Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: Caffeine Crystals from Coffee (Video) Feedback?
LifeisElemental
Harmless
*




Posts: 39
Registered: 18-7-2014
Location: United States
Member Is Offline


[*] posted on 25-1-2015 at 11:58
Caffeine Crystals from Coffee (Video) Feedback?


Hey guys - wanted to share my latest video. I have changed as much to the format as I could from the feedback on the last video I had posted here.

I would really appreciate additional critique. I've tried my best to make the video more engaging and professional than before.

Thanks!

https://www.youtube.com/watch?v=fkhO3461T0E
View user's profile View All Posts By User
Bot0nist
International Hazard
*****




Posts: 1559
Registered: 15-2-2011
Location: Right behind you.
Member Is Offline

Mood: Streching my cotyledons.

[*] posted on 25-1-2015 at 13:30


Good video and an easy to follow workup. Nice presentation and lab.



U.T.F.S.E. and learn the joys of autodidacticism!


Don't judge each day only by the harvest you reap, but also by the seeds you sow.
View user's profile View All Posts By User
morganbw
International Hazard
*****




Posts: 561
Registered: 23-11-2014
Member Is Offline

Mood: No Mood

[*] posted on 27-1-2015 at 16:56


Nice job
View user's profile View All Posts By User
TheChemiKid
National Hazard
****




Posts: 493
Registered: 5-8-2013
Location: ̿̿ ̿̿ ̿'̿'̵͇̿̿з=༼ ▀̿̿Ĺ̯̿̿▀̿ ̿ ༽
Member Is Offline

Mood: No Mood

[*] posted on 27-1-2015 at 17:04


In the description, you should try to include the quantities of what you used.



When the police come


\( * O * )/ ̿̿ ̿̿ ̿'̿'̵͇̿̿з=༼ ▀̿̿Ĺ̯̿̿▀̿ ̿ ༽
View user's profile View All Posts By User
j_sum1
Administrator
********




Posts: 5460
Registered: 4-10-2014
Location: Oz
Member Is Offline

Mood: Taking opportunities to breathe.

[*] posted on 27-1-2015 at 19:08


Loved it.
The format of demo first, explanation second worked well. Music, tone, pacing, camera work and editing all first rate.
My only criticism is the bit on sublimation. I could not really see how the device you used worked -- what route the gas flow took and how the crystals ended up in the test tube. Nothing I couldn't look up, but if you are introducing apparatus then that piece needed some more detail.

I gave it to some of my students today. (First chem lesson of the year.) I can envisage one or two of them using this method as the basis for an extended investigation in a few months time. There was certainly some interest.
View user's profile View All Posts By User
Zombie
Forum Hillbilly
*****




Posts: 1700
Registered: 13-1-2015
Location: Florida PanHandle
Member Is Offline

Mood: I just don't know...

[*] posted on 27-1-2015 at 19:49


We thoroughly enjoyed your work.
I do agree w/ Sum1's comment on the apparatus. I felt like I missed part of the movie. Just when the bad guy gets clipped...

Other than that one tiny detail it made me smile. Nice job!:D

Oh.... a ps. One of those Bubble Pipes would really give an air of old world scholar. Street cred as it were.

3904400637_3975cac2b2.jpg - 75kB




They tried to have me "put to sleep" so I came back to return the favor.
Zom.
View user's profile View All Posts By User
Darkstar
National Hazard
****




Posts: 279
Registered: 23-11-2014
Member Is Offline

Mood: Sleepy

[*] posted on 28-1-2015 at 01:22


Quote: Originally posted by j_sum1  

My only criticism is the bit on sublimation. I could not really see how the device you used worked -- what route the gas flow took and how the crystals ended up in the test tube.


It looks like a makeshift cold finger. Also, the crystals end up on the outside of the test tube, not on the inside. The solid caffeine crystals are heated under a vacuum causing them to sublime into their gas phase, which then re-condenses on the cool surface of the test tube. (I'm assuming the tube was filled with something cold)

Excellent video, by the way. :D
View user's profile View All Posts By User
j_sum1
Administrator
********




Posts: 5460
Registered: 4-10-2014
Location: Oz
Member Is Offline

Mood: Taking opportunities to breathe.

[*] posted on 28-1-2015 at 01:34


Yeah that was my first thought too and that makes sense. But if i remember correctly the next shot looked like the crystals were inside.

It just wasn't clear to me.
View user's profile View All Posts By User
Zombie
Forum Hillbilly
*****




Posts: 1700
Registered: 13-1-2015
Location: Florida PanHandle
Member Is Offline

Mood: I just don't know...

[*] posted on 28-1-2015 at 17:58


You can form the crystals either way. Invert the test tube, and chill the outside or stand it normally, and chill the inside. It just depends on the equipment you have

From the glimpse we had it appeared Lifeis used a silicone couple-r, suspending the test tube inside the heating container. The coolant was inside the test tube, and the crystals were collected on the outside.





They tried to have me "put to sleep" so I came back to return the favor.
Zom.
View user's profile View All Posts By User
kecskesajt
National Hazard
****




Posts: 299
Registered: 7-12-2014
Location: Hungary
Member Is Offline

Mood: No Mood

[*] posted on 7-2-2015 at 01:56


Best video ever :) Nice appatus,great music, informative,high purity(maybe foodgrade).
10/10
Its like...Skyrim with guns.
View user's profile View All Posts By User

  Go To Top