Laser Light Scattering

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Laser Light Scattering

01 Jan 1974-

About: The article was published on 1974-01-01 and is currently open access. It has received 1184 citations till now. The article focuses on the topics: Multiangle light scattering & Light scattering.

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Book Chapter•DOI•

Volume phase transition and related phenomena of polymer gels

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Mitsuhiro Shibayama¹, Toyoichi Tanaka¹•Institutions (1)

Massachusetts Institute of Technology¹

01 Jan 1993

TL;DR: A review of the recent advances in studies of the volume phase transition and critical phenomena of polymer gels mostly carried out in our group from 1973 to the present can be found in this article.

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Abstract: This review covers the recent advances in studies of the volume phase transition and critical phenomena of polymer gels mostly carried out in our group from 1973 to the present. We aimed here to discuss intensively (i) the basic understanding of the transition from the viewpoints of structure, dynamics, kinetics, and equilibrium thermodynamics, (ii) technological applications of the volume transition, and (iii) the relation between the phase transition and biological interactions.

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742 citations

Book Chapter•DOI•

Static and dynamic light scattering from branched polymers and biopolymers

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Walther Burchard¹•Institutions (1)

University of Freiburg¹

01 Jan 1983

TL;DR: In this paper, the authors deal with branched macromolecules in dilute solution, where the individual molecules are observed, and the common technique for determining the shape of macromoles is static light scattering.

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Abstract: The striking properties of synthetic polymers and biological macromolecules are largely determined by their shape and the internal mobility. Both quantities are closely related to the architecture of the molecules. This article deals with branched macromolecules in dilute solution, where the individual molecules are observed. The common technique for determining the shape of macromolecules is static light scattering. Information on the internal mobility and the translational motion of the mass centre can be obtained from the more recent technique of quasi-elastic or dynamic light scattering.

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614 citations

Journal Article•DOI•

Microrheology of complex fluids

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Thomas A. Waigh¹•Institutions (1)

University of Leeds¹

09 Feb 2005-Reports on Progress in Physics

TL;DR: The field of microrheology is concerned with how materials store and dissipate mechanical energy as a function of length scale as mentioned in this paper, and it has been extensively studied in the literature.

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Abstract: The field of microrheology is concerned with how materials store and dissipate mechanical energy as a function of length scale. Recent developments in the theory and instrumentation of the microrheology of complex fluids are reviewed. Equal emphasis is given to the physical phenomena probed, advances in instrumentation, and specific experimental systems in which this field has already had an impact. The inversion of the compliance data, measurement of sample heterogeneity, high frequency viscoelasticity, effects of shear flow, single molecule experiments, surface viscoelasticity and time evolution studies are considered. The techniques highlighted include particle tracking microrheology, diffusing wave spectroscopy, laser tracking, magnetic tweezers and atomic force microscopy. Specific examples of complex fluid systems are chosen from the fields of polymers, colloids and biological assemblies.

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591 citations

Journal Article•DOI•

Globule-to-Coil Transition of a Single Homopolymer Chain in Solution

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Chi Wu¹, Chi Wu², Xiaohui Wang²•Institutions (2)

University of Science and Technology of China¹, The Chinese University of Hong Kong²

04 May 1998-Physical Review Letters

TL;DR: In this article, a nearly monodisperse high molar mass poly( $N$-isopropylacrylamide) (PNIPAM) sample was used to study the globule-to-coil transition of a single homopolymer chain in solution.

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Abstract: Using a nearly monodisperse high molar mass poly( $N$-isopropylacrylamide) (PNIPAM) sample, we successfully made the conformation change of individual PNIPAM chains from a coil to a fully collapsed stable single chain globule in an extremely dilute aqueous solution, which enabled us to study for the first time the globule-to-coil transition of a single homopolymer chain in solution. A comparison to the coil-to-globule and the globule-to-coil transitions revealed a hysteresis in the globule-to-coil transition. Our results also confirmed the existence of two additional thermodynamically stable states between the coil and the globule states, namely, the crumpled coil and the molten globule.

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555 citations

Cites methods from "Laser Light Scattering"

...In dynamic LLS [18], the cumulant analysis of the measured intensity-intensity time correlation functio G2std of a nearly monodisperse PNIPAM sample was sufficient for an accurate determination of the averag linewidth skGld which can be related to the average tran sitional diffusion coefficientskDld and the average hydrodynamic radiusskRhld by kDl skGlyq2dq!...
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...The LLS instrumentation has been detailed before [16]....
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...In static LLS [17], we were able to obtain both the weight-average molecular massMwd and the average radius of gyrationskRgld of polymer chains in an extremely dilute solution from the angular dependence of the ex cess absolute scattering intensity, known as Rayleigh r tio Ryysqd, where q s4pnyl0d sinsuy2d, with n, l0, and u being the solvent refractive index, the wavelength of the light in vacuum, and the scattering angle, respe tively....
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...The solution was clarified by a 0.5mm Millipore Millex-LCR filter prior to laser light scattering (LLS) experiments....
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...In static LLS [17], we were able to obtain both the weight-average molecular mass Mwd and the average radius of gyrationskRgld of polymer chains in an extremely dilute solution from the angular dependence of the ex cess absolute scattering intensity, known as Rayleigh r tio Ryysqd, where q s4pnyl0d sinsuy2d, with n, l0, and u being the solvent refractive index, the wavelength of the light in vacuum, and the scattering angle, respe tively....
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Journal Article•DOI•

Dynamic Light Scattering Measurement of Nanometer Particles in Liquids

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R. Pecora¹•Institutions (1)

Stanford University¹

01 Jun 2000-Journal of Nanoparticle Research

TL;DR: In this article, a review of DLS techniques for studying sizes and shapes of nanoparticles in liquids is presented. But the authors focus on the time fluctuations in the intensity of light scattered by the particle dispersion.

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Abstract: Dynamic light scattering (DLS) techniques for studying sizes and shapes of nanoparticles in liquids are reviewed. In photon correlation spectroscopy (PCS), the time fluctuations in the intensity of light scattered by the particle dispersion are monitored. For dilute dispersions of spherical nanoparticles, the decay rate of the time autocorrelation function of these intensity fluctuations is used to directly measure the particle translational diffusion coefficient, which is in turn related to the particle hydrodynamic radius. For a spherical particle, the hydrodynamic radius is essentially the same as the geometric particle radius (including any possible solvation layers). PCS is one of the most commonly used methods for measuring radii of submicron size particles in liquid dispersions. Depolarized Fabry-Perot interferometry (FPI) is a less common dynamic light scattering technique that is applicable to optically anisotropic nanoparticles. In FPI the frequency broadening of laser light scattered by the particles is analyzed. This broadening is proportional to the particle rotational diffusion coefficient, which is in turn related to the particle dimensions. The translational diffusion coefficient measured by PCS and the rotational diffusion coefficient measured by depolarized FPI may be combined to obtain the dimensions of non-spherical particles. DLS studies of liquid dispersions of nanometer-sized oligonucleotides in a water-based buffer are used as examples.

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549 citations

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Laser Light Scattering

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