Search for dissertations about: "charge density"

Showing result 1 - 5 of 329 swedish dissertations containing the words charge density.

  1. 1. Flocculation with Polyelectrolytes in Latex and Microbial Systems

    University dissertation from Institute for Surface Chemistry, Box 5607, S-114 86 Stockholm, Sweden

    Author : Leif Eriksson; Lund University.; Lunds universitet.; [1997]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; floc strength; shear sensitivity; fractal dimension; floc structure; patch flocculation; adhesion; bridging; flocculation; charge compensation; adsorption; ionic strength; molecular weight; charge density; Cationic polyelectrolytes; latex; bacteria; activ; Physical chemistry; Fysikalisk kemi;

    Abstract : Adsorption of cationic polyelectrolytes onto polystyrene latices was studied as function of polymer chemical composition and molecular weight, polymer and surface charge density and ionic strength. The ratio between polymer charges and surface charges was close to one when distances between polymer and surface charges were equal. READ MORE

  2. 2. Exploring Dye-Sensitized Mesoporous NiO Photocathodes from Mechanism to Applications

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Lei Tian; Haining Tian; Leif Hammarström; Fabrice Odobel; [2020]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NiO; p-type; dye-sensitized solar cells; solid state; charge separation; charge recombination; charge diffusion; transport time; surface states; electron conductor; dye regeneration; Kemi med inriktning mot kemisk fysik; Chemistry with specialization in Chemical Physics;

    Abstract : Increasing attention has been paid on solar energy conversion since the abundant solar energy possesses the potential to solve the problems on energy crisis and climate change. Dye-sensitized mesoporous NiO film was developed as one of the attractive photocathodes to fabricate p-type dye-sensitized solar cells (p-DSCs) and dye-sensitized photoelectrosynthetic cells (p-DSPECs) for electricity and chemical fuels generation, respectively. READ MORE

  3. 3. Acceptor-doped barium zirconate: Oxidation, hydration and space-charge formation

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Anders Lindman; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; BaZrO3; space charge; point defects; oxidation; GW; hydration; density functional theory; grain boundaries; interatomic potential; perovskites;

    Abstract : The current production and use of fossil fuels is not sustainable and new technologies are needed to become more independent of these fuels.The hydrogen economy, with the fuel cell as an efficient converter of chemical to electrical energy, is a desirable alternative.For this to become a reality, new materials with tailored properties are required. READ MORE

  4. 4. Studies of Charge Transport and Energy Level in Solar Cells Based on Polymer/Fullerene Bulk Heterojunction

    University dissertation from Institutionen för fysik, kemi och biologi

    Author : Abay Gadisa; Linköpings universitet.; Linköpings universitet.; [2006]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Bulk heterojunction; Charge transport; Space charge limited; Bipolar transport; Origin of open circuit voltage; Polymer-fullerene blend; Soft contact lamination; Polarized infrared emission; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Abstract : π-Conjugated polymers have attracted considerable attention since they are potential candidates for various opto-electronic devices such as solar cells, light emitting iodes, photodiodes, and transistors. Electronic de vices based on conjugated polymers can be easily processed at low temperature using inexpensive technologies. READ MORE

  5. 5. Theoretical Modeling of Intra- and Inter-molecular Charge Transport

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Lili Lin; KTH.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; charge transport; molecular junction; organic molecular materials; Green s function; first-principles simulation; SRA - Transport; SRA - Transport;

    Abstract : This thesis focuses on theoretical study of charge transportproperties in molecular systems. The understanding of the transportprocess and mechanism in molecular systems is essential forthe design of new functional molecular materials and molecularelectronic devices. READ MORE