scholarly journals Plasma-Assisted Synthesis of Multicomponent Nanoparticles Containing Carbon, Tungsten Carbide and Silver as Multifunctional Filler for Polylactic Acid Composite Films

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 991
Author(s):  
Nichapat Boonyeun ◽  
Ratana Rujiravanit ◽  
Nagahiro Saito
Keyword(s):  
Tungsten Carbide ◽  
Polylactic Acid ◽  
Ag Nanoparticles ◽  
Composite Films ◽  
Spherical Shape ◽  
Antibacterial Activities ◽  
Atomic Ratio ◽  
Average Particle ◽  
Particle Sizes ◽  
Sem Images

Multicomponent nanoparticles containing carbon, tungsten carbide and silver (carbon-WC-Ag nanoparticles) were simply synthesized via in-liquid electrical discharge plasma, the so-called solution plasma process, by using tungsten electrodes immersed in palm oil containing droplets of AgNO3 solution as carbon and silver precursors, respectively. The atomic ratio of carbon:W:Ag in carbon-WC-Ag nanoparticles was 20:1:3. FE-SEM images revealed that the synthesized carbon-WC-Ag nanoparticles with particle sizes in the range of 20–400 nm had a spherical shape with a bumpy surface. TEM images of carbon-WC-Ag nanoparticles showed that tungsten carbide nanoparticles (WCNPs) and silver nanoparticles (AgNPs) with average particle sizes of 3.46 nm and 72.74 nm, respectively, were dispersed in amorphous carbon. The carbon-WC-Ag nanoparticles were used as multifunctional fillers for the preparation of polylactic acid (PLA) composite films, i.e., PLA/carbon-WC-Ag, by solution casting. Interestingly, the coexistence of WCNPs and AgNPs in carbon-WC-Ag nanoparticles provided a benefit for the co-nucleation ability of WCNPs and AgNPs, resulting in enhanced crystallization of PLA, as evidenced by the reduction in the cold crystallization temperature of PLA. At the low content of 1.23 wt% carbon-WC-Ag nanoparticles, the Young’s modulus and tensile strength of PLA/carbon-WC-Ag composite films were increased to 25.12% and 46.08%, respectively. Moreover, the PLA/carbon-WC-Ag composite films possessed antibacterial activities.

scholarly journals Porous V2O5/TiO2 Nanoheterostructure Films with Enhanced Visible-Light Photocatalytic Performance Prepared by the Sparking Method

Molecules ◽  
2020 ◽  
Vol 25 (15) ◽  
pp. 3327
Author(s):  
Porntipa Pooseekheaw ◽  
Winai Thongpan ◽  
Arisara Panthawan ◽  
Ekkapong Kantarak ◽  
Wattikon Sroila ◽  
...  
Keyword(s):  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Photocatalytic Performance ◽  
Composite Films ◽  
Cost Effective ◽  
Atomic Ratio ◽  
Pure Tio2 ◽  
Sem Images ◽  
Transmission Electron ◽  
Highly Correlated

Porous V2O5/TiO2 nanoheterostructure films with different atomic ratios of Ti/V (4:1, 2:1, 1:1, and 1:2) were synthesized by a sparking method for the first time. The sparking method, which is a simple and cost-effective process, can synthesize highly porous and composite films in one step. Field-emission scanning electron microscope (FE-SEM) images revealed the porosity morphology of all prepared samples. V2O5/TiO2 nanoheterostructure films were confirmed by Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS). The secondary particle size and band gap of the samples were highly correlated to the V2O5 proportion, resulting in enhanced visible-light absorbance. V2O5/TiO2 nanoheterostructure films at an atomic ratio of 1:1 showed the highest photocatalytic performance, which improved the degradation rate up to 24% compared to pure TiO2 film. It is believed that the formed nanoheterostructure and greater portion of V4+ ions are reflected by this ratio.

scholarly journals Green Synthesis of Silver Nanoparticles Using Terminalia Bellirica Leaves Extract

2021 ◽  
Vol 16 (2) ◽  
Author(s):  
Rashmi Rawat ◽  
M. C. Purohit ◽  
Mahender Singh ◽  
Ankit S. Bartwal
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Ag Nanoparticles ◽  
Metallic Nanoparticles ◽  
Skin Diseases ◽  
Average Particle Size ◽  
Spherical Shape ◽  
Average Particle ◽  
Tem Analysis ◽  
Terminalia Bellirica

Nowadays, for green synthesis, different parts of plant extracts are being used for the synthesis of metallic nanoparticles. Green routes for the synthesis of metallic nanoparticles are most favorable method over conventional methods. In this study, we have synthesized Ag nanoparticles from Terminalia bellirica aqueous leaves extract with AgNO3 solution. Recently, silver nanoparticles are being used for their beneficial effects on human health. It has been reported that it helps in lowering in cholesterol, blood pressure, thirst, pile, skin diseases and treatment of diabetes. Ag nanoparticles were characterized by UV-Vis spectrophotometer, XRD, TEM and FTIR techniques. It was found that Ag+ ion reduced into Ag0 and showed absorption band at 447 nm. X-Ray Diffraction for structural determination confirms the crystalline Ag nanoparticles. TEM analysis confirms the average particle size is less than 30 nm with spherical shape. FTIR spectra confirms the presence of active biomolecules (alcohols, phenols, proteins and nitro compounds) of plant leaves extract which played a key role in formation of Ag nanoparticles.

scholarly journals Electrospun synthesis of silver/poly (vinyl alcohol) nano-fibers: investigation antibacterial activity and flame retardant property

2021 ◽  
Author(s):  
Sara Azarakhsh ◽  
Hamed Bahiraei ◽  
Gholamhosain Haidari ◽  
Davood Ghanbar
Keyword(s):  
Polyvinyl Alcohol ◽  
Flame Retardant ◽  
Ag Nanoparticles ◽  
Average Particle Size ◽  
Water Soluble ◽  
Poly Vinyl Alcohol ◽  
Average Particle ◽  
Sem Images ◽  
Water Soluble Polymer ◽  
Nano Fiber

Abstract Polyvinyl alcohol (PVA) and Ag nanoparticles-embedded polyvinyl alcohol (Ag/PVA) nano-fibers have been synthesized successfully via the electro-spinning technique at room temperature. XRD patterns confirmed the presence of Ag nanoparticles in the electro-spinning PVA nano-fibers. FE-SEM images displayed that silver nanoparticles with an average particle size of 32 nm are uniformly dispersed in PVA nano-fibers. Also, the average diameter of Ag/PVA nano-fibers was estimated to be 142 nm. The EDX analysis of Ag/PVA nano-fiber determined the aggregation of Ag nanoparticles in the range of polymer nano-fibers. The antibacterial property of Ag/PVA nano-fiber for inhibition of Escherichia coli (E-coli) growth was approved. Since polyvinyl alcohol is a biocompatible and water-soluble polymer, it can be considered as unique candidate for the preparation of wound dressing nano-fibers. It is also found that the nontoxic nanostructures can appropriately enhance both flame retardant and thermal stability properties of the Ag/PVA matrix. These results show that the Ag/PVA nano-fibers may find practical applications as self-reinforced medical devices and tissue-engineering scaffolds.

scholarly journals Preparation and Characterization of PVA-Cellulose Micro Crystal Composite Film from Jute fiber

2021 ◽  
Author(s):  
Md. Zahid Hasan ◽  
Yeasin Arafat ◽  
M. Mahbubul Bashar ◽  
Md. Nabi Newaz Niloy ◽  
Md Imranul Islam ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Composite Films ◽  
Particle Diameter ◽  
Jute Fiber ◽  
Average Particle ◽  
Sem Images ◽  
Oh Groups ◽  
Ft Ir ◽  
Higher Temperature ◽  
Ft Ir Spectroscopy

Abstract Herein, the microcrystalline cellulose (MCC) was obtained from jut fiber by ammonium persulfate (APS) oxidation process and thus polyvinyl alcohol (PVA) composite films were prepared by the reinforcement of MCC in a solution casting method. The surface chemistry, thermal properties and surface morphology of MCC and PVA-MCC composite films were studied by FT-IR spectroscopy, thermogravimetric analyzer and scanning electron microscopy. The SEM images confirmed the rod like MCC with average particle diameter 4.6 µm and length in 48.4 µm. The FT-IR spectroscopy revealed the complete removal of lignin and hemicellulose from jute fiber. A peak at 1730 cm− 1 was introduced in MCC due to oxidation with APS. The absorption peak of –OH groups in PVA-MCC composite films were shifted, somewhat disappeared and weakened due to the intra and inter molecular hydrogen bonding of MCC and OH groups in PVA. Thermogravimetric analysis expressed the thermal behavior of MCC and PVA-MCC composite films. Initially the thermal stability of PVA-MCC composite films was lower than the pristine MCC but at higher temperature (> 300℃) it showed better stability indicating the applicability of the composite at higher temperature.

scholarly journals Synthesis of the platinum particle with the pH variation for the particle size control

2021 ◽  
Vol 2145 (1) ◽  
pp. 012038
Author(s):  
P Thongnopkun ◽  
W Kitprapot
Keyword(s):  
Particle Size ◽  
Chemical Reduction ◽  
Intrinsic Value ◽  
Size Control ◽  
Spherical Shape ◽  
Platinum Particle ◽  
Particle Sizes ◽  
Sem Images ◽  
Ph Variation ◽  
Reduction Methods

Abstract Platinum is a precious metal widely used in the jewelry industry due to its property and intrinsic value. The different particle sizes of platinum can be applied in various applications, especially for jewelry production. In the present article, submicron, and nano-sized platinum particle sizes were synthesized through simple chemical reduction methods and the effect of pH variation was revealed. The scanning electron microscope (SEM) images showed that the pH variations give rise to significant changes of the obtained particle size. The size of platinum particle was decreased from submicron to nanoscale while the pH was increased. The UV-Vis spectra indicated the maximum absorption at 220 nm confirming the spherical shape of the platinum particle. The FT-IR spectroscopy was used to analyze the residuals from the synthesis. The result showed that there is no indication of residual in the synthesized particle. Additionally, this synthesis can provide stability in terms of size and shape, as well as high production yield.

Fabrication and Properties of Green Cellulose Nanofibers/Polylactic Acid Composites

2012 ◽  
Vol 174-177 ◽  
pp. 885-892
Author(s):  
Ming Zhu Li ◽  
Da Gang Li ◽  
Qiao Yun Deng ◽  
Dong Liang Lin ◽  
Yu Mei Wang
Keyword(s):  
Polylactic Acid ◽  
Coefficient Of Thermal Expansion ◽  
Cellulose Nanofibers ◽  
Composite Films ◽  
Casting Method ◽  
Sem Images ◽  
Dichloromethane Solution ◽  
Solution Casting Method ◽  
Ft Ir ◽  
Effective Reinforcement

This paper reports the preparation for cellulose nanofibers (CNFs) and fabricates CNFs reinforced polylactic acid (PLA) composites with the goal of making sustainable ’green-composites’. CNFs were isolated from wood powder by acid and alkali processing combined with mechanical treatment，containing grinding treatment and high-pressure homogenizing. The nanocomposites were prepared by incorporating 1wt% of the CNFs into the PLA matrix by a dichloromethane solution casting method. Fourier transform infrared spectroscopy（FT-IR）and scanning electron microscopy (SEM) were studied to see the structure of CNFs. The FT-IR indicates that the original molecular structure of cellulose is maintained even after matrix components removal and different mechanical treatments and the SEM images show that the aspect ratio of CNFs is over 1,200. The mechanical properties and the coefficient of thermal expansion (CTE) of the neat PLA and CNFs/PLA composite films were investigated. The results indicate that tensile strength and modulus of PLA are improved and the CTE of PLA is decreased with the addition of CNFs. From the results, CNFs show considerable potential as an effective reinforcement for high quality specialty applications of PLA.

scholarly journals Production, Optimization and Characterization of Polylactic Acid Microparticles Using Electrospray with Porous Structure

2021 ◽  
Vol 11 (11) ◽  
pp. 5090
Author(s):  
Muhammed Enes Tasci ◽  
Berna Dede ◽  
Eray Tabak ◽  
Aybuke Gur ◽  
Rabia Betul Sulutas ◽  
...  
Keyword(s):  
Polylactic Acid ◽  
Spherical Shape ◽  
Particle Morphology ◽  
Average Diameter ◽  
Solution Concentration ◽  
Single Step ◽  
Production Optimization ◽  
Sem Images ◽  
Micron Size ◽  
Polymeric Microparticles

Polymeric microparticles with controlled morphologies and sizes are being studied by researchers in many applications, such as for drug release, healthcare and cosmetics. Herein, spherical and porous polymeric microparticles of different sizes and morphologies by electrospray technique have been developed as a viable alternative. In this work, polylactic acid (PLA) microparticles with a spherical shape and porous morphology were successfully produced via an electrospray technique in a single step. Molecular interactions between the components and the effect of parameters, such as varying solvent compositions, flow rates and voltage on microparticle morphology, were investigated over the particle formation. It was observed that the type of solvents used is the most effective parameter in terms of particle morphology, size and distribution. When the optical microscopy and SEM images of the microparticles were examined, 3 wt.% PLA in dichloromethane (DCM) solution concentration with an applied voltage of 18 kV and a flow rate of 20 µL/min was found to be the optimum parameter combination to achieve the desired spherical and porous micron-size particles. The average diameter of the particles achieved was 3.01 ± 0.58 µm. DCM was found to be a more suitable solvent for obtaining microparticles compared to the other solvents used. Finally, particles that are obtained by electrospraying of PLA–DCM solution are porous and monodisperse. They might have excellent potential as a carrier of drugs to the targeted sides and can be used in different biomedical applications.

Synthesis and Characterization of Cassava Bark Nanoparticles

MRS Advances ◽  
2018 ◽  
Vol 3 (42-43) ◽  
pp. 2519-2526 ◽  
Author(s):  
F.O. Kolawole ◽  
S.K. Kolawole ◽  
J.O. Agunsoye ◽  
S.A. Bello ◽  
J.A. Adebisi ◽  
...  
Keyword(s):  
Particle Size ◽  
Trace Element ◽  
Size Distribution ◽  
Particle Distribution ◽  
Average Particle Size ◽  
Synthesis And Characterization ◽  
Average Particle ◽  
Particle Sizes ◽  
Sem Images

AbstractSynthesis and characterization of cassava bark nanoparticles (CBNPs) was carried out using ball milling at 36, 48, 60 and 72 hours. The morphology study was done using SEM and the Gwyddion software was used to determine the particle sizes from the SEM images. The particle distribution for the un-milled cassava bark (CB) was between 1.25 + 0.06 to 19.92 + 1.00 µm, while after milling for 36, 48, 60 and 72 hours the average particle size were 4.07 + 0.20, 4.00 + 0.20 µm, 80.90 + 4.05, 74.50 + 3.73 nm respectively. 13.68 + 0.68 nm was obtained by XRD using Scherrer equation after milling for 72 hours and the XRD results revealed the presence of compounds such as SiO2, CaCO3 and KAlSi3O8. TEM was used to determine nanoparticle size distribution after milling for 72 hours and the particle size ranged from 9.73 + 0.49 to 114.60 + 5.73 nm for cassava bark nanoparticles (CBNPs), EDX results showed trace element of Si, Ca, K, Fe, Al, O in the CB milled for 72hours.

Upconversion nanoparticle–Ag@C@Ag composite films for rapid temperature sensing

CrystEngComm ◽  
2021 ◽  
Author(s):  
Hu Huang ◽  
Lingqiong Wu ◽  
Shengbin Cheng ◽  
Xiaofeng Wu ◽  
Shiping Zhan ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Ag Nanoparticles ◽  
Response Rate ◽  
Composite Films ◽  
Temperature Sensing ◽  
Upconversion Nanoparticles ◽  
Rapid Temperature

The response rate of optical temperature sensing of upconversion nanoparticles is significantly improved by coupling with Ag@C@Ag nanoparticles which have excellent thermal conductivity.

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