هیدروژل نانوکامپوزیتی پلی(وینیل‌الکل)-کیتوسان-نانوخاک‌رس-نانونقره پاسخگو به محرک سه‌گانه

نوع مقاله: پژوهشی

نویسندگان

تهران، دانشگاه تربیت مدرس، دانشکده مهندسی شیمی، گروه مهندسی پلیمر، صندوق پستی 114-14115

چکیده

فرضیه: حساس‌کردن سامانه‌های هیدروژلی نانوکامپوزیتی به محرک چندگانه متضمن افزایش کارایی آن‌ها از ‌نظر سرعت و دامنه پاسخگویی است. افزودن نانونقره به سامانه هیدروژلی نانوکامپوزیتی کیتوسان-پلی(وینیل الکل)-نانوخاک‌رس حساس به محرک دوگانه (دما و pH)، موجب افزایش حساسیت سامانه انتخاب‌شده به محرک سوم یعنی میدان الکتریکی و در نتیجه افزایش سرعت پاسخگویی کلی سامانه می‌شود.
روش‌ها: در این پژوهش، کاهش نمک نقره به نانونقره با روش سنتز سبز در سامانه هیدروژل نانوکامپوزیتی کیتوسان-پلی(وینیل الکل)-نانوخاک‌رس و استفاده از کاهنده کیتوسان و پایدارکننده پلی(وینیل الکل) انجام شد. تشکیل نانونقره با آزمون طیف‌نمایی UV-Vis و نحوه توزیع و پراکنش آن‌ها در سامانه نانوکامپوزیتی با آزمون میکروسکوپی الکترونی پویشی بررسی شد. بررسی مشخصه‌های ساختاری نانوکامپوزیت هیدروژلی با آزمون FTIR انجام شد. ولت‌سنجی چرخه‌ای برای ارزیابی رسانندگی الکتریکی سامانه به‌کار گرفته شد.
یافته‌ها: پیک ظاهرشده در طول موج محدوده 410nm به‌کمک طیف‌بینی UV-Vis، سنتز نانونقره را تأیید کرد. ریزنگار‌های SEM، توزیع و پراکنش یکنواخت نانونقره‌ را در سامانه نشان داد. نتایج حساسیت سامانه پاسخگو به محرک چندگانه نشان داد، وجود نانونقره، سرعت پاسخگویی سامانه را در محلول‌های اسیدی و بازی افزایش داده است. بیشینه نسبت تورم سامانه در pH برابر 2 و دمای 55 درجه سلسیوس و کمینه آن در pH برابر 5 و دمای 20 درجه سلسیوس مشاهده شد. وجود نانونقره موجب افزایش سه برابر سرعت پاسخگویی سامانه حساس به محرک دوگانه (دما و pH) و افزایش 1.5 برابر نسبت تورم آن شد. با اعمال میدان الکتریکی در pH برابر 2 زمان پاسخگویی سامانه از چند ساعت به چند دقیقه و نسبت تورم آن به 1.7 برابر افزایش یافت.

کلیدواژه‌ها


عنوان مقاله [English]

Triple Stimuli Responsive Poly(vinyl alcohol)Chitosan/Nanoclay/Nanosilver Nanocomposite Hydrogel

نویسندگان [English]

  • Vahide Jamali Firouzabadi
  • Mehrdad Kokabi
Polymer Engineering Department, Faculty of Chemical Engineering, P.O. Box: 14115-114, Tarbiat Modares University, Tehran, Iran
چکیده [English]

Hypothesis: Sensitizing the nanocomposite hydrogel systems to multiple stimuli ensures increasing their efficiency from the viewpoint of the magnitude and rate of response of the system. Adding nanosilver to dual stimuli (pH and temperature) responsive chitosan/poly(vinyl alcohol)/nanoclay nanocomposite hydrogel system increases the sensitivity of the chosen system to the third stimulus, i.e. the electric field, and enhances the overall rate of response of the system.
Methods: The reduction of a silver salt to silver nanoparticles was performed by a green synthesis method within the nanocomposite hydrogel system using chitosan as a reducing agent and polyvinyl alcohol as a stabilizer. Silver nanoparticle formation was investigated by UV-vis spectroscopy. SEM was used to study the distribution of silver nanoparticles in the nanocomposite system. The structural characterization of nanocomposite hydrogel was carried out by FTIR. Cyclic voltammetry was employed to evaluate the conductivity of the system.
Findings: The peak observed at the wavelength of 410 nm confirmed the synthesis of nanosilver. The SEM micrograph showed the uniform distribution of nanosilver in the system. The results of the sensitivity of the responsive system to multiple stimuli indicated that the nanosilver increased the rate of response of the system in acidic and alkaline solutions. The maximum swelling rate of the system was at pH 2 and the temperature of 55°C, while the minimum rate was at pH 5 and the temperature of 20°C. The presence of nanosilver increased the rate of response of dual stimuli (pH and temperature) responsive system up to three times and its swelling rate to 1.5 times. By applying an electric field at pH 2, the time of response of system decreased from hours to minutes and its swelling ratio increased up to 1.7 times.

کلیدواژه‌ها [English]

  • multi-stimuli
  • nanosilver
  • electrical field responsive
  • temperature and pH responsive
  • Nanocomposite
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