At 6:15, the cosine of a greater angle if they're both less than 180 degrees will always be less. Shouldn't you then compare the absolute values of the cosines?
It depends on how you define hydrophobicity, Conditions to be super-hydrophobic are;- 1. WCA>150 deg., 2. low CA hysteresis 150 deg with Wenzel state for moderately rough surface with introducing hydrophillic nano-spikes or by other means. The conclusion is, yes, hydrophobic coating can be in Wenzel state but will definitely show highly adhesive superhydrophobicity.
How can I make a surface Cassie-Baxter rough? (With regular tools and materials) or do I need a really expensive laser etching machine, an electron microscope to verify the surface, etc?
I did an experiment on ABS plastic, the contact angle of smooth ABS plastic is around 70° which means hydrophilic surface, but when I treated the surface of this plastic by grinding using sandpaper 240um and 400um, the contact angle of the ABS plastic grounded is more than 90° ''around 100°", which mean the surface become hydrophobic. So, how can you explain these results ?!! and thank you so much
Excellent! And what you told about the desert beetle left me wondering how evolutionists can fool themselves to think that this highly engineered surface can happen by random chances.
That was incredibly helpful and well done.
this is literally the best video about the topic
One of the best videos I have ever seen.
Amazing video. This would have saved me an hour of reading wikipedia.
This is what I have been doing in these 2 months!
Studying the water droplet behaviours on surfaces.
well summarize and easy to understand
Great Explanation ! - More please !
Thanks a lot. Great job. Superbly Explained. I am exactly looking for this video!
Very well explained, and equally appreciated.
Cool , highly appreciated!
I know this was 11 years ago but it was still very clear and easy to understand! :)
Superb explanation
is this the same lady who made the videos about leaves using phi to grow efficiently?
Thank you! u're a life saviour!
Great explanation. Thank you!
Amazing video. Nice explained
superb video... precise and concise
Thanks a Lot. Can you also provide some link or anything on the derivation of the cassie baxter and wenzal equation
At 6:15, the cosine of a greater angle if they're both less than 180 degrees will always be less. Shouldn't you then compare the absolute values of the cosines?
Great job!
That was an amazing video which helped me a lot. Thank you!!
Amazing
Thank you for this video ! it helped me a lot :)
wow, im not even 14 yet, and i found this fascinating!
Since you're 18 now, how do you feel about it after so many years?
@@Kcd1306 lol true
are there any textbooks out there that addresses this topic?
Also, at 7:06, is it supposed to be the decimal of the solid?
The best one ever.....
is it possible for a superhydrophobic coating to be in wenzel state?
It depends on how you define hydrophobicity, Conditions to be super-hydrophobic are;- 1. WCA>150 deg., 2. low CA hysteresis 150 deg with Wenzel state for moderately rough surface with introducing hydrophillic nano-spikes or by other means. The conclusion is, yes, hydrophobic coating can be in Wenzel state but will definitely show highly adhesive superhydrophobicity.
6:09 is wrong i think. When Cos(theta*)>Cos(thetaE)，we get theta*
How can I make a surface Cassie-Baxter rough? (With regular tools and materials) or do I need a really expensive laser etching machine, an electron microscope to verify the surface, etc?
Hi, just coating your surface with superdrophbic coating
Mind=Blown
All these people saying thanks for the simplification.
Here I am thinking, "she's going too fast!" lol
what is the disadvantage/side-effect of superhydrophobe ?
I did an experiment on ABS plastic, the contact angle of smooth ABS plastic is around 70° which means hydrophilic surface, but when I treated the surface of this plastic by grinding using sandpaper 240um and 400um, the contact angle of the ABS plastic grounded is more than 90° ''around 100°", which mean the surface become hydrophobic. So, how can you explain these results ?!! and thank you so much
Wow so smart
No, that was Vihart.
Excellent! And what you told about the desert beetle left me wondering how evolutionists can fool themselves to think that this highly engineered surface can happen by random chances.
I want to model in comsol can anyone help?
Wait, what?
That is what I thought. Um...
Don't call them unhappy molecule..... Just no.
amazing writing horrible sqaure lol, i mean its square paper how cna you miss it