In-vitro evaluation of blood fluidity using an electromagnetically spinning rheometry system

The electromagnetically spinning (EMS) method for viscosity measurement was enhanced for applications in a confined reaction chamber. In the reaction chamber, the immersion of the rotor into the sample might trigger the precipitation and aggregation of ingredients to the pivot of the probe rotor, which leads to harmful frictional torque of the rotation. To address this problem, an upper-point-type auto-standing probe rotor was developed and applied for the long-term measurement of the solution process of rock sugar in water. In addition, we propose the adoption of a punched board, instead of a solid board, as the lower substrate of the plate-plate-type rotational viscometer, which allows rapid exchange of the sample fluid between the interior and exterior of the narrow measurement area through molecular diffusion. We investigated the effect of punches from the perspective of the diffusion process of momentum and determined the geometrical conditions

Section: Introductionmentioning

confidence: 99%

Application of EMS system for continuous measurement of rheology in reaction chamber

Hosoda¹,

Yamakawa²,

Sakai³

2023

“…A large amount of liquid, at least 1 ml, is also required by vibrational viscometers. [15][16][17][18] The electromagnetic spinning sphere (EMS) viscometer, [19][20][21][22][23][24][25] which can measure samples as small as 0.3 ml, is an example of a device that can measure small volumes. However, the EMS viscometer is difficult to use for measuring lowviscosity solutions due to its measurement principle.…”

Section: Introductionmentioning

confidence: 99%

Relative viscosity evaluation of low-volume samples using capillary flow under differential pressure

Sakamoto

Okazaki²,

Makino³

et al. 2022

In this study, we newly considered the analysis of capillary flow under differential pressure, which extends the previous study and allows the independent measurement of relative viscosity and the product of relative surface tension and contact angle for low-volume samples. The theory of this method is explained, and it is demonstrated that relative viscosity and surface tension with contact angle can be obtained independently by measuring the capillary flow under differential pressure. We conducted capillary flow experiments with a small sample volume (less than 100 μL) using a measurement system comprising a flow measurement unit, capillary chip, and differential pressure mechanism. The relative viscosities of pure water and dilute ethanol solutions obtained in the experiment were in one-to-one correspondence with the values in the Chemical Handbook. This also shows that relative surface tension can be determined using these measurement results and the separately measured contact angle values.

“…It is also effective for biohazardous materials including human organs and blood. [4][5][6][7][8][9][10][11] A recent trial for the construction of the quantum standard of viscosity is also described.…”

Section: Introductionmentioning

confidence: 99%

Introduction to rheometry for researchers of ultrasonics

Sakai

2021

Self Cite

In this paper, some recent topics on the methodology of viscoelasticity are introduced for researching ultrasonics. First, the role of viscoelasticity in ultrasonic relaxation phenomena is briefly summarized from the viewpoint of rheology. Then, the relaxation of two-dimensional viscoelasticity studied by surface light scattering experiments, which is analogous to the Brillouin scattering to detect thermal phonons, is discussed. Progress in the general method of rheometry using a rotational viscometer is also shown, in which the remote sensing of the viscosity by an electromagnetic spinning (EMS) method is described. Also examined is the possible accuracy of magneto levitated EMS, which can lead to the quantum standard of viscosity. Finally, ultrafast measurement of liquid properties, including surface tension and viscoelasticity, in which the technologies of micro liquid manipulation are employed, is introduced.