نتایج جستجو برای: storage modulus

تعداد نتایج: 208883  

1998
Jan Wilhelm Erwin Frey

We calculate the storage modulus of a solution of semiiexible polymers in the plateau regime using a tube model that takes the eeect of nite polymer length into account. For experimentally relevant parameters the result shows the previously obtained scaling behavior. Our calculation allows a prediction for the absolute value of the modulus which is found to be in good agreement with recent rheo...

The rheological properties of four different Kuwaiti crude oils in the presence of polyacrylamide (PAA) were investigated. PAA was varied at three different concentrations of 25, 50, and 75 ppm to study the viscoelastic properties in the untreated samples. Four different temperatures (25, 30, 35, and 40 °C) were used to evaluate different viscoelastic parameters of the treated and untreated Kuw...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2008
Sivaraj Sivaramakrishnan James V DeGiulio Laszlo Lorand Robert D Goldman Karen M Ridge

Keratin intermediate filaments (KIFs) form cytoskeletal KIF networks that are essential for the structural integrity of epithelial cells. However, the mechanical properties of the in situ network have not been defined. Particle-tracking microrheology (PTM) was used to obtain the micromechanical properties of the KIF network in alveolar epithelial cells (AECs), independent of other cytoskeletal ...

Journal: :Carbohydrate polymers 2013
P Fitzpatrick J Meadows I Ratcliffe Peter A Williams

The interaction of native xanthan gum, deacetylated xanthan gum and depyruvated xanthan gum with konjac glucomannan has been studied using DSC and controlled stress rheometry. In the absence of electrolyte the DSC cooling curves for native xanthan and deacetylated xanthan showed a single peak and there was a corresponding sharp increase in the storage modulus indicating gel formation. It is app...

Journal: :Computer Methods in Biomechanics and Biomedical Engineering 2013

2012
Zhijia Liu Zehui Jiang Zhiyong Cai Benhua Fei Yan Yu Xing’e Liu

Bamboo is a type of biomass materials that has great potential as a bioenergy resource in China. The thermal-mechanical behavior of bamboo plays an important role in the formation process of pellets. To investigate the effect of moisture content (MC) on thermal-mechanical behavior of bamboo, the storage modulus and loss factor of moso bamboo was determined using dynamic mechanical thermal analy...

Journal: :Dental materials : official publication of the Academy of Dental Materials 2003
Y Papadogiannis D B Boyer M Helvatjoglu-Antoniades R S Lakes C Kapetanios

OBJECTIVE The purpose of the study was to measure the viscoelastic properties of four dental resin composite cements using a dynamic mechanical analysis technique. METHODS Dynamic torsional loading was conducted in the frequency range from 1 to 80 Hz. Cement specimens were tested after storage in 37 degrees C water for 24 h. One group was thermal cycled prior to testing. Measurements were tak...

Journal: :The Journal of experimental biology 2013
M Braun M Menges F Opoku A M Smith

Metal ions are present in many different biological materials, and are capable of forming strong cross-links in aqueous environments. The relative contribution of different metal-based cross-links was measured in the defensive glue produced by the terrestrial slug Arion subfuscus. This glue contains calcium, magnesium, zinc, manganese, iron and copper. These metals are essential to the integrit...

Journal: :Organic & biomolecular chemistry 2015
Mohammad Aref Khalily Melis Goktas Mustafa O Guler

A dynamic covalent crosslinking approach is used to crosslink supramolecular peptide gels. This novel approach facilitates tuning viscoelastic properties of the gel and enhances mechanical stability (storage modulus exceeding 10(5) Pa) of the peptide gels.

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