Synthesis of conductive nanocomposites based on polyaniline/poly(styrene-alt-maleic anhydride)/polystyrene

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
P Najafi Moghadam ◽  
E Nazarzadeh Zareh
Keyword(s):  
Maleic Acid ◽  
Nano Particles ◽  
Sonochemical Method ◽  
Sem Images ◽  
Conductive Films ◽  
Conductive Nanocomposites ◽  
Blending Method ◽  
Vis Spectroscopy ◽  
The Matrix ◽  
Ft Ir

AbstractConducting polyaniline (PANI) nano particles doped with HCl was synthesized by a sonochemical method. Polyaniline/poly(styrene-alt-maleic acid)/polystyrene composites with different polyaniline content were developed by solution-dispersion blending method. The influence of poly(styrene-alt-maleic acid) concentration in composite structure was also investigated. The composite dispersed solution in tetrahydrofuran (THF) was cast to fabricate conductive films with evaporation of the solvent. With only a mixing procedure and without any dispersant added, the PANI nanoparticles were well dispersed in the matrix polymer as indicated by scanning electron microscopy (SEM) images. The conductivity of obtained composites was measured with four probe technique. All of obtained composites have conductivity and between them, the maximum electrical conductivity was 2.4 S/cm. The obtained composites were characterized by FT-IR and UV-Vis spectroscopy.

Study on the preparation and properties of polyamide/chitosan nanocomposite fabricated by electrospinning method

2021 ◽  
Author(s):  
Mahyar Fazeli ◽  
Faegheh Fazeli ◽  
Tamrin Nuge ◽  
Omid Abdoli ◽  
Shokooh Moghaddam
Keyword(s):  
Structural Characteristics ◽  
Decomposition Temperature ◽  
X Ray Diffraction ◽  
Good Adhesion ◽  
Sem Images ◽  
Electrospinning Method ◽  
Maximum Current ◽  
The Matrix ◽  
Ft Ir ◽  
Amine Groups

Abstract The principal intention of this work is to fabricate and characterize the polyamide/chitosan nanocomposite by a novel single solvent method through the electrospinning procedure. The thermal properties and morphology of prepared nanocomposite are studied by thermogravimetric analysis (TGA) and field-emission scanning electron microscopy (FE-SEM). TGA exposed that the primary decomposition temperature is reduced with rising of chitosan content in the nanocomposites and origin disintegration temperature for polyamide/chitosan nanocomposites is perceived to be in the range from 300 to 500°C. Also, FE-SEM images demonstrated that the nanofibers of chitosan have good adhesion on the matrix and are well-oriented. Besides, the crystallinity and structural characteristics of the polyamide/chitosan nanocomposites are investigated by using X-ray diffraction (XRD) and Fourier transform-infrared spectroscopy (FT-IR), respectively. The results of XRD proved that the successful blending of chitosan in polyamide is achieved via the electrospinning method. FT-IR results demonstrate that the nanofibers are consist of amine groups. Also, the electrical properties of the nanocomposite improved with the increasing content of chitosan and the conductivity of the polyamide/chitosan 5 wt% demonstrates the maximum current of 0.3 nA. Besides, the sheet resistance of the composite reduced 118 to 20 × 109 Ω with raising the chitosan volume from 0 to 5 wt%.

scholarly journals Green formulation and characterization of Fe nanoparticles containing Calendula ‎extract and investigation of the antioxidant, cytotoxicity and anti-human ‎cholangiocarcinoma properties

2021 ◽  
Author(s):  
Jisen Zhao ◽  
Yang Yu ◽  
Wang Yan ◽  
Shujie Cheng
Keyword(s):  
Cell Lines ◽  
Metallic Nanoparticles ◽  
Medical Diagnostics ◽  
Morphological Characterization ◽  
Sem Images ◽  
Integrative Research ◽  
Vis Spectroscopy ◽  
Cholangiocarcinoma Cell ◽  
Ft Ir

IntroductionOne of the simplest nanostructures that is widely used in industry today is metallic nanoparticles. Metallic ‎nanoparticles can bind non-destructively to single-stranded DNA, which are important in medical diagnostics. ‎Cancer nanotechnology developed a new area of integrative research in biology, chemistry, engineering, and ‎medicine, and is concerned with major advances in cancer diagnosis, prevention and treatment ‎Material and methods‎ In the recent study, the structural and morphological characterization of bio‐synthesized FeNPs@Calendula ‎arvensis was performed by FT-IR and UV-vis spectroscopy, scanning electron microscopy (SEM) that SEM ‎images have exhibited an equal and uniform spherical morphology in size of 30.13 nm. ‎ResultsIn the antioxidant test, the IC50 of FeNPs@Calendula arvensis and BHT against DPPH free radicals were 117 ‎and 88 µg/mL, respectively. In the anticancer test, the treated cells with FeNPs@Calendula arvensis were ‎assessed by MTT assay for 48h about the anti-human cholangiocarcinoma and ‎ cytotoxicity properties on normal ‎‎(HUVEC) and cholangiocarcinoma ‎ carcinoma cell lines i.e., HCM-CSHL-0174-C22, CCLP-1, and QBC939. ‎The IC50 of FeNPs@Calendula arvensis were 196, 237, and 278 µg/mL against HCM-CSHL-0174-C22, ‎CCLP-1, and QBC939‎ cell lines, respectively. The viability of cholangiocarcinoma cell line reduced dose-‎dependently in the presence of FeNPs@Calendula arvensis.‎ConclusionsIt appears that the anti-human cholangiocarcinoma effect of FeNPs@Calendula arvensis is due to their ‎antioxidant effects.‎

Green Synthesis of Silver Nanoparticles Using Olden-landia corymbosa and Ocimum sanctum Leaf Aqueous Extract

2020 ◽  
Vol 13 (3) ◽  
pp. 4959-4964
Author(s):  
Prof.(Dr.) Sirshendu Chatterjee Chatterjee ◽  
Shaktijit Das ◽  
Moumita Saha ◽  
Pranabesh Ghosh ◽  
Titav Sengupta ◽  
...  
Keyword(s):  
Medicinal Plants ◽  
Green Synthesis ◽  
Aqueous Extract ◽  
Nano Particles ◽  
Bioactive Molecules ◽  
Primary Amines ◽  
Ocimum Sanctum ◽  
Leaf Aqueous Extract ◽  
Vis Spectroscopy ◽  
Ft Ir

The field of nanotechnology is the most renowned area of research in modern day science. One of the most convenient and comprehensive technique related to the synthesis of nanoparticles using plant extracts and their subsequent action. On the other hand, herbal medicines become an integral part of modern-day treatment strategy around the globe; combination of these two ways are widely accepted and beneficial due to its low cost, better societal recognition and less side effects. Phytochemical analysis revealed that leaf aqueous extract of two medicinal plants Oldenlandia corymbosa and Ocimum sanctum, harbours high concentration of antioxidants and bioactive molecules. Hence our present course of study aims at the green synthesis of silver nano-conjugates using Oldenlandia corymbosa and Ocimum sanctum leaf aqueous extracts. The synthesized nano-conjugates have undergone advanced chara-cterization techniques including UV-Vis Spectro-photometry, DLS, and FT-IR. The UV-Vis spectroscopy results showed single peak at 420 nm and 430 nm for Oldenlandia corymbosa and Ocimum sanctum nano-conjugates, respectively. The particle size for Oldenlandia corymbosa and Ocimum sanctum nano-particles are 21.04 nm and 24.36 nm, respectively as observed from the DLS data, and finally, the FT-IR data confirms the conjugation of bioactive molecules of the medicinal plants indicating that primary amines, secondary amines, alcohols, phenols, aldehydes, aliphatic amines, alkenes, functional groups of the bioactive molecules are responsible for the stability of prepared silver nano-conjugates

The improvement of thermal conductivity in silica gel composite employing graphene nano-particles

2019 ◽  
Vol 33 (12) ◽  
pp. 1950147
Author(s):  
Jian Lv ◽  
Xiaoming Cai ◽  
Qianxu Ye ◽  
Jinming Cai
Keyword(s):  
Thermal Conductivity ◽  
Ball Milling ◽  
Efficient Method ◽  
Nano Particles ◽  
Heat Conducting ◽  
Sem Images ◽  
The Matrix ◽  
Milling Method ◽  
Cost Efficient ◽  
The One

Heat conducting gel sheets were fabricated with graphene nano-particles (GNPs) filler which was prepared by ball-milling method. The thermal conductivity of GNPs gel sheets (GNPs-GS) with 10 wt.% reaching 0.38 W/(m⋅K) at [Formula: see text] increased by 90% compared with the pure gel sheets (Pure-GS). The conduction of heat-sink device which was made of GNPs-GS with 10 wt.% is much faster than the one which was made of Pure-GS. FE-SEM images show that the GNPs are layered and uniformly distributed in the matrix, which demonstrated the actual exfoliation of GNPs in the process of ball-milling. This handy and cost-efficient method of ball-milling to exfoliate GNPs and further for fabricating heat conducting gel sheets is a feasible program in industrial production.

The fabrication and neutron shielding property of polyphenylene sulfide containing salicylic acid/Gd2O3 composites

2021 ◽  
pp. 095400832110214
Author(s):  
Yumin He ◽  
Pengcheng Li ◽  
Haohao Ren ◽  
Xi Zhang ◽  
Xiulian Chen ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Salicylic Acid ◽  
Thermal Property ◽  
High Strength ◽  
Polyphenylene Sulfide ◽  
Nano Particles ◽  
Neutron Shielding ◽  
Aerospace Applications ◽  
Blending Method ◽  
The Matrix

A series of neutron absorbing materials with good neutron absorbing capacity, high strength and good thermal property were designed and prepared in this work. First of all, polyphenylene sulfide containing different mole content of salicylic acid (SAPPS) in the main chain was synthesized by nucleophilic substitution polymerization under high pressure. Then the composites with different content of nano Gd2O3 and modified PPS were prepared by melt blending method. The testing results indicated that the copolymers SAPPS were synthesized successfully, there was an interface interaction between nano Gd2O3 and the matrix without the need for surfactants or coupling agents. Additionally, the content of nano Gd2O3 had no obvious influence on the thermal property of the composites. While following with the increase of the content of nano Gd2O3, the tensile strength of the composites increased firstly and then decreased, when the content of nano Gd2O3 was 10 wt%, the tensile strength of 10%Gd2O3/5%SAPPS reached the maximum value of 74.9 MPa. The results of neutron shielding testing indicated that the content of nano-particles had a large effect on the neutron shielding rate of composites. The neutron shielding rate of 50%Gd2O3/5%SAPPS composite was up to 83%. All of these results indicated that the Gd2O3/5%SAPPS had potential to be applied to the high-temperature resistance and thermal shielding materials in nuclear and aerospace applications.

PVDF-PAn Co-Polymer with High Permittivity Fabricated by Emulsion Polymerization

2009 ◽  
Vol 610-613 ◽  
pp. 512-517
Author(s):  
Yan Guo ◽  
D.B. Luo ◽  
Dong Pan ◽  
Han Xing Liu
Keyword(s):  
Emulsion Polymerization ◽  
Structural Information ◽  
Surface Active Agent ◽  
Matrix Material ◽  
Active Agent ◽  
Sem Images ◽  
Fine Property ◽  
The Matrix ◽  
Ft Ir ◽  
Xrd Patterns

With eEmploying dichloromethane as solvent, sodium dodecanesulphonate as surface active agent, ammonium persulphate as oxidizer, PAn was introduced into PVDF and co-polymer with high relative permittivity reaching to 280 was obtained by emulsion polymerization. By detecting the structural information and electrical property through FT-IR, XRD, SEM, informations about the co-polymers were presented and in this paper. By adjusting the quantity of aniline in polymerization and the concentrations of protonic acid in the post processing, polymers with different electric properties could bewere compared and analyzed. It was The SEM images and XRD patterns showed the crystallization and microstructure information of the co-polymers in comparison. Particularly, the SEM images showed that the PVDF-PAn co-polymers had homogeneous properties in certain constitute range and as a result of emulsion, spherical PAn-PVDF media was fabricated. After robber mixing procedure at certain temperature, the PAn had a relatively average-fine dissolving in the PVDF, which overcame the difficulty of dissolving PAn oin other substrateance. This ensured the fine property for the matrix material in composites. The XRD pattern showed, wWith the increasing of the introduction quantity of PAn, the crystallization of the entire material complex had been raised greatly.

Application of cadmium-doped ZnO for the solar photocatalytic degradation of phenol

2019 ◽  
Vol 79 (2) ◽  
pp. 375-385 ◽  
Author(s):  
Behzad Shahmoradi ◽  
Farzaneh Farahani ◽  
Shadi Kohzadi ◽  
Afshin Maleki ◽  
Mohammadamin Pordel ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Irradiation Time ◽  
Zno Nanorods ◽  
Bandgap Energy ◽  
Phenol Removal ◽  
Operational Parameters ◽  
Sem Images ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Ft Ir

Abstract In this study, photocatalysis of phenol was studied using Cd-ZnO nanorods, which were synthesized by a hydrothermal method. The Cd-ZnO photocatalyst was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy, and Fourier transform infrared (FT-IR) and UV-Vis spectroscopy. XRD patterns exhibit diffraction peaks indexed to the hexagonal wurtzite structures with the P63mc space group. SEM images showed that the average size of the Cd-ZnO nanorods was about 90 nm. Moreover, the nanorods were not agglomerated and were well-dispersed in the aqueous medium. FT-IR analysis confirmed that a surface modifier (n-butylamine) did not add any functional groups onto the Cd-ZnO nanorods. The dopant used in this study showed reduction of the bandgap energy between valence and conduction of the photocatalyst. In addition, effect of various operational parameters including type of photocatalyst, pH, initial concentration of phenol, amount of photocatalyst, and irradiation time on the photocatalytic degradation of phenol has been investigated. The highest phenol removal was achieved using 1% Cd-ZnO for 20 mg/l phenol at pH 7, 3 g/l photocatalyst, 120 min contact time, and 0.01 mole H2O2.

Synthesis and Characterization of Polyaniline Conductive Composite Films

2012 ◽  
Vol 217-219 ◽  
pp. 1166-1169 ◽  
Author(s):  
Zheng Chen ◽  
Rui Qi Li ◽  
Qing Guo
Keyword(s):  
Sulfonic Acid ◽  
Composite Films ◽  
Acrylonitrile Butadiene Styrene ◽  
Gravimetric Analysis ◽  
As Doping ◽  
Conductive Films ◽  
Solution Blending ◽  
Blending Method ◽  
Ft Ir ◽  
Dodecylbenzene Sulfonic Acid

Conductive polyaniline(PANI) was synthesized by chemical oxidative copolymerization , using dodecylbenzene sulfonic acid (DBSA)as doping agent. PANI-DBSA/ABS conductive films were obtained by solution blending method, using chloroform as organic solvents. The products were characterized by means of digital four-point probe meter, FT-IR spectroscopy, thermal gravimetric analysis (TGA) and inverted metallurgical microscope. The results indicate that PANI-DBSA has good solubility because dodecylbenzene sulfonic acid (DBSA) plays a good doping role in polyaniline. Composite films’ electric conductivity improves with the increasing content of PANI and the percolation threshold is about 10wt% when conducting network formed. TGA curves demonstrate that product’s glass transition temperature is much higher than acrylonitrile-butadiene-styrene resin, furthermore, the thermal stability of composite films also improves compared with polyaniline or resin.

Green synthesis of mixed metallic nanoparticles using room temperature self-assembly

2017 ◽  
Vol 13 (2) ◽  
pp. 4671-4677 ◽  
Author(s):  
A. M. Abdelghany ◽  
A.H. Oraby ◽  
Awatif A Hindi ◽  
Doaa M El-Nagar ◽  
Fathia S Alhakami
Keyword(s):  
Self Assembly ◽  
Metallic Nanoparticles ◽  
Room Temperature ◽  
Bimetallic Nanoparticles ◽  
Reduction Process ◽  
Nano Particles ◽  
Nano Structure ◽  
Small Shift ◽  
Molar Ratios ◽  
Vis Spectroscopy

Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure.

The Development of Pemetrexed Diacid-Loaded Gelatin-Cloisite 30B (MMT) Nanocomposite for Improved Oral Efficacy Against Cancer: Characterization, In-Vitro and Ex-Vivo Assessment

2020 ◽  
Vol 17 (3) ◽  
pp. 246-256
Author(s):  
Kriti Soni ◽  
Ali Mujtaba ◽  
Md. Habban Akhter ◽  
Kanchan Kohli
Keyword(s):  
Drug Release ◽  
Oral Delivery ◽  
Ex Vivo ◽  
Confocal Laser ◽  
Release Mechanism ◽  
Scanning Calorimetry ◽  
Sem Images ◽  
Cloisite 30B ◽  
Ft Ir

Aim: The intention of this investigation was to develop Pemetrexed Diacid (PTX)-loaded gelatine-cloisite 30B (MMT) nanocomposite for the potential oral delivery of PTX and the in vitro, and ex vivo assessment. Background: Gelatin/Cloisite 30 B (MMT) nanocomposites were prepared by blending gelatin with MMT in aqueous solution. Methods: PTX was incorporated into the nanocomposite preparation. The nanocomposites were investigated by Fourier Transmission Infra Red Spectroscopy (FT-IR), Differential Scanning Calorimetry (DSC), Scanning Electron Microscope (SEM) X-Ray Diffraction (XRD) and Confocal Laser Microscopy (CLSM). FT-IR of nanocomposite showed the disappearance of all major peaks which corroborated the formation of nanocomposites. The nanocomposites were found to have a particle size of 121.9 ± 1.85 nm and zeta potential -12.1 ± 0.63 mV. DSC thermogram of drug loaded nanocomposites indicated peak at 117.165 oC and 205.816 oC, which clearly revealed that the drug has been incorporated into the nanocomposite because of cross-linking of cloisite 30 B and gelatin in the presence of glutaraldehyde. Results: SEM images of gelatin show a network like structure which disappears in the nanocomposite. The kinetics of the drug release was studied in order to ascertain the type of release mechanism. The drug release from nanocomposites was in a controlled manner, followed by first-order kinetics and the drug release mechanism was found to be of Fickian type. Conclusion: Ex vivo gut permeation studies revealed 4 times enhancement in the permeation of drug present in the nanocomposite as compared to plain drug solution and were further affirmed by CLSM. Thus, gelatin/(MMT) nanocomposite could be promising for the oral delivery of PTX in cancer therapy and future prospects for the industrial pharmacy.

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