Sökning: "cellulose nanofibrils"

Visar resultat 16 - 20 av 81 avhandlingar innehållade orden cellulose nanofibrils.

1. 16. Bio-based preparation of nanocellulose and functionalization using polyelectrolytes

   Författare :Jonatan Henschen; Monica Ek; Josefin Illergård; Dongfang Li; Emily Cranston; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cellulose nanofibrils; cellulose nanocrystals; oxalic acid; polyvinylamine; layer by layer; cellulose oxalate; antibacterial; Cellulosa nanofibriller; cellulosa nanokristaller; oxalsyra; polyvinylamin; lager på lager; cellulosa oxalat; antibakteriell; Fiber- och polymervetenskap; Fibre and Polymer Science;

   Sammanfattning : Nanocellulosa, som kan utvinnas från skogsråvara, har de senaste åren fått mycket uppmärksamhet för sina intressanta egenskaper och breda användningsområde. Studierna i denna avhandling syftar till att vidga möjligheterna att använda nanocellulosa i olika applikationer. LÄS MER

3. 17. Porous Materials from Cellulose Nanofibrils

   Författare :Nicholas Tchang Cervin; Lars Wågberg; Björn Lindman; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Poröst material; cellulosa nanofibriller; Fiber- och polymervetenskap; Fibre and Polymer Science;

   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

4. 18. Two-dimensional Nanocomposites Based on Cellulose Nanofibrils and Graphene Oxide

   Författare :Hanieh Mianehrow; Lars Berglund; Aji Mathew; KTH; []
   Nyckelord :Cellulose nanofibrils; graphene oxide; orientation; reinforcement; oxygen barrier; bio-nanocomposite; moisture; molecular adhesion; interfacial shear strength.; Nanocellulosa; grafenoxid; orientering; förstärkning; syrebarriär; bionanokomposit; fukt; molekylär adhesion; skjuvhållfasthet hos gränsytan.; Fiber- och polymervetenskap; Fibre and Polymer Science;

   Sammanfattning : Two-dimensional (2D) nanocomposites based on cellulose nanofibrils (CNF) and 2D nanomaterials are of interest as sustainable materials combining functional and structural properties. To achieve reinforcement effects from 2D nanomaterials, their orientation and dispersion state in the CNF matrix are important. LÄS MER

5. 19. Functional Nanocellulose–Tannin Materials Inspired by Nature and Traditional Processes

   Författare :Konstantin Kriechbaum; Lennart Bergström; Alain Dufresne; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cellulose; Nanofibrils; Tannin; Biobased; Films; Foams; Moisture resistance; Energy efficiency; Materials Chemistry; materialkemi;

   Sammanfattning : Renewable and biodegradable alternatives to fossil-based materials are essential as concerns over depleting finite resources and the pollution of our ecosystems are growing. Abundant, highly anisotropic, and mechanically strong cellulose nanofibrils (CNF) are attractive building blocks for the fabrication of high-performance biobased materials that can compete with their conventional fossil-based counterparts. LÄS MER

7. 20. Tailored adhesion of PISA-latexes for cellulose modification and new materials

   Författare :Joakim Engström; Eva Malmström; Robert Pelton; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; PISA; latex; RAFT; Cellulose Nanofibrils; Cellulose Nanocrystals; Nanocomposites; Fiber- och polymervetenskap; Fibre and Polymer Science;

   Sammanfattning : This thesis is focused on applying modification chemistry to already known cellulosic substrates from wood (i.e. cellulose nanofibrils, CNFs, and cellulose nanocrystals, CNCs). LÄS MER