Nvestigation of surfaces of novel iron oxides with grain and grain boundary - Nguyen Viet Long4. CONCLUSION Iron oxide particles (α-Fe2O3) with grain and grain boundary textures were prepared by improved and modified polyol methods with NaBH4 and heat treatment at high temperature about 900-1000 °C according to the experiences of the author. The oxide grains were analyzed for the limitation of grain growth in the micro/nanoscale ranges....
8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 552 | Lượt tải: 0
Enhanced ferroelectricity and ferromagnetism of (Y, Ni) Co-Doped BiFeO3 materials - Dao Viet Thang4. CONCLUSIONS In summary, the effects of (Y, Ni) co-doping on the structure, ferroelectricity and ferromagnetism of the BiFeO3 material are investigated. As a result, the Bi1-xYxFe0.975Ni0.025O3 (BYFNO) (x = 0.00, 0.05, 0.10, and 0.15) materials behave a single phase of crystalline perovskite-type rhombohedral structure (R3C). It is found that...
6 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 639 | Lượt tải: 0
Near infrared – emitting Zn2SiO4 powders produced by high-Energy planetary ball milling technique4. CONCLUSION Near infrared Zn2SiO4 phosphor has been produced successfully by high-energy ball milling technique followed by annealing in air. The XRD and Raman measurements reveal the formation of Zn2SiO4 phase with the annealing temperature of 1250 C. This high-temperature annealing powder emits intensively in the near infrared peaking at 74...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 540 | Lượt tải: 0
Study on synthesis of MnFe2O4/GnPS composite and application on heavy metal removal - Nguyen Duy Anh4. CONCLUSION By usinng solvothermal method, graphene nanoplatelets and its magnetic composite MnFe2O4/GNPs were succesfully synthesized, as confirmed by XRD method. The condition of reaction was studied and 200 °C was the proper temperature, at lower temperature, undesired products were formed instead. The morphology and size of crystal were e...
8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 560 | Lượt tải: 0
Bài giảng Hóa công nghệ - Chương 2: Sản xuất Axit SunfuricNhiệm vụ tháp tăng ẩm: • Tăng kích thước hạt mù axit • Giảm nhiệt độ xuống thêm 3-50C Nếu quặng chứa nhiều hợp chất flo (HF, SiF4) thì dùng kiểu tháp rửa I, ngược lại dùng tháp rửa II
50 trang | Chia sẻ: yendt2356 | Ngày: 28/11/2020 | Lượt xem: 801 | Lượt tải: 0
Fabrication and properties of co doped B9i0.5)K(0.5)TiO3 – BiFeO3 solid solution - Nguyen Hoang Tuan4. CONCLUSION In summary, we have studied the structural, magnetic properties of solid solution 0.9Bi0.5K0.5TiO3 + 0.1BiFe1-xCoxO3. The results were in good agreement with the previous reports of BKT – BFO and BKT-BCO solid solutions. The magnetic properties were investigated via unsaturated M-H loop, which showed the competition of paramagneti...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 539 | Lượt tải: 0
Bài giảng Hóa đại cương - Chương 2: Liên kết hóa học và cấu tạo phân tửCấu hình e hóa trị 3s của Na: Miền hóa trị chỉ có IN e nên nó chỉ mới được điền đầy một nửa. Một nửa miền còn lại tự do và đóng vai trò miền dẫn. Khi kích thích nhẹ, ví dụ tác dụng lên kim loại một điện trường, các e hóa trị dễ dàng chuyển lên những orbital còn tự do theo hướng của điện trường, thể hiện tính dẫn điện.
89 trang | Chia sẻ: yendt2356 | Ngày: 28/11/2020 | Lượt xem: 788 | Lượt tải: 0
Synthesis of nanosilica from rice husk and optimization of the removal of crystal violet dye from aqueous solution - Nguyen Van Hung4. CONCLUSIONS This paper reports our first results on the synthesis of nanosilica from rice husk. The nanosilica is an effective adsorbent for the removal of CV dye from aqueous solutions and theSynthesis of nanosilica from rice husk and optimization of the removal of crystal violet dye best removal yields were investigated with contact time...
8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 540 | Lượt tải: 0
A study of red-Emitting phosphor of K2SiF6:Mn4+ for warm white leds - Nguyen Le Anh4. CONCLUSION In summary, we have reported the first of out attempt to creation of the Mn4+-doped K2SiF6 phosphor by one step co-precipitation process. Concequently, pure phase of cubic K2SiF6 is achieved. K2SiF6 doped 5 % content of Mn4+ shows the strong emission in red light spectrum corresponding to the 609, 614, 631, 635 and 647 nm emission...
6 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 553 | Lượt tải: 0
Magnetic resonance imaging (MRI) application of Fe3O4 based ferrofluid synthesized by thermal decomposition using poly (maleic anhydride -Alt-1- Octadecene) (pmao) - Le The Tam4. CONCLUSION In this work, high-quality magnetic fluid was synthesized by thermal decomposition with using poly (maleic anhydride -alt-1-octadecene) (PMAO) as phase transfer ligand. The additional organic coating layer has improved the stability of magnetic particles in aqueous solutions. The average diameter of the coated particles was 16.1 ±...
9 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 586 | Lượt tải: 0
