پديد آورنده :
عابديني، ابراهيم
عنوان :
طراحي و ساخت شتاب دهنده ميكرو و نانو ذرات در فشار جو و تعيين توزيع اندازه ذرات
گرايش تحصيلي :
شيمي فيزيك
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي
صفحه شمار :
يازده، 199 ص.: مصور، جدول، نمودار.
يادداشت :
ص. ع. به فارسي و انگليسي
استاد راهنما :
محمود تبريزچي
استاد مشاور :
حسين فرخ پور
توصيفگر ها :
باردار كردن ذرات , بارداري تماسي , آناليز و اندازه ذرات , شتاب دهي ذرات , پخش كننده ذرات
تاريخ نمايه سازي :
15/2/1389
استاد داور :
اميرسيد حسن روضاتيان، حسن سبزيان، تقي خياميان، عزت كشاورزي
كد ايرانداك :
ID296 دكتري
چكيده فارسي :
به فارسي و انگليسي: قابل رؤيت در نسخه ديجيتال.
چكيده انگليسي :
Design and Construction of Nano and Microparticle Accelerator at Atmospheric Pressure and Determination of Particle Size Distribution Ebrahim Abedini E mail ebi abed@yahoo com November 17 2009 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 Iran Supervisor Prof Mahmoud Tabrizchi E mail m tabriz@cc iut ac ir Advisor Dr Hossein Farrokhpour E mail h farrokh@cc iut ac ir Department Graduate Coordinator Prof Bijan Najafi Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 Iran Abstract In this work a simple and inexpensive design is proposed for generating a highly charged particle beam at atmospheric pressure The design consists of two parallel plates followed by vertically mounted drift rings both of which are connected to a high voltage source to create a high electric field between the two plates as well as between the drift rings Powder is loaded on the lower plate where the particles are charged due to the high voltage contact and escape from an aperture on the upper plate The device is capable of producing micro or nanoparticle charged beams for both the insulating and conducting materials The charge of the particles is in the order of 106 e for a 100 m particle The charge distribution of particles was found to be a function of their size and the applied electric field between the two plates Using the charged particle source a new particle sizer which integrates the dispersion and detection parts is presented Particles are dispersed based on bouncing between the two plates and escape into the measuring area where the size is determined by light scattering The instrument is calibrated using standard powders The data obtained from the new instrument are in good agreement with those obtained from a commercial particle size analyzer The sizer works both for insulator and conductive powders In addition a macro ion mobility spectrometer was constructed In this design the charged particle source was coupled to a drift tube A PMT and two laser beams were used to measure the velocity of the particle Having the electrical mobility and the charge of the particle its size is determined using Stockes Einestain Equation Key words particle size analyzer particle dispenser contact charging particle charging 1 Introduction Particle size analyzers have been widely used in industry as important tools for the characterization of a large number of industrial processes such as ink toners ceramic powders inorganic pigments fillers for paint and rubber pharmaceutical and food products etc A comprehensive range of particle size analyzers for many different sample types and applications has been offered including differential mobility analyzer DMA scanning mobility particle sizer electrical aerosol analyzer detector and analyzers based on optical techniques Dynamic light scattering static light scattering and laser diffraction are used for analyzing particles dispersed in liquid or gas Time of flight aerodynamic particle size analyzer is used in gas phase The necessary step in all these techniques involves dispersing the particles into a gas stream The dispersed particles then need to be carried into a measuring cell where the laser light interacts with the particles Dry powders that are free flowing are easily dispersed for example in a free fall by gravity However for other dry powders dispersing agglomerates into individual particles is a challenge
استاد راهنما :
محمود تبريزچي
استاد مشاور :
حسين فرخ پور
استاد داور :
اميرسيد حسن روضاتيان، حسن سبزيان، تقي خياميان، عزت كشاورزي
