Synthesis and Characterization of Novel Vanadium Dioxide Nanorods

2003 ◽  
Vol 788 ◽  
Author(s):  
Wen Chen ◽  
Liqiang Mai ◽  
congsheng Jiang ◽  
Junfeng Peng ◽  
Qing Xu ◽  
...  
Keyword(s):  
Vanadium Dioxide ◽  
Raw Materials ◽  
Large Fraction ◽  
Hydrothermal Process ◽  
Hydrothermal Condition ◽  
Redox Titration ◽  
Functionalized Materials ◽  
Hrtem Micrographs ◽  
First Time

ABSTRACTVanadium dioxide nanorods (B phase) have been synthesized, for the first time, using cetyltrimethylammonium bromide (CTAB) as structure-directing template in hydrothermal condition. Morphology and structure of the sample were characterized by XRD, SEM, HRTEM, XPS, TG-DTA and redox titration. The results show that the products are VO2 (B) nanorods and they are 1∼2 μm in length. HRTEM micrographs reveal that they indeed form bundles of agglomerated smaller filaments with diameters ranging from 20 to 40 nm. This filament-like shape in the nanoscale dimension leads to the exposure of a large fraction of the atoms to the surface. Thus, these materials are promising candidates for the development of new functionalized materials. TG investigation shows that there are a weight loss of 2.21 % between 250∼400 °C corresponding to removal of the organic residuals and a weight gain at about 430 °C corresponding to oxidation of vanadium with low oxidation state. The simplicity of hydrothermal process, cheapness, and availability of raw materials are advantages favoring the scaling-up of nanorods.

LOW-COST SYNTHESIS OF NOVEL VANADIUM DIOXIDE NANORODS

2004 ◽  
Vol 03 (03) ◽  
pp. 225-231 ◽  
Author(s):  
LIQIANG MAI ◽  
WEN CHEN ◽  
QING XU ◽  
JUNFENG PENG ◽  
QUANYAO ZHU
Keyword(s):  
Vanadium Dioxide ◽  
Raw Materials ◽  
Low Cost ◽  
Large Fraction ◽  
Sol Gel ◽  
Hydrothermal Process ◽  
Ammonium Bromide ◽  
Redox Titration ◽  
Functionalized Materials ◽  
Cetyltrimethyl Ammonium

The synthesis of novel vanadium dioxide nanorods has been achieved by using V 2 O 5 and cetyltrimethyl ammonium bromide (CTAB) in a sol–gel reaction followed by hydrothermal treatment. Morphology and structure of the sample as well as vanadium oxidation state were characterized by XRD, SEM, HRTEM, ESR, XPS and redox titration. The results show that the products are monoclinic (C/2m) B phase VO 2 nanorods and they are 1~2 μm in length. HRTEM micrographs reveal that they indeed form bundles of agglomerated smaller filaments with diameters ranging from 20 to 40 nm besides single nanorod. This filament-like shape in the nanoscale dimension leads to the exposure of a large fraction of the atoms to the surface. Thus, these materials are promising candidates for the development of new functionalized materials. CTAB not only generates a reducing atmosphere, but also plays a key role in the growth of the nanorods. The simplicity of hydrothermal process, as well as cheapness and availability of raw materials are advantages of this method.

Synthesis and Characterization of Novel Isonicotinate-Based Ionic Liquids

2011 ◽  
Vol 233-235 ◽  
pp. 1266-1269 ◽  
Author(s):  
Cheng Ping Miao ◽  
Qian Shou Zong ◽  
Zi Wei Xiang ◽  
Jian Yi Wu
Keyword(s):  
Ionic Liquids ◽  
Isonicotinic Acid ◽  
Raw Materials ◽  
Synthesis And Characterization ◽  
First Time

Novel esteryl-functionalized ionic liquids from isonicotinic acid as raw materials have been designed, synthesized, and characterized for the first time.

Characterization of NiFe2O4 nanoparticles synthesized by various methods

2009 ◽  
Vol 63 (4) ◽  
Author(s):  
Hüseyin Kavas ◽  
Nermin Kasapoğlu ◽  
Abdülhadi Baykal ◽  
Yüksel Köseoğlu
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Process ◽  
Synthesis Method ◽  
Uncoated Sample ◽  
Spin Resonance ◽  
Nife2o4 Nanoparticles ◽  
Sample Method ◽  
First Time ◽  
Hydrothermal Methods

AbstractMicrowave-induced combustion with glycine, CTAB-assisted hydrothermal process with NaOH and NH3, EDTA assisted-hydrothermal methods have been applied to prepare NiFe2O4 nanoparticles for the first time. Structural and magnetic properties of the products were investigated by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmison electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and electron spin resonance spectrometry (EPR). TEM measurements showed that morphology of the product depends on the synthesis method employed. The average cystallite size of NiFe2O4 nanoparticles was in the range of 14–59 nm as measured by XRD. The uncoated sample (Method A) had an EPR linewidth of 1973 Oe, the coated samples reached lower values. The magnetic dipolar interactions existing among the Ni ferrite nanoparticles are reduced by the coatings, which could cause the decrease in the linewidth of the EPR signals. Additionally, the linewidth increases with an increase in the size and the size distribution of nanoparticles.

scholarly journals Investigation on pyrolysis of some organic raw materials

2017 ◽  
Vol 17 (43) ◽  
pp. 5-13
Author(s):  
Purevsuren B ◽  
Davaajav Ya ◽  
Batbileg S ◽  
Ariunaa A ◽  
Namkhainorov J ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Epoxy Resin ◽  
Raw Materials ◽  
Gaseous Products ◽  
Animal Bone ◽  
Waste Milk ◽  
Heavy Fractions ◽  
Milk Casein ◽  
First Time

We have been working on pyrolysis of some organic raw materials including different rank coals, oil shale, wood waste, animal bone, cedar shell, polypropylene waste, milk casein and characterization of obtained hard residue, tar and pyrolytic water and gas after pyrolysis. The technical characteristics of these organic raw materials have been determined and the thermal stability characteristics such as thermal stability indices (T5% and T25%) determined by using thermogravimetric analysis. The pyrolysis experiments were performed at different heating temperatures and the yields of hard residue, tar, pyrolysis water and gaseous products were determined and discussed. The main technical characteristics of hard residue of organic raw materials after pyrolysis have been determined and the adsorption ability of pyrolysis hard residue and its activated carbon of organic raw materials also determined. The pyrolysis tars of organic raw materials were distilled in air condition and determined the yields of obtained light, middle and heavy fractions and bitumen like residue with different boiling temperature. This is the first time to investigate the curing ability of pyrolysis tars of organic raw materials for epoxy resin and the results of these experiments showed that only tar of milk casein has the highest (95.0%), tar of animal bone has certain (18.70%) and tars of all other organic raw materials have no curing ability for epoxy resin.

Hydrothermal Synthesis and Characterization of Mn-Doped VO2 Nanowires

MRS Advances ◽  
2019 ◽  
Vol 4 (14) ◽  
pp. 829-836
Author(s):  
G. Long ◽  
David Matatov ◽  
Acher Suissa ◽  
Elmustapha Feddi ◽  
M. EL Yadri ◽  
...  
Keyword(s):  
High Pressure ◽  
Citric Acid ◽  
Vanadium Dioxide ◽  
Doping Concentration ◽  
Hydrothermal Process ◽  
Single Step ◽  
Synthesis And Characterization ◽  
Imaging And Spectroscopy ◽  
Mn Doped

AbstractMonoclinic VO2 is a known polymorph of vanadium dioxide that has received much attention due to its oxidative capabilities, geometric configuration, and promising applications in functional windows. VO2 can usually be obtained through a hydrothermal method under high pressure. In this work we report a synthesis of VO2 doped with Manganese using a rapid single-step hydrothermal process with V2O5, manganese (II) acetate and citric acid as precursors. Different syntheses were carried out in which the concentration of V2O5 and citric acid remained constant whereas the concentration of manganese (II) acetate was varied. The reactants underwent a stirring phase for 30 minutes before being loaded into a hydrothermal reactor for 2.5 hours at 200°C. The resultant was washed three times to remove the residual precursors. Imaging and spectroscopy characterizations such as TEM, SEM and UV-VIS-NIR have been performed on different doping concentration and the results display a dependence on doping concentrations.

scholarly journals Identification of B-Cell Epitopes on Virus-Like Particles of Cutaneous Alpha-Human Papillomaviruses

2009 ◽  
Vol 83 (24) ◽  
pp. 12692-12701 ◽  
Author(s):  
Tilo Senger ◽  
Maria R. Becker ◽  
Lysann Schädlich ◽  
Tim Waterboer ◽  
Lutz Gissmann
Keyword(s):  
B Cell ◽  
Large Fraction ◽  
Human Papillomaviruses ◽  
B Cell Epitopes ◽  
Virus Like Particle ◽  
Linear Epitopes ◽  
Hpv Types ◽  
First Time

ABSTRACT Human papillomavirus (PV) (HPV) types 2, 27, and 57 are closely related and, hence, represent a promising model system to study the correlation of phylogenetic relationship and immunological distinctiveness of PVs. These HPV types cause a large fraction of cutaneous warts occurring in immunocompromised patients. Therefore, they constitute a target for the development of virus-like particle (VLP)-based vaccines. However, the immunogenic structure of HPV type 2, 27, and 57 capsids has not been studied yet. Here we provide, for the first time, a characterization of the B-cell epitopes on VLPs of cutaneous alpha-HPVs using a panel of 94 monoclonal antibodies (MAbs) generated upon immunization with capsids from HPV types 2, 27, and 57. The MAbs generated were characterized regarding their reactivities with glutathione S-transferase-L1 fusion proteins from 18 different PV types, the nature of their recognized epitopes, their isotypes, and their ability to neutralize HPV type 2, 27, 57, or 16. In total, 33 of the 94 MAbs (35%) showed type-specific reactivity. All type-specific MAbs recognize linear epitopes, most of which map to the hypervariable surface loop regions of the L1 amino acid sequence. Four of the generated MAbs neutralized pseudovirions of the inoculated HPV type efficiently. All four MAbs recognized epitopes within the BC loop, which is required and sufficient for their neutralizing activity. Our data highlight the immunological distinctiveness of individual HPV types, even in comparison to their closest relatives, and they provide a basis for the development of VLP-based vaccines against cutaneous alpha-HPVs.

Synthesis and powder diffraction analysis of tri-rubidium penta-tantalum oxide, Rb3Ta5O14, with novel three-dimensionally nanostructured Rb-bearing channels

2003 ◽  
Vol 18 (1) ◽  
pp. 2-6
Author(s):  
A. Oono ◽  
M. Yashima ◽  
D. du Boulay ◽  
N. Ishizawa ◽  
A. Saiki ◽  
...  
Keyword(s):  
Diffraction Analysis ◽  
Single Crystals ◽  
Powder Diffraction ◽  
Raw Materials ◽  
Tantalum Oxide ◽  
Powder Pattern ◽  
Synthesis And Characterization ◽  
First Time

The powder pattern of Rb3Ta5O14 is reported here for the first time. Single crystals of Rb3Ta5O14 of 0.1–0.2 mm in size were grown using a RbCl flux at 1100 °C. The Rb3Ta5O14 powders were synthesized at 1200 °C by firing the Rb2CO3 and Ta2O5 raw materials with starting Rb/Ta ratios ranging from 0.450 to 0.800. The products with Rb/Ta ratios between 0.550 and 0.633 contained almost pure Rb3Ta5O14 with Rb/Ta ratio of 0.600, while those with Rb/Ta ratio larger than 0.677 also contained the α form of Rb4Ta6O17 with the Rb/Ta ratio of 0.677. Past studies of the synthesis and characterization of Rb4Ta6O17 should be carefully examined in the light of possible coexistence with Rb3Ta5O14, because the former structure has not been completely solved, and thus the powder pattern is inaccurate, while the presence of the latter had not been known until the present study.

scholarly journals Thiol-Functionalization Carbonaceous Adsorbents for the Removal of Methyl-Mercury from Water in the ppb Levels

Water ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 49
Author(s):  
Evgenios Kokkinos ◽  
Aggeliki Lampou ◽  
Ioannis Kellartzis ◽  
Dimitrios Karfaridis ◽  
Anastasios Zouboulis
Keyword(s):  
Methyl Mercury ◽  
Raw Materials ◽  
Health Concern ◽  
Esterification Reaction ◽  
Dominant Form ◽  
Isothermal Adsorption ◽  
Functionalized Materials ◽  
Toxic Pollutant ◽  
Thiol Functionalization

Mercury is a highly toxic pollutant of major public health concern, and human exposure is mainly related to the aqueous phase, where its dominant form is methyl-mercury (MeHg). In the current work, two carbon-based adsorbents, i.e., a commercial activated carbon and a sunflower seeds’ biochar, were modified by the introduction of thiol-active groups onto their surfaces for the MeHg removal from natural-like water in ppb concentration levels. The examined thiol-functionalization was a two-step process, since the raw materials were initially treated with nitric acid (6 N), which is a reagent that favors the formation of surface carboxyl groups, and subsequently by the thiol surface bonding groups through an esterification reaction in methanol matrix. The adsorbents’ capacity was evaluated toward the Hgtotal legislative regulation limit (1 μg/L) in drinking water (denoted as Q1). The respective isothermal adsorption results revealed an increased affinity between MeHg and thiol-functionalized materials, where the commercial carbon showed slightly higher capacity (0.116 μg Hg/mg) compared with the biochar (0.108 μg Hg/mg). This variation can be attributed to the respective higher surface area, resulting, also, to higher thiol groups loading. Regarding the proposed mechanism, it was proved that the S-Hg bond was formed, based on the characterization of the best performed saturated adsorbent.

New technique for elaboration and characterization of a high voltage spinel LiCo2O4 cathode and theoretical investigation

2020 ◽  
Vol 44 (6) ◽  
pp. 2538-2546 ◽  
Author(s):  
Y. Mouhib ◽  
M. Belaiche ◽  
C. Ahmani Ferdi ◽  
Mohammed Lacham ◽  
Abdelhamid Elacham
Keyword(s):  
Low Temperature ◽  
Theoretical Investigation ◽  
High Voltage ◽  
Raw Materials ◽  
Experimental Results ◽  
New Technique ◽  
First Time

Nanoparticles of LiCo2O4 were elaborated for the first time at low temperature using non-standard Moroccan raw materials. All theoretical and experimental results confirm the obtaining of spinel LiCo2O4 at 400 °C, with high crystalline purity.

ON THE PROCESSING OF HEMATITE RAW MATERIALS AT THE KRYVOROZHSK MINING AND PROCESSING PLANT OF OXIDIZED ORE ON TECHNOLOGY OF DIRECT RECOVERY ITmk3

2018 ◽  
pp. 32-37
Author(s):  
P.I. Loboda ◽  
Younes Razaz ◽  
S. Grishchenko
Keyword(s):  
Magnetic Properties ◽  
Cast Iron ◽  
Iron Content ◽  
Raw Materials ◽  
Direct Reduction ◽  
Processing Plant ◽  
High Iron Content ◽  
High Iron ◽  
Direct Restoration ◽  
First Time

Purpose. To substantiate the efficiency of processing hematite raw materials at the Krivoy Rog Mining and Processing Plant of Oxidized Ores using the direct reduction technology itmk3®. Metodology. Analysis of the results of the itmk3® direct restoration technology developed by Kobe Steel Ltd., Japan and Hares Engineering GmbX, Austria, with a view to using it to process Krivbass hematite ores into granulated iron (so-called “nuggets”). Findings. The involvement in the production of hematite ores (oxidized quartzite) of Krivbass with high iron content, but with low magnetic properties for their processing into granular cast iron is grounded. Originality. The use of itmk3® direct reduction technology from Kobe Steel Ltd., Japan and Hares Engineering GmbH, Austria for the processing of Krivbass hematite ores into granular cast iron is justified for the first time. Practical value. The efficiency of the use of hematite ores (oxidized quartzite) has been substantiated, which can significantly reduce the costs in the mining cycle for the economical production of metallurgical products.

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