Sökning: "monodisperse spheres"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden monodisperse spheres.

1. 1. Harnessing Mesoporous Spheres - transport studies and biotechnological applications

   Författare :Jovice Boon Sing Ng; Lennart Bergström; Frank Caruso; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mesoporous; spheres; particles; CLSM; TEM; controlled-release; molecular transport; lipid membrane; enzyme; intraparticle; lipase; solid support; Inorganic chemistry; Oorganisk kemi; materialvetenskap; Materials Science;

   Sammanfattning : Applications in controlled release and delivery calls for a good understanding of molecular transport within the carrier material and the dominating release mechanisms. It is clear that a better understanding of hindered transport and diffusion of guest molecules is important when developing new porous materials, e.g. LÄS MER

3. 2. Salting-out of Colloidal Latex Particles Grafted with Poly(ethylene glycol)

   Författare :Kristin Jonsson; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; PEG; fluorinated colloids; monodisperse spheres; steric stability; emulsion polymerization; SAXS; crosslinking; salting-out; interfacial tension; SANS;

   Sammanfattning : Colloidal particles dispersed in a medium are important both in nature and in industry. The stability of colloidal particles is determined by the interactions between them and can be improved by steric stabilization. There is no conclusive understanding of how these sterically stabilized particles become unstable. LÄS MER

4. 3. A Waterborne Colloidal Model System Consisting of Fluorinated Spheres Bearing Grafted PEG: Synthesis, Characterization and Properties

   Författare :Jeanette Ulama; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; colloidal model system; steric stabilization; core-shell; poly ethylene glycol PEG ; heptafluorobutyl methactylate HFBMA ; fluorinated; polymer; phase behavior; short-range attractions; semi-batch emulsion polymerization; small angle X-ray scattering SAXS ; smearing effects; dynamic light scattering DLS ; cryogenic-transmission electron microscopy cryo-TEM ;

   Sammanfattning : Model systems have expanded our knowledge of numerous phenomena in Colloid Science, such as the appearance of glasses, order-disorder transitions involving crystals and attraction induced formation of gels. So far, the existing colloidal model systems have been limited mainly to nonaqueous media. LÄS MER

5. 4. Adsorption and Self-Assembly of Cationic Surfactants at Silica Surfaces

   Författare :Cecilia Ström; Fysikalisk kemi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; Fysikalisk kemi;

   Sammanfattning : The equilibrium self-assembly of cationic surfactants in bulk solution and at negatively-charged silica substrates is investigated experimentally and theoretically. The surfactants used are quaternary ammonium salts, both monovalent (DoTAB, TTAB, CTAB) and divalent (DoPPDAC). LÄS MER

7. 5. Mesostructured particulate silica materials with tunable pore size : Synthesis, characterization and applications

   Författare :Malin Helena Sörensen; Per Claesson; Viveka Alfredsson; KTH; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Mesoporous materials; aersol-based process; emulsion-based process; biocatalysis; sustained release; 3D hexagonal; 2D hexagonal; powder; spherical particles; liquid crystalline phases; AFM-porosimetry; Pluronic; Chemistry; Kemi;

   Sammanfattning : Colloidal assemblies of surfactants and polymers in aqueous solutions have been used by human mankind for hundreds of years and they are of great importance in many of our technological processes, such as fabrication of soap and papermaking. Less than two decades ago the idea of using colloidal assemblies as templates of inorganic materials was borne. LÄS MER