scholarly journals Fabrication and Characterisation of Titanium Dioxide (Tio2)/PVA Nanofibre Composites using Electrospinning

2019 ◽  
Vol 7 (4.14) ◽  
pp. 348
Author(s):  
N. D.N. Affandi ◽  
L. Y. Chin ◽  
F. Fadil ◽  
F. A. Azhar
Keyword(s):  
Titanium Dioxide ◽  
Polyvinyl Alcohol ◽  
Research Work ◽  
Fibre Diameter ◽  
Control Sample ◽  
Morphological Structure ◽  
Nano Particles ◽  
Membrane Area ◽  
Membrane Surfaces ◽  
Pva Solutions

A study on the formation of titanium dioxide (TiO2)/ polyvinyl alcohol (PVA) nanofibres has been investigated in the research work. In the study, the TiO2/PVA solutions were prepared at different concentrations ranging from 1wt% to 10wt%. The PVA solution without TiO2 was used as control sample in the study. Each solution was extruded using electrospinning at different voltages to form long and continuous nanofibres. The fibres were then characterised for morphological structures, fibre diameter and membrane area. The result shows that control sample of PVA nanofibres formed beads on the fibre surfaces. The addition of TiO2 in PVA was found to reduce the bead formation. The clumps of TiO2 nanoparticles were observed and were also confirmed with the EDX mapping. In addition, the electrospinning parameters affect the formation of TiO2/PVA nanofibers. At 15 kV, the resultant fibre diameter increases from 153 ± 23 nm to 191 ± 26 nm when the TiO2 concentration was further increased from 1wt% to 10wt%. The morphological structure of TiO2/PVA nanofibres varies depending on applied voltages and concentrations used. The membrane area of TiO2/PVA nanofibers is approximately 187 cm2 for 1wt% of TiO2. From the study, it shows that an optimalconcentration to produce TiO2/ PVA nanofibers is 10wt%. At 10wt%, no beads were observed on the fibre and the TiO2 nano-particles were uniformly distributed on the membrane surfaces.  

Effect of Molecular Weight on Morphological Structure of Electrospun PVA Nanofibre

2015 ◽  
Vol 1134 ◽  
pp. 203-208
Author(s):  
Nur Athirah Abdullah@Shukry ◽  
Khairunnadim Ahmad Sekak ◽  
Mohd Rozi Ahmad
Keyword(s):  
Molecular Weight ◽  
Polyvinyl Alcohol ◽  
Feed Rate ◽  
Fibre Diameter ◽  
Morphological Structure ◽  
Electrospinning Process ◽  
Molecular Weights ◽  
Microscopy Technique ◽  
Average Fibre Diameter ◽  
Average Fibre

This work focuses on the preparation of electrospun Polyvinyl Alcohol (PVA) nanofibres of three different molecular weights. The electrospinning process parameters were varied in terms of the voltage and feed rate. Scanning Electron Microscopy technique was used to characterize the morphological structure of the electrospun PVA nanofibre. The results show that the average fibre diameter increased as the molecular weight of the polymer increased. The formation of beads occurs from the lowest molecular weight sample of 89K However, long, continuous and beaded-free fibres were obtained from the 125K and 205K polymer weight PVA. The results also suggest that higher spinning voltage and feed rate produce larger fibre diameter, respectively.Keywords : Polyvinyl Alcohol, nanofibres, molecular weight, electrospinningCorresponding Author:Khairunnadim Ahmad Sekak, Faculty of Applied Sciences, Universiti Teknologi MARA (UiTM), Shah Alam, 40450 Selangor Darul Ehsan.Email: [email protected]

Optimization of surface roughness on slitting knives by titanium dioxide nano particles as an additive in grinding lubricant

2018 ◽  
Vol 96 (9-12) ◽  
pp. 4111-4121 ◽  
Author(s):  
Gilberto E. García ◽  
Federico Trigos ◽  
Demófilo Maldonado-Cortés ◽  
Laura Peña-Parás
Keyword(s):  
Surface Roughness ◽  
Titanium Dioxide ◽  
Nano Particles

scholarly journals Cement-Based Materials Containing Graphene Oxide and Polyvinyl Alcohol Fiber: Mechanical Properties, Durability, and Microstructure

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 638 ◽  
Author(s):  
Wenguang Jiang ◽  
Xiangguo Li ◽  
Yang Lv ◽  
Mingkai Zhou ◽  
Zhuolin Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Flexural Strength ◽  
Polyvinyl Alcohol ◽  
Mechanical Strength ◽  
Mechanical Performance ◽  
Control Sample ◽  
Corrosion Condition ◽  
Cement Based Materials ◽  
Strength And Durability ◽  
Pva Fiber

The influence of graphene oxide (GO) and polyvinyl alcohol (PVA) fiber on the mechanical performance, durability, and microstructure of cement-based materials was investigated in this study. The results revealed that compared with a control sample, the mechanical strength and durability of cement-based materials were significantly improved by adding PVA fiber and GO. The compressive and flexural strength at 28 d were increased by 30.2% and 39.3%, respectively. The chloride migration coefficient at 28 d was reduced from 7.3 × 10−12 m2/s to 4.3 × 10−12 m2/s. Under a sulfate corrosion condition for 135 d, the compressive and flexural strength still showed a 13.9% and 12.3% gain, respectively. Furthermore, from the Mercury Intrusion Porosimetry (MIP) test, with the incorporation of GO, the cumulative porosity decreased from more than 0.13 cm3/g to about 0.03 cm3/g, and the proportion of large capillary pores reduced from around 80% to 30% and that of medium capillary pores increased from approximately 20% to 50%. Scanning electron microscope (SEM) images showed a significant amount of hydration products adhering to the surface of PVA fiber in the GO and PVA fiber modified sample. The addition of GO coupling with PVA fiber in cement-based materials could promote hydration of cement, refine the microstructure, and significantly improve mechanical strength and durability.

Electrospun Polyvinyl Alcohol Nanofibers Containing Titanium Dioxide for Gas Sensor Applications

2018 ◽  
Vol 44 (1) ◽  
pp. 251-257 ◽  
Author(s):  
Gomaa F. El Fawal ◽  
H. Shokry Hassan ◽  
Mohamed R. El-Aassar ◽  
Marwa F. Elkady
Keyword(s):  
Titanium Dioxide ◽  
Polyvinyl Alcohol ◽  
Gas Sensor ◽  
Sensor Applications

Insight role of TiO2 to improve the photocatalytic performance of WO3 nanostructures for the efficient degradation of ciprofloxacin

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Muhammad Bilal Tahir ◽  
Sohail Farman ◽  
Adil Rasheed ◽  
Hussein Alrobei ◽  
Khurram Shahzad ◽  
...  
Keyword(s):  
Tungsten Trioxide ◽  
Research Work ◽  
Morphological Structure ◽  
Composite Catalyst ◽  
Excitation Wavelength ◽  
Spherical Structure ◽  
Vis Spectroscopy ◽  
Average Size ◽  
Wo3 Nanostructures

Abstract The current research work is to investigate the photocatalytic efficiency and degradation of ciprofloxacin using WO3/TiO2 nanoparticles under visible light irradiation. The nanoparticles of tungsten trioxide (WO3) and its composite with titanium dioxide (TiO2) i.e. WO3/TiO2 was prepared by hydrothermal method. Four basic characterizations were performed to study the prepared sample materials. To study the morphology of the prepared samples, scanning electron microscopy (SEM) was used. The results of SEM clearly showed that tungsten trioxide (WO3) has Rectangular shaped structure. The average size of the pure Tungsten trioxide nanoparticles was about 40–540 nm. The composite of WO3/TiO2 has spherical structure. The reason behind that was the addition of TiO2 in WO3 changes the morphology of pure WO3, and transformed the rectangular structure to a spherical structure. The presence of TiO2 changes the position and orientation of the nanorods in all possible directions. For the detailed analysis of the functional groups present in these samples, band gap, and optical properties of these samples, Fourier transform infrared spectroscopy (FTIR), ultraviolet visible (UV–VIS) spectroscopy and Photoluminescence (PL) emission spectroscopy was used. UV–Vis spectroscopy results showed that the bandgaps of prepared catalysts vary within the range of 2.76 – 2.5 eV. This decrease in bandgap is directly related with the concentration ratio of TiO2 in WO3. The maximum excitation wavelength observed at 440 nm. The maximum degradation efficiency was at 2% of WO3/TiO2 composite catalyst due to unique morphological structure and increase rate of photo absorption.

Effect of Titanium Dioxide (Tio2) Nano-Fluid on Performance and Emission Features of a Diesel Engine Operated on Aphanizomenon Flos Biodiesel-Diesel Blend

2019 ◽  
Vol 969 ◽  
pp. 421-426
Author(s):  
G. Jayabalaji ◽  
P. Shanmughasundaram
Keyword(s):  
Titanium Dioxide ◽  
Diesel Engine ◽  
Nano Particles ◽  
Nano Particle ◽  
No Emission ◽  
Single Cylinder ◽  
Performance And Emission ◽  
Nano Fluid ◽  
Ci Engine

In this present investigation titanium dioxide (TiO2) nano-fluid was blended with aphanizomenon flos (AF) biodiesel (20%)-diesel (80%) blend. Different percentages of TiO2 such as 5%, 10%, and 15%, was added with AF-D (aphanizomenon flos-diesel) blends. The blends are named as AFD-5TiO2, AFD-10TiO2, and AFD-15TiO2. The performance and emission parameters of a single cylinder CI engine fueled with AFD-TiO2 blends were experimentally investigated. The results reveal that, with the use of TiO2 nano particles, AFD-10TiO2 blend gave optimum results. BSFC decreased by about 5% and BTE increased by about 2% with the addition of TiO2 nano-particle as a catalyst. The tailpipe emissions such as CO, HC, smoke reduced drastically, but the NO emission increased, with the use of TiO2 nano-particles.

scholarly journals Facile fabrication and characterization on alginate microfibres with grooved structure via microfluidic spinning

2019 ◽  
Vol 6 (5) ◽  
pp. 181928 ◽  
Author(s):  
Xiaolin Zhang ◽  
Lin Weng ◽  
Qingsheng Liu ◽  
Dawei Li ◽  
Bingyao Deng
Keyword(s):  
Flow Rate ◽  
Loss Modulus ◽  
Fibre Diameter ◽  
Morphological Structure ◽  
Flow Rates ◽  
Alginate Solution ◽  
The Core ◽  
Facile Fabrication ◽  
Fabrication And Characterization ◽  
Alginate Fibres

Alginate microfibres were fabricated by a simple microfluidic spinning device consisting of a coaxial flow. The inner profile and spinnability of polymer were analysed by rheology study, including the analysis of viscosity, storage modulus and loss modulus. The effect of spinning parameters on the morphological structure of fibres was studied by SEM, while the crystal structure and chemical group were characterized by FTIR and XRD, respectively. Furthermore, the width and depth of grooves on the fibres was investigated by AFM image analysis and the formation mechanism of grooves was finally analysed. It was illustrated that the fibre diameter increased with an increase in the core flow rate, whereas on the contrary of sheath flow rate. Fibre diameter exhibited an increasing tendency as the concentration of alginate solution increased, and the minimum spinning concentration of alginate solution was 1% with the finest diameter being around 25 µm. Importantly, the grooved structure was obtained by adjusting the concentration of solutions and flow rates, the depth of groove increased from 278.37 ± 2.23 µm to 727.52 ± 3.52 µm as the concentration varied from 1 to 2%. Alginate fibres, with topological structure, are candidates for wound dressing or the engineering tissue scaffolds.

Investigation of Micro-Cracks Susceptibility on Machined Pure Titanium Surface in WEDM Process

2016 ◽  
Vol 16 (2) ◽  
pp. 123-139 ◽  
Author(s):  
Anish Kumar ◽  
Vinod Kumar ◽  
Jatinder Kumar
Keyword(s):  
Titanium Dioxide ◽  
Crack Formation ◽  
Research Work ◽  
Pure Titanium ◽  
Machined Surface ◽  
X Ray ◽  
Micro Cracks ◽  
Pulse On Time ◽  
Pulse Off Time ◽  
Wedm Process

AbstractThis research work presents a comprehensive and quantitative analysis of micro-crack formation, in terms of length and number of micro-cracks formed on the machined surface of pure titanium. The effect of processing parameters on micro-crack formation was studied through scanning electron microscope. The results indicate that the micro-crack formation is the best represented in terms of average crack length. Statistical analysis of the results shows that pulse on time, pulse off time and peak current significantly deteriorate the microstructure of machined surfaces which produces the deeper, wider globules of debris and micro cracks. The compounds like titanium dioxide (rutile) (TiO2), (TiO0.325), Ti2O3, Ilmenite (Fe2Ti4O), titanium carbides (TiC) and copper titanium dioxide (Cu3TiO4) were formed due to phase transformations that were analyzed through X-ray diffraction and energy dispersive X-ray method.

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