Sökning: "dissolution rate."

Visar resultat 16 - 20 av 132 avhandlingar innehållade orden dissolution rate..

  1. 16. Aqueous Processing of WC-Co Powders Aqueous processing of WC-Co powders

    Författare :Karin Andersson; KTH; []
    Nyckelord :Hard metal; cemented carbide; WC-Co; tungsten oxide; tungsten carbide; oxidation; cobalt; dissolution; surface complexation; XPS; AFM; colloidal probe; force curve; Hamaker constant; Cauchy; WO3; CoOOH; CoO; Co3O4; ESCA; zeta-potential; surface poten;

    Sammanfattning : The object of this work is toobtain a fundamental understanding of the principal issuesconcerning the handling of WC-Co powders, in an aqueousmedium.The oxidation and dissolution oftungsten carbide powder dispersed in water was investigatedusing X-ray Photoelectron Spectroscopy (XPS) and leachingstudies. LÄS MER

  3. 17. Silicon nitride based coatings for biomedical implants

    Författare :Charlotte Skjöldebrand; Cecilia Persson; Håkan Engqvist; Julia Shelton; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; silicon nitride; ceramic coating; deposition; PVD; dissolution; biocompatibility;

    Sammanfattning : Silicon nitride-based coatings have been proposed as a means to reduce the release of metal ions and debris from metallic implants. This reduction in combination with the biocompatible debris from silicon nitride could result in a less adverse immune response. LÄS MER

  4. 18. Aqueous Processing of WC-Co Powders

    Författare :Karin M. Andersson; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hard Metal; Cemented Carbide; WC-Co; Tungsten Carbide; Cobalt; Oxidation; Dissolution; Surface Complexation; XPS; AFM; Colloidal Probe; Hamaker Constant; Cauchy; WO3; CoOOH; ESCA; Zeta-Potential; Surface Potential; Poly ethylene imine ; PEI; Suspensi;

    Sammanfattning : The object of this work is to obtain a fundamentalunderstanding of the principal issues concerning the handlingof an aqueous WC-Co powder suspension.The WO3 surface layer on the oxidised tungsten carbidepowder dissolves at pH>3 with the tungsten concentrationincreasing linearly with time. LÄS MER

  5. 19. Advanced Methods for Evaluation of the Performance of Complex Drug Delivery System

    Författare :Caroline Alvebratt; Christel Anna Sofia Bergström; Maria Strömme; Caitriona O'Driscoll; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; amorphous solid dispersion; coadministration; digestion; dissolution; drug absorption; enabling formulation; in vitro assay; lipid-based formulation; mesoporous carrier; supersaturation; Farmaceutisk vetenskap; Pharmaceutical Science;

    Sammanfattning : Low oral bioavailability of drugs originating from poor aqueous solubility is a common issue in drug development. Various enabling formulations have been presented to circumvent this limitation, many making use of supersaturation. In these, the drug is delivered to the gastro-intestinal lumen in a high energy state e.g. LÄS MER

  7. 20. Study on the Mechanisms for Corrosion and Hydriding of Zircaloy

    Författare :Magnus Oskarsson; KTH; []
    Nyckelord :Zircaloy; Zirconium alloys; Oxidation; Oxide layer; Pre-Transition; Hydriding; Pre-Hydrided; Hydrides; Lithium Hydroxide LiOH ; Lithiated water; Dissolution; Cross sectional TEM;

    Sammanfattning : This thesis is focused on the mechanisms for corrosion andhydriding of Zircaloy. Special attention is paid tomicrostructural characterisation by cross sectionaltransmission electron microscopy of the oxide layer formed. LÄS MER