The sample size will certainly influence the test result.
Larger samples will increase sensitivity but larger sample will decrease resolution.
An example of influence sample size on indium Melt (http://www4.ncsu.edu/~lalucia/courses/WPS-595B-BIOMATERIALS-CHARACTERIZATION/DSC.pdf)
Weight (mg) Onset C Peak C Width
0.49 156.41 156.56 0.17
1.21 156.45 156.76 0.29
5.70 1 56.61 157.17 0.55
Please provide more examples on influence sample size on the test result especially for glass. We would like know how significant the influence of sample size for glass.
We have glass fragment as received material.
If we cut the glass fragment into small pieces if how big the difference will be (if there is any)I n testing result to test a single piece of fragment or to test two or three smaller fragments in the same mass with a single piece of fragment
We need find a method to achieve same sample size for each test. If there is a manual or instruction on the method of sample preparation?
sample size definitely affect the thermal parameters of the sample being sudied through DSC. excess quantity of sample will take long in completing the thermal event and thus would naturally be having higher than usual FWHM. if sample have pronounced thermal event then one can take small quanity of sample otherwise one need to take appreciable amount of sample in order to distinguish thermal event from noise. regarding using same sample size better way is to use fine grain powder of the sample.
Dear Baoliang Zang: regarding the fact you are doing experiments with glass, you should be very aware such glass does not have any fluoride, since the experiments you are running can produce hydrogen fluoride, which can produce serious damage to your equipment, regardless the healt problems.
Dear Victor Ponce
Thank you for your comment.
Would you please tell me why the DSC running can produce hydrogen fluoride, where is the hydrogen come from? Thanks
Dear Victor Ponce
Our glass do contain about 2% of fluoride
The sample size for DSC test is 10 - 20 mg
Will it be big enough to produce some hydrogen fluoride (in quantity )to damage the
instrument?
Thank you
Dear Victor Ponce
I have found a few papers that use Differential Scanning Calorimeter (DSC) test on fluoridate glass for example
http://www.scielo.br/scielo.php?pid=S0100-40421998000300024&script=sci_arttext
ARTIGO
STABILIZATION OF FLUOROINDATE GLASSES BY MAGNESIUM FLUORIDE AND OTHER HEAVY METAL FLUORIDES
________________________________________
B. J. Costa*
IFSC - USP - CP 369 - 13560-250 - São Carlos - SP
A. Soufiane
Full Spectrum, Inc. - 2515 Elwood Drive - Unit 108 - Ames - Iowa - 50010 - USA
Y. Messaddeq
IQ - UNESP - CP 355 - 14800-970 - Araraquara - SP
Recebido em 2/12/96; aceito em 17/4/97
* Permanent address: Tecpar - CP 357 - 80001-970 - Curitiba - PR
________________________________________
INDIUM FLUORIDE-BASED GLASSES CONSTITUTE A NEW GENERATION OF MATERIALS FOR APPLICATIONS IN THE MID-INFRARED SPECTRAL RANGE. Their extended transparency in the IR makes them attractive for use as optical fibers for CO laser power delivery and optical amplification. This paper firstly describes the spectacular stabilizing effect of MgF2 on the binary system InF3-BaF2. The investigation of the InF3-BaF2-MgF2 system led to samples up to 5mm in thickness. Further optimization of this system was achieved by incorporation of limited amounts of other fluorides and resulted in increased resistence to devitrification. The second approach of this work was concerned to the investigation of the pseudo-ternary system InF3-GdF3-GaF3 at constant concentrations of ZnF2-SrF2-BaF2-NaF. Several compositions were studied in this system. The samples presented a better thermal stability when compared to other families of fluoride glasses. Therefore, these glasses seem to be very promising for the fabrication of special optical fibers. Thermal data are reported.
Keywords: glass; fluoroindate; stabilization.
And http://etheses.bham.ac.uk/1680/1/Kartelia11MRes.pdf
Thermal characterization of magnesium containing ionomer glasses Thesis submitted for the degree of MRes Biomaterials, School of Engineering, University of Birmingham.
I am confusing now how big the risk will be to produce hydrogen fluoride to test glass contain floured ?
I guess we all watched at least one of the ALIENS franchise films. HF is like the so-corrosive blood from aliens, since there is not a metal which can stop it. Actually, HF is stored only in plastic bottles. When someone has a HF drop at the skin -hopefully by accident- the HF will continue it's way throught the skin, even bone is dissolved (remember it's mainly calcium).
I suggest you to examinate very carefully your aluminium pans after heating, tear down and look for any sign of corrosion (safety gloves and glasses recommended), microscope is recommended. If any corrosion is found, then your equipment is in danger.
It's upon the fluoride bonding and the heating program your experiments are releasing HF or not, since the danger -for equipment and healt- is quite big, you should be very carefull before resume.
http://en.wikipedia.org/wiki/Hydrogen_fluoride
http://en.wikipedia.org/wiki/Hydrofluoric_acid
- Badges
- Science topic
- Similar topics
- Engineering
- Thermal Engineering
- Thermofluid
- Heat Transfer