Chemical Engineering / Kimya Mühendisliği
Permanent URI for this collectionhttps://hdl.handle.net/11147/14
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Research Project Ultrason kontrast ajanlarının geliştirilmesi ve karakterizasyonu(2012) Özdemir, Sevgi Kılıç; Özdemir, Ekrem; Okur, SalihUltrasonografi, bata koroner kalp damar hastalklar (ekokardiografi) olmak üzere, çeitli hastalklarn tehisinde kullanlan ve maliyet etkinli i olan bir diagnostik görüntüleme yöntemidir. Ultrasonda görüntü, transdüserden gönderilen ses dalgalarnn geriye yansmas sonucu olumaktadr. Ancak, baz durumlarda çevreleyen dokulardan gelen arka plan sinyaller yöntemin hassasiyetini azaltmakta, do ru tehis için yeterince net bir görüntü elde edilememektedir. Görüntü kalitesinin artrlmas için kontrast ajan olarak adlandrlan mikroköpükçükler kullanlmaktadr. Ayrca, mikroköpükçükler ilaç, gen, ve DNA tamakta ve kontrollü salmlarda da kullanlmaktadr. Mikroköpükçüklerin bu ve daha nitelikli alanlarda kullanlabilmeleri için, yaplarnn güçlendirilmesi ve stabilitelerinin artrlmalar gerekmektedir.Article Citation - WoS: 20Citation - Scopus: 23Effect of Humidity on Electrical Conductivity of Zinc Stearate Nanofilms(Elsevier Ltd., 2007) Öztürk, Serdar; Balköse, Devrim; Okur, Salih; Umemura, JunzoIn this work, stearic acid (StAc) and zinc stearate (ZnSt2) nanofilms were deposited on glass and silver substrates using Langmuir-Blodgett (LB) film technique and their structural and electrical properties were investigated. X-ray diffraction and IR techniques revealed that more crystalline and better films were obtained from ZnSt2 compare to StAc. Electrical conductivity of ZnSt2 LB films with 13 layers having 28 nm thickness were measured in the range of humidity of 20-60% and it is seen that the conductivity was very sensitive to relative humidity (RH) above 40% at 25 °C and showed no hysteresis during adsorption and desorption of water vapor. Water vapor adsorption isotherm of ZnSt2 powders was determined and conductivity increase with humidity was attributed to water vapor adsorption. Constant electrical conductivity of the ZnSt2 films at low relative humidities and at low voltage values is an advantageous property which allows using them as organic nanofilms with insulating properties.