TY - JOUR T1 - Development of a Novel Liquid Crystal Sensor for Pollen Detection TT - Polen Tespiti için Sıvı Kristal Esaslı Yenilikçi Sensör Geliştirilmesi AU - Kemiklioğlu, Emine AU - Ülker, Tugce PY - 2020 DA - January DO - 10.21205/deufmd.2020226430 JF - Dokuz Eylül Üniversitesi Mühendislik Fakültesi Fen ve Mühendislik Dergisi JO - DEUFMD PB - Dokuz Eylul University WT - DergiPark SN - 1302-9304 SP - 309 EP - 313 VL - 22 IS - 64 LA - en AB - In this study, we have reportedliquid crystal based-sensor for the detection of pollen concentration whichtriggers an allergy. Cholesteric liquid crystal which is mesophase ofthermotropic liquid crystals was used a sensing element in the pollen sensor. Thecholesteric liquid crystal samples operating at room temperature wereformulated using nematic liquid crystal and chiral dopants in differentcompositions. The pollen concentration which is embedded in the cholestericliquid crystal was determined as a function of change in color of cholestericliquid crystal in the prototype. We demonstrated that the variation of colorfrom green to blue with the increasing pollen concentration using Ocean Opticsspectrophotometer. Therefore, the rapid and easy determination of pollenconcentration have been became possible by using this prototype. Our sensor will provide simplicity andself-test as a screen of pollen concentration by using the optical advantage ofcholesteric liquid crystal as a sensing element. KW - Allergy KW - Chiral dopant KW - Cholesteric liquid crystal KW - Pollen KW - Wavelength N2 - Bu çalışmada, alerjiye neden olan polen konsantrasyonunun tespitine yönelik sıvı kristal esaslı bir polen sensörü geliştirilmiştir. Geliştirilen sensörde, algılayıcı madde olarak kolesterik sıvı kristal kullanılmıştır. Kolesterik sıvı kristal örnekleri; nematik sıvı kristal ve kiral maddelerin farklı bileşimleri kullanılarak hazırlanmıştır. Hazırlanan kolesterik sıvı kristal numunelerinin oda sıcaklığında da sıvı kristalin bir alt fazı olarak gözlemlenebilmesi istendiği için çeşitli kiral maddeler kullanılarak farklı numuneler formüle edilmiştir. Hazırlanan numunelere ağırlıkça farklı oranlarda polen eklenmiş ve renklerinde meydana gelen değişiklikler spektrofotometre yardımıyla saptanmıştır. Kolesterik sıvı kristalin optik özelliklerinin sağladığı renk değiştirme özelliğinden yararlanılarak, artan polen konsantrasyonuyla yeşilden maviye bir renk değişimi elde edilmiş, böylelikle değişen polen konsantrasyonunu renk değişiminin bir fonksiyonu olarak saptayan bir prototip geliştirilmiştir. Geliştirilen bu prototip kolay ve bireysel kullanım sağlaması bakımından yenilikçi bir ürün özelliği taşımaktadır. CR - [1] Eder, W., Ege, M.J., von Mutius, E. 2006. 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