Achieving molecular distinction in alcohols with femtosecond thermal lens spectroscopy

Rawat, Ashwini Kumar; Chakraborty, Subhajit; Mishra, Amit Kumar; Goswami, Debabrata

doi:10.1016/j.chemphys.2022.111596

Cited by 10 publications

(10 citation statements)

References 70 publications

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“…Further, we added water to set the ratio to 80:20, and then again, the amount of water in the mixture was increased in intermediate steps of 10%. All three sanitizers and also EtOH & IPA exhibit significant absorption at 1560 nm (pump wavelength) (Kumar Rawat et al, 2022). Among these, water has the highest absorption value, and with the increasing quantity of water in the mixtures, the absorption at the pump wavelength enhances.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the small amount of energy delivered by each femtosecond laser pulse to the sample, the high SNR is feasible. In heavily absorbing samples, localized heat accumulation owing to incident femtosecond pulses causes a superheating state, which also alters the sample's nonlinear properties leading to a heat dissipation through both convective and convective heat transfer processes (Mian, McGee & Melikechi, 2002;Falconieri & Salvetti, 1999;Nóvoa-López et al, 2014;Stavrou et al, 2020;Kumar Rawat et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Quality assessment of the commercially available alcohol-based hand sanitizers with femtosecond thermal lens spectroscopy

Chakraborty

Rawat

Mishra

et al. 2023

PeerJ Analytical Chemistry

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Using femtosecond-pulse-induced thermal lens spectroscopy (FTLS), we report a novel method for the quality measurements of alcohol-based hand sanitizers (ABHS). To sustain its effectiveness, the ABHS must contain the recommended concentration of alcohol content. We diluted the hand sanitizer with water to reduce the quantity of alcohol in the mixture and then performed thermal measurements on it. We performed both dual-beam Z-scan and time-resolved TL measurements to identify the alcoholic content in the ABHS. The thermal lens (TL) signal of the solvent is capable of detecting any relative change in the alcohol content in the mixture. Our technique, therefore, emerges as a sensitive tool for quality testing of alcohol-based hand sanitizers.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quality assessment of the commercially available alcohol-based hand sanitizers with femtosecond thermal lens spectroscopy

Chakraborty

Rawat

Mishra

et al. 2023

PeerJ Analytical Chemistry

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“…Recently, our research has demonstrated the impact of molecular size, structure, and molecular interactions on the heat transfer characteristics of both neat solvents and binary mixtures using thermal lens (TL) studies. [10][11][12][13][14] In addition to the factors mentioned earlier, it is important to note that the applied pump laser power exerts a substantial influence on the thermal characteristics of solvents, as previously documented. 13,15,16 However, a comprehensive exploration of the nonlinear optical response and modulated thermal behavior of organic materials (OM) based on their molecular properties and pump laser power notably remains absent in existing literature.…”

Section: Introductionmentioning

confidence: 80%

Power‐dependent study of the photothermal response of several alcoholic media with femtosecond laser‐induced thermal lens

Rawat,

Chakraborty,

Mishra

et al. 2024

Photochem & Photobiology

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We explore the photothermal response of methanol, ethylene glycol, and glycerol using the femtosecond laser‐induced thermal lens spectroscopy (FTLS) technique. A mode mismatched pump–probe spectroscopic technique was utilized to analyze the influence of localized thermal heating on the photothermal response of solvents. The findings revealed a strong dependence on both the input pump power and the molecular characteristics of the solvents. At significantly high pump power, the excess heat load deposited to the solvent is found to be responsible for the induction of the convection currents in the heat transfer mechanisms. Our results highlight that the influence of pump power on photothermal and thermal lens characteristics is intricately linked to the natural drifting and heat transfer mechanisms of solvent molecules. The molecular motion and existing connective processes were correlated with the molecular characteristics of the samples. The present finding reveals that FTLS is a sensitive probe for comprehending the impact of input laser power, molecular structure, and intermolecular H bonding on the photothermal characteristics and thermo‐optical properties of the alcoholic medium.

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“…A significant portion of the existing research on photothermal phenomena has primarily concentrated on thermal conduction. However, more recent investigations led by research groups including Goswami et al [42][43][44][45][46] and Khabibullin and Wang [47,48] have studied the role of thermal convection in the context of thermal lensing. This recent body of work expands upon prior research, including the earlier contributions made by Buffett and Morris [49].…”

Section: Thermal Lensingmentioning

confidence: 99%

Frustrated-Laser-Induced Thermal Starting Plumes in Fresh and Salt Water

Biebighauser,

Dominguez Lopez,

Strand

et al. 2024

Liquids

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The results of a photothermal spectroscopy technique that effectively images convective and conductive heat flow in liquids via a thermal lensing effect are described. Pure water; sodium chloride solutions at salinities of approximately 5, 15, 25, and 35 g/kg; and an artificial seawater of 35 g/kg were studied across a range of temperatures. This system was studied because of the importance of thermal pluming in seawater. ‘Frustrated’ thermal starting plumes were observed near the temperature of maximum density. The physical characteristics of these thermal starting plumes are reported.

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Achieving molecular distinction in alcohols with femtosecond thermal lens spectroscopy

Cited by 10 publications

References 70 publications

Quality assessment of the commercially available alcohol-based hand sanitizers with femtosecond thermal lens spectroscopy

Quality assessment of the commercially available alcohol-based hand sanitizers with femtosecond thermal lens spectroscopy

Power‐dependent study of the photothermal response of several alcoholic media with femtosecond laser‐induced thermal lens

Frustrated-Laser-Induced Thermal Starting Plumes in Fresh and Salt Water

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