When tempted to think I know all there is about surface tension measurement, further information brings me back to earth. I’m conversant with the principal applications: surfactant analysis, plating, detecting contaminants, development of ink and the like. I have assisted customers to set up and calibrate duNouy Ring tensiometers for most applications -- all the while taking for granted that the Ring technique was the method of choice -- with only infrequent questions arising about Wilhelmy Plate tensiometers.
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Topics:
Wilhelmy Plates,
duNouy Rings,
Tensiometer,
Surface Tension,
interfacial surface tension,
Liquid Properties,
surface tension instruments,
surface tension analysis,
Digital tensiometer,
automatic Tensiometer
We’ve all heard of Density since general science class in middle school. "The weight of a 12 ounce Coke." That’s pretty simple.
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Topics:
Liquid Properties,
density,
oscillating u-tube,
liquid density
The first question is, "What are Liquid Properties?" Are they some kind of underwater real estate?
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Topics:
Automatic Surface Tension Measurment,
Measure Viscosity,
Consistency,
contact angle,
Liquid Properties,
density
Looking at the rotational viscometers on the market today, you'd expect to see small price differences between the instruments offered by competing brands. But what if you find one viscometer priced at $2000 and another at $9000? Is the $9000 viscometer a better instrument? Why is there such a price difference between the two instruments?
Viscometer prices depend on both the make-up of the instrument's motor, and on the technical features of the instrument (temperature probe, speed range, USB compatibility, etc.). There are two main types of rotational viscometers: those using a spring motor, and those using a servo motor.
In this article, I’m going to take a look the options available for rotational viscometers, and how those options affect the price.
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Topics:
Viscometers,
Viscosity,
Dynamic Viscosity,
rotational viscometer,
Liquid Properties
Most rotational viscometer specifications promise high test accuracy and repeatability. However, an instrument on its own cannot guarantee accurate results. Instrument set-up and using the right test parameters are critical pieces of the puzzle.
Test parameters and turbulence are two key factors to consider when preparing to test with a rotational viscometer. The spindle, speed setting, and temperature of the product are some of the parameters that can impact test results. Additionally, turbulence in the sample’s flow during a test will distort viscosity readings. Knowing how to manage these two factors can significantly contribute to the accuracy of your testing.
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Topics:
Measure Viscosity,
Viscometers,
Viscosity,
Dynamic Viscosity,
rotational viscometer,
Liquid Properties
You probably know that rotational viscometers work by measuring the torque on a vertical shaft that rotates a spindle. The spindle is in the test sample and its rotation is impeded in proportion to the viscosity of the sample. These instruments measure viscosity.
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Topics:
Viscometers,
Viscosity,
Liquid Properties
An understandable definition of surface tension: “The attraction force between molecules at the surface of a liquid. The force that keeps if from flying off into space”.
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Topics:
Tensiometer,
Surface Tension Measurement,
Surface Tension,
actual surface tension,
apparent surface tension,
Liquid Properties
Contact angle and surface tension. The two terms are never far apart. Run a Google search of "contact angle" right now and see for yourself. You'll often see the terms mentioned within a breath of one another because contact angle and surface tension are two approaches to surface analysis - the study of how a surface interacts with other materials or components. Generally speaking, there is also a relationship between the two measurements, one that tends not to be very clearly explained in other resources. I hope to remedy that today.
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Topics:
Automatic Surface Tension Measurment,
Surface Tension Measurement,
Surface Tension,
contact angle,
contact angle meter,
wettability,
Liquid Properties
