Multi-wavelength thermal-lens spectrometry for high-accuracy measurements of absorptivities and quantum yields of photodegradation of a hemoprotein–lipid complex

Tishchenko, Kseniya; Muratova, Marina; Volkov, Dmitry S.; Филичкина, В. А.; Nedosekin, Dmitry A.; Zharov, Vladimir P.; Проскурнин, М. А.

doi:10.1016/j.arabjc.2016.01.009

Cited by 15 publications

(9 citation statements)

References 81 publications

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“…To assess the size and thermal parameters, steady-state mode-mismatched back-synchronization photothermal lens spectrometry at 514.5 nm (Supporting Information, Section S4) was applied. In a back-synchronized modality, a new heating–cooling measurement cycle starts after reliably reaching steady-state conditions. , These steady states correspond to the following equilibria: in the heating half-cycle, to the thermal equilibrium in the sample upon the formation of a stationary thermal lens; in the cooling half-cycle, to the complete dissipation of the thermal field of the thermal lens at the end of heating. The durations of the heating (blooming) and cooling (dissipation) half-cycles do not coincide and are governed by thermal properties and concentration of the sample.…”

Section: Results and Discussionmentioning

confidence: 99%

Photothermal and Heat-Transfer Properties of Aqueous Detonation Nanodiamonds by Photothermal Microscopy and Transient Spectroscopy

et al. 2021

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Characteristic size and heat-transfer parameters of aqueous detonation-nanodiamond dispersions of various brands as carbon-based nanomaterials for nanofluidic tasks were assessed by confocal photothermal microscopy and transient (time-resolved) photothermal-lens modalities. It was shown that only the part of the transient thermal-lens heating curve of the dispersed sample with light-absorbing particles when the photothermally induced thermal field becomes homogeneous should be used to evaluate the bulk thermal diffusivity. For nanodiamond concentrations of 1−4 mg/ mL, a 1−5% increase in thermal diffusivity and thermal conductivity compared with water is observed. A slowdown in the dissipation of the thermal lens effect due to prolonged heat accumulation by nanodiamonds is shown, which is confirmed by significant photothermal signals from nanodiamond clusters according to confocal photothermal microscopy. The size estimation of separate nanodiamond clusters in solution by nonlinear far-field confocal photothermal microscopy is shown; for the selected nanodiamond brands, photothermal microscopy reveals local signals (200−1000 nm) from nanodiamonds that can be assigned to aggregates of ca. 40−70 nm correlated with calculations from the Gibbs−Kelvin equation by differential scanning calorimetry. The discrimination of nonaggregated and aggregated nanodiamonds by photothermal microscopy is demonstrated.

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Section: Results and Discussionmentioning

confidence: 99%

Photothermal and Heat-Transfer Properties of Aqueous Detonation Nanodiamonds by Photothermal Microscopy and Transient Spectroscopy

et al. 2021

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“…In FRET studies, Flu and RhB dyes are extensively used, due to their excellent luminescence properties, such as a high absorption coefficient, high photostability, high fluorescence quantum yield, and relatively long emission wavelength [14,38]. Flu and RhB show maximum absorbance at around 475 nm and 525 nm, with the prominent monomer fluorescence bands around 510 nm and 552 nm, respectively [14,38,53,54]. The analysis was carried out at a fixed excitation wavelength of 430 nm, which was chosen to direct excited Flu, avoiding the emission and absorption spectral overlap of Flu and RhB.…”

Section: Fret Ability Of Phytosynthesized Zno Npsmentioning

confidence: 99%

Biomimetic Synthesis, Characterization, and Evaluation of Fluorescence Resonance Energy Transfer, Photoluminescence, and Photocatalytic Activity of Zinc Oxide Nanoparticles

Wijesinghe¹,

Thiripuranathar²,

Iqbal

et al. 2021

Sustainability

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Owing to the development of nanotechnology, biosynthesis of nanoparticles (NPs) is gaining considerable attention as a cost-effective and eco-friendly approach that minimizes the effects of toxic chemicals used in NP fabrication. The present work reports low-cost phytofabrication of zinc oxide (ZnO) NPs employing aqueous extracts of various parts (leaves, stems, and inflorescences) of Tephrosia purpurea (T. purpurea). The formation, structure, morphology, and other physicochemical properties of ZnO NPs were characterized by ultraviolet–visible (UV–Vis) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, and dynamic light scattering (DLS). UV–Vis spectral analysis revealed sharp surface plasmon resonance (SPR) at around 250–280 nm, while the XRD patterns confirmed distinctive peaks indices to the crystalline planes of hexagonal wurtzite ZnO NPs. TEM analysis confirmed the presence of spherical-shaped ZnO NPs with average particle sizes (PS) between 25–35 nm, which was in agreement with the XRD results. FTIR analysis revealed that phenolics, flavonoids, amides, alkaloids, and amines present in the plant extract are responsible for the stabilization of the ZnO NPs. Further, the hydrodynamic diameter in the range of 85–150 nm was measured using the DLS technique. The fluorescence resonance energy transfer (FRET) ability of biogenic ZnO NPs was evaluated, and the highest efficiency was found in ZnO NPssynthesized via T. purpurea inflorescences extract. Photoluminescence (PL) spectra of biogenic ZnO NPs showed three emission peaks consisting of a UV–Vis region with high-intensity compared to that of chemically synthesized ZnO NPs. The biosynthesized ZnO NPs showed photocatalytic activity under solar irradiation by enhancing the degradation rate of methylene blue (MB). Among the prepared biogenic ZnO NPs, T. purpurea leaves mediated with NPs acted as the most effective photocatalyst, with a maximum degradation efficiency of 98.86% and a half-life of 84.7 min. This is the first report related to the synthesis of multifunctional ZnO NPs using T. purpurea, with interesting characteristics for various potential applications in the future.

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“…[56, 58, 59] The limits of detection of various substances were reached for many of the target compounds, and were as low as n × 10 −11 ‐n × 10 −9 M . In some publications, even higher sensitivity was reported (detection limits of n × 10 −12 ‐n × 10 −11 M) . The next advantage of photothermal methods is the ability to detect ultralow substance concentrations via absorption measurements in volumes between n × 10 −15 ‐n × 10 −9 L. This is due to the small diameters of focused laser beams.…”

Section: Outlooks For Photothermal Characterization Of Cellulose and mentioning

confidence: 99%

“…As a detection method, the selection of TLS as a tool for very sensitive detection of light absorption is a very reliable modality . Another advantage of thermal lens techniques is that compact analytical instruments in the variant of thermal lens microscopy (TLM) were already introduced …”

Section: Outlooks For Photothermal Characterization Of Cellulose and mentioning

confidence: 99%

Advanced Cellulosic Materials for Treatment and Detection of Industrial Contaminants in Wastewater

et al. 2016

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The scarcity of fresh, clean water is one of the most tremendous global crises currently facing the human race. Various technologies exist for the treatment of contaminated water on different waste volume scales, for specific pollutants, and at a range of cost points. The use of agricultural and industrial by‐products directly or with simple modifications for treating wastewater has been investigated thoroughly, and the new frontier in this field is the development of advanced cellulose materials which are low cost, highly efficient, and widely applicable. Concurrently, developing highly sensitive and selective methods for analyzing the remediation efficiency of these materials is important as low concentrations of industrial contaminants can cause severe health problems in humans. The focus of this review is current progress in advanced cellulose materials for treatment of industrially‐contaminated wastewater, particularly that which contains dyes, heavy metals, and petrochemicals, and the development of ultrasensitive technologies such as photothermal spectroscopy (PTS) and photoacoustic spectroscopy (PAS) for pollutant detection.

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Multi-wavelength thermal-lens spectrometry for high-accuracy measurements of absorptivities and quantum yields of photodegradation of a hemoprotein–lipid complex

Cited by 15 publications

References 81 publications

Photothermal and Heat-Transfer Properties of Aqueous Detonation Nanodiamonds by Photothermal Microscopy and Transient Spectroscopy

Photothermal and Heat-Transfer Properties of Aqueous Detonation Nanodiamonds by Photothermal Microscopy and Transient Spectroscopy

Biomimetic Synthesis, Characterization, and Evaluation of Fluorescence Resonance Energy Transfer, Photoluminescence, and Photocatalytic Activity of Zinc Oxide Nanoparticles

Advanced Cellulosic Materials for Treatment and Detection of Industrial Contaminants in Wastewater

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