Sökning: "carboxylic groups"

Visar resultat 1 - 5 av 75 avhandlingar innehållade orden carboxylic groups.

  1. 1. Molecular Insight into Ion-Specific Interactions : Vibrational Sum Frequency Study of the Carboxylic Acid Moiety

    Författare :Adrien Sthoer; Eric Tyrode; Paul Cremer; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; specific ion effects; carboxylic acid; fatty acid Langmuir monolayer; vibrational sum frequency spectroscopy; VSFS; Electrical double layer;

    Sammanfattning : Ion specific effects at charged interfaces find numerous applications in colloidal sciences and play a vital role in many biological processes. Despite having been studied for over a century, starting with the work of F. Hofmeister in the 1880s, a comprehensive molecular  understanding remains elusive. LÄS MER

  3. 2. Wetting and swelling of modified cellulose fibers

    Författare :Fredrik Gellerstedt; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; carboxylic groups; acrylic acid; chemithermomechanical pulps; chemical pulps; pH; succinic anhydride; grafting; esterification; wetting; swelling;

    Sammanfattning : .... LÄS MER

  4. 3. Quantitative in situ analysis of initial atmospheric corrosion of copper induced by carboxylic acids

    Författare :Harveth Gil; Christofer Leygraf; Mark Rutland; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Atmospheric corrosion; carboxylic acids; copper; in situ; IRAS; QCM; coulometric reduction.; Chemistry; Kemi;

    Sammanfattning : The interaction of carboxylic acids with copper is a phenomenon found both outdoors and, more commonly, indoors. The influence on copper of some carboxylic acids (formic, acetic, propionic, and butyric) have so far been studied at concentrations levels at least three or four orders of magnitude higher than actual indoor conditions (< 20 ppb, volume parts per billion), and with only limited emphasis on any mechanistic approach. LÄS MER

  5. 4. Aqueous surface chemistry of Goethite : adsorption and desorption reactions involving phosphate and carboxylic acids

    Författare :Malin Lindegren; Per Persson; Staffan Sjöberg; Alan Stone; Umeå universitet; []
    Nyckelord :;

    Sammanfattning : Phosphorus is an essential element for all known forms of life. In the form of phosphate, this nutrient is retained in soils and sediments by sorption on mineral particles, clays and other soil constituents. LÄS MER

  7. 5. Fenton Pre-treatment of a Birch Kraft Pulp for MFC preparation

    Författare :Pia Hellström; Helena Håkansson; Anette Heijnesson Hultén; Magnus Paulsson; Monica Ek; Karlstads universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Microfibrillated cellulose; Fenton chemistry; carbonyl groups; surface charge; total charge; Enzymatic hydrolysis; Tensile strength; z-directional strength; Chemical Engineering; Kemiteknik;

    Sammanfattning : The potential to use acidic hydrogen peroxide in the presence of ferrous ions (Fenton’s reagent) as a pre-treatment when producing microfibrillar cellulose (MFC) from a fully bleached birch (Betula verucosa) kraft pulp was investigated and the properties of the produced MFC was compared to the properties of a MFC produced with enzymatic pre-treatment with a monocomponent endoglucanase (FiberCare® R). The mechanical treatment to MFC was performed in a laboratory colloid mill or in a pilot high-pressure homogeniser and the pre-treated pulps as well as the produced MFCs were chemically and morphologically characterised. LÄS MER