بررسی مقایسه‌ای تأثیر افزودن نانوذرات دیوپسید و سیلیکا سولفوریک اسید بر خواص مکانیکی سیمان‌های گلاس آینومر

نویسندگان

1 1- دانشکده فنی مهندسی، دانشگاه شهرکرد

2 2- دانشکده شیمی، دانشگاه آزاد اسلامی شهرکرد

چکیده

هدف از اجرای پژوهش حاضر، بررسی مقایسه­ای اثر افزودن نانوذرات بیوسرامیک دیوپسید و سیلیکا سولفوریک اسید به جزء سرامیکی سیمان گلاس آینومر، به‌منظور ارتقاء خواص مکانیکی آن بود. به این منظور، ابتدا نانوذرات دیوپسید (DIO) با ترکیب شیمیایی (CaMgSi2O6)، به روش سل- ژل ساخته و مشخصات ساختاری و مورفولوژی نانوذرات دیوپسید تعیین شد. نتایج بررسی میکروسکوپی الکترونی (SEM) و اندازه گیری توزیع ذرات لیزری (PSA)، ابعاد نانومتری دیوپسید و آگلومره بودن ذرات آن را نشان داد. هم‌چنین نتایج آزمون پراش پرتو ایکس، خالص بودن ترکیب نانو ذرات دیوپسید را تأیید نمود. نانوذرات سیلیکا سولفوریک اسید(SSA)، نیز از طریق اصلاح شیمیایی سطح نانوذرات سیلیس توسط کلروسولفونیک اسید ساخته شده و از آزمون طیف سنجی تبدیل فوریه فروسرخ (FTIR) برای تأیید حضور گروه‌های (SO3H) بر روی سطح این نانوذرات استفاده شد. در ادامه، با افزودن نانوذرات دیوپسید و سیلیکا سولفوریک اسید در مقادیر 1/0، 3 و 5 درصد وزنی به جزء سرامیکی سیمان گلاس آینومر تجاری (Fuji II GIC)، نانوکامپوزیت ­های سیمان گلاس آینومر ساخته شد و از آزمون­های استحکام فشاری، خمشی به روش سه نقطه‌ای و کششی قطری برای بررسی خواص مکانیکی آن‌ها استفاده شد. نتایج آزمون طیف سنجی تبدیل فوریه فروسرخ، حضورگروه ­های (SO3H) را در سطح نانوذرات سیلیس نشان داد. مقادیر استحکام فشاری، استحکام خمشی و استحکام کششی قطری سیمان گلاس آینومر بدون افزودنی به‌ترتیب 5/42 ، 4/15 و6 مگاپاسکال بود. اگرچه افزودن یک درصد سیلیکا سولفوریک اسید در حدود 122 درصد این خواص را بهبود داد اما بیشترین میزان افزایش در خواص مکانیکی نانوکامپوزیت­ های حاوی 3 درصد دیوپسید بود که رشد
160 درصدی را نشان داد.

کلیدواژه‌ها

عنوان مقاله [English]

A Comparative Study of the Addition Effect of Diopside and Silica Sulfuric Acid Nanoparticles on Mechanical Properties of Glass Ionomer Cements

نویسندگان [English]

  • M. Rezazadeh 1
  • M.R. Saeri 1
  • F. Tirgir Malkhlifeh 2
  • A. Doostmohammdi 1
1 1. Department of Materials Engineering, University of Shahrekord, Shahrekord, Iran
2 2. Department of Chemistry, Science Faculty, Islamic Azad University, Shahrekord Branch, Shahrekord, Iran
چکیده [English]

The aim of the present study is to study the effects of adding  diopside (CaMgSi2O6) as well as silica sulfuric acid nanoparticles to ceramic part of glass ionomer cement (GIC) in order to improve its mechanical properties. To do this, firstly, diopside (DIO) nanoparticles with chemical formula of CaMgSi2O6 were synthesized using sol-gel process and then, the structural and morphological properties of synthesized diopside nanoparticles were investigated. The results of scanning electron microscopy (SEM) and particle size analyzing (PSA) confirmed that synthesized diopside are nanoparticles and agglomerated. Besides, the result of X-ray diffraction (XRD) analyses approved the purity of diopside nanoparticles compounds. Silica sulfuric acid (SSA) nanoparticles are also prepared by chemical modification of silica nanoparticles by means of chlorosulfonic acid. Fourier transform infrared spectroscopy (FTIR) technique was used to find about the presence of the (SO3H) groups on the surface of silica sulfuric acid nanoparticles. Furthermore, various amounts (0.1, 3 and 5 wt.%) of diopside and silica sulfuric acid nanoparticles were added to the ceramic part of GIC (Fuji II GIC commercial type) to produce glass ionomer cement nanocomposites. The mechanical properties of the produced nanocomposites were measured using the compressive strength, three-point flexural strength and diametral tensile strength methods. Fourier transform infrared spectroscopy technique confirmed the presence of the (SO3H) groups on the surface of silica nanoparticles. The compressive strength, three-point flexural strength and diametral tensile strength were 42.5, 15.4 and 6 MPa, respectively, without addition. Although adding 1% silica solfonic acid improved nanocomposite mchanical properties by almost 122%, but maximum increase in nanocomposite mechanical properties was observed in the nanocomposites with 3% diposid, in which 160% increase was seen in the mechanical properties.

کلیدواژه‌ها [English]

  • Glass ionomer cement
  • Diopside nanoparticles
  • Silica sulfuric acid
  • Sol-gel
  • mechanical properties

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مواد پیشرفته در مهندسی
دوره 35، شماره 2
شهریور 1395
صفحه 131-144

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