Why Does My DSC Baseline Go Below Zero?

  • Thread starter Thread starter jaejoon89
  • Start date Start date
  • Tags Tags
    Zero
AI Thread Summary
The discussion centers on the issue of a Differential Scanning Calorimeter (DSC) displaying baseline values below zero (negative values). Key points include the possibility of bad calibration affecting the readings, as the absolute number is less significant than the relative change from the initial value set. Another consideration is the potential conversion between polymorphs, which could release energy and result in negative values. Participants also suggest verifying the consistency of results by running the same sample multiple times to see if the negative values persist.
jaejoon89
Messages
187
Reaction score
0
My baseline for the DSC goes past zero (below 0 W/g) why would the instrument be doing this?
 
Chemistry news on Phys.org
This may be obvious, but: Bad calibration?
 
it goes relative to the initial value you put in. the absolute number does not mean much.
 
Perhaps you converted from one polymorph to another and a little energy was released? Have you run the same sample twice and noticed the negative value again?
 

Thread 'Humidity of a saturated NaCl solution with anticaking additive'

I want to test a humidity sensor with one or more saturated salt solutions. The table salt that I have on hand contains one of two anticaking agents, calcium silicate or sodium aluminosilicate. Will the presence of either of these additives (or iodine for that matter) significantly affect the equilibrium humidity? I searched and all the how-to-do-it guides did not address this question. One research paper I found reported that at 1.5% w/w calcium silicate increased the deliquescent point by...
View full post »

Thread 'Why does having 8 valence electrons make an element inert?'

I was introduced to the Octet Rule recently and make me wonder, why does 8 valence electrons or a full p orbital always make an element inert? What is so special with a full p orbital? Like take Calcium for an example, its outer orbital is filled but its only the s orbital thats filled so its still reactive not so much as the Alkaline metals but still pretty reactive. Can someone explain it to me? Thanks!!
View full post »

Thread 'Resists for etching Aluminium with NaOH'

I'm trying to find a cheap DIY method to etch holes of various shapes through 0.3mm Aluminium sheet using 5-10% Sodium Hydroxide. The idea is to apply a resist to the Aluminium then selectively ablate it off using a diode laser cutter and then dissolve away the Aluminium using Sodium Hydroxide. By cheap I mean resists costing say £20 in small quantities. The Internet has suggested various resists to try including... Enamel paint (only survived seconds in the NaOH!) Acrylic paint (only...
View full post »

Similar threads

How Can DSC Graphs Enhance Teaching Laboratory Experiences?
Replies
4
Views
2K
Why can't quantitative values be computed using DSC-MRI?
Replies
2
Views
2K
What does "limit of zero pressure" mean for ideal gas temperature?
Replies
14
Views
3K
Why is current constant through a resistor?
Replies
11
Views
1K
I In which sense(s) do square integrable functions go to zero at infinity?
Replies
2
Views
2K
B Testing spacetime collapse at absolute zero
Replies
1
Views
2K
Insights Why Division by Zero is a Bad Idea
Replies
47
Views
6K
I Discontinuity of Electric field
Replies
7
Views
1K
I Can Quantum Effects Prevent Reaching Absolute Zero?
Replies
3
Views
1K
My 'why' questions -- Wanting to learn Chemistry to figure out my why questions
Replies
11
Views
3K

Hot Threads

Recent Insights

Back
Top