Synthesis method
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Ten new chromone derivatives were synthesized from the original 2-4-6- trihydroxyacetophenone using microwave irradiation. The product's structures were confirmed by FT-IR, 1H-NMR, and 13C-NMR spectra data. The anti-microbial activities of the obtained compounds were tested by the disc diffusion method. The results showed that most chromones have significant biological activities against Candida albicans.
10p viambani 18-06-2024 1 0 Download
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An efficient method for the synthesis of 1,2-disubstituted benzimidazoles has been developed from 1,2‐diaminobenzenes and aldehydes using 1-butyl-3-methylimidazolium ([Bmim]BF4) as a catalyst under solvent-free conditions.
7p viambani 18-06-2024 4 1 Download
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The article uses the method of collecting secondary documents combined with the use of synthesis, system, and analysis methods to clarify the theoretical basis of digital transformation in tax management. On that basis, evaluate the current situation of digital transformation, the situation of digital transformation in general in Vietnam and digital transformation in tax administration in our country today. In light of this, we offer a few proposals for advancing the current digital transformation of tax administration in Vietnam today
14p leminhvu111 07-06-2024 0 0 Download
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In this paper, imidazole-based ionic liquids were synthesized by alkylation of imidazole derivatives using 1-bromohexadecane. The anti-corrosion properties of the material were evaluated using the weight method and potentiodynamic polarization method. Results showed that the synthesized ILs are good corrosion inhibitor for CT3 steel.
7p viambani 18-06-2024 3 1 Download
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The process of synthesizing materials by sonochemical method depends on factors such as reaction rate, reaction concentration, reaction power, reaction time, etc. In this study, we investigate the influence of the above factors on the synthesis of materials by sonochemical method.
8p viambani 18-06-2024 2 1 Download
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In this paper, we report a simple and fast method to produce uniform nano-sized Ag particles that can be dispersed in the oil phase by using oleic acid as solvent and capping agent. Oleylamine, a longchain amine that can act as an electron donor at elevated temperatures and is miscible with oleic acid, was selected as a reductant.
6p viambani 18-06-2024 1 1 Download
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In this study, Taguchi's experimental design method was used to improve the yield of FOX-7. Verification of the results shows that the optimal synthesis parameters are as follows: the molar ratio of HNO3/MPD is 8, the reaction time is 180 minutes, and the reaction temperature is 15°C; the maximum yield of FOX-7 can reach 79.14%.
8p viambani 18-06-2024 1 1 Download
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The paper "Fostering entrepreneurial intentions in the culinary sector among youth in the southern region of Vietnam" presents a research model investigating the influence of five factors on entrepreneurial intention within the culinary sector among young individuals in the Southern region of Vietnam. This is achieved through the synthesis of theoretical methods and a review of reputable literature. The factors include attitudes toward entrepreneurial behavior, subjective norms, perceived behavior control, educational environment, and financial accessibility.
8p tonhiemm 07-06-2024 4 1 Download
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Synthesis and characterization of PVP coated gadolinium oxide nanoparticles for imaging applications
In this study, polyol method is used to study the fabrication of Gd2O3 nanoparticles for MRI and CT imaging applications. The obtained Gd2O3 nanoparticle surfaces were then encapsulated with polyvinylpyrrolidone (PVP) polymer as a bio-responsive shell.
10p viamancio 04-06-2024 0 0 Download
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In this study, we fabricated α-Fe2O3 materials via a facile hydrothermal route to use as the active material for the anode of an iron-based battery. The particle size of α-Fe2O3 was in a range of a few hundreds of nanometers to a few micrometers.
10p viamancio 04-06-2024 3 0 Download
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Ebook "Biomedical nanotechnology: Methods and protocols" is to provide an overview of biomedical nanotechnology, from the conception of novel materials in the laboratory to the application of such structures in the clinic. After a brief introductory chapter, the first section consists of protocol chapters which provide practical information on the synthesis of a variety of solution-phase and surface-bound nanomaterials and their application in sensing, imaging, and/or therapeutics; most chapters provide step-by-step instructions and insight into overcoming possible pitfalls and challenges.
447p dongmelo 27-05-2024 3 2 Download
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According to the batch experiments, the adsorption isotherms and the adsorption kinetics for these mesoporous materials are well fitted with the nonlinear Langmuir model and the nonlinear pseudo-second-order model, respectively. Among them, CuFe2O4 powder showed the best phosphate adsorption performance with the maximum P adsorption capacity of 27.49 mgP g-1 , which can be assigned to the highest surface area and the high pH value at its point of zero charge.
7p dianmotminh02 03-05-2024 6 1 Download
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In this work, Al-doped ZnO and Fe-doped ZnO nanoparticles have been synthesized through the coprecipitationannealing method to create new and safer UV filters for sunscreen. The effects of metal doping on phase composition, crystal structure, surface morphology, specific surface area, and elemental composition were characterized by X-ray diffraction, Raman spectroscopy, field emission electron scanning microscopy, nitrogen adsorption-desorption experiments and energy-dispersive X-ray spectroscopy, respectively.
8p dianmotminh02 03-05-2024 2 1 Download
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TiO2 has strong photocatalytic activity, which can oxidize and decompose impurities on surfaces and in the air. Therefore, TiO2 is used as an additive in the self-cleaning coating and paint industries. In this work, SiO2 is used in the TiO2/SiO2 mixture as the nucleus to homogenize the dispersion components. TiO2 and SiO2 nanoparticles are synthesized by the sol-gel method combined with ultrasound that suits the size range of 10-30 nm.
14p dianmotminh02 03-05-2024 2 1 Download
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In this study, a facile synthesis and grafting method is reported for tetradentate Cu(II) Schiff base complex onto the surface of graphene oxide (GO). The Schiff base Cu-complex was synthesized through the condensation reaction between 2,3-diamino pyridine and 2-hydroxy-1-naphthaldehyde, followed by the addition of Cu(II) ion to afford N2O2-Cu(II) complex.
17p dianmotminh02 03-05-2024 3 1 Download
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In this study, cellulose was first treated with 4-cyano-4-((phenyl carbonothioyl)solfanyl) pentanoic acid to serve as the reversible addition-fragmentation chain transfer polymerization (RAFT) agent, then the controlled grafting polymerization of acrylic acid was successfully performed.
8p dianmotminh02 03-05-2024 2 1 Download
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CuO nanoparticles were synthesized by alcohol-assisted hydrothermal method at various pH values, using sodium hydroxide as a precursor for pH control. The chemical composition, morphological and structural properties of the obtained CuO nanoparticles were investigated by the Raman and energy-dispersive X-ray spectroscopies, the field-emission scanning electron microscopy, and the X-ray diffraction.
12p dianmotminh02 03-05-2024 2 1 Download
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The highest luminescence product consists of spheroidal and relatively uniform particles with sizes around 0.6-1.0 µm. The variation of the precipitated precursor with temperature, the influence of sintering temperature on structure and luminescence, the mineralization role of boric acid and the chemical reactions that occur with generation of precipitated precursors and upon heating to give luminescent solid solution products are mentioned.
10p dianmotminh02 03-05-2024 2 1 Download
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This paper reported the synthesis of MOF based on Cu and H3BTC by potentiodynamic method, with emphasis on the effect of the solvent’s nature on the morphology, structure and specific surface area of the obtained material. The CO2 adsorption performance of the obtained MOF was also assessed.
10p dianmotminh02 03-05-2024 2 1 Download
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A series of chalcone analogues were synthesized using Claisen-Schmidt condensation and assayed for in vitro inhibitory activity against α-glucosidase. The synthesis involved in solvent-free reaction conditions including NaOHcatalyzed grinding or microwave irradiation in the presence of a clay-based catalyst. Hydroxychalcones and 2′-hydroxychalcones were not isolated when using grinding method, while the microwave-assisted, clay-catalyzed synthesis gave these desired products. In addition, flavanones, cyclization products from 2′-hydroxychalcones were formed in both methods.
8p dianmotminh02 03-05-2024 5 1 Download