A comprehensive review on MEMS-based viscometers

Miniature viscometer incorporating GaN optical devices with an ultrawide measurement range

“…Rotational viscometers based on measuring the torque required to rotate a spindle in the sample fluids can respond to a wide range of viscosities, but suffer from the drawbacks of being bulky, being expensive, and requiring large volumes of fluid. Various advanced approaches, such as droplet-based microfluidic approaches with microchannels [6][7][8][9] , suspended microchannel resonators [10][11][12] , vibrating cantilevers, and piezoelectric resonators [13][14][15][16] , have been proposed to boost the sensitivity to fluid viscosity at specific viscosity ranges. Therefore, the development of miniature, low-cost viscometers capable of wide-range, real-time measurement has remained challenging.…”

Microfluidic viscometer by acoustic streaming transducers

“…4,5 Traditional viscometers, such as cone and plate, falling ball, and capillary sensing, are generally used to measure fluid viscosities. 6,7 However, most of the conventional viscometers are extremely bulky, and require precise balance such as perfectly leveled flatbed to avoid error in the results. 8,9 These techniques typically require large sample volumes on the order of milliliters and timeconsuming data acquisition and sample handling steps.…”

Brushed Nano‐Stirbars for Measuring Viscosity in Microscopic Systems

“…At the scale of 100 µm, micro‐electro‐mechanical system (MEMS)‐based viscometers are being developed. [ 5 ] Such viscometers are integrated with microfluidics in a chip, thus requiring a much reduced volume of sample solutions. There are several detection schemes known, including oscillation, [ 6 ] acoustic, [ 7 ] cantilever, [ 8 ] and pressure‐based methods.…”