Influence of binders on infrared laser ablation of powdered tungsten carbide pressed pellets in comparison with sintered tungsten carbide hardmetals studied by inductively coupled plasma atomic emission spectrometry

Holá, Markéta; Otruba, Vı́tĕzslav; Kanický, Viktor

doi:10.1016/j.sab.2006.03.007

Cited by 18 publications

(7 citation statements)

References 29 publications

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“…The MgII/MgI ratio was found to be inversely related to tissue ablation rate ( Figure 4). Since the ablation rate could be inversely related to tissue cohesiveness, 16 it was confirmed that the harder the sample, the higher the ionization effectiveness.…”

Section: Application Of Libs Analysis To Estimate the Cohesion Of Whementioning

confidence: 86%

“…Pulsed laser ablation using an excimer laser (argon fluoride -ArF, 193 nm, 15 ns) was demonstrated as a potential technique to reveal wheat tissue properties, 14,15 by comparing tissue ablation rate to the tissue cohesion. 16 However, ablation rate (material loss/pulse) was determined using microscopic observations which are time consuming. 14 Taking advantage of the differences in structure and composition among the outer tissues, laser-induced breakdown spectroscopy (LIBS) and chemometrics were successfully applied to differentiate the tissues.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of Wheat Grain Tissue Cohesion via Laser Induced Breakdown Spectroscopy

Martelli

Brygo²,

Delaporte³

et al. 2011

Food Biophysics

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During the wheat milling process, the bran fractionation is related to its mechanical properties, which are measured using tensile tests on hand-isolated tissues. However, the dissection of wheat tissues implies a soaking stage in water that can modify tissue properties. New methodologies are required to evaluate wheat tissue properties directly on native grains. The aim of this work was to estimate wheat grain tissue cohesion by the ionization effectiveness via laser-induced breakdown spectroscopy (LIBS) technique. Isolated bran tissues and wheat grains were submitted to LIBS analysis using a pulsed argon fluoride (193 nm, 15 ns, 1 Hz, 2 J cm −2 ) excimer laser and a compact optic fiber spectrometer (HR2000). The first approach was to correlate the ratios of ionic to atomic emission lines (MgII/MgI and CaII/CaI) of isolated tissues to their mechanical measurements. The energy needed to rupture the tissue was correlated to MgII/MgI (R 2 =0.72). Secondly, native grains were irradiated and chemometrics was applied to discriminate tissue spectra. The aleurone layer isolated after the soaking step presented a higher MgII/MgI than the aleurone layer from native grains, indicating a possible water effect on the tissue cohesion. In conclusion, the LIBS technique may be a potential method for rapid structural analysis of vegetal material allowing wheat population screening of both compositional and mechanical properties.

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Section: Application Of Libs Analysis To Estimate the Cohesion Of Whementioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Estimation of Wheat Grain Tissue Cohesion via Laser Induced Breakdown Spectroscopy

Martelli

Brygo²,

Delaporte³

et al. 2011

Food Biophysics

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“…The difficulties encountered are quite similar to soil analysis where a typical 20% precision and accuracy are admitted. 20 Many strategies have been developed to improve homogeneity of the sample when the self-bonding properties of the sample are not appropriate: use of various types of binders, [21][22][23][24][25][26] sol-gel synthesis 25 or glue addition, 26 in fact there is still no universal preparation for laser ablation of powdered materials.…”

Section: Introductionmentioning

confidence: 99%

Comparison of LA-ICP-MS and LA-ICP-OES for the analysis of some elements in fly ashes

Staňková

Gilon

Dutruch³

et al. 2011

J. Anal. At. Spectrom.

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International audienceIn this work quantitative analysis of minor and trace elements in fly ash by nanosecond laser ablation (LA)-ICP-MS and LA-ICP-OES was investigated in terms of detection limits and accuracy. Different binders and modifiers (silver or chromophores) were added to the fly ash powder to prepare mechanically stable pellets and improve sensitivity (signal to concentration ratio). Maleic acid was found to provide a higher degree of homogeneity between sensitivities across the different fly ashes tested. Ashes were from different origins: domestic waste incinerator or ashes from various coal-fired power plants. A calibration procedure using reference materials as standards was employed, the LAI-CP-MS analysis gave an acceptable accuracy (estimated from NIST 1633), better results were obtained using fused bead preparation. The use of the LA-ICP-OES system gave, when possible (higher concentrations), good results in terms of detection limits (1 to 11 mu g g(-1)) and accuracy

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“…In the second technique, the sample is pressed to prepare a pellet with a chemical binder (e.g., Heuzen and Morsink, 1991;Jarvis and Williams, 1993;Perkins et al, 1993;Craig et al, 2000;Tibi and Heumann, 2003;Williams and Jarvis, 1993), which causes a change in concentration (e.g., Gray, 1985), or without any binder (e.g., Becker et al, 2000;Lee et al, 2003;Holá et al, 2006;Ito et al, 2009). Standard addition and/or isotope dilution methods also are used for the pressed powder pellet to convert signal intensity to chemical concentration, causing the similar limitation as is found in fused samples (e.g., Becker et al, 2000;Lee et al, 2003;Holá et al, 2006). Use of an external standard is a good strategy (e.g., Craig et al, 2000); however, appropriate choice of the standard material is important.…”

Section: Introductionmentioning

confidence: 99%

The matrix effect on 238U and 232Th measurements using pressed powder pellets by LA-ICP-MS

Ito

Hasebe

et al. 2011

Geochem. J.

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Influence of binders on infrared laser ablation of powdered tungsten carbide pressed pellets in comparison with sintered tungsten carbide hardmetals studied by inductively coupled plasma atomic emission spectrometry

Cited by 18 publications

References 29 publications

Estimation of Wheat Grain Tissue Cohesion via Laser Induced Breakdown Spectroscopy

Estimation of Wheat Grain Tissue Cohesion via Laser Induced Breakdown Spectroscopy

Comparison of LA-ICP-MS and LA-ICP-OES for the analysis of some elements in fly ashes

The matrix effect on 238U and 232Th measurements using pressed powder pellets by LA-ICP-MS

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