scholarly journals Connecting structure, dynamics and viscosity in sheared soft colloidal liquids: a medley of anisotropic fluctuations

Soft Matter ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 171-180 ◽  
Author(s):  
Fabian Westermeier ◽  
David Pennicard ◽  
Helmut Hirsemann ◽  
Ulrich H. Wagner ◽  
Christoph Rau ◽  
...  
Keyword(s):  
Viscoelastic Behavior ◽  
Colloidal Suspensions ◽  
X Ray ◽  
Structure Dynamics ◽  
Colloidal Liquids ◽  
Transient Structure

Simultaneous coherent X-ray and rheology experiments provide access to the transient structure, dynamics and viscoelastic behavior in repulsive colloidal suspensions.

scholarly journals Copper Containing Glass-Based Bone Adhesives for Orthopaedic Applications: Glass Characterization and Advanced Mechanical Evaluation

2020 ◽  
Author(s):  
Sahar. Mokhtari ◽  
Anthony.W. Wren
Keyword(s):  
Mechanical Properties ◽  
Photoelectron Spectroscopy ◽  
Structural Changes ◽  
Viscoelastic Behavior ◽  
Polymer Chains ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compression Data

AbstractThis study addresses issues with currently used bone adhesives, by producing novel glass based skeletal adhesives through modification of the base glass composition to include copper (Cu) and by characterizing each glass with respect to structural changes. Bioactive glasses have found applications in fields such as orthopedics and dentistry, where they have been utilized for the restoration of bone and teeth. The present work outlines the formation of flexible organic-inorganic polyacrylic acid (PAA) – glass hybrids, commercial forms are known as glass ionomer cements (GICs). Initial stages of this research will involve characterization of the Cu-glasses, significant to evaluate the properties of the resulting adhesives. Scanning electron microscopy (SEM) of annealed Cu glasses indicates the presence of partial crystallization in the glass. The structural analysis of the glass using Raman suggests the formation of CuO nanocrystals on the surface. X-ray diffraction (XRD) pattern and X-ray photoelectron spectroscopy (XPS) further confirmed the formation of crystalline CuO phases on the surface of the annealed Cu-glass. The setting reaction was studied using Fourier transform infrared spectroscopy (ATR-FTIR). The mechanical properties of the Cu containing adhesives exhibited gel viscoelastic behavior and enhanced mechanical properties when compared to the control composition. Compression data indicated the Cu glass adhesives were efficient at energy dissipation due to the reversible interactions between CuO nano particles and PAA polymer chains.

scholarly journals Optical and X-ray scattering studies of the electric field-induced orientational order in colloidal suspensions of pigment nanorods

2018 ◽  
Vol 267 ◽  
pp. 286-296 ◽  
Author(s):  
Oleksandr Buluy ◽  
Natalie Aryasova ◽  
Oleksandr Tereshchenko ◽  
Yuriy Kurioz ◽  
Vassili Nazarenko ◽  
...  
Keyword(s):  
Electric Field ◽  
Orientational Order ◽  
Colloidal Suspensions ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals Particle-scale structure in frozen colloidal suspensions from small-angle x-ray scattering

2011 ◽  
Vol 83 (2) ◽  
Author(s):  
Melissa Spannuth ◽  
S. G. J. Mochrie ◽  
S. S. L. Peppin ◽  
J. S. Wettlaufer
Keyword(s):  
Small Angle ◽  
Colloidal Suspensions ◽  
Scale Structure ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Structure-dynamics relationship in crystallizing poly(ethylene terephthalate) as revealed by time-resolved X-ray and dielectric methods

Polymer ◽  
2004 ◽  
Vol 45 (11) ◽  
pp. 3953-3959 ◽  
Author(s):  
C. Alvarez ◽  
I. Šics ◽  
A. Nogales ◽  
Z. Denchev ◽  
S.S. Funari ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
Time Resolved ◽  
X Ray ◽  
Structure Dynamics ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

X-ray diffraction study of the transient structure of sliding charge density waves in NbSe3

2002 ◽  
Vol 12 (9) ◽  
pp. 181-182
Author(s):  
H. Requardt ◽  
D. Rideau ◽  
R. Danneau ◽  
A. Ayari ◽  
F. Ya Nad ◽  
...  
Keyword(s):  
Charge Density ◽  
Density Wave ◽  
Charge Density Waves ◽  
X Ray Diffraction ◽  
X Ray ◽  
Slowing Down ◽  
Current Contact ◽  
Decay Profile ◽  
Stretched Exponential Decay ◽  
Transient Structure

We present high resolution X-ray diffraction measurements on NbSe3 of the charge-density-wave (CDW) relaxation from the deformation created by the sliding of the CDW. The data are taken in the temperature range 75 K < T < 105 K in the upper-CDW phase of NbSe, and cover spatial positions up to $8OO~\mu$m from the current contact. Convenient fits to the data are obtained by a stretched exponential decay profile yielding exponents μ in the range of 0.4–0.7 and relaxation time-scales τ of the order of 1–150 ms. becoming faster with increasing sample temperature and slowing down with increasing distance from the current contact.

Synthesis of Aerogel-Metal Cluster Composites by Gamma Radiolysis

2002 ◽  
Vol 740 ◽  
Author(s):  
Massimo F. Bertino ◽  
Jared F. Hund ◽  
Guohui Zhang ◽  
Chariklia Sotiriou-Leventis ◽  
Nicholas Leventis ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Metal Ion ◽  
Gamma Ray ◽  
Metal Clusters ◽  
Metal Cluster ◽  
Surface Oxidation ◽  
Colloidal Suspensions ◽  
X Ray ◽  
Au Clusters

ABSTRACTNoble metal clusters (Ag, Au) were formed in a silica aerogel matrix by gamma irradiation of hydrogel precursors loaded with aqueous solutions containing Ag+ or [AuCl4]- ions. Hydrogels exposed to gamma rays assumed the color expected for colloidal suspensions of Ag (respectively Au) clusters. The hydrogels were subsequently washed and supercritically dried, without any evident change in color, indicating that the metal clusters were not removed during drying. Typical gamma ray doses were between 3 and 3.5 kGy, and achieved complete reduction of hydrogels containing metal ion concentrations in the 10-4-10-3 M range. Metal clusters in the aerogel monoliths were characterized with optical absorption, transmission electron microscopy, X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy. These techniques have shown that the clusters have a crystalline fcc structure. Au clusters consist of pure Au, while surface oxidation of Ag clusters was observed with XPS.

scholarly journals A broadband laser plasma x-ray source for application in ultrafast chemical structure dynamics

2007 ◽  
Vol 78 (11) ◽  
pp. 115105 ◽  
Author(s):  
Wilfred Fullagar ◽  
Michael Harbst ◽  
Sophie Canton ◽  
Jens Uhlig ◽  
Monika Walczak ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Chemical Structure ◽  
X Ray ◽  
Structure Dynamics ◽  
Broadband Laser

scholarly journals Brownian and advective dynamics in microflow studied by coherent X-ray scattering experiments

2016 ◽  
Vol 23 (6) ◽  
pp. 1401-1408 ◽  
Author(s):  
Raphael Urbani ◽  
Fabian Westermeier ◽  
Benjamin Banusch ◽  
Michael Sprung ◽  
Thomas Pfohl
Keyword(s):  
Correlation Functions ◽  
Brownian Dynamics ◽  
Flow Behavior ◽  
Colloidal Suspensions ◽  
Single Scattering ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Advective Flow ◽  
X Ray ◽  
Auto Correlation

Combining microfluidics with coherent X-ray illumination offers the possibility to not only measure the structure but also the dynamics of flowing samples in a single-scattering experiment. Here, the power of this combination is demonstrated by studying the advective and Brownian dynamics of colloidal suspensions in microflow of different geometries. Using an experimental setup with a fast two-dimensional detector and performing X-ray correlation spectroscopy by calculating two-dimensional maps of the intensity auto-correlation functions, it was possible to evaluate the sample structure and furthermore to characterize the detailed flow behavior, including flow geometry, main flow directions, advective flow velocities and diffusive dynamics. By scanning a microfocused X-ray beam over a microfluidic device, the anisotropic auto-correlation functions of driven colloidal suspensions in straight, curved and constricted microchannels were mapped with the spatial resolution of the X-ray beam. This method has not only a huge potential for studying flow patterns in complex fluids but also to generally characterize anisotropic dynamics in materials.

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