Rheological properties of methylcellulose aqueous gels under dynamic compression: Frequency sweep and validity of scaling law

2010 ◽  
Vol 117 (4) ◽  
pp. 2436-2443 ◽  
Author(s):  
Madhumita Kundu ◽  
S. Mallapragada ◽  
R. C. Larock ◽  
P. P. Kundu
Keyword(s):  
Rheological Properties ◽  
Dynamic Compression ◽  
Scaling Law ◽  
Frequency Sweep ◽  
Aqueous Gels

scholarly journals Relationship between Structure and Rheology of Hydrogels for Various Applications

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 255
Author(s):  
Gorjan Stojkov ◽  
Zafarjon Niyazov ◽  
Francesco Picchioni ◽  
Ranjita K. Bose
Keyword(s):  
Rheological Properties ◽  
Rheological Behavior ◽  
Chemical Structure ◽  
Industrial Applications ◽  
Rheological Characteristics ◽  
Frequency Sweep ◽  
The Relationship

Hydrogels have gained a lot of attention with their widespread use in different industrial applications. The versatility in the synthesis and the nature of the precursor reactants allow for a varying range of hydrogels with different mechanical and rheological properties. Understanding of the rheological behavior and the relationship between the chemical structure and the resulting properties is crucial, and is the focus of this review. Specifically, we include detailed discussion on the correlation between the rheological characteristics of hydrogels and their possible applications. Different rheological tests such as time, temperature and frequency sweep, among others, are described and the results of those tests are reported. The most prevalent applications of hydrogels are also discussed.

Study of the rheological properties and solution microstructure of progressively cross‐linked aqueous gels

2021 ◽  
pp. 50964
Author(s):  
Xin Lv ◽  
Shoucheng Liang ◽  
Fujie Sun ◽  
Jian Zhang ◽  
Qiang Li ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Aqueous Gels

Preparation and Properties of Nanoclay/TPS/Asphalt Ternary Binders

2009 ◽  
Vol 620-622 ◽  
pp. 497-500 ◽  
Author(s):  
Shao Peng Wu ◽  
Jin Gang Wang ◽  
Yuan Zhang
Keyword(s):  
Rheological Properties ◽  
High Speed ◽  
Complex Modulus ◽  
Preliminary Investigation ◽  
Asphalt Binder ◽  
Asphalt Binders ◽  
Frequency Sweep ◽  
Modified Asphalt ◽  
Aging Resistance ◽  
Before And After

After a preliminary investigation on the binary asphalt/clay binder, the ternary binder was prepared by adding the nanoclay and TAFPACK-SUPER (TPS) to the original asphalt. The previous research shows that exfoliated/intercalated layers homogeneously are dispersed in the asphalt matrix and the nanocomposite has formed. Rotation Thin Film Oven Test (RTFOT) and Pressure Age Vessel Test (PAV) results indicate that the modified asphalt with 3% organic nano-montmorillonite (OMMT) present better performance of aging resistance. The purpose of this research is to attain ternary asphalt binder with better rheological performance and aging resistance. The ternary modified asphalt binder containing 4% OMMT and 12% TPS by weight were prepared at the laboratory scale using high speed shearing mixer. The rheological properties of OMMT/TPS modified asphalt binders were evaluated before and after aging in present paper. Temperature sweep tests and frequency sweep tests were conducted to characterize the rheological properties of modified asphalt using Dynamic Shear Rheometer (DSR). According to the frequency sweep tests, complex modulus master curves were plotted to analysis the rheological properties. The results indicate that nanoclay/TPS/asphalt ternary binders have more excellent performance of rheological and aging resistance at both high and low temperatures, compared with the virginal bitumen and TPS modified asphalt.

Research on Rheological Properties of Warm Mix Asphalt Binders

2013 ◽  
Vol 689 ◽  
pp. 363-367
Author(s):  
You Quan Zou
Keyword(s):  
Rheological Properties ◽  
Energy Savings ◽  
Mechanical Analysis ◽  
Warm Mix Asphalt ◽  
Environmental Benefits ◽  
Asphalt Binders ◽  
Frequency Sweep ◽  
Conventional Tests ◽  
Rheological Test ◽  
Dynamic Shearing

Abstract. Warm mix asphalt (WMA) has been gaining increasing popularity in recent years due to energy savings and environmental benefits. Warm mix asphalt reduces the production temperatures (mixing and compaction) while maintains the advantages of hot mix asphalt (HMA). It is becoming an attractive paving material. Therefore, it is important to understand the rheological behavior of asphalt binders changes with temperature and proportion of the additives. In this study, rheological properties of one commonly used binder PG 70-28 were evaluated, with and without additives (Sasobit® and Aspha-Min®) as the warm asphalt additives, by means of conventional tests as well as dynamic mechanical analysis using Dynamic Shearing Rheometer (DSR).The rheological test included viscosity, temperature sweep and frequency sweep.

Effects of Defatted Flaxseed Addition on Rheological Properties of Wheat Flour Slurry

2013 ◽  
Vol 9 (4) ◽  
pp. 457-466 ◽  
Author(s):  
Changchun Hao ◽  
Dong Li ◽  
Zhihuai Mao ◽  
Necati Ozkan ◽  
Xiao Dong Chen
Keyword(s):  
Rheological Property ◽  
Rheological Properties ◽  
Wheat Flour ◽  
Sucrose Concentration ◽  
Water Concentration ◽  
Experimental Measurements ◽  
Frequency Sweep ◽  
Slurry Concentration ◽  
Nacl Concentration ◽  
Flour Slurry

AbstractRheological property of defatted flaxseed-added wheat flour dispersions was investigated as a function of defatted flaxseed concentration (0–20%), NaCl concentration (0, 0.6, and 1.2%), sucrose concentration (0, 5, and 10%), and slurry concentration (33and 62.5%). Frequency sweep tests at 20°C and temperature sweep tests from 20 to 90°C were applied to the samples. The experimental measurements demonstrated that the viscoelastic moduli of samples increased with the increase in defatted flaxseed concentration from 0 to 20% and decreased with the increase in NaCl, sucrose, and water concentration at 20°C. The gelatinization temperatures of the defatted flaxseed-wheat slurry samples were delayed with the addition of defatted flaxseed, NaCl, and sucrose but hastened with the addition of water.

scholarly journals Physicochemical, pasting, and rheological properties of pearl millet starches from different cultivars and their relations

2020 ◽  
Vol 49 (1) ◽  
pp. 49-59 ◽  
Author(s):  
A.K. Siroha ◽  
S. Punía ◽  
K.S. Sandhu ◽  
B.L. Karwasra
Keyword(s):  
Rheological Properties ◽  
Yield Stress ◽  
Pearl Millet ◽  
Starch Granule ◽  
Amylose Content ◽  
Granule Size ◽  
Elastic Behaviour ◽  
Frequency Sweep ◽  
Flow Behaviour Index ◽  
Behaviour Index

Physicochemical, pasting, and rheological properties of pearl millet starches were studied and correlations among these properties were calculated. Amylose content, swelling power, and solubility of starches varied from 11.57 to 21.93%, 11.11 to 17.91 g g−1 and 12.20 to 15.20%, respectively. Volume% of starch granule size less than 10 µm varied from 36.23 to 48.34%, and 12.16 to 18.75% for above 20 µm size of granule. Peak viscosity of starches varied from 1291 to 1853 mPa·s, cv. RHB-173 had the highest value. Frequency sweep measurement of starch pastes revealed higher magnitude of G′ as compared to G″ with increase in to, indicating visco-elastic behaviour. Yield stress (σo), consistency index (K), and flow behaviour index (n) were observed as 40.73 to 115.72 Pa, 0.729 to 3.998 Pa·s, and 0.604 to 0.964, respectively. Starch pastes from cultivars studied showed shear thinning behaviour.

scholarly journals Rheological analysis of mud from Port of Hamburg, Germany

2019 ◽  
Vol 20 (6) ◽  
pp. 2553-2562 ◽  
Author(s):  
Ahmad Shakeel ◽  
Alex Kirichek ◽  
Claire Chassagne
Keyword(s):  
Rheological Properties ◽  
Yield Stress ◽  
Measurement Techniques ◽  
Organic Matter Content ◽  
Matter Content ◽  
Rheological Parameters ◽  
Fluid Mud ◽  
Frequency Sweep ◽  
Rheological Analysis ◽  
Stress Dependent

Abstract Purpose An innovative way to define navigable fluid mud layers is to make use of their rheological properties, in particular their yield stress. In order to help the development of in situ measurement techniques, it is essential that the key rheological parameters are estimated beforehand. Is there only one yield stress? In which shear rate/shear stress range is yield expected to occur? How is yield stress dependent on depths and locations in the harbor? In order to answer these questions, we investigated the changes in the rheological properties of mud from along the river stream in the Port of Hamburg, Germany, using a recently developed laboratory protocol. Materials and methods In this study, a detailed rheological analysis was carried out on the mud samples collected from different locations and depths of the Port of Hamburg. A variety of rheological tests was performed including: stress sweep tests, flow curves, thixotropic tests, oscillatory amplitude, and frequency sweep tests. Results and discussion The yield stresses of sediments from different locations were significantly dissimilar from each other due to differences in densities and organic matter content. Two yield stresses (termed static and fluidic) were observed for every sample and linearly correlated to each other. The thixotropic studies showed that all mud samples, except from one location, displayed a combination of thixotropic and anti-thixotropic behaviors. The results of frequency sweep tests showed the solid-like character of the sediments within the linear viscoelastic limit. The yield stresses, thixotropy, and moduli of the mud samples increased by going deeper into the sediment bed due to the increase in density of the sediments. Conclusions This study confirmed the applicability of the recently developed protocol as a fast and reliable tool to measure the yield stresses of sediments from different locations and depths in the Port of Hamburg. The fluid mud layer, in all the locations it was observed, exhibited relatively small yield stress values and weak thixotropic behavior. This confirms that despite the fact that rheology of fluid mud is complex, this layer can be navigable.

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