Hydrophilic Coatings Webinar Available Online

Posted by Josh Simon on Fri, Sep 23, 2011 @ 02:11

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An archive of the webinar we recently announced on hydrophilic and hydrophobic coatings is now available to everyone for download.  Please stop by and grab the file and listen to it.

Click here to download the hydrophilic coatings webinar.

The webinar was sponsored by Biocoat and Specialty Coating Systems. Half of the presentation by Josh Simon is actually about hydrophilic coatings and the second half by Lonny Wolgemuth talks about hydrophobic coatings. Remember, hydrophilic means "water loving". Hydrophobic means "water fearing". The webinar sets the record straight on which is which and why you would want to use some in specific applications.

For both coatings, lubricity is discussed, i.e. how slippery they are respectively, as well as some basic mechanical properties and medical device applications. 

All in all, I am told this is a pretty good overview of coatings, and it is a nice place to start if you are just beginning your research on this area for possible future products or medical devices. 

 

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A Lubricious Coating That Has Dry Lubricity

Posted by Josh Simon on Tue, Jun 14, 2011 @ 11:04

Here is another question that comes up sometimes:  Do you have a coating that is lubricious when dry?

dry lubricityMore often than not, these questions come from non-medical professionals who want to use the coating for a piece of machinery, rather than a biomaterial which interacts with a living system.  In other cases, the device is for a machine that is used as part of a medical device that has moving parts.

The easiest answer to this question is "no", because hydrophilic coatings accomplish their mechanism through formation of hydrogels on a microscopic level, which closely associate electrostatically with water and lower friction.

The more precise answer is actually a question:  What do you mean by lubricious?  How slippery is slippery enough?  Ok, that is two questions.

Let's put things into perspective and talk about coefficient of friction on a surface.  The coefficient of friction of teflon is about 0.2 to 0.3.  The coefficient of friction of ice is about 0.01 to about 0.1.  The coefficient of friction for most hydrophilic coatings for medical devices ranges from 0.01 to about 0.1 also.  Some hydrophobic coatings like Parylene have coefficients of friction ranging from 0.25 to about 0.4.

If you want a coating that has a coefficient of friction in the 0.01 to 0.05 range while dry, you are basically out of luck. You may want to try a lubricant like silicone oil.  On the other hand, if friction in the range of 0.2 to 0.3 is ok for you, then you want teflon or parylene.  The drawback there is that these are hydropobic not hydrophilic.

In some cases, there are hydrophilic silicones that can have coefficients of friction around 0.2.

Tags: lubricious coating, Hydrophilic Coating, parylene, hydrophilic coatings, lubricious coatings, silicone spray, dry lubricity