Akademik Veri Yönetim Sistemi
Kandemır A. Ç. (Yürütücü)
Yükseköğretim Kurumları Destekli Proje, 2020 - 2022
"The most important requirements of contemporary engineering materials are biocompatibility, light weight and mechanical superiority. Biocompatibility and light weight are not only important for medical applications such as prosthetic/ dental usage but also are very relevant for MEMS (Micro electro-mechanical systems) systems especially for bio-sensor, bio-actuator and flexible electronic applications. However, the biocompatible material should also have superior mechanical properties in order to be utilized as an engineering product. In this study, it is aimed to produce a biocompatible and mechanically strong film which could be beneficial for applications like flexible electronics and bio-sensors. Actually, biological materials have very impressive mechanical properties such that brick and mortar structure of nacre of the mollusk shell is perfect example for tough/strong material [1]–[12]. In this study, it is aimed to imitate micro-structure of nacre in order to combine biocompatibility and superior mechanical properties. It is planned to produce a composite film structure constituents of which are biocompatible polymer and reinforcements. The mechanical characterization is thought to be conducted by colloidal probe microscopy and Nano indentation. Nacre is a composite material, matrix and primary reinforcement of which are biopolymer (proteins, chitin) and aragonite (a form of calcium carbonite). It is made of the aragonite platelets in stacking fashion so that 95 volume% of the composite consists of the reinforcements which serve as the brick for 5 vol% polymer matrix (mortar). It should be noted that this far higher packing of the reinforcements could not be achieved by 1-D arrangement of fibers for commercial composites which leads effective strengthening and stiffening of matrix [2], [5]. More importantly, intriguing aspect of this arrangement is that despite the brittle constituents of which, surprisingly nacre has very high toughness[3], [10], [12]. However, fracture toughness of the commercial composites are reduced through strengthening by the reinforcements. There are few studies regarding nacre mimetic polymer composite film production [4], [13]–[21] and even fewer studies by nano-scale reinforcements [4], [16], [21], [22]. In this study, it is aimed to produce nacre-mimetic composite film structure matrix and reinforcement of which are, Poly vinylpyrrolidone (PvP) and Nanoclay (Montmorrilonite). The production is going to be accomplished by spin coating. PvP is a water soluble, nontoxic and biocompatible polymer. Because of these properties, it is widely utilized in biomedical field as drug delivery agent and drug carrier and is a perfect candidate to be a biofilm material. However, its mechanical properties are inferior. In this study, in order to benefit from its biocompatibility, mechanical properties of PvP is going to be improved by nanoclay reinforcements. This is going to be first study regarding composite biofilm production with PvP and nanoclay."