The ViscoStar™ II viscometer offered by Wyatt Technology has low baseline drift and noise. With unprecedented signal-to-noise ratio, the online differential viscometer accepts external signals for zero, purge, and recycle. It features Ethernet and USB communications and full color LCD display that transmits data at a glance. User-selectable delay volumes and Transducer Protection System (TPS) are the other features of the ViscoStar™ II viscometer.
Professor Skip Rochefort’s group at Oregon State University together with Wyatt Technology measured the intrinsic viscosity and Mark-Houwink-Sakurada (MHS) behavior of Hyaluronic Acid (HA) using instruments, including an Optilab rEX, a DAWN EOS, and a ViscoStar. Using the strange MHS behavior, the difference in HA MHS coefficients reported in the literature was explained.
The following table summarizes the key specifications of the ViscoStar II:
|Differential Viscosity Data
||0.5% of full scale
||0.1 sec to infinity, increments of 0.1 sec
||5kPa (0.725 psi), protected against overpressure
||< 0.15 Pa (2.2•10-5 psi)
||< 2.5 Pa/hr (3.6•10-4 psi/hr)
|Sample shear rate
|Maximum flow rate
||1-3mL/min (solvent dependent)
|Delay volume options
||27, 12 or 4 mL
|Max. outlet pressure
||220kPa (31.9 psi)
|Max. system pressure
||690kPa (100 psi), protected against overpressure
||33 µL / bridge arm
|Bridge capillary i.d.