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Register a new userA study of possibility of manufacturing Nano webs of mixtures of poly vinyl alcohol with silver nitrate by electro spinning process
دراسة إمكانية تصنيع شبكات نانوية من مزائج بولي فينيل الكحول مع نترات الفضة بطريقة الغزل الكهربائي
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ضفاف عثمان( باحث )
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لقد استخدمنا في هذا البحث تقنية الغزل الكهربائي للحصول على شبكات لا منسوجة من الألياف النانوية من بولي فينيل الكحول و جزيئات الفضة النانوية حيث قمنا بإذابة بوليمير بولي فينيل الكحول في مذيبه الماء لتشكيل محلول بوليميري يتم شحنه بشحنة كهربائية موجبة و بثقه ليترك على مجمع للألياف مشحون بشحنة سالبة و طبقنا حقل كهربائياً ذو جهد عالي . كما وقمنا في هذا البحث بمزج محلول بولي فينيل الكحول مع نترات الفضة بتراكيز مختلفة و غزلها كهربائياً للحصول على شبكات من ألياف نانوية و جزيئات نانوية من الفضة و من ثم قمنا بتطبيق عملية معالجة حرارية لجميع العينات على درجة حرارة 150 درجة مئوية لهدفين أولهما إجراء عملية التشابك العرضي بين سلاسل ال PVA و بالتالي تصبح غير ذوابة في الماء و الهدف الثاني هو استقرار جزيئات الفضة النانوية . و أخيرًا قمنا بتحليل العينات على المجهر الالكتروني الماسح.
In this study we used electro spinning technology to obtain nonwoven webs of Nano fibers of poly vinyl alcohol and Nano particles of silver . we dissolve the polymer poly vinyl alcohol in it's solvent (water) to form a polymeric solution that we charged it by positive charge and ejected it to leaving it on a collector that we charged it by negative charge and used a high voltage. and we mixed the polymer poly vinyl alcohol with silver nitrate with different concentrations and electro spinning the mixture to obtain Nano fibers and Nano particles of silver then we applied heat treatment for the whole samples at 155°c for 5 minutes for tow aims the first one is to make crosslinking between series of PVA and the second is for the stability of silver nanoparticles , finally we analyze samples on Scanning Electron Microscopy SEM .
References used
CIRSTEA,M,N - DINU,A-McCORMICK,M, 2002 –Neural and Fuzzy Logic Control of drives and power systems. Newnes, 396p
TIMOTHY J.R, 2010 – Fuzzy Logic with engineering application. Wiley,3rdEdition,New Mexico, 585p
ZIDANI,F.BENAICHA,S .NAITSAID,R 2005 Improve DTC of induction motor with fuzzy resistance estimator ,Eusflat – LFA2005. 222-226
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In this paper, we have used electrospinning technique to obtain nonwoven networks of nanofibers from polyacrylic nitrile, where we dissolved polyacryl nitrile in its dimethylformamide solvent to form the polymeric solution.
Nylon-6/6 continuous Polymer nanofibers (NF) were produced by using conventional single needle
electrosprinng (ES) technique. In this paper several parameters, such as applied voltage and needle
diameter were investigated to optimize fiber morpholo
gy. The morphological and structure properties of
the fiber (average diameter, height, length, surface roughness and fiber shape) are visualized by Atomic
Force Microscopy (AFM). Good alignment of polymer nanofibres was confirmed by AFM and optical
microscopy observations. We concluded that fiber diameter increases with decreasing applied voltage
intensity and increasing the distance between the electrodes.
Porous glasses were produced using sheet glass cullet with added
magnesium carbonate MgCO3 as foams agents .The structure of glasses
tinged with silver bromide by porous glasses, was studied by UV–VIS
spectroscopy,transmission of light and X-ray diffraction XRD
techniques. glasses plates were obtained by impregnation of porous
glasses at first with AgNO3 aqueous solution , next in the KBr aqueous
solution. Then the samples was sintered at temperatures 950°C up to
closing of the pores. The results of spectroscopy study have shown that
the glasses tinged plates, according to XRD data, the glasses tinged
contain the AgBr phase.
In this research we have prepared thin films from poly vinyl chloride (PVC) by spin
coating technique in three velocities (1000,2000,3000)RPM on glass substrate (Micro
scope cover glass), at room temperature. The absorbance A, and transmittance T f
or the
films were studied in the visible and ultra-violet region (UV-VIS). In addition,we have
calculated the absorbance coefficient α, skin depth δ, refractive index no, dielectric
constant ε (the real part and the imaginary part), also we have calculated the energy band
gap of allowed and forbidden direct transitions.
The films showed high transmittance (80-90)%, in the infrared region as a function
of the spinning velocity and took the maximum value 80% for the velocity 1000RPM, and
90% for the velocity 3000RPM, and the refractive index was decreased with the velocity
increase, we found it between3.67 and 4.56 for the velocities 3000RPM and 1000RPM
respectively. Whereas the skin depth δ decreased with the increasing of velocity, the
minimum value was 0.0000531cm for the velocity 3000RPM and the maximum value was
almost 0.00023cm for the velocity 1000RPM.
Silver nano- particles (NPs) are used in many fields because of
their unique electrical, optical, chemical and biological (antibacterial)
properties. Recently, inkjet technology has been used
to produce flexible electronic circuit at low cost.
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