Sökning: "dissolution-precipitation"

Visar resultat 1 - 5 av 9 avhandlingar innehållade ordet dissolution-precipitation.

  1. 1. Porous Polymeric Monoliths by Less Common Pathways : Preparation and Characterization

    Författare :Ahmed Elhaj; Knut Irgum; Sebastiaan Eeltink; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Monolith; commodity polymer; thermally induced phase separation; dissolution-precipitation; polymer solvents; porogenic polymer; step-growth polymerization; separation science; melamine-formaldehyde;

    Sammanfattning : This thesis focuses on my endeavors to prepare new porous polymeric monoliths that are viable to use as supports in flow-through processes. Polymer monoliths of various porous properties and different chemical properties have been prepared utilizing the thermally induced phase separation (TIPS) phenomenon and step-growth polymerization reactions. LÄS MER

  3. 2. New approaches to preparation of macroporous monoliths for use in liquid chromatography

    Författare :Anh Mai Nguyen; Knut Irgum; Tatiana B. Tennikova; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; monolith; polycondensation; dissolution-precipitation; epoxy-amine; poly-amide; nylon; emulsion polymerization; characterization; protein separation; liquid chromatography; Analytical chemistry; Analytisk kemi; analytisk kemi; Analytical Chemistry;

    Sammanfattning : High performance liquid chromatography (HPLC) is one of the major techniques in separat-ion sciences. Faster separation and higher efficiency are required to meet ever-growing demands. Despite numerous studies and achievements on improving mass transfer in particulate packings discontinuity seems to be the cornerstone drawback in their development. LÄS MER

  4. 3. Starch stabilized Pickering emulsions : Colloidal starch particles and their effects on emulsion properties

    Författare :Hisfazilah Saari; Avdelningen för livsmedel och läkemedel; []
    Nyckelord :Starch granules; Pickering emulsions; colloidal particles; sedimentation; acid hydrolysis; cold gelatinization; dissolution; non-solvent precipitation; nanoparticles;

    Sammanfattning : Particles can be used to stabilize multi-phase systems known as Pickering emulsions. The aim of this thesis was to investigate how starch particles affect emulsion properties. Starch granules were used individually as well as in binary mixtures. LÄS MER

  5. 4. Bone tissue regeneration indento-alveolar surgery : clinical and experimental studies on biomaterials and bone graft substitutes

    Författare :Annika Sahlin-Platt; Maria Ransjö; Christer Dahlin; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Biomaterials; bone graft substitutes; compomer; root end filling; Bio-Oss; Bioactive glass 45S5; Algipore; SEM EDAX; ICP-OES; Cryo-XPS;

    Sammanfattning : Pathological processes in the alveolar and facial bones can lead to bone loss that may not heal with complete regeneration. Biomaterials can be used to facilitate the healing process and/or as a bone substitute, but the mechanisms are not fully understood. LÄS MER

  7. 5. Biological interface of bone graft substitute materials : experimental studies on interactions between biomaterials and bone cells

    Författare :Zivko Mladenovic; Maria Ransjö; Joost D de Brujin; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

    Sammanfattning : Bone graft substitute materials are becoming more common as alternative therapy strategies when bone defects in patients need to be treated. The interaction between bone cells and biomaterials occur at the surface of the materials. A great deal is known about the importance of surface topography and physic-chemical properties of biomaterials. LÄS MER