Search for dissertations about: "hydrofluoric acid"

Showing result 1 - 5 of 10 swedish dissertations containing the words hydrofluoric acid.

2. 1. Crystallization of Metal Fluoride Hydrates from Mixed Acid Solutions

   Author : Kerstin Forsberg; Åke Rasmuson; Alison Lewis; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; crystallization; crystal growth; b-FeF3.3H2O; iron fluoride trihydrate; CrF3.3H2O; pickling; pickle bath; hydrofluoric acid; nitric acid; stainless steel; Chemical engineering; Kemiteknik;

   Abstract : In this work crystal growth and nucleation of b-FeF3×3H2O and crystallization of chromium (III), iron (III) and nickel (II) fluoride hydrates from mixed acid (1-3 mol/kg HNO3 and 1-6 mol/kg free HF) have been investigated. The solubility of b-FeF3×3H2O has been determined in solutions of different hydrofluoric acid (1-7mol/ kg) and nitric acid (0-7mol/ kg) concentrations at 30, 40 and 50°C. READ MORE

4. 2. Integration of graphene into MEMS and NEMS for sensing applications

   Author : Xuge Fan; Frank Niklaus; Peter Steeneken; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Micro-electromechanical systems MEMS ; Nano-electromechanical systems NEMS ; heterogeneous 3D integration; Graphene; single-layer graphene; double-layer graphene; bilayer graphene; chemical vapor deposition CVD ; suspended graphene beams; suspended graphene membranes; doubly clamped; fully clamped; silicon on insulator SOI ; vapor hydrofluoric acid VHF ; Young’s modulus; built-in stress; built-in tension; piezoresistivity; gauge factor; accelerometer; resonators; electromechanical sensing; advanced transducers; humidity; gas sensing; sensitivity; CO2 sensing; graphene grain boundary; line defects; optical microscopy; wire bonding; Electrical Engineering; Elektro- och systemteknik;

   Abstract : This thesis presents a novel approach to integrate chemical vapor deposition (CVD) graphene into silicon micro- and nanoelectromechanical systems (MEMS/NEMS) to fabricate different graphene based MEMS/NEMS structures and explore mechanical properties of graphene as well as their applications such as acceleration sensing, humidity sensing and CO2 sensing. The thesis also presents a novel method of characterization of CVD graphene grain boundary based defects. READ MORE

5. 3. Modification of zeolites and synthesis of SAPO-templated carbon

   Author : Yunxiang Li; Niklas Hedin; Anders Palmqvist; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; microporous material; zeolite; SAPO templated carbon; hydrothermal synthesis; CVD; post modification; direct modification; snowflake; Materials Chemistry; materialkemi;

   Abstract : Zeolites are crystalline aluminosilicates with diverse structures and uniform porosities. They are widely used as catalysts, adsorbents and ion-exchangers in industry. Direct or post modifications optimize the performance of zeolites for different applications. In this thesis, IZM-2 and TON-type zeolites were synthesized, modified and studied. READ MORE

6. 4. Epidemiologic studies of health hazards related to the Swedish art glass industry

   Author : Gun Wingren; Linköpings universitet; []
   Keywords : MEDICINE; MEDICIN;

   Abstract : The production of glass began a few thousand years B. C. but was not introduced in Sweden until the 16th century. In general, throughout history, technical development has been rapid, but considering the art of glass blowing, methods used today are much the same as when the blowpipe was invented about 2 000 years ago. READ MORE

7. 5. Synthesis and characterization of Mo-based nanolaminates

   Author : Rahele Meshkian; Johanna Rosén; Árni Sigurður Ingason; Hans Högberg; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : Mn+1AXn (MAX) phases are nanolaminated compounds based on a transition metal (M), a group A element (A), and carbon or/and nitrogen (X), which exhibit a unique combination of ceramic and metallic properties. Mo-based MAX phases are among the least studied, despite indication of superconducting properties and high potential for fabrication of the grapheneanalogous 2D counterpart, Mo2C MXene. READ MORE