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 26 for “"Isothermal calorimetry"”.
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Durable high early strength concrete
… chloride dosage. The mixtures were subjected to isothermal calorimetry, strength testing, drying shrinkage, and various durability tests. The effects of cement content and calcium chloride dosage on concrete strength and durability were then investigated. In addition, the compressive strength …
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DEVELOPMENT OF SELF-HEALING SUSTAINABLE CONCRETE USING RECYCLED MATERIALS
… its relationship with autogenous healing using isothermal calorimetry, X-ray diffraction (XRD), and thermogravimetric analysis (TGA). It was found that the exterior of GGBS-blended concrete was prone to carbonation which affects its autogenous ability. The hydration rate and ultimate degree of …
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Specific Binding Affinity of the Non-Catalytic Domain of Eukaryotic Like Type IB Topoisomerase of vaccinia Virus
… <sup>15</sup>N relaxation measurements, and isothermal calorimetry (ITC) is used in this work to show that the NTD is capable of independently binding to DNA. Additionally, it is shown that the nature of the engagement of dsDNA by the NTD, in terms of affinity and characteristics of the …
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Characterization of Quarry By-Products as a Partial Replacement of Cement in Cementitious Composites
… and a modified ASTM C1897 Method A that utilizes isothermal calorimetry and thermogravimetric analysis. These various methods allowed for the determination of the physical properties (e.g., gradation, specific gravity, and morphology) and the chemical properties (e.g., mineralogy and reactivity in …
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Complexation Between DNA and Hydrophilic-Cationic Diblock Copolymers
… thermodynamics and strength - measured using isothermal calorimetry and circular dichroism spectroscopy, respectively - turn out to show a strong dependence on the cationic content in the diblock, leading to wide ranges of polyplex size, dispersity, and stability. Second, the effects of …
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Helical Pitch, Hydrophobic Binding, Chiral Templation, and Supramolecular Chelation of M-Phenylene Ethynylene Foldamers
… constants with palladium dichloride by isothermal calorimetry. The additional free energy of complexation for the folded oligomers is analogous to chelation by multidentate ligands, but here the ""multidentate ligand"" is held together by supramolecular rather than covalent bonds."
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Electrocaloric effects in multilayer capacitors of stoichiometric lead scandium tantalate with varying B‑site cation order
… quasi‑direct and indirect methods under (highly) isothermal and (highly) adiabatic conditions. For annealed MLCs of 0.9PST, in which large temperature changes have been previously driven over a wide range of temperatures using supercritical fields, EC effects are measured by direct isothermal …
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Structure-based Design of Small Molecule Inhibitors of HIV-1 Entry
… the atomic level. Using x-ray crystal structure, isothermal calorimetry and viral binding assay to guide design, we were able to improve the binding affinity more than 30 fold compared to the original NBD-556. Our most potent compound DMJ-II-121-R,R is able to bind to gp120 at a Kd of 0.11 …
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Understanding the retardation of cement hydration caused by zinc
… techniques were used through the project: isothermal calorimetry, pore solution analysis through x-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). This study sheds more light on the chemistry of the cement-zinc system, and a …
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Biophysical and structural studies of novel F420-dependent oxidoreductases in Mycobacterium tuberculosis
… tightly to the unusual flavin coenzyme F420 by isothermal calorimetry (ITC), saturation transfer difference (STD) NMR, and X-ray crystallography. Although recent studies have drawn attention to F420 due to its role in activating the promising anti-tuberculosis drug PA-824, little is known about …
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Evaluating shrinkage of fly ash - slag geopolymers
… the compressive strength variation with mixes. Isothermal calorimetry was performed on each of the sample to study the heat evolution that accompanies the reaction process and it was seen that at lower molarities, the initial rate of heat evolution was higher as compared to the higher …
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Structural Studies on Ferric Uptake Regulator Proteins from Mycobacterium tuberculosis
… shift assay (EMSA), site directed mutations, isothermal calorimetry (ITC), microPIXE analysis, extended X-ray absorption fine spectroscopy (EXAFS) and X-ray crystallography - we investigated the metal binding sites together with the nature and the structure of these proteins. The combination …
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Prospective retarders for alkali-activated slag: stability at high alkalinity, effects on setting behavior and strength of paste
… acid (EDTA) and zinc oxide nanoparticles. Isothermal calorimetry was the primary test conducted to observe effects on the reaction rate. Stability in the high pH environment was assessed visually and also chemically through infrared spectroscopy. Compressive strength tests were conducted …
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Characterizations of concretes with alkali-activated binder and correlating their properties from micro- to specimen level
… microstructure through XRD, FTIR, SEM/EDS, and isothermal calorimetry showed sodium aluminosilicate hydrate gel to be the primary strength contributing phase. Reaction rates increased with the slag content due to formation of additional calcium silicate hydrate (CSH) in the AAB paste matrix. …
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Molecular Crosslinking of Calcium-Silicate-Hydrate with Organosilanes: Toward Engineering of Cementitious Matrices with High Thermal Resistance
… chain organic molecules (nCH2=8). The results of isothermal calorimetry confirmed the positive action of inorganic and hybrid C-S-H seeds on the hydration of Type II cement system. Both types of seed incorporation to the cement system lead to the increased intensity on the onset of the hydration …
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Nucleation seeding in metakaolin geopolymers
… as external seeds in MK-NaOH geopolymers. Isothermal calorimetry revealed that the addition of these nanoparticles accelerated the rate of heat evolution from metakaolin-sodium hydroxide (MK-NaOH) geopolymers at early age (≤24h). This observation provided indirect evidence of a nucleation …
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Polyol induced extraction (PIE) of water from organic solvents
… phase separation process was investigated using isothermal calorimetry. At 20 <sup>o</sup>C, ∆H<sup>o</sup> is exothermic (-2.06 kJ/mol) for glycerol induced phase separation in ACN-water system and -7.07 kJ/mol at -10 <sup>o</sup>C. Considering the glycerol/ACN/water system at -10 <sup>o</sup>C, …
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Understanding variability in performance of type il cements: insights from Raman imaging
… (at 1, 3, 7, and 28 days of hydration), isothermal calorimetry, and rheology of fresh paste, with laser diffractometry, X-ray diffraction (XRD), and Raman imaging. A key contribution of the work is also the development of an automated Raman imaging algorithm that improves reproducibility …
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Predictive Modeling and Durability Analysis of Low Carbon Concrete Incorporating Recycled Materials
… combinations of CA and QB were examined using isothermal calorimetry, flow tests, pore solution composition analysis, and compressive strength tests at different curing ages. Of the above, a ternary blend with portland cement, high sulfur fly ash, and granite QB was found to perform best with …
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Properties of Western Cape concrete with metakaolin
… test, heat of hydration test (semi-adiabatic and isothermal calorimetry tests), and thermogravimetric analysis (TGA), iii) fresh properties of concrete assessed by setting time and workability, iv) hardened properties of concrete using compressive strength, tensile splitting strength, and porosity …
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