Sökning: "contact angle cellulose"
Visar resultat 6 - 10 av 21 avhandlingar innehållade orden contact angle cellulose.
6. Fiber-Supported Hydrogels with Controlled surface Properties
Sammanfattning : Hydrogels are emerging materials that have the ability to hold a substantial amount of water. However, the low mechanical performance of hydrogels is often a limitation for extending the field of applications. LÄS MER
7. Betulin-modified cellulosic textile fibers with improved water repellency, hydrophobicity and antibacterial properties
Sammanfattning : Textiles made from natural sources, such as cotton and flax, have advantages over those made of synthetic fibers in terms of sustainability. Unlike major synthetic fibers that have a negative impact on the environment due to poor biodegradability, cotton cellulose is a renewable material. LÄS MER
8. Porous Materials from Cellulose Nanofibrils
Sammanfattning : In the first part of this work a novel type of low-density, sponge-like material for the separation of mixtures of oil and water has been prepared by vapour deposition of hydrophobic tri-chloro-silanes on ultra-porous cellulose nanofibril (CNF) aerogels. To achieve this, a highly porous (>99%) robust CNF aerogel with high structural flexibility is first formed by freeze-drying an aqueous suspension of the CNFs. LÄS MER
9. Preparation, characterisation and wetting of fluorinated cellulose surfaces
Sammanfattning : This thesis deals with the wetting by oil mixtures of two different model cellulose surfaces. The surfaces studied were a regenerated cellulose (RG) surface prepared by spin-coating, and a film consisting of polyelectrolyte multilayers (PEM) of Poly(ethyleneimine) (PEI) and a carboxymethylated Microfibrillated Cellulose (MFC). LÄS MER
10. Tailoring adhesion and wetting properties of cellulose fibers and model surfaces
Sammanfattning : The layer-by-layer (LbL) technique was used to modify the surface of cellulose fibers by consecutive adsorption of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) followed by a final adsorbed layer of anionic paraffin wax colloids. Paper hand sheets made from the modified fibers were found to be highly hydrophobic with a contact angle of 150°. LÄS MER