Polen Tespiti için Sıvı Kristal Esaslı Yenilikçi Sensör Geliştirilmesi

Öz

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.

Anahtar Kelimeler

• Alerji,Kiral Madde,polen,Kolesterik Sıvı Kristal,Dalga boyu

Development of a Novel Liquid Crystal Sensor for Pollen Detection

Öz

In this study, we have reported liquid crystal based-sensor for the detection of pollen concentration which triggers an allergy. Cholesteric liquid crystal which is mesophase of thermotropic liquid crystals was used a sensing element in the pollen sensor. The cholesteric liquid crystal samples operating at room temperature were formulated using nematic liquid crystal and chiral dopants in different compositions. The pollen concentration which is embedded in the cholesteric liquid crystal was determined as a function of change in color of cholesteric liquid crystal in the prototype. We demonstrated that the variation of color from green to blue with the increasing pollen concentration using Ocean Optics spectrophotometer. Therefore, the rapid and easy determination of pollen concentration have been became possible by using this prototype.  Our sensor will provide simplicity and self-test as a screen of pollen concentration by using the optical advantage of cholesteric liquid crystal as a sensing element. 

Anahtar Kelimeler

• Allergy,Chiral dopant,Cholesteric liquid crystal,Pollen,Wavelength

Kaynakça

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