AFM - Atomic Force Microscopy Animation
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- Опубліковано 22 вер 2014
- Atomic force microscopy (AFM) is used to study materials by scanning over the surface with a very sharp tip.
Read more: captaincorrosion.com/2014/09/3...
The material scientists of the Laboratory of Thin Film Technology in the University of Tartu use an atomic force microscope every day to characterize fascinating materials such as invisible corrosion resistant coatings, biocompatible coatings, graphene, electroactive polymers, nanowires, DNA molecules or even a wing of a butterfly. In our recent studies we even do conductive atomic force microscopy by using special tips, which enables us to map the materials electrical properties across the surface.
All music, animations, acting, voiceovers and footages used in this video are created by us. The video or its parts can be used by anyone for educative or commercial purposes as long as it contains a reference to this original video.
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Pleasee more videosss like this!
They are really well done and animations are sooo good !!!!
Good video, it could be also nice if you explain some other modes of AFM like MFM, peak force etc. Also the constant force/height modes in contact mode and some types of data which recorded during tapping mode measurements. Many thanks!
Thanks for the video. Very nicely put together and to the point :)
Thanks so much! Your animation are really nice and explains clearly the principle.
Thanks for watching!
thank you for this, even tho it is an old vid... I actually understood how AFM works now
Question; What was the statistical software you were using to measure latitudinal and vertical readings?? Thanks
thats a great video, really kept my attention throughout
Thanks for the positive feedback!
thanks...nice animation :)
Amazing explanation, thanks!
Thanks a lot !!
very simple and easy to understand.
감사합니다~^^
Thanks for the video. It is very easy to understand.
Thnx for your lecture !
Nice Work!
Explained really well
Thanks for the positive feedback!
Thnk you so much, your explanation is clear to understand AFM basic principles
very nice demonstration! thank you for sharing.
Thanks!
Epic expressions :)
+Prashanth siddhamshetty Thanks!
Amazing!
Great Video!! Thank a lot
Very useful introduction to AFM! Thanks!
Thanks!
Great explanation... thanks!
+Charlie d'Estries Thanks for watching!
Amazing
Thank you for explanation
Thanks so much! I able to have a view on what AFM is. However, may I know how large is the size of the sample surface that we could analyze?
It depends on the microscope, piezotube and roughness of sample surface. I'd say around 40x40 microns area is largest for smooth surfaces. Some microscopes may reach up to 100x100 microns nowadays. We often studied 10x10 micron areas with the antique AFM demonstrated in this video.
Excellent video! Thank you.
Just wondering - is the laser on the same side as the cantilever attachment or the opposite side? Does it matter?
***** Thank you, Maido. Much appreciated.
Hi, great video!
I have few questions: I was wondering how to prepare biological samples, I guess it should be fixed somehow. On which medium you can work with?
***** Thanks a lot!
Thank you, this helps alot :)
Thanks for positive feedback!
Very cool!
Thanks!
nicely done !
+Joanna Krajewska thanks! Stay tuned for our premiere on January 1st for a new video about a novel materials characterization technique =)
Nice one
Wow new kind of record player
nicely done...i have read that the photo diode that we use is a quadrant photodiode.. why is that?
Thanks! It means that there are 4 optically active areas on the detector, separated by a small gap. So if the reflected laser beam moves from one area to another due to the bending of the cantilever during the scan, u can get information about the topography of the surface.
I was wondering if we can measure the electrostatic charges in nanometer scale of a non conductive material.
There are several components to natural remedies for heartburn. One plan I discovered which successfully combines these is the Amirykal Heartburn Remedies (google it if you're interested) definately the best blueprint that I've heard of. look at the interesting information .
I understand what it does, but what is its purpose its usefulness? Can it find cracks in metal?
If you know the metal then you pretty much know the surface, so why are you using this AFM to go over a surface. I think I may have missed that, but I am interested in knowing?
Is that as large as a AFM gets?
I have used AFM for the development of ultra-thin nanometric functional coatings - for the protection of metals against corrosion as well as for enhancing biocompatibility of materials. With AFM we learned about the surface roughness, which is dependent on the crystal structure of the prepared coatings and this directly affects corrosion resistance and biocompatibility. In other cases, AFM is used in a similar manner in the development process of novel memory materials for your smartphone. The general advantage of AFM is the fact that it provides you with a true 3D image in a microscopic scale, which is not possible with SEM for instance (although the images would be comparable from top view at similar scale).
A Great Job 😊😊😊
+arunima T Thank you!
thank you,its an informative vidio
great video! what about constant height mode, constant force mode, lateral force imaging, adhesion force and force modulation modes?
Hello and thank you for the comment. We do cover them in our university lecture but back when we made this video, our goal was to make it shorter as it was supposed to be merely an appetizer for a course.
@@CaptainCorrosion thanks. any advice on where I can find information on them?
My first option would be to check out "Fundamentals of Scanning Probe Microscopy" (Mironov). It is pretty thorough and might cover at least some of these topics.
Amazing thanks! And again great video!
why dont cantilever damage the sample with its sharp edge and what is use of laser
So what do we do about the electrostatic and vanderwhaals forces? Do we somehow correct for the deflection that they cause?
Aye, the feedback system with the laser and the detector will use the piezo tube to move the tip closer or further away, depending on the surface morphology, in order to ensure a) having a signal and b) that the tip isn't damaged.
Does the tip actually touch the surface? I saw another video where the tip does not actually come into contact due to electrostatic and other repulsive forces.
Hello and thank you for the question! In fact nothing touches at the atomic scale and there is just vast space between particles. So yeah, the electrons around the atoms of the tip will interact with the electrons around the atoms of the sample and repel each other. This means that no matter how much you push, the best you can achieve is the dislocation of atoms in the tip and sample but nothing is actually touching.
Thanks
thanks for the video . If I want to study more about afm what book do you recommend?
+Mohammed Ata Hello and thanks for the question! Personally i started with "Fundamentals of Scanning Probe Microscopy" by V. L. Mironov and both STM and AFM were quite nicely explained there. However, i also added a couple links to good books (bit more advanced) in the description in case someone wants additional materials.
Captain Corrosion
thanks alot :)
thanks for this nyc video
Nice....
How can you design your experiment to measure contact resistance between the tip and the substrate?
+Vishaal Zade You can measure the friction with lateral force microscopy (LFM). Basically the cantilever is tilted due to friction during the scan - more friction causes more tilting! Of course when the cantilever is tilted then also the reflected laser beams spot is in a different place on the detector and thats how you get the feedback. Try google the phrase "lateral force microscopy" for more info =) Aaand thanks for the good question too!
thank you so much for that explain .
I have 2 qwestion
1 . what the diffrent between AFM & STM
2. the Tip when be closed near to atom how the Tip can jumb the Atom ?
Hello and thank you for the questions!
1. AFM is based on the Van der Waals attraction and electrostatic repulsive forces between the tip and the sample surface. In the case of STM an electrical potential is applied between the conductive tip and the conductive sample - as a result electrons can jump from the sample to the tip or vice versa depending on the polarization. The tip and the surface need to be very close to each other however for the electrons to be able to tunnel from one to another. Nowadays both methods can achieve atomic resolution but at least in the case of conductive samples STM still has an upper hand.
2. During the scan the feedback information is monitored all the time and the distance of the tip from the sample is continuously adjusted. So it all comes down to the sensitivity of the microscope, the speed of the guiding computer and other factors.
Ah! thank you vary much teacher.
but I think AFM better than STM
becuse the STM used for metalic sample only
while AFM used for metalic and nonmetalic sample , also AFM's Tip more narrow than STM's Tip so may be its will be more accurace ,
It really depends on the application but generally the two methods complete each other. There are actually lots of different AFM and STM tips and their sharpness and quality really depends on the manufacturing company and application (type of the tip).
Thanks
+Yemna Badar And thank you for watching!
Can u explain how AFM give 3D pictures of sample
Thank you for the feedback! The main problem with making such videos is time consumption and high cost. Think it took us about 4 months to make the video about IR spectroscopy :P
People like to do illegal things :D Good job and very interesting material
i;ike u r animation vid its easy understand
Ok Wow!
can the AFM probe break? or can the probe break the sample?
+dusty lee Hello! Its a good question because AFM tips dont last forever. The main reasons for that are the breaking, dulling or contamination of the tip. Breaking and dulling happen when studying rougher surfaces. For instance, when you scan over a higher surface detail in non-contact mode and the feedback system doesnt have time to pull the tip up then you "smash" into the microscopic "mountain" and damage the tip. So the lifetime of the tip depends on the surface that you study and also on the scan parameters (scan rate, distance from surface & imaging mode - contact, tapping or non-contact). The contamination of the AFM tip can occur when fluffy or sticky surfaces are studies.. or when a random dust particle happens to be in the way.
About breaking the sample - normally AFM doesnt do observable damage to the studied substrate. However, when special hard tips are used then you can actually scratch or push a hole into the material by applying more force and then study the scratched microscopic hole with another mode. In our laboratory we measured the thickness of thin films on other substrates that way (scatch a hole into the film and then see how deep it is).
Although if you want to study the hardness and other mechanical properties of a nanomaterial then you will need to use a similar technique called "nanoindentation". In some modern AFM-s you can include the nanoindentation module (adds about 50 000 EUR to AFM price) to the microscope and do both mechanical testing and also imaging of the surface!
Nice animations and explainations. Lose the music.
wow
👌👌
how does AFM work
+alasana sanno its like touching a surface with a finger with your eyes closed and trying to imagine what the surface looks like! But in order to touch the nano-world you have to use instead of a finger a needle that is so sharp that it has a single atom in its tip =)
Thank you
+Captain Corrosion ...nice description..
I getting iron man feelings while watching this
physics homework be like
Kavli brought me here
What's up with this off beat rhythm damn
Wooww
Please laugh
Great Video Thanks!!
And thank you for watching! Stay tuned for our next video about elemental analysis, which will be published in near future =)
Amazing