Jan David

11 Questions 28 Answers 0 Followers

Questions related from Jan David

May cold crystallization occur AFTER melting poit by PE and PP?

Hi all, please, its is also possible, that cold crystallization occurs AFTER melting point? E.g. by PE at about 220 °C (melting at 112 °C) and by PP at about 235 °C (melting at 150 °C) .

05 May 2019 1,363 7 View

Which Young's Modulus is possible for Jello (German version: Göttersspeisse) ?

Hi to all polymer physicists, is it possible, that E modulus of Jello (or it's German version "Göttersspeisse" - the protein content may differ) is, according to the concentrations of the Jello...

01 January 2019 3,216 4 View

Are there any companies or labs which offer commercial CryoMilling?

Hi all, do you know about any commercial service which offers CryoMilling? We have a few samples of plastics (including e.g. PET) and soils, which we need to cryomill, but since we do not need...

09 September 2017 6,623 2 View

Signal-to-noise ratio in mass spectrometry (TGA-MS)

Hi all, is there any proper way, how to determine a signal-to-noise ratio in mass spectrometry, in particular in TGA-MS system? And do I really need it when I already have my LOD and LOQ...

04 April 2017 5,375 3 View

Is a chloride ion-selective electrode with reference argentochloride electrode suitable for an Ag(s)/AgCl(s)/KCl (aq.,sat)/Fe3+,Fe2+/(aq.)/Pt system?

Hi all, May I use the chloride ion-selective electrode with reference argentochloride electrode and Ag2S membrane suitable for an Ag(s)/AgCl(s)/KCl (aq.,sat)/Fe3+,Fe2+/(aq.)/Pt (s) system in order...

04 April 2017 9,072 7 View

Possible TGA pyrolysis products of potassium ferrocyanide K4[Fe(CN)6] ?

Hi all,could anyone give me a hint, in which pyrolysis products can potassium ferrocyanide K4[Fe(CN)6] (Yellow Prussiate of Potash) degrade? I would pyrolyze it to about 1100 °C in Ar flow a TGA...

02 February 2017 8,750 3 View

Determination of sulfides (Na2S, Na2Sx, H2S) from aq. solutions ?

Are there any possibilities to determine sulfides (preferrably in the form of Na2S, Na2Sx, or H2S) from an aqueous solution, where MilliQ-water and 25 mg/L or 125 mg/L of trisodium citrate will be...

02 February 2017 6,999 1 View

Are there any microwave digestion procedures for sulfides (e.g. Na2S, Ag2S) for further determination of S via ICP-OES ?

Hi, are there any microwave digestion/oxidation procedures for sulfides (e.g. Na2S, Na2Sx, Ag2S) for further determination of S via ICP-OES ?I need to do the digestion, since the sulfur in...

01 January 2017 3,305 3 View

When performing pyrolysis of soil and of PET via TGA-MS and becoming a signal of mass 57, may I attribute it to [CH3CH2CH2CH2]+ and/or [CH3CH2CO]+ ?

When performing pyrolysis of soil and pyrolysis of poly(ethylene terephtalate) via TGA-MS and becoming a signal of mass 57, may I attribute it to [CH3CH2CH2CH2]+ and/or [CH3CH2CO]+ as a products...

06 June 2016 6,297 2 View

Standard of PET?

Is there any company or institution, which sells standards of a clean PET (without plasticizers, reinforcements, stabilizers, pigments)? Ideally in a pulverized form (particles in µm range, not...

10 October 2015 5,058 7 View

How do you prepare sodium polysulfide Na2Sx in aqueous solution?

How can I easily prepare the sodium polysulfide Na2Sx, preferrably in aqueous solution? Does it the simple mixing of Na2S with sulfur powder in aqueous solution?I was searching for information in...

11 November 2014 9,330 34 View