NGHIÊN CỨU TÍNH CHẤT TỪ VÀ NHIỆT TỪ TRỊ CỦA HỆ HẠT NANÔ Co0,4Zn0,6Fe2O4=STUDY OF MAGNETIC PROPERTIES OF Co0,4Zn0,6Fe2O4 NANOPARTICLES FOR ADVANCED MAGNETIC HYPERTHEMIA

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Tác giả: Hùng Mạnh Đỗ, Văn Đăng Nguyễn, Hồng Nam Phạm, Thanh Phong Phạm, Thị Hồng Hoa Phạm, Hồng Kỳ Vũ

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2019

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Bộ sưu tập: Metadata

ID: 428261

Thêm vào giỏ

Magnetic properties of ferrites nanostructural with AIIFe2O4 formula (AII is 2 ion) can control the subtle for different applications. However, the effect of elements at the position of AII, size, shape and shell on magnetic properties is difficult to predict. This paper focuses on the magnetic properties and heating ability of Co0,4Zn0,6Fe2O4 nanoparticles (CoFe_Zn0,6) were fabricated by hydrothermal method and coated with chitosan (CoFe_Zn0,6/CS). X-ray diffraction patterns (XRD) and field emission scanning electron microscopy (FESEM) show a spinel structure for both the samples with an average particle size of about 15 nm and a fairly thin CS layer thickness. The saturation magnetization (Ms) at room temperature of CoFe_Zn0,6/CS is 50 emu/g and heating ability of magnetic fluid on this sample was investigated. The highest specific absorption rate value of about 280 W/g received on samples with a concentration of 1 mg/ml under magnetic of 250 Oe and frequency 290 kHz. This result shows that the magnetic fluid has an potential application for magnetic hyperthemia.Tính chất từ của các ferit cấu trúc nano với công thức AIIFe2O4 (AII là các ion hóa trị 2) có thể điều khiển tinh tế cho các ứng dụng riêng. Tuy nhiên, ảnh hưởng của các nguyên tố tại vị trí của AII, kích thước, hình dạng và lớp phủ tới các tính chất từ là khó tiên đoán. Bài báo này tập trung nghiên cứu các tính chất từ và khả năng đốt nóng của 2 mẫu hạt nano Co0,4Zn0,6Fe2O4 (CoFe_Zn0,6) được chế tạo bằng phương pháp thủy nhiệt (chưa bọc) và bọc bởi chitosan (CoFe_Zn0,6/CS). Giản đồ nhiễu xạ tia X và ảnh hiển vi điện tử quét phát xạ trường chỉ ra một cấu trúc spinel cho cả 2 mẫu với kích thước hạt trung bình khoảng 15 nm và độ dày lớp CS khá mỏng. Giá trị độ từ hóa bão hòa (Ms) trung bình tại nhiệt độ phòng của mẫu CoFe_Zn0,6/CS là 50 emu/g và khả năng đốt nóng của chất lỏng từ trên mẫu này đã được khảo sát. Công suất hấp thụ riêng (specific absorption rate –SAR) cao nhất khoảng 280 W/g nhận được trên mẫu có nồng độ 1 mg/ml dưới các điều kiện từ trường có cường độ 250 Oe và tần số 290 kHz cho thấy rằng chất lỏng từ này có khả năng ứng dụng cho nhiệt từ trị.

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