Effect of PEO on the Hydrophilicity of PLLA Ultrafine Fibers

2012 ◽  
Vol 535-537 ◽  
pp. 2390-2393
Author(s):  
Jia Xu ◽  
Jin Xian Wang ◽  
Xiang Ting Dong ◽  
Gui Xia Liu ◽  
Wen Sheng Yu
Keyword(s):  
Tissue Engineering ◽  
Extracellular Matrix ◽  
Contact Angle ◽  
Lactic Acid ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Polyethylene Oxide ◽  
Water Contact ◽  
Ultrafine Fibers ◽  
Scanning Electron

The Polyethylene oxide (PEO) / Poly (L-lactic acid) (PLLA) ultrafine blend fibers have been prepared by electrospinning. The hybrid solvent of trichloromethane and ethanol was found to be the co-solvent for electrospinning. The PEO/PLLA blend solutions in various ratios were studied for electrospinning into ultrafine fibers. The morphology of the fibers was shown by scanning electron microscope (SEM). The hydrophilicity of fiber samples was characterized by determining their water contact angle. The spun ultrafine fibers are expected to be used in the native extracellular matrix for tissue engineering.

scholarly journals Blended PVA/PVP Electro spun nanofibers for Coating Application

2021 ◽  
Vol 2114 (1) ◽  
pp. 012031
Author(s):  
R Mohammed ◽  
H Jawad ◽  
A. Al-Zubiedy
Keyword(s):  
Electrical Conductivity ◽  
Contact Angle ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Weight Ratio ◽  
Polymeric Materials ◽  
Vinyl Pyrrolidone ◽  
Pumping Rate ◽  
Coating Application ◽  
Scanning Electron

Abstract The use of polymeric blended nanofibres is one of the recent applications in the food and liquid packaging. The current research aims to prepare the nanofibers coatings from the blend of polymeric materials via the electro spinning technique 0.08 weight ratio concentration of polyvinyl alcohol (PVA) dissolved in water, as well as, (0.2 weight ratio concentration ) of poly vinyl pyrrolidone (PVP) were used to obtain different volume proportions of (PVA:PVP) solutions include (100:0, 80:20,70:30, 50:50, 20:80, and 0:100). The electro spinning system was organized with pumping conditions (20 kV for the applied voltage, 20 cm pumping distance, 1ml/hr pumping rate) and a needle diameter with 0.4mm diameter. The properties of the polymeric solutions involve (viscosity, surface tension, and electrical conductivity of the liquid) were examined. A scanning electron microscope technique was used to study the surface properties of the prepared films, and the contact angle via the contact angle analyzer was examined. The results of a scanning electron microscope proved that the diameter of the nano fibers increases with increasing the concentration and viscosity of solutions and decreasing its electrical conductivity. Also, the results of the contact angle analyzer showed an increase the hydrophilic property via increasing percentage of polyvinylpyrrolidone.

scholarly journals Imaging of native early embryogenic tissue of Scots pine (Pinus sylvestris L.) by ESEM

2015 ◽  
Vol 10 (1) ◽  
Author(s):  
Jiří Hřib ◽  
Božena Vooková ◽  
Vilém Neděla
Keyword(s):  
Extracellular Matrix ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Structural Integrity ◽  
Dark Field ◽  
Environmental Scanning Electron Microscope ◽  
Embryogenic Tissue ◽  
Environmental Scanning ◽  
Field Mode ◽  
Scanning Electron

AbstractEnvironmental scanning electron microscopy enables the investigation of uncoated pine early embryogenic tissue samples in situ. The samples were examined under low vacuum conditions (air pressure 550 Pa) at a temperature of around -18°C by the AQUASEM II noncommercial environmental scanning electron microscope. The native extracellular matrix surface network was imaged by the environmental scanning electron microscope and in dark field mode of the optical microscope too. The backscattered electron detector disclosed brightness loci in the cells of early embryogenic culture. This work shows images of native pine embryogenic tissues. The continuity of extracellular matrix with structural integrity of plant organism is discussed.

scholarly journals INFLUENCE OF POLYETHYLENE OXIDE CONTENT ON SOME CHARACTERISTICS OF PLA/CS FILMS LOADING NIFEDIPINE

2017 ◽  
Vol 55 (6) ◽  
pp. 716 ◽  
Author(s):  
Nguyen Thuy Chinh ◽  
Trang Thi Thu Nguyen ◽  
Mai Thi Tran ◽  
Cong Van Do ◽  
Huynh Duc Mai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Polylactic Acid ◽  
Field Emission ◽  
Polyethylene Oxide ◽  
Oxide Content ◽  
Hydrophobic Property ◽  
Water Contact ◽  
Scanning Electron

This work mentions the effect of polyethylene oxide (PEO) content on some characteristics and properties of polylactic acid (PLA)/chitosan (CS) films loading nifedipine (NIF). The water contact angle, droplet size values and Field Emission Scanning Electron Microscopy (FESEM) images  of the films are used to investigate their morphology and hydrophobicity. The obtained results show that the hydrophobic property of the PLA/CS/NIF films is improved by the presence of PEO. Besides, the PLA/CS/NIF films containing PEO have tighter structure and water absorbed ability less than those of the PLA/CS/NIF films

Novel Antibacterial Nanofibers of Chitosan and Polyurethane Prepared by Electrospinning

2010 ◽  
Vol 150-151 ◽  
pp. 1452-1456 ◽  
Author(s):  
Wei Min Kang ◽  
Bo Wen Cheng ◽  
Quan Xiang Li ◽  
Fang Fang Zuo
Keyword(s):  
Tissue Engineering ◽  
Extracellular Matrix ◽  
Antibacterial Activity ◽  
Fourier Transform ◽  
Electron Microscope ◽  
Average Diameter ◽  
Chitosan Concentration ◽  
Ft Ir ◽  
First Time ◽  
Scanning Electron

The chitosan(CS)/polyurethane(PU) blend nanofibers have been prepared for the first time by electrospinning. Formic acid (FA) and Hexafluoroisopropanol (HFIP) were found to be the co-solvent for electrospinning. The CS/PU blend solutions in various ratios were studied for electrospinning into nanofibers. The diameter and morphology of the fibers were shown by scanning electron microscope (SEM). It was found that the average diameter of the chitosan/PU blend fibers became larger, and the morphology of the fibers became finer with the content of PU increasing. To show the molecular interactions, CS/PU fibers were characterized by Fourier transform infrared spectroscopy (FT-IR). Moreover, the antibaterial activity of blend nanofibers against Escherichia coil (E.coil) was measured via optical density method. The blend nanofibers exhibited satisfying antibacterial activity against E.coil, even the chitosan concentration was only 5wt%. Therefore, the spun nanofibers are expected to be used in the native extracellular matrix for tissue engineering.

Polyethylene Oxide Nanofibers as Ultraviolet Sensors

2006 ◽  
Vol 948 ◽  
Author(s):  
Saima Naz Khan ◽  
Jeffrey J. Rack ◽  
Aaron R. Rachford ◽  
Martin E. Kordesch
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Ultraviolet Light ◽  
Polyethylene Oxide ◽  
Light Wavelength ◽  
Electrospinning Technique ◽  
Pale Yellow ◽  
Cast Films ◽  
Scanning Electron ◽  
Sem Studies

ABSTRACTUsing the electrospinning technique, we have prepared [Ru (pic) 2 (dmso) 2] doped-polyethylene oxide nanofibers for ultraviolet sensing. The diameter of the as-prepared fibers is in the range of 1μm-100nm. These fibers change color from pale yellow to orange when exposed to ultraviolet light (wavelength∼350nm) and return to their original color after approximately 2-3 days. The intensity of the color increases with an increased time of exposure to UV. The color changing behavior in the nanofibrous mat is almost the same as that in cast films prepared from the same solutions. The scanning electron microscope (SEM) studies of the fibers show that the morphology of the fibers remains unchanged after exposure to UV.

Facile Preparation of the Superhydrophobic Surface on Aluminum Alloy by PP-Coating

2012 ◽  
Vol 583 ◽  
pp. 342-345 ◽  
Author(s):  
Wen Yong Liu ◽  
Lin Yu Sun ◽  
Yu Ting Luo ◽  
Ruo Mei Wu ◽  
Hai Yun Jiang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Aluminum Alloy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Superhydrophobic Surface ◽  
Suitable Method ◽  
Optical Contact ◽  
Nano Structure ◽  
Facile Preparation ◽  
Scanning Electron

We investigated the preparation of the superhydrophobic surface on aluminum alloy by PP coating. The effects of PP concentration and duration on the surface were discussed. The contact angle (CA) was measured by an optical contact angle meter and the morphology of the surface was observed by a scanning electron microscope. The result showed that the superhydrophobic surface on aluminum alloy could be facilely fabricated by direct PP coating with a suitable concentration. It was confirmed by SEM that the superhydrophobic surface was resulted from the micro/nano-structure of PP. However, the CA became much lower as time went on. It was indicated that the duration of the superhydrophobic surface on aluminum alloy by direct PP coating was poor and a suitable method for improving the duration should be adopted.

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