Preparation and characterization of antibacterial Senegalia (Acacia) senegal/iron–silica bio-nanocomposites
| Autor: | Gizem Akdut, Ayben Kilislioglu, Öykü Ürk, Selcan Karakuş, Gulin Selda Pozan Soylu, Özgür Birer, Ayşen Kolan, Ezgi Tan, Tuba Şişmanoğlu |
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| Rok vydání: | 2015 |
| Předmět: |
Zerovalent iron
Thermogravimetric analysis Nanocomposite Materials science food.ingredient General Physics and Astronomy Nanoparticle Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films food Chemical engineering Organic chemistry Gum arabic Thermal stability Particle size Dispersion (chemistry) |
| Zdroj: | Applied Surface Science. 354:250-255 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2015.07.206 |
| Popis: | Many studies that research bio-nanocomposites utilize techniques that involve the dispersion of strengthening components like silica, metal and metal oxides through a host biopolymer matrix. The biggest success factor for the bio-nanocomposite is having a smooth integration of organic and inorganic phases. This interattraction between the surfaces of inorganic particles and organic molecules are vital for good dispersion. In this study, a novel biodegradable antibacterial material was developed using gum arabic from Senegalia senegal (stabilizer), silica (structure reinforcer) and zero valent iron particles. Silica particles work to not only strengthen the mechanical properties of the Senegalia senegal but also prevent the accumulation of ZVI nanoparticles due to attraction between hydroxyl groups and FeO. The gum arabic/Fe–SiO 2 bio-nanocomposite showed effective antibacterial property against the Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli . Using Scanning electron microscopy, homogeneous dispersion and uniform particle size was viewed in the biopolymer. X-ray diffraction studies of iron particles organization in Senegalia senegal also showed that the main portion of iron was crystalline and in the form of FeO and Fe 0 . X-ray photoelectron spectroscopy was used to evaluate the chemical composition of the surface but no appreciable peak was measured for the iron before Ar etching. These results suggest that the surface of iron nanoparticles consist mainly of a layer of iron oxides in the form of FeO. Thermal gravimetric analysis was used to determine the thermal stability and absorbed moisture content. |
| Databáze: | OpenAIRE |
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