Chemical Engineering / Kimya Mühendisliği
Permanent URI for this collectionhttps://hdl.handle.net/11147/14
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Book Part Citation - WoS: 28Citation - Scopus: 26Laos (large Amplitude Oscillatory Shear) Applications for Semisolid Foods(Springer, 2019) Yazar, Gamze; Çağlar Duvarcı, Özlem; Yıldırım Ertürk, Merve; Kokini, Josef L.The rheological behavior of semisolid foods under large amplitude oscillatory shear (LAOS) can offer more detailed understanding of structural changes occurring during processing and consumption compared to traditional rheometry. This chapter focuses on a detailed description of LAOS measurements, including theory, testing method, data interpretation, and corrections. It also discusses LAOS application to food systems with different core structures ranging from dilute dispersions to gels, foams, emulsions, and soft elastic networks, along with a special emphasis on yogurt. Type of stress responses for different rheological behavior, Lissajous-Bowditch curves, and the resulting LAOS parameters e3/e1, ?3/?1, S, and T) are used to understand the structural changes in all of these foods with special emphasis on high-fat, low-fat, and non-fat yogurt. © 2019, Springer Nature Switzerland AG.Conference Object Citation - WoS: 5Citation - Scopus: 5Preparation and Microstuructural Development of Nanocrystalline Titania and Alumina(Trans Tech Publications, 2004) Çağlar Duvarcı, Özlem; Çiftçioğlu, Muhsin; Güden, Mustafa; Arıkut, G.The preparation of nanocrystalline titania and alumina was investigated by sol-gel methods using titanium isopropoxide, boehmite and aluminum isopropoxide. Various drying control chemical additives like oxalic acid, acetic acid and polyacrylic acid were used for modifying the drying behaviour and shrinkage of the gels. The sintered densities of the ceramics prepared by sol-gel processing and the dried gels were in the 79-99% of theoretical density for rutile. The green and sintered densities of the pellets prepared by uniaxial pressing of powders derived from sols, gels and precipitation techniques for titania were in the 40-52% and 55-83% respectively. The titania ceramics were observed to experience anatase-rutile phase transformation upon heat treatment at 650oC. The grain size of the sintered ceramics at 650oC was determined to be about 26 nm. Grain size of titania increased to 213 nm. at 850oC. The mechanical properties of these nanocrystalline ceramics were investigated by using microhardness testing.