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Absorption spectrum
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The silver nanoparticles are synthesized by the green method using Salix semi-solid extract. Fresh leaves are prepared in a semi-solid extract form that retains active substances and can be preserved for a long time. The parameters of the synthesis process are optimized by examining the effects of pH, Salix semi-solid extract concentrations of extract and AgNO3 concentrations through the UV-Vis absorption spectrum of synthetic particulate solutions.
8p
giangnhanly
02-10-2023
6
2
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In this paper we present the development of a multi-axis differential optical absorption spectroscopy instrument capable of sensitively detecting NO2. The instrument collects the sun light scattered by the air molecules and aerosols in the atmosphere and measures the spectrum using a portable spectrometer of high sensitivity.
8p
vispiderman
15-06-2023
3
2
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In this study, quaternary Ag2 MnSnS4 nanocrystalline rods have been successfully synthesized for the first time by the colloidal hot-injection synthesis route and well-organized rod-like nanocrystals (NCs) with lengths ranging from 200 to 350 nm and widths from 10 to 30 nm were obtained. For this structure, the Ag2 MnSnS4 exhibits a semiconductor property with a band-gap of approximately 1.3 eV.
6p
lyhuyenthu
31-01-2023
3
2
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ZnO's ability to decompose organic substances is receiving much attention in multiple applications. ZnO has a broad spectrum of light absorption natural or synthetic, for a wide range of wavelengths, and is an important material with excellent properties, environmentally friendly, nontoxic, inexpensive, and high redox potential features with simple manufacturing methods.
8p
vispyker
16-11-2022
6
1
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Comparison between the calculated and experimental results covering molecular structures, assignment of fundamental vibrational modes, and thermodynamic properties were investigated. The optimized molecular geometries were compared with the experimental data obtained from X-ray data of a similar complex, which indicated that the theoretical results agree with the corresponding experimental values. The UV-Vis spectrum of the compound was also recorded and some properties, such as HOMO and LUMO energies and λmax , were determined using DFT (PW91) method.
12p
langthannam
29-12-2021
20
0
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The inclusion complexation of flavanone with β -cyclodextrin was studied by ultraviolet absorption, steady state fluorescence, time-resolved fluorescence, and 2D ROESY nuclear magnetic resonance spectroscopic techniques. A 1:1 stoichiometric ratio was determined for the inclusion of flavanone with β -cyclodextrin. The Stern–Volmer constant for the accessible fraction of the binding of flavanone with β -cyclodextrin, and the binding constant for the flavanone–β - cyclodextrin complex are reported.
14p
langthannam
29-12-2021
18
1
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A rhodamine B derivative containing 1,2,4-triazole as subunit was characterized as an “off–on” type Cu2+ - selective fluorescent probe. It exhibited high selectivity and sensitivity for Cu2+ in ethanol–water solution (9:1, v:v, pH 7.0, 20 mM HEPES) and underwent ring opening. A prominent fluorescence enhancement at 570 nm was observed in the presence of Cu2+ with the change in the absorption spectrum, and a 1:1 metal–ligand complex was formed.
7p
langthannam
29-12-2021
10
0
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Glutamic functionalized water-soluble perylene diimide, N, N’-di (l-glutamic amine)-perylene-3,4,9,10- tetracarboxylic diimide (GAPTCD) has three absorbance maxima at 469, 498, and 534 nm and two emission peaks at 550 and 587 nm. Owing to the highly negative electrostatic potential of the perylene plane, the perylene derivative showed good water solubility and strong fluorescence in alkali and neutral solutions. Both the absorbance and emission intensities decreased with the decreasing of pH from 9.66 to 5.92.
8p
langthannam
29-12-2021
12
0
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Samples were molded under a hot press and for each sample 50 test samples obtained by cutting them with a water jet. The obtained samples were characterized by TG, FTIR, and SEM. The effect of water absorption was evaluated by measuring percentage water absorption and flexural strength of samples over 9 months. The results revealed that filler addition lowers the damage created by distilled water a considerable amount and addition of hydrophobic fillers to epoxy matrix composites can be especially beneficial for applications where long-term water exposure is desired.
11p
langthannam
29-12-2021
17
1
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Zinc oxide/sodium cellulose composite with different ZnO loadings was prepared for the first time. The crystal structures of cellulose, sodium cellulose, and ZnO/sodium cellulose composite were characterized by FT-IR, XRD, XPS, SEM, and EDX. ZnO/sodium cellulose showed a similar XRD pattern to that of cellulose II. The XPS spectrum emphasized the presence of Zn2+ and Na+ ions in the prepared composite. Additionally, the SEM analysis showed the growth of ZnO crystals on the sodium cellulose surface.
12p
tudichquannguyet
29-11-2021
7
1
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A series of novel BODIPY-bearing electron-withdrawing groups at the meso position are reported here. According to the optical measurements, it may be clearly seen that the introduction of electron-donating groups into 3,5-positions and the presence of electron-withdrawing groups at the meso position of the BODIPY core resulted in spectacular bathochromic shifts (up to ~ 304nm), and the projected photosensitizers had absorption bands in the therapeutic window of the electromagnetic spectrum (600–900nm).
10p
tudichquannguyet
29-11-2021
14
1
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A fluorescent probe based on silicon quantum dots (SiQDs) was developed for the selective and sensitive detection of oxytetracycline (OTC) via the inner filter effect (IFE). The water-soluble fluorescent SiQD was synthesized based on the reaction of 3-Aminopropyltriethoxysilane (APTES) and sodium citrate as precursors by the one-pot hydrothermal process. The strong fluorescence emission of quantum dots (QDs) was obtained at 440 nm when excited at 350 nm and OTC had a broad absorption band between 200 and 400 nm.
10p
tudichquannguyet
29-11-2021
11
1
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Developed a chemometric-photometric analysis process in combination with Kalman filter method to simultaneously analyze mixtures of 2 and 3 substances with molecular absorption spectra overlapping in pharmaceutical samples; apply the process has been built to simultanneously analyze mixtures 2 and 3 substances in some pharmaceuticals are on the market Vietnam.
26p
nguathienthan12
23-05-2021
21
2
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The absorption properties of protein-conjugated metallic nanoparticles are theoretically investigated based on the Mie theory and the core-shell model. Our numerical calculations show that this finding is in good agreement with previous experiments. We provide a better interpretation of the origin of optical peaks in the absorption spectrum of the nanoparticle complex system. Our results can be used in biomedical applications.
7p
chauchaungayxua12
12-05-2021
20
1
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Intersubband optical absorption spectrum was studied in quantum well structures in quantizing magnetic field tilted with respect to the structure layers. Violation of the selection rule forbidding optical intersubband transitions in structures made of quantum wells with an asymmetric potential is proposed. The importance of asymmetric structure design to achieve considerable values of optical absorption is demonstrated.
7p
trinhthamhodang1217
12-01-2021
29
2
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In addition, PAN was a colored reagent and absorption at a wavelength near to the wavelength of maximum absorbance of PAN complexes with metal ions lead to the mutual overlap between the reagent and the complex spectrum.
6p
tamynhan9
02-12-2020
13
2
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The presence of plasmon peak presents around the wavelength of 520nm and an absorption edge with a wavelength less than 450nm on the absorption spectrum reconfirmed the presence of Cu and Cu2O nanoparticles. The cyclic voltammetry measurement was used to study the ethanol oxidation activities of samples. It was found that Cu/Cu2O nanoparticle could catalyze ethanol oxidation in alkali medium.
7p
tamynhan9
02-12-2020
10
2
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Characterization results show that N-doped TiO2 samples have a broader absorption spectrum and a higher antibacterial efficiency against E. coli than pure samples. The DFT calculation suggests that nitrogen ion doping induces the formation of new states closed to the valence band leading to a narrowing of the band gap and a great improvement in photocatalytic activity in the visible light region of the doped material.
8p
tamynhan8
04-11-2020
7
1
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In this study, we focus on optimizing the configurations of the full-sized structure metamaterials by using a genetic algorithm and compare the result’s absorption spectrum to those obtained by two previous methods in Ref.
8p
koxih_kothogmih5
04-09-2020
41
1
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The optical properties of protein-conjugated metallic nanoparticle are theoretically investigated based on the Mie theory and the core-shell model. Our numerical calculations show that this finding is in good agreement with previous experiments. We provide better interpretation for the origin of optical peaks in the absorption spectrum of the nanoparticle complex system. Our results can be used in biomedical applications.
6p
koxih_kothogmih5
04-09-2020
45
1
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