a single significant folding intermediate. …
-
Cyclodextrin complexes of antimicrobial agents
… constant of the complex was modelled by the van't Hoff plot which yielded the thermodynamic parameters for complexation. Further confirmation of the inclusion of the antimicrobials within the cavity of the CyDs in aqueous solution was obtained from proton magnetic resonance and ultraviolet …
-
Structures and Reactivities of Ionized and Metal Cation-Containing Acetylene Clusters
… (C2H2)3 + + (H2O)n-1 ↔ (C2H2)3∙+(H2O)n using the van't Hoff plot revealed binding energies and reaction entropies identical to those recently published for the benzene+/water system thus providing even more evidence for the formation of benzene ions from ionized acetylene clusters.We also provide …
-
ANOMALOUS TRANSPORT:_FROM THEORIES ABOUT OSMOTIC PRESSURE TO A NEW APPROACH IN THE FRAMEWORK OF DYNAMICAL SYSTEMS
… and the classical theories, like the Van't Hoff or Morse equations for osmotic pressure, have been observed to fail in many circumstances and this has prompted the development of a quantity of models trying to describe osmotic processes in non-classical regimes. Recently some authors …
-
Interaction of oils with surfactants
… and entropies with use of a form of the Van't Hoff equation. It was found that alkane adsorption increases with decreasing alkane chain length and the isotherms show a greater curvature upwards for the shorter chain length alkanes suggesting that the adsorption becomes more favourable as …
-
Gas chromatography on self assembled single walled carbon nanotubes
… to commercial GC columns. Evaluation of Van't Hoff and Van deemter plots suggested that the CNTs followed classical chromatography behavior. Comparison of capacity factors (k') and isosteric heats of adsorption ([Delta]H_S) with a packed column containing a commercial sorbent (Carbopack …
-
Physico-chemical studies of block copolymers in aqueous solution
… process is half completed, AHcal, AHvH . the van't Hoff enthalpy and n the aggregation number. The modelled excess heat capacity data are in good agreement with the experimental calorimetric outputs. An enthalpy-entropy compensation plot for all data obtained indicate that the solvent-solute …
-
The effect of hydrocarbon exposure and temperature on the behaviour of elastomeric seals
… by performing swelling at 20oC, 35 oC and 50 oC. Van't Hoff plots were used to obtain enthalpies of mixing. It was found that all hydrocarbons swelled more as temperature rose. This is indicative of endothermic interactions between these species and polar NBR. However, it was observed that species …
-
Determination of Henry's Law Constants of Odorous Contaminants and Their Application to Human Perception
… can be calculated at any temperature using the van't Hoff Equation. The method was applied to three taste-and-odor compounds of moderate water solubility (about 100 mg/L). 2-Methylisoborneol (2-MIB) is a methylated monoterpene alcohol that is produced by actinomycetes and blue-green algae and …
-
Limiting membrane and diffusion behavior of a compacted sand-bentonite mixture for hydraulic and chemical containment
Sodium-bentonite (Na-bentonite) commonly is used either as an additive component or as the sole component of engineered barriers used for waste containment applications, because the tendency of Na-bentonite to exhibit high swell can result in the restriction of advective and diffusive contaminant …