Danh mục

Spectroscopy

Self-healing performance of vulcanized natural rubber using MgO/ZnO as a binary activator

Self-healing performance of vulcanized natural rubber using MgO/ZnO as a binary activator

Self-healing vulcanized natural rubber (V-NR) was prepared with MgO/ZnO as a binary activator system in the study. Standard Vietnam Rubber Grade 3L (SVR3L) was used as NR source. The SVR3L was vulcanized with ZnO, MgO/ZnO, or MgO as activators and other vulcanizing reagents.
9 trang
13 lượt xem
1 lượt tải
Effect of calcination temperature and doping ions concentration on optical properties of YPO4:Tb3+

Effect of calcination temperature and doping ions concentration on optical properties of YPO4:Tb3+

In this study, we synthesized YPO4:x%Tb3+ using the combustion synthesis method and investigated the effects of annealing temperature and dopant concentration on the structural, morphological, and optical properties of the material.
8 trang
14 lượt xem
1 lượt tải
Synthesis and evaluation of the acetylcholinesterase inhibitory effect of novel heteroaromatic derivatives bearing a 2-(5-(pyridin-2-yl)-1H-tetrazol-1-yl)acetamide scaffold

Synthesis and evaluation of the acetylcholinesterase inhibitory effect of novel heteroaromatic derivatives bearing a 2-(5-(pyridin-2-yl)-1H-tetrazol-1-yl)acetamide scaffold

Acetylcholinesterase (AChE) has been one of the important and potential targets in the discovery, and development of new drugs for treating and slowing the progression of Alzheimer's disease (AD). This research suggests potential structural frameworks for synthesizing AChE inhibitor derivatives for treating AD.
11 trang
8 lượt xem
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Fabrication and characterization of chitosan-gelatin composite film

Fabrication and characterization of chitosan-gelatin composite film

Recent research is focusing on the development of bio-packaging materials by mixing different polymers to enhance the bonding strength within the matrix and combining favorable properties of the constituent materials. This work developed a bio-packaging material by combining chitosan, gelatin, and glycerol.
10 trang
9 lượt xem
2 lượt tải
The photothermal effect of gold nanoparticles prepared by electrochemical method at different voltages

The photothermal effect of gold nanoparticles prepared by electrochemical method at different voltages

This paper was performed to evaluate the photothermal effect of pure gold nanoparticles (Au NPs) prepared by electrochemical method at different voltages, under laser irradiation in the safe wavelength range. The formation, morphological, and structural properties of Au NPs were analyzed by UV-Vis absorption spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD).
11 trang
13 lượt xem
1 lượt tải
Structural properties of a sol-gel generated BiFeO3 and its photocatalytic activity

Structural properties of a sol-gel generated BiFeO3 and its photocatalytic activity

BiFeO3 (BFO) was synthesized using a combustion sol-gel method from reactants of Bi(NO3)3.5H2O and Fe(NO3)3.9H2O with various complexation reagents. The absorbance and photocatalytic activity of BFO on Methylene Blue (MB) decomposition were studied using infrared (IR) and UV-Vis spectroscopy.
10 trang
5 lượt xem
2 lượt tải
Treatment of malachite green in aqueous solution using chitosan/pectin/SiO2 composite

Treatment of malachite green in aqueous solution using chitosan/pectin/SiO2 composite

n this work, pectin was extracted from pomelo peel while rice husk ash was used for silica recovery. The obtained CPS were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Field emission scanning electron microscopy (FE-SEM).
8 trang
8 lượt xem
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Photocatalytic properties of ZnO/CuO/Ag ternary composites

Photocatalytic properties of ZnO/CuO/Ag ternary composites

In this paper, ZnO/CuO/Ag ternary composites were successfully synthesized by hydrothermal method using Zn(NO3)2.6H2O, Cu(NO3)2.3H2O and AgNO3. The composite samples were characterized using X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Raman spectroscopy.
8 trang
7 lượt xem
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Synthesis and CO gas adsorption properties of GO/ZnFe2O4 nanocomposites

Synthesis and CO gas adsorption properties of GO/ZnFe2O4 nanocomposites

In this work, ZnFe2O4 nanoparticles were synthesized by hydrothermal method while the hummer method was used to synthesize GO nanosheet. GO/ZnFe2O4 nanocomposites (GO/ZFO) were prepared by mixing GO with ZnFe2O4 in mass ratio of 1:99, respectively.
8 trang
14 lượt xem
2 lượt tải
Synthesis and characterization of lanthanum-doped cobalt ferrite nanoparticles prepared via simple co-precipitation

Synthesis and characterization of lanthanum-doped cobalt ferrite nanoparticles prepared via simple co-precipitation

In this study, spinel ferrite nanoparticles CoFe2-xLaxO4 (x = 0, 0.025, and 0.05) were successfully synthesized via a simple co-precipitation method using a 5% NaOH solution as a precipitating agent. The physicochemical properties of the materials, annealed at 850 °C for one hour, were characterized using powder X-ray diffraction (PXRD), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), and vibrating-sample magnetometry (VSM) at room temperature.
10 trang
7 lượt xem
1 lượt tải
Master's thesis of Engineering: Electrical impedance spectroscopy applied in plant physiology studies

Master's thesis of Engineering: Electrical impedance spectroscopy applied in plant physiology studies

This dissertation aims to investigate the electrical impedance properties of fruits and vegetables, and explore the relationship between impedance and quality criteria. In particular, the present dissertation outlines experimental research conducted on relationships between impedance properties and fruit tastes as well as the impedance changes observed during ripening process. Impedance measurement to monitor moisture content changes in the progress of drying is also included in this research.
116 trang
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Master's thesis of Engineering: Optical spectroscopy characterization of nano-scale photonic structures

Master's thesis of Engineering: Optical spectroscopy characterization of nano-scale photonic structures

The focus of this study is to investigate its optical and conductive properties under different conditions of doping environments, temperature and polymerization conditions. Optical characterization technique such as UV-Visible spectroscopy is developed to carry out the investigation. The developed nanofibers have been demonstrated to possess optical and conductive properties to be dependent on doping variables. Study of these optical properties could prove very useful in the development of electrochromic devices and gas sensors.
103 trang
20 lượt xem
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Master's thesis of Engineering: Preparation of Clay-dye pigment and its dispersion in polymers

Master's thesis of Engineering: Preparation of Clay-dye pigment and its dispersion in polymers

The objectives of this research work are: Study the clay intercalation by organic dye and develop a process to produce nanoclay-dye pigment with better stability and good performance; Conduct structural characterization to verify the level of intercalation and stability of clay-dye pigment by using X-Ray diffraction (XRD) and Transmission Electron Microscopy (TEM); Investigate the thermal stability of clay dye pigment using Thermo Gravimetric Analysis (TGA) to reveal the effect of dye intercalation into the clay on improving thermal stability of organic dye; Compound the clay- pigment with polymer and examine the effect of clay-dye pigment on the thermal and UV stability of pigmented polymer clay nanocomposites.
141 trang
12 lượt xem
3 lượt tải
Master's thesis of Applied Science (Applied Physics): Muon interaction with lead shielding producing activation: implications for gamma-ray spectrometry

Master's thesis of Applied Science (Applied Physics): Muon interaction with lead shielding producing activation: implications for gamma-ray spectrometry

This work investigates the generation of neutron flux inside lead shielding due to cosmic rays as a function of shielding thickness by use of the GEANT Monte-Carlo modelling code. GEANT allows for the Monte-Carlo modelling of the transport of particles in matter. This includes muons, the particles of interest here, which originate from cosmic ray showers.
109 trang
17 lượt xem
3 lượt tải
Positron annihilation spectroscopy study of lattice defects in non-irradiated doped and un-doped fuels

Positron annihilation spectroscopy study of lattice defects in non-irradiated doped and un-doped fuels

In this study, we investigated the microstructure of such doped fuels as well as a reference standard UO2 by positron annihilation spectroscopy (PAS). Although this technique is particularly sensitive to lattice point defects in materials, a wider application in the UO2 research is still missing.
5 trang
8 lượt xem
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How to produce accurate inelastic cross sections from an indirect measurement method?

How to produce accurate inelastic cross sections from an indirect measurement method?

In this article, we will first discuss the issues of the prompt g-ray spectroscopy regarding the control of all the uncertainties involved in the (n,n0g) cross section estimation. Secondly, we will focus on the role of theoretical modeling which, in certain cases, is crucial to reach the objectives of a few percent uncertainty on the (n,n0) cross sections.
9 trang
10 lượt xem
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Quantum mechanical and electrochemical investigations on corrosion inhibition properties of novel heterocyclic Schiff bases

Quantum mechanical and electrochemical investigations on corrosion inhibition properties of novel heterocyclic Schiff bases

The corrosion inhibition efficiencies of two novel Schiff bases, namely (E)-3-[thiophen-2-lmethyleneamino]benzoic acid (T2YMABA) and (E)-4-(5-[(2-phenylhydrazono) methyl]thiophen-2-yl)benzoic acid (PHMT2YBA) on mild steel (MS) in 1.0M HCl solution has been investigated and compared using electrochemical impedance spectroscopy and potentiodynamic polarization analysis.
10 trang
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Magnetically recoverable CuFe2O4 nanoparticles as an efficient heterogeneous catalyst for green formylation of alcohols

Magnetically recoverable CuFe2O4 nanoparticles as an efficient heterogeneous catalyst for green formylation of alcohols

In this article, magnetically nanoparticles (MNPs) of CuFe2O4 were prepared and characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction and transmission electron microscopy techniques.
10 trang
30 lượt xem
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5-[Substituted]-1, 3, 4-thiadiazol-2-amines: Synthesis, Spectral Characterization, and Evaluation of their DNA interactions

5-[Substituted]-1, 3, 4-thiadiazol-2-amines: Synthesis, Spectral Characterization, and Evaluation of their DNA interactions

The presence of heterocyclic moiety in diverse compounds, strongly indicative of the desired effect on physiological activity, and it reflects on efforts to find useful synthetic drugs.
12 trang
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Bài thuyết trình Vật lý ứng dụng: Matrix-Isolation Raman Spectroscopy

Bài thuyết trình Vật lý ứng dụng: Matrix-Isolation Raman Spectroscopy

Bài thuyết trình Vật lý ứng dụng: Matrix-Isolation Raman Spectroscopy đưa ra lịch sử, nguyên lý, thiết bị và ứng dụng của kỹ thuật MI (Matrix-Isolation). Mời các bạn tham khảo bài thuyết trình để hiểu rõ hơn về những nội dung này.
18 trang
77 lượt xem
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Giấy phép Mạng Xã Hội số: 670/GP-BTTTT cấp ngày 30/11/2015