An interferometric method is implemented in order to accurately assess the thermal fluctuations of a micro-cantilever sensor in liquid environments. The power spectrum density (PSD) of thermal fluctuations together with Sader's model of the cantilever allow for the indirect measurement of the liquid viscosity with good accuracy. The good quality of the deflection signal and the characteristic l...

In this article review of density and viscosity measurement methods is presented, including ultrasonic pulse echo methods, which are capable to measure these properties of polymer melts. The methods are presented according to measurement principles, methodology, accuracy and possibility to measure density and viscosity of polymer melts on-line during extrusion process. Such measurements are ver...

BACKGROUND Molecular rotors are fluorescent molecules that exhibit viscosity-dependent fluorescence quantum yield, potentially allowing direct measurements of cell membrane viscosity in cultured cells. Commercially available rotors, however, stain not only the cell membrane, but also bind to tubulin and migrate into the cytoplasm. We synthesized molecules related to 9-(dicyanovinyl)-julolidine ...

Viscosity is an intrinsic property of a fluid caused by friction between its own molecules layer while flowing. It would not only offer a decisive effect on the motion characteristics of the fluid, but also affects its application scopes. As a result, quickly and accurately understanding the physical feature of a fluid has always been an important target [1]. So far, the viscometers, the instru...

Tissue viscosity is correlated with tissue pathological changes and provides information for tissue characterization. In this study, we report an optical method to track continuous shear-wave propagation at centimeter depths in an optically turbid medium. Shear-wave attenuation coefficients were measured at multiple frequencies using shear-wave laser speckle contrast analysis (SW-LASCA) to quan...

The development of nanotechnology faces many problems, one of which is lack of a fast and cheap method for fabricating structures whose dimensions are less than 0.1 μm. One method to solve this problem is nanoimprint lithography (NIL). The method of fabricating nanometer scale patterns by NIL was first proposed by Chou1,2 in 1995. Nanoimprint lithography creates patterns by the mechanical defor...

A specklegram fiber sensor for the measurement of properties of liquids is proposed. The laser speckle field formed at the output of a multimode fiber is modulated by a vibrating microbending transducer. Once the transducer is placed in vessel filled by the sample, the frequency response of the specklegrams can be correlated to the properties of the liquid. The system was applied on the measure...

OBJECTIVES This study sought to determine the relationship between blood viscosity and iron deficiency and their impact on symptoms and exercise function in adults with cyanotic congenital heart disease. BACKGROUND Iron deficiency is believed to raise whole blood viscosity in cyanotic congenital heart disease, although available data are inconsistent. METHODS Thirty-nine cyanotic adults wer...