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i LỜI CAM ĐOAN Tơi xin cam đoan cơng trình kết nghiên cứu riêng tôi, thực hướng dẫn khoa học PGS TS Nguyễn Thị Vƣơng Hoàn TS Lê Thị Thanh Thúy Các số liệu, kết nêu luận văn trung thực chưa công bố cơng trình nghiên cứu Tơi xin chịu tránh nhiệm nghiên cứu Học Viên a lu n n va p ie gh tn to Nguyễn Thị Thúy d oa nl w f an nv a lu oi lm ul at nh z z om l.c gm @ an Lu n va ac th si ii LỜI CẢM ƠN Tơi xin bày tỏ lịng biết ơn sâu sắc tới PGS TS Nguyễn Thị Vƣơng Hoàn TS Lê Thị Thanh Thúy – tận tình hướng dẫn, giúp đỡ, bảo động viên tơi hồn thành tốt luận văn Trong q trình thực luận văn nhận nhiều quan tâm tạo điều kiện Thầy, Cô khoa Khoa học tự nhiên - Trường Đại học Quy Nhơn Tơi xin bày tỏ lịng cảm ơn chân thành tới quý Thầy, Cô a lu Tôi xin chân thành cảm ơn gia đình, bạn bè tập thể lớp Cao học Hóa n n va K21 ln động viên, khích lệ tinh thần suốt q trình học tập Mặc dù cố gắng thời gian thực luận văn cịn p ie gh tn to nghiên cứu khoa học hạn chế kiến thức thời gian, kinh nghiệm nghiên cứu nên không oa nl w tránh khỏi thiếu sót Rất mong nhận thơng cảm ý kiến đóng góp quý báu từ quý Thầy, Cơ để luận văn hồn thiện d Tơi xin chân thành cảm ơn! a lu nv Bình Định, tháng năm 2020 f an Học Viên oi lm ul nh at Nguyễn Thị Thúy z z om l.c gm @ an Lu n va ac th si iii MỤC LỤC Trang Trang phụ bìa LỜI CAM ĐOAN……………………………………………………………i LỜI CẢM ƠN……………………………………………………………….ii MỤC LỤC………………………………………………………………… iii DANH MỤC CHỮ VIẾT TẮT, KÍ HIỆU……………………………… vi a lu DANH MỤC CÁC BẢNG…………………………………………………vii n DANH MỤC CÁC HÌNH VẼ, ĐỒ THỊ………………………………….viii n va tn to MỞ ĐẦU Chƣơng 1: TỔNG QUAN p ie gh 1.1 Tổng quan graphit oa nl w 1.2 Tổng quan graphen oxit graphen oxit biến tính 1.2.1 Graphen oxit (GO) d 1.2.2 Graphen oxit biến tính 12 nv a lu 1.3 Vật liệu ferrite spinel NiFe2O4 16 f an 1.3.1 Cấu trúc vật liệu ferrite spinel 16 oi lm ul 1.3.2 Tính chất từ vật liệu ferrite spinel 17 1.3.3 Các yếu tố ảnh hưởng đến tính chất từ hệ hạt nano ferrite nh spinel 18 at z 1.3.4 Các phương pháp tổng hợp vật liệu ferrite spinel MFe2O4 25 z gm @ 1.3.5 Ứng dụng ferrite spinel MFe2O4 28 1.4 Vật liệu nanocomposite MFe2O4/GO GO biến tính 28 om l.c 1.5 Giới thiệu xúc tác quang 30 1.5.1 Khái niệm xúc tác quang 30 an Lu 1.5.2 Cơ chế phản ứng quang xúc tác 31 n va ac th si iv 1.6 Giới thiệu thuốc nhuộm hoạt tính RhB MB 37 1.6.1 Thuốc nhuộm hoạt tính RhB 37 1.6.2 Xanh metylen (MB) 38 Chƣơng 2: PHƢƠNG PHÁP NGHIÊN CỨU VÀ THỰC NGHIỆM 40 2.1 Thực nghiệm 40 2.1.1 Thiết bị hóa chất 40 2.1.2 Tổng hợp vật liệu 41 2.2 Các phƣơng pháp nghiên cứu 43 a lu 2.2.1 Phương pháp nhiễu xạ tia X (XRD)… 43 n 2.2.2 Phương pháp quang phổ hồng ngoại (FT-IR) 45 va n 2.2.3 Phương pháp quang phổ tia X phân tán lượng (EDX) 46 p ie gh tn to 2.2.4 Ảnh hiển vi điện tử quét (SEM) 47 2.2.5 Phương pháp hiển vi điện tử truyền qua (TEM) 47 2.2.6 Phổ quang điện tử tia X (EDX) 48 oa nl w 2.2.7 Từ kế mẫu rung (VSM) 49 2.2.8 Phương pháp phân tích nhiệt 49 d nv a lu 2.2.9 Phương pháp đẳng nhiệt hấp phụ - khử hấp phụ nitơ (BET) 50 f an 2.2.10 Phương pháp phổ phản xạ khuếch tán tử ngoại – khả kiến (UV- oi lm ul Vis DRS) 50 2.3 Khảo sát hoạt tính quang xúc tác phản ứng phân hủy RhB 53 at nh 2.3.1 Xây dựng đường chuẩn 53 z 2.3.2.Khảo sát hoạt tính quang xúc tác vật liệu phản ứng z @ phân hủy RhB 55 gm 2.3.3 Nghiên cứu động học trình xúc tác 59 om l.c Chƣơng 3: KẾT QUẢ VÀ THẢO LUẬN 62 3.1 Đặc trƣng vật liệu 62 an Lu 3.1.1 Vật liệu niken ferrite (NF) 62 n va ac th si v 3.1.2 Vật liệu graphen oxit, graphen oxit biến tính 69 3.1.3 Vật liệu composite NF/ GO-N NF/ GO-N,S 77 3.2 hảo sát hoạt t nh úc tác quang vật liệu 91 3.2.1 hảo sát thời gian đạt cân b ng hấp phụ 91 3.2.2 Đánh giá hoạt tính xúc tác quang vật liệu phản ứng phân hủy RhB 92 3.2.3 hảo sát yếu tố ảnh hưởng đến hiệu suất xúc tác quang vật liệu 94 a lu 3.3 Nghiên cứu động học phản ứng quang úc tác vật liệu n composite NF/GO-N,S 97 n va 3.4 Nghiên cứu chế phản ứng 100 tn to 3.5 tái sử dụng vật liệu 103 p ie gh ẾT LUẬN VÀ IẾN NGHỊ 105 I KẾT LUẬN 105 oa nl w II KIẾN NGHỊ 107 DANH MỤC CƠNG TRÌNH KHOA HỌC ĐÃ CƠNG BỐ 108 d nv a lu TÀI LIỆU THAM KHẢO 109 f an QUYẾT ĐỊNH GIAO ĐỀ TÀI LUẬN VĂN THẠC SĨ( Bản sao) oi lm ul at nh z z om l.c gm @ an Lu n va ac th si vi DANH MỤC CÁC TỪ VIẾT TẮT, Í HIỆU AOPs Q trình oxi hóa nâng cao (Advance Oxidation Process) BET Phương pháp đẳng nhiệt hấp phụ - khử hấp phụ nitơ (BnenceuerEmmett- Teller) CB Vùng dẫn (Conduction Band) e CB- Electron quang sinh (Photoelectron electron) EDX Phương pháp phổ tán xạ lượng tia X (Energy Dispersive XRay Spectroscopy) a lu n n va Năng lượng vùng cấm (Band gap energy) GO Graphen oxit (Graphene oxide) h+VB Lỗ trống quang sinh (Optical birth hole) HĐBM Hoạt động bề mặt (Surface active agent) p ie gh tn to Eg Phương pháp phổ hồng ngoại (Infrared Spectroscopy) IR NF Xanh Methylen oa nl w MB Niken ferrite (NiFe2O4) d Rhodamine B SEM Phương pháp hiển vi điện tử quét (Scanning Electron f an nv a lu RhB Microscopy) Hiển vi điện tử truyền qua (Transmission Electron Microscopy) oi lm Phổ hấp thụ phân tử (Ultraviolet-visible) nh UV-Vis ul TEM at UV-Vis DRS Phương pháp phổ phản xạ khuếch tán tử ngoại-khả kiến z z (Ultraviolet-visible Diffuse Reflectance Spectra) gm Vùng hóa trị (Valence band) @ VB Từ kế mẫu rung (Vibrating Sample Magnetmeter) XPS Phổ quang điện tử tia X( X-ray photoelectron spectroscopy-XPS) XRD Nhiễu xạ tia X( X-Ray Diffraction) om l.c VSM an Lu n va ac th si vii DANH MỤC CÁC BẢNG BIỂU Bảng 1 Thơng số bán kính số ion kim loại ·························· 16 Bảng Phân bố ion vị trí cấu trúc spine ······················ 17 Bảng Tính chất từ số hệ hạt nano có hình dạng khác nhau.····· 19 Bảng Ảnh hưởng thành phần đến tính chất từ ····················· 22 Bảng Thế oxi hóa chất oxy hóa điển hình ························· 33 Bảng Các loại hóa chất sử dụng đề tài ························ 40 Bảng 2 Các thí nghiệm chuẩn bị xây dựng đường chuẩn RhB·············· 53 a lu n Bảng Các thí nghiệm chuẩn bị xây dựng đường chuẩn MB ·············· 54 n va Bảng Thành phần nguyên tử nguyên tố có NF ·················· 67 p ie gh tn to Bảng Thành phần phần trăm nguyên tử nguyên tố graphit; GO GO-N, GO-N,S ······················································· 77 Bảng 3 Các thông số đặc trưng của NF/GO-N NF/GO-N,S ········ 82 oa nl w Bảng Phần trăm nguyên tố mẫu NF; NF/GO; NF/GO-N; NF/GO-N,S ······························································ 83 d a lu Bảng Năng lượng vùng cấm vật liệu ······························· 93 f an nv Bảng Hằng số tốc độ k phản ứng theo mơ hình Langmuir – Hinshelwood ····························································· 98 ul oi lm Bảng Hằng số tốc độ phản ứng theo mơ hình Langmuir – nh Hinshelwood ··························································· 100 at Bảng Hiệu suất xúc tác quang chất xúc tác NF/GO-N,S với chất z z dập tắt ··································································· 102 om l.c gm @ an Lu n va ac th si viii DANH MỤC HÌNH VẼ, ĐỒ THỊ Hình 1.1 Cấu trúc tinh thể kim cương graphit (3D)······················ Hình Sơ đồ tạo Graphen oxit từ graphit ······································ Hình Cấu trúc GO theo Lerf – Klinowski ······························· Hình Liên kết hydro lớp graphit oxit ······························ 10 Hình Cấu tạo liên kết nguyên tử nitrogen N-graphene········· 13 Hình Cấu trúc hình thành vật liệu nanocomposite MnO2/N-GO····· 14 Hình Sơ đồ tổng hợp graphen dopping N,S ································· 15 a lu n Hình 8.Cấu trúc tinh thể củaferrite spinel ······································ 16 n va Hình Sự phụ thuộc Ms vào nồng độ pha tạp Zn2+ hệ nano tn to ZnxM1-x Fe2O4 (M=Fe, Mn) ············································· 21 p ie gh Hình 10 Sự phụ thuộc mômen từ vào từ trường H (a) H/T (b) nhiệt độ khác hạt nano Fe có kích thước D = 4,4 nm ···· 23 oa nl w Hình 11 Lực kháng từ phụ thuộc vào kích thước hạt···················· 24 Hình 12 Đường M(H) với kích thước khác (a) phụ thuộc lực d a lu kháng từ vào kích thước hệ hạt nano Fe3O4 300 K (b) ···· 25 f an nv Hình 13 Đường M(H) với kích thước khác (a) phụ thuộc lực ul kháng từ vào kích thước mẫu Co0,4Fe2,6O4(b) ··············· 25 oi lm Hình 14 Cơ chế phản ứng xúc tác quang hóa dị thể ························· 32 nh Hình 15 Sơ đồ biểu diễn chế oxi hóa ······································ 34 at Hình 16 Sơ đồ biểu diễn chế khử ··········································· 35 z z Hình 17 Cơ chế xúc tác quang vật liệu biến tính A B chất bán @ gm dẫn ····················································································· 36 om l.c Hình 18 Cơng thức hóa học RhB ·········································· 38 Hình 1.19 Công thức 3,7-bis(Dimethylamino)-phenothiazin-5-ium an Lu chloride (hay xanh metylen) ··········································· 38 n va ac th si C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an ix Hình Sơ đồ nhiễu xạ Rơnghen ··············································· 44 Hình 2 Sơ đồ tia tới tia························································ 44 Hình Độ tù peak phản xạ gây kích thước hạt ···················· 44 Hình Phổ UV- Vis RhB ··················································· 53 Hình Đường chuẩn Rhodamine B (RhB) ······························· 54 Hình Phổ UV- Vis MB ···················································· 55 Hình Đường chuẩn xanh metylen (MB) ································ 55 Hình Giản đồ XRD NF nung nhiệt độ 3500C (a), 4000C (b), a lu 4500C (c), 5000C (d) 7000C (e) ······································ 62 n Hình 3.2 Giản đồ phân tích nhiệt NF ········································· 63 n va Hình 3 Ảnh TEM mẫu NF-4500C (a), NF-5000C (b) NF-7000C tn to (c) ·········································································· 64 p ie gh Hình Giản đồ XRD NF tỉ lệ mol Fe3+ Ni2+ khác nhau······ 65 Hình Phổ EDX vật liệu NF tỉ lệ khác nhau······················ 66 oa nl w Hình Đường cong từ trễ mẫu NF tổng hợp tỉ lệ mol Fe3+ Ni2+ khác nhau···························································· 67 d nv a lu Hình Đồ thị biểu diễn phụ thuộc C/Co theo thời gian vật liệu NF f an tỉ lệ ································································· 68 oi lm ul Hình Phổ XPS tồn phần (a), Ni2p (b), Fe2p (c) O1s (d) vật liệu NF 2,0:1,0 ································································· 70 at nh Hình Giản đồ nhiễu xạ tia X GO; GO-N1,0 ; GO-N1,5 z GO-N2,0 ·································································· 71 z Hình 10 Giản đồ nhiễu xạ tia X GO; GO-N,S1,0 ; GO-N,S1,5 gm @ GO-N,S2,0 ···························································· 72 om l.c Hình 11 Phổ FT-IR mẫu GO mẫu GO-N-1; GO-N-1,5 ; GO-N-2,0 ································································ 74 an Lu Hình 12 Phổ FT-IR mẫu GO mẫu GO-N,S1,0 ; GO-N,S1,5; n va ac th Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn si C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an x GO-N,S2,0 ······························································ 74 Hình 3.13 Đồ thị biểu diễn phụ thuộc C/Co theo thời gian mẫu vật liệu GO-N tỉ lệ khác ············································ 75 Hình 14 Đồ thị biểu diễn phụ thuộc C/Co theo thời gian mẫu vật liệu GO-N,S tỉ lệ khác ···································· 76 Hình 15 Giản đồ nhiễu xạ tia X GO, NF, NF/GO-N NF/ GO-N,S ····························································· 78 Hình 16 Phổ IR GO; GO-N; GO-N,S; NF; NF– GO-N a lu NF– GO-N,S ··························································· 78 n Hình 17 Ảnh SEM composite NF/GO-N, NF/GO-N,S ············ 79 n va Hình 18 Ảnh TEM composite NF/GO-N NF/GO-N,S ········· 80 tn to Hình 19 Đường đẳng nhiệt hấp phụ- khử hấp phụ N2 77 K NF/GO-N p ie gh NF/GO-N,S ·························································· 80 Hình 20 Đường cong từ trễ NF, NF/GO-N NF/GO-N,S ············ 81 oa nl w Hình 21 Phổ XPS toàn phần NF, NF/GO NF/GO-N; NF/GO-N,S ··· ·························································································· 82 d nv a lu Hình 22 Phổ XPS phân giải cao C1s NF/GO-N,S ················ 84 f an Hình 23 Phổ XPS phân giải cao O1s NF/GO-N,S ················ 84 oi lm ul Hình 24 Phổ XPS Fe2p NF, NF/GO-N, NF/GO-N,S ············ 85 Hình 25 Phổ XPS Ni2p NF/GO-N,S ······························· 86 at nh Hình 26 Phổ XPS N1s, S2p NF/GO-N,S ························· 87 z Hình 27 Phổ XPS phân giải cao O1s NF, NF/GO-N, z @ NF/GO-N,S······························································ 88 gm Hình 28 Phổ UV-Vis trạng thái rắn NF, NF/GO-N NF/GO-N,S··· 89 om l.c Hình 29 Đồ thị phụ thuộc (F(R)hϑ)2 theo lượng ánh sáng bị hấp thụ NF, NF/GO-N NF/GO-N,S ························· 90 an Lu Hình 30 Dung lượng hấp phụ RhB theo thời gian mẫu NF, GO-N, n va ac th Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn si C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 109 TÀI LIỆU THAM HẢO TÀI LIỆU TIẾNG VIỆT [1] Lê Thị Mai Hoa, Hà Quang Ánh, Lê Hà Giang, Nguyễn Kế Quang, Ngô Tiến Quyết, Quản Thị Thu Trang Vũ Anh Tuấn, Study on dye reactive RR 195 photodegradation ability from aqueous solution by CoFe2O4/ GO composite, Tạp chí Xúc tác hấp phụ, ISSN 0866-7411, T4, N0 2, 39-44 (2015) [2] Lê Thị Mai Hoa, Hà Quang Ánh, Lê Hà Giang, Nguyễn Kế Quang, a lu Đào Đức Cảnh, Nguyễn Thị Phương, Trần Thị Kim Hoa, Đặng Tuyết n Phương Vũ Anh Tuấn, Synthesis, characterization and application n va of novel MnFe2O4- rGO composite in photocatalytic degradation of tn to reactive dye, Proceedings of IWNA 2015,11-14 November 2015, Vung p ie gh Tau, Viet Nam pp 513-516 [3] Nguyễn Hữu Đức (2008), Vật liệu từ cấu trúc nano điện t spin, Nhà oa nl w xuất đại học Quốc gia Hà Nội: pp 49-53 [4] Nguyễn Hữu Hiếu, Đặng Thị Minh Kiều, Phan Thị Hoài Diễm, Tổng hợp d lý nước thải, Tạp chí phát triển nv a lu Fe3O4/ graphen oxit nanocomposit để x f an KH&CN, tập 18, số T6, 212-220 (2015) oi lm ul [5] Nguyen Thi Vuong Hoan , Nguyen Ngoc Minh, Thoi Thi Kim Nhi, Nguyen Van Thang, Vu Anh Tuan , Vo Thang Nguyen, Nguyen Mau Thanh, Nguyen at nh Van Hung and Dinh Quang Khieu, TiO2/Diazonium/Graphene Oxide z Composites: Synthesis and Visible-Light-Driven Photocatalytic Degradation z Methylene Blue, Journal of Nanomaterials Volume 2020, Article ID 4350125, 15 pages gm @ of om l.c [6] Nguyen Thi Vuong Hoan, Nguyen Thi Anh Thu, Hoang Van Duc, Nguyen Duc Cuong, Dinh Quang Khieu, and Vien Vo, Fe3O4/Reduced Graphene an Lu Oxide Nanocomposite: Synthesis and Its Application for Toxic Metal Ion n va ac th Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn si C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan 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77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn si C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 111 nanostructures as oxygen-reduction catalysts Topics in Catalysis, 2009 52(11): p 1566-1574 [17] Boroski, M., et al., Combined electrocoagulation and TiO2 photoassisted treatment applied to wastewater effluents from pharmaceutical and cosmetic industries Journal of hazardous materials, 2009 162(1): 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Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn si C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an 122 [123] B., Zhen G., Muir B.W., Moffat B.A., Harbour P., Murray K.S., Moubaraki Suzuki K., Madsen I., Agron-Olshina N., Waddington L (2011),Comparative 171 study of magnetic behavior of spherical and cubicsuperparamagneticironoxide nanoparticles, The Journal of Physical Chemistry C, 115: pp 327–334 a lu n n va p ie gh tn to d oa nl w f an nv a lu oi lm ul at nh z z om l.c gm @ an Lu n va ac th Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn si C.33.44.55.54.78.65.5.43.22.2.4 22.Tai lieu Luan 66.55.77.99 van Luan an.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.C.33.44.55.54.78.655.43.22.2.4.55.22 Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an Stt.010.Mssv.BKD002ac.email.ninhd 77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77.77.99.44.45.67.22.55.77.C.37.99.44.45.67.22.55.77t@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn