Scanning Electron Microscope

[jayejayeee]

interesting video and very informative

[aspire080]

good 1 it saved my time

[miki4630201]

This sounds like a photocathode of an x ray fluoro tower!

[godrocksmyshoes]

what is a major discovery in science that was discovered using a scanning electron microscope?

[Pandapie100]

Why did they say you need a TEM to take those pictures when those pictures were SEM pictures???????????? :( that was disappointing to see.

[huynhcg]

Really helpful! Thanks!

[RawrSquidTacular]

"If you think thats disdusting, these are its mouth parts." lol, mouth parts.

[doralover10]

i like the part which shows how the signals were turned into an image!

[AgentDexter47]

how do you gold plate a dog flee?

[1001011001001010011]

@AgentDexter47 One possible way is by placing the specimen in a vacuum chamber and boiling the gold, which condenses on the specimen. Here's an excellent video demonstrating this: youtube.com/watch?v=7dF0QTzcua­c

[GONAVY26]

Of* the video a cathode,

[GONAVY26]

In the video, you said anode attracts the negatively charged electrons. Isn't the plate at the beginning ok'd the

[ahmadassem]

why it is coated with metal

[acmeschool]

@ahmadassem

The metal coating is required to reflect the electron beam.

[clarkejones31290]

@acmeschool i was told to make it conductive

[MonCoin]

@acmeschool The coating is to make the sample conductive. Some samples are not, and the result might be that you build up a charge on it, where the electron beam hits, and you will burn a hole. Therefore a coating.

[udayrabi]

@ahmadassem to conduct the gathered electrons on the surface of the sample to the ground.

[jsquad192837465]

I aint lookin at one of them picture tubes im lookine at one of them LCD tubes

[iamsnail]

Thanks for sharing.

[Blankku2]

The technology has indeed been improved greately since this video was taken.

In a TEM it is possible to see the shadows of rows of atoms aligned in a crystal so that it appears that you see single atoms.

[felixthemaster1]

sorry but, how did they gold plate a flea?

[Virginityrocks]

Probably shaved a dog.

[felixthemaster1]

yes. but gold plated? _o

[colormestupid798]

@felixthemaster1 they vaporize it onto the flea at a high vacuum.

[felixthemaster1]

lol, kind of a waste of gold. but technology has aadvcanced soo far

[rathat48]

not even a cent worth of gold

[koma312187]

Very informative. Thank you for sharing this video.

[danster2001]

nice vid.

i was wondering, what are the advantages and disadvantages of using a electron microscope?and what can be seen under a electron microscope?

[acmeschool]

Hi Danster,

From memory 20 years ago: The electron microscope can see things that are smaller than a wavelength of light. I think they are seeing actual atoms now, but I haven't kept up on this. One challenge is that the sample has to be made to be electrically conductive, so you can't just stuff any old thing in it.

[sswio]

I think the scanning tunneling microscope (STM) is probably how atoms are being viewed.

[italouruguayricano]

@acmeschool actually not single atoms (for that you need a Tunneling microscope) but you can see clusters of atoms at the nano size.

[acmeschool]

@italouruguayricano  Thank you for the clarificaztion.

[polarbear60]

Very small particles can hide in the peaks and valleys of light so they are not visible to us, however electron microscope has very frequent wave, so no place to hide for little particles.

[hgfuhgvg]

@danster2001 The disadvantage is that you will see things (such as the organizm here) that may give you nightmares.

[vezac]

what a king of camera is that?

[acmeschool]

That's your basic JVC KY-2000 with a barbeque-spit motor glued on the side. The big wind-up key is actually from a wind-up Bell and Howell 16mm film camera.

[millygirl]

nice video...i'm watching this for my job interview preparation tomorrow :p

[acmeschool]

Glad to help, but remember that this video is a good 15 years old. I hope those gizmos still work like that. There's probably a computer hacked into them somewhere these days...

[itsacorporatething]

I got to this video because a representative from a electron microscope company came in today and brought a portable one. It was entirely controlled by the computer and completely automated for you. all you had to do was zoom in and out and tell it where to point and the picture would come up on the screen. It was the most intuitive design ever!

[LuminolBlue]

Nice vid; thanks for sharing.