Author: Bernd HerzogPublisher:
ISBN:
Category :
Languages : en
Pages : 148
Book Description
Light Scattering Studies on Polyelectrolytes and on Ionic Micellar Systems
Author: Bernd HerzogDynamic Light Scattering Studies of Macromolecular and Micellar Systems
Author: Alan FlambergAn Improved Form for the Electrostatic Interactions of Polyelectrolytes in Solution and Its Implications for the Analysis of QELSS Experiments in Sodium Dodecyl Sulfate and Cetyl Trimethyl Ammonium Bromide
Author: Nicholas V. SushkinPublisher: Universal-Publishers
ISBN: 1581120087
Category : Science
Languages : en
Pages : 155
Book Description
The electrostatic interaction between two charged spheres in the presence of a screening electrolyte is calculated at the level of the linearized Debye-Hückel theory. The calculation is performed analytically as a multipole expansion by applying two-center spherical harmonic expansions and symbolic manipulation methods. I focus on charge-charge and charge-induced dipole interactions, calculated for two spheres of possibly unequal size. The former interaction is given to good approximation by the familiar Debye-Hückel form q1q2exp[-k(R-2a)]/[(epsilon*r(1]ka)^2]. The new results are the charge-induced dipole interactions. Physically, these terms arise from two sources: (i) surface polarization charge at the surface of each sphere, and (ii) exclusion of the counterion cloud of each sphere from the volume occupied by the other sphere. With parameters appropriate for micelles, the charge-induced dipole interactions dominate the charge-charge interaction at small separations. Quasi-elastic light scattering measurements of the diffusion of sodium dodecyl sulfate (SDS) and cetyl trimethyl ammonium bromide (CTAB) micelles in aqueous solutions, and the diffusion of mesoscopic optical probes through the same solutions, were carried out at 35°C and multiple solvent ionic strengths. Assuming a spherical micelle, I deduced the micelle radius, aggregation number, charge, and hydration from nonlinear least-squares fits to both probe and mutual diffusion data. For SDS micelles the charge that I find is lower than reported in the literature [Hayter, J. B.; Penfold, J. Colloid & Polymer Science 1983, 261, 1022; Triolo, R.; Caponetti, E.; Graziano, V. J. Phys. Chem. 1985, 89, 5743.] because I used an improved functional form of the micellar electrostatic interaction. I find a smaller aggregation number and a larger micellar hydration than literature values. My analysis of CTAB data implies extensive micellar growth, and failure of the spherical micelle assumption.
Light Scattering Studies on Polyelectrolytes
Author: Marshall Raymond HatfieldPublisher:
ISBN:
Category :
Languages : en
Pages : 3
Book Description
Light Scattering from Polymer Solutions and Nanoparticle Dispersions
Author: Wolfgang SchärtlPublisher: Springer Science & Business Media
ISBN: 3540719512
Category : Technology & Engineering
Languages : en
Pages : 200
Book Description
Light scattering is a very powerful method for characterizing the structure of polymers and nanoparticles in solution. As part of the Springer Laboratory series, this book provides a simple-to-read and illustrative textbook probing the seemingly very complicated topic of light scattering from polymers and nanoparticles in dilute solution, and goes further to cover some of the latest technical developments in experimental light scattering.
Fluorescence Studies of Polymer Containing Systems
Author: Karel ProcházkaPublisher: Springer
ISBN: 3319267884
Category : Science
Languages : en
Pages : 306
Book Description
This volume describes the application of fluorescence spectroscopy in polymer research. The first chapters outline the basic principles of the conformational and dynamic behavior of polymers and review the problems of polymer self-assembly. Subsequent chapters introduce the theoretical principles of advanced fluorescence methods and typical examples of their application in polymer science. The book closes with several reviews of various fluorescence applications for studying specific aspects of polymer-solution behavior. It is a useful resource for polymer scientists and experts in fluorescence spectroscopy alike, facilitating their communication and cooperation.
Data Evaluation in Light Scattering of Polymers
Author: Martin HelmstedtPublisher: John Wiley & Sons
ISBN: 9783527301416
Category : Science
Languages : en
Pages : 346
Book Description
This book is based on lectures and posters presented at the workshop "Data Evaluation in Light Scattering of Polymers"held in Bad Schandau, Germany. The articles cover a broad range of applications including basic research studies on complex polymeric systems as well as routine measurements and provide a survey of novel data evaluation schemes mostly developed during the last decade. Additionally, this issue contains contributions dealing with novel and / or highly specialized light scattering experiments and with the combination of light scattering instruments with other experimental techniques.
Exploratory Light Scattering and Viscosity Studies of Polyelectrolytes, Polysoaps, and Related Polymers Prepared from P-sulfonamidostyrene and P-n Alkylstyrenes
Author: Jack DicksteinLight-scattering Studies on the Polymer and Polyelectrolyte from 2-vinyl Pyridine
Author: Robert B. TaylorLight-scattering and viscosity studies of a polyelectrolyte and
Author: Bernard Leo WilliamsPublisher:
ISBN:
Category :
Languages : en
Pages : 292
Book Description