scholarly journals Phase composition and morphology of nanostructured coatings deposited by laser dispersion of a mixture of polyethylene with iron oxalate

2020 ◽  
Vol 99 (3) ◽  
pp. 22-30
Author(s):  
A.S. Rudenkov ◽  
◽  
M.A. Yarmolenko ◽  
A.A. Rogachev ◽  
A.P. Surzhikov ◽  
...  
Keyword(s):  
Phase Composition ◽  
Carbon Nanostructures ◽  
Structural Heterogeneity ◽  
Nanocomposite Films ◽  
Mass Ratio ◽  
Composite Target ◽  
Iron Oxalate ◽  
Carbon Structures ◽  
Iron Oxide Coatings ◽  
Average Size

Peculiarities of forming of iron oxide coatings with reinforced carbon nanostructures from gas phase generated by laser dispersion of composite target were explored. Influence of technological modes of heat treatment on morphology and phase composition of nanostructured film layers was determined. It was found that on a substrate highly dispersed layers containing carbon nanostructures are formed. Using Raman spectroscopy it was shown that in oxide matrix carbon structures, which are mainly in the form of planar located nanotubes, appear. It was found that with a mass ratio of polyethylene and iron oxalate equal to 1:1, the distribution of the formed nanostructures in size is unimodal with a maximum near 20 nm. At dispersing of polyethylene and iron oxalate mixture with mass ratio 1:2 in deposited layers nanotubes have the least defectiveness. Patterns of influence on morphology and coatings phase composition of relative component abundance in being dispersed by laser radiation composite target were determined. It was shown that with the growing of iron oxalate concentration in the target coating structural heterogeneity increases, subroughness and average size of separate nanostructures in the deposited condensate grow. The obtained polymer matrix nanocomposite films can be used in sensors.

scholarly journals Magnetic and Structure Properties of CoPt-In₂O₃ Nanocomposite Films

2020 ◽  
pp. 431-438
Author(s):  
Liudmila E. Bykova ◽  
Victor G. Myagkov ◽  
Victor S. Zhigalov ◽  
Alexei A. Matsynin ◽  
Dmitry A. Velikanov ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Phase Composition ◽  
Room Temperature ◽  
Vacuum Annealing ◽  
Nanocomposite Films ◽  
Film System ◽  
Temperature Range ◽  
Structural And Magnetic Properties ◽  
Average Size ◽  
Structure Properties

The structural and magnetic properties of CoPt-In₂O₃ nanocomposite films formed by vacuum annealing of the In/(Co3O4 + Pt)/MgO film system in the temperature range of 100–800 ◦C have been investigated. The synthesized nanocomposite films contain ferromagnetic CoPt grains with an average size of 5nm enclosed in an In2O3 matrix, and have a magnetization of 600 emu/cm3, and a coercivity of 150 Oe at room temperature. The initiation 200 ◦C and finishing 800 ◦C temperatures of synthesis were determined, as well as the change in the phase composition of the In/(Co3O4 + Pt)/MgO film during vacuum annealing

scholarly journals Formation of phase composition of Ag-Cu bimetallic nanoparticles obtained by electrical explosion of wires

2020 ◽  
pp. 97-101
Author(s):  
A.V. Pervikov ◽  
◽  
A.S. Lozhkomoev ◽  
O.V. Bakina ◽  
M.I. Lerner ◽  
...  
Keyword(s):  
Phase Composition ◽  
Bimetallic Nanoparticles ◽  
Structural Phase ◽  
Electrical Explosion ◽  
Electric Explosion ◽  
Cu Nanoparticles ◽  
Mass Ratio ◽  
Structural Phase State ◽  
Electrical Explosion Of Wires ◽  
Average Size

In present work we observed structural phase state formation of Ag-Cu nanoparticles by electrical explosive of wires. We observed the formation of bimetallic nanoparticles with a number average size of 75 ... 82 nm by synchronous and nonsynchronous electric explosion of wires. The phase composition of the samples is represented by phases based on solid solutions of copper and silver. The results of the studies allow us to conclude that, using electric explosion of copper and silver wires, bimetallic Ag-Cu nanoparticles with different mass ratio of metals can be obtained.

scholarly journals Digitally Patterned Mesoporous Carbon Nanostructures of Colorless Polyimide for Transparent and Flexible Micro-Supercapacitor

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2547
Author(s):  
Hyeonwoo Kim ◽  
Suwon Hwang ◽  
Taeseung Hwang ◽  
Jung Bin In ◽  
Junyeob Yeo
Keyword(s):  
Carbon Nanostructures ◽  
Specific Area ◽  
Bending Test ◽  
Chemical Compositions ◽  
Carbon Structure ◽  
Carbon Structures ◽  
Direct Laser ◽  
Mechanical Bending ◽  
Minimal Reduction ◽  
High Flexibility

Here, we demonstrate the fabrication of a flexible and transparent micro-supercapacitor (MSC), using colorless polyimide (CPI) via a direct laser writing carbonization (DLWC) process. The focused laser beam directly carbonizes the CPI substrate and generates a porous carbon structure on the surface of the CPI substrate. Fluorine, which is one of the chemical compositions of CPI, can enhance the specific area and the conductivity of the carbon electrode by creating micropores in carbon structures during carbonization. Thus, the fabricated carbonized CPI-based MSC shows enhanced specific capacitance (1.20 mF at 10 mV s−1) and better transmittance (44.9%) compared to the conventional PI-based MSC. Additionally, the fabricated carbonized CPI-based MSC shows excellent cyclic performance with minimal reduction (<~10%) in 3000 cycles and high capacitance retention under mechanical bending test conditions. Due to its high flexibility, transparency, and capacitance, we expect that carbonized CPI-based MSC can be further applied to various flexible and transparent applications.

scholarly journals Self-Cleaning Limestone Paint Modified by Nanoparticles TiO2 Synthesized from TiCl3 as Precursors and PEG6000 as Dispersant

2017 ◽  
Vol 12 (3) ◽  
pp. 351 ◽  
Author(s):  
Nur Fadhilah ◽  
Niki Etruly ◽  
Maktum Muharja ◽  
Dyah Sawitri
Keyword(s):  
Particle Surface ◽  
Wall Painting ◽  
Reaction Engineering ◽  
Mass Ratio ◽  
Particle Surface Area ◽  
Surface Tension Reduction ◽  
Agglomeration Process ◽  
Activating Agent ◽  
Self Cleaning ◽  
Average Size

Limestone is commonly used for wall painting, but it is easy to be dirty. In this study, a self-cleaning limestone paint was synthesized by modifying dispersant and TiO2 nanoparticles. The TiO2 that prepared by TiCl3 were functionalized with PEG6000 as a surface activating agent. The paint achieved highest impurity degradation of 83.11 % for the mass ratio of TiO2 and PEG6000 (MRTP) of 1: 6, in which TiO2 average size distribution was 75.81 µm2, the particle surface area of TiO2 was 2,544 µm2, and the smallest contact angle was 7°. It was found that the dispersant (PEG6000) significantly improved the self-cleaning ability of limestone paint. The surface tension reduction from PEG6000-modified prevented the agglomeration process of TiO2 and suggests that the limestone paint a good self-cleaning coating for wall painting. Copyright © 2017 BCREC Group. All rights reservedReceived: 21st November 2016; Revised: 10th September 2017; Accepted: 11st September 2017; Available online: 27th October 2017; Published regularly: December 2017How to Cite: Fadhilah, N., Etruly, N., Muharja, M., Sawitri, D. (2017). Self-Cleaning Limestone Paint Modified by Nanoparticles TiO2 Synthesized from TiCl3 as Precursors and PEG6000 as Dispersant. Bulletin of Chemical Reaction Engineering & Catalysis, 12(3): 351-356 (doi:10.9767/bcrec.12.3.800.351-356) 

Improving the fluorescence detection limit with positively charged carbon nanostructures as a low background signal platform

The Analyst ◽  
2014 ◽  
Vol 139 (9) ◽  
pp. 2114-2117 ◽  
Author(s):  
Xiulan He ◽  
Li Zhang ◽  
Hetong Qi ◽  
Ping Yu ◽  
Junjie Fei ◽  
...  
Keyword(s):  
Detection Limit ◽  
Fluorescence Detection ◽  
Carbon Nanostructures ◽  
Fluorescent Dyes ◽  
Energy Transfer Efficiency ◽  
Background Signal ◽  
Low Background ◽  
Carbon Structures ◽  
New Strategy ◽  
Positively Charged

We have demonstrated a new strategy to improve the fluorescence detection limit by enhancing the energy transfer efficiency between carbon structures and fluorescent dyes using polyimidazolium-functionalized carbon nanostructures as a low background signal platform.

scholarly journals Synthesis Features of Iron Oxide Nanopowders with High Magnetic and Sorption Properties

2018 ◽  
Vol 915 ◽  
pp. 116-120
Author(s):  
Sergiy Lavrynenko ◽  
Athanasios G. Mamalis ◽  
Dmitry Sofronov ◽  
Alexandra Odnovolova ◽  
Vadym Starikov
Keyword(s):  
Phase Composition ◽  
Magnetic Particles ◽  
Deposition Process ◽  
Spherical Particles ◽  
Sorptive Capacity ◽  
Extraction Separation ◽  
Average Size ◽  
Increasing Temperature ◽  
Magnetite Phase ◽  
Purification Of Water

The magnetic particles of iron oxides are promising materials for the purification of water from ions of heavy metals and radionuclides. Their advantage compared to other sorbents is the ability to extract by applied magnetic field, which greatly simplifies the task of extraction, separation and processing in cleaning technologies. The aim of this work is investigation of temperature and concentration of iron in the solution effect on the phase composition, nanoparticle size and their magnetization. Phase magnetite in the sample increases with increasing temperature and the magnetization decreases slightly with increasing the initial concentration of iron in solution. We found that regardless of the conditions of deposition formed spherical particles whose average size ranges from 7 to 15 nm. The sorptive capacity of the particles is virtually independent of the phase composition and for cobalt is about 18 mg/g. For sorption-based material magnetic particles Fe3O4 recommended to carry out the deposition process at a temperature not lower than 80°C. The concentration of iron in solution must be within 0,15–0,3M. The particles obtained contain in their composition at least 90 wt.% of magnetite phase and are characterized by a magnetization in the range of 65–70 A·m2/kg. Also in the paper is comparing efficiency of extraction and sorption capacity for cobalt particles by different phase of magnetite and hematite.

Electrodeposition of Copper / Cuprous Oxide Nanocomposites

1996 ◽  
Vol 451 ◽  
Author(s):  
Jay A. Swrrzer ◽  
Eric W. Bohannan ◽  
Teresa D. Golden ◽  
Chen-Jen Hung ◽  
Ling-Yuang Huang ◽  
...  
Keyword(s):  
Phase Composition ◽  
Cuprous Oxide ◽  
Nanocomposite Films ◽  
Constant Current ◽  
Oxide Content ◽  
Copper Metal ◽  
Solution Ph ◽  
Mole Percent ◽  
Strong Function ◽  
Current Densities

ABSTRACTNanocomposite films of copper metal and cuprous oxide were electrodeposited at room temperature from an alkaline copper(11) lactate solution. The electrode potential oscillated spontaneously during constant-current deposition of the composites. The oscillations were periodic in a stirred solution, but became chaotic in unstirred solution. For a given current density the phase composition was a strong function of solution pH. As the pH was increased, the cuprous oxide content increased. At pH 12, no oscillations were observed, and pure cuprous oxide was deposited. At pH 9, the phase composition varied from pure cuprous oxide at current densities below 0.1 mA/cm2 to 96 mole percent copper at 2.5 mA/cm2.

Influence of Cosurfactant on the Structure and Properties of ZrO2 Nano-Powders Prepared in Microemulsion System

2008 ◽  
Vol 368-372 ◽  
pp. 729-731
Author(s):  
Chun Lei Geng ◽  
Zhen Feng Zhu ◽  
Wei Jie Yu
Keyword(s):  
Specific Surface ◽  
Xrd Analysis ◽  
Microemulsion System ◽  
Structure And Properties ◽  
Distillation Process ◽  
Mass Ratio ◽  
Surface Areas ◽  
Specific Surface Areas ◽  
Average Size ◽  
Triton X

ZrO2 nano-powders were prepared by a microemulsion process with the water-in-oil system of water/cyclohexane/Triton X-100/hexyl alcohol. The influence of cosurfactant content and the heterogeneous distillation process on the structure and properties of the particles was studied. XRD analysis showed that the cosurfactant content has little influence on the crystal phase of ZrO2. With the increasing mass ratio of cosurfactant to surfactant from 0.3 to 0.5 and 0.7, the average size of ZrO2 powders increases from 23.3 to 25.2 and 27.5 nm. The heterogeneous distillation process can effectively inhibit the formation of hard agglomeration during evaporation and increase the specific surface areas of ZrO2 powders.

Phase composition and structure of nanocrystalline products of solid-phase oxidative thermolysis of iron oxalate dihydrate

2012 ◽  
Vol 53 (3) ◽  
pp. 548-556 ◽  
Author(s):  
D. A. Yatsenko ◽  
V. P. Pakharukova ◽  
S. V. Tsybulya ◽  
A. A. Matvienko ◽  
A. A. Sidel’nikov
Keyword(s):  
Phase Composition ◽  
Solid Phase ◽  
Iron Oxalate ◽  
Oxalate Dihydrate ◽  
Composition And Structure

Preparation of Polystyrene Microspheres by Suspension Polymerization

2011 ◽  
Vol 233-235 ◽  
pp. 2215-2218 ◽  
Author(s):  
Jin Ling Ma ◽  
Xing Hua Zhang
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Suspension Polymerization ◽  
Mass Ratio ◽  
Initiator Concentration ◽  
Polystyrene Microspheres ◽  
Average Size

Polystyrene (PS) microspheres with different sizes were prepared by suspension polymerization. The effect of initiator concentration on the average sizes and size distribution was evaluated. The results showed that the average size of PS microspheres increases with increasing initiator content, the optimal uniformity of PS microspheres was attained when the mass ratio of BPO to styrene was 1.5:100. The effect of stirring speed on the particle size was also investigated. The average size of PS microspheres reduced with the increase of the stirring speed.

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