scholarly journals The influence of some factors on the electrical conductivity and particle size of core/shell polystyrene/polyaniline composites

2005 ◽  
Vol 70 (11) ◽  
pp. 1263-1271 ◽  
Author(s):  
Gordana Nestorovic ◽  
Slobodan Jovanovic ◽  
Katarina Jeremic
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Oxidative Polymerization ◽  
Composite Particles ◽  
Core Shell ◽  
Chemical Oxidative Polymerization ◽  
Electrically Conductive ◽  
Pani Composite ◽  
Order Of Magnitude ◽  
Polyaniline Composites

The electrically conductive, micron-sized, core/shell polystyrene (PS)/polyaniline (PANI) composite particles were synthesized by chemical oxidative polymerization of aniline in the presence of micron-sized PS particles in 1 M HCl. The conditions of the dispersion polymerization of styrene were optimized. The influence of the initiator type employed for the chemical oxidative polymerization of aniline and the aniline (ANI) concentration on the PS/PANI particle size and size distribution and their conductivity was investigated. The obtained results show that the conductivity of the samples increased with increasing ANI concentration. The conductivity of the PS/PANI composite particles obtained with the highest ANI concentration was of the same order of magnitude as that for PANI powder. The particle size did not depend on the concentration of ANI, while the particle size distribution was narrower at higher concentrations of ANI. .

Synthesis of an MXene/polyaniline composite with excellent electrochemical properties

2020 ◽  
Vol 8 (12) ◽  
pp. 5853-5858 ◽  
Author(s):  
Huizhong Xu ◽  
Dehua Zheng ◽  
Faqian Liu ◽  
Wei Li ◽  
Jianjian Lin
Keyword(s):  
Electrochemical Properties ◽  
Oxidative Polymerization ◽  
Electrochemical Performances ◽  
Chemical Oxidative Polymerization ◽  
Pani Composite

We synthesized a new MXene/PANI composite by chemical oxidative polymerization of aniline monomers with enhanced electrochemical performances.

EFFECT OF COATING CONTENT ON THE PROPERTIES OF A1(OH)3–Y(OH)3/ZrB2 COMPOSITE PARTICLES

2007 ◽  
Vol 14 (03) ◽  
pp. 445-449 ◽  
Author(s):  
JIE-GUANG SONG ◽  
LIAN-MENG ZHANG ◽  
JUN-GUO LI ◽  
JIAN-RONG SONG
Keyword(s):  
Particle Size ◽  
High Temperature ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Oxidation Resistance ◽  
Zirconium Diboride ◽  
Resistance Ratio ◽  
Composite Particles ◽  
High Temperature Materials

Zirconium diboride is widely applied to high-temperature materials, but it is easily oxidized at high temperature. To increase the oxidation resistance of zirconium diboride at high temperature, the A 1( OH )3– Y ( OH )3 is coated on the ZrB 2 surface to prepare A 1( OH )3– Y ( OH )3/ ZrB 2 composite particles. In this paper, the effect of coating content on the properties of A 1( OH )3– Y ( OH )3/ ZrB 2 composite particles is investigated. It is analyzed that the particle size and particle size distribution of A 1( OH )3– Y ( OH )3/ ZrB 2 composite particles is increased with the coating content. The dispersion of ZrB 2 particles is largely increased with the coating content of 0%–20%; the dispersion of ZrB 2 particles is similar when the coating content is from 20% to 30%. The oxidation resistance ratio of the ZrB 2 particles with 30% coating content is the best than that of other conditions—it is about three times more than that of the original ZrB 2 particles.

Synthesis and characterization of polyaniline nanomaterials with different molar ratio of monomer

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Priyanka S ◽  
Dhachanamoorth N ◽  
Birundha B
Keyword(s):  
Particle Size ◽  
Initial Conditions ◽  
Oxidative Polymerization ◽  
Molar Ratio ◽  
Synthesis Process ◽  
Chemical Oxidative Polymerization ◽  
Good Tool ◽  
Particle Size Analyzer ◽  
Ft Ir

Formation of polymer nanomaterials are achieved by the process of polymerization and there was an availability of different methods such as chemical oxidative polymerization,electro chemical polymerization, In-situ oxidative polymerization and emulsion polymerization etc., Many monomers combine to form polymers under certain conditions by chemical reactions between the monomers. The chemical oxidative polymerization was most commonly used method to synthesize PANI and the synthesis process involved various molar ratio of aniline (0.1M, 0.2M, 0.3M) in which APS was used as an oxidant with dopant of HCl. This study revealed that the properties changed based on their initial conditions. The prepared aromatic polyaniline was characterized by FT-IR, UV-VIS,Particle size analyzer techniques and anti-bacterial activity of the sample was analyzed.FT-IR spectroscopy gives deep view of many  functional groups that were present in a system by measuring vibrational frequencies of chemical bonds involved. UV-VIS was a good tool to identify, characterize and to study the optical properties of nanomaterials.In particle size analyzer, the size of a particle was measured using the instrument laser diffraction particle size analyzer (SALD-2300). The synthesized polyaniline had the tendency to resist the growth of both gram positive and gram negative bacteria. These organic conducting polymers were sometimes called “smart polymers” and have varies application in medical, OLED, solar cell, batteries and sensor etc.,

scholarly journals Preparation and Characterization of Colon-Targeted Particles of Pulsatilla chinensis Saponins

2015 ◽  
Vol 10 (2) ◽  
pp. 1934578X1501000 ◽  
Author(s):  
Zhenhua Chen ◽  
Yongmei Guan ◽  
Leilei Zhou ◽  
Ying Xu ◽  
Ming Yang ◽  
...  
Keyword(s):  
Ulcerative Colitis ◽  
Particle Size ◽  
Surface Characteristics ◽  
Shell Structures ◽  
Composite Particles ◽  
Core Shell ◽  
Eudragit S100 ◽  
Pulsatilla Chinensis ◽  
Diffraction Peaks

Pulsatilla chinensis (Bunge) Regel is a traditional Chinese medicine used to treat ulcerative colitis. This study prepared and characterized colon-targeted particles of P. chinensis saponins by particle design. Most of the P. chinensis saponins in the composite particles were coated with Eudragit S100, as seen in SEM micrographs; meanwhile, the characteristic diffraction peaks in X-RD, surface wettability, and particle size distribution of the composite particles were basically the same as those of Eudragit S100. These results suggested that the mechanochemical process could be used to prepare colon-targeted particles with core-shell structures with the drug coated by the excipient; the results also showed similar surface characteristics in the coating.

scholarly journals Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell composites

2017 ◽  
Vol 35 (1) ◽  
pp. 94-104 ◽  
Author(s):  
Yewen Xu ◽  
Guozhu Shen ◽  
Hongyan Wu ◽  
Bin Liu ◽  
Xumin Fang ◽  
...  
Keyword(s):  
Double Layer ◽  
Reflection Loss ◽  
Oxidative Polymerization ◽  
Single Layer ◽  
Core Shell ◽  
Total Thickness ◽  
Absorption Bandwidth ◽  
Pani Composite ◽  
Line Theory ◽  
Minimum Reflection Loss

AbstractOrganic-inorganic nano-CoFe2O4/PANI (polyaniline) multi-core/shell composites have been successfully synthesized by chemical oxidative polymerization of aniline. The characterization results showed that the ferrite nanocrystals were efficiently embedded in PANI. The electromagnetic parameters of the composites were measured by a vector network analyser in the frequency range of 2 GHz to 18 GHz. Double-layer absorbers based on the CoFe2O4/PANI composite (matching layer) and calcined CoFe2O4 ferrite (absorbing layer) have been designed. The reflection loss of the microwave absorbers of both single layer and double-layer with a total thickness of 2.0 mm and 2.5 mm was calculated according to transmission-line theory. The results indicated that the minimum reflection loss of the CoFe2O4/PANI composite was −19.0 dB at 16.2 GHz at the thickness of 2.0 mm and −23.6 dB at 13.1 GHz at the thickness of 2.5 mm, respectively. The minimum reflection loss for double-layer absorbers reached −28.8 dB at 16.2 GHz at the total thickness of 2.0 mm, and −31.1 dB at 12.8 GHz at the total thickness of 2.5 mm. The absorption bandwidth under −10 dB was 4.2 GHz (13.8 GHz to 18.0 GHz) and 5.5 GHz (10.3 GHz to 15.8 GHz), respectively. The results show that the reflection loss and absorption bandwidth of the double-layer absorbers are obviously enhanced compared to corresponding single layer absorbers.

Spin injection behavior in conducting polymer coated superparamagnetically functional microstructures

2014 ◽  
Vol 28 (15) ◽  
pp. 1450119 ◽  
Author(s):  
Arun S. Prasad
Keyword(s):  
Crystal Growth ◽  
Spin Injection ◽  
Oxidative Polymerization ◽  
Magnetic Core ◽  
Precipitation Method ◽  
Core Shell ◽  
Chemical Oxidative Polymerization ◽  
Thermo Gravimetric ◽  
Co Precipitation ◽  
Dielectric Results

A nanoferrite superparamagnetic system synthesized through co-precipitation method and subsequently dispersed in a medium of de-ionized water was encapsulated with a matrix polymer under constant sonication using chemical oxidative polymerization technique. The polymer coated functional microstructure thus obtained shows enhanced magnetization as evidenced from the results reported elsewhere. The magnetic core crystal growth and anti-spin canting hypothesis were given to be the most general justification behind the unusual enhancement in magnetization and more specifically the rationale could understand recently in accordance with spin injection behavior in functional core-shell microstructures. In this paper, an attempt has been made to correlate the previous magnetization results with spin injection behavior, in conjunction with the thermo gravimetric and dielectric results.

Optimization and thermal effects of polyaniline nanomaterial synthesized by chemical oxidative polymerization method

2020 ◽  
Vol 3 (2) ◽  
Author(s):  
Dhachanamoorthi N ◽  
Padmapriya B
Keyword(s):  
Particle Size ◽  
Antibacterial Activity ◽  
Functional Group ◽  
Oxidative Polymerization ◽  
Quantitative Information ◽  
Particle Size Analysis ◽  
Polymer Materials ◽  
Size Analysis ◽  
Chemical Oxidative Polymerization ◽  
Polymerization Method

Scientific zone has a great attention to the polyaniline (PANI) nanomaterials which is an organic, conductive and a conjugated polymer. It has variety of applications such as in batteries, microelectronics displays, antistatic coatings, electromagnetic shielding materials and actuators [1]. PANI was synthesized by using chemical oxidative polymerization method. The preparation process carried out by the main reagent aniline (C6H7N) with the ammonium peroxydisulpate (APS) ((NH4)2S2O8) which act as an oxidant and hydrochloric acid (HCL) as a dopant in an ambient temperature. The synthesized polymer materials are annealed at different temperatures such as 200°C,300°C and 400°C. After annealed treatment, the weight percentage of polymer material are changed were decreases with increase the temperature of pure PANI (0.441g),200°C(0.172g), 300°C(0.147g), 400°C (0.105g). Then the obtained polymer materials are characterized by FTIR, UV-Visible, Particle size analysis (PSA) and Antibacterial analysis. FTIR is used to determine the functional group of polymer nanomaterials. UVVisible exhibits the quantitative information about the polymer nanomaterials by using its band gap. The size of the individual particles and the size distribution range of the respective samples are determined by the Particle Size Analyzer (PSA). Antibacterial activity is used to find the polymer nanomaterials which kills bacteria, or bacteriostatic,which slow down the growth of bacteria. These profiling techniques are used to find the properties like functional group, quantitative information, particle size, antibacterial activity of respective polyaniline nanomaterial samples.

Facile Synthesis of Core-shell Structured CuS@PANI Microspheres and Electrochemical Capacitance Investigations

2017 ◽  
Vol 25 (6) ◽  
pp. 483-488
Author(s):  
Chunnian Chen ◽  
Qi Zhang ◽  
Chengyang Peng
Keyword(s):  
Current Density ◽  
Oxidative Polymerization ◽  
Core Shell ◽  
Discharge Process ◽  
Electrochemical Capacitance ◽  
Composite Microsphere ◽  
Pani Composite ◽  
Discharge Profile ◽  
A Current ◽  
Charge Discharge

A core-shelled structure CuS@PANI composite microsphere was successfully synthesized via chemical oxidative polymerization procedure and the electrochemical performance was investigated. The as-prepared composites were characterized by FE-SEM, TEM and XRD, and their particulate structure has been confirmed. Interestingly, the CuS microsphere was not a whole solid but composed of several sheet-like subunits, and the PANI was loosely-coated on the surface of spherical CuS particles. The advantage of this kind of core-shell structure is that PANI has better conductivity, which favors the electronic conductive channels to the CuS cores. Moreover, the loosely-attached PANI could buffer the disadvantages of the volume changes of CuS during the charge-discharge process. The galvanostatic charge/discharge profile shows a specific capacitance of 308.1 F g−1 at a current density of 0.5 A g−1 and the composite retained 71.6% of its initial capacitance after 1000 cycles at a current density of 1 A g−1.

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