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Astrath NGC, Bergmann EV, Anghinoni B, Flizikowski GAS, Novatski A, Jacinto C, Požar T, Kalin M, Malacarne LC, Baesso ML. Towards a comprehensive characterization of spatio-temporal dependence of light-induced electromagnetic forces in dielectric liquids. Sci Rep 2024; 14:5595. [PMID: 38454075 PMCID: PMC10920765 DOI: 10.1038/s41598-024-56176-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Accepted: 03/03/2024] [Indexed: 03/09/2024] Open
Abstract
The interaction of localized light with matter generates optical electrostriction within dielectric fluids, leading to a discernible change in the refractive index of the medium according to the excitation's light profile. This optical force holds critical significance in optical manipulation and plays a fundamental role in numerous photonic applications. In this study, we demonstrate the applicability of the pump-probe, photo-induced lensing (PIL) method to investigate optical electrostriction in various dielectric liquids. Notably, the thermal and nonlinear effects are observed to be temporally decoupled from the electrostriction effects, facilitating isolated observation of the latter. Our findings provide a comprehensive explanation of optical forces in the context of the recently introduced microscopic Ampère electromagnetic formalism, which is grounded in the dipolar approximation of electromagnetic sources within matter and characterizes electrostriction as an electromagnetic-induced stress within the medium. Here, the optical force density is re-obtained through a new Lagrangian approach.
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Affiliation(s)
- N G C Astrath
- Department of Physics, Universidade Estadual de Maringá, Maringá, PR, 87020-900, Brazil.
| | - E V Bergmann
- Department of Physics, Universidade Estadual de Maringá, Maringá, PR, 87020-900, Brazil
| | - B Anghinoni
- Department of Physics, Universidade Estadual de Maringá, Maringá, PR, 87020-900, Brazil
| | - G A S Flizikowski
- School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON, K1N6N5, Canada
| | - A Novatski
- Department of Physics, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, 84030-900, Brazil
| | - C Jacinto
- Institute of Physics, Universidade Federal de Alagoas, Maceió, AL, 57072-900, Brazil
| | - T Požar
- Faculty of Mechanical Engineering, University of Ljubljana, 1000, Ljubljana, Slovenia
| | - M Kalin
- Faculty of Mechanical Engineering, University of Ljubljana, 1000, Ljubljana, Slovenia
| | - L C Malacarne
- Department of Physics, Universidade Estadual de Maringá, Maringá, PR, 87020-900, Brazil
| | - M L Baesso
- Department of Physics, Universidade Estadual de Maringá, Maringá, PR, 87020-900, Brazil
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2
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Franko M, Baesso ML, Paltauf G, Spagnolo V. Editorial. Photoacoustics 2023; 32:100542. [PMID: 37692755 PMCID: PMC10492003 DOI: 10.1016/j.pacs.2023.100542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Affiliation(s)
- M Franko
- University of Nova Gorica, Nova Gorica, Slovenia
| | - M L Baesso
- State University of Maringa, Maringa, Brazil
| | | | - V Spagnolo
- Tachnical University of Bari, Bari, Italy
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3
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Flizikowski GAS, Bergmann EV, Bazachi A, Mendes RS, Novatski A, Jacinto C, Baesso ML, Malacarne LC, Astrath NGC. Optical detection of the ultrasound-induced pulsed thermal lens close to the ice-water phase transition. Appl Opt 2023; 62:5094-5098. [PMID: 37707211 DOI: 10.1364/ao.496255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Accepted: 06/05/2023] [Indexed: 09/15/2023]
Abstract
Piezo-optic and thermo-optic coefficients are important material properties that play a critical role in the design and optimization of many optical devices. The ability to accurately measure and control these coefficients is essential for achieving high performance and reliability in a wide range of applications. In this article, we use the optical detection of the ultrasound-induced thermal lens effect to investigate these properties for water at low temperatures. The results show that the anomalous behavior of water around 4°C is easily observed. The thermal lens method is used to determine the temperature dependence of the piezo-optic and thermo-optic coefficients.
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4
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Ribeiro CM, Souza M, Pelegrini BL, Palacios RS, Lima SM, Sato F, Bento AC, Baesso ML, Lima MMS. Ex vivo UV-vis and FTIR photoacoustic spectroscopy of natural nanoemulsions from cellulose nanocrystals and saponins topically applied into the skin: Diffusion rates and physicochemical evaluation. J Photochem Photobiol B 2022; 236:112587. [PMID: 36283255 DOI: 10.1016/j.jphotobiol.2022.112587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 09/29/2022] [Accepted: 10/13/2022] [Indexed: 12/15/2022]
Abstract
Nanoemulsions are increasingly gaining importance in the development of topically applied medicine and cosmetic products because their small droplets favor the penetration rates of active compounds into the body. In this scenario, the measurements of their diffusion rates as well as eventual physicochemical changes in the target tissues are of utmost importance. It is also recognized that the use of natural surfactants can avoid allergic reactions as frequently observed for synthetic products. The natural saponins extracted from Sapindus Saponaria have the property of forming foam and are exploited as biocompatible and biodegradable, while cellulose nanocrystals are known to increase the stability of a formulation avoiding the coalescence of drops at the interface. Therefore, nanoemulsions combining natural saponins and cellulose nanocrystals are promising systems that may facilitate greater diffusion rates of molecules into the skin, being candidates to substitute synthetic formulations. This study applied the Photoacoustic Spectroscopy technique to measure the diffusion rates and the physicochemical properties of nanoemulsified formulations containing saponins and cellulose nanocrystals topically applied to the skin. The ex vivo study combined the first-time photoacoustic measurements performed in both ultraviolet-visible and mid-infrared spectral regions. The toxicity of these formulations in L929 cells was also evaluated. The results showed that the formulations were able to propagate throughout the skin to a depth of approximately 756 μm, reaching the dermal side. The non-observation of absorbing band shifting or new bands in the FTIR spectra suggests that there were no structural changes in the skin as well as in the formulations after the nanoemulsions administration. The cytotoxicity results showed that the increase of cellulose nanocrystals concentration decreased cellular toxicity. In conclusion, the results demonstrated the advantage of combining photoacoustic methods in the ultraviolet-visible and mid-infrared spectral regions to analyze drug diffusion and interaction with the skin tissues. Both methods complement each other, allowing the confirmation of the nanoemulsion diffusion through the skin and also suggesting there were no detectable physicochemical changes in the tissues. Formulations stabilized with saponins and cellulose nanocrystals showed great potential for the development of topically administered cosmetics and drugs.
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Affiliation(s)
- C M Ribeiro
- Departamento de Farmácia, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - M Souza
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - B L Pelegrini
- Departamento de Farmácia, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - R S Palacios
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - S M Lima
- Centro de Estudos em Recursos Naturais- CERNA, Universidade Estadual de Mato Grosso do Sul-UEMS, 351, Dourados, MS, Brazil
| | - F Sato
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - A C Bento
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - M L Baesso
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil.
| | - M M S Lima
- Departamento de Farmácia, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil.
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Astrath NGC, Flizikowski GAS, Anghinoni B, Malacarne LC, Baesso ML, Požar T, Partanen M, Brevik I, Razansky D, Bialkowski SE. Unveiling bulk and surface radiation forces in a dielectric liquid. Light Sci Appl 2022; 11:103. [PMID: 35443703 PMCID: PMC9021243 DOI: 10.1038/s41377-022-00788-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 03/29/2022] [Accepted: 04/04/2022] [Indexed: 06/14/2023]
Abstract
Precise control over light-matter interactions is critical for many optical manipulation and material characterization methodologies, further playing a paramount role in a host of nanotechnology applications. Nonetheless, the fundamental aspects of interactions between electromagnetic fields and matter have yet to be established unequivocally in terms of an electromagnetic momentum density. Here, we use tightly focused pulsed laser beams to detect bulk and boundary optical forces in a dielectric fluid. From the optical convoluted signal, we decouple thermal and nonlinear optical effects from the radiation forces using a theoretical interpretation based on the Microscopic Ampère force density. It is shown, for the first time, that the time-dependent pressure distribution within the fluid chiefly originates from the electrostriction effects. Our results shed light on the contribution of optical forces to the surface displacements observed at the dielectric air-water interfaces, thus shedding light on the long-standing controversy surrounding the basic definition of electromagnetic momentum density in matter.
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Affiliation(s)
- N G C Astrath
- Department of Physics, Universidade Estadual de Maringá, Maringá, PR, Brazil.
| | - G A S Flizikowski
- Department of Physics, Universidade Estadual de Maringá, Maringá, PR, Brazil
| | - B Anghinoni
- Department of Physics, Universidade Estadual de Maringá, Maringá, PR, Brazil
| | - L C Malacarne
- Department of Physics, Universidade Estadual de Maringá, Maringá, PR, Brazil
| | - M L Baesso
- Department of Physics, Universidade Estadual de Maringá, Maringá, PR, Brazil
| | - T Požar
- Faculty of Mechanical Engineering, University of Ljubljana, Ljubljana, Slovenia
| | - M Partanen
- Department of Electronics and Nanoengineering, Aalto University, Aalto, Finland
| | - I Brevik
- Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway
| | - D Razansky
- Institute for Biomedical Engineering and Institute of Pharmacology and Toxicology, Faculty of Medicine, University of Zurich, Zurich, Switzerland
- Institute for Biomedical Engineering, Department of Information Technology and Electrical Engineering, ETH Zurich, Zurich, Switzerland
| | - S E Bialkowski
- Department of Chemistry and Biochemistry, Utah State University, Logan, UT, USA
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Sabino VD, Súarez YR, Andrade LHC, Lima SM, Morais GR, Guimarães FB, Bento AC, Baesso ML, Silva JR. Photoacoustic for thermal diffusivity determination of fish scale: A methodology for environmental integrity monitoring. J Photochem Photobiol B 2022; 227:112379. [PMID: 34998114 DOI: 10.1016/j.jphotobiol.2021.112379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 10/09/2021] [Accepted: 12/23/2021] [Indexed: 06/14/2023]
Abstract
In this work the thermal diffusivity (D) of Astyanax lacustris fish scale is investigated aiming to use it for environmental integrity certification. The D values were obtained by a relatively simple procedure by a photoacoustic method. The chosen fish species is from wide occurrence in Brasil's basins. It has short migration, and it has also been used as environmental bioindicator. The results obtained in 195 scales sampled from three different streams in the Midwest region in Brazil gives an average value of D ~ 4 × 10-3 cm2/s. ANCOVA analysis demonstrated that D values are able to differentiate among the three basins and indicates that it is dependent on the scales thickness and water conductivity. This last one is strongly affected by biotic and abiotic actions, so that D values measured by photoacoustic method can be used for interpreting the environmental integrity from where the fishes were sampled.
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Affiliation(s)
- V D Sabino
- Centro de Estudos em Recursos Naturais- CERNA, Universidade Estadual de Mato Grosso do Sul-UEMS, 351, Dourados, MS, Brazil
| | - Y R Súarez
- Centro de Estudos em Recursos Naturais- CERNA, Universidade Estadual de Mato Grosso do Sul-UEMS, 351, Dourados, MS, Brazil
| | - L H C Andrade
- Centro de Estudos em Recursos Naturais- CERNA, Universidade Estadual de Mato Grosso do Sul-UEMS, 351, Dourados, MS, Brazil
| | - S M Lima
- Centro de Estudos em Recursos Naturais- CERNA, Universidade Estadual de Mato Grosso do Sul-UEMS, 351, Dourados, MS, Brazil
| | - G R Morais
- Campus Estreito/Centro de Ciências Agrárias, Naturais e Letras, Universidade Estadual da Região Tocantina do Maranhão-UEMASUL, 65976-000 Estreito, MS, Brazil
| | - F B Guimarães
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - A C Bento
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - M L Baesso
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - J R Silva
- Centro de Estudos em Recursos Naturais- CERNA, Universidade Estadual de Mato Grosso do Sul-UEMS, 351, Dourados, MS, Brazil.
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Lopes L, Terada R, de Castro-Hoshino LV, de Oliveira B, Pascotto RC, Baesso ML, Tabchoury C, Sato F, Nicholson JW, Sidhu SK. In Vitro Evaluation of the Stabilization Time of Chemical Bonds During Setting Reaction and Microhardness of Preheated Glass-Ionomer Cements. Oper Dent 2021; 46:208-218. [PMID: 34192337 DOI: 10.2341/19-250-l] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/20/2020] [Indexed: 11/23/2022]
Abstract
OBJECTIVES To evaluate the effect of preheating glass-ionomer cement (GIC) restorative materials on stabilization time (ST) of their metal carboxylate bonds and on microhardness. METHODS AND MATERIALS Two conventional highviscosity GICs, Ketac Universal (3M ESPE) and Equia Forte (GC), were evaluated. The thermographic camera was used to measure the temperature inside the glass-ionomer cement capsules before and after heating. The preheating of capsules was performed at 54°C for 30 seconds in a commercial device. Characterization of ST in the GICs was determined by Fourier Transform Infrared (FTIR) spectroscopy. For this, 10 samples of each material were prepared, five in the non-preheated group (control) and five with preheating. FTIR spectra were obtained 10 minutes after mixing (control group) or after heating and then every 10 minutes for 120 minutes. For the microhardness test, 20 cylindrical specimens (3 mm height × 6 mm diameter) were prepared for each material (10 preheated, 10 control). The microhardness was determined at three time intervals: 10 minutes after mixing, after the ST as detected through the FTIR part of the study, and after one week. Knoop microhardness was assessed using a diamond indenter with a 25 g load and 15 seconds dwell time. RESULTS Ketac Universal showed an increase in temperatures of 15.7°C for powder and 3.6°C for liquid, while Equia Forte showed 16.4°C for powder and 8.5°C for liquid. FTIR spectra indicated that preheating reduced the ST for Equia Forte but increased it for Ketac Universal. Preheating increased the initial microhardness (T1) of Equia Forte. With maturation over one week, it was observed that preheating significantly improved the microhardness of both materials compared with the control specimens. CONCLUSION Preheating influenced the ST and the microhardness of Ketac Universal and Equia Forte. The ST and microhardness of Ketac Universal increased after seven days, whereas Equia Forte showed a reduced ST and increased microhardness from the outset.
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Ubaldini ALM, Pascotto RC, Sato F, Soares VO, Zanotto ED, Baesso ML. Effects of Bioactive Agents on Dentin Mineralization Kinetics After Dentin Bleaching. Oper Dent 2020; 45:286-296. [DOI: 10.2341/18-272-l] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Objectives:
This study evaluated effects of Bioglass 45S5 (BG) and Biosilicate (BS) remineralization on the chemical composition and bond strength of control dentin (CD) and bleached dentin (BD) surfaces.
Methods and Materials:
Dentin bleaching treatment was performed using the walking bleaching technique with 0.01 g of sodium perborate and 0.5 mL of 3% hydrogen peroxide for 14 days. Remineralization treatment was carried out by rubbing a remineralization solution (0.015 g of BG or BS diluted in 1.35 mL of distilled water) on the etched dentin surface for 30 seconds. Micro-Raman spectroscopy (MRS) was used to quantitatively analyze the mineral matrix ratios of CD and BD (n=5) after remineralization treatment with BG and BS over 15 days of incubation in artificial saliva. The CD and BD discs (n=10) with and without remineralization treatment with BG and BS were restored using a two-step etch-and-rinse adhesive system (Optibond S, Kerr) and five layers of 1-mm-thick composite resin (Filtek Z250, 3M ESPE). The restored dentin discs were sectioned into nine bonded beams with cross-sectional areas of approximately 0.9 mm2 and tested for microtensile bond strength (μTBS). The dentin surface of one fractured beam per tooth was submitted to MRS to characterize the physicochemical composition (n=10) at the interface. The data were analyzed using one-way analysis of variance and the Tukey-Kramer post hoc test (p<0.005).
Results:
MRS bioactive analyses revealed that both BG and BS promoted increased mineral matrix ratios in the CD and BD. Significantly higher μTBS values were found after CD treatment with BG (CD: 57 MPa±11; CD-BG: 78 MPa±15) and when BG and BS were applied to the BD (BD: 42 MPa±5; BD-BG: 71 MPa±14; BD-BS: 64 MPa±11) (p<0.005). The MRS analysis of the fractured dentin beam showed that the remineralization treatment significantly increased the dentin relative mineral concentration and promoted the appearance of new interface peaks, indicating a chemical interaction (p<0.005).
Conclusion:
Remineralization of BD is an effective therapy to restore damage caused by dentin bleaching and acid conditioning. This approach not only increases dentin mineral compounds but also improves dentin's ability to interact chemically with the adhesive system.
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Affiliation(s)
- ALM Ubaldini
- Adriana Lemos Mori Ubaldini, DDS, PhD, Department of Dentistry, State University of Maringá, Maringá, PR, Brazil
| | - RC Pascotto
- Renata Corrêa Pascotto, DDS, PhD, Department of Dentistry, State University of Maringá, Maringá, PR, Brazil
| | - F Sato
- Francielle Sato, PhD, Department of Physics, State University of Maringá, Maringá, PR, Brazil
| | - VO Soares
- Viviane Oliveira Soares, PhD, Department of Science, State University of Maringá, Goioerê, PR, Brazil
| | - ED Zanotto
- Edgar Dutra Zanotto, PhD, Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP, Brazil
| | - ML Baesso
- Mauro Luciano Baesso, PhD, Department of Physics, State University of Maringá, Maringá, PR, Brazil
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Flizikowski GAS, Capeloto OA, Camargo VG, Anghinoni B, Baesso ML, Malacarne LC, Belançon MP, Požar T, Astrath NGC. Laser induced thermoelastic surface displacement in solids detected simultaneously by photothermal mirror and interferometry. Opt Express 2020; 28:7116-7124. [PMID: 32225946 DOI: 10.1364/oe.386344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 02/10/2020] [Indexed: 06/10/2023]
Abstract
We propose a combined pump-probe optical method to investigate heat diffusion properties of solids. We demonstrate single-shot simultaneous laser-induced thermoelastic surface displacement of metals detected by concurrent measurements using photothermal mirror and interferometry. Both methods probe the surface displacement by analyzing the wavefront distortions of the probe beams reflected from the surface of the sample. Thermoelastic properties are retrieved by transient analysis in combination with numerical description of the thermoelastic displacement and temperature rise in the sample and in the surrounding air. This technique presents a capability for material characterization that can be extended to experiments for quantitative surface mapping.
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Tsuzuki F, de Castro-Hoshino L, Lopes L, Sato F, Baesso M, Terada R. Evaluation of the influence of light-curing units on the degree of conversion in depth of a bulk-fill resin. J Clin Exp Dent 2020; 12:e1117-e1123. [PMID: 33282131 PMCID: PMC7700784 DOI: 10.4317/jced.57288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 07/02/2020] [Indexed: 11/05/2022] Open
Abstract
Background It is known that bulk-fill have been widely studied and used by dentists in the clinic. However, the use of light-curing units that do not have the ability to adequately light-cure these materials at the appropriate depth can affect their clinical performance. The aim of this study was evaluating the influence of 5 different light curing units (LCUs) on the degree of conversion (DC) of a bulk-fill resin at depths of 0 to 4 mm and determined the effect of using 20s exposure and 40s.
Material and Methods Cylinders of composite were made in a stainless steel matrix (n=10). The specimens were exposed from the top surface using 5 LCUs: Valo® Cordless (VA); Radii Plus (RA); Emitter.D (EM), Biolux Plus (BI), Woodpecker® (WO). The emission wavelength and the power density was determined. After the photoactivation, the Raman vibrational modes were calculated taking as reference the peaks at 1,601 (aromatic bonds C=C) and 1,640 cm-1 (aliphatic bonds C=C).
Results The largest difference in DC in 20s, comparing the values obtained in the first and last layer is for BI, with a variation from 61.24% to 53.86%. Comparing the LCUs, the last layer in 40s DC values are 57.40% (BI), 58.21% (WO), 58.97% (VA), 60.90% (RA) and 62.42% (EM). The higher the dose (J/cm²) and the close the λmax is to the maximum CQ absorption length (λmax ~ 470 nm) the better the DC value.
Conclusions There was a significant difference in the DC values between the LCUs with increasing depth of the bulk-fill increments. Results indicate significant differences in DC among the different LCUs as well as enhanced DC when using 40s exposure compared to 20s. It is suggested that for DC improvement using lower power photoactivator increase the exposure time the exposure time should be 20s to 40s. Key words:Polymerization, Composite Resins, Raman spectroscopy.
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11
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Oliveira BMB, Ubaldini ALM, Baesso ML, Andrade LHC, Lima SM, Giannini M, Hernandes L, Pascotto RC. Chemical Interaction and Interface Analysis of Self-Etch Adhesives Containing 10-MDP and Methacrylamide With the Dentin in Noncarious Cervical Lesions. Oper Dent 2018; 43:E253-E265. [DOI: 10.2341/17-366-l] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Objectives:
To characterize the chemical interactions and analyze the interface of adhesive systems containing 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) and N-methacryloyl glycine (methacrylamide) functional monomers with the dentin in noncarious cervical lesions (NCCLs) compared with artificial defects (ADs).
Methods and Materials:
Twenty human teeth with natural NCCLs on the buccal surface were used. Class V cavities, similar to NCCLs, were created on the lingual surface to serve as controls. Teeth were randomly allocated to two groups according to the functional monomer in the adhesive (N=10): G1, 10-MDP; and G2, methacrylamide. NCCLs and ADs were characterized by their mineral composition (MC) and degree of demineralization (DD) using micro-Raman spectroscopy, adhesive/dentin chemical interactions (CIs) were assessed with infrared photoacoustic spectroscopy, and interface morphology was evaluated with scanning electron and light microscopy. MC, CI, and DD data were submitted to Shapiro-Wilk and Student t-tests (p<0.05).
Results:
Compared with ADs, dentin in NCCLs was hypermineralized (p<0.05). In G1, CI, and DD in the first 2 μm, and adhesive projections in NCCLs and ADs interfaces were similar. Additionally, a thin layer of dentin collagen was observed in ADs, while it was hardly present in NCCLs. In G2, although CI could not be identified, changes in the mineral components were observed. The DD in the ADs and NCCLs were statistically similar, while SEM showed a lack of adhesion at NCCLs interface. DD and collagen exposure in the ADs and NCCLs were more pronounced than in G1.
Conclusions:
Results suggest that the G1 adhesive could be applied directly on the superficial sclerotic layer in NCCLs. In contrast, previous cavity preparation should be conducted to improve the micromechanical interaction of G2 with the dentin.
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Affiliation(s)
- BMB Oliveira
- Bruna M B Oliveira, DDS, MSc, State University of Maringá, Dentistry, Av Mandacaru, 1550, Maringá, Paraná 87010-060, Brazil
| | - ALM Ubaldini
- Adriana L M Ubaldini, DDS, MSc, Av Mandacaru, 1550, Maringá, 87.080-000, Brazil
| | - ML Baesso
- Mauro L Baesso, PhD, State University of Maringá, Physics, Av Colombo, 5790, Maringá, 87020900, Brazil
| | - LHC Andrade
- Luis H C Andrade, PhD, State University of Mato Grosso do Sul, Physics, Cidade Universitária de Dourados, Dourados, Mato Grosso do Sul 79804-970, Brazil
| | - SM Lima
- Sandro M Lima, PhD, State University of Mato Grosso do Sul, Physics, Cidade Universitária de Dourados, Dourados, Mato Grosso do Sul 79804-970, Brazil
| | - M Giannini
- Marcelo Giannini, DDS, MSc, PhD, Piracicaba Dental School, University of Campinas, Department of Restorative Dentistry, Av Limeira, 901, Piracicaba, SP 13414-903, Brazil
| | - L Hernandes
- Luzmarina Hernandes, PhD, State University of Maringá, Morphological Sciences Department, Av Colombo, 5790, Maringá, Paraná 87020900, Brazil
| | - RC Pascotto
- Renata C Pascotto, DDS, MSc, PhD, State University of Maringá (UEM), Dentistry, Maringá, PR 87.080-000, Brazil
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12
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Oliveira BMB, Ulbaldini ALM, Sato F, Baesso ML, Bento AC, Andrade LHC, Lima SM, Pascotto RC. Chemical Interaction Analysis of an Adhesive Containing 10-Methacryloyloxydecyl Dihydrogen Phosphate (10-MDP) With the Dentin in Noncarious Cervical Lesions. Oper Dent 2017; 42:357-366. [DOI: 10.2341/16-062-l] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
The purpose of this study was to evaluate the chemical bonds of a self-etch 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) adhesive to natural noncarious cervical lesions (NCCLs) and compare them with those occurring in sclerotic dentin in artificially prepared defects (APDs). Four human teeth with natural NCCLs on the buccal surface were selected. Artificial defects matching the natural lesions were prepared on the lingual surface of the same teeth serving as control. Micro-Raman (MR) spectroscopy was used to quantify mineral content in natural NCCLs and in APDs. Fourier transform infrared-photoacoustic spectroscopy (FTIR-PAS) readouts were taken before and after adhesive application to analyze the protein matrix/mineral (M:M) ratio and chemical interactions between 10-MDP adhesive and dentin. The MR and FTIR-PAS spectra collected from natural NCCLs demonstrated a larger area of the band (961 cm−1, PO4) and lower M:M ratio, respectively, characterizing a hypermineralized dentin, compared with APDs. FTIR-PAS demonstrated emergence of a peak (1179 cm−1, P=O) in spectra after adhesive treatment, demonstrating a more intense chemical interaction in natural NCCLs. The results demonstrated that chemical bonding of 10-MDP adhesive to natural NCCLs is more intense, due to the hypermineralized surface, and suggest that it is unnecessary to remove the hypermineralized layer with burs, as this may decrease the chemical bonding potential of 10-MDP.
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Affiliation(s)
| | - ALM Ulbaldini
- Adriana L.M. Ulbaldini, Maringá, DDS, MSc, Dentistry, State University of Maringá, Maringá, Paraná, Brazil
| | - F Sato
- Francielle Sato, PhD, Physics, State University of Maringá, Maringá, Paraná, Brazil
| | - ML Baesso
- Mauro L. Baesso, PhD, Physics, State University of Maringá, Maringá, Paraná, Brazil
| | - AC Bento
- Antonio Carlos Bento, PhD, Physics, State University of Maringá, Paraná, Brazil
| | - LHC Andrade
- Luis H. C. Andrade, PhD, Physics, State University of Mato Grosso do Sul, Cidade Universitária de Dourados, Dourados, Mato Grosso do Sul, Brazil
| | - SM Lima
- Sandro M. Lima, PhD, Physics, State University of Mato Grosso do Sul, Cidade Universitária de Dourados, Dourados, Mato Grosso do Sul, Brazil
| | - RC Pascotto
- Renata C. Pascotto, DDS, MSc, PhD, Dentistry, State University of Maringá, Maringá, Paraná, Brazil
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13
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Muniz RF, de Ligny D, Martinet C, Sandrini M, Medina AN, Rohling JH, Baesso ML, Lima SM, Andrade LHC, Guyot Y. In situ structural analysis of calcium aluminosilicate glasses under high pressure. J Phys Condens Matter 2016; 28:315402. [PMID: 27300313 DOI: 10.1088/0953-8984/28/31/315402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In situ micro-Raman spectroscopy was used to investigate the structural evolution of OH(-)-free calcium aluminosilicate glasses, under high pressure and at room temperature. Evaluation was made of the role of the SiO2 concentration in percalcic join systems, for Al/(Al + Si) in the approximate range from 0.9 to 0.2. Under high pressure, the intensity of the main band related to the bending mode of bridging oxygen ([Formula: see text][T-O-T], where T = Si or Al) decreased gradually, suggesting that the bonds were severely altered or even destroyed. In Si-rich glasses, compression induced a transformation of Q (n) species to Q (n-1). In the case of Al-rich glass, the Al in the smallest Q (n) units evolved from tetrahedral to higher-coordinated Al (([5])Al and ([6])Al). Permanent structural changes were observed in samples recovered from the highest pressure of around 15 GPa and, particularly for Si-rich samples, the recovered structure showed an increase of three-membered rings in the Si/Al tetrahedral network.
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Affiliation(s)
- R F Muniz
- Institut Lumière Matière, UMR 5306 CNRS-Université Lyon 1, Université de Lyon, Villeurbanne, France. Departamento de Física, Universidade Estadual de Maringá, Maringá-PR, 87020-900, Brazil
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14
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Savi EL, Malacarne LC, Baesso ML, Pintro PTM, Croge C, Shen J, Astrath NGC. Investigation into photostability of soybean oils by thermal lens spectroscopy. Spectrochim Acta A Mol Biomol Spectrosc 2015; 145:125-129. [PMID: 25770935 DOI: 10.1016/j.saa.2015.02.106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Revised: 02/19/2015] [Accepted: 02/24/2015] [Indexed: 06/04/2023]
Abstract
Assessment of photochemical stability is essential for evaluating quality and the shelf life of vegetable oils, which are very important aspects of marketing and human health. Most of conventional methods used to investigate oxidative stability requires long time experimental procedures with high consumption of chemical inputs for the preparation or extraction of sample compounds. In this work we propose a time-resolved thermal lens method to analyze photostability of edible oils by quantitative measurement of photoreaction cross-section. An all-numerical routine is employed to solve a complex theoretical problem involving photochemical reaction, thermal lens effect, and mass diffusion during local laser excitation. The photostability of pure oil and oils with natural and synthetic antioxidants is investigated. The thermal lens results are compared with those obtained by conventional methods, and a complete set of physical properties of the samples is presented.
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Affiliation(s)
- E L Savi
- Departamento de Física, Universidade Estadual de Maringá, Maringá, PR 87020-900, Brazil
| | - L C Malacarne
- Departamento de Física, Universidade Estadual de Maringá, Maringá, PR 87020-900, Brazil
| | - M L Baesso
- Departamento de Física, Universidade Estadual de Maringá, Maringá, PR 87020-900, Brazil
| | - P T M Pintro
- Departamento de Agronomia, Universidade Estadual de Maringá, Maringá, PR 87020-900, Brazil
| | - C Croge
- Departamento de Agronomia, Universidade Estadual de Maringá, Maringá, PR 87020-900, Brazil
| | - J Shen
- Energy, Mining and Environment Portfolio, National Research Council Canada, Vancouver, BC V6T-1W5, Canada
| | - N G C Astrath
- Departamento de Física, Universidade Estadual de Maringá, Maringá, PR 87020-900, Brazil.
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15
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Ximendes EC, Silva WF, Vermelho MVD, Astrat NGC, Malacarne LC, Baesso ML, Catunda T, Jacinto C. Modeling population and thermal lenses in the presence of Auger Upconversion for Nd(3+) doped materials. Opt Express 2015; 23:15983-15991. [PMID: 26193573 DOI: 10.1364/oe.23.015983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present a theoretical model to thermal (TL) and population (PL) lenses effects in the presence of Auger upconversion (AU) for analysis of Nd(3+) doped materials. The model distinguishes and quantifies the contributions from TL and PL. From the experimental and theoretical results, the AU cannot be neglected because it plays an important role on the excited state population and therefore on the temperature and polarizability difference between excited and ground states. Considering the extensive use of these techniques, the model presented here could be useful for the investigation of materials and also to avoid misleading analysis of lenses transients.
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16
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Capeloto OA, Lukasievicz GVB, Zanuto VS, Herculano LS, Souza Filho NE, Novatski A, Malacarne LC, Bialkowski SE, Baesso ML, Astrath NGC. Pulsed photothermal mirror technique: characterization of opaque materials. Appl Opt 2014; 53:7985-7991. [PMID: 25607877 DOI: 10.1364/ao.53.007985] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The time-resolved thermal mirror technique is developed under pulsed laser excitation for quantitative measurement of thermal and mechanical properties of opaque materials. Heat diffusion and thermoelastic equations are solved analytically for pulsed excitation assuming surface absorption and an instantaneous pulse. Analytical results for the temperature change and surface displacement in the sample are compared to all-numerical solutions using finite element method analysis accounting for the laser pulse width and sample geometry. Experiments are performed that validate the theoretical model and regression fitting is performed to obtain the thermal diffusivity and the linear thermal expansion coefficient of the samples. The values obtained for these properties are in agreement with literature data. The technique is shown to be useful for quantitative determinations of the physics properties of metals with high thermal diffusivity.
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17
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Malacarne LC, Savi EL, Baesso ML, Lenzi EK, Astrath NGC. Role of photophysics processes in thermal lens spectroscopy of fluids: a theoretical study. J Phys Chem A 2014; 118:5983-8. [PMID: 25017719 DOI: 10.1021/jp505255a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Photophysics processes are ubiquitous in nature and difficult to be quantitatively characterized by conventional spectroscopy. Alternatively, pump-probe methods have been widely applied to study these complex processes. In this context, the thermal lens technique is a precise spectroscopic tool for material characterization and presents a wide range of applications in chemical analysis. Here, we present an all numerical approach to analyze the dynamics of photophysics processes and to identify the role of individual contributions of photoreaction and mass diffusion in the thermal lens experiments. The results are essential for a proper understanding of the dominant physical mechanisms in laser-induced photodegradation, which allow precise data analysis of the effects in photosensitive fluids.
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Affiliation(s)
- L C Malacarne
- Departamento de Física, Universidade Estadual de Maringá , Maringá, Paraná 87020-900, Brazil
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18
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Rodrigues TP, Zanuto VS, Cruz RA, Catunda T, Baesso ML, Astrath NGC, Malacarne LC. Discriminating the role of sample length in thermal lensing of solids. Opt Lett 2014; 39:4013-4016. [PMID: 24978795 DOI: 10.1364/ol.39.004013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Thermal lens (TL) is a key effect in laser engineering and photothermal spectroscopy. The amplitude of the TL signal or its dioptric power is proportional to the optical path difference (OPD) between the center and border of the beam, which is proportional to the heat power (Ph). Due to thermally induced mechanical stress and bulging of end faces of the sample, OPD depends critically on the geometry of the sample. In this investigation, TL measurements were performed as a function of the sample length keeping the same Ph. It is experimentally demonstrated that for materials with positive ∂n/∂T OPD increases typically 30 to 50% with the decrease of sample length (from long rod to thin-disk geometry). For materials with negative ∂n/∂T, this variation is much larger due to the cancelation of the different contributions to OPD with opposite signs. Furthermore, the experimental investigation presented here validates a recently proposed unified theoretical description of the TL effect.
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19
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Bianchi GS, Zanuto VS, Astrath FBG, Malacarne LC, Terra IAA, Catunda T, Nunes LAO, Jacinto C, Andrade LHC, Lima SM, Baesso ML, Astrath NGC. Resonant excited state absorption and relaxation mechanisms in Tb3+-doped calcium aluminosilicate glasses: an investigation by thermal mirror spectroscopy. Opt Lett 2013; 38:4667-4670. [PMID: 24322101 DOI: 10.1364/ol.38.004667] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Resonant excited state absorption (ESA) and relaxation processes in Tb(3+)-doped aluminosilicate glasses are quantitatively evaluated. A model describing the excitation steps and upconversion emission is developed and applied to interpret the results from laser-induced surface deformation using thermal mirror spectroscopy. The fluorescence quantum efficiency of level (5)D(4) was found to be close to unity and concentration independent while, for the level (5)D(3), it decreases with Tb(3+) concentration. Emission spectroscopy measurements supported these results. ESA cross sections are found to be more than three orders of magnitude higher than the ground state absorption cross section.
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20
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Silva JR, Malacarne LC, Baesso ML, Lima SM, Andrade LHC, Jacinto C, Hehlen MP, Astrath NGC. Modeling the population lens effect in thermal lens spectrometry. Opt Lett 2013; 38:422-424. [PMID: 23455089 DOI: 10.1364/ol.38.000422] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report a theoretical model and experimental results for laser-induced lensing in solids. The model distinguishes and quantifies the contributions from population and thermal effects. Laser-induced lensing in ytterbium-doped fluorozirconate glass ZBLAN:Yb(3+) is measured, and the thermal and optical properties obtained from analyzing the data with the proposed model agree well with published values. Photothermal techniques are used extensively for the investigation of laser and laser-cooling materials, and the model developed here enables the interpretation of convoluted laser-induced lensing signals that have contributions from different sources.
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Affiliation(s)
- J R Silva
- Departamento de Física, Universidade Estadual de Maringá, Maringá, Paraná 87020-900, Brazil
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21
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Rocha ACP, Andrade LHC, Lima SM, Farias AM, Bento AC, Baesso ML, Guyot Y, Boulon G. Tunable color temperature of Ce3+/Eu2+, 3+ co-doped low silica aluminosilicate glasses for white lighting. Opt Express 2012; 20:10034-10041. [PMID: 22535094 DOI: 10.1364/oe.20.010034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this paper we report results of tunable lighting in Ce(3+)/Eu(2+,3+) doped low silica calcium aluminosilicate glass. Optical spectroscopy experiments indicate that there is a red color compensation from Eu(2+) and Eu(3+) to the green emission from Ce(3+), resulting in a broad and tunable emission spectra depending on the excitation wavelength. This result analysed in the CIE 1976 color diagram shows a close distance from the Plank emission and a correlated color temperature, varying from 5200 to 3500K. This indicates that our system can be easily excited by GaN based blue LEDs, being an interesting phosphor for white lighting devices.
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Affiliation(s)
- A C P Rocha
- Grupo de Espectroscopia Óptica e Fototérmica, Universidade Estadual de Mato Grosso do Sul-UEMS, MS Dourados, C. P. 351 CEP 79804-970, Brazil.
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22
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Malacarne LC, Astrath NGC, Medina AN, Herculano LS, Baesso ML, Pedreira PRB, Shen J, Wen Q, Michaelian KH, Fairbridge C. Soret effect and photochemical reaction in liquids with laser-induced local heating. Opt Express 2011; 19:4047-58. [PMID: 21369233 DOI: 10.1364/oe.19.004047] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We report a theoretical model and experimental results for laser-induced local heating in liquids, and propose a method to detect and quantify the contributions of photochemical and Soret effects in several different situations. The time-dependent thermal and mass diffusion equations in the presence and absence of laser excitation are solved. The two effects can produce similar transients for the laser-on refractive index gradient, but very different laser-off behavior. The Soret effect, also called thermal diffusion, and photochemical reaction contributions in photochemically reacting aqueous Cr(VI)-diphenylcarbazide, Eosin Y, and Eosin Y-doped micellar solutions, are decoupled in this work. The extensive use of lasers in various optical techniques suggests that the results may have significance extending from physical-chemical to biological applications.
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Affiliation(s)
- L C Malacarne
- Departamento de Física, Universidade Estadual de Maringá, Maringá-PR, Brazil.
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23
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Velasco DS, de Moura AP, Medina AN, Baesso ML, Rubira AF, Cremona M, Bento AC. Preparation, characterization, and spectroscopic properties of PC/PMMA doped blends: study of the effect of rare-earth doping on luminescence, quenching rate, and lifetime enhancement. J Phys Chem B 2010; 114:5657-60. [PMID: 20387870 DOI: 10.1021/jp911900r] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Optical properties of highly transparent blends formed by bisphenol A polycarbonate (PC) and poly(methyl methacrylate) (PMMA) and doped with either europium(III) thenoyltrifluoroacetone hydrate [Eu(TTA)(3)-hydrate] or terbium(III) acetylacetonate hydrate [Tb(ACAC)(3)-hydrate] were studied. From the absorption/emission spectra (200 to 800 nm), percolation limits of less than 0.4 wt/wt% for Eu and above 0.7 wt/wt% for Tb were found. Lifetimes for 20/80 and 60/40 Tb-doped blends were from 1.0 to 1.5 ms, respectively, about 5 times longer than for a similar blend prepared with Langmuir-Blodgett film. For blends doped with Eu, the lifetimes were from 0.4 to 0.8 ms, almost double that for the pure complex. The results indicated interactions between the PC/PMMA blends and the rare-earth ion complex. Particularly, photoluminescent spectra evidenced the incorporation of the Eu(3+) and Tb(3+) ions into the blend, with quenching observed near 1.0 wt/wt%, except for the 20/80 blend doped with Eu ion, in which luminescence increased to 5 wt/wt %.
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Affiliation(s)
- D S Velasco
- Departamento de Física, Universidade Estadual de Maringá, Avenida Colombo 5790, 87020-900, Maringá, Paraná, Brazil
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24
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Astrath NGC, Shen J, Baesso ML, Astrath FBG, Malacarne LC, Pedreira PRB, Bento AC, Zhou J. Material characterization with top-hat cw laser induced photothermal techniques: A short review. ACTA ACUST UNITED AC 2010. [DOI: 10.1088/1742-6596/214/1/012014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Lima SM, Silva JR, Andrade LHC, Novatski A, Medina AN, Bento AC, Baesso ML, Guyot Y, Boulon G. High values of gain cross section and luminescence quantum efficiency in OH(-)-free Ti3+-doped low-silica calcium aluminosilicate glass. Opt Lett 2010; 35:1055-1057. [PMID: 20364215 DOI: 10.1364/ol.35.001055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We recently reported that Ti(3+)-doped low-silica calcium aluminosilicate glass presents long luminescence lifetime (170 micros) and broad emission band (190 nm) shifted toward the visible region when compared with those from Ti(3+):sapphire single crystal and Ti(3+)-doped glasses [Phys. Rev. Lett.100, 027402 (2008)]. Here we demonstrate that this glass also shows high values of both gain cross section (approximately 4.7 x 10(-19) cm(2)) and luminescence quantum efficiency (approximately 70%). By comparing these values with those for Ti(3+):sapphire crystal, we can conclude that the studied Ti(3+)-doped glass is a promising system for tunable solid-state lasers.
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Affiliation(s)
- S M Lima
- Grupo de Espectroscopia Optica e Fototérmica, Universidade Estadual de Mato Grosso do Sul-UEMS, C.P. 351, Dourados, Mato de Grosso do Sul, Brazil.
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26
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Sampaio JA, Filadelpho MC, Andrade AA, Rohling JH, Medina AN, Bento AC, da Silva LM, Gandra FCG, Nunes LAO, Baesso ML. Study on the observation of Eu2+ and Eu3+ valence states in low silica calcium aluminosilicate glasses. J Phys Condens Matter 2010; 22:055601. [PMID: 21386346 DOI: 10.1088/0953-8984/22/5/055601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The optical, magnetic and structural properties of Eu doped low silica calcium aluminosilicate glasses were investigated. The optical absorption coefficient presented two bands at 39,246 and 29,416 cm(-1), which were assigned respectively to the [Formula in text], and [Formula in text] transitions of Eu(2+). The fluorescence measured at 300 K on a sample doped with 0.5 wt% of Eu(2)O(3) exhibited a broad band centered at 17,350 cm(-1), which is attributed to the [Formula in text] transition of Eu(2+), whereas the additional peaks are due to the [Formula in text] transitions of Eu(3+). From magnetization and XANES data it was possible to evaluate the fractions of Eu(2+) and Eu(3+) for the sample doped with 0.5 and 5.0 wt% of Eu(2)O(3), the values of which were approximately 30 and 70%, respectively.
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Affiliation(s)
- J A Sampaio
- Laboratório de Ciências Físicas, Universidade Estadual do Norte Fluminense, Avenida Alberto Lamego 2000, CEP 28013-600, Campos dos Goytacazes, RJ, Brazil.
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27
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Astrath NGC, Steimacher A, Rohling JH, Medina AN, Bento AC, Baesso ML, Jacinto C, Catunda T, Lima SM, Karthikeyan B. Thermal lens and interferometric method for glass transition and thermo physical properties measurements in Nd2O3 doped sodium zincborate glass. Opt Express 2008; 16:21248-21255. [PMID: 19104555 DOI: 10.1364/oe.16.021248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In this work the time resolved thermal lens method is combined with interferometric technique, the thermal relaxation calorimetry, photoluminescence and lifetime measurements to determine the thermo physical properties of Nd(2)O(3) doped sodium zincborate glass as a function of temperature up to the glass transition region. Thermal diffusivity, thermal conductivity, fluorescence quantum efficiency, linear thermal expansion coefficient and thermal coefficient of electronic polarizability were determined. In conclusion, the results showed the ability of thermal lens and interferometric methods to perform measurements very close to the phase transition region. These techniques provide absolute values for the measured physical quantities and are advantageous when low scan rates are required.
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Affiliation(s)
- N G C Astrath
- Departamento de Física, Universidade Estadual de Maringá, Av. Colombo 5790, 87020-900, Maringá, PR, Brasil.
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28
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Andrade LHC, Lima SM, Novatski A, Udo PT, Astrath NGC, Medina AN, Bento AC, Baesso ML, Guyot Y, Boulon G. Long fluorescence lifetime of Ti3+-doped low silica calcium aluminosilicate glass. Phys Rev Lett 2008; 100:027402. [PMID: 18232921 DOI: 10.1103/physrevlett.100.027402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2007] [Indexed: 05/25/2023]
Abstract
This Letter reports the formation of Ti3+ in OH- free aluminosilicate glass melted under vacuum condition, with a very long lifetime (170 micros) and broad emission band shifted towards the visible region. This lifetime value was attributed to the trapping of the excited electrons by the glass defects and detrapping by thermal energy, and it is 2 orders of magnitude higher than those published for Ti3+ doped materials. Our results suggest that this glass is a promising system to overcome the challenge of extending the spectral range of traditional tunable solid state lasers towards the visible region.
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Affiliation(s)
- L H C Andrade
- Grupo de Espectroscopia Optica e Fototérmica, Universidade Estadual de Mato Grosso do Sul-UEMS, C. P. 351, CEP 79804-970, Dourados, MS, Brazil.
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29
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Jacinto C, Vermelho MV, de Araujo MT, Udo PT, Astrath NG, Bento AC, Catunda T, Baesso ML. Thermal lens study of energy transfer in Yb(3+)/Tm(3+)-co-doped glasses. Opt Express 2007; 15:9232-9238. [PMID: 19547264 DOI: 10.1364/oe.15.009232] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Energy transfer (ET) and heat generation processes in Yb(3+)/Tm(3+)-co-doped low-silica calcium-aluminosilicate glasses were investigated using thermal lens and photoluminescence measurements. Stepwise ET processes from Yb(3+) to Tm(3+), with excitation at 0.976 mum, produced efficient emission in the mid-infrared range at around 1.8 mum, with high fluorescence quantum efficiency (~0.50) and relatively low thermal loading (</=0.42). An equation was deduced for the description of the thermal lens results which provided the absolute value of the ET efficiency and optimal Tm3+ concentration that result in population of the 1.8 mum Tm(3+) emitting level. These results suggest that the studied co-doped system would be a promising candidate for the construction of high-power diode-pumped solid-state lasers in the mid-infrared range, which are especially important for the purpose of medical procedures.
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30
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Caldeira AMF, Neto AM, Bento AC, Baesso ML, Silva MA, de Almeida A. Behavior of oxidation in the radiochromic gel dosimeter through photoacoustic technique measurements. Appl Radiat Isot 2007; 65:605-9. [PMID: 17349796 DOI: 10.1016/j.apradiso.2007.01.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2006] [Revised: 11/22/2006] [Accepted: 01/10/2007] [Indexed: 10/23/2022]
Abstract
Natural oxidation is an undesirable process suffered by gel dosimetry systems as it changes the values and spatial distribution of absorbed doses. Natural oxidation of Fricke xylenol gel (FXG) dosimeter was inferred from optical absorbance values measured for the first time using the photoacoustic technique. An acoustic detector measures the intensity of the light transmitted by the FXG, which is directly proportional to the ionizing radiation dose absorbed by the samples. In this work, we demonstrated the behavior, the rates, and the dependence of natural oxidation on storage temperature, time, and active components through measurements by photoacoustic technique.
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Affiliation(s)
- A M F Caldeira
- Departamento de Física e Matemática, Universidade de São Paulo, Av Bandeirantes 3900, 1040-91 Ribeirão Preto, SP, Brazil.
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Rocha JCB, Pedrochi F, Hernandes L, de Mello JCP, Baesso ML. Ex vivo evaluation of the percutaneous penetration of proanthocyanidin extracts from Guazuma ulmifolia using photoacoustic spectroscopy. Anal Chim Acta 2007; 587:132-6. [PMID: 17386764 DOI: 10.1016/j.aca.2007.01.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2006] [Revised: 12/21/2006] [Accepted: 01/04/2007] [Indexed: 10/23/2022]
Abstract
In this work photoacoustic spectroscopy has been applied to determine ex vivo the percutaneous penetration of proanthocyanidins present in extracts obtained from Guazuma ulmifolia, in rats. Lotion formulations containing 0.0663 mg of procyanidin B2 day(-1)animal(-1) were topically applied during 7, 10 and 13 days in each group of the animals. After the end of treatment the animals were killed, the skin dissected to remove the basal content, and the measurements were carried out as a function of the period of time of treatment. The results showed that despite the very low concentration of the active principle (procyanidin B2) in the lotion, the photoacoustic method was able to show the presence of optical absorption bands from this substance in the dermis region, evidencing once again that this method may be useful for studies of topically applied formulations of interest in the pharmacokinetic area.
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Affiliation(s)
- J C B Rocha
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Estadual de Maringá, Av. Colombo 5790, 87020-900 Maringá, PR, Brazil
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Dias DT, Medina AN, Baesso ML, Bento AC. Statistical design of experiments: study of cross-linking process through the phase-resolved photoacoustic method as a multivariable response. Appl Spectrosc 2005; 59:173-180. [PMID: 15720757 DOI: 10.1366/0003702053085025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This work presents an add-on result of cross-linking using photoacoustic spectroscopy (PAS) phases in a multivariable process using the phase-resolved photoacoustic (PRPA) method. The method is tested to separate contributions from groupings -OH, -CH(2)-, -CH(3), and Si-OH overtones in the range from 700 to 2600 nm. Samples of the copolymers ethylene vinyltrimethoxysilane (EVS) and grafted vinyltrimethoxysilane (VTS) on low-density polyethylene (LDPE) were prepared having concentrations (C) of 3, 5, and 7% of catalyst and temperatures (T) of 70, 80, and 90 degrees C. By considering the condensation reaction, the reduction of -OH groups is monitored. The PRPA analysis was carried out using the surface response methodology and results indicated the optimum point for both answers (signal and phase-resolved) and for both factors of interest (C, T). For the copolymers, it was found that C approximately (5.00 +/- 1.14)% and T approximately (82.4 +/- 4.3) degrees C, while for grafted LDPE PE(g) it was found that C approximately (4.92 +/- 0.85)% and T approximately (80.8 +/- 2.5) degrees C. These results agreed with the chemical analysis for gel content, which showed as the optimum point 5% of catalyst and temperature of 80 degrees C. Further, it is an advantage that the photoacoustic method allows one to per- form a nondestructive analysis.
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Affiliation(s)
- D T Dias
- Departamento de Física, Universidade Estadual de Maringá, Av. Colombo 5790, 87020-900, Maringá-PR, Brazil
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Pereira JR, Mansanares AM, Palangana AJ, Baesso ML, Barbosa AA, Fernandes PR. Temperature dependence of the coefficient of electronic polarizability in calamitic nematic liquid crystals. Phys Rev E Stat Nonlin Soft Matter Phys 2001; 64:062701. [PMID: 11736221 DOI: 10.1103/physreve.64.062701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2001] [Revised: 07/20/2001] [Indexed: 05/23/2023]
Abstract
In this report the temperature dependence of the coefficient of electronic polarizability (straight phi(i)) is determined by means of the thermal expansion coefficient (beta) and ordinary/extraordinary refractive indexes measurements near the calamitic nematic-isotropic phase transition in a lyotropic mixture of sodium decylsulphonate, decanol, and water. These parameters (straight phi(i) and beta) were related to the extraordinary and ordinary refractive indexes via the temperature derivative of the Vuks's equation. The results showed that near the nematic-isotropic phase transition, the measured value of straight phi(i) was found to be about two orders of magnitude smaller than that obtained for thermotropic, showing a remarkable difference in the molecular electronic polarizability strength between lyotropic and thermotropic liquid crystals.
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Affiliation(s)
- J R Pereira
- Departamento de Física, Universidade Estadual de Maringá, Avenida Colombo, 5790, 87020-900 Maringá, PR, Brazil
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Pereira JR, Mansanares AM, Palangana AJ, Baesso ML. Temperature dependence of the refractive index near the reentrant-isotropic--calamitic-nematic phase transition. Phys Rev E Stat Nonlin Soft Matter Phys 2001; 64:012701. [PMID: 11461309 DOI: 10.1103/physreve.64.012701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2000] [Indexed: 05/23/2023]
Abstract
The laser-induced nonlinear optical response of a lyotropic liquid crystal system in the reentrant-isotropic and calamitic-nematic phases is investigated by the use of the thermal lens technique. The occurrence of an inversion in the temperature coefficient of the ordinary refractive index, dn(radially)/dT, near the reentrant-isotropic-calamitic-nematic phase transition, is discussed. This effect is attributed to the behavior of the electronic polarizability due to the change in micelle shape near the isotropic-nematic transition, and correlated with the results obtained near the nematic-isotropic transition, previously reported.
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Affiliation(s)
- J R Pereira
- Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, Unicamp, Caixa Postal 6165, 13083-970, Campinas, São Paulo, Brazil
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Pereira JR, Palangana AJ, Mansanares AM, da Silva EC, Bento AC, Baesso ML. Inversion in the change of the refractive index and memory effect near the nematic-isotropic phase transition in a lyotropic liquid crystal. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 2000; 61:5410-5413. [PMID: 11031592 DOI: 10.1103/physreve.61.5410] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/1999] [Indexed: 05/23/2023]
Abstract
This work demonstrates the occurrence of dn/dT inversion from negative to positive near the nematic-isotropic phase transition in a lyotropic liquid crystal. It is suggested that this effect can be attributed to a sudden increase of the electronic polarizability due to a change in the micelle shape near this phase transition. Formation of a long lasting lenslike element within the sample when it is irradiated at moderately high laser powers is also reported. This permanent lens is erasable by increasing the temperature above the nematic-isotropic transition temperature.
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Affiliation(s)
- J R Pereira
- Departamento de Física, Universidade Estadual de Maringa, PR, Brazil
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Abstract
Laser-induced photoacoustic signal phase was employed for measurements of optothermal parameters of pig abdomen stratum corneum and epidermis. The non-radiative relaxation time was found to be 28 ms and the thermal diffusion time was 370 ms, yielding a thermal diffusivity value of (4.1 +/- 0.8) x 10(-4) cm2 s-1. This value compares well with other literature values for skin obtained using photothermal techniques.
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Affiliation(s)
- M L Baesso
- Department of Instrumentation and Analytical Science, UMIST, Manchester, UK
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Mansanares AM, Baesso ML, Gandra FC, Vargas H, Miranda LC. Photoacoustic and ESR studies of iron-doped soda-lime glasses: Thermal diffusivity. Phys Rev B Condens Matter 1989; 40:7912-7915. [PMID: 9991221 DOI: 10.1103/physrevb.40.7912] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Baesso ML, Mansanares AM, Vargas H, Miranda LC. Phase-resolved photoacoustic spectroscopy and EPR investigation of MnO2- and CoO-doped soda-lime glasses. Phys Rev B Condens Matter 1989; 40:1880-1884. [PMID: 9992049 DOI: 10.1103/physrevb.40.1880] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Lima GA, Baesso ML, Arguello ZP, Vargas H, Miranda LC. Phase-resolved photoacoustic spectroscopy: Application to metallic-ion-doped glasses. Phys Rev B Condens Matter 1987; 36:9812-9815. [PMID: 9942886 DOI: 10.1103/physrevb.36.9812] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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