Quality control of hydrophobic coatings with an integrated marker element by Laser-Induced Breakdown Spectroscopy (LIBS)

2011 ◽  
Author(s):  
K Bienert ◽  
H Schalk ◽  
A Molkenthin ◽  
G Wilsch ◽  
S Goldschmidt ◽  
...  
Keyword(s):  
Quality Control ◽  
Laser Induced Breakdown Spectroscopy ◽  
Hydrophobic Coatings ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Process quality control of the manufacturing of Chinese Materia Medica by process analysis technology

NIR news ◽  
2019 ◽  
Vol 30 (7-8) ◽  
pp. 14-18
Author(s):  
Lijuan Ma ◽  
Yanjiang Qiao ◽  
Zhisheng Wu
Keyword(s):  
Quality Control ◽  
Near Infrared ◽  
Process Analysis ◽  
Chemical Imaging ◽  
Laser Induced Breakdown Spectroscopy ◽  
Chinese Materia Medica ◽  
Materia Medica ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Non Destructive

Process quality control is essential for the manufacturing of Chinese Materia Medica. Non-destructive monitoring is still a challenge for the quality control of Chinese Materia Medica manufacturing. As the commonly used non-destructive process analysis technology, near infrared spectroscopy, near infrared chemical imaging, and laser-induced breakdown spectroscopy have been applied to the quality control of Chinese Materia Medica manufacturing. The characteristic near infrared bands of 29 natural chemical components have been assigned. Ten spectral pre-processing methods and five variable selection methods have been optimized, respectively. Given the interrelationship among modeling parameters, a system modeling concept was put forward to establish a global model. Accuracy Profile was further proposed as the validation method of models. In addition, the homogeneity of chlorpheniramine maleate tablets from six brands was successfully visualized by near infrared-chemical imaging. As and Hg variation in An-Gong-Niu-Huang Wan have been rapidly monitored by laser-induced breakdown spectroscopy. A systematic modeling method (model establishment, evaluation, and validation) and the non-destructive technology of homogeneity visualization and toxic element detection have been developed for quality control of Chinese Materia Medica manufacturing, which is shown in Figure 1 of the article. These achievements have greatly promoted the research and application of process analysis technology in Chinese Materia Medica manufacturing, laying a solid foundation for the development of intelligent Chinese pharmaceutical industry.

Laser-induced breakdown spectroscopy: an advanced method for analysis of nanocarbon materials chemical composition

2018 ◽  
Vol 33 (2) ◽  
pp. 240-250 ◽  
Author(s):  
V. F. Lebedev ◽  
M. K. Rabchinskii ◽  
M. S. Kozlyakov ◽  
D. N. Stepanov ◽  
A. V. Shvidchenko ◽  
...  
Keyword(s):  
Quality Control ◽  
Chemical Composition ◽  
Laser Induced Breakdown Spectroscopy ◽  
Advanced Method ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Nanocarbon Materials

The LIBS technique is a valuable and effective tool for quality control and the characterization of various nanocarbon structures.

scholarly journals Phosphorous Determination in Biochar-Based Fertilizers by Spark Discharge-Laser-Induced Breakdown Spectroscopy

Chemosensors ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 337
Author(s):  
Samia Rodrigues Dib ◽  
Giorgio Saverio Senesi ◽  
Jose Anchieta Gomes Neto ◽  
Clovis Augusto Ribeiro ◽  
Edilene Cristina Ferreira
Keyword(s):  
Quality Control ◽  
Matrix Effects ◽  
Analytical Techniques ◽  
Direct Analysis ◽  
Spark Discharge ◽  
Laser Induced Breakdown Spectroscopy ◽  
Attractive Alternative ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Matching Procedure

Biochar-based fertilizers are a new attractive alternative to P supplementation for crops, as they can gradually release the nutrient, avoiding losses and improving soil quality. In this regard, the evaluation of the P amount in biochar-based fertilizers is extremely important for their quality control. Analytical techniques that require sample solubilization are not very efficient for this task, as biochar is difficult to solubilize. Laser-induced breakdown spectroscopy (LIBS) is a promising technique to respond to this demand, as it enables a direct analysis of solid samples, avoiding the complicated process of sample solubilization. In this work, a novel method based on spark discharge (SD) coupled to LIBS was evaluated for P determination in biochar-based fertilizers prepared from three different biomasses. To overcome calibration problems in LIBS analysis, a matrix-matching procedure accomplished by the addition of eucalyptus biochar to calibration standards was used in experiments. This procedure minimized matrix effects and allowed us to achieve a satisfactory accuracy even when applied to similar but different matrices. Furthermore, the developed method is simple, fast, direct, does not generate post-analysis residues and appears appropriate for the quality control of sustainable biochar-based fertilizers and other biochar products.

Nanosecond laser-induced breakdown assisted by femtosecond laser pre-ionization in air: the effect on spatial resolution and continuous radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20701
Author(s):  
Bo Li ◽  
Xiaofeng Li ◽  
Zhifeng Zhu ◽  
Qiang Gao
Keyword(s):  
Femtosecond Laser ◽  
Spatial Resolution ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Breakdown Threshold ◽  
Powerful Technique ◽  
Breakdown Spectroscopy ◽  
Continuous Radiation ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for quantitative diagnostics of gases. The spatial resolution of LIBS, however, is limited by the volume of plasma. Here femtosecond-nanosecond dual-pulsed LIBS was demonstrated. Using this method, the breakdown threshold was reduced by 80%, and decay of continuous radiation was shortened. In addition, the volume of the plasma was shrunk by 85% and hence, the spatial resolution of LIBS was significantly improved.

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