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Lu's Corner: Let's Talk About Viscosity

*Lu's Corner is a new concept hosted by our Technical Specialist, Lu Lu. Lu has been a Technical Specialist with RheoSense for over 2 years. Through meticulous customer relationship development and continuous exploration of new applications, Lu has been able to provide a level of outstanding customer service and support.

 What do we talk about when we talk about viscosity? A series stories of viscosity in life.

Story One - Cosmos and Cosmetics

In Applications, Fun with Viscosity, General Information, RheoSense, Inc., Viscosity Measurements, viscosity, Injectability, Application Focus

Vape Pens & "High" Viscosity

As marijuana use becomes more mainstream, the use of vaporizer pens or vape pens as a delivery system for THC is steadily increasing in popularity. Vape pens are not your classic bongs as seen in some old school Cheech and Chong movies, but are in fact a high-tech device; a high-tech device where precision and accuracy are critical to performance.

In Fun with Viscosity, Applications, viscosity, Viscometer, Viscosity Measurements

Intrinsic Viscosity Measurements of Protein Solutions

The requirement to measure intrinsic viscosity and the demand for such measurements have been increasing. This is a result of increasing industry demand to produce optimized formulations and reduce the production timeline as much as possible. In addition, many protein formulation scientists seeing the benefits in understanding the molecular structure and interactions of their candidate proteins in formulations.

In Viscosity Measurements, Intrinsic Viscosity

Not too little, not too much, just the right amount of force

Do you subconsciously dread the first drop of ketchup out of its bottle? Have you noticed the inconsistent flow in the substance as you try to coax the ketchup out, only to have a huge gush of flow when you realize you have coaxed it a little too well? 

In Proteins, m-VROC, Viscometer, Applications, VROC initium, Biotechnology, Inks Viscosity, Blood Viscosity, Viscosity Measurements

Viscosity vs. Concentration: L-Arginine Dilute Solutions in Water & PBS

 The exact mechanism by which Arginine molecules affect protein molecules in solution is unclear. Nonetheless, its benefits increasing solubility and controlling viscosity have spread out its application in biopharma formulations, specially for high concentration antibody solutions. 

In our application note, we examine the effect of concentration on the viscosity of dilute solutions of L-Arginine in water and PBS. Additionally, we study the Intrinsic Viscosity of this solutions to better understand molecular size and solubility in dilution. 

Download L-Arginine  Application Note

In Viscosity Measurements, Applications, Biotechnology, Rheometer, m-VROC, Proteins, Viscometer, RheoSense, Inc., Automatic Viscometer, VROC initium, High throughput Viscometer

Application Corner - Conductive Inks

Viscosity of conductive inks with m-VROC® and microVISC™:

Viscosity of conductive inks, paints and coatings is key to establish manufacturing processes for printed electronics and display systems. The complexity of printing and coating technologies has motivated a rapid growth of the conductive inks industry. To meet the market demands, efficient, highly accurate and fast characterization methods are required.
Conventional viscometers are often unable to fully characterize complex fluids (i.e. they are not able to measure viscosity as a function of shear rate or extensional properties). On the other hand, rheometers are limited to relatively low (<10,000 1/s) deformation rates. Our microfluidic-based VROC® (Viscometer/Rheometer On a Chip) technology overcomes these limitations.
RheoSense viscometers are able to fully characterize the flow curves (viscosity vs shear rate) of complex fluids for shear rates ranging from 0.5 to 1,400,000 1/s. Additionally, we offer measurements of extensional viscosity and temperature control from 4°C to 105°C. Accurate measurements of shear and extensional viscosity at the deformation rates and temperatures relevant for the fabrication processes are essential to understand the subtleties of the different printing and coating technologies.

VROC® powered instruments, provide a solution to the challenges of conventional technologies. The high accuracy and repeatability over a wide range of deformation rates make our systems Simply Precise™ at a fraction of the sample volume and testing time!
Target Keywords
Inks Viscosity
Non-Newtonian Inks
Shear Thinning Inks
Accurate Low Viscosity Measurements
Inkjet Inks
Ceramic Inks
Water Based Inks
Biopolymer and Protein Inkjet
In microVISC, Viscosity Measurements, VROC Technology, Rheometer, m-VROC, viscosity


That's right! You can 3D-print food. This presents a new and very interesting perspective in cooking with opportunities to modify the structure of the goods we eat. Icing, syrups, honey, nutella, dough... there are few limitations and some challenges to this process. 

In Viscosity Measurements, Fun with Viscosity

The Art of Viscosity

It is widely accepted that viscosity plays a crucial role in current printing and coating industries. In a very similar way, viscosity has a strong influence on the texture of artistic paintings. Textures may not be as obvious as colors in a painting, but it can be just as important in conveying the artist’s idea or concept behind it. 

In Viscosity Measurements, Applications

Units of Viscosity Part I

Units of Viscosity: Part I

The most commonly used unit for dynamic viscosity is centipoise (cP), which is equivalent to 0.01 Poises (P). This unit is used in honor of French physicist Jean Léonard Marie Poiseuille (1797-1869) who worked with Gotthilf Hagen on the widely known Hagen-Poiseuille’s law which applies to laminar flow through pipes. It is not a coincidence that the viscosity of distilled water at 20°C was used to define 1 cP. In order to give you an idea of the viscosity of some conventional fluids we have collected their viscosities in Table 1. The SI unit for viscosity is the Pascal-second (Pa-s), which corresponds to the force (N) per unit area (m2) divided by the rate of shear (s-1). However, since the viscosity of most fluids is below 1 Pa-s (See table 1), the cP equivalent or milipascal-second (mPa-s) is often used.

In Viscosity Measurements, General Information

Webinar: Fundamentals of Viscosity - Newtonian vs. non-Newtonian

Flow behavior of complex fluids is traditionally characterized through the distinction between Newtonian and non-Newtonian based on each fluid's viscosity dependence on both deformation and speed of deformation. Proper understanding of material properties is vital for more complex concepts such as shear stress, shear strain, and shear rate. Practical applications include production processes such as inkjet printingprotein formulations/injections, and food/beverage manufacturing. 

RheoSense’s webinar will explain the differences between Newtonian and non-Newtonian fluids and cover the fundamentals on establishing the viscosity fingerprint of materials using real application examples. 

In Viscosity Measurements, Conference/Event