Near-near-infrared thermal lens spectroscopy to assess overtones and combination bands of sulfentrazone pesticide

Ventura, Maurizio; Silva, J.R.; Andrade, Luís Humberto da Cunha; Júnior, Rômulo Penna Scorza; Lima, S.M.

doi:10.1016/j.saa.2017.06.043

Cited by 13 publications

(9 citation statements)

References 20 publications

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“…For TLS characterization, CPNs and 100% PEG-PLGA nanoparticles were assessed at a total solids’ concentration of 3, 30, and 300 μg/mL. The TLS experimental setup was performed with a dual-beam mode-mismatched configuration (Figure S1), as previously described . Briefly, samples were presented using 1 mm quartz cuvettes and placed at the minimum position of the beam waist ( w oe ) of a Ti 3+ :Sapphire laser pumped by a semiconductor laser with λ = 532 nm.…”

Section: Methodsmentioning

confidence: 99%

“…The TLS experimental setup was performed with a dual-beam mode-mismatched configuration (Figure S1), as previously described. 23 Briefly, samples were presented using 1 mm quartz cuvettes and placed at the minimum position of the beam waist (w oe ) of a Ti 3+ :Sapphire laser pumped by a semiconductor laser with λ = 532 nm. The excitation was performed by the Ti 3+ :Sapphire laser tuned at 700 nm and the thermal lens (TL) effect was probed by a HeNe laser operating in 632.8 nm.…”

Section: Optical and Thermal Characterization By Thermal Lens Spectro...mentioning

confidence: 99%

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Thermal Lens Spectrometry Reveals Thermo-Optical Property Tuning of Conjugated Polymer Nanoparticles Prepared by Microfluidics

Abelha

Calvo‐Castro

Lima

et al. 2022

ACS Appl. Polym. Mater.

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Conjugated polymers display useful thermo-optical properties of high relevance to biomedical applications, which are not only dependent on their intrinsic chemical composition but also related to their physical conformation and manufacturing protocol. In this work, we report that the thermo-optical properties of poly [2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) encapsulated within poly(ethylene glycol) methyl ether-block-poly-(lactide-co-glycolide) (PEG-PLGA) can be tuned by production conditions, generating conjugated polymer nanoparticles (CPNs) with customized applications. Thermal lens spectroscopy (TLS) was used to characterize the CPN light-to-heat conversion efficiency as it provides an absolute measurement of heat generation. Although preparation by traditional bulk production led to a high product yield, the CPNs were characterized by similar sizes and thermo-optical properties, irrespective of the molecular weight of amphiphilic PEG−PLGA. In contrast, a microfluidics production method generated CPNs with variable product yields and sizes and thermo-optical properties that are affected by both the molecular weight of PEG−PLGA and the production settings. Given the growing interest in biomedical applications of CPNs, our work provides useful results on microfluidic production of CPNs and of TLS for the screening of candidates with desirable characteristics.

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Section: Methodsmentioning

confidence: 99%

Section: Optical and Thermal Characterization By Thermal Lens Spectro...mentioning

confidence: 99%

Thermal Lens Spectrometry Reveals Thermo-Optical Property Tuning of Conjugated Polymer Nanoparticles Prepared by Microfluidics

Abelha

Calvo‐Castro

Lima

et al. 2022

ACS Appl. Polym. Mater.

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“…This difference depends on the TL formed in the sample and two cylindrical lenses, that introduce an initial astigmatism in the former Gaussian beam. Ventura et al [91] used TLS to detect sulfentrazone pesticide in methanol at a concentration of 5 × 10 -6 mol/L. The same group [92] has shown that using near-near infrared (nnIR, wavelength close to 950 nm) TLS, it is possible to identify biodiesel content in fuel blends.…”

Section: Advances In Tlm and Tlsmentioning

confidence: 99%

Thermal lensing: outside of the lasing medium

Dobek

2022

Appl. Phys. B

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The thermal lens formed in a thermo-optical material as a result of its inhomogeneous heating, is a well-known phenomenon that has found widespread interest in the last decades, especially in the field of laser engineering and photo-thermal spectroscopy. In recent years, growing interest in the application of thermal lensing in different fields of optics and material studies has been observed. This review summarizes the latest efforts made by the scientific community to develop ways of using the phenomenon of thermal lensing. Its applications in spectroscopy, in laser beam formation and in imaging are described. The advantages and disadvantages of the thermal lensing in regard to these areas along with the potential future applications of the phenomenon are discussed.

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“…Os métodos de análise óptica representados pela espectroscopia de absorção no infravermelho têm se tornado populares devido a sua natureza não destrutiva, útil na análise de pesticidas (Armenta Ventura et al, 2018). Vale destacar que do conhecimento dos autores ainda não há dados em livros textos que descrevem a caracterização da molécula do herbicida SFZ espectroscópicas diversas, apesar conhecida relação estrutura herbicidas da classe das feniltriazolinonas com substituintes nas posições 2,4,5 do grupo fenil (Wu et al, 2010) (Ventura et al, 2018). As atribuições das principais bandas de absorção no infravermelho estão descritas na Tabela 4.…”

Section: Caracterização Do Precipitado Através Das Técnicas De Ftir E Análise Térmicaunclassified

DEVELOPMENT OF SULFENTRAZONE EXTRACTION PROCEDURE FROM COMMERCIAL HERBICIDE FORMULATION AND DETERMINATION OF ITS IONIZATION CONSTANT (pKa) BY POTENTIOMETRIC TITRATION

Oliveira¹,

Silva²,

Paula³

et al. 2018

PTQ

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The herbicide sulfentrazone (SFZ) is widely used in soybean and sugarcane crops, although it is classified as very dangerous to the environment. To minimize barriers to the development of research with this herbicide due to the high cost of acquisition of its analytical standard and the availability of few distributors to acquire the standard in the country, a procedure of extraction and purification of SFZ was developed from a commercial herbicide formulation available in Brazil. Using the most suitable experimental conditions established for the extraction procedure, the SFZ content in the resulting solid after extraction and drying was 97.5% (m/m), which value was determined by acid-base potentiometric titrations. To characterize the solid obtained in this procedure, the material was studied by thermal analysis (thermogravimetry and differential scanning calorimetry) and Fourier transform infrared photoacoustic spectroscopy (FTIR-PAS) to confirm the presence of functional groups present in the SFZ molecule. Thermal analysis of the solid resulting from the extraction indicated processes of melting, thermal degradation and volatilization of the SFZ during its heating. By potentiometric titrations of the purified solid dissolved in water/acetonitrile (ACN) binary mixtures, it was possible to determine the ionization constant (pKa) of SFZ in water at 25.0ºC. By this study, extrapolated value of pKa in water is 6.45 obtained from the linear correlation of pKa versus molar ACN fraction plot. The value obtained at 25.0 °C by potentiometry in this study is quite close to the literature value of 6.56 determined at 20 °C by the spectrophotometric technique. However, the pKa value determined by potentiometric titrations of dilute solutions of the SFZ commercial formulations was much higher than that of 6.56, indicating that the degree of ionization of SFZ under herbicide application conditions can be quite distinct in the presence of possible adjuvants present in the commercial formulation of the herbicide.

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Near-near-infrared thermal lens spectroscopy to assess overtones and combination bands of sulfentrazone pesticide

Cited by 13 publications

References 20 publications

Thermal Lens Spectrometry Reveals Thermo-Optical Property Tuning of Conjugated Polymer Nanoparticles Prepared by Microfluidics

Thermal Lens Spectrometry Reveals Thermo-Optical Property Tuning of Conjugated Polymer Nanoparticles Prepared by Microfluidics

Thermal lensing: outside of the lasing medium

DEVELOPMENT OF SULFENTRAZONE EXTRACTION PROCEDURE FROM COMMERCIAL HERBICIDE FORMULATION AND DETERMINATION OF ITS IONIZATION CONSTANT (pKa) BY POTENTIOMETRIC TITRATION

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