Sökning: "IR-spectroscopy"

Visar resultat 1 - 5 av 47 avhandlingar innehållade ordet IR-spectroscopy.

  1. 1. Ultrastructure of the Primary Cell Wall of Softwood Fibres Studied using Dynamic FT-IR Spectroscopy

    Författare :Jasna Stevanic Srndovic; Lars Wågberg; Per M. Claesson; Paul Gatenholm; KTH; []
    Nyckelord :AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; primary cell wall; polymer interactions; viscoelasticity; dynamic FT-IR spectroscopy; dynamic 2D FT-IR spectroscopy; cellulose; xyloglucan; pectin; protein; lignin; low degree sulphonation; cellulose allomorphs; Wood fibre and forest products; Träfiber- och virkeslära;

    Sammanfattning : The primary cell wall is a complex multipolymer system whose composite structure has been mostly determined from chemical and biochemical studies. Although the primary cell wall serves a central role, with regard to the connective properties of fibres, knowledge about the interactions among the polymers, when it comes to the mechanical properties, is very limited. LÄS MER

  2. 2. Dynamic FT-IR spectroscopy applied to studies on wood polymers

    Författare :Margaretha Åkerholm; KTH; []
    Nyckelord :Cellulose; Cooperation; Dynamic test; Glucomannan; Holocellulose; Spectroscopy; Kraft pulp; Mechanical properties; Orinettion; Picea Abies; Polarised light; Sulfite pulp; Xylan;

    Sammanfattning : .... LÄS MER

  3. 3. Synthesis and modification of potential CO2 adsorbents : Amine modified silica and calcium carbonates

    Författare :Baroz Aziz; Niklas Hedin; Lennart Bergström; Helmut Cölfen; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Amine-modified silica; carbon capture; Fractional factorial design; IR spectroscopy; calcium carbonate; Materials Chemistry; materialkemi;

    Sammanfattning : The prospect of rapid changes to the climate due to global warming is subject of public concern. The need to reduce the emissions of atmospheric green house gases and in particular carbon dioxide is greater than ever. Extensive research is performed to find new solutions and new materials, which tackles this problem in economically benign way. LÄS MER

  4. 4. Influence of cross-desorption during hydrogenation at transient conditions

    Författare :Lennart Cider; Chalmers University of Technology; []
    Nyckelord :IR spectroscopy; transient hydrogenation; French parking; acetylene; carbon monoxide; kinetics; ethylene;

    Sammanfattning : .... LÄS MER

  5. 5. Influence of waxes on bitumen and asphalt concrete mixture performance

    Författare :Ylva Edwards; Ulf Isacsson; Klaus-Werner Damm; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; bitumen; asphalt; additives; wax in bitumen; polyphosphoric acid in bitumen; rheology; IR-spectroscopy; dynamic mechanic analysis DMA ; bending beam rheometer BBR ; literature study; low temperature physical hardening; highway materials; morphology; modified bitumens; temperature susceptibility; low temperature performance; ageing; microscopy; chromatography; Fourier transform infrared spectroscopy; force ductility; conventional binder tests; asphalt performance; tensile strain restrained specimen test TSRST ; Building engineering; Byggnadsteknik;

    Sammanfattning : This doctoral thesis consists of a literature review, presented in two papers, and another six papers describing experimental studies of the influence of different kinds of wax and polyphosporic acid on bitumen and asphalt concrete mixture properties. The literature review should give an extensive description of the field of knowledge concerning wax in bitumen. LÄS MER