Superficial and electrical characterization of thin films based on Chitosan/polypyrrole/MWCNT

2016 ◽  
Vol 1819 ◽  
Author(s):  
A. Olarte-Paredes ◽  
R. Salgado-Delgado ◽  
A. M. Salgado-Delgado ◽  
E. Rubio-Rosas ◽  
E. García-Hernández ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Surface Characterization ◽  
Electrochemical Impedance ◽  
High Surface ◽  
Electrical Characterization ◽  
Volume Ratio ◽  
Homogeneous Distribution ◽  
Multilayer Carbon Nanotubes ◽  
Mechanical And Electrical Properties ◽  
The Matrix

ABSTRACTIn recent decades conducting polymers have attracted attention due to their promising and versatile applications in different fields. There is a considerable interest in the application of nanotubes multilayer carbon (MWCNT) because of their unique structure, high electrical conductivity, high chemical stability, and high surface-to-volume ratio. These properties make MWCNT extremely attractive for fabricating sensors. Composites based on a matrix of a biopolymer such as the chitosan (CS) with a lot of conductive polymers or (MWCNT), have received increasing attention due to their attractive structural, mechanical and electrical properties that could have applications in different fields such as tissue engineering, biomedicine, and manufacture of sensors and biosensors. Have been reported conducting polymer composites with an extensive range of interesting mechanical and electrical properties, which is reported in this paper to obtain films by ultrasonic bath mixing of Chitosan 3% w/v using polypyrrole (PPy) and multilayer carbon nanotubes. Surface characterization was performed using scanning electron microscopy (SEM). The electrical properties were analyzed using electrochemical impedance spectroscopy (EIS) in a frequency range 0.01 - 10E+5 Hz to 10 mV AC. The results show that the films of CS/PPy/MWCNT have a homogeneous distribution where the chitosan envelops the loads, while for EIS retention load was observed within the matrix observing these materials in accordance with the equivalent circuit of Warburg showing diffusional process.

Effects of Functionalization MWCNTs on the Mechanical and Electrical Properties of nylon-6 Composites

2013 ◽  
Vol 750-752 ◽  
pp. 127-131 ◽  
Author(s):  
Xiang Dong Zhu ◽  
Qing Jie Jiao ◽  
Chong Guang Zang ◽  
Xian Peng Cao
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Volume Ratio ◽  
Nylon 6 ◽  
Coupling Process ◽  
Mechanical And Electrical Properties ◽  
Multi Walled Carbon Nanotube ◽  
The Matrix ◽  
The Impact ◽  
Coupling Treatment

Chemically coupling functionalization multi-walled carbon nanotube (MWCNTs)/nylon-6 (PA6) composites were prepared. The nanotubes were first treated by a volume ratio of 3:1 mixture of concentrated H2SO4/HNO3, and then the γ-aminopropyl-triethoxysilane (KH-550) was carried onto the surface of MWCNTs. Effect of MWCNTs coupling treatment on the mechanical and electrical properties of the MWCNTs/PA6 composites were investigated. The impact strength, tensile strength and modulus of p-MWCNTs (coupling process)/PA6 composites increase by 115.9%, 27.2% and 167.7%, respectively, compared with those of the pure nylon-6 resin. A significant increase of the electrical conductivity of the p-MWCNTs/PA6 composites with respect to the original-MWCNTs and a-MWCNTs/PA6 composites due to the increased compatibility with the matrix due to the formation of an inter face with stronger interconnections.

scholarly journals Titanium carbide MXene: Synthesis, electrical and optical properties and their applications in sensors and energy storage devices

2019 ◽  
Vol 9 ◽  
pp. 184798041882447 ◽  
Author(s):  
Johnson Michael ◽  
Zhang Qifeng ◽  
Wang Danling
Keyword(s):  
Energy Storage ◽  
Electrical Properties ◽  
Titanium Carbide ◽  
Inorganic Compounds ◽  
High Surface ◽  
High Surface Area ◽  
Volume Ratio ◽  
Energy Storage Materials ◽  
Post Processing ◽  
Energy Storage Devices

MXenes have been under a lot of scientific investigation due to the novel characteristics that are inherent to two-dimensional nanostructures. There are a multitude of MXenes being studied and one of the most popular among these would be the titanium carbides. The general formula for titanium carbide is Ti n+ 1C n for the nanosheets produced that have undergone much study in the past few years. These studies include how the etching process affects the final MXene sheet and how the post-processing via heat or combining with polymers and/or inorganic compounds influences the mechanical and electrical properties. It is found that different etching techniques can be used to change the electrical properties of the produced MXenes and different post-processing techniques can be used to further change the properties of the nanosheets. The possible application of the titanium carbide MXenes as chemical sensing and energy storage materials will be briefly discussed. MXene nanosheets show promise in such devices due to their high surface area to volume ratio and their specific surface structure with feasible surface functionalization.

scholarly journals Template assisted nano-structured nickel for efficient methanol oxidation

2021 ◽  
Vol 4 (1) ◽  
pp. 58
Author(s):  
S Mohanapriya ◽  
V Raj
Keyword(s):  
Methanol Oxidation ◽  
Electrocatalytic Activity ◽  
Liquid Crystalline ◽  
Electrochemical Impedance ◽  
High Surface ◽  
Volume Ratio ◽  
Ionic Surfactant ◽  
Processing Conditions ◽  
Catalytic Sites ◽  
Surface Poisoning

Nanoporous nickel has been prepared by electrodeposition using non-ionic surfactant based liquid crystalline template under optimized processing conditions. Physicochemical properties of nanoporous nickel are systematically characterized through XRD, SEM and AFM analyses. Comparison of electrocatalytic activity of nanoporous nickel with smooth nickel was interrogated using cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) analyses. Distinctly enhanced electrocatalytic activity with improved surface poisoning resistance related to nanoporous nickel electrode towards methanol oxidation stems from unique nanoporous morphology. This nanoporous morphology with high surface to volume ratio is highly beneficial to promote active catalytic centers to offer readily accessible Pt catalytic sites for MOR, through facilitating mass and electron transports.

scholarly journals Template assisted nano-structured nickel for efficient methanol oxidation

2021 ◽  
Vol 4 (2) ◽  
Author(s):  
S Mohanapriya ◽  
V Raj
Keyword(s):  
Methanol Oxidation ◽  
Electrocatalytic Activity ◽  
Liquid Crystalline ◽  
Electrochemical Impedance ◽  
High Surface ◽  
Volume Ratio ◽  
Ionic Surfactant ◽  
Processing Conditions ◽  
Catalytic Sites ◽  
Surface Poisoning

Nanoporous nickel has been prepared by electrodeposition using non-ionic surfactant based liquid crystalline template under optimized processing conditions. Physicochemical properties of nanoporous nickel are systematically characterized through XRD, SEM and AFM analyses. Comparison of electrocatalytic activity of nanoporous nickel with smooth nickel was interrogated using cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) analyses. Distinctly enhanced electrocatalytic activity with improved surface poisoning resistance related to nanoporous nickel electrode towards methanol oxidation stems from unique nanoporous morphology. This nanoporous morphology with high surface to volume ratio is highly beneficial to promote active catalytic centers to offer readily accessible Pt catalytic sites for MOR, through facilitating mass and electron transports.

Development of Diclofenac Sodium Releasing Bio-Erodible Polymeric Nanomats

2006 ◽  
Vol 6 (9) ◽  
pp. 3310-3320 ◽  
Author(s):  
A. M. Piras ◽  
L. Nikkola ◽  
F. Chiellini ◽  
N. Ashammakhi ◽  
E. Chiellini
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Release Kinetics ◽  
Diclofenac Sodium ◽  
High Surface ◽  
Active Agent ◽  
Volume Ratio ◽  
Homogeneous Distribution ◽  
Scanning Calorimetry ◽  
Nano Structure

Application of nanofiber-based nanomats in medicine is attractive and thanks to the 3D nano-structure and the high surface to volume ratio they are excellent for local controlled drug delivery. The use of bioactive bioerodible polymers for developing drug delivery nanomats may allow for drug release and targeting control. Objective of the current study was to evaluate the suitability of bioerodible polymeric material based on n-butyl hemiester of [poly(maleic anhydride-alt-2-methoxyethyl vinyl ether)] (PAM14) for the preparation of nanomats for controlled administration of anti-inflammatory, diclofenac sodium (DS) drug. Samples were prepared using different polymer concentrations (5–10%) in either ethanol or acetic acid as solvent. Morphology was investigated by using scanning electron microscopy (SEM). Thermal analysis such as differential scanning calorimetry (DSC) was performed to detect effect on polymer arrangement. DS localization in electrospun nanomats was evaluated by using electron back scattering microanalysis, based on the detection of chlorine, and drug release kinetics was assessed using UV-Vis. Average fiber diameter resulted in the range of 100 nm to 1.0 μm and a homogeneous distribution of the loaded drug into the fibers was observed. The DS release was immediate and despite the preliminary nature of the performed electrospinning experiments, the achieved results appear promising for the future development of a novel system for the controlled and targeted administration of drug and active agent.

scholarly journals The Novel Nanomaterials Based Biosensors and Their Applications

2020 ◽  
Author(s):  
Kübra Gençdağ Şensoy ◽  
Mihrican Muti
Keyword(s):  
Medical Diagnosis ◽  
Polymeric Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
High Surface ◽  
Volume Ratio ◽  
Selective Detection ◽  
The Novel ◽  
Safety Control ◽  
Mechanical And Electrical Properties ◽  
Detection Of Biomolecules

Since the development of the first biosensor reported, biosensor has received considerable attention due to its high selectivity and sensitivity. Biosensors are highly pursued in order to meet the growing demands and challenges in a large number of analytic applications such as medical diagnosis, food safety control, environmental monitoring, or even military defense. Due to the unique physical, chemical, mechanical and electrical properties, nanomaterials have been widely investigated for their ability and used to fabricate sensors. High surface to volume ratio, good stability, excellent electrocatalytic properties of the nanomaterials plays an important role in the sensitive and selective detection of biomolecules. The synthesis of new nanomaterials with different properties is increasingly common in order to improve these counted properties of nanomaterials. This chapter gives an overview of the importance of the development of novel nanomaterials based biosensors technologies. The use of different funtionalized carbon nanomaterilas, metal oxide nanoparticles, metal nanoparticles, polymeric nanoparticles, quantum dots, graphene sheets and other novel nanomaterials in biosensor technology, and their innovations and advantages are discussed.

The Potential of Inline Automated Defect Review of Mechanical Property and Electrical Characterization by AFM

2019 ◽  
Author(s):  
Sang-Joon Cho ◽  
Seong-Oh Kim ◽  
Moses Lee ◽  
Yoonkyoung Lee
Keyword(s):  
Mechanical Property ◽  
High Resolution ◽  
Electrical Properties ◽  
Electrical Characterization ◽  
Industrial Applications ◽  
Characterization Methods ◽  
Mechanical And Electrical Properties ◽  
3D Information ◽  
Non Destructive

Abstract With decreasing device sizes, nanometer-sized defects on the wafer substrates can already limit the performance of the devices. The detection and precise classification of these defects requires additional characterization methods with a resolution in the nanometer range. It is well known that AFM can measure not only surface morphology but also mechanical and electrical properties. However, the versatility of AFM is not fully utilized in industrial applications due to the various limitations. Various limitations include low throughput and tip life in addition to the laborious efforts for finding the defects in inline automated defect review (ADR). In this paper we introduce the ADR AFM with mechanical and electrical characterization capability of defects in addition to high throughput, high resolution, and non-destructive means for obtaining 3D information for nm-scale defect review and classification.

Enhanced microstructure homogeneity and mechanical properties of AZ91–SiC nanocomposites by cyclic closed-die forging

2016 ◽  
Vol 51 (5) ◽  
pp. 681-686 ◽  
Author(s):  
Wei Guo ◽  
Qu-Dong Wang ◽  
Wen-Zhen Li ◽  
Hao Zhou ◽  
Li Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Surface ◽  
Homogeneous Distribution ◽  
Sic Nanoparticles ◽  
Die Forging ◽  
Closed Die Forging ◽  
The Matrix ◽  
Matrix Flow ◽  
High Surface Energy ◽  
Agglomeration Of Nanoparticles

The microstructure and mechanical properties of AZ91–SiC nanocomposites processed by cyclic closed-die forging were investigated. The results showed that much finer grain size and more homogeneous distribution of Mg17Al12 phase and SiC nanoparticles were obtained along with significant improvement in strength and elongation after five passes. During cyclic closed-die forging processing, the agglomeration of nanoparticles disintegrated through kneading effect induced by intense matrix flow, and the nano-sized SiC particles were dispersed uniformly into the matrix. However, a few SiC clusters still existed due to the high surface energy of nanoparticles. Properties enhancement of the composites was mainly attributed to Hall–Petch effect and Orowan strengthening.

scholarly journals The Effect of TiC Additive on Mechanical and Electrical Properties of Al2O3 Ceramic

2018 ◽  
Vol 8 (12) ◽  
pp. 2385 ◽  
Author(s):  
Sergey Grigoriev ◽  
Marina Volosova ◽  
Pavel Peretyagin ◽  
Anton Seleznev ◽  
Anna Okunkova ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Electrical Properties ◽  
Electrical Discharge Machining ◽  
Ceramic Composites ◽  
Homogeneous Distribution ◽  
Second Phase ◽  
Mechanical And Electrical Properties ◽  
Plasma Sintering ◽  
Cutting Inserts ◽  
Materials Used

In this study the influence of TiC content on the mechanical and electrical properties of Al2O3-TiC composites containing 30 and 40 vol.% TiC were investigated. The Vickers hardness and fracture toughness of the composites increased with the addition of TiC phase. The composite with 40 vol.% TiC showed the highest flexural strength (687 ± 39 MPa), fracture toughness (7.8 ± 0.4 MPa·m1/2) and hardness (22.3 ± 0.3 GPa) with a homogeneous distribution of the second phase within the ceramic matrix. Besides enhanced mechanical properties, it was found that ceramic composites with more than 30 vol.% TiC fabricated by the spark plasma sintering possess sufficient electrical conductivity for electrical discharge machining as well. Therefore, they do not limit the flexibility of the shape, and any intricate parts can be easily made with these composites which can be recommended for the production of cutting inserts in the tools for machining of superhard hardened steels, hard-to-machine materials, composites and other materials used in mechanical engineering.

scholarly journals Sintering of Cu-Al2O3 nano-composite powders produced by a thermochemical route

2007 ◽  
Vol 72 (11) ◽  
pp. 1115-1125 ◽  
Author(s):  
Marija Korac ◽  
Zoran Andjic ◽  
Milos Tasic ◽  
Zeljko Kamberovic
Keyword(s):  
Electrical Properties ◽  
Ion Beam ◽  
Analytical Electron Microscopy ◽  
Copper Matrix ◽  
Homogeneous Distribution ◽  
Composite Powders ◽  
Nano Composite ◽  
Mechanical And Electrical Properties ◽  
Thermochemical Method

This paper presents the synthesis of nano-composite Cu-Al2O3 powder by a thermochemical method and sintering, with a comparative analysis of the mechanical and electrical properties of the obtained solid samples. Nano-crystalline Cu-Al2O3 powders were produced by a thermochemical method through the following stages: spray-drying, oxidation of the precursor powder, reduction by hydrogen and homogenization. Characterization of powders included analytical electron microscopy (AEM) coupled with energy dispersive spectroscopy (EDS), differential thermal and thermogravimetric (DTA-TGA) analysis and X-ray diffraction (XRD) analysis. The size of the produced powders was 20-50 nm, with a noticeable presence of agglomerates. The composite powders were characterized by a homogenous distribution of Al2O3 in a copper matrix. The powders were cold pressed at a pressure of 500 MPa and sintered in a hydrogen atmosphere under isothermal conditions in the temperature range from 800 to 900 ?C for up to 120 min. Characterization of the Cu-Al2O3 sintered system included determination of the density, relative volume change, electrical and mechanical properties, examination of the microstructure by SEM and focused ion beam (FIB) analysis, as well as by EDS. The obtained nano-composite, the structure of which was, with certain changes, preserved in the final structure, provided a sintered material with a homogeneous distribution of dispersoid in a copper matrix, with exceptional effects of reinforcement and an excellent combination of mechanical and electrical properties.

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