Sökning: "inorganic nitrogen"

Visar resultat 1 - 5 av 113 avhandlingar innehållade orden inorganic nitrogen.

1. 1. Synthesis and Characterization of Nitrogen-rich Calcium α-Sialon Ceramics

   Författare :Yanbing Cai; Saeid Esmaeilzadeh; Zhijian Shen; Elis Carlström; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nitrogen-rich; SiAlON; Sintering; Microstructure; Properties; Inorganic chemistry; Oorganisk kemi; oorganisk kemi; Inorganic Chemistry;

   Sammanfattning : In this thesis, a synthesis concept has been developed, which uses nitrogen-rich liquid phases for sintering of Ca-α-sialon ceramics. First, keeping the Si/Al ratios constant, the effects of N/O ratio on the properties and microstructure were investigated through a liquid phase sintering process. LÄS MER

3. 2. Preparation, characterization and properties of nitrogen rich glasses in alkaline earth-Si-O-N systems

   Författare :Ali Sharafat; Saeid Esmaeilzadeh; Stuart Hampshire; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Oxynitride glasses; glass forming region; nitrogen content; hardness; refractive index; Inorganic chemistry; Oorganisk kemi; oorganisk kemi; Inorganic Chemistry;

   Sammanfattning : Nitrogen rich glasses in the systems Ca-Si-O-N, Sr-Si-O-N and AE-Ca-Si-O-N (AE = Mg, Sr and Ba) have been prepared using a novel glass-synthesis route. The limits of the glass forming regions in the Ca and Sr systems and substitution limits in the AE-Ca-Si-O-N systems have been determined and physical properties of the glasses measured. LÄS MER

4. 3. Thin Film Synthesis of Nickel Containing Compounds

   Författare :Erik Lindahl; Jan-Otto Carlsson; Jens Birch; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemical Vapor Deposition; CVD; Atomic Layer Deposition; ALD; Nickel nitride; Nickel oxide; Nickel; Epitaxy; multilayer; Thin film; Inorganic chemistry; Oorganisk kemi; Inorganic Chemistry; Oorganisk kemi;

   Sammanfattning : Most electrical, magnetic or optical devices are today based on several, usually extremely thin layers of different materials.  In this thesis chemical synthesis processes have been developed for growth of less stable and metastable layers, and even multilayers, of nickel containing compounds. LÄS MER

5. 4. Preparation and characterisation of refractory whiskers and selected alumina composites

   Författare :Mats Carlsson; Mats Johnsson; Tor Grande; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; VLS-growth; Characterisation; Whiskers; Sintering; Ceramic composites; Inorganic chemistry; Oorganisk kemi;

   Sammanfattning : A whisker is a common name of single crystalline inorganic fibre of small dimensions, typically 0.5-1 μm in diameter and 20-50 μm in length. Whiskers are mainly used as reinforcement of ceramics. This work describes the synthesis and characterisation of new whisker types. LÄS MER

7. 5. A Theoretical Investigation of the Octapeptide Region in the Human Prion Protein

   Författare :Eva-Stina Riihimäki; Lars Kloo; José Manuel Martínez; Francisco Javier Luque Garriga; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; prion protein; copper; octapeptide; structure; force field parameters; coordination; non-periodic boundary conditions; Inorganic chemistry; Oorganisk kemi;

   Sammanfattning : Den kopparbindande egenskapen hos prionproteiner är sannolikt kopplad till proteinets funtion. Det mänskliga prionproteinet innehåller ett kopparbindande oktapeptidområde, där PHGGGWGQ-sekvensen upprepas fyra gånger i följd. LÄS MER