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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 297 for “"Melting Point"”.
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Melting point depression in biodegradable polyesters
… into the crystallisation kinetics and melting point depression of poly(L-lactideco-meso-lactide) with approximately 3.3% D-lactide content (PLA 3051D) was undertaken. The rate of crystallisation was too slow for a crystallisation exotherm to be detected by the DSC, therefore hot-stage …
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The role of surfactants in the leaching of zinc sulphide minerals at temperatures above the melting point of sulphur
The role of the surfactants lignin sulfonic acid, cocoamido hydroxyl sulfobetaine (CAHSB), tallow amido hydroxyl sulfobetaine (TAHSB), cocoamido betaine (CAB), naphthalene sulfonic acid-formaldehyde condensates and orthophenylene diamine (OPD) in the liquid sulfur-aqueous zinc sulphate-zinc sulfide …
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Development of Pd(II)- and Pt(II)-based catalysts for polymerisation and oligomerisation of [alpha]-olefins
… investigated by DSC and TGA to determine their melting point endotherms and thermal stability. All polymers exhibited low thermal stabilities and low melting point endotherms.
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Packing of particles during softening and melting process.
… pressure, and bed composition (mono - single melting particles, including pure or blend particles vs binary two different melting point particles) on softening deformation are examined. The principal findings of this study are: 1. At low softening temperatures, an increase in load pressure …
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Synthesis of molten salt as heat transfer fluid for waste heat recovery application
… the physical and thermal properties based on low melting point and high thermal stability in order to be considered as heat transfer fluid in waste heat recovery applications. The nitrate based molten salt that has been use in this study consists of binary, ternary and quaternary salt mixture with …
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ΜΕΛΕΤΗ ΤΩΝ ΕΠΙΦΑΝΕΙΑΚΩΝ ΚΑΙ ΔΙΕΠΙΦΑΝΕΙΑΚΩΝ ΙΔΙΟΤΗΤΩΝ ΤΗΣ ΣΤΑΘΕΡΟΠΟΙΗΜΕΝΗΣ ΖΙΡΚΟΝΙΑΣ ΚΑΙ ΣΥΣΤΗΜΑΤΩΝ ΖΙΡΚΟΝΙΑΣ ΣΕ ΕΠΑΦΗ ΜΕ ΡΕΥΣΤΑ ΜΕΤΑΛΛΑ
… SYSTEMS VARY IN A RESTRICTED REGION ABOUT THE MELTING POINT OF THE METALS. THE MEAN VALUE IS GIVEN AS ΓSL=1.616 Z.M-2. SURFACE-DIFFUSION COEFFICIENTS AND ACTIVATION ENERGIES OF ZVO2 WERE CALCULATED. THE SURFACE ENERGY OF THE ZRO2 AT ROOM TEMPERATURE WASDETERMINED USING THE "VICKERS INDENTATION …
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Increasing Cermet Fuel Thermal Margin with Thoria for Nuclear Thermal Propulsion
… were considered by improving the fuel margin to melting point. A thorium-dioxide stabilized, high-assay low enriched uranium (HALEU) tungsten-uranium dioxide (W-UO2) CERMET fueled nuclear thermal propulsion (NTP) concept was produced based on the Space Capable Cryogenic Thermal Engine (SCCTE) …
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Thermal Properties of Indium Nanoparticles and Gold Silicide Formation by Scanning Nanocalorimetry
… films. The unique finding is to determine the melting temperature of metastable phase using calorimetry, which is ∼60°C below the eutectic melting point (363°C). The heat of fusion (26.4 kJ/mol) of the metastable phase has also been obtained. The metastable phase is analyzed to be …
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Heat Transfer Enhancement of Phase Change Materials for Thermal Energy Storage Systems
… selected types of PCMs are paraffin waxes with melting point temperatures of 28-72◦C. In an effort to study both convective and conductive heat transfer enhancement the experimental analysis has been divided into two phases. In the first analysis, silicone oil is selected as a heat transfer …
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Minority carrier lifetimes in germanium on silicon heterostructures
… that recrystallization using RTAs below the Ge melting point and liquid phase epitaxy using RTAs above the Ge melting point resulted in recrystallized poly-Ge with varying degrees of defects. Epi-Ge resulted in the highest level of coherent crystallinity. Inductively-coupled photoconductance …
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Fabrication of metallic nanostructures from sputtered nanocluster precursors
… have been explored to exploit the depressed melting point effect that small clusters exhibit to fabricate integrated circuit components. These techniques have only been attempted with colloidal solutions of passivated nanoclusters. The purpose of this thesis is to undertake an investigation …
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Strategies to influence temperature stability of dark chocolate in tropical regions
… sensory characteristics. Fat bloom formation and melting point are challenging to control in the chocolate industry, especially in tropical regions. Tempering, is the process where chocolate obtains the appropriate polymorphic form in cocoa butter (form V) which influences important physical and …
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Processing and properties of composites based on high density polyethylene and thermotropic liquid crystalline polymers
… molding at temperatures above the matrix melting point, but below the TLCP melting point, microcomposites were obtained. Microcomposites generated at the lowest temperatures had higher tensile properties than found for in situ composites and similar to glass reinforced HDPE. At 170°C the …
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Transient liquid-phase infiltration of a powder-metal skeleton
… composed of the skeleton material plus a melting point depressant in order to facilitate homogenization after the liquid metal fills the void space. Parts over 20 cm tall with final compositions of Ni-4wt%Si and Ni-40wt%Cu were made by TLI from powder skeletons of pure nickel. Tensile …
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The measles defect in CA-15 alloy steel castings
… was found that samples heated to 50°C below the melting point in an oxidizing atmosphere showed the characteristic measles defect encountered in casting CA-15 alloy in green sand molds. Samples melted, cooled to 50°C below the melting point, and held at that temperature in an oxidizing atmosphere …
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Macrocyclic Monomers: Synthesis, Characterization and Ring-opening Polymerization
… controlled. Several factors determine the melting points of individual macrocycles. The first factor is the ring size. A series of cyclic monomers for poly(ether ether ketone)s were synthesized and isolated. The melting point decreases as ring size increases. Single crystal X-ray structural …
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End-of-life analysis of nanotechnology products
… shown that thermodynamic properties including melting point and specific heat capacity of nanomaterials may be higher than that of their corresponding bulk materials. The melting point elevation and specific heat capacity enhancement of nanomaterials may result in increased energy consumption …
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An investigation of the effect of cryoprotective agents on intermolecular disulfide formation
… bond formation is detected by an increase in the melting point of the gel (13). According to the sulfhydryl hypothesis any substance which would decrease the rate of disulfide bond formation as shown by prevention of a rise in the melting point of the Thiogel would presumably also protect proteins …
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Structure-property relationships of novel cellulose esters
… the C₁₂ - C₁₄ waxy tri-esters revealed separate melting transitions (T<sub>m,L</sub> and T<sub>m, H</sub>) for ester substituents and main cellulose chains, providing evidence for the existence of a separate (crystalline) phase formed by the ester substituents. Main-chain T<sub>mS</sub> of waxy …
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