scholarly journals A Comprehensive Experiment on the Synthesis and Performance of Carbon Nitride Photocatalyst Modified by Copolymerization

2021 ◽  
Vol 2109 (1) ◽  
pp. 012010
Author(s):  
Dandan Zheng ◽  
Yixin Li
Keyword(s):  
Physical Chemistry ◽  
Analytical Chemistry ◽  
Scientific Literacy ◽  
Material Characterization ◽  
Carbon Nitride ◽  
Materials Chemistry ◽  
Water Decomposition ◽  
Experimental Operation ◽  
Ft Ir ◽  
And Performance

Abstract Based on cutting-edge topics and research foundation, a comprehensive experiment on the preparation and performance of a copolymerization modified carbon nitride (g-CN) photocatalyst was designed. This experiment involved the preparation of g-CN photocatalytic materials, the basic experimental operation of photocatalytic water decomposition, the use of material characterization instruments such as FT-IR, DRS and PL, as well as the processing and analysis of origin data. It covers knowledge of physical chemistry, analytical chemistry, instrumental analysis and materials chemistry. The comprehensive innovation experiment is beneficial to expand students’ knowledge and cultivate students’ innovation consciousness, exploration spirit, and scientific literacy.

Mesoporous Nitrides through Nano-Hard Templating Techniques

2007 ◽  
Vol 119 ◽  
pp. 291-294
Author(s):  
Ajayan Vinu ◽  
Srinivasan Anandan ◽  
Narasimhan Gokularkrishnan ◽  
Pavuluri Srinivasu ◽  
Toshiyuki Mori ◽  
...  
Keyword(s):  
Mesoporous Carbon ◽  
Carbon Nitride ◽  
Pore Filling ◽  
Ft Ir ◽  
Textural Parameters ◽  
Catalytic Supports ◽  
Boron Carbon Nitride ◽  
Mesoporous Carbon Nitride ◽  
Carbon Nitride Materials ◽  
Boron Carbon

Mesoporous carbon nitride materials have been synthesized using SBA-15 by pore filling technique whereas mesoporous boron nitride and boron carbon nitride have been prepared by elemental substitution technique using mesoporous carbon as template. The obtained materials have been unambiguously characterized by sophisticated techniques such as XRD, HRTEM, EELS, XPS, FT-IR and N2 adsorption. The textural parameters of the materials are quite higher as compared to the respective nonporous nitrides. These materials could offer great potential for the applications, such as catalytic supports, gas storage, biomolecule adsorption and drug delivery.

scholarly journals Structural Investigations on Poly(methyl methacrylate) Various Composites Used for Stereolithographyc Complete Dentures

2018 ◽  
Vol 55 (4) ◽  
pp. 616-619 ◽  
Author(s):  
Eugenia Eftimie Totu ◽  
Corina Marilena Cristache ◽  
Selim Isildak ◽  
Ozlem Tavukcuoglu ◽  
Aida Pantazi ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Material Characterization ◽  
Polymeric Matrix ◽  
Structural Behavior ◽  
Oxide Nanoparticles ◽  
Complete Dentures ◽  
Titanium Oxide Nanoparticles ◽  
Structural Investigations ◽  
Ft Ir ◽  
Microscopy Techniques

The present paper is focused on analyzing if appropriate adhesion between the polymeric matrix and titania filler nanoparticles is obtained for the PMMA-TiO2 photo-curable dental material, suitable for application in RP - stereolithography (SLA) for complete denture manufacturing. It was found that different amounts, between 0.2% and 2.5 % (w/w%), of added titanium oxide nanoparticles slightly modify the structural behavior of the PMMA polymeric matrix. The material characterization was carried out using FT-IR and microscopy techniques.

Material Characterization Of Methyl Siloxane Sogs

1995 ◽  
Vol 381 ◽  
Author(s):  
Ken Numata ◽  
Thomas R. Seha ◽  
Shin-Puu Jeng ◽  
Tsuyoshi Tanaka
Keyword(s):  
Material Characterization ◽  
Interesting Property ◽  
Moisture Resistance ◽  
Filling Material ◽  
Number Density ◽  
Gap Filling ◽  
Leakage Currents ◽  
Ft Ir ◽  
Low Permittivity

AbstractMethyl siloxane spin-on-glass (SOG) is a conventional gap-filling material. In accordance with the requirement of low permittivity, many of major SOG suppliers are developing new types of methyl siloxane SOGs.The most interesting property of these SOGs is their permittivity, which we measured by making stack structures of Al-0.5%Cu / TEOS CVD SiO2 / SOG / n+ Si. We also studied I-V characteristics, refractive indices, FT-IR spectra, stress, and moisture resistance.All of the SOGs showed small stress and fair moisture resistance. Leakage currents were less than 2.5E-10 A/cm2 for bias voltages up to 5V. Permittivities ranged from 2.9 to 3.6. We observed a correlation between permittivity and FT-IR spectral features associated with Si-O-Si bonds. Reducing the number density of Si-O-Si bonds may be an effective way to lower the permittivity of this class of SOGs

Studies of Iron-Doped Carbon Material from Carbonization of Soy Protein/Polyaniline Composite and its Electrical Capacitance

2020 ◽  
Vol 999 ◽  
pp. 13-20
Author(s):  
Qing Wu Zhang ◽  
Tian Fang ◽  
Hao Lu ◽  
Wei Wang ◽  
Qing Qing Zhang ◽  
...  
Keyword(s):  
Carbon Material ◽  
Nitrogen Atmosphere ◽  
Electrical Capacitance ◽  
Protein Gel ◽  
Solution Energy ◽  
Iron Doped ◽  
Good Potential ◽  
Ft Ir ◽  
And Performance ◽  
A Current

Protein gel of soy was formed immediately during polymerization of aniline initiated by certain amount of FeCl3. In order to obtain iron-doped carbon material, this composite was then carbonized at 700°C under nitrogen atmosphere for 5h. SEM, FT-IR, XRD, and isothermal desorption/adsorption technologies were employed to characterize morphology and structure of the material. Electrical capacitance of iron-doped carbon materials and performance of a prototype supercapacitor based on the material as its electrodes were measured by cyclic voltammetry, chronopotentiometry, and A.C. impedance respectively. Results show that morphology of as-obtained material is porous and hierachical, specific surface area of the material is 232.1m2/g, and specific capacitance of the material can reach 475.2F/g in 6 M KOH aqueous solution. Energy density and power density of the cell is 2.1Wh/kg and 2.0kW/kg, respectively. Capacity retention of the device is 100% after 5000 cycles at a current density of 2A/g. The above studies imply that this original iron-doped carbon material will have a good potential application in field of energy storage.

A review: metamaterial sensors for material characterization

Sensor Review ◽  
2019 ◽  
Vol 39 (3) ◽  
pp. 417-432 ◽  
Author(s):  
A. Vivek ◽  
K. Shambavi ◽  
Zachariah C. Alex
Keyword(s):  
Material Characterization ◽  
Research Work ◽  
Wave Interaction ◽  
High Sensitivity ◽  
Electromagnetic Spectrum ◽  
Label Free ◽  
Content Type ◽  
Work Related ◽  
Sensing Application ◽  
And Performance

Purpose This paper aims to focus on research work related to metamaterial-based sensors for material characterization that have been developed for past ten years. A decade of research on metamaterial for sensing application has led to the advancement of compact and improved sensors. Design/methodology/approach In this study, relevant research papers on metamaterial sensors for material characterization published in reputed journals during the period 2007-2018 were reviewed, particularly focusing on shape, size and nature of materials characterized. Each sensor with its design and performance parameters have been summarized and discussed here. Findings As metamaterial structures are excited by electromagnetic wave interaction, sensing application throughout electromagnetic spectrum is possible. Recent advancement in fabrication techniques and improvement in metamaterial structures have led to the development of compact, label free and reversible sensors with high sensitivity. Originality/value The paper provides useful information on the development of metamaterial sensors for material characterization.

The Synthesis, Characterization and Visible-Light Photodegradation Performance of Graphitic Carbon Nitride Coupling with CoAPO-5

2018 ◽  
Vol 281 ◽  
pp. 878-884
Author(s):  
Zhi Wei Zhou ◽  
Ling Fang Qiu ◽  
Xiao Bin Qiu ◽  
Shu Wang Duo
Keyword(s):  
Visible Light ◽  
Carbon Nitride ◽  
Diffuse Reflectance Spectroscopy ◽  
Light Illumination ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Grinding Method ◽  
Visible Light Illumination ◽  
Ft Ir

In order to enhance hole/electron separation and charge transfer in photocatalysts, the heterostructured g-C3N4/CoAPO-5 hybrids materials were synthesized via a simple grinding method and were investigated using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The optical properties of g-C3N4/CoAPO-5 hybrids materials were measured by ultraviolet-visible diffuse-reflectance spectroscopy (DRS), photoluminescence (PL) spectra and ultraviolet-visible absorption (UV-Vis) spectra. Under visible-light illumination, this work shows the heterogeneous g-C3N4/CoAPO-5 hybrids present a superior photocatalytic activity.

scholarly journals Demethylation of Alkali Lignin with Halogen Acids and Its Application to Phenolic Resins

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1771 ◽  
Author(s):  
Hao Wang ◽  
Thomas L. Eberhardt ◽  
Chunpeng Wang ◽  
Shishuai Gao ◽  
Hui Pan
Keyword(s):  
1H Nmr ◽  
Nucleophilic Reagent ◽  
2D Nmr ◽  
Hydroxyl Groups ◽  
Chemical Processing ◽  
Hydroxyl Content ◽  
Phenolic Resins ◽  
Alkali Lignin ◽  
Ft Ir ◽  
And Performance

Lignin, a byproduct from the chemical processing of lignocellulosic biomass, is a polyphenolic compound that has potential as a partial phenol substitute in phenolic adhesive formulations. In this study, HBr and HI were used as reagents to demethylate an alkali lignin (AL) to increase its hydroxyl content and thereby enhance its reactivity for the preparation of phenolic resins. Analyses by FT-IR, 1H-NMR and 2D-NMR(HSQC) demonstrated both a decrease in methoxyl groups and an increase in hydroxyl groups for each demethylated lignin (DL). In addition, the molar amounts of phenolic hydroxyls, determined by 1H-NMR, increased to 0.67 mmol/g for the HI-DL, and 0.64 mmol/g for the HBr-DL, from 0.52 mmol/g for the AL. These results showed that HI, a stronger nucleophilic reagent than HBr, provided a higher degree of AL demethylation. Lignin-containing resins, prepared by copolymerization, met the bonding strength standard for exterior plywood with DL used to replace as much as 50 wt.% of phenol. The increased hydroxyl contents resulting from the lignin demethylations also imparted faster cure times for the lignin-containing resins and lower formaldehyde emissions. Altogether, the stronger nucleophilicity of HI, compared to HBr, impacted the degree of lignin demethylation, and carried through to measurable differences the thermal properties and performance of the lignin-containing PF resins.

scholarly journals Preparation, Characterization, and Performance Analysis of S-Doped Bi2MoO6 Nanosheets

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1341 ◽  
Author(s):  
Ruiqi Wang ◽  
Duanyang Li ◽  
Hailong Wang ◽  
Chenglun Liu ◽  
Longjun Xu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Degradation Rate ◽  
X Ray Diffraction ◽  
Photo Degradation ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir ◽  
And Performance ◽  
Adsorption Desorption ◽  
Excellent Stability

S-doped Bi2MoO6 nanosheets were successfully synthesized by a simple hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), N2 adsorption–desorption isotherms, Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), elemental mapping spectroscopy, photoluminescence spectra (PL), X-ray photoelectron spectroscopy (XPS), and UV-visible diffused reflectance spectra (UV-vis DRS). The photo-electrochemical performance of the samples was investigated via an electrochemical workstation. The S-doped Bi2MoO6 nanosheets exhibited enhanced photocatalytic activity under visible light irradiation. The photo-degradation rate of Rhodamine B (RhB) by S-doped Bi2MoO6 (1 wt%) reached 97% after 60 min, which was higher than that of the pure Bi2MoO6 and other S-doped products. The degradation rate of the recovered S-doped Bi2MoO6 (1 wt%) was still nearly 90% in the third cycle, indicating an excellent stability of the catalyst. The radical-capture experiments confirmed that superoxide radicals (·O2−) and holes (h+) were the main active substances in the photocatalytic degradation of RhB by S-doped Bi2MoO6.

Synthesis and Performance of Dopa-Modified Multiwalled Carbon Nanotubes

2012 ◽  
Vol 184-185 ◽  
pp. 1289-1293
Author(s):  
Lu Zhi Wang ◽  
Lin Yu ◽  
Xiao Ling Cheng ◽  
Jun He ◽  
Le Jia Lin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Multiwalled Carbon ◽  
X Ray ◽  
Multiwalled Nanotubes ◽  
Mixed Acid ◽  
Transmission Electron ◽  
Ft Ir ◽  
And Performance

The Dopamine-modified multiwalled carbon nanotubes (MWNT-Dopa) were synthesized by chemical reaction between dopamine (Dopa) and multiwalled carbon nanotubes which oxidazed by mixed-acid (MWNT-COOH). The structure of MWNT-Dopa were analyzed by Fourier transform infrared spectroscopy (FT-IR), Thermogravimetric (TG), Transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) techniques and the dispersity of MWNT-Dopa were studied by Dispersion stability analyzer. The results show that dopamine has been grafted on multiwalled carbon nanotubes successfully, and a dopamine layer which wraps on the surface of multiwalled nanotubes make multiwalled nanotubes have outstanding dispersity in water.

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