Polen Tespiti için Sıvı Kristal Esaslı Yenilikçi Sensör Geliştirilmesi

Yıl 2020, Cilt: 22 Sayı: 64, 309 - 313, 24.01.2020

Emine Kemiklioğlu , Tugce Ülker

https://doi.org/10.21205/deufmd.2020226430

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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