Quantum dot synthesis

[ashishnirban]

sir can you send me the exact precursors you used and experimental conditions maintained during synthesis of these QD ...my mail id is ashishnirban@gmail.com...i need them for my project

[nellux]

That clock is a lab classic.

[atmatheprophet]

Impressive, and now I want to go take Rainbow Shots.

[EPIGNTCS]

The problem is, these HORDES of Asians that MIT let let our school every year, which is fine, but if you're going to come to MIT, then use AMERICAN MANNERS!

[evansmithscience]

Great, but how can we make them at home?!?!

[myangelmy]

so what's the point of removing the reaction solution at regular interval? to study the size distribution?

but in the end you will use the final product which is a dark red solution right?

[Guds777]

woalla, a colde fusion. hehehehehe.

[lorenzom21]

Epic

[AMonteverdi]

what happens if u mix them all together...?

[Arissef]

Looks like every video (whatever it's about) has to use this music.

[vladislaowilly]

hey i love this videos, were i want to prepare some quantum dots like yours, were can i find the procedure

[zweisteinJ]

music fail

[germans1]

Watch out for a company on the London aim market going places with this technology. ticker symbol nano.

[apparent123]

is that edible?

[partition00]

sure it is

[AliciaNoir]

i see what you mean by overly dramatic soundtrack haha, although it does build with the experiment. i loved watching the quantum dots at sussex uni, i was amazed by them. nice video.

[kingoliver2111]

wow good video

[ytmachx]

Excellent video and super work! I wish I could have been there when you did it!

[goodnec]

requiem for a synthesis

[guachipiruli]

the purple nitrile gloves are very fancy and fashionable but they don't protect against possible spills of QD in the sizes you are synthesizing: not smart. They will never be used in vivo in humans.

[Okibum04]

They can be used in vivo after ligand exchange, maybe CdSe won't be used but InP could be.

[hinginator]

Absolutely agree. Cd is exceptionally toxic and the nanometric scale indicates they will easily permeate cellular membranes

[Spastb00n]

I guess you are refering to the microscopic holes in nitrile gloves, that are in fact large enough to let nano-particles pass through?

If that is the case, I wouldn't be so sure, that they "don't protect". There still needs to be some sort of cause as to why they should enter these holes and your body.

Unless it is a known problem, in which case I happily stand corrected.

[aliyaapple]

not TOPO or TOP, is paraffin

[rimpick]

Song-Requiem for a dream!

sound even better with 2pac on it,-mix-.

[hydrogen1219]

I think they used a coordinating solvent that consists of TOP and TOPO. This solvent is very important to synthesize nanopartices because it can stablize the result colloidal dispersion as well as electronically passivate the semiconductor surface.

[lexichronicle]

nice!

[darkcurrent]

wow, you guys aren't scared of getting cataract by turning that UV lamp upside down?

[apparent123]

The overdramatic music was good.

[muschitrichter]

TOPO

[muschitrichter]

I think TOPO

[mi3a]

Nice vid, which solvent exactly was used ?

[Alterstateresearcher]

I am excited about its application as a tool in biomedical science. I checkout invitrogen and they got a Qdot/antibody conjugation kit for immunofluoresence imaging. I want to try it out so badly, but my mentor chooses the standard organic dye.

[quantumdude]

Oh and by the way, there is no such qdots smaller in diameter than the bohr radius of an electron. The bohr radius(a0) is defined as the smaller radius accesible to an electron in the ground state of the hydrogen atom. You sure you guys are from M.I.T ?

[wli224]

That's correct quantumdude. But as you probably already know, what is meant in the description is that the QDs are smaller than the Bohr radius of the exciton, or the electron-hole pair generated upon photoexcitation. Colloidal QDs have a size distribution of a few %, and the benefits are solution processability which are useful for a number of applications such as in biology.

[quantumdude]

Thanks for clarifying that up, it is indeed smaller than the radius of the exciton. While biological probing applications of the dots are indeed a issue of interest, there is still the problem of blinking and photobleaching that needs to be resolved.

[quantumdude]

What was the standard deviation on the particle size distribution ? Generating colloidal qdots is not the way to go, molecular beam epitaxi on the other hand offers greater control and regularity on the size of the dots.

[faisalhalim]

Yeah, but I figure that colloidal QDs will be easier to manufacture, and far cheaper; or has epitaxy technology gotten better than that (I am not an epitaxy person, so please enlighten me)?

[illegal0immigrant]

what music is this? i love this music and i've been trying to figure out what it is.

[wli224]

The soundtrack is from Lord of the Rings :)

[quantumdude]

Huh ? I thought it was from Requiem for a dream !

[wli224]

The original track is called Lux Aeterna from the Requiem soundtrack, but the version in the video was the re-orchestrated version used in the trailer of LOTR:Two Towers

[salvinorinman]

The Paul Oakenfold remix is really sweet, makes me feel like some kind of secret operative or something.

[wellawarenet1]

That is the material they are using to produce the spray on solar pannels, correct?

[nwanzer]

I believe that is the plan, though I haven't heard of any success. Most likely the material they will use will be indium gallium nitride as it is effcient at q-dot sizes. Normally that material would cause a lot of defects when use for a conventional photo cells but the small size of q-dots eliminates that problem.

[gosmellafish]

Um, yes. That's right. Only, how big is the photon compared to the quantum dot?

And how efficient is the fluorescence?

[rdhawke]

And...this is useful for what...total annihilation or humanity's salvation?????????

[gandovli]

The cutting edge application of quantum dots is its researched as potential artificial fluorophore for intra-operative detection of tumors using fluorescence spectroscopy.

[faisalhalim]

It's up to the user to decide whether he/she wants to use the technology for good, or for harm. QDs can be used for tumor detection, as mentioned by gandovli, or (using larger QDs) for detecting incoming missiles (the US Army is interested in this), but they can also be used as part of the sensors on homing missiles, if someone chooses. I am not sure if a technology, in itself, can be judged helpful, or hurtful/harmful. To me, that just does not make sense.

[DaBlackWizzard]

NERD!!!!!!!

[mallamoozoo]

So its basically just flourescence? What's the big deal?

[LS2JuNkIe]

nanocrystal size being less than the Bohr radius of the electron.

[LMB222]

Cancer research is the big deal. The fluorescence is just to woo lamers; a good experiment is a colourful experiment ;)

[faisalhalim]

There are more applications, than that. There is also research on detectors, emitters, and limiters of light, among a whole range of other applications for QDs. For example, mechanical engineers use QDs for strengthening building materials.

[GhostFS]

Ya. And Because of that Qdot are studied also as chemical marker in medicine.

usefull against Cancer

[madamerotten]

Are any of these chemicals edible?

[LMB222]

madamerotten: they are usually toxic, but can be covered with a non-toxic coat. I'm not sure how safe it is at the moment, but research is going that way. An experiment with mice done some time ago killed them.

[gosmellafish]

What is the quantum yield?

[asifexisted]

it is the percentage of photon absorbtions resulting in a photon emission.

[8monoxxx]

I THINK its from Lord of the rings , but i doubtof it.

[wli224]

Yea, it's from lord of the rings :)

[conocain]

if you believe to tunatic its:

Lux Aeterna (Full Orchestral Remix)

from Clint Mansell

great work you've done. are there any more videos like this?

[conocain]

whats the name of the song?

[gosmellafish]

You're still using coordinating solvents?

[hoppin89108]

can someone explain to me what he is doing?

[J2897]

He's making magic potions. If you mix the green and the red, you get a fire breathing dragon which will attack anything but you.

[fightingsquirls]

He is creating various sizes of Quantum dots. The larger the quantum dot the larger the bandgap. When the quantum dot is exposed to UV light it accepts the photon and sends an electron from the valence band into the conduction band. The electron wants to go back to its normal state so it travels back to the valence band. During this process there is electron radiation which emits the light you see in the vials. Depending on the size of the bandgap the color will vary.