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Träfflista för sökning "WFRF:(Pettersson Erik) ;pers:(Pettersson Torbjörn)"

Sökning: WFRF:(Pettersson Erik) > Pettersson Torbjörn

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  • Ankerfors, Caroline, et al. (författare)
  • Use of polyelectrolyte complexes and multilayers from polymers and nanoparticles to create sacrificial bonds between surfaces
  • 2013
  • Ingår i: Journal of Colloid and Interface Science. - : Elsevier BV. - 0021-9797 .- 1095-7103. ; 391, s. 28-35
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study, particle polyelectrolyte complexes (PPECs) were formed by mixing cationic polyacrylamide (CPAM) and silica nanoparticles using the jet mixing technique. Within certain limits, the size of the formed PPECs could be controlled. The aim was to prepare PPECs with embedded sacrificial bonds, similar to those found in bones. Examination of PPEC adsorption to silica model surfaces indicated that,smaller PPECs adsorbed to a higher level than larger ones, due to the higher diffusion speed of smaller complexes. Adsorption studies of the same components as in the PPECs, but arranged in multilayers, that is, particle polyelectrolyte multilayers (PPEMs), indicated a stable, gradual build-up of material on the surface with smaller nanoparticles, whereas PPEMs comprising elongated nanoparticles appeared to be more loosely adsorbed onto the surface when the nanoparticles were in the outer layer, due to repulsive forces within the adsorbed layer. The AFM colloidal probe technique was used to study the interaction between surfaces treated with PPECs, multilayers, or polyelectrolyte complexes (PECs). The results showed that the expected long-range disentanglement could be achieved with PPECs but that the pull-off forces were generally low. Treatment with PPEMs comprising the same polymer and nanoparticle components produced higher pull-off values, together with disentanglement behaviour, possibly due to better contact between the surfaces. Adhesion experiments with polymer PECs showed significantly higher pull-off values than with the PPECs, probably due to polymer interdiffusion across the surface boundary.
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  • Gustafsson, Emil, et al. (författare)
  • Direct Adhesive Measurements between Wood Biopolyrner Model Surfaces
  • 2012
  • Ingår i: Biomacromolecules. - : American Chemical Society (ACS). - 1525-7797 .- 1526-4602. ; 13:10, s. 3046-3053
  • Tidskriftsartikel (refereegranskat)abstract
    • For the first time the dry adhesion was measured for an all-wood biopolymer system using Johnson-Kendall-Roberts (JKR) contact mechanics. The polydimethylsiloxane hemisphere was successfully surface-modified with a Cellulose I model surface using layer-by-layer assembly of nanofibrillated cellulose and polyethyleneimine. Flat surfaces of cellulose were equally prepared on silicon dioxide substrates, and model surfaces of glucomannan and lignin were prepared on silicon dioxide using spin-coating. The measured work of adhesion on loading and the adhesion hysteresis was found to be very similar between cellulose and all three wood polymers, suggesting that the interaction between these biopolymers do not differ greatly. Surface energy calculations from contact angle measurements indicated similar dispersive surface energy components for the model surfaces. The dispersive component was dominating the surface energy for all surfaces. The JKR work of adhesion was lower than that calculated from contact angle measurements, which partially can be ascribed to surface roughness of the model surfaces and overestimation of the surface energies from contact angle determinations.
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  • Pettersson, Torbjörn, et al. (författare)
  • JKR approach to study joint formation
  • 2010
  • Ingår i: ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY. ; , s. CELL-144-
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • To gain a more fundamental understanding of the mechanism for joint formation between pulp fibres, we have utilized the JKR approach to study the adhesion properties of multilayers formed using anionic and cationic MFC (microfibrillar cellulose). The effect of using anionic or cationic MFC in the outermost layer has been elucidated and compared with measurements performed on other types of cellulosic model surfaces. Furthermore, our JKR instrument has been modified to enable measurements of the drying process, by comparing the adhesion interaction between PVAm (poly[vinylamine]) coated surfaces that have been dried in contact, or dried before being brought into contact. The typical contact area in the JKR experiments are in the micrometre range and our measurements have been compared with nanoscale adhesion measurements by colloidal probe AFM (atomic force microscopy).
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  • Resultat 1-7 av 7

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