مواد پیشرفته در مهندسی

مواد پیشرفته در مهندسی

مطالعه تاثیر آلایش اکسید استرانسیم در ترکیب شیمیایی شیشه زیست‌فعال بر توزیع اکسیژن‌های پل‌زن/غیرپل‌زن با استفاده از شبیه‌سازی دینامیک مولکولی

نوع مقاله : مقاله پژوهشی

نویسنده
مهندسی مواد، دانشگاه بین‌المللی امام خمینی (ره)، قزوین، ایران
چکیده
مقدمه و اهداف: استفاده از شیشه‌های زیست‌فعال در کاربردهای درمانی به‌منظور بهبود روند درمان، یک زمینه تحقیقاتی امیدوارکننده درحال‌توسعه می‌باشد که این مواد زیستی را به یکی از گزینه‌های قابل‌اطمینان در مهندسی بافت تبدیل کرده است. در این پژوهش، تاثیر آلایش اکسید استرانسیم در ترکیب شیمیایی شیشه زیست‌فعال 70S بر خواص ساختاری و زیستی آن بررسی گردید.
مواد و روش‌ها: در این پژوهش، ساختار شیشه زیست‌فعال (درصد مولی 5 و 0 =x) 70SiO2-(30-x)CaO-xSrO سنتزشده به روش ذوبی-آبدهی، از طریق دینامیک مولکولی و نرم‌افزار لمپس شبیه‌سازی شد.
یافته‌ها: با توجه به نتایج حاصل از تابع توزیع پیوندی و تابع توزیع زاویه‌ای، میانگین طول پیوندهای Si-O و Si-BO و Si-NBO، به‌ترتیب 1/61 و 1/62 و 1/58 Å گزارش گردید و اندازه زاویه پیوند Si-O-Si و O-Si-O، به‌ترتیب در محدوده 151-147 درجه و 109 درجه بود. همچنین میزان توزیع اکسیژن‌های پل‌زن و غیرپل‌زن در نمونه BG-S5 نسبت به نمونه BG-S10، به‌ترتیب 0/42 و 0/21 درصد کاهش و افزایش یافت. ضمن این‌که افزایش pH محلول شبیه‌سازی‌شده بدن تا روز هفت غوطه‌وری، به دلیل رهایش یون‌ها از سطح شیشه گزارش شد و بهبود 17/26 درصدی رشد و تکثیر سلول‌های MC3T3-E1 در نمونه BG-S5 نسبت به نمونه BG-S10 در روز هفت کشت تایید گردید (0/0001نتیجه‌گیری: شبیه‌سازی دینامیک مولکولی یک ابزار قدرتمند به‌منظور پیش‌بینی دقیق خواص ساختاری شیشه‌های زیست‌فعال قبل از سنتز در شرایط برون‌تنی است و نمونه BG-S5 به دلیل داشتن قابلیت‌های زیستی بهینه، به‌منظور استفاده در مهندسی بافت استخوان پیشنهاد گردید.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Studying the Effect of Strontium Oxide Doping in the Chemical Composition of Bioactive Glass on the Distribution of Bridging/Non-Bridging Oxygens Using Molecular Dynamics Simulation

نویسنده English

Amirhossein Moghanian
Department of Materials Engineering, Imam Khomeini International University, Qazvin, Iran
چکیده English

Introduction and Objectives: The use of bioactive glass in therapeutic applications is a promising and developing field of research to improve the treatment process, made these biomaterials one of the reliable options in tissue engineering. In this study, the effect of strontium oxide contamination in the chemical composition of bioactive glass 70S on its structural and biological properties was examined.
Materials and Methods: In this study, the structure of bioactive glass 70SiO2-(30-x)CaO-xSrO (x= 0 and 5 mol.%) synthesized by melt-quenching method was simulated through molecular dynamics and lAMMPS software.
Results: According to the results of the pair distribution function and the angle distribution function, the average length of the Si-O, Si-BO, and Si-NBO bonds was reported to be 1.61, 1.62, and 1.58 (Å) respectively, and the angle size of the Si-O-Si and O-Si-O bonds was 147-151° and 109°, respectively. The distribution of bridging oxygens and non-bridging oxygens in the BG-S5 sample also decreased and increased by 0.42% and 0.21%, respectively compared to the BG-S10 sample. In addition, an increase in the pH of the simulated body fluid was reported by the day of seven immersion due to the release of ions from the glass surface, and an improvement of 17.26 % in the growth and proliferation of MC3T3-E1 cells in the BG-S5 sample compared to the BG-S10 sample on the day of seven cultures was confirmed (****p<0.0001).
Conclusion: Molecular dynamics simulation is a powerful tool in order to accurately predict the structural properties of bioactive glass before synthesis in vitro conditions, and the BG-S5 sample was proposed in bone tissue engineering due to its optimal bioavailability.

کلیدواژه‌ها English

70S bioactive glass
In vitro
Melt-quenching method
Simulation of molecular dynamics
LAMMPS software
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