Effects of concentration and sample preparation in photoacoustic spectroscopy of powdered samples

King, D. Whitney; Davidson, R. S.; Phillips, Melissa M.

doi:10.1021/ac00250a013

Cited by 26 publications

(2 citation statements)

References 11 publications

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“…The modification of a photoacoustic spectrometer to incorporate wavelength modulation has permitted the direct generation of firstand second-order derivative spectra (76). Two studies concerned with photoacoustic cell design and use have been reported (187,326) while in another study, the effects of concentration and sample preparation for photoacoustic measurements were investigated (258). The optoacoustic detection of polyatomic molecules using the multiphoton absorption effect has been reported (479).…”

Section: Physicsmentioning

confidence: 99%

Ultraviolet and light absorption spectrometry

Hargis¹,

Howell²

1984

Anal. Chem.

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Section: Physicsmentioning

confidence: 99%

Ultraviolet and light absorption spectrometry

Hargis¹,

Howell²

1984

Anal. Chem.

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“…Theoretical works by Monchalin et al (13) and McGovern et al (14) showed that the interstial gas in the voids of the powders can act as amplifier and that, for the same mass, a finer powder is expected to yield higher PA signal than a coarser powder. Although in a number of earlier studies (15)(16)(17)(18)(19)(20)(21) an increase of PA signal with decreasing particle size has been observed, a quantitative check on the equations developed by McGovern et al (14) has not yet been made. It is necessary to understand the particle size effects in PAS if the promise of PAS for IR spectroscopy of powders is to be realized.…”

Section: Introductionmentioning

confidence: 98%

Effect of particle size and modulation frequency on the photoacoustic spectra of silica powders

Pandurangi¹,

Seehra²

1990

Anal. Chem.

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Investigations of the Infrared spectra of crystalline and amorphous silica particles of different sizes (0.05, 5, 10, 15, 30, 45, and 260 pm) In the range of 400-4000 cm"1 using Fourier transform Infrared/photoacoustlc spectroscopy are reported. The change In the Intensity / of the signal with porosity < of powders follows the e/(1 -e) dependence for strong bands and e dependence for weaker bands as predicted by the theory of McGovern et al. For strong bands, / also follows the empirical relation / ~D~n, where D Is the particle diameter In cm and = 0.34-0.42. The anomalous positive frequency dependence of I on the modulation frequency f observed for the stronger bands In the 45-µ and 260-µ particles Is believed to result from saturation. Some observations on the effect of changing the background from (carbon black) powder to pellet are also made.

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Zerstörungsfreie Prüfung von Polymeren mittels photothermischer Meßmethoden. 2. Photoakustische untersuchungen von Polyesterfärbungen in Abhängigkeit von der Farbstoffkonzentration und der Oberflächenrauheit

Eickmeier

Schollmeyer

1993

Angew. Makromol. Chem.

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ZUSAMMENFASSUNG:Im Bereich der textilen Analytik bereitet die Bestimmung der Farbstoffkonzentration dunkler und gesattigter Farbungen groBe Schwierigkeiten. Deshalb wird die Einsatzmoglichkeit der photoakustischen Spektroskopie zur Charakterisierung von Farbungen an Konzentrationseichreihen systematisch untersucht. Die MeDergebnisse wurden mit einer modifizierten Kubelka-Munk-Funktion angepaDt, die iiber einen grofieren Konzentrationsbereich linear verlauft als bei der Reflexionsspektroskopie. Weiterhin wurde der EinfluD der Oberflachenstruktur auf das photoakustische Signal untersucht. SUMMARYThe determination of dyestuff concentration in dark and saturated dyed textiles poses great problems to conventional analytical methods. In this work the use of photoacoustic spectroscopy as analytical tool is systematically investigated by comparing measurements of samples with different dyestuff concentrations. The experimental data can be fitted to a modified Kubelka-Munk function which shows a linear relationship to the dyestuff concentration in a wider range than the reflection spectroscopy. The influence of the surface structure to the photoacoustic signal is investigated.

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Effects of concentration and sample preparation in photoacoustic spectroscopy of powdered samples

Cited by 26 publications

References 11 publications

Ultraviolet and light absorption spectrometry

Ultraviolet and light absorption spectrometry

Effect of particle size and modulation frequency on the photoacoustic spectra of silica powders

Zerstörungsfreie Prüfung von Polymeren mittels photothermischer Meßmethoden. 2. Photoakustische untersuchungen von Polyesterfärbungen in Abhängigkeit von der Farbstoffkonzentration und der Oberflächenrauheit

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