scholarly journals Enhancing sensitivity in absorption spectroscopy using a scattering cavity

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jeonghun Oh ◽  
KyeoReh Lee ◽  
YongKeun Park
Keyword(s):  
Analytical Chemistry ◽  
Light Scattering ◽  
Absorption Spectroscopy ◽  
Optical Path ◽  
Spectral Measurements ◽  
Environmental Sciences ◽  
Low Concentrations ◽  
Highly Sensitive ◽  
Path Lengths ◽  
Multiple Light Scattering

AbstractAbsorption spectroscopy is widely used to detect samples with spectral specificity. Here, we propose and demonstrate a method for enhancing the sensitivity of absorption spectroscopy. Exploiting multiple light scattering generated by a boron nitride (h-BN) scattering cavity, the optical path lengths of light inside a diffusive reflective cavity are significantly increased, resulting in more than ten times enhancement of sensitivity in absorption spectroscopy. We demonstrate highly sensitive spectral measurements of low concentrations of malachite green and crystal violet aqueous solutions. Because this method only requires the addition of a scattering cavity to existing absorption spectroscopy, it is expected to enable immediate and widespread applications in various fields, from analytical chemistry to environmental sciences.

Lethality of radioisotopes in early mouse embryos

Development ◽  
1979 ◽  
Vol 52 (1) ◽  
pp. 203-208
Author(s):  
Hilary A. Macqueen
Keyword(s):  
Mouse Embryos ◽  
Highly Sensitive ◽  
Path Lengths ◽  
Early Mouse

The development of pre-implantation mouse embryos was found to be prevented by exposure of the embryos to [35S]methionine, but not to [3H]methionine. Such embryos have also been shown to be highly sensitive to [3H]thymidine. These observations are discussed with reference to the path lengths and energies of electrons emitted from the different radioisotopes.

scholarly journals Biocellulose Masks as Delivery Systems: A Novel Methodological Approach to Assure Quality and Safety

Cosmetics ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 66 ◽  
Author(s):  
Paola Perugini ◽  
Mariella Bleve ◽  
Fabiola Cortinovis ◽  
Antonio Colpani
Keyword(s):  
Light Scattering ◽  
Bacterial Cellulose ◽  
Near Infrared ◽  
Gas Permeability ◽  
Methodological Approach ◽  
Safety Evaluation ◽  
Nir Spectroscopy ◽  
Quality And Safety ◽  
Multiple Light Scattering

Bacterial cellulose (BC) has become of great interest in recent years, as a delivery system in several areas of application, including food, drugs, and cosmetics, thanks to its exclusive advantages, such as high biocompatibility, water holding capacity, and good gas permeability. The novel approach of the authors has led to a protocol for checking the quality and safety of bacterial cellulose matrices in the manufacture of cosmetic masks. Two non-destructive techniques, near-infrared spectroscopy (NIR) and multiple light scattering (MLS), were used to verify different parameters affecting the quality of BC sheets, allowing cellulose masks to be checked over time. NIR spectroscopy allowed for discovering changes in the water content, depending on filling/packaging procedures, like flat-folding. Multiple light scattering was used to ascertain the stability of solutions in contact with masks. From a clinical standpoint, the cutaneous tolerability of biocellulose masks, and their effect on skin parameters, were evaluated through some specific “in vivo” tests. Also, a safety evaluation during application was conducted through different studies: a short-term one after single application, and a long-term one upon continued use.

scholarly journals Dynamical correlations for multiple light scattering in laminar flow

1991 ◽  
Vol 1 (4) ◽  
pp. 471-491 ◽  
Author(s):  
D. Bicout ◽  
E. Akkermans ◽  
R. Maynard
Keyword(s):  
Light Scattering ◽  
Laminar Flow ◽  
Multiple Light Scattering
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