Laser Dye at Halloween - Periodic Table of Videos

[TheDigitalStone]

"3..2..1 *Boom skeleton appears*"

I lolled so hard!

Neil is so cool :P

[bnew241]

thanks mate

[kylebossify]

I know a certain biochemically produced substance that flouresces quite beautifully

[elmotouchesme97]

@kylebossify haha. I wish I was a seaman.

[soberek]

Ice cool Neil, as usual. When he ripped open his coat I expected to see a Superman or Punisher t-shirt. Instead I've got a brilliant acting audition for Ghostbusters III. Or Addams Family. And still not a word spoken...

[osmo250]

i love how even the Professor has trouble pronouncing the chemical at the end...

[tapelegs]

for what reason would someone want a florescent material designed specifically for lasers?

[EducationLover]

why is Niel always like this: :) then after 2 sec. :|!!! :s anyways he is the best assistant :D

[alch3myau]

I didnt see any Lasers :/

[andylover869]

Einstein!

[zurechtweiser]

"Du bist toll" - Ich wußte nicht daß der deutsch kann

[KirstFreak]

Neil deserves a pay rise

[beekayproductions]

he's truly the STIG!

[hackum1]

Neil is 3 parts sexy to 1 part scary.

[XxClaugiexX]

0:26 wow! is that his real hair...

[shotofsambuca]

Lovely hair...

[ligerx45]

Almost at 365 public videos Brady! Isn't it exciting, but I feel robbed of life knowing i've watched them all once(most twice)and three times when i'm a bit bored :D

[thechemist144]

If you want to see the structure of Coumarin 540A you can search for the compound in ChemSpider.

[scouseology1]

blimey the head on him

[mychairmadeafartnois]

A skeleton suit is fancy dress? Man, I want to go to those fancy parties.

[THEIRONMAN9]

his hair is a scientific experiment !

[sUpErHeRo15xx]

Shit, it's Einsten!

[DrumTrimmings88]

Haha, I've been watching these periodicvideos for nearly half a year now. I didn't know where it was based.

Now I'm studying there, how funny.

[MrProjectdjim007]

Pls tell me that ain't your hair..

[ElectricDoctor1]

Neil+Laser+Shiny Head = dangerous reflective surface

[yusukeshinyama]

Neil + Laser = Neil win.

[Yvo19]

I dig his hair.

[HugoJanKanAl]

Neil's a laser expert? Just when I thought he couldn't get more awesome.

[HugoJanKanAl]

I like how the professor doesn't get the full name in the end of the video. It gives me hope for my exam.

[kingkaise]

to chemist cellebrating the year of chemesty

youtube.com/watch?feature=play­er_embedded&v=6jf3Bvqz5xw

[15rich26]

I was in that room on school trip at Nottingham university and they were trying to get us to join them next year !! :)

[imalwayswatchingu00]

@Yellowisgood2011 sometimes, this is still educational, just more fun :)

[cybermods]

i cant watch this video because of that idiots hair. it might jump threw my screen and eat me.

[punishedexistence]

@cybermods I'm sure by "Idiot", you certainly can't be referring to the Professor...Of course anyone who spells through as threw wouldn't recognize the reason for his hair.

[adventuresofbo]

that man reminds me of Einstein

[nibrobb]

"one" own?

[Teghead]

@nibrobb

Yes -one like own/ohn, not -one like wun. It means there's a ketone group on carbon 11... I think =s

[brainstorm90]

@Teghead it's right!

[nibrobb]

haha, really nice

[magiclion7]

OMG I'm LEARNING!!!! it's like being back in a chemistry lesson lol

[rectify2003]

All that technology, and he cant work out how to use a brush?

[edj66]

HAIR!

[madduck09]

is that his actual hair or a costume?

[XtremeVideoReviewer]

Nice hair.

[suckergettecity]

Great Scott Marty!!

[darragh19871987]

its people like that old guy that made school boring !

[DRIODBOY]

My god its the doc from back to the future!!!! Wheres marty mcfly?

[obione888]

What a fantastic hair do :)

[sabh001]

thats gotta be a wig if its not

for fucks sake get it cut

[Tw4tz0r]

WHAT IS THIS BLACK MAGIC?!

[herehavealook]

Great scott!

[Pesky35]

That is the most boring U Tube clip I have ever sat through. Quite literally watching paint dry. Why?

[HLecterPHD]

Is that Doc Brown from back to the future?

[djxeno0807]

the entire time i had the voice coming out of the hair. how is this not a separate animal.

[3doog]

A formal introduction of Neil is in order.

[scottswan]

Anyone remember which video the prof showed a brief picture/description of a never replicating floor pattern? Thx

[Alfalotter]

@scottswan Nobel Prize for Chemistry.

[scottswan]

@Alfalotter Much thanks!

[Hellothere212121]

So Neil works with lasers huh? I suddenly find myself thinking he'd make a great Bond villain.

[themaneatingchimp]

Nice to know that when the work dried up in the circus, BoBo The Clown found a nice little job at the local university.

At the moment he's busy working away with his team on a clown car that's powered totally by Deuterium nuclear energy.

Also available for childrens parties, fates and fun days, competitve prices satisfaction guaranteed, full CRB disclosure and references.

[zhightimezz]

dude... find a barber

[EmpereurNapoleonex]

@zhightimezz what are you talking about bro? that hair is awesome

[ThatGuyFromAustria]

3:10 "What do you think?" That Neil seems to have lost some weight.

[Jeansieguy]

"Du bist toll"

[TheStrosso]

¿Neil?. He is not Neil, He is Dr. Emmet Brown, bald from radiation from the first model of the Delorian that used Plutonium.

[gabiotta]

Literally unbelievable, my mind is blown, like literally blown.

[RelativelyHostile1]

she has a very manly voice oO

[mintiefulable]

0:26 MAD SCIENTIST!!!!! O.o

[redzer06]

what if it rains

[harryknotter]

You can also use a chemiluminescence: a reaction which generates the needed energy in stead of UV-light. That would be even greater: it will light up without using UV-light, just by spraying hydrogenperoxide on the area's which are painted. Just make sure you don't get it on your skin though ;)...

[Giraffeiful]

hey Brody, is there a chance that you will be creating a channel about Astronomy? If not, do you have any suggestions for channels that talk about Astronomy in ways similar to these videos?

[mrblisterfist]

:2,3,6,7-tetrahydro-9-(trifluo­romethyl)-1H,5H,11H-[1]benzopy­rano[6,7,8-ij]quinolizin-11-on­e

[mrblisterfist]

@mrblisterfist Eh, ya beat me to it! :)

[BarneySaysHi]

You guys should make a video about the old fashioned lasers. Preferably a ruby one.

[G3org3Master]

Yellow = bright blue!!! orly??

[MrDimebagdarell]

That last part, quiniolizin- 11 -one, maybe the quin as in quinine? Also fluorescent under UV?

[fugehdehyou]

His just like yeeeh neil we're done here laters dude this sucks

[xspxmcrxfftlx]

holy moly the end i just learned or sort of understood the basics of naming in organic chem n that name at the end just confused me to no end hahhahah wish the professor was my professor i would learn so much more than i am right now

[4jonah]

Cant you change laser colors, not with dye, but with changing the wavelength of the laser itself?

[kurtilein3]

@4jonah

no, normally one laser gives off exactly one wavelength. Only some specific wavelengths are available. Then you can use a special crystal that will double the wavelength, for example from red to green or from blue into UV. If you need a specific wavelength for which no laser exists, you need to build a dye laser.

some lasers, like CO2-lasers, can give off different wavelengths, but they are useless for science because they give off a range of wavelengths, not one highly specific one.

[kurtilein3]

@4jonah

... second comment

so if you need a highly specific wavelength of laserlight, chances are very high that no laser exists that produces the exact wavelength you need. Then you need to search for a dye+solvent that gives off the wavelength you need, and you send a shorter wavelength pumping laser into it. Then, when you have exactly the wavelenth you need, there are ways to amplify it. Thats complicated, but often the only way to get a powerful laser of just the right wavelength.

[killer2611]

IMA FIRE'N MAH LAZERS!

[Sockheadableful]

We should really make a video about neil.

[seantfu]

Where is the Professor sitting while he talks? Thanks! :)

[Zee96969696]

I'm scared of Neil

[fegolem]

What wavelength is that UV light? Are these dyes more or less fluorescent at differing bands of UV, e.g. 245nm vs 365nm ?

[Eldejot]

Once again Neil is made of pure awesome.

[culwin]

When Neil ripped his shirt off at 2:51, I thought some stuff was about to go down.

[Gmc42082]

i wanted to see them use the dye with a laser :(

[MrSeanMDickinson]

Her accent always makes me laugh !!!!



[mrsamsa]

Sam is quite the painter :)

[mackinnon182]

Your gonna have to do gunpowder or something for 5/11.

Good work!

[runnybabbit12]

when he says washing powder does he mean detergent?

sometimes the british way of saying things throws me off

[ArgylePenguin]

Neil is a laser specialist? Neil's badass rating just went up 50 points

[DementedDogStudios3]

haha horrible movie

[cr0ss0ut]

so many mysteries about Neil,

Some say hes a university Chem Teacher,

Others say hes bald and wears his skeleton on the outside.

All we know. Hes Called the Stig.

[LilReaper1010]

OMG! Neil is the STIG!!!!!!

[Jiddy12345]

@LilReaper1010 Some say that his breath smells of Magnesium...

[thetaylor82]

Hey guys and Sam, great video again! Neil looks like he has the November 5th look of excitement in his eyes already.

[gulllars]

Isn't this just a specialised version of fluorescent UV dye?

You can get the same effect with text markers too, though that is visible in normal light too. They sell "invisible markers" that are only visible in UV lighting.

How about a dry ice trick for halloween?

[SethSimpson]

Once again the professor proves that chemical nomenclature is his Achilles' heel.

[Foxclass]

Do laser dye molecules work the same way as something like an Nd:YAG crystal? I.e., are they truly a lasing material or just highly conjugated fluorescent molecules?

[unoriginalname4321]

@Foxclass The dye is the gain medium. Dyes, unlike Nd, have a much wider gain bandwidth (i.e. they can laser over a range of colors). Tuning is achieved by having a dispersing element (like a grating/prism) inside the laser cavity so only one color goes through the cavity. Change the angle of that element, you change the wavelength allowed through the cavity. To change the wavelength range of the laser, you change the dye solvent or the dye itself.

[Foxclass]

@unoriginalname4321 Oh I see, so tuning is achieved though interaction with the solvent since it affects the emission wavelength of the dye molecules. That's incredibly useful I suppose, in the sense that you don't need to rely on frequency doubling with BBO or KTP to achieve different lasing wavelengths. With this you actually have a range of wavelengths intrinsic to the dye! That's great stuff!

[unoriginalname4321]

@Foxclass Not quite, think of one of the laser cavity end mirrors as being a diffraction grating. At some angle (of grating) it will reflect one wavelength(wl) straight back (like a mirror) while others will be reflected elsewhere. That wl can lase since it's the only one that can bounce between the end mirrors. If you want to change the wl you tilt the grating more/less. Each dye can lase over some range. If you want to change that range, change the solvent or dye itself. Fine vs course tuning

[Foxclass]

@unoriginalname4321 Gotcha. Clear as day now. Thanks for the clarification!

[KillermaTV]

Does the heart in the background of the professor say "du bist toll"? : 0:55

[dgfia]

Sam, good to see you again, I hope your achilles tendon has totally healed up now....

[666Xeres]

Neil + Laser? No surprise here.

[rietveen26]

1:29 ''a nice vibrant yellow'' otherwise refered to as ''pee''

[gbponz]

Did you notice that Neil is actually the lost twin of Christopher Lloyd in "Back to the future"?

[fuckoverload]

i i or i j?

[MuadDib1402]

Is your achilles tendon totally healed up now?

[Damianingus]

drawing the molecule with the ChemSketch looks like the nitrogen has to support some stearic pressure

[sliver321123]

2:47 : Smile initiated

2:48 : Smile complete, deinitializing smile.

[forsurenoob]

@sliver321123 haha, i noticed that too.

[absolite]

@sliver321123

absolutely clever..

[Draxis32]

I mean, you gotta give to IUPAC that they at least tried to resolve the problem with the names of organic compouds.

[DeoMachina]

2.51

TAKE IT ALL OFF

[ulkord]

at 0:59 there is a gingerbread heart which says " Du bist toll" its german and basically means " your'e great "

[paranorma1palace]

those books look like they could fall over and kill the prof any moment, if it happens, please can i have the tie :)

[LegionForTheLulz]

"Du bist toll" (on the heart in the background) - I agree!

[docatomics]

...one rib to many sam

~we wanted you to model the skeleton

=you did ask what eye thought, LoL ?

[TheMobiusTrap]

One knows the chemical name for a substance is beyond complex when even the Professor does not understand the full description... :O

[endimion17]

@TheMobiusTrap No, it doesn't have to mean that. Chemist are not required to know that unless they work on a certain compound.

IUPAC organic nomenclature exists as a tool. Nobody knows everything, and there are lots of way more complex molecules than this one.

[TheMobiusTrap]

@endimion17 That is true. At least though, nobody has been asked to read out the chemical name for Titin. We'd all be all day. XD

[MrSuednym]

Is that the Professor's house?

[JoshMr07]

I didn't get it. don't you design the colour of the laser by engineering the band gap/ effective energy barrier of the quantum well by changing the concentration of say Al in AlGaAs/GaAs.

[Sep3lio]

@JoshMr07

I'm not hugely knowledgeable about lasers but I imagine if you had an old style argon laser or something like that at a fixed ultraviolet wavelength it would be much easier to alter the wavelength using the dyes rather than changing the laser itself.

[JoshMr07]

@Sep3lio i suppose it is used in changing the wavelength of laser since buying a new laser with a particular colour is much more expensive.

[TheFinnGamer]

Awsome "Du bist toll" Lebkuchenherz in the background

[yertletheturtlemay]

i learnt more from the periodic videos than 1 year worth of chemistry lessons at school

[Johannesmania]

@yertletheturtlemay That doesn't speak for periodic videos but against your educational system.

[Johannesmania]

@periodicvideos At the cupboard behind you is a caption that says "Du bist toll". Do you speak german too?

[AvatarofthePot]

@yertletheturtlemay Maybe because here you pay attention?

[EntrE01]

@yertletheturtlemay you've had only 1 year of school chemistry? what shitty kinda school did you even go to?!

[ubercomix95]

@yertletheturtlemay learnt, should have paid attention in english class XD

[WeaselWJ]

@yertletheturtlemay You must not pay ANY attention in class then.

[jeebersjumpincryst]

@yertletheturtlemay i know you and the 115 odd ppl are just showing support for pv, but it makes it look like you all never attended a single chem class in a whole year. like all yr chem lessons, you will have forgotten what you learnt from this edutainment vid in a few hours, and will have forgotten even ever seeing it in a day or two, like all tv. sorry to seem so harsh, but not many ppl will pay you a wage for watching vids. you need real value, even if its digging ditches.

[yertletheturtlemay]

@jeebersjumpincryst i do pay attention to school its just the teacher makes us copy from text books so we dont learn much and anyway from these vids i make notes and review them time after time and i aslo make notes from the books at school and review them too so i don't forget but its just that we never did any good experiments at school so the closest i'll ever get to an experiment is watching periodic videos. so i hope that can explain why i wrote that

[crimsoncoin]

why does a laser beam seem to go on for ever, its clever chemistry

[fbpoulsen]

Whoa nice video! So these dyes are used in combination with a UV-emitting laser, if I am correct?

[lisapratt1]

nice video....interesting!

[billytisme]

Why does lemon juice glow under UV light?

[ivanjesik]

i like if chemists are cooperating also with IT :-)

[Fleshcut]

There are three people from periodic videos I'd actually date.

1. Sam because I'm into asian girls!

2. Debbie because she is a real qtπ!

And 3. Neil because I still want to know what he put into the perfume from the valentines episode...

[MUJAHID56787]

@Fleshcut But not into good looking girls?

[ELFHUNTER50]

@MUJAHID56787 he said from periodic videos

[MUJAHID56787]

@ELFHUNTER50 Nice bong pic!

[ShaolinViolin]

@Fleshcut pathetic desperate loner

[Fleshcut]

@ShaolinViolin I like the part where you called me a pathetic desperate loner for making a random joke on a random youtube video XD

[madjimms]

@Fleshcut Yeah, I think Sam is pretty hot also.

[bamboo4tameshigiri]

Doesn't the "one" at the end signify a keytone?

[tmafkap]

NEIL!

[bamboo4tameshigiri]

Very cool. 

[THECOMMENTER10000]

"A really exciting horrible movie"

I guess professor Poliakoff shares with me the same view that 'horror movies' = 'horrible movies'

[nVidia6000]

Haha, gotta love Neil. 2:48

[schmidtbag]

aw why did you take out neil's response?

[TheCanadain1]

why do al scientists have crazy hair?

[ipilincoln1515]

@TheCanadain1 I think it's because they spend so much time saving and teaching the World that they don't care about their appearance. I wouldn't care about if if I was a scientist lol.

[2nd3rd1st]

@TheCanadain1 Because they don't

[sooguru]

THIRST !

[utubesqueeze]

second.

[Xerriva]

yay