Determination Of Dynamic Viscosity Research Articles

Determination of dynamic viscosity and stability for single and hybrid nanofluids of SiO2, TiO2, MWCNT and ZnO nanoparticles

Determination of dynamic viscosity and stability for single and hybrid nanofluids of SiO2, TiO2, MWCNT and ZnO nanoparticles

Determination of Dynamic Viscosity in Samples of Blood Plasma and Hemoglobin Solution Using Nuclear Magnetic Resonance

The viscosity evaluation in Plasma is extremely useful in the clinical evaluation of different diseases. A procedure is presented, based on Protonic Magnetic Resonance, for the evaluation of the dynamic viscosity in Blood Plasma and in hemoglobin solution from the determination of the transverse relaxation time (T2). To experimentally determine the T2 value, the impulse series Carr-Purcell-Meiboon-Gill was used in a MARAN DRX console (OXFORD INSTRUMENTS) and a homogeneous magnetic system (B0 = 0.095T). Values were obtained for the viscosity of the blood plasma and hemoglobin of 1.68 ± 0.12 mPas and 12.78 ± 3.55 mPas respectively, which agreed with the determined, in the same samples, using an Ostwald viscometer (1, 45 ± 0.06 mPas for the plasma and 12.82 ± 3.35 mPas for the dissolution of hemoglobin). The dynamic viscosity of the blood plasma was determined in 236 patients with Multiple Myeloma (2.19 ± 0.58 mPas), 142 with Drepanocytic Anemia (2.20 ± 0.79 mPas) showing statistically significant increases with respect to the characteristic values of the controls (1.68 ± 0.12mPas). Magnetic Relaxation is an option to evaluate plasma viscosity because it minimizes the volume of sample needed and eliminates the need to wash the viscometer between determinations. Magnetic Relaxation can compensate its relative high cost, compared with other Viscosimetry methods, facilitating other determinations of utility in several diseases.

Application of Fly Ash Derived Zeolites in Warm-Mix Asphalt Technology.

In recent years, numerous studies have been carried out on new technologies allowing to reduce of mix asphalt production temperatures. One of the possibilities is to foam the asphalt with “water-containing” additives, which include zeolites. So far, mainly synthetic zeolites of the Linde A structure type, obtained from chemical reagents, and natural clinoptilolite have been used in WMA technology. In this studies, the synthetic zeolites produced from fly ashes with 4 different types of crystalline structure were analyzed. Zeolite materials were characterized by textural parameters and thermal analysis. The amount of zeolite added to asphalt was 0, 3, 5, 7 wt % in relation to the weight of asphalt. Determination of dynamic viscosity was performed at two temperatures: 135 and 160 and 4 time intervals. The tests were performed for two asphalt binders: 35/50 and 100/150 penetration grade. As a conclusion, it was found that the viscosity of asphalt pastes with zeolitic materials increases with the increase in the amount of zeolite added. The increase level depends mainly on the textural parameters. The potential usefulness of fly ash derived zeolites in the process of asphalt foaming, which depends mainly on the amount of water contained in the zeolite structure and the method of its release, has been proved.

Methodology of determining the dynamic viscosity of polyacrylic resin Ⅱ

Objective: To study the rheological behavior of polyacrylic resin Ⅱand establish a method to determine its dynamic viscosity.Methods: The Malvern Bohlin Gemini HRnano concentric cylinder rheometer was used to determine the dynamic viscosity of polyacrylic resin Ⅱ at 20 ℃ with a shear rate of 10 s-1.Results: Polyacrylic resin Ⅱ is a kind of newtonian fluid.The dynamic viscosity of three batches of samples were 70.9,71.8 and 71.1 mPa/s,respectively,and RSD were 0.3%,0.3% and 0.5%,respectively(n=28).Conclusion: The method is convenient,accurate and reproducible and is suitable for the determination of dynamic viscosity of polyacrylic resin Ⅱ.

Determination of dynamic viscosity of boiler fuels and heavy engine fuels

Determination of dynamic viscosity of boiler fuels and heavy engine fuels