Sökning: "polyelektrolyter"

Visar resultat 1 - 5 av 21 avhandlingar innehållade ordet polyelektrolyter.

1. 1. Study of Paper Dry Strength Additives on Cellulose Fibres

   Författare :Mengxiao Zhao; Torbjörn Pettersson; Lars Wågberg; Leif Robertsén; Tekla Tammelin; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Paper dry strength additives; adsorption of polymer; polyelectrolyte; birch fibres; model cellulose surface; cellulose beads; filaments; light-weight paper board; polyacrylamide; cationic starch; Torrstyrkekemikalier; polymeradsorption; polyelektrolyter; cellulosafibrer; modellcellulosaytor; cellulosakulor; lättviktsliner; polyakrylamid; katjonstärkelse; Fiber- och polymervetenskap; Fibre and Polymer Science;

   Sammanfattning : Paper packaging is commonly found in the form of paper and cardboard boxes, but recently paper packing is being used in food packaging, trays, beverage packaging and even paper straws, among others. Paper strength additives have been developed to increase the efficiency of the joint strength and the joint areas and potentially maintain bulk in paper products. LÄS MER

3. 2. The Influence of Polyelectrolytes on the Stability of Colloids

   Författare :Lena Sjöström; Biofysikalisk kemi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; electrostatic interaction; charge reversal; colloid; asymmetric systems; electric double layer; polyelectrolyte; Monte Carlo; Physical chemistry; Fysikalisk kemi;

   Sammanfattning : The interaction between two colloids with grafted polyelectrolytes in aqueous solution is studied within the primitive model by Monte Carlo simulations. For neutral colloids with grafted polyelectrolytes and in absence of salt the interaction is strongly repulsive in absence of salt. LÄS MER

4. 3. Statistical Mechanical Studies of Titrating Polyelectrolytes

   Författare :Magnus Ullner; Kemiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; integral equation theory; variational calculations; Monte Carlo simulations; end-to-end separation; apparent dissociation constant; titrating polyelectrolytes; electrostatic interactions; Physical chemistry; Fysikalisk kemi;

   Sammanfattning : Different models and statistical mechanical approximations for titrating polyelectrolytes are studied and the results compared with Monte Carlo simulations and experimental data. Three types of models have been used in the simulations: i) rigid structures and freely jointed chains with ii) rigid bonds and iii) flexible, harmonic bonds. LÄS MER

5. 4. Utilizing Biopolymers in 3D Tumor Modeling and Tumor Diagnosis

   Författare :Negar Abbasi Aval; Torbjörn Pettersson; Aman Russom; Maria Tenje; KTH; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; 3D tumor modeling; Spheroids; Cellulose Nano Fibrils; Layer by Layer; Extracellular matrix; Circulating Tumor Capturing; Pancreatic ductal adenocarcinoma PDAC ; 3D-tumörmodellering; Sfärer; Cellulosa; Lager-på-lager; Extracellulärmatris; Infångning av cirkulerande tumörceller; Mänskliga Duktala Adenocarcinom-Hepatocyter; Fiber- och polymervetenskap; Fibre and Polymer Science;

   Sammanfattning : Cancer represents a significant global public health challenge and ranks as the second mostcommon cause of death in the United States. The onset of cancer entails an initial phasewhere cells lose their polarity and disconnect from the normal basement membrane, allowingthem to form distinct three-dimensional (3D) configurations that interact with adjacent cellsand the surrounding microenvironment. LÄS MER

7. 5. Bacterial adhesion to polyelectrolyte modified materials based on nanocellulose

   Författare :Jonatan Henschen; Lars Wågberg; Per Larsson; Josefin Larsson; Aji Mathew; Michael Malkoch; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Bacterial adhesion; cellulose nanofibrils; polymer adsorption; polyvinylamine; Fiber- och polymervetenskap; Fibre and Polymer Science;

   Sammanfattning : Since the introduction of materials based on cellulose nanofibrils (CNFs), these materials have been studied extensively and are suggested to be suitable for use in, for example, hygiene and health care products. A property not very well studied but that could further increase the usability of CNF products is the possibility of controlling bacterial adhesion to the materials. LÄS MER