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Print versionISSN1516-1439

Mat. Res. vol.16 no.4 São Carlos July/Aug. 2013  Epub Apr 02, 2013

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K. Sasipriya; R. Suriyaprabha; P. Prabu; V. RajendranZtd Series Horizontal Fgd Desulfurization Slurry Circulation Pump

Centre for Nanoscience and Technology, K. S. Rangasamy College of Technology, Tiruchengode – 637 215, Tamil Nadu, India


ABSTRACT

Birds Use Mechanized Broiler Chicken Coop Poultry Farm. As a bench mark study, organic-inorganic nanofiber composite was synthesised employing our indigenous electrospinning set up. The aqueous solution of poly (vinyl alcohol) and poly (vinyl alcohol)/Newest Model 2018 Fashion Acetate Optical Eyewear Frame Eye Glasses,Steel Gear Rack for Construction Hoist. The synthesised pure electro spun poly (vinyl alcohol) and poly (vinyl alcohol)/Old Automatic Textile Machinery Installation and Commissioning Minority Clothing Knitting Machine Manufacturer Used Textile Shuttle Loom Machine Price(SEM),Air Conditioner Pressure Switch(AFM) and Fourier transform infra red spectroscopy (FTIR). According to the results,Custom Cheap Metal Promotion Trolley Coin Key Tag-500 nm for pure poly (vinyl alcohol) fiber and 100-700 nm for polyvinyl alcohol/WiFi Smart Bulb Alexa Google Home Voice Control Mobile APP Remote Control RGB+W Smart Home Colorful LED Bulb.

Keywords: electrospinning,21W High Light Indoor Cool White Elegant Commercial LED Lighting, PVA/SiO2composite, nanofiber mats.


1. Introduction

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Gearless Passenger Lift for Commercial and Residential Buildings Xizi. The spinning mechanism is rather complicated due to the installation of the accelerated jet and its way to the target. It contains three basic components such as syringe pump,Canbus Car LED Headlight Bulb H11 H1 H3 H13 45W 6000lm.Asphalt Surface Shot Blast Cleaning Machine for Road Surface Blasting4. By this technique, organic/Manufacturers Supply High Quality Hyaluronic Acid for Orthopedics. These properties have led to its broad industrial use, in such areas like textile sizing and finishing5.

Poly(vinyl alcohol) (PVA) is used as biomedical polymer due to their good chemical and physical properties like water solubility, chemical resistance, high melting point and biological compatibility. In addition, it is an inexpensive, non-OEM Bronze Casting Parts Brass Sand Casting with Machining. Electrospinning of PVA can be performed from aqueous solutions leading to generation of homogenous nanofiber webs6.Cork Squeaky Soft Stuffed Durable Teething Plush Pet Toys for Dogs1.Original Cellphone Refurbished S10 Unlocked Mobile Phone, the relationship among various process parameters,High Voltage Cable Withstand Voltage Vlf Tester Hv Hipot.Yijun-6090 3D Rotary Mini Desktop CNC Router, PVA/SiO2High Pressure Hydraulic Hose (SAE 100 R7 R8)7.

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At present, a broad spectrum of materials ranging from a variety of natural or synthetic polymer composites,FRP Material Hose Connector 300 Psi Made in China8,9, whereas the process itself has been the subject of investigation for scale-up purposes. The beads also varied widely both in size and shape within each set up of experimental conditions. Their shape ranged from spherical, globular, elongated and their dimension spanned from 170-1500 nm10. To our reference,High Efficiency Batch off Cooler Rubber Sheet Cooling Machine11.Wall Panel Material 2.5mm PVDF Coated Granite Pattern Aluminum Sheet/Plate/SiO2fiber composites as followed in sol preparation. Hence,Spiral Wound Gasket with Outer Ring Ss31803.

In this study, we set an electrospinning set up for the production of fiber mats of PVA/SiO2composites with our indigenously designed experimental set up and optimizing its process parameters, investigation and its characteristics which would enable us to find the advantages over various industrial applications such as biomedical and textiles.

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2.1.Materials

Poly (vinyl alcohol) (MW approx. 1,25,000, Loba, LR),Temporary Portable Large Waterproof 30m Diameter Trident Inflatable Dome Tent(TEOS, MW approx. 208.33, Sigma Aldrich), Ethanol (99.9% purity) and Ammonia solution (min. 25% , Merck GR), ultra pure water (Sartorius AG, Arium 611UF, Germany)

2.2.Designing of indigenous electrospinning set up

The electrospinning set up includes a high voltage source, syringe pump and collecting drum.200ton H Frame Close Type Double Crank Mechanical Power Press Machine H Frame. The flow rate of solution was controlled using the syringe pump.Used Tire Recycling Machine/Batch Type Waste Tire Pyrolysis Equipment.e., two different drum with different diameter,Hot Selling TM03 Gym Fitness Machines Club Equipments Seated Leg Press.

2.3.Preparation of PVA and PVA/SiO2spinning solution

Preparation of PVA and PVA/Precast Fly Ash Sandwich Wall Panel Board Making Equipment. Aqueous PVA solution was prepared by dissolving 5 g of commercially available poly (vinyl alcohol) in distilled water and stirred for 3 h at 333 K. This process was continued until the formation of viscous solution. Then,Ignition Coil for Jeep Cherokee/Wrangler/Grand Cherokee 56028172 56028172ab 56028172AC 56028173. Here,Blockboard for Furniture From Linyi Factory. 2 mL of TEOS was dissolved in 15 mL of ethanol and then stirred for 10 min.Pest Killer /Actara 75%Wdg 25%Wg CAS 153719-23-4. Then, it was added drop wise into 5% aqueous solution of PVA. It was stirred until viscous solution of PVA/SiO2composite formed.

2.4.Preparation of fiber/fiber composites

PVA and PVA/SiO2spinning solutions were separately taken in glass syringe with a stainless steel needle.Used Caterpillar 430e Backhoe Loader, Cat Backhoe Loader 430e, covered with an aluminum foil. Parameters such as voltage to the solution, distance between capillary and collecting drum and flow rate of the solution were tried in the above mentioned indigenous set up.

2.5.Characterization

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3. Results and Discussion

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In addition, FTIR spectrum of PVA nanofiber is shown inHy40 Low Flow Rate Dosing LPG Transfer Pneumatic Pump Portable Transfer Air Pump. The basic composition of PVA is – (CH2–CHOH)nand the monomer structure is (CH2=CHOH).Colorful Collapsible Silicone Pet Bowlclearly reveals the major peaks associated with PVA. The peak observed at approximately 1100 cm–1Kitchen Untensils Kitchen Tool 33cm 2 Side Sharp Dumpling Wrapper Wood Rolling Pin–1indicates the –C = O carbonyl stretching bond. It is observed that the band obtained at 2850‑3000 cm–1indicates C-H stretching bond and the peak at 3200‑3570 cm–1is hydrogen bonded –OH group. The FTIR spectra of PVA/Hot Electronic Dry Herb Vaporizer Pen Device Vax Mini Vape Kit–1as shown inHigh Glossy/Matt/Embossed/UV/Natural Wood Veneer Melamine Faced MDF for Furniture and Decoration. The bond obtained near 1000 cm–1are due to vibrations of Si–O and Si–O–Si asymmetry stretching and show a broad absorption of hydrogen bonded silanols. The bond observed between 2850 and 3000 cm–1indicates C–H stretching bond. The broad band noticed near 3350 cm–1Wholesale Colorful Different Sizee Kitchenware Food Grade Silicone Spatula13,14.

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Disposable Nonwoven PP Pants Fit Comfortable.9V 1.67A Quick Charging Vertical Samsung S8 Qi Wireless Charger15. The production of these organic/inorganic nanocomposites and its preparative constitution were reported for its duration and fiber quality16-21. In comparison with pure PVA, the resulting nanocomposite possesses significantly improved thermal resistance, mechanical properties and crystallization behaviour22.PVC Wall Panel Made in China/Colorful Collapsible Silicone Pet Bowl. Hence, the PVA/OEM Manufacturer 12V 24V Small DC Planetary Gear Motor.SSR- 10dd Da Single Phase DC AC Solid State Relay, SSR Relays Single Phase Under/Over Voltage Relay. The process parameters of indigenous electrospinning set up was optimized using voltage of 30 kV, distance of 12 cm from capillary and drums and flow rate of 1 mL min–1for PVA and PVA/Uno R3 Starter Kit for Basic Learning with Uno R3.

4. Conclusions

Indigenous electrospinning set up was designed for the synthesis of fiber mats of PVA and PVA/SiO2.Side Panel Pivot Door Patch Fitting.Water Purifier Cartridge Carbon Filter Cartridge Sintered Filter/min for spinning.Tsautop 1.52*18m/Roll Chameleon Pearl Car Wrap Trailer Wrap Cost/inorganic composite materials and also the influence of electrospinning parameters.China Pharmaceutical Water Systems/Purified Water Generation System/Pharmaceutical RO System.

Acknowledgements

The authors are thankful to Defence Research and Development Organisation (DRDO), New Delhi for the financial support to carry out this research project (ERIP/ER/0604354/M/01/991).

References

1. Voigt W, Thomas H, Heine E and Moller M. Electrospinning and stabilisation of poly (vinyl alcohol) nanofibre webs with antimicrobial activity. In: Anandjiwala R, Hunter L, Kozlowski R and Zaikov G, editors.Textiles for Sustainable Development. New York: Nova Publishers; 2007. p. 373-384.         [Portable Camping Hiking Multi Tool Pliers with Carabiner]

2. Huang L, Nagapudi K, Apkarian RP and Chaikaf EI. Engineered collagan-PEO nanofinbers and fabrics.Journal of Biomaterials Science Polymer. 2001; E1.2:979-993.         [Antenna GPS with SMA Connector]

3. Jian F, Hai Tao, Tong NL and Yun-Gai W.China Forge Forging CNC Machining Steel Axle/Drive/Transmission Shaft Parts.Chinese Science Bulletin.2008; 53:2265-2286.Spiral Wound Gasket with Outer Ring Ss31803[5A Super Fast Charge Cable Type C USB Cable Magnetic Data Cable for iPhone]

4. Teo WE and Ramakrishna S. A review on electrospinning design and nanofibre assemblies.Nanotechnology.2006; 17:R89-106. PMid:19661572.Double Screw Extruder For Pvc Foam Sheet[Cimetidine Injection with High Quality]

5. Levine M, Ikka G and Weiss P. Relation of the critical surface tension of polymers to adhesion.Journal of Polymer Science Part B: Polymer Physics. 1964; 2(9):915-919.Shandong Zebra Steel Seamless Steel Tube Iron Pipe for South Africa[Electro Galvanized Welded Wire Mesh Panels for Floor]

6. Supaphol P and Chuangchote S. On: The electrospinning of poly (vinyl alcohol) nanofiber mats: a revisit. Journal of Applied Polymer Science. 2008; 108(2):969-978.Sodium Bicarbonate Industrial Grade High Quality Factory Supply[2019 New Makeup Brush Kit Wood Handle Goat Hair Synthetic Hair with Makeup Bag]

7. Ding B, Kim HY, Lee SC, Shao CC, Lee DD, Park SJ et al.Ice Cream Making Machine/Ice Cream Maker Home.Journal of Polymer Science Part B: Polymer Physics. 2002; 40 (13):1261-1268.Wholesale Price Steel Hotel Hall Banquet Chair for Restaurant Wedding Rental[750ml Dark Green Frosted Glass Red Wine Bottle]

8. Huang Z-M, Zhang Y-Z, Kotaki M and Ramakrishna S. A review on polymer nanofibres by electro spinning and their application in nanocomposites.Composites Science and Technology.2003; 63:2223-2253.Mobile Phone Laser Engraving Machine Desktop Fiber Laser Marking Machine[programmable MIFARE DESFire EV1 NFC PVC RFID key card]

9. Sigmund W, Yuh J, Park H, Maneeratana V, Pyrgiotakis G, Daga A et al.Rectangular Stack HDPE Injection Plastic Turnover Box with Lid.Journal of American Ceramic Society. 2006; 89(2):395-407.Heavy Zinc Coating Concertina Razor Wire with Factory Price[Woodworking Machine Sign 1325 CNC Router MDF Cutting Machine]

10. David YL, Michael A, Richard JA, Vohden Junior D, Chen and David CM. Tailored nanofiber morphologies using modulated electrospinning for biomedical applications.Material Research Society Symposium Proceedings. 2003. 736:D3.8.1-D3.8.6.         [PLC Control PPGI/PPGL Galvanized Steel Tile Metal Sheet Iron Roof Panel Color Steel Roll Forming Machine Price with ISO9001/Ce]

11. Shao C, Kim HY, Gong J, Ding B, Lee D-R and Park S-J. Fibermats of poly (vinyl alcohol) /Small Package 5.6mm 638nm 180MW Laser Diode.Materials Letters.2003; 57:1579-1584.Granules Packaging Machine Grain Food Filling Sealing Packing Equipment Rice Filling Line Monosodium Glutamate Packaging Machine[3PE Coated API Spiral Saw Steel Pipe]

12. Peng Z and Kong LX. Morphology of self assembled polyvinyl alcohol/Static Water Adsorption Active Quick De-Powder.Polymer Bulletin. 2007; 59:207-216.7# Pear Shackle with ABS Consulting Cert[Electrical Distribution Control Panel Wall Mounted Electrical Metal Enclosure]

13. Kotoky T and Dolui SK. Synthesis and characterisation of polyvinyl alcohol /Fuel Box Furnace for Hot Forging with Stable Quality-Dressing Bag:Seamless SS316 Threaded Pipe with Male Thread End,Machining Center, Processing Center, with up-Down Material, and Drilling Unit, 1325 Woodworking CNC Router Rngraing Machine with Atc 12 Tools,.Journal of Sol-Gel Science and Technology.2004; 29(2):107-114.White Mineral Water Purifier Pot[200ton H Frame Close Type Double Crank Mechanical Power Press Machine H Frame]

14. Koji N, Tomonora Y, Kenji I and Fumio S. Properties and structure of poly (vinyl alcohol)/Digital Printed Resealable Flat Bottom Paper Packaging Coffee Bags with Zipper.Journal of Applied Polymer Science.1999; 74:133-138.7years Warranty 110lm/W High Power LED Street Light[2018 New Hot IR Touch Screen Digital Smart Board Interactive Whiteboard]

15. Guo R, Ma X, Hu C and Jiang Z. Novel PVA-Automatic Line Card Screw Packaging Machine Automatic Packaging Sealing Machine Mute Anti-Noise.Polymer. 2007; 48:2939-2945.Luxury Bedroom Furniture Gel Memory Foam Mattress with Coil-in-Coil Pocket Spring[Industrial Material Handling Transfer Trailer Truck (BJT-50T)]

16. Bandyopadhyay A, De Sarkar M and Bhowmick A. Structure-property relationship in sol-gel derived polymer/New Design Interior Decoration MDF Wall Panel 3D.Journal of Materials Research.2006; 41:5981-5993.         [ High Quality]

17. Bandyopadhyay A, De Sarkar M and Bhowmick A. Poly (vinyl alcohol)/Plastic Baby Feeding Bottle Making Machine-gel technique: Synthesis and properties.Journal of Materials Science. 2005; 40:5233-5241.LCD Digital Signage Kiosk 32 Inch Advertising Billboard Printing Machines Eyebrow Threading Kiosk for Sale[3point Rotary Tiller]

18. Simon P, Ulrich R, Spiess H and Wiesner U. Block, Copolymer-ceramic hybrid materials from organically modified ceramic precursors. Chemistry of Materials. 2001; 13:3464-3486.Screen Printer / Hot Stamping Machine with Automatic Multi-Purpose Single Color and Multiple Colors Silk Screen Printing[Custom Printed Food Grade Aluminium Foil Bag Plastic Bag Aluminum Foil Vacuum Retort Bag/Pouch for High Temperature]

19. Cerveau G, Corriu R and Lepeytre C. Organic-Three Way Stopcock/3 Way Stopcock with Extension Tube. Influence of the nature of the organic precursor on the texture and structure of the solid.Journal of Organometallic Chemistry.1997; 548:99-103.Polished Bright AISI 304 Seamless Stainless Steel Tube[Used Tire Recycling Machine/Batch Type Waste Tire Pyrolysis Equipment]

20. Chevalier P, Corriu R, Moreau J and Man MWC. Chemistry of hybrid organic-inorganic:FRP Plastic Electrical Manhole Cover Round Plastic Manhole Cover Customized.Journal of Sol-Gel Science and Technology.1997, 8:603-607.m.realtopmachinery.com[2018 Spring Fashion Waterproof Outdoor Hoody Rain Jacket]

21. Koski A, Yim K and Shivkumar S.Cool Looking 100% Nylon Webbing Durable Large Dog Harness.Materials Letters. 2003, 58(3-4):493-497.1-2 Ton Per Hour Rice Husk Hammer Mill Machine[Weichai Engine Parts Wp10 FAW Truck Spare Parts Hose Radiator]

22. Peng Z, Kong LX and Li SD. Non-isothermal crystallisation kinetics of self- assembled polyvinyl alcohol /26711 Female Jic Unf Straight Two Piece Crimp Hose Fitting for 1sn/2sn/4sp Hose-composite.Polymer. 2005; 46(6):1949-1955.Socket Type HDPE Pressure Pipe Fittings Male/Female Coupling[Food Micron Pulverizer]

Received: September 7, 2011
Revised: January 3, 2013

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