Sökning: "polar liquid crystals"

Visar resultat 6 - 10 av 12 avhandlingar innehållade orden polar liquid crystals.

1. 6. On the Optics and Surface Physics of Liquid Crystals

   Författare :Pontus Jägemalm; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; deformed helix; anchoring; short-pitch; SiO; homogeneous models; two-fold degenerate alignment; Berreman; bistable alignment; optical activity;

   Sammanfattning : Good knowledge about optics and surface physics of liquid crystals is indispensable when utilising them for applications, such as liquid crystal displays (LCDs). However, they are also two central subjects in fundamental research on liquid crystals. LÄS MER

3. 7. Liquid crystalline polymers for nonlinear optics : pyroelectric polymers and ferroelectric dendrimers

   Författare :Jonas Örtegren; KTH; []
   Nyckelord :;

   Sammanfattning : This thesis deals with liquid crystalline materialsincluding monomers, side-chain polymers, crosslinked polymers,and dendrimers. The materials are pyroelectric, meaning thatthere is a macroscopic electric polarization in the material,which is energetically stable in the absence of externalfields. LÄS MER

4. 8. PEG and lipids in solid dispersions and liquid crystals - structure and phase behaviour

   Författare :Johan Unga; Chalmers tekniska högskola; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; bicontinuous sponge phase; polyethylene glycol; monoolein; bicontinuous cubic phase; lipids; differential scanning calorimetry; phytantriol; small angle X-ray diffraction; solid dispersions;

   Sammanfattning : In this thesis, two different kinds of nano-structured systems have been studied; solid dispersion systems of polyethylene glycol (PEG) and liquid crystalline systems containing the polar lipids monoolein (MO) and phytantriol (PT). Solid dispersions of PEG were studied with addition of different substances, lipids or parabens. LÄS MER

5. 9. Lipid sponge phase nanostructures as carriers for enzymes

   Författare :Maria Valldeperas Badell; NanoLund: Centre for Nanoscience; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sponge phase; lipid liquid crystals; DGMO; GMO-50; polysorbate 80; encapsulation of proteins; Aspartic protease; β-galactosidase; X-ray and neutron scattering; Raman spectroscopy; adsorption; cryo-TEM;

   Sammanfattning : Nonlamellar lipid liquid crystalline phases have many potential applications, such as for drug delivery, protein encapsulation or crystallization. Lipid liquid crystalline sponge phase (L3) has so far not been very much considered in these applications, in spite of apparent advantages in terms of its flexibility and capacity of forming large aqueous pores able to encapsulate large bioactive molecules. LÄS MER

7. 10. Natural science specialising in physics

   Författare :Omaima Abubakr Elamain; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Liquid Crystal; Nematics; Bent Core Molecules; Electro-Optics; Biaxial; Flexoelectricity;

   Sammanfattning : A new class of liquid crystal materials has been recently discovered. These mate- rials are constituting of bent core (BC) molecules. LÄS MER