2 The Principle of the Electron Microscope
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- Опубліковано 28 вер 2024
- How to Make a Microscope, Chapter 2
Unlike the optical microscope, the scanning electron microscope uses accelerated electrons in a vacuum to act as light to view the sample. An electron is the negatively charged particle of an atom orbiting around a nucleus. It can be released by heat or an electric field. Electrons are 2,000 times lighter than the smallest atom, thus they can be easily stopped or diverted when striking materials. Because electrons move freely only in a vacuum, there must be a vacuum in the entire column. To achieve this state, vacuum pumps are used along with various levels of vacuum. Dozens of millions to billions of electrons hit the sample per second. Electromagnetic lenses then focus the beam on the examined sample in an optimal way. During its journey, the electron beam passes through a number of apertures with various diameters, which stop electrons undesirable for creating an image. The electrons can either scan the sample step by step or go through the sample to show its inner structure, giving us the distinction between a scanning and a transmission electron microscope. Modern electron microscopes not only display, but also analyze, measure, and modify in 2D, 3D, and 4D.
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"I probably understand..."
1:10 "Mmm intra-sting!"
great explanation...thanks for the video.
So you are saying I won't be able to build my own using 3d printing and some off the shelf components? That's a bummer. Maybe in a few decades it will be possible.
Don't listen to skeptics, just try it! 😉
Tungsten is at TIG welding stores...
Electronic components are at Farnell, Arrow, Mouser, TME, RS Components, everywhere...
Vacuum is absence of air, so just get rid all of it!
nice drawings, now can we see a real action of electron microscope showing viruses??? How they are putting the sample into the microscope, how does the virus survive the vacuum and the electrons temperature?
Generally speaking samples don't survive the vacuum chamber or electron beam. This is one downside of Electron Microscopes, they can generate images of incredibly small things but the samples are consumed/destroyed in the process.
@@youtubeisapublisher6407 Samples are destroyed or not. We should be able to see them.. All in theory, in real world." I told you so" :)
@@JayDee-b5u Whatever a human eye can see, is recordable. Tell em to show us as it is. How they see and how it is dead etc. A to Z.. Can you tell me am I the ONLY person in the word who thought of this? :)
@@JayDee-b5u That is why I don't care about their science delusion. Science is not academia, if they can't answer the questions outside, they should keep their stupid knowledge for themselves. We don't need any of their titles such as PHD.
Thanks
Why does this feel like an Ad?
thanks mee brus
WRONG! Electrons are conjecture, individual electrons do not exist. And can someone explain what a field is ? HAHA. NOp.
This is like trying to use a potato to take a picture of the moon. Garbage technology.
whats up with the corny dorky fake conversation.. super distreacting.
Plebeian opinion. The fake awkward conversation sells the video.
For such a complicated topic, the female presenter talks to the audience like they're 5 year olds
Thats women for ya😂 power trip
I feel like somebody out there on UA-cam could do a better job explaining this.
Who
@@hardikkadd6301 You
@@DGCMWC how
@@hardikkadd6301 haha idk
@@DGCMWC 🤨
although the video is good conversation is quite dumb the female companion is telling about the ways of detection after not even knowing what electron is
Uh...the paper discussing particle / wave-duality was not published until 1924. How could have people known that electrons have a wavelength in 1920 ? Oo (1:40)
Am I missing sth ?
You are just gay
Epic roast
Glass completely empty burn!
@@korbose7859 gay isnt even an insult. What if they are gay? Whats wrong with that?
@@localnonbinaryprussianbowl3350 shut up you little softy
10,000 I thought the limit was around 2000?
Whoever invented the electron microscope deserves a medal. 🔬
You need to read up more on the Nobel Peace Prize
@@OZTutoh he is surely joking
He did got one
great video,thank you so much!
So this big ass machine is called a microscope???
Nigga this a fucking megascope!!
Una pregunta (a cuestion) por que no lo doblan al español ? O le ponen subtitulos a todos estos videos fregones que vienen en el idioma de Shakespeare este humilde totonaco que les escribe no domina dicho idioma
So, optical microscopes cannot distinguish SARS COV 2 viruses and neither can the electron microscope.
sounds like mordecai from regular show
I thought it was an espresso machine
wait so what are the major differences between the 2 types?
Where do they get the electrons from?
What sort of atoms do they use? And do they detach the electrons from the atom?
They heat up tungstein to 2700 degrees and send 300kv through it. I think.
Metals are called conductors because their atoms tend to lose electrons compared to non-conductive elements. Electrons absorb thermal and electrical energy, and discharge that energy by vibrating and also in the form of photons; some of the outer shell electrons in the atoms of metals tend to be ejected from the atom for this reason.
I know the reply was a year ago, but anyway, I hope you find it useful.
@@noppo4445 you helped me tho, so thanks :)
Gonna take a 5 point minor in this next year
got me through my nanotech exam
Informative video. Nicely done!
great tutorial ,like this alot
Anyone in 2019
I am 8 months ahead of you
11 months
2047!
@@lukasgill2329 acha Corona ki vaccine kisne banayi😂😂
Animation is irritating.
Why the music omg
Omg what!
Cool
Good very good
Great video! How can I get contact with the person/team who make this great video?
Why? Do you need help with something?
@@oedihamijok6504 yes! im from NNP application, i would like to get in contact for future development
@@oedihamijok6504 many thanks! Is it you who make it ;)
Hello, we made this video. Thank you for kind words. Our creative company FILMONDO is based in Czech Republic. We make this for TFS in Brno. If we can help, please let me know.
Female finishing PhD in cryoEM... why is her voice 1:55 „hey who is this handsome fellow?“ can you stop portraying women as such idiots please?
Also this could have been simplified for a better explanation.
If it was a man asking the same question, he'd be portrayed as gay.
@@OZTutoh and?.whats wrong with being gay?
Btw we dont know if the person asking the questions is a women, since biological sex isnt the same as gender. They could be non binary or trans or genderfluid!
@@localnonbinaryprussianbowl3350 I have this suspicion that you're serious, while your name screams at me that you are not.
@@OZTutoh well i am serious. My name is just a meme, but it does not mean that im not serious
@@OZTutoh im just saying the female speaking person could be nonbinary or genderfluid or anything else.
All im saying is we cant be sure if they are a female
Thank you very much
nice explanation 👍🏻
Thanks for the scientist inventions
Well articulated video.
I am happy to see
Good work
Excellent
excellent
Kinda sexist
Carlos Andrés Why lol
Every conversation must now be the woman being the one explaining and the man being the idiot otherwise she is a sexist symbol of the other 4,000,000,000 women on the planet?
How???
1:51
Right so....vacuum tubes, got it
Is the female voice in the video making the dumbest remarks supposed to amuse anybody?
And when she does get it and says something smart, she always needs to be validated by the male voice "that's correct". He is the "authority" she is the "subordinate". Such old role-models should be outdated by 2016.
I thought you had some form of opinion but halfway through I figured it was just about genders.
Amazing