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 Karakterisasi Mineral Magnetik Sedimen Sungai Citarum Hilir Melalui Analisa Sifat Magnetik, Mineralogi serta Morfologi Magnetik

POSITRON ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 52
Author(s):  
Kartika Hajar Kirana ◽  
Mechdi Ghazali ◽  
Luh Ayu Eka Safitri Septiana ◽  
Dini Fitriani ◽  
Eleonora Agustine ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Total Dissolve Solid ◽  
X Ray ◽  
Scanning Electron

Sungai Citarum merupakan sungai utama yang ada di Provinsi Jawa Barat yang sangat penting bagi kehidupan sosial dan ekonomi. Di bagian hilir, Sungai Citarum ini banyak melewati daerah pemukiman padat penduduk, daerah industri, dan bahkan pesawahan. Oleh karena itu, perlu kajian mengenai kondisi Sungai Citarum salah satunya dengan mengidentifikasi parameter electrical conductivity (EC), total dissolve solid (TDS), pH dan suhu serta karakteristik mineral magnetik pada sedimen melalui analisis sifat magnetik, mineralogi dan morfologi magnetiknya. Pengukuran parameter EC, TDS, pH dan suhu dilakukan secara in situ pada sampel air Sungai Citarum, pengukuran sifat magnetik dilakukan pada sampel sedimen yang telah dipreprasi, sedangkan pengukuran mineralogi dan morfologi dilakukan pada sampel sedimen yang telah diekstraksi. Sifat magnetik sedimen diketahui dari nilai suseptibilitas magnetik dual frekuensi yang diukur menggunakan Bartington Magnetik Susceptibilitymeter, sedangkan mineralogi dan morfologi magnetik diketahui berdasarkan hasil pengukuran scanning electron microscope–energy disperdsive x-ray (SEM-EDS) dan x-ray diffractometer (XRD). Hasil pengukuran secara in situ pada sampel air menunjukkan bahwa rentang nilai EC, TDS, pH dan suhu berturut-turut adalah (200–4120) mS/cm, (100–2060) ppt, 7,34–9,22, dan (26,8–32,6) oC. Sedangkan, hasil pengukuran sifat magnetik menunjukkan bahwa sampel sedimen Sungai Citarum bagian hilir memiliki nilai suseptibilitas magnetik frekuensi rendah (cLF) dengan rentang (65,00–173,80) x 10-8 m3/kg, sedangkan rentang nilai suseptibilitas magnetik frekuensi tinggi (cHF) adalah (64,90–165,70) x 10-8 m3/kg. Dari kedua pengukuran cLF dan cHF diperoleh rentang nilai cFD (%) sebesar 0,15–4,66. Selanjutnya, hasil analisis morfologi dari citra SEM-EDS dan analisis mineralogi berdasarkan pengukuran XRD menunjukkan dominasi jenis mineral magnetik pada sampel sedimen adalah magnetit. Mineral magnetit ini memiliki morfologi berbentuk oktahedral sebagai representasi mineral magnetik alami dan ada pula yang berbentuk spherule sebagai representasi mineral magnetik karena adanya proses oksidasi akibat kehadiran material antropogenik pada sedimen Sungai Citarum bagian hilir.

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.

Attenuation and Absorption of Electromagnetic Waves of Nanocomposites (ZnFe2O3 / Graphene: UPE) by Wave Guide Technical

2021 ◽  
Vol 19 (4) ◽  
pp. 71-76
Author(s):  
M.A. Mohammed ◽  
Fadhil K. Farhan ◽  
I.K. Jassim ◽  
A. Sh. Mahmoud
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Electromagnetic Waves ◽  
Weight Ratio ◽  
Microwave Frequencies ◽  
Nano Powder ◽  
Best Value ◽  
X Band ◽  
Ultrasound Technology ◽  
Scanning Electron

In this article, composites with a polymeric basis were prepared and developed with a ZnFe2O3 material dyed with graphene that has the ability to absorb and attenuate by a weight ratio of (1-4) % of the base. The samples were formed by chemical blending and ultrasound technology to homogenize the mixture. The waveguide technique was used at the microwave frequencies in the range of 8- 12 kHz and within the X-band range - the results showed a significant improvement in the absorbance and attenuation by increasing the percentage of the deformed material compared to the blank material, and the best value was obtained at 3%. The compositional examinations of the Nano powder were performed using a scanning electron microscope technology equipped with an EDX scan.

Preparing and Sphericizing Ultrafine Graphite Particles with Stirred Mill

2014 ◽  
Vol 539 ◽  
pp. 785-789
Author(s):  
Ling Yan Zhang ◽  
Yang Shuai Qiu ◽  
Wei Hong ◽  
Cheng Cai Deng
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Weight Ratio ◽  
Raw Material ◽  
Graphite Particles ◽  
Study Results ◽  
Conditional Tests ◽  
Operation Parameters ◽  
Scanning Electron ◽  
Main Operation

The ultrafine graphite particles was prepared and sphericized by stirred mill. By the conditional tests, the influences of the main operation parameters, such as ball-to-powder weight ratio, grinding concentration, dispersant dosage, agitator speed on grinding efficiencies of stirred mill were studied systematically .The reasons of the influence was analyzed. The study results offered suitable operation parameters for practical production. The scanning electron microscope (SEM) was employed to investigate the structure of the ore sample. The result showed the sphericity of product was improved than the raw material.

Needleless Electrospinning of Silk Fibroin/Gelatin Blend Nanofibres

2015 ◽  
Vol 804 ◽  
pp. 213-216
Author(s):  
Nongnut Sasithorn ◽  
Lenka Martinová
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Silk Fibroin ◽  
Weight Ratio ◽  
Electrospun Fibre ◽  
Composition Ratio ◽  
Needleless Electrospinning ◽  
Electrospinning Method ◽  
Scanning Electron

In this study, nanofibres consisting of silk fibroin (SF) and gelatin (GP) with different composition ratio were fabricated by needleless electrospinning method. The influences of SF/GP blending ratio on the properties of spinning solution and the morphology of electrospun fibres were investigated. A variety of compositions of the silk fibroin/gelatin blend solutions were successfully electrospun into nanofibres sheet. The morphology of electrospun fibre was characterized by a scanning electron microscope (SEM) which indicates that the morphology of obtained fibres was influenced by the weight ratio of gelatin to silk fibroin in the spinning solution. It was observed that the blending ratio of gelatin to silk fibroin in spinning solution played an important role in spinning performance of the process and the diameter of obtained fibres. An increasing in gelatin content in blended solution resulted in bigger diameter of the obtained electrospun fibres. The silk fibroin/gelatin electrospun fibres had diameters ranging from 200 to 660 nm.

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