Elastin Çözeltilerinin Viskoelastik Karakterizasyonları

Yıl 2021, , 922 - 926, 31.08.2021

Guler Bengusu Tezel

https://doi.org/10.35414/akufemubid.862875

Öz

Bu çalışmada, izole ağırlıkça %0,1-%3 (w/w) elastin sulu çözeltilerinin viskoelastik karakterizasyonları incelenmiştir. Doğrusal ve doğrusal olmayan viskoelastik testleri reometre kullanılarak gerçekleştirilmiştir. Düşük derişimlerde, Newtonumsu akış özellik gösterirken, özellikle %2, %2,5 ve de %3’ de artan elastik davranışları ile Newtonumsu olmayan viskoleastik akış özellikleri hakim olmaktadır. Bu kapsamda, eşik akış streslerine de yüksek derişimlerde rastlanmaktadır. Frekans aralığı 0.1-10 s-1 de tutulan, elastik modül (G’) ve viskoz modül (G’’) değişimlerinin frekans değişimi ile doğrusal davrandığı gözlenmiştir. Artan derişimlerle, G’ modülün G’’ modülüne göre daha yüksek olduğu tespit edilmiştir. Ayrıca, %3’ lük elastin çözeltisinin dondururak kurutma yöntemi kullanılarak taramalı elektron mikroskopuyla, hidrojel yapılarının oluşumu gözlenmiştir.

Anahtar Kelimeler

Elastin, Reoloji, Doğrusal viskoelastiklik, Doğrusal olmayan viskolelastiklik

Destekleyen Kurum

BAİBÜ

Proje Numarası

2018.09.09.1316

Viscoelastic Characterizations of Elastin Solutions

Öz

In this study, viscoelastic characterizations of isolated 0.1%-3% (w/w) elastin solutions were investigated. Linear and non-linear viscoelastic test were performed by using rheometer. At low concentrations, solutions behaves Newtonian flow, especially for 2%, 2.5%, 3% of elastin solutions have non-Newtonian viscoelastic flow properties. In this context, yield stress are also observed at high concentration values. It is indicated that elastic modulus (G’) and viscous modulus (G’’) change linearly within the frequency range of 0.1- 10 s-1. G’ and G’’ are found to be increased with increased concentration of elastin. In addition, 3% of elastin solutions using freeze dried method were analyzed with scanning electron microscopy, and hydrogelling formations are observed.

Anahtar Kelimeler

Elastin, Rheology, Linear viscoelasticity, Non-linear viscoelasticity

Proje Numarası

2018.09.09.1316

Kaynakça

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