Real time single TiO2 nanoparticle monitoring of the photodegradation of methylene blue

Oliveira, Guilherme H.; Galante, Miguel T.; Martins, Thalyta Tavares; Santos, Leonardo F. dos; Ely, Fernando; Longo, Claudia; Gonçalves, Renato V.; Muniz, Sérgio Ricardo; Nome, René A.

doi:10.1016/j.solener.2019.08.006

Cited by 15 publications

(13 citation statements)

References 26 publications

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“…Data analysis algorithms were developed in-house and are based in our previous published works. Further details of the experimental setup and data analysis are described in references [10][11][12][13].…”

Section: Methodsmentioning

confidence: 99%

“…More recently, we have reported mechanistic studies of photocatalytic degradation of organic molecules with in situ micro-spectroscopy and optical tweezers: we monitored images and time-dependent spectra, and quantitative optical microscopy was used to characterize spatially-dependent reaction rates and correlate with stochastic dynamics of individual catalytic nanoparticles. [13] In the present work, we study mechanisms of a model reaction for oxygen evolution with timeresolved spectroscopies, imaging and simulations. We choose to study hydrogen peroxide disproportionation during hydrogen peroxide reaction with potassium permanganate, a well-known reaction.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen peroxide disproportionation: time-resolved optical measurements of spectra, scattering and imaging combined with correlation analysis and simulations

Ibrahim

Nome

2022

Journal of Molecular Structure

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We study how time-dependent optical measurements of spectra, scattering, and imaging can be used to add to the understanding of heterogeneous reactions, compared to work performed using tools developed for homogeneous reactions. Using hydrogen peroxide disproportionation by potassium permanganate as a model reaction, we measure the entire spectrum over reaction time, enabling a clear and useful correlation analysis and assignment of chemical species in heterogeneous conditions. We measure time-dependent dynamic light scattering to study oxygen nanobubble product formation kinetics and equilibrium. We perform macroscopic video-rate reaction imaging and information-theoretic analysis to characterize reaction and transport contributions to the observed signal. To illustrate the differences arising from measuring sample subsets vs the entire system, we integrate stochastic and macroscopic numerical simulations of reaction-diffusion to study homogeneous and heterogeneous reaction conditions. We hope the tools presented here may help understanding other chemical reactions in heterogeneous conditions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrogen peroxide disproportionation: time-resolved optical measurements of spectra, scattering and imaging combined with correlation analysis and simulations

Ibrahim

Nome

2022

Journal of Molecular Structure

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“…Prior to the measurements, the samples were taken to a tip sonicator to ensure particle dispersion and colloidal stability, which was checked by dynamic light scattering (DLS) particle size measurement. Upconversion microscopy and optical tweezers measurements were performed as described previously [26,27]. Briefly, a 975 nm laser beam is sent to a nonlinear microscope set up in a vertical, epifluorescence geometry.…”

Section: Methodsmentioning

confidence: 99%

On the Fly” Characterization of YbIII:ErIII Co-Doped Upconversion Nanoparticle Nonlinear Optical Response from Single-Particle Trajectories

Cavalcante¹,

Marchi²,

Sígoli³

et al. 2021

Preprint

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<p> Spectroscopic characterization of individual nanoparticles is essential for understanding their structure-property relationship and for applications. Upconversion nanoparticles (UCNPs) in condensed phases can undergo both nonlinear optical and stochastic dynamics when interacting with near-infrared sources. By integrating optical trapping microspectroscopy, stochastic dynamics and light-matter interactions experiments and simulations, in the present work we study how individual trajectories of YbIII:ErIII co-doped UCNPs can be used to perform “on the fly” characterization of their nonlinear optical power-law response upon near-infrared excitation. We illustrate the methodology in the case of freely diffusing and optically trapped UCNPs as well as with particles bound to the substrate. The approach presented in this work can be applied to UCNPs with varying composition and morphological features, particularly in single-particle studies.</p>

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“…Foi também utilizada uma amostra de nanotubo * * de TiO 2 , com diâmetro externo médio de 60 nm e comprimentos entre centenas de nanometros até alguns micrometros (43), * * A amostra de nanotubos é mesma descrita na ref. (43). Detalhes das dimensões físicas dos nanotubos podem ser observadas na Fig.…”

Section: Nanotubos De Tiounclassified

“…O uso de um AOM possibilitou a modulação espacial do feixe e, por consequência, da pinça, com precisão de nanometros em uma escala de frequências de 1 Hz a 10 kHz. O sistema construído foi caracterizado e ainda está em contínuo estágio de desenvolvimento, mas já viabiliza alguns estudos interessantes com micro e nanopartículas, conforme mostrado nesta dissertação e em estudos com nanotubos que deram origem ao trabalho publicado na referência(43). No futuro, como um próximo passo de desenvolvimento deste trabalho, esse sistema será estendido e ampliado para explorar outros sistemas físicos de interesse do laboratório.De modo cronológico, o sistema inicial foi constituído, basicamente, por um laser de infravermelho, responsável pelo aprisionamento óptico, um conjunto de lentes de magnificação e uma objetiva, responsável pela focalização do feixe, e espelhos adequados, como o espelho dicroico, importante para o aprisionamento e observação das amostras.…”

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Aprisionamento óptico de micropartículas e desenvolvimento de potenciais ópticos dinâmicos

Martins¹

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À minha família, que sempre esteve presente, mesmo nos momentos de distância. Agradeço aos meus pais Robson e Lucia, pelo cuidado, amor e, principalmente, pela amizade que temos, à minha irmã Maria Vallentina, aos meus avós João e Altair e à minha madrasta Adriana, pelo carinho e por terem contribuído de diversas formas na minha trajetória até aqui. Aos amigos do laboratório e aos que acabaram se tornando parte dele, pela ajuda, pelas conversas e pelo café. Ao meu orientador, Prof. Dr. Sérgio Muniz, pela oportunidade e confiança. Agradeço imensamente pelos ensinamentos, pela paciência e, principalmente, pelo apoio que recebi durante os anos de mestrado. Aos colaboradores, Prof. Dr. René Nome, Prof. Dr. Sebastião Pratavieira, Prof. Dr. Renato Gonçalves e Prof. Dr. Fernando Lanças, pelo auxílio em diversos momentos e por fornecer materiais e amostras fundamentais para o desenvolvimento do trabalho. Ao CNPq pelo auxílio financeiro.

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Real time single TiO2 nanoparticle monitoring of the photodegradation of methylene blue

Cited by 15 publications

References 26 publications

Hydrogen peroxide disproportionation: time-resolved optical measurements of spectra, scattering and imaging combined with correlation analysis and simulations

Hydrogen peroxide disproportionation: time-resolved optical measurements of spectra, scattering and imaging combined with correlation analysis and simulations

On the Fly” Characterization of YbIII:ErIII Co-Doped Upconversion Nanoparticle Nonlinear Optical Response from Single-Particle Trajectories

Aprisionamento óptico de micropartículas e desenvolvimento de potenciais ópticos dinâmicos

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