Sökning: "aerogel"

Visar resultat 6 - 10 av 20 avhandlingar innehållade ordet aerogel.

1. 6. Nanofiber networks, aerogels and biocomposites based on nanofibrillated cellulose from wood

   Författare :Houssine Sehaqui; Lars A. Berglund; Ton Peijs; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nanofibrillated cellulose; nanopaper; nanofiber; biocomposites; aerogel; foam; Materials science; Teknisk materialvetenskap;

   Sammanfattning : Nanofibrillated cellulose (NFC) from wood is an interesting material constituent of high strength and high aspect ratio, which easily forms networks through interfibril secondary bonding including hydrogen bonds. This has been exploited in preparation of new materials, which extend the range of properties for existing cellulosic materials. LÄS MER

3. 7. Novel Thermal Insulation in Future Building and District Heating Applications - Hygrothermal Measurements and Analysis

   Författare :Axel Berge; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vacuum insulation panels; superinsulation; aerogel blankets; wooden stud walls; thermal conductivity; district heating;

   Sammanfattning : The interest for reducing the energy consumption in society has increased during the last decades due to an increased environmental awareness. One way to decrease the energy losses in the building sector is to improve the thermal insulation of building envelopes and installations and thereby decrease the heat losses. LÄS MER

4. 8. A scalable furnace technique to grow silicon nanoparticles for high-performance Li-ion battery anodes

   Författare :Rohan Patil; Jonas Örtegren; Shizhao Xiong; Mittuniversitetet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Li Ion Battery; Aerogel-Based Anodes; Novel Method; silicon nanoparticles; Nanographite; High Capacity;

   Sammanfattning : Lithium-ion batteries are one of the key technologies to address the global climate challenge. Higher battery capacity could also be seen as indirectly influencing the entire value chain. One way to increase capacity is to add silicon to the graphite anode, since silicon can store much more lithium ions than graphite. LÄS MER

5. 9. Chemical Modification of Nanostructured Wood for Functional Biocomposites

   Författare :Shennan Wang; Qi Zhou; Gustav Nyström; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wood; nanostructured materials; nanocellulose; delignification; oxidation; crosslinking; amination; MOFs; transparent film; hydrogel; aerogel; biocomposites; mechanical properties; thermochromic materials; CO2 capture; protein immobilization.; Biotechnology; Bioteknologi;

   Sammanfattning : Recently emerged top-down processing concept has provided new insights into the chemical modification of wood at the nanoscale. Nanostructured wood with naturally aligned cellulose microfibrils, cell wall nanoporosity, and precisely tuned chemical composition has opened up numerous possibilities for advanced design of functional materials. LÄS MER

7. 10. Porous Cellulose Materials from Nano Fibrillated Cellulose

   Författare :Nicholas Cervin; Lars Wågberg; Monica Ek; Charlotta Hanson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   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 silanes on ultra-porous nanocellulose aerogels. To achieve this, a highly porous (> 99 %) nanocellulose aerogel with high structural flexibility and robustness is first formed by freeze-drying an aqueous dispersion of the nanocellulose. LÄS MER