PhotoRAFT Polymerization of Vinylidene Fluoride Using a Household White LED as Light Source at Room Temperature

ChemPhotoChem ◽  
2019 ◽  
Vol 3 (11) ◽  
pp. 1095-1099 ◽  
Author(s):  
Qizhi Yang ◽  
Vincent Ladmiral ◽  
Bruno Améduri
Keyword(s):  
Light Source ◽  
Room Temperature ◽  
Vinylidene Fluoride ◽  
White Led

Degradation in a Methyl-phenyl Co-Polymeric Polysilane for LED Applications

2003 ◽  
Vol 769 ◽  
Author(s):  
Asha Sharma ◽  
Deepak ◽  
Monica Katiyar ◽  
Satyendra Kumar ◽  
V. Chandrasekhar ◽  
...  
Keyword(s):  
Thin Films ◽  
Molecular Weight ◽  
Light Source ◽  
Room Temperature ◽  
Light Exposure ◽  
Room Temperature Photoluminescence ◽  
Pl Spectrum ◽  
Pl Intensity ◽  
Methyl Phenyl

AbstractThe optical degradation of polysilane copolymer has been studied in spin cast thin films and solutions using light source of 325 nm wavelength. The room temperature photoluminescence (PL) spectrum of these films show a sharp emission at 368 nm when excited with a source of 325 nm. However, the PL intensity deteriorates with time upon light exposure. Further the causes of this degradation have been examined by characterizing the material for its transmission behaviour and changes occurring in molecular weight as analysed by GPC data.

Preparation and Characterization of Modified PVDF-g-PSSA Membrane

2010 ◽  
Vol 152-153 ◽  
pp. 44-50 ◽  
Author(s):  
Gui Bao Guo ◽  
Er Ding Han ◽  
Sheng Li An
Keyword(s):  
Relative Humidity ◽  
Sodium Silicate ◽  
Room Temperature ◽  
Proton Exchange Membrane ◽  
Vinylidene Fluoride ◽  
Proton Exchange ◽  
Poly Vinylidene Fluoride ◽  
Relative Humidity Range ◽  
Exchange Membrane

A new method based on a solution graft technique was used to prepare poly (vinylidene fluoride) grafted polystyrene sulfonated acid (PVDF-g-PSSA) proton exchange membrane. Polystyrene is grafted into PVDF modified by plain sodium silicate (Na4SiO4). There is a linear relationship between the degree of grafting and the content of Na4SiO4. Fourier transform infrared spectroscopy is used to characterize changes of the membrane's microstructures after grafting and sulfonation. The morphology of the membrane's microstructures after grafting and sulfonation is studied by scanning electrolytic microscope (SEM). The effect of plain sodium silicate (Na4SiO4) concentration and relative humidity on the conductivity of the electrolyte was investigated by the impedance at room temperature. The results show that the styrene has been grafted into PVDF. The conductivity of PVDF-g-PSSA electrolyte doped 10% plain sodium silicate (Na4SiO4) is 0.016 S/cm at room temperature. The conductivity of the electrolyte changes slightly at a relative humidity range of 20%-70%. The weightlessness of PVDF-g-PSSA electrolyte heated to 40°C was less than 2%, which indicated that water capacity was good.

scholarly journals AP1.2 - A novel flexible room-temperature NO2 sensor based on WO3 integrated with white LED lamps

2018 ◽  
Author(s):  
X. Geng ◽  
C. Zhang ◽  
H. Charlier ◽  
M. Debliquy ◽  
D. Lahem ◽  
...  
Keyword(s):  
Room Temperature ◽  
White Led ◽  
No2 Sensor

Design of White LED Light Source for Noble LCD Backlight Module

2008 ◽  
Vol 495 (1) ◽  
pp. 80/[432]-96/[448] ◽  
Author(s):  
L. S. Chou ◽  
I-Hsin Lin
Keyword(s):  
Light Source ◽  
White Led ◽  
Led Light

Study on Extraction Technology and Stability of Melanin from Banana Peel

2013 ◽  
Vol 815 ◽  
pp. 287-292
Author(s):  
Li Jing Min ◽  
Jing Fen Li
Keyword(s):  
Metal Ions ◽  
Light Source ◽  
Room Temperature ◽  
Ph Value ◽  
Orthogonal Test ◽  
Raw Material ◽  
Banana Peel ◽  
Extraction Temperature ◽  
Solution Ph ◽  
Extraction Technology

[Objectiv The aim is to study the extraction technology of melanin from banana peel, and discuss its stability. [Metho We used banana peel as raw material, the absorbance at 410 nm as the index, extracted melanin by base-acid method, and optimized the extraction technology by the single factor and orthogonal test. Then we discussed the melanins stability at different temperature, light source, pH value, metal ions, antioxidant and reducing agents.[Result The best extraction conditions of melanin is that, hydrochloric acid soak time 5 h, alkaline solution pH value 14, extracting time 20 min, extraction temperature 70 °C, absorbance value about 0.309 A. Melanin from banana peel is stable at high temperature, different light source irradiation, reducing agent coexist; but at room temperature, metal ions and oxidizing agent coexist, it is unstable. [Conclusio This study provided experimental basis for the optimization and development of melanin from banana peel.

A room temperature light source based on silicon nanowires

2016 ◽  
Vol 613 ◽  
pp. 59-63 ◽  
Author(s):  
M.J. Lo Faro ◽  
C. D'Andrea ◽  
E. Messina ◽  
B. Fazio ◽  
P. Musumeci ◽  
...  
Keyword(s):  
Light Source ◽  
Silicon Nanowires ◽  
Room Temperature

scholarly journals Supplementary Light Source Affects Growth, Metabolism, and Physiology ofAdenophora triphylla(Thunb.) A.DC. Seedlings

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Ya Liu ◽  
Xiuxia Ren ◽  
Byoung Ryong Jeong
Keyword(s):  
Light Source ◽  
Soluble Sugar ◽  
Antioxidant Systems ◽  
Light Sources ◽  
White Led ◽  
Medicinal Species ◽  
Shoot Ratio ◽  
Practical Strategy ◽  
Supplementary Lighting ◽  
Cancer And Inflammation

Adenophora triphylla(Thunb.) A.DC., a well-known herbaceous medicinal species, has been reported to protect against human obesity, cancer, and inflammation. Supplementary lighting is a practical strategy to improve crop quality, especially at a propagation stage. However, there has been no study available on the optimal supplementary light source for the commercial production ofA. triphyllaseedlings. In this study, plug seedlings were cultivated in a greenhouse for four weeks under an average daily light intensity of 490μmol·m−2·s−1PPFD coming from the sun and a supplemental lighting (16 h per day) at 120μmol·m−2·s−1PPFD provided by high pressure sodium (HPS), metal halide (MH), far-red (FR) light, white LED (red: green: blue = 2:4:3, LED-w), or mixed (red: green: blue = 4:1:4) LED (LED-mix). The results showed that LED-mix, with a higher percentage of red and blue light, substantially promoted seedling growth compared to other treatments by increasing stem diameter, biomass, specific leaf weight, and root to shoot ratio. The LED-mix also promoted accumulation of soluble sugar, starch, and chlorophyll in the tissue and increased contents of total phenols and flavonoids. Moreover, stomata density and pore area per leaf area under the LED-mix were remarkably greater than those under other treatments. Furthermore, the Western blot analysis revealed that the expression of photosynthetic protein, D1, was notably enhanced by the LED-mix as compared with other light sources. In addition, the LED-mix alleviated the oxidative damage of seedlings by improving enzymatic and nonenzymatic antioxidant systems. Collectively, these results suggest that the LED-mix was the optimal supplementary light source for the production of highest qualityA. triphyllaseedlings.

scholarly journals Rapid synthesis of hybrid methylammonium lead iodide perovskite quantum dots and rich MnI2 substitution favouring Pb-free warm white LED applications

2019 ◽  
Vol 1 (8) ◽  
pp. 2999-3008 ◽  
Author(s):  
Rajan Kumar Singh ◽  
Sudipta Som ◽  
Somrita Dutta ◽  
Neha Jain ◽  
Mei-Tsun Kuo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Environmental Pollution ◽  
Room Temperature ◽  
White Led ◽  
Lead Iodide ◽  
Rapid Synthesis ◽  
Temperature Synthesis ◽  
Room Temperature Synthesis ◽  
Perovskite Quantum Dots ◽  
Methylammonium Lead Iodide

We present a facile room temperature synthesis of CH3NH3Pb1−xMnxI3 perovskite quantum dots (PQDs) substituting manganese (Mn2+) at the lead (Pb2+) sites to minimize environmental pollution and make it commercially feasible.

scholarly journals Silicon nanowire and carbon nanotube hybrid for room temperature multiwavelength light source

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Maria Josè Lo Faro ◽  
Cristiano D’Andrea ◽  
Elena Messina ◽  
Barbara Fazio ◽  
Paolo Musumeci ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Light Source ◽  
Room Temperature ◽  
Silicon Nanowire

Intensities in Raman spectra III. A photoelectric recording Raman spectrometer for intensity measurements

1956 ◽  
Vol 237 (1209) ◽  
pp. 186-196 ◽  
Keyword(s):  
Light Source ◽  
High Intensity ◽  
Room Temperature ◽  
Recording System ◽  
Photoelectric Recording ◽  
Intensity Measurements ◽  
Wide Range ◽  
Recording Potentiometer ◽  
Phase Sensitive ◽  
High Intensity Light

A description is given of a Raman apparatus designed primarily for intensity measurements by direct photo-electric recording. A special feature is a high- intensity light source with four Toronto-type mercury arcs. It is possible to use a variety of sample volumes and to make measurements on samples over a wide range of temperatures both above and below room temperature. Semi-quantitative polarization measurements can also be made. The recording system uses an E. M. I. eleven-stage photomultiplier cell with a. c. amplification at 285 c/s, followed by rectification in a phase-sensitive homodyne circuit. The output is fed to a Cambridge recording potentiometer. Details of calibration for intensity measurements are given and sample records are shown illustrating the various applications of the apparatus.

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