scholarly journals The Microcantilever: A Versatile Tool for Measuring the Rheological Properties of Complex Fluids

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
I. Dufour ◽  
A. Maali ◽  
Y. Amarouchene ◽  
C. Ayela ◽  
B. Caillard ◽  
...  
Keyword(s):  
Shear Stress ◽  
Rheological Properties ◽  
Hydrodynamic Force ◽  
Complex Fluids ◽  
Dynamic Spectrum ◽  
Complex Shear Modulus ◽  
Confined Fluid ◽  
Complex Shear ◽  
Versatile Tool ◽  
Surrounding Fluid

Silicon microcantilevers can be used to measure the rheological properties of complex fluids. In this paper, two different methods will be presented. In the first method, the microcantilever is used to measure the hydrodynamic force exerted by a confined fluid on a sphere that is attached to the microcantilever. In the second method, the measurement of the microcantilever's dynamic spectrum is used to extract the hydrodynamic force exerted by the surrounding fluid on the microcantilever. The originality of the proposed methods lies in the fact that not only may the viscosity of the fluid be measured, but also the fluid's viscoelasticity, that is, both viscous and elastic properties, which are key parameters in the case of complex fluids. In both methods, the use of analytical equations permits the fluid's complex shear modulus to be extracted and expressed as a function of shear stress and/or frequency.

Rheological Properties of High Grade Asphalt and its Mixture

2014 ◽  
Vol 599 ◽  
pp. 244-247 ◽  
Author(s):  
Qun Shan Ye ◽  
Chang Jian Ye ◽  
Zhi Lin Sun
Keyword(s):  
Rheological Properties ◽  
Dynamic Modulus ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Asphalt Binders ◽  
Test Results ◽  
Complex Shear Modulus ◽  
Complex Shear ◽  
Dynamic Modulus Test

Viscosity test, dynamic shear test, dynamic modulus test and creep test were conducted to investigate the rheological properties of high modulus asphalt and its mixture. Test results indicated that the viscosity of hard grade asphalt could be increased when compared with the ordinary asphalt, especially at high temperatures. The complex shear modulus and dynamic modulus of hard-grade asphalt binder and its mixture were increased, which implied that the stiffness of them was enhanced. Furthermore, the elastically portions for viscoelastic property of asphalt binders were increased, which resulted in the reduction of phase angle for hard grade asphalt binders and mixtures. The rutting parameter for hard-grade asphalt mixture was increased remarkably, which revealed that the resistance to permanent deformation could be significantly improved for hard grade asphalt mixture.

scholarly journals Analysis of the Dispersion of Viscoelastic Clusters in the Industrial Rotor-Stator Equipment

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2232
Author(s):  
Alexander Kolomiets ◽  
Tomas Jirout
Keyword(s):  
Shear Stress ◽  
Cfd Simulation ◽  
Good Choice ◽  
Complex Shear Modulus ◽  
Special Equipment ◽  
Complex Shear ◽  
Complex Rheology ◽  
Process Line ◽  
Specific Material ◽  
The Stability

Materials with complex rheology and viscoelasticity may require special equipment for processing, such as for dispergation. Rheological and mechanical data of the material can help with finding the required equipment or designing equipment. For highly viscous and complex material, a rotor-stator mixer can be a good choice for dispergation. Due to the laminar or creeping mechanism of flow inside the equipment, the dispergation mechanism is assumed to be a combination of the shear stress and slicing of the material by the rotor and stator blades. For the validation of the theory, the mechanical properties of the viscose identified in a previous work were used for comparison with the data from the CFD simulation of the rotor-stator mixer. The comparison showed that the rotor-stator device can overcome the complex shear modulus and ultimate strength of the material and homogenize the solution through a combination of the shear stress and slicing. The theory was also confirmed on the process line proposed for homogenization of the specific material. The stability of viscosity during the process of homogenization was measured and used as the main parameter for quality assessment.

EFFECT OF STYRENE-BUTADIENE ON RHEOLOGICAL PROPERTIES OF ASPHALT EMULSION

2015 ◽  
Vol 77 (23) ◽  
Author(s):  
M. Naqiuddin M. Warid ◽  
Mohd Rosli Hainin ◽  
Haryati Yaacob ◽  
Md. Maniruzzaman A. Aziz ◽  
Mohd Khairul Idham ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Complex Modulus ◽  
Viscosity Reduction ◽  
Curing Time ◽  
Complex Shear Modulus ◽  
Asphalt Emulsion ◽  
Modified Asphalt ◽  
Complex Shear ◽  
Styrene Butadiene ◽  
Rheometer Test

One of the main issues with cold mix asphalt (CMA) mixtures is having poor abrasion resistance with low cohesion, longer curing time and low elasticity. SBR is used to improve the rheological properties of the asphalt emulsion. This paper evaluates the effect of using different percentages of SBR in unaged slow-setting emulsion (SS-1K) in CMA. These modified emulsions were blended at various percentages, i.e. 2%, 4%, 6%, 8% and 10% of the weight of asphalt emulsion. The investigation focused on the rheological aspect which correlates the properties of unaged modified asphalt emulsion with its performance. Dynamic Shear Rheometer test (DSR) was used to measure the parameters of complex shear modulus, G* and phase angle, δ of the asphalt samples. Based on the results, it shows that by adding SBR in the asphalt emulsion improve the rutting resistance. From the isochronal curve, the complex modulus, G* of the modified emulsions was found higher than the unmodified emulsion. The modified emulsions show signs of improvement in binder properties in terms of elastic deformation and viscosity reduction. Therefore, it can be concluded that the SBR could improve the performance of the asphalt emulsion used in CMA.

RHEOLOGICAL PROPERTIES OF STYRENE BUTADIENE RUBBER MODIFIED BITUMEN BINDER

2016 ◽  
Vol 78 (7-2) ◽  
Author(s):  
Haryati Yaacob ◽  
Moazzam Ali Mughal ◽  
Ramadhansyah Putra Jaya ◽  
Mohd Rosli Hainin ◽  
Dewi Sri Jayanti ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Rheological Properties ◽  
Great Influence ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Complex Shear Modulus ◽  
Modified Bitumen ◽  
Rotational Viscometer ◽  
Complex Shear ◽  
Styrene Butadiene

The study investigates the rheological properties of bitumen of 60-70 penetration grade modified with Styrene Butadiene Rubber (SBR). SBR is an elastomer which is an important sort of synthetic rubber. It is a copolymer whose molecular structure primarily consists of organic compound styrene and butadiene chain. Bitumen is visco-elastic in nature. The rate of load application and temperature has a great influence on its performance. Various fundamental properties of bitumen were evaluated, namely complex shear modulus (G*), short-term ageing, long-term ageing, viscosity, penetration and softening point by using Dynamic Shear Rheometer (DSR), Rolling Thin Film Oven Test (RTFOT), Pressure Aging Vessel (PAV), Rotational Viscometer (RV), Penetrometer and Ring and Ball Test, respectively. The binders were mixed with varying percentage of SBR i.e. 0, 1, 2, 3, 4, and 5% by the weight of bitumen binder. The use of SBR has played an active role in improving the viscoelastic properties of bitumen. The use of SBR modifier changes the rheological behavior of bitumen by increasing its complex shear modulus (G*) and the resistance of mixture against permanent deformation (rutting). It was also found that increasing the content of SBR led to the increase in viscosity of modified bitumen, which helps in elevating the mixing and compaction temperature of asphalt mixtures.

Evaluating the Properties of Bitumen Stabilized with Carbon Nanotubes

2013 ◽  
Vol 723 ◽  
pp. 312-319 ◽  
Author(s):  
Wynand JvdM Steyn ◽  
Tanya E. Bosman ◽  
Samantha Galle ◽  
Jacques van Heerden
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Shear Modulus ◽  
Rheological Properties ◽  
Complex Modulus ◽  
Fatigue Cracking ◽  
Complex Shear Modulus ◽  
Multi Walled Carbon Nanotube ◽  
Complex Shear ◽  
Plastic Sample

The aim of this paper is to investigate the rheological properties of Multi-Walled Carbon NanoTube (MWCNT) enhanced bitumen. The rheological properties of bitumen samples with a range of MWCNT applications are evaluated. The shear complex modulus of the samples increased after ageing, and also increased as the percentage of MWCNTs increased. The viscous component of the complex shear modulus was found to be dominant at higher temperatures, but as the concentration of MWCNTs increased, it was found that the elastic portion started to dominate at higher temperatures. At higher temperatures a change in the phase angle was found, with increased concentrations of MWCNTs causing a decrease in δ, representing a more plastic sample. It is shown that addition of MWCNTs as a modifier did not increase the cracking resistance of the bitumen. Thus, if fatigue cracking is of concern in a certain area it is not recommended to use MWCNTs as a modifier. As the quantity of MWCNTs increased, the temperature at which rutting would start to occur, increased.

scholarly journals Size effects on rotational particle diffusion in complex fluids as probed by Magnetic Particle Nanorheology

2019 ◽  
Vol 21 (48) ◽  
pp. 26525-26539 ◽  
Author(s):  
Melissa Hess ◽  
Eric Roeben ◽  
Patricia Rochels ◽  
Markus Zylla ◽  
Samira Webers ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Size Effects ◽  
Magnetic Particle ◽  
Complex Fluids ◽  
Particle Diffusion ◽  
Size Dependent ◽  
Tracer Particles ◽  
Versatile Tool ◽  
Magnetic Tracer

Magnetic Particle Nanorheology is a versatile tool to investigate the size-dependent rheological properties of complex fluids using magnetic tracer particles.

Dynamic and shear stress rheological properties of guar galactomannans and its hydrolyzed derivatives

2015 ◽  
Vol 72 ◽  
pp. 687-691 ◽  
Author(s):  
Majid Hussain ◽  
Serafim Bakalis ◽  
Ourania Gouseti ◽  
Tahir Zahoor ◽  
Faqir Muhammad Anjum ◽  
...  
Keyword(s):  
Shear Stress ◽  
Rheological Properties

scholarly journals Impact of chosen force fields and applied load on thin film lubrication

Friction ◽  
2021 ◽  
Author(s):  
Thi D. Ta ◽  
Hien D. Ta ◽  
Kiet A. Tieu ◽  
Bach H. Tran
Keyword(s):  
Thin Film ◽  
Shear Stress ◽  
Surface Structure ◽  
Rheological Properties ◽  
Surface Potential ◽  
Applied Load ◽  
Velocity Slip ◽  
Thin Film Lubrication ◽  
Lubrication Performance ◽  
Film Lubrication

AbstractThe rapid development of molecular dynamics (MD) simulations, as well as classical and reactive atomic potentials, has enabled tribologists to gain new insights into lubrication performance at the fundamental level. However, the impact of adopted potentials on the rheological properties and tribological performance of hydrocarbons has not been researched adequately. This extensive study analyzed the effects of surface structure, applied load, and force field (FF) on the thin film lubrication of hexadecane. The lubricant film became more solid-like as the applied load increased. In particular, with increasing applied load, there was an increase in the velocity slip, shear viscosity, and friction. The degree of ordering structure also changed with the applied load but rather insignificantly. It was also significantly dependent on the surface structure. The chosen FFs significantly influenced the lubrication performance, rheological properties, and molecular structure. The adaptive intermolecular reactive empirical bond order (AIREBO) potential resulted in more significant liquid-like behaviors, and the smallest velocity slip, degree of ordering structure, and shear stress were compared using the optimized potential for liquid simulations of united atoms (OPLS-UAs), condensed-phase optimized molecular potential for atomic simulation studies (COMPASS), and ReaxFF. Generally, classical potentials, such as OPLS-UA and COMPASS, exhibit more solid-like behavior than reactive potentials do. Furthermore, owing to the solid-like behavior, the lubricant temperatures obtained from OPLS-UA and COMPASS were much lower than those obtained from AIREBO and ReaxFF. The increase in shear stress, as well as the decrease in velocity slip with an increase in the surface potential parameter ζ, remained conserved for all chosen FFs, thus indicating that the proposed surface potential parameter ζ for the COMPASS FF can be verified for a wide range of atomic models.

Using μ2rheology to quantify rheological properties during repeated reversible phase transitions of soft matter

Lab on a Chip ◽  
2017 ◽  
Vol 17 (12) ◽  
pp. 2085-2094 ◽  
Author(s):  
Matthew D. Wehrman ◽  
Melissa J. Milstrey ◽  
Seth Lindberg ◽  
Kelly M. Schultz
Keyword(s):  
Phase Transitions ◽  
Rheological Properties ◽  
Soft Matter ◽  
Single Sample ◽  
Fluid Exchange ◽  
Reversible Phase ◽  
Surrounding Fluid

A novel microfluidic design enables repeated phase transitions in a single sample by surrounding fluid exchange and microrheological characterization.

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