TẠP CHÍ KHOA HỌC TRƯỜNG ĐHSP HÀ NỘI 2: CHUYÊN SAN KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ
2815-5637
Việt Nam
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The roles of intermediate fluorophores on the optical properties of bottom-up synthesized carbon nanodots
Tập 2 Số 2 - Trang 68-82 - 2023
Carbon nanodots (CNDs) are the latest nano-sized carbon materials having unique properties such as biocompatible, highly photoluminescent, and nontoxic which are suitable for diverse applications including lighting, sensing, bioimaging, and biochemical analyzing. CNDs could be synthesized by top-down methods in which graphite is fragmented into nano-sized graphene dots. Alternatively, CNDs could b......
#Carbon nanodots #Carbon quantum dots #Bottom-up #Fluorophore #Mechanism
Green synthesis of UV absorber (E)-2-(((4-(benzyloxy)phenyl)imino)methyl)phenol by microwave method
Tập 2 Số 2 - Trang 59-67 - 2023
In this work, a UV absorber compound (E)-2-(((4-(benzyloxy)phenyl)imino)methyl)phenol was synthesized by microwave method using a two steps protocol. In the first step, α-(4-hydroxyphenylimino)-o-cresol (1) was synthesized from 4-aminophenol and salicylaldehyde by circulating under microwave heating at 60 oC for 8 minutes, the reaction yield reached 82.91 %. In the second step (E)-2-(((4-(benzylox......
#UV stabilizer #UV absorber #microwave method #green chemistry
The synthesis of TCNQ-based material with derivative of leucine amino
Tập 1 Số 1 - Trang 53-59 - 2022
A new material, Leu(CH3)4-TCNQ, has been successfully synthesized from Tetracyanoquinondimethane (TCNQ) and amino acid ester, N,N,N-Trimethyl-L-Leucine Methyl ester ((Leu(CH3)4+). This material was characterized by modern physicochemical methods such as: X-ray diffraction technique (XRD), Raman, Infrared (FT-IR) and UV-Vis spectroscopy and voltammetric technique. This result will offering a new di......
#TCNQ #material #structure #synthesis #amino acids
Control the solubility of carbon quantum dots by solvent engineering
Tập 2 Số 3 - Trang 51-58 - 2023
Solubility parameters of carbon quantum dots (CQDs) are important physical properties to deploy CQDs in various applications such as organic light emitting diodes (OLEDs), light-converting materials in LEDs, and photoluminescent sensors for metal ion detection. Because of the low toxicity and tunable emission most CQDs have been designed to be water-soluble and biocompatible; oil-soluble CQDs that......
#Carbon quantum dots #solublity parameter #solvent engineering #oil soluble #solvothermal
Taxonomical characteristics of Dysoxylum Blume in Vietnam
Tập 2 Số 1 - Trang 63-67 - 2022
Genus Dysoxylum Blume in Vietnam, the Dysoxylum has 15 species, can be found in primary and secondary forests. All species are trees, some are large trees, with very diverse morphological characteristics; they play an important role in forest ecosystems where they are present and are used for many purposes: for timber, in medicine, 2 species are cultivated, 3 species are threatened with extinction......
Chemical compositions and anti-acetylcholinesterase, nitric oxide suppressing activities of Piper longum fruits oil
Tập 2 Số 1 - Trang 38-45 - 2023
Piper longum fruits oil in Binh Dinh, Vietnam was obtained via steam distillation with oil collection efficiency reaching 1.01%. The chemical compositions of the essential oil from Piper longum fruits in Binh Dinh, Vietnam is determined via the GC-MS method that includes 35 components (99.68%), among which the main components are caryophyllene (10.78%), 3-heptadecene (9.95%), zingiberene (9.54%), ......
#Piper longum oil #Piper longum #steam distillation #anti-acetylcholinesterase #nitric oxide suppressing
The one-pot synthesis of photoluminescent polycarbonate based on the pyrolysis of citrate
Tập 3 Số 1 - Trang 57-63 - 2024
Photoluminescent composites that are air-stable and water-resistant are important for outdoor applications such as road marking paints, light-converting membranes, fluorescent paints, and security inks. Photoluminescent thermoplastics fulfill all conditions but their preparation methods which are vastly based on mixing pre-synthesized fluorescent dyes and plastic could lead to emission quenching d......
#Thermoplastics #extrusion #luminescent #photoluminescent #composite
Antifungal activity of purple amomum (Amomum longiligulare T.L. Wu) plant extracts against Fusarium oxysporum Schlecht. and Helminthosporium sativum P. K. & B.
Tập 1 Số 2 - Trang 52-62 - 2022
Purple amomum (Amomum longiligulare T.L. Wu), which belongs to the monophyletic Zingiberaceae family, is a valuable medicinal plant in Vietnam. The studies on the biological activities of the extracts or essential oils of this species are very limited. So far, there has been no evaluation of the antifungal activity of purple amomum extracts. Fusarium oxysporum Schlecht. and Helminthosporium sativu......
Investigation of structural and electronic properties of ZnO using first principle calculations
Tập 3 Số 1 - Trang 78-87 - 2024
In this research, first-principle calculations have been performed to study the geometry structure and electronic properties of ZnO. All possible exchange-correlation energy functionals were used to perform geometry optimization of ZnO in order to find the efficient calculation conditions. Bandgap energy, density of states (DOS), projected DOS (PDOS); and other properties of ZnO were also calculat......
#ZnO #DFT #pseudopotential #Hubbard potential #electronic structure
Viscosity solutions of the augmented K- Hessian equations
Tập 1 Số 1 - Trang 3-9 - 2022
In this paper, the Dirichlet problem for the augmented k – Hessian equations in the bounded domain with nonsmooth data will be investigated. We introduce the concept of (w,k) – convex function, show that all viscosity subsolutions and supersolutions of the considering Dirichlet problem are (w,k) – convex. Furthermore, we prove some sufficient conditions for the existence and uniqueness of the visc......
#Augmented k - Hessian equations #viscosity solutions