نانومقیاس

نانومقیاس

ساخت نانو رنگدانه هیبریدی بر پایه نانو رس مونت موریلونیت سدیم و پودر گل چای ترش و ارزیابی خواص حرارتی و ضدمیکروبی آن‌ها

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه مهندسی پلیمر، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد تهران جنوب، تهران، ایران
2 گروه شیمی، دانشکده علوم پایه، دانشگاه پیام نور، تهران، ایران
چکیده
در مقاله حاضر، مــواد رنگزا حاصله از گــل چای‌ تــرش (Hibiscus sabdariffa یا Hs) بــه صورت موفقیت‌آمیزی تحت واکنش تبادل یون، وارد فضای درون لایه رس مونت موریلونیت سدیم (Na+-MMT) گردید و یک نانو رنگدانه هیبریدی با نام (Hs-MMT) شکل گرفت. بــرای بـررسی مشخصه‌یابی و شکل‌شناسی (مورفولوژی) نانو رنگدانه Hs-MMT از آزمون‌های طیف سنجی مادون قرمز تبدیل فوریه (FTIR)، انکسار اشعه ایکس زاویه کوچک (SAXS)، میکروسکوپ الکترونی روبشی گسیل میدانی (FESEM) و طیف سنجی پراش انرژی پرتو ایکس (EDS) استفاده شد. همچنین رفتار حرارتی و ضدمیکروبی نانو رنگدانه Hs-MMT به ترتیب با آزمون‌های وزن سنجی حرارتی (TGA) و روش‌های چاهک و دیسک مورد ارزیابی قرار گرفت. نتایج آزمون FTIR، SAXS و EDS نشان داد که پس از برهم کنش دو فاز آلی و معدنی، گروه‌های عاملی Hs بر روی نانو رس ظاهر شد و همچنین درج مواد رنگزا Hs در فواصل بین لایه نانو رس، موجب افزایش صفحه به میزان 72/5 آنگستروم گردید. نتایج TGA حاکی از آن بود که صفحــات نانو رس مانع بارگذاری حرارت بر روی ساختار مواد رنگزا Hs شد و مــوجب پایداری حرارتی نانو رنگدانه Hs-MMT گردید. در نهایت نتایج آزمون ضدمیکروبی مؤید این بود که نانو رنگدانه Hs-MMT توانست دو نوع باکتری گِرَم مثبت و دو نوع باکتری گِرَم منفی را مهار و از بین ببرد به این صورت که کمینه غلظت کشندگی برای بـاکتری‌های گِرَم مثبت استافیلوکوکوس اورئوس و استرپتوک پیوژنز به ترتیب بــرابر با 250 و 25/31 میکروگرم بر میلی‌لیتر بود در حالیکه کمینه غلظت کشندگی برای باکتری‌های گِرَم منفی اشرشیا کلی و سالمونلا پاراتیفی برابر با 1000 میکروگرم بر میلی-لیتر بود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Fabrication of a hybrid nano-pigment based on sodium montmorillonite nanoclay and Hibiscus sabdariffa flower powder and assessment of their thermal and antimicrobial properties

نویسندگان English

Milad Edraki 1
Mohammad Banimahd Keivani 2
1 Department of Polymer Engineering, faculty of science and Engineering, South Tehran Branch, Islamic Azad University
2 Department of Chemistry, Payame Noor University (PNU), P. O. Box, 19395-3697, Tehran, Iran
چکیده English

In the present study, dyes derived from the Hibiscus sabdariffa flower (Hs) were successfully entered into the space inside the sodium montmorillonite clay layer (Na+-MMT) caused by the ion exchange reaction, and a hybrid nano-pigment called (Hs-MMT) was formed. To investigate and characterize the morphology of the Hs-MMT nano-pigment, Fourier transform infrared spectroscopy (FTIR), small angle X-ray scattering (SAXS), field emission scanning electron microscope (FESEM), and energy dispersive spectroscopy (EDS) were used. Also, both the thermal and antimicrobial behavior of Hs-MMT nano-pigment was evaluated by thermogravimetric analysis (TGA) and well and disc methods, respectively. The results of FTIR, SAXS, and EDS analyses showed that after the interaction of two organic and inorganic phases, the functional groups of Hs appeared on the nanoclay, and also the insertion of Hs dyes in the spaces between the layers of the nanoclay increased the surface by 5.72 angstrom .The TGA results indicated that the nanoclay plates prevented heat loading on the structure of Hs dyes and caused the thermal stability of Hs-MMT nano-pigments. Finally, the results of the antimicrobial test confirmed that Hs-MMT nano-pigment could hinder and destroy two types of gram-positive bacteria and two types of gram-negative bacteria, in such a way that the minimum bactericidal concentration of gram-positive bacteria i.e., Staphylococcus aureus and Streptococcus pyogenes was equal to 250 and 31.25 microgram per milliliter, respectively, while the minimum bactericidal concentration of gram-negative bacteria i.e., Escherichia coli and Salmonella paratyphi was equal to 1000 microgram per milliliter.

کلیدواژه‌ها English

Hibiscus sabdariffa flower powder
clay-based nano-pigments
antimicrobial properties
thermal stability
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دوره 11، شماره 2
تابستان 1403
صفحه 31-19

  • تاریخ دریافت 14 دی 1402
  • تاریخ بازنگری 17 اردیبهشت 1403
  • تاریخ پذیرش 31 تیر 1403