scholarly journals Investigation on the Preparation and Properties of CMC/magadiite Nacre-Like Nanocomposite Films

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1378
Author(s):  
Mingliang Ge ◽  
Yueying Li ◽  
Yinye Yang ◽  
Yanwu Wang ◽  
Guodong Liang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Nanocomposite Film ◽  
Xrd Analysis ◽  
Nanocomposite Films ◽  
Inorganic Filler ◽  
Material Research ◽  
X Ray Diffraction ◽  
Great Probability ◽  
Layer Spacing

The layered hydrated sodium salt-magadiite (MAG), which has special interpenetrating petals structure, was used as a functional filler to slowly self-assemble with sodium carboxy-methylcellulose (CMC), in order to prepare nacre-like nanocomposite film by solvent evaporation method. The structure of prepared nacre-like nanocomposite film was characterized by Scanning Electron Microscope (SEM) and X-ray diffraction (XRD) analysis; whereas, it was indicated that CMC macromolecules were inserted between the layers of MAG to increase the layer spacing of MAG by forming an interpenetrating petals structure; in the meantime, the addition of MAG improved the thermal stability of CMC. The tensile strength of CMC/MAG was significantly improved compared with pure CMC. The tensile strength of CMC/MAG reached the maximum value at 1.71 MPa when the MAG content was 20%, to maintaining high transparency. Due to the high content of inorganic filler, the flame retarding performance and the thermal stability were also brilliant; hence, the great biocompatibility and excellent mechanical properties of the bionic nanocomposite films with the unique interpenetrating petals structure provided a great probability for these original composites to be widely applied in material research, such as tissue engineering in biomedical research.

Synthesis and Characterization of TiO2Nanoparticles with Polycarbonate and Investigation of its Mechanical Properties

2017 ◽  
Vol 16 (05n06) ◽  
pp. 1750012 ◽  
Author(s):  
Farhad Jahantigh ◽  
Mehdi Nazirzadeh
Keyword(s):  
Mechanical Properties ◽  
Weight Fraction ◽  
Xrd Analysis ◽  
Tensile Tests ◽  
Nanocomposite Films ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Stability Of

In this project, nanocomposite films were prepared with different Titanium dioxide (TiO2) percentages. Properties of polycarbonate (PC) and PC–TiO2nanocomposite films were studied by X-ray diffraction (XRD) analysis and Fourier transform infrared (FTIR) spectroscopy. The structure of samples was studied by XRD. The mechanical properties of PC–TiO2nanocomposite films were investigated by conducting tensile tests and hardness measurements. Thermal stability of the nanocomposites was studied by thermogravimetric analysis (TGA) method. The elastic modulus of the composite increased with increasing weight fraction of nanoparticles. The microhardness value increases with increasing TiO2nanoparticles. The results of tensile testing were in agreement with those of micro-hardness measurements. In addition, TGA curves showed that nanocomposite films have higher resistance to thermal degradation compared to polycarbonate. There are many reports related to the modification of polycarbonate films, but still a systematic study of them is required.

scholarly journals Effect of Acid and Alkaline Environment on Dynamic Strength and Porosity Characteristics of Bursting Liability Coal

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Lei Li ◽  
Jiangbo Fan ◽  
Ningning Liu ◽  
Shuang Gong ◽  
Daming Yang
Keyword(s):  
Tensile Strength ◽  
Dynamic Strength ◽  
Xrd Analysis ◽  
Acidic Environment ◽  
Shear Cracks ◽  
X Ray Diffraction ◽  
Alkaline Environment ◽  
Surface Micromorphology ◽  
Alkaline Environments ◽  
Split Hopkinson

In order to investigate the influence of acid and alkaline environment on dynamic strength and porosity characteristics of bursting liability coal, scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis were used to compare the microstructures of coal with different bursting liabilities. A split Hopkinson bar (SHPB) was used to test the dynamic compressive strength and tensile strength of coal samples with different bursting liabilities. The results show that the surface micromorphology and structure characteristics of coal samples with different bursting liabilities are representatives, which can be used as an auxiliary basis to determine the bursting liability of coal seam. The microstructure of coal with strong bursting liability is characterized by mylonitic, fragmentary, and brecciated structure, and the microstructure is diverse and complex. However, the microstructure of no bursting liability coal is single and uniform. Coal with strong bursting liability shows tensile, compressive, and shear cracks produced by tectonic action, and the distribution of cracks is complicated. The development of fissures is greatly affected by the degree of coal metamorphism, organic components, minerals, and other factors. Under acidic and alkaline environments, the decrease amplitude of tensile strength of coal is obviously larger than that in neutral solution, which indicates that under the action of acid-based solution soaking, the easily soluble minerals in coal react with hydrogen ions and hydroxyl ions in solution obviously. Porosity increment in acidic environment is much larger than that in alkaline and neutral environments. The strong bursting liability coal is more sensitive to acidic environment, while the no bursting liability coal is more sensitive to alkaline environment.

Synthesis of (PVA/PEG: ZnO and Co3O4) Nanocomposites: Characterization and Gamma Ray Studies

2021 ◽  
Vol 19 (4) ◽  
pp. 47-56
Author(s):  
Hanan H. Jassim ◽  
Fouad Sh. Hashim
Keyword(s):  
Gamma Ray ◽  
Polymer Nanocomposite ◽  
Xrd Analysis ◽  
Polymeric Matrix ◽  
Nanocomposite Films ◽  
X Ray Diffraction ◽  
Field Frequency ◽  
Electric Field Frequency ◽  
Solution Cast ◽  
Ft Ir

Polymer blend (PVA/PEG) and its nanocomposites with constant ZnO and different ratios of Co3O4 NPs films synthesized using solution cast technique. The obtained products were identified by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Optical characteristics have been studied by UV-visible spectroscopy. FT-IR spectra confirmed of the produce the functional groups present in polymer nanocomposite systems. XRD analysis confirmed the formation nanocomposite films more crystalline from the polymeric matrix. SEM showed a powerful dispersion of ZnO and Co3O4 NPs on the surface of the polymeric matrix. The D.C electrical conductivity of the polymeric system (PVA/PEG) increases after addition of and Co3O4 NPs for all temperatures under test. D.C measurements indicate that all films having one activation energy, and that its value increases with the increase in the percentage of addition. The A.C electrical properties showed that the dielectric constant and dielectric loss for all films decreases with the increase of the electric field frequency, and that its values increase with the increasing of the wt.% of Co3O4 NPs. The (PVA/PEG) and its nanocomposite with ZnO and different wt.% of Co3O4 films have good linear attenuation coefficients for gamma ray radiation.

scholarly journals Characterization of a Novel Nanocomposite Film Based on Functionalized Chitosan–Pt–Fe3O4 Hybrid Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1275
Author(s):  
Sangeeta Kumari ◽  
Raj Pal Singh ◽  
Nayaku N. Chavan ◽  
Shivendra V. Sahi ◽  
Nilesh Sharma
Keyword(s):  
Nanocomposite Film ◽  
Biomedical Applications ◽  
Physical Property Measurement System ◽  
Physical Property ◽  
Nanocomposite Films ◽  
Hybrid Nanoparticles ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron

The development of organic—inorganic hybrids or nanocomposite films is increasingly becoming attractive in light of their emerging applications. This research focuses on the formation of a unique nanocomposite film with enhanced elasticity suitable for many biomedical applications. The physical property measurement system and transmission electron microscopy were used to analyze Pt–Fe3O4 hybrid nanoparticles. These nanohybrids exhibited magnetic effects. They were further exploited to prepare the nanocomposite films in conjunction with a chitosan-g–glycolic acid organic fraction. The nanocomposite films were then examined using standard techniques: thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, and atomic force microscopy. Tensile strength testing demonstrated a significantly greater elastic strength of these nanocomposite films than pure chitosan films. The water absorption behavior of the nanocomposites was evaluated by measuring swelling degree. These nanocomposites were observed to have substantially improved physical properties. Such novel nanocomposites can be extended to various biomedical applications, which include drug delivery and tissue engineering.

scholarly journals Physico-Mechanical Study of CMC/BFO/PoPD Nanocomposite Films Reinforced with Cellulose Nanocrystals (CNCMCC) for Effective Photocatalytic Removal of Methyl Orange

2021 ◽  
Vol 5 (6) ◽  
pp. 142
Author(s):  
Nurul Hidayu Nazri ◽  
Yogesh Kumar ◽  
Mohd Amirul Ramlan ◽  
Mohammad Haafiz Mohammad Kassim ◽  
Md. Sohrab Hossain ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Composite Film ◽  
Cellulose Nanocrystals ◽  
Nanocomposite Film ◽  
Structural Integrity ◽  
Bismuth Ferrite ◽  
Nanocomposite Films ◽  
Photocatalytic Removal

The present study was conducted to develop a nanocomposite film of carboxymethyl cellulose (CMC) reinforced with cellulose nanocrystals isolated from microcrystalline cellulose (CNCMCC) in the presence of bismuth ferrite (BFO)/poly-o-phenylenediamine (PoPD). The physicochemical properties, the mechanical and thermal stability, and its photocatalytic activity towards the removal of methyl orange (MO) were determined. Results show that the integration of CNCMCC into the CMC matrix enhanced the mechanical strength of the film. The tensile strength (TS) of the nanocomposite film increased from 0.205 to 0.244 MPa, while elongation at break (EB) decreased from 201.44 to 168.78% in the presence of 20 wt.% of CNCMCC. The incorporation of CNCMCC in the CMC matrix substantially enhanced the nanocomposite’s thermal stability from 181.16 to 185.59 °C and decreased the degradation residue from 72.64 to 63.16%. The determination of the photocatalytic activity of the CMC/CNCMCC/BFO/PoPD composite film revealed the removal of methyl orange (MO) of 93.64% with high structural integrity after 3 h of treatment. Thus, the isolated CNCMCC-reinforced CMC/BFO/PoPD composite film can be used as a photocatalyst for the removal of organic pollutants from wastewater, including the methyl orange.

scholarly journals Mechanical, Thermal and Electromagnetic Shielding Effectiveness of MWCN-ABS Films

2021 ◽  
Author(s):  
R. B. Jagadeesh Chandra ◽  
B. Shivamurthy ◽  
M. Sathish Kumar ◽  
B. H. S. Thimmappa
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Petri Dish ◽  
Nanocomposite Films ◽  
Heating Process ◽  
Shielding Effectiveness ◽  
X Band ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractThe multi-walled carbon nanotubes (MWCNTs) and the poly(acrylonitrile-co-butadiene-co-styrene) (ABS) granulates are dispersed in acetone separately using a magnetic stirrer followed by ultrasonication. Further, both the solutions were mixed with magnetic stirring followed by ultrasonication. Neat-ABS film, 0.25 wt%, 0.5 wt% and 1 wt% of MWCNT-ABS nanocomposite films of the average thickness of 140 µm are fabricated by the solution molding using a petri dish, followed by room temperature curing and further hot compression to maintain uniform thickness. The tensile properties, thermal stability, electrical conductivity, and EMSE of all films are investigated. The results indicate that the addition of MWCNTs to ABS enhanced the mechanical properties and electrical conductivity, thermal stability, and EMSE. The 0.25 wt% MWCNT-ABS nanocomposite films show attractive mechanical, electrical, thermal, and EMSE as compared to neat-ABS films. More than 0.25 wt% MWCNTs in the ABS matrix deteriorates the tensile strength. However, 0.5 wt% MWCNT-ABS nanocomposites exhibit better tensile strength, Young’s modulus, electrical conductivity, and EMSE than neat-ABS. In this research, we used a low quantity of MWCNTs and followed a one-time heating process in the entire fabrication, and produced MWCNT-ABS nanocomposite films with reasonable properties. Hence, this may be one of the options to produce nanocomposites suitable for EMS materials. We recommend that these films may be used as interlayers to develop an X-band range electromagnetic wave shielding material.

STUDY OF PROCESSING AND MECHANICAL BEHAVIOR OF PP/CLAY NANOCOMPOSITES PREPARED BY MELT BLENDING

2012 ◽  
Vol 05 ◽  
pp. 536-544
Author(s):  
SAREH MOSLEH SHIRAZI ◽  
KAMAL JANGHORBAN
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Clay Nanocomposites ◽  
Test Results ◽  
Melt Blending ◽  
X Ray Diffraction ◽  
X Ray ◽  
Good Thermal Stability ◽  
Wear Rates ◽  
Tga Analysis

In this research, the melt blending technique was used to prepare various polypropylene (PP) based nanocomposites containing 1,3,5,7 wt% montmorillonite (MMT). A commercial organoclay (denoted K-10) served as the filler for PP matrix and the polypropylene grafted maleic anhydride (PP-g-MA) was used as compatibalizer. The morphology of the nanocomposites was studied by X-ray diffraction (XRD), results of which showed that the nanocomposites are best described as intercalated-exfoliated systems. PP/MMT nanocomposites showed good thermal stability in the TGA analysis. Introducion of ~ 3% MMT in the nanocomposites increased the onset temperature of the degradation by 27.5 °C compared to that of pure PP. Test results showed that PP/clay nanocomposites had an enhanced tensile strength, hardness and decreased wear rates.

scholarly journals The The research to improve the mechanical properties and the water barrier properties of polyvinyl ancol film by graphen oxide

2020 ◽  
Vol 4 (2) ◽  
pp. First
Author(s):  
Nguyen Tuong Vy ◽  
Le Ha Vu Duy
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Young Modulus ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Oxide Material ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Good Thermal Stability ◽  
Modified Hummers Method

In this study, graphene oxide (GO) is synthesized by a modified Hummers method, Polyvinyl alcohol (PVA) films and PVA/ GO nanocomposite films are prepared by casting stable aqueous mixed solutions. X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM) showed that there were a good compatibility and dispersion of graphene oxide (GO) on PVA matrix. In addition, nanocomposite films reinforced graphene oxide with the content of only 0.6 % phr have had 10.11% higher tensile strength, 12.24 % greater Young modulus, and significantly reduced water permeability during 4 hours of continuous immersion. Nanocomposite films maintained good thermal stability despite being added with graphene oxide, a material that is considered to have low thermal stability that easily decomposes below 200 oC, so thermal gravimetric analysis diagram (TGA) of PVA/ GO almost did not show a change compared to the neat PVA film. Initial results show that the efficiency of dispersing and reinforcing graphene oxide material on PVA resins has ameliorated the drawbacks of this polymer and contributed to extending the application of PVA in many areas. This has also reached closer to the goal of cleaning the environment by replacing non-biodegradable polymer sources with more friendly polymers.

scholarly journals Preparation and characterization of nanocellulose from sugarcane bagasse

2020 ◽  
Vol 10 (3) ◽  
pp. 5675-5678
Keyword(s):  
Thermal Stability ◽  
Particle Size ◽  
Acid Hydrolysis ◽  
Sugarcane Bagasse ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Hydrolysis Time ◽  
Chemical Treatments ◽  
Thermal Stability Of

Nanocellulose (NC) was extracted from sugarcane bagasse (SCB) by acid hydrolysis. Alkalization and bleaching were used to treat SCB before the acid hydrolysis. The hydrolysis was carried out at 45 and 60℃ for 90 and 180 min. Chemical structure, crystallinity and thermal stability of the materials were studied using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) analysis and thermogravimetric analysis (TGA), respectively. Morphology and particle size of nanocellulose were also studied using field emission scanning electron microscope (FE-SEM). FTIR results confirmed that lignin and hemicellulose were eliminated after alkali and bleaching treatments. These chemical treatments resulted in an improvement in the crystallinity and thermal stability of SCB. Sphere shape nanocellulose particles were observed by FE-SEM. With increasing hydrolysis time and temperature, the crystallinity of nanocellulose was increased but particle size and thermal stability were decreased.

scholarly journals Mechanical and Barrier Properties of PVP-Carbon Dot Nanocomposite Films

2019 ◽  
Vol 20 (2) ◽  
pp. 49-56
Author(s):  
Ahmad Sjahriza ◽  
Zainal Alim Mas’ud ◽  
Komar Sutirah
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Citric Acid ◽  
Melting Process ◽  
Barrier Properties ◽  
Single Step ◽  
Nanocomposite Films ◽  
Carbon Dot ◽  
Microwave Process ◽  
Water Vapour Barrier

This research reported carbon dot were synthesized form citric acid and urea through a single step microwave process and Poly Vinyl Pirrolidone (PVP) films composited by carbon dot were prepared. The effects of different composition carbon dots  on mechanical strength of films and water vapour barrier were evaluated. Highest mechanical yielded composite film were analyzed their thermal stability. Average of carbon dot diameter was found 90.61 nm and polydispersity indice 0.396. Different composition carbon dot exhibit significant improvement in tensile strength and modulus. Water permeablity of films varieate with content of carbon dot. The presence of carbon dot had a negligible effect on Tg of film and show melting process.

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