Filtration Resources
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April 10, 2019
Membrane Distillation (MD), an emerging non-isothermal membrane separation, is a promising alternative to energy intensive separation techniques such as Reverse Osmosis or Distillation.1 In this publication Sarah Azari, Application Engineer, investigates the current state of MD technology, Sterlitech’s role in the membrane distillation product development, and potential areas of future research in her recent whitepaper.
Though the technology has been around for more than 50 years, membrane distillation processes require continued development for industrial implementation. Developing high performance membranes and optimizing the process design for large-scale operation are two major challenges precluding widespread industrial application.
For the past ten years, Sterlitech has been active in equipping scientists with tools, membranes and systems, for exploring membrane distillation applications. We hope
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April 10, 2019
Nobuto Blood Filter strips are an easy and portable method of collecting wildlife samples in the field. Typically used by researchers in diagnosing common bird diseases, they can be utilized in testing wild animals for a whole host of zoonotic pathogens including toxoplasmosis, hantaviruses, measles, plague, and tularemia.1,2 In fact, scientists often collaborate with local hunters and trappers to collect data from their harvests.
Made from high-purity cellulose fibers, Nobuto filter strips are structured for uniform sampling. Each strip holds approximately 0.1 mL of blood or 0.04 mL of serum.
Once blood is applied and the strip has dried, researchers can analyze, store, or mail the samples without refrigeration. Downstream testing for antibodies (i.e. ELISA) is employed to diagnose disease.
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March 05, 2019
Are you interested in learning more about the membrane filters you use in the lab every day?
Tune in to Sterlitech’s upcoming webinar on April 9th at 8:00 am PT. This webinar will provide an introductory overview of microfiltration membranes.
Join our filtration experts as they discuss characteristics and applications for membrane filters and answer any questions you may have.
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You'll walk away knowing:
- What microfiltration membranes are and how they work
- How to decide which
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March 05, 2019
Electrical Conductivity is the ability of a solution to pass an electrical current. All ions present in a solution contribute to the conductivity measurement. How well a solution conducts electricity depends on several factors such as concentration, mobility and valence of the ions present.
Electrical conductivity measurement using digital conductivity probes is generally a reliable, sensitive and low-cost method. Surveillance of feed, permeate and reject quality and estimation of the total number of ions in a solution in the membrane filtration systems can all be performed using online and real time conductivity measurement techniques.
Unit of Measurement for Electrical Conductivity
The unit of measurement for electrical conductivity is commonly used as one millionth of a Siemens per centimeter (micro-siemens per centimeter or µS/cm). When measuring
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February 15, 2019
As scientists and as a society, we have become increasingly aware of the negative impact of human’s activities on
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November 30, 2018
Join Sterlitech's membrane and process development scientists for a live webinar presentation on our membrane test skids.
We will be discussing how our customizable test skids can enable you to explore new filtration applications in the lab. This webinar will provide an overview of the features and applications of the product line, with a special focus on our multi-functional Convertible Test Skid. We will also have plenty of time for Q&A after the presentation and look forward to answering any questions.
Click here to sign up and learn more about our speakers! -
November 01, 2018
Sterlitech has recently discontinued sale of the MS7-Pro Analog Magnetic Stirrer from Scilogex. For fans of the MS7 model, we recommend the MS7-H550-Pro Hotplate Stirrer.
If you're looking for a comparable stirrer (and don't need the heating function), we still have a selection to choose from in the Magnetic Stirrers & Hotplates section of our website. We are happy to assist with finding the right stir plate for your lab - please contact us with any questions!
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September 04, 2018
Have you noticed how your membrane performance is affected by the operating conditions? Depending on the type of membrane separation process, operating conditions may include hydraulic pressure, osmotic pressure, temperature and feed cross flow velocity. Operating conditions can affect both permeate flux and solute rejection. Among these parameters, permeate flux is very sensitive to the feed temperature. Permeate flux increases as the feed temperature increases. This is mainly due to the decrease of feed viscosity with an increase in the feed temperature. More specifically permeate flux typically increases as temperature increases in a linear relationship with viscosity as described below (1):
In this equation, J is the permeate flux through the membrane, m is the feed viscosity,
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August 10, 2018
Sterlitech offers bench-scale membrane test cells that can be used for a variety of filtration applications. The Developer series are the largest cells used with Sepa size flat sheet membrane coupons, i.e. membrane active area of 140 cm2/24 in2. The Explorer series is used with CF042 size flat sheet membranes, i.e. membrane active area of 42 cm2/6.5 in2. The Innovator series are the smallest cells used with CF016 size flat sheet membranes, i.e. membrane active area of 20.6 cm2/3.2 in2. All three series of cells are available in a variety of material of construction, including: Stainless steel, Hastelloy, Delrin, PTFE, Acrylic.
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August 09, 2018
Because they have similar outward appearance, it is easy to presume that the various microporous membrane filters and flat sheet membrane filters offered by Sterlitech have similar pore structures. Some consider symmetry to be the epitome of beauty, but with respect to filtration, it’s all relative. In reality, there is a rich variety of pore structure morphologies resulting from the techniques and materials used to manufacture the membranes.
For the microporous membrane filters, the pore structures range from the essentially two-dimensional screen-like structures of the polycarbonate and polyester track-etch membranes, to the node and tendril structures of the expanded PTFE