Oliveira 2015 iadr
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This study evaluated changes in optical properties during light-curing of resin-composites containing different photo-initiators. Five experimental resin-composites containing different photo-initiators were light cured and measurements were taken of light transmittance, color, translucence, and degree of conversion before and after curing. The increases in light transmittance and translucence during curing varied significantly depending on the photo-initiator, with composites containing camphorquinone showing the highest increases, likely due to its photo-bleaching effect. While degree of conversion also varied between photo-initiators, it did not directly correlate with changes in optical properties.
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International Journal of Engineering Research and Applications (IJERA) aims to cover the latest outstanding developments in the field of all Engineering Technologies & science.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Radiochemical Properties of Irradiated PVA\AgNO3 Film by Electron Beam
Radiochemical Properties of Irradiated PVA\AgNO3 Film by Electron BeamInternational Journal of Science and Research (IJSR)
The PVA bulk solution was first prepared by dissolving PVA powder (5 wt %) in distilled water under controlling water bath temperature at 60-70 0C and continuous stirring for 3 hours, After the solution cooled down to ambient temperature, a concentration of (0.01and 0.03 wt%) of AgNO3 were added to solution in a darkroom and stirred for 2 hours, then the blend solution is poured into Petri dishes and allowed to dry to form films by casting under ambient temperature for 3 days in a darkroom, after draying the films were cut to 2cmx2cm and kept in black pags. The films were exposed to different doses (2, 4, 6, 8, 10 Gy) from a linear accelerator by constant energy 6 MeV with applicator cone and SSD (applicator surface distance) 50 cm, field size 10cmx10 cm. The characterization by by UV-visible spectroscopy showed that the pure PVA has an absorption peak in the range of ultraviolet at 275 nm and the absorption peak increases with radiation dose increment from 0 to 10 Gy and the composites films (PVA\AgNO3) showed an absorption peak coefficient at 420 nm (visible light) which is also increases as the radiation dose increases. Also the energy band gap of the composites irradiated films appeared to be decreases from 4.0E-19 down to 3.5E-19 eV. Moreover the optical density of the irradiated films showed significant correlation (R2 = 0.99) with the applied dose. While the tensile strength (TS) of the irradiated PVA film has been increases following the increment of radiation dose and peaking at 30 MPa at 6 Gy, then decreases as the dose increase. The study also revealed that there is a significant (R2 =96) linear proportional relationship between the absorption coefficient and the applied dose on the PVA film.
Pushkar N Patil
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3rd paper.Pdf
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Silver nanoparticle incorporation effect on
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30120140502001
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morphology-pmma-pcbm
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Simultaneous voltammetric determination of paracetamol anddomperidone based o...
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For improvements in chromatic scales and luminescent fluxes of white lights: ...
This study compares red-phosphor LaOF:Eu3+ impacts on a single-film remote phosphor configuration (SRPC) and a double-film remote phosphor configuration (DRPC). Mie theory is used to demonstrate the relationship between light flux and color quality. SRPC is a phosphor layer consisting of LaOF:Eu3+ particles mixed with YAG:Ce3+. Meanwhile, DRPC is two separate films of red and yellow phosphors. To increase scattering properties, we added 5% SiO2 into phosphor layers. The differences in structure affect significantly white light emitting diodes’ (WLEDs’) optical properties. Attained figures and statistics show that the color rendering indices (CRIs) increase along with the concentrations of both structures, and these numbers are approximately similar. However, DPRC exhibits a color quality scale (CQS) of 74 in all examined chromatic temperatures (5600 K - 8500 K), which is greater than SRPC’s 71 at 8500 K. Besides, the luminous efficiencies (LEs) in DRPC are more outstanding than that of SRPC, at given LaOF:Eu3+ concentration percentages (2%-14%). To summarize, DRPC offers greater benefits in luminous flux and color quality, compared to SRPC. Choosing the proper red light phosphor concentration, on the other hand, becomes a crucial aspect of achieving the ideal CQS and LEs.
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Oliveira 2015 iadr
- 1. Dayane Oliveira Oregon Health and Science University Department of Dental Materials e-mail: oliveira.day@icloud.com Changes in Optical Properties During Light-curing of Resin-composites Containing Different Photo-initiators Dayane Oliveira*, Mario Coelho Sinhoreti & Jack Liborio Ferracane Objectives: The aim of this study was to evaluate the change in optical properties during light-curing of resin-composites containing different photo-initiators. Materials and Methods: Five experimental resin-composites with the same resin blend/filler loading and containing different photo- initiators (CQ+DMAEMA; PPD; PPD+DMAEMA; TPO or BAPO) were light-cured in 1mm thick Delrin disks (φ=6mm; n=3) with the bottom surface placed over the sensor of a MARC Resin Calibrator to measure light-transmittance (TT). Color measurements were taken over white and black backgrounds using a pre-calibrated chromameter (CR-221) before and after light-curing. Two LEDs (Radii: λ=420–540nm and Bluephase G2: λ=380-420nm+420-540nm) were used with same irradiance (1300mW/cm 2 ) for 30s. CIE L*a*b* and CIExyY systems were used to access color and translucence (TP) changes, respectively. To assess DC, a FT-IR spectrometer (Nicolet 6700) was used to measure the non-polymerized and post-polymerized blends after photo-polymerization using near-IR analysis. Data were analyzed by ANOVA and Tukeyʼs test for multiple comparisons (α=0.05). Results: Increases in TT during light-curing varied significantly with photo-initiator type: CQ+DMAEMA (87-131%: from 225 to 550mW/cm 2 ) > PPD (26-51%: 400-600mW/cm 2 ) > PPD+DMAEMA (20-37%: 410-565mW/cm 2 ) > BAPO (15-24%: 440-660mW/cm 2 ) > TPO (8-18%: 460-575mW/cm 2 ), as shown in Figure 1. Increases in TP also varied with the photo-initiators: BAPO (5%: from 8 to 13%) > CQ+DMAEMA (4%: 9%-14%) = TPO (4%: 8-13%) > PPD (1.5%: 8-12%) > PPD+DMAEMA (1%: 10-11.5%), as shown in Figure 2. These increases were not directly related to differences in DC (CQ: ~60%; PPD: ~12%; PPD+DMAEMA: ~50%; TPO: 3-68%; BAPO: 50-69%, as shown in Figure 3), which would increase the refractive index match between the resin/filler during curing. The greater change for CQ seems to be related to the effect of photo-bleaching shown by Δb (CQ: -19; PPD: -6; PPD+DMAEMA: -10; BAPO: -7; TPO: -3, as shown in Figure 4). Conclusions: Within the limitations imposed by the experimental design used in this study, the following conclusions can be drawn: 1- TT and TP increased during curing regardless of the photo-initiators or the light-curing unit evaluated; 2- Resin composites containing CQ showed higher TT and TP increases during light-curing compared to the other photo-initiators evaluated, especially when light- curing with the 420-540nm range exclusively due to photo-bleaching effect.