Sökning: "organiska lösningsmedel"

Visar resultat 1 - 5 av 42 avhandlingar innehållade orden organiska lösningsmedel.

1. 1. Recent Extraction Techniques with Emphasis on Supercritical Fluid Extraction and Microwave-assisted Extraction

   Författare :Cecilia Sparr Eskilsson; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Analytisk kemi; Analytical chemistry; Pressurized hot water extraction; Pressurized liquid extraction; Microwave-assisted extraction; Recent extraction techniques; Supercritical fluid extraction;

   Sammanfattning : Today’s requirements of fast, reliable and selective analytical methods with minimal usage of organic solvents have accelerated the development of new, automated extraction techniques. In this thesis recent extraction techniques with emphasis on supercritical fluid extraction (SFE) and microwave-assisted extraction (MAE) were investigated. LÄS MER

3. 2. Charge transport modulation in organic electronic diodes

   Författare :Fredrik Lars Emil Jakobsson; Magnus Berggren; Xavier Crispin; Paul W. M. Blom; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic electronics; switch device; memory; photochromic; trapping; resistance switching; Physics; Fysik;

   Sammanfattning : Since the discovery of conducting polymers three decades ago the field of organic electronics has evolved rapidly. Organic light emitting diodes have already reached the consumer market, while organic solar cells and transistors are rapidly maturing. One of the great benefits with this class of materials is that they can be processed from solution. LÄS MER

4. 3. Determination of Fat-Soluble Vitamins in Foods Based on Supercritical Fluid Extraction

   Författare :Charlotta Turner; Kemiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Supercritical fluid extraction; Solvent collection; Solid phase trapping; SFE; Selectivity; Retinol; Milk powder; Lipase; Food; Enzymatic hydrolysis; Alcoholysis; Candida antarctica; Tocopherol; Vitamins; Analytical chemistry; Analytisk kemi;

   Sammanfattning : Sample clean-up methodologies based on supercritical fluid extraction (SFE) have been developed for determination of fat-soluble vitamins in foods. This thesis focuses on method development, stressing important issues concerning sample pre-treatment, extraction conditions and collection parameters. LÄS MER

5. 4. Tools in biocatalysis : enzyme immobilisation on silica and synthesis of enantiopure amines

   Författare :Karim Engelmark Cassimjee; Per Berglund; Torkel Berglund; Torbjörn Gräslund; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : This thesis presents two techniques in the field of biocatalysis: An enzyme immobilisation method based on the His6-tag for attachment on modified silica oxide beads, and it’s employment in aqueous and organic medium for synthesis applications. The method functions as a one step extraction and immobilisation protocol. LÄS MER

7. 5. Multiphase Contamination in Rock Fractures : Fluid Displacement and Interphase Mass Transfer

   Författare :Zhibing Yang; Auli Niemi; Fritjof Fagerlund; Tissa Illangasekare; Insa Neuweiler; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; multiphase flow; dissolution; mass transfer; invasion percolation; immiscible displacement; fractured media; groundwater contamination; non-aqueous phase liquid; curvature; Hydrology; Hydrologi;

   Sammanfattning : Multiphase flow and transport in fractured rock is of importance to many practical and engineering applications. In the field of groundwater hydrology an issue of significant environmental concern is the release of dense non-aqueous phase liquids (DNAPLs) which can cause long-term groundwater contamination in fractured aquifers. LÄS MER