André Pereira

6 Questions 4 Answers 0 Followers

Questions related from André Pereira

Which is the best analytical technique for structure determination?

I need to obtain the molecular structure of a TPU pellet. The TPU is semi-crystalline so I thought in XRD, but I don't know if it would actually work. Can someone tell me if this is a suitable...

04 April 2017 3,959 11 View

Can someone recommend some articles/books on Ultrasound attenuation spectroscopy?

Does anyone knows deeply Ultrasound Attenuation Spectroscopy? I'd like to measure dispersion stability in a high-concentrated slurry (without dilution) and this seems to be one of the only methods...

02 February 2017 7,905 0 View

What can cause offset in FTIR-ATR analysis?

I'm measuring the IR spectra trought FTIR-ATR of the same film multiple times. There is no chemical reactions occurring (as far as I Know). The IR spectras are different from one measurement to...

10 October 2016 1,945 6 View

What can it cause the peaks in the IR spectrum to change?

I'm trying to understand what can it causes the peaks in my sample to change. I'm measuring a mixture containing PUR, some additives, crosslinking agents and silicone. From time to time, the peaks...

10 October 2016 9,540 3 View

Sample Analysis with High-Pressure Clapm offset in FTIR-ATR?

I'm using FTIR-ATR to measure the IR of a polymer film. When I use low pressure, I get one spectra and when I use high-pressure, I get another spectra. The question is that the spectra with the...

10 October 2016 3,669 2 View

Why doesn't my peptide give any absorbance spectra?

I'm trying to measure the absorbance spectra of a peptide (LPFFD). I'm measuring with and without liposomes in a PBS buffer and the absorbance spectra is always similar to the blank well. The...

08 August 2015 8,361 8 View