Search for dissertations about: "clathrate"

Showing result 1 - 5 of 11 swedish dissertations containing the word clathrate.

  2. 1. New Materials for Environmental Applications:Thermoelectrics and Low-Temperature Oxidation Catalysts

    Author : Ali Saramat; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; selective oxidation; Czochralski; YMn4Al8; clathrate; heterogeneous catalysis; thermoelectricity; noble metals; mesoporous; phonon glass-electron crystal; figure-of-merit ZT ;

    Abstract : New materials have been researched for environmental applications as thermoelectrics and low-temperature oxidation catalysts. One of the main objectives of this thesis was to prepare and characterize new efficient thermoelectric materials (TM’s). READ MORE

  4. 2. Pressure-Induced Amorphization and Distinct Amorphous States of Clathrate Hydrates

    Author : Paulo H. B. Brant Carvalho; Ulrich Häussermann; Ove Andersson; John Stephen Loveday; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Clathrate Hydrates; Pressure-Induced Amorphization; Amorphous States; Glassy States; Ice; Neutron Diffraction; Klatrathydrater; Tryckinducerad Amorfisering; Amorfa tillstånd; Glasartade tillstånd; Is; Neutrondiffraktion; Physical Chemistry; fysikalisk kemi;

    Abstract : This thesis summarizes a study on the pressure-induced amorphization (PIA) and structures of amorphous states of clathrate hydrates (CHs).PIA involves the transition of a crystalline material into an amorphous solid in response of mechanical compression at temperatures well below the melting point. READ MORE

  5. 3. Synthesis of Nanostructured Thermoelectric Materials

    Author : Ali Saramat; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; microemulsion; figure-of-merit ZT ; nanostructured; thermal conductivity; clathrate; top seeded solution growth TSSG ; thermoelextricity; Czochralski; Seebeck coefficient; electrical resistivity; skutterudite; phonon glass-electron crystal PCEC ;

    Abstract : .... READ MORE

  6. 4. Theoretical Studies of Natural Gas Hydrates and H-bonded Clusters and Crystals

    Author : Yuan Liu; Lars Ojamäe; Per-Olov Käll; Ben Slater; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : In this thesis H-bonded systems (natural gas hydrates, water clusters, and crystal ice) are studied by density functional theory (DFT) computations.Natural gas hydrates (NGHs) play an important role in energy and environmental fields: NGHs are considered as a promising backup energy resource in the near-future due to their tremendous carbon content; improper exploration of NGHs could induce geological disasters and aggravate the greenhouse effect. READ MORE

  7. 5. Improving Thermoelectric Properties of Inorganic Clathrates by Atomic and Microscale Structure Engineering

    Author : Yifei Zhang; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Crystal structure; Thermoelectrics; Chemical ordering; Microstructure; Clathrates; Thermal properties; Electrical transport properties;

    Abstract : As more countries are aiming for a carbon-neutral economy, technologies that utilize renewable energies are increasingly being considered. Thermoelectric materials enable the direct conversion between a thermal gradient and an electrical potential gradient, and are thus exploited for applications such as waste heat recovery. READ MORE