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.

Novel magneto-optical recording materials: Bi-substituted garnet films

1991 ◽  
Vol 49 ◽  
pp. 776-777
Author(s):  
Takao Suzuki ◽  
Hossein Nuri
Keyword(s):  
Grain Size ◽  
Amorphous Film ◽  
Nitrogen Atmosphere ◽  
Optical Recording ◽  
Garnet Film ◽  
Media Noise ◽  
Garnet Films ◽  
Order Of Magnitude ◽  
A New Technique ◽  
A Current

For future high density magneto-optical recording materials, a Bi-substituted garnet film ((BiDy)3(FeGa)5O12) is an attractive candidate since it has strong magneto-optic effect at short wavelengths less than 600 nm. The signal in read back performance at 500 nm using a garnet film can be an order of magnitude higher than a current rare earth-transition metal amorphous film. However, the granularity and surface roughness of such crystalline garnet films are the key to control for minimizing media noise.We have demonstrated a new technique to fabricate a garnet film which has much smaller grain size and smoother surfaces than those annealed in a conventional oven. This method employs a high ramp-up rate annealing (Γ = 50 ~ 100 C/s) in nitrogen atmosphere. Fig.1 shows a typical microstruture of a Bi-susbtituted garnet film deposited by r.f. sputtering and then subsequently crystallized by a rapid thermal annealing technique at Γ = 50 C/s at 650 °C for 2 min. The structure is a single phase of garnet, and a grain size is about 300A.

Electrical Capacitance Volume Tomography (ECVT) for industrial and medical applications-An Overview

2015 ◽  
Vol 11 (1) ◽  
pp. 2897-2908
Author(s):  
Mohammed S.Aljohani
Keyword(s):  
Imaging Technique ◽  
Three Dimensional ◽  
Biological Processes ◽  
Electrical Capacitance ◽  
Image Reconstruction Techniques ◽  
Phase Dynamics ◽  
Non Invasive ◽  
Electrical Capacitance Volume Tomography ◽  
And Performance ◽  
Optimization And Performance

Tomography is a non-invasive, non-intrusive imaging technique allowing the visualization of phase dynamics in industrial and biological processes. This article reviews progress in Electrical Capacitance Volume Tomography (ECVT). ECVT is a direct 3D visualizing technique, unlike three-dimensional imaging, which is based on stacking 2D images to obtain an interpolated 3D image. ECVT has recently matured for real time, non-invasive 3-D monitoring of processes involving materials with strong contrast in dielectric permittivity. In this article, ECVT sensor design, optimization and performance of various sensors seen in literature are summarized. Qualitative Analysis of ECVT image reconstruction techniques has also been presented.

Thermal Behaviour of Candesartan Active substance and in pharmaceutical compounds

2017 ◽  
Vol 68 (8) ◽  
pp. 1895-1902
Author(s):  
Ioana Cristina Tita ◽  
Eleonora Marian ◽  
Bogdan Tita ◽  
Claudia Crina Toma ◽  
Laura Vicas
Keyword(s):  
Thermal Behaviour ◽  
Active Substance ◽  
Pharmaceutical Research ◽  
Pharmaceutical Product ◽  
Nitrogen Atmosphere ◽  
Pure Substance ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Ft Ir

Thermal analysis is one of the most frequently used instrumental techniques in the pharmaceutical research, for the thermal characterization of different materials from solids to semi-solids, which are of pharmaceutical relevance. In this paper, simultaneous thermogravimetry/derivative thermogravimetry (TG/DTG) and differential scanning calorimetry (DSC) were used for characterization of the thermal behaviour of candesartan cilexetil � active substance (C-AS) under dynamic nitrogen atmosphere and nonisothermal conditions, in comparison with pharmaceutical product containing the corresponding active substance. It was observed that the commercial samples showed a different thermal profile than the standard sample, caused by the presence of excipients in the pharmaceutical product and to possible interaction of these with the active substance. The Fourier transformed infrared spectroscopy (FT-IR) and X-ray powder diffraction (XRPD) were used as complementary techniques adequately implement and assist in interpretation of the thermal results. The main conclusion of this comparative study was that the TG/DTG and DSC curves, together with the FT-IR spectra, respectively X-ray difractograms constitute believe data for the discrimination between the pure substance and pharmaceutical forms.

scholarly journals The First-Class, the Familiar and the Forgettable: An analysis of Prime Ministerial performance in New Zealand

2021 ◽  
Author(s):  
◽  
Katherine Smith
Keyword(s):  
New Zealand ◽  
Political Leadership ◽  
The United States ◽  
Public Perceptions ◽  
Prime Ministers ◽  
Political Performance ◽  
Professional Interest ◽  
And Performance ◽  
Current List ◽  
A Current

<p>Within the literature associated with political leadership, scholarship directly focused upon political performance in office is thinly conducted, both in New Zealand and in other areas across the world. This thesis aims to greater understand political leadership and performance in New Zealand, and address the gaps in the literature correlated with Prime Ministerial performance. To do this, this thesis provides a current list of rankings of former Premiers and Prime Ministers in New Zealand and identifies the dimensions that one must fulfil to display exceptional performance in office. To undertake this research, this thesis uses a series of surveys – distributed to students at Victoria University of Wellington, and to other individuals with a professional interest in politics and history in New Zealand – to best assess public perceptions towards political performance. Building upon the path dependency created by former exercises of the same nature in New Zealand (conducted by Simon Sheppard in 1998, and by Jon Johansson and Stephen Levine in 2011), this thesis provides a snapshot of the current public perceptions of outstanding political performance. In a similar nature to the earlier studies, this thesis identifies the dimensions of longevity, death in office, and being a ‘big change’ or crisis Prime Minister as being directly correlated with elevated performance in office. Additionally, this thesis investigates whether a series of variables – namely time between exercises in New Zealand, and the appearance of a possible recency effect– provide any influence or change over results. Additionally, this thesis moves outside the scope of exercises conducted previously in New Zealand, by ranking Prime Ministerial performance using a series of different methodologies. In conjunction with a replication of the exercises already conducted in New Zealand, this survey also assesses Prime Ministerial performance by using a survey based upon the well-cited Schlesinger ranking studies in the United States, and a third survey aimed to assess political shifts and levels of knowledge and recall rates amongst university students. Regardless of such factors, the results of this thesis remain consistent with previous exercises, with Michael Savage, Richard Seddon, Helen Clark and Peter Fraser being regarded by the political and academic elite across all surveys as embodying the highest qualities of successful political leadership in New Zealand.</p>

Introduction

2021 ◽  
pp. xviii-22
Author(s):  
Milija Gluhovic ◽  
Silvija Jestrovic ◽  
Shirin Rai ◽  
Michael Saward
Keyword(s):  
Performance Studies ◽  
Interdisciplinary Approach ◽  
First Century ◽  
Field Of Study ◽  
Political World ◽  
Key Points ◽  
Challenges And Opportunities ◽  
And Performance ◽  
Key Terms ◽  
A Current

Beginning with two vivid examples that illustrate the Handbook’s core arguments—that politics is performative, performance is political, and that both of these matter to understanding our worlds—the introduction provides a current, contextual account of the shared syntax of politics and performance. It defines key terms, such as politics, performance, theatricality, and performativity, that inform the Handbook contributions. Through accessible and provocative engagements with new ways of thinking about politics and performance in both disciplinary and interdisciplinary modes, the introduction shows that these categories are interwoven and entangled in complex and consequential ways. It outlines the states of the art in theater and performance studies and politics, respectively, capturing key points of interconnection between these discourses in order to build on, extend, and reshape interdisciplinary conversations. Finally, it reflects on key challenges and opportunities that attend bringing the two broad fields together for mutual enrichment and building a new, hybrid field of study. Underlining the co-constitutive nature of performance and politics, the introduction suggests that such a framework is critical to promoting an interdisciplinary approach to understanding the complex political world of the twenty-first century.

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.

Low-temperature Pd/FER NOx adsorbers: Operando FT-IR spectroscopy and performance analysis

2021 ◽  
Vol 360 ◽  
pp. 317-325 ◽  
Author(s):  
Lidia Castoldi ◽  
Roberto Matarrese ◽  
Sara Morandi ◽  
Pierfrancesco Ticali ◽  
Luca Lietti
Keyword(s):  
Performance Analysis ◽  
Low Temperature ◽  
Ir Spectroscopy ◽  
Ft Ir ◽  
And Performance ◽  
Ft Ir Spectroscopy

scholarly journals Highly selective self-condensation of cyclohexanone: the distinct catalytic behaviour of HRF5015

2020 ◽  
Vol 7 (10) ◽  
pp. 200123
Author(s):  
Xiujing Peng ◽  
Shah Zeb ◽  
Jianguo Zhao ◽  
Miaomiao Zhang ◽  
Yu Cui ◽  
...  
Keyword(s):  
High Efficiency ◽  
Cluster Structure ◽  
Nitrogen Atmosphere ◽  
Future Application ◽  
Resin Catalyst ◽  
Transmission Electron ◽  
Key Factor ◽  
Good Potential ◽  
Diffuse Reflectance Infrared

HRF5015, a perfluorosulfonic acid resin catalyst with unique pore structures, was investigated in the catalytic self-condensation of cyclohexanone under mild conditions. The morphology of HRF5015 was characterized by transmission electron microscopy (TEM) and atomic force microscope (AFM), and the reaction mechanism was studied by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The effects of reaction time and temperature on the yield of dimer were investigated under the nitrogen atmosphere. The results show that the reaction temperature is low, and especially, the selectivity of the dimer is close to 100%. The apparent activation energy for the dimer formation reaction is 54 kJ mol −1 . Synergistic action of cluster structure formed by sulfonic groups and nanopores in HRF5015 may be the key factor of high-efficiency catalytic activity and high selectivity. In situ infrared spectra indicate that the intermediate is stable in the reaction process. HRF5015 is environmentally friendly and re-usable, which shows good potential in a future application.

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