Nonradiative analysis of adulteration in coconut oil by thermal lens technique

Raj, Vimal; Swapna, M. S.; Devi, H. V. Saritha

doi:10.1007/s00340-019-7228-6

Cited by 19 publications

(8 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, it is necessary to determine a dose of the drug that could stop the growth of SAR-CoV-2, which can effectively eradicate the genetic material of the virus [30]. Photothermal techniques such as thermal lens technique could be useful for such applications: drug release in the pharmaceutical, food adulteration analysis, kinetic reactions, sensors, biotechnology and in contaminant trace analysis, among others [10,[31][32][33].…”

Section: X-ray Photoelectron Spectroscopy Analysismentioning

confidence: 99%

Determination of the Dependence of Thermal Diffusivity with Moringa Concentration by Thermal Lens as a Sensitive Experimental Technique

et al. 2020

View full text Add to dashboard Cite

The use of photothermal techniques has become of special importance due to their versatile application in the thermal characterization of materials. Therefore, the thermal lens technique in the mismatched dual-beam mode is an alternative, sensitive and non-evasive tool that was used in this research to determine the thermal diffusivity of Moringa oleifera. The dual arrangement of the thermal lens technique is based on the use of an Ar + Xe excitation laser (422 nm) and a He-Ne laser (632 nm) test laser. Moringa solutions were prepared by green synthesis with different concentrations ranging from 1.56 mg•mL −1 , 3.12 mg•mL −1 , 6.25 mg•mL −1 to 12.50 mg•mL −1. Different optical techniques (UV-vis, FTIR, XPS and EDS) were used to characterize the Moringa leaf powders. Results showed that the increase of thermal diffusivity could be related to the presence of functional groups and metallic elements in Moringa elemental composition. In this work, it was found that the thermal diffusivity of Moringa increases with increasing concentration. This study will be useful for application in heat transport and drug release.

show abstract

Section: X-ray Photoelectron Spectroscopy Analysismentioning

confidence: 99%

Determination of the Dependence of Thermal Diffusivity with Moringa Concentration by Thermal Lens as a Sensitive Experimental Technique

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Because of this, there is a change in the medium's refractive index, which causes an effect similar to a lens that is either diverging or converging, ultimately leading to the generation of the TL signal. [23,28] The signal contains vital information about the thermo-optical properties of the sample as well as the molecule and particle dynamics that are at play in the medium. [13,20,21] In the present work, the dual-beam thermal lens technique has been employed to delineate how the thermal behavior of CNT nanofluids can be tuned without changing their concentration.…”

Section: Doi: 101002/pssa202200797mentioning

confidence: 99%

Solid‐Volume‐Fraction Retained Tailoring of Thermal Diffusivity of Multiwalled Carbon Nanotube Nanofluid: A Photothermal Investigation

Swapna

Korte

Sankararaman

2023

Physica Status Solidi (a)

View full text Add to dashboard Cite

The role played by nanofluids in industrial growth is highly significant, as their enhanced thermophysical property helped in energy-efficient thermal system design and the development of electronic chips with a greater number of components. [1,2] Fluids with suspended nanoparticles in them are referred to as nanofluids and are regarded as the heat transfer fluids of the next generation. [3] The nanofluid technology relies on the solid phases that can be found in the nanoscale dimension as its fundamental building blocks. Research in the field of nanofluids was initially sparked by the capability to produce nanoparticles of varying sizes and shapes that possessed a high surfaceto-volume ratio. Because of the increased convection between the nanoparticles in the liquid medium, issues of clogging and sedimentation, which are common in conventional microparticle suspensions, are avoided. [4] This, in turn, results in improved thermal conductivity, thermal diffusivity, and a high heat transfer coefficient. Nanofluids are a novel class of materials with exceptional stability and greater heat exchangeability, making them suitable for creating low-cost, lightweight, highly efficient heat transfer and thermal management systems that set them apart from other classes of materials. [4,5] The concentration of nanoparticles, temperature, pH, surfactants and the base fluid's viscosity is reported to significantly influence nanofluids' thermal diffusivity. [6][7][8] Nanoparticles of carbon, metals, oxides, ceramics, alumina, and polymers are commonly dispersed in an appropriate base fluid to create the nanofluid. [6,9,10] Among the nanoparticles used in thermal energy management, carbon and its allotropic forms stand out as being particularly noteworthy due to the ease with which they can be obtained, the flexibility with which they can be synthesized, their capacity to both trap and dissipate heat, and their ability to do so. [1,[11][12][13][14][15] Carbon nanotubes, also known as CNTs, are a carbon allotrope type with exceptional thermal, electrical, corrosion-resistant, and mechanical capabilities. [16][17][18][19] These features enable various forms of CNTs (single-walled (SW) and multiwalled (MW) CNTs) to be utilized in producing heat transfer fluids. Creating a stable CNT nanofluid suspension is one of the primary challenges that must be overcome when preparing nanofluid. The powerful van der Waals interaction and cohesive forces between the nanoparticles are to blame for the decrease in stability. The literature shows that a substantial amount of work has been done on CNT nanofluids.

show abstract

“…Even small concentrations of some substances may be the sign of adulteration of food (intentional contamination). Raj et al [93] used TLS to detect liquid paraffin oil in coconut oil. Almeida et al [94] have proposed TLS to be used in the dosimetry field.…”

Section: Advances In Tlm and Tlsmentioning

confidence: 99%

Thermal lensing: outside of the lasing medium

Dobek

2022

Appl. Phys. B

View full text Add to dashboard Cite

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.

show abstract

Nonradiative analysis of adulteration in coconut oil by thermal lens technique

Cited by 19 publications

References 36 publications

Determination of the Dependence of Thermal Diffusivity with Moringa Concentration by Thermal Lens as a Sensitive Experimental Technique

Determination of the Dependence of Thermal Diffusivity with Moringa Concentration by Thermal Lens as a Sensitive Experimental Technique

Solid‐Volume‐Fraction Retained Tailoring of Thermal Diffusivity of Multiwalled Carbon Nanotube Nanofluid: A Photothermal Investigation

Thermal lensing: outside of the lasing medium

Contact Info

Product

Resources

About