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اثر نانوذرات رس بر خواص ساختاری و حرارتی فیلمهای نانوبیوپلیمری بر پایه کفیران | ||
| مهندسی بیوسیستم ایران | ||
| مقاله 6، دوره 47، شماره 3، آبان 1395، صفحه 441-449 اصل مقاله (602.81 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijbse.2016.59350 | ||
| نویسندگان | ||
| فرامرز خدائیان* 1؛ سهیلا اسمی2؛ سید سعید حسینی3 | ||
| 1هیات علمی دانشگاه تهران | ||
| 2دانشجو کارشناسی ارشد | ||
| 3دانشجوی کارشناسی ارشد | ||
| چکیده | ||
| کفیران یک اگزوپلیساکارید تولید شده توسط میکروارگانیسمهای دانک کفیر بوده که دارای خواص سلامت بخشی مختلفی است. در این پژوهش، خصوصیات فیزیکومکانیکی و حرارتی فیلمهای نانوکامپوزیتی تولید شده از کفیران- مونت موریلونیت (.0 1، 3 و 5 درصد وزنی/وزنی مونت موریلونیت) مورد مطالعه قرار گرفت. نتایج نشان داد افزایش نانورس سبب افزایش ضخامت و مقاومت کششی فیلمها میشود اما تاثیر آن بر کشش در نقطه شکست، دمای انتقال شیشهای و دمای ذوب در غلظتهای مختلف متفاوت است به طوری که تا غلظت 3 درصد سبب افزایش فاکتورهای مذکور و در غلظتهای بالاتر (5درصد) کاهش آنها را به دنبال دارد. تجزیه و تحلیل الگوی پراش اشعه ایکس نشان داد که یک ساختار متورق در اثر اضافه کردن مونت موریلونیت به ماتریکس کفیران ایجاد میشود. تصاویر میکروسکوپ الکترونی و نتایج توپوگرافی سطحی به ترتیب نشان دهنده توزیع مناسب نانوذرات مونتموریلونیت در ساختار فیلمهای بیو‌نانوکامپوزیتی و افزایش قابل توجه پارامترهای زبری در اثر افزودن نانورس به ماتریکس کفیران میباشند. | ||
| کلیدواژه‌ها | ||
| فیلم نانوکامپوزیت؛ کفیران؛ پراش پرتو ایکس؛ توپوگرافی سطحی | ||
| عنوان مقاله [English] | ||
| Effect of clay nanoparticle on structural and thermal properties of nano-biopolymer films based on kefiran | ||
| نویسندگان [English] | ||
| Faramarz Khodaiyan1؛ Sohyla Esmi2؛ Syed Saeid Hosseini3 | ||
| چکیده [English] | ||
| Kefiran is an exopolysaccharide produced by microorganisms present in the kefir grains that has several health promoting properties. In this research, physico-mechanical and thermal characteristics of nanocomposite film composed of kefiran-montmorillonite (MMT; 1, 3 and 5% w/w) were studied. Results showed that the thickness and the tensile strength of the films increased by increasing the nanoclay content but its effect on the elongation at break, glass transition temperature and melting temperature in various concentrations is different, so that these factors increase until concentration of 3% of the nanoclay and decrease in higher concentrations(5%). X-ray diffraction analysis showed that formation of an exfoliated structure with the addition of small amounts of MMT to the kefiran matrix. Scanning electron microscopy and the surface topography results showed ideal dispersion for MMT nanoparticles into the structure of the bio-nanocomposite films and a considerable increase in roughness parameters by incorporating the nanoparticles in kefiran matrix,respectively. | ||
| کلیدواژه‌ها [English] | ||
| Nanocomposite film, Kefiran, X-ray diffraction, Surface topography | ||
| مراجع | ||
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