Magnetic amphiphilic nanocomposites produced via chemical vapor deposition of CH4 on Fe–Mo/nano-Al2O3
Authors: Aline A.S. Oliveira, Ivo F. Teixeira, Leandro P. Ribeiro, Eudes Lorençon, José D. Ardisson, Luis Fernandez-Outon, Waldemar A.A. Macedo, Flávia C.C. Moura
Abstract:
Catalytic chemical vapor deposition (CVD) using methane as carbon source was used to produce amphiphilic magnetic nanocomposites from Fe and Mo catalysts supported on alumina nanoparticles. The materials were reduced by hydrogen up to 900 ◦C and after were partially coated by carbon during a CVD process with CH4 also up to 900 ◦C. TPR results showed that the Fe and Mo phases present in the composites were reduced mainly to Fe0, Mo0 and iron carbide that consequently confers interesting magnetic properties to the materials. The materials produced with different Fe/Mo contents show saturation of magnetization between 1.1 and 28.1 emu g−1 . Thermal analyses, CHN, Raman spectroscopy, SEM, TEM, EDS and BET showed that the higher the metal content, the more carbon was deposited on the materials. Carbon content of the materials varies from 2 to 16% and it is distributed mainly as nanotubes and nanofibers. These composites present excellent interaction on the interface between oil and water and are able to form emulsions as well as to break other stable emulsions. This feature is strategic to these composites as catalysts to act on the interface of biphasic systems. Preliminary studies of the materials as catalysts on biphasic oxidation of lipophilic dye Sudan-IV showed very promising results.
Keywords:
Amphiphilic
Magnetic
Emulsions
Biphasic reactions
Published in: Applied catalysis A: General (Volume 456, Pages 1-248, 10 April 2013)
Publisher: Elsevier
ISSN Information: 0926-860X
Magnetic amphiphilic nanocomposites produced via chemical vapor deposition of CH4 on Fe–Mo/nano-Al2O3
- Ngày hội Văn hóa đọc lần VI
- Vòng Sơ Khảo Cuộc Thi Đại Sứ Văn Hóa Đọc Năm 2024
- Ngày hội sách “CITTADELLA” khuyến khích và tôn vinh vai trò của sách trong sinh viên Bách khoa
- Cuộc Thi Ảnh “Khoảnh Khắc VNUHCM Libraries”
- Ngày hội văn hóa đọc lần V
- Ngày hội văn hóa đọc lần II
- Ngày hội văn hóa đọc lần IV
- Ngày hội văn hóa đọc lần III
- Tiếp GS Omer Mert Denizci, Trường ĐH Marmara Thổ Nhĩ Kỳ
- Tiếp Cô Claudia Tarzariol Từ The University Of Trento, Italy (Unitrento)
- Tiến sĩ kiều bào Mỹ tặng sách trị giá 150.000 USD cho sinh viên bách khoa
- Khảo sát ý kiến bạn đọc
-
Trực tuyến:17
-
Hôm nay:1802
-
Tuần này:25870
-
Tuần trước:40192
-
Tháng trước:58663
-
Tất cả:4047766