*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
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.
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.
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?
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.
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.
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.
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.
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 printing, protein 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.