کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5440860 1398239 2017 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Complex ceramic architectures by directed assembly of 'responsive' particles
ترجمه فارسی عنوان
معماری سرامیک مجتمع توسط مونتاژ مستقیم ذرات "پاسخگو"
کلمات کلیدی
مأمور رهبری، کاربردکردن سطح، پلیمرهای پاسخ دهنده، سرامیک متخلخل متخلخل، امولسیون قالب،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
Surface functionalization of alumina powders with a responsive surfactant (BCS) leads to particles that react to a chemical switch. These 'responsive' building blocks are capable of assembling into macroscopic and complex ceramic structures. The aggregation follows a bottom up approach and can be easily controlled. The directed assembly of concentrated suspensions leads to highly dense (∼99%) ceramic components with average 4-point bending strength of ∼200 MPa. On the other hand, the emulsification of suspensions with concentrations from 7 to 43 vol% and 50 vol% decane results in emulsions with different properties (stability, droplet size and distribution). The oil droplets provide a soft template confining the alumina particles in the continuous phase and at the oil/water interfaces. Aggregation of these emulsions followed by drying and sintering leads to macroporous (pore sizes ranging from 30 to 4 μm) alumina structures with complex shapes and a wide range of microstructures, from closed cell structures to highly interconnected foams with total porosities up to 83%. Alumina scaffolds with ∼55% porosity can reach crushing strength values above 300 MPa in compression and ∼50 MPa in 4-point bending.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 37, Issue 1, January 2017, Pages 199-211
نویسندگان
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