1002-88-6Relevant articles and documents
Wet-chemical catalyst deposition for scalable synthesis of vertical aligned carbon nanotubes on metal substrates
Doerfler,Meier,Thieme,Nemeth,Althues,Kaskel
, p. 288 - 293 (2011)
A scalable process for carbon nanotube (CNT) growth on metallic substrates has been developed including dip-coating steps for the wet-chemical catalyst and co-catalyst layer deposition and a subsequent chemical vapor deposition step. Organic metal salt/2-propanol solutions were applied as precursors for alumina co-catalyst thin films and the actual Fe (Co, Mo) catalyst layer. Vertical aligned carbon nanotube forests were obtained on catalyst-coated nickel foil in a thermal CVD process at atmospheric pressure and 730 °C using ethene as carbon source. The influence of the catalyst composition on growth rate, density and structure of resulting CNT films was investigated.
Synthesis of biodiesel via homogeneous Lewis acid catalyst
Di Serio,Tesser,Dimiccoli,Cammarota,Nastasi,Santacesaria
, p. 111 - 115 (2005)
Nowadays, most biodiesel (fatty acids methyl esters, FAME) is produced by the transesterification of triglycerides (TG) of refined/edible type oils using methanol and an homogeneous alkaline catalyst. However, production costs are still rather high compared with the ones of petroleum-based diesel fuel. To lower costs and make biodiesel competitive less-expensive feedstocks such as waste fats or non-edible type oils could be used. The use of homogeneous alkaline catalysts in the transesterification of such types of fats and oils poses great difficulties due to the presence of large amounts of free fatty acids (FFA). This paper studies the use of carboxylic salts as a possible alternative, because these catalysts are active also in the presence of high FFA concentrations. The most active catalyst (Cd, Mn, Pb, Zn carboxylic salts) have been individuated and a correlation of the activities with the cation acidity has been found.
A water-bridged dinuclear complex of cobalt(II), pyridine and stearic acid
Corkery, Robert W.,Hockless, David C. R.
, p. 840 - 843 (1997)
In the crystal structure of μ-aqua-1:2κ2O-tetrapyridine-1κ 2N,2κ2N-bis(μ-stearato)-1κ 2O:2κ 2O′-bis(stearato)-1κO,2κO-dicobalt(II), [Co2(C18H35O2)4(C 5H5N)4-(H2O)], hydrogen bonding [with an O...O distance of 2.564 (5) A] between the H atoms of the bridging water and the non-metal-bonding O atoms of the monodentate stearic acid molecules, stabilizes the dimeric core complex and consequently limits chain packing and conformation options. The structure is a member of a rare class of compounds, the well crystallized metallic salts of long-chain fatty acids. The structure also bears a remarkable similarity to built-up Langmuir-Blodgett films of metal carboxylates.
Room Temperature Blocked Magnetic Nanoparticles Based on Ferrite Promoted by a Three-Step Thermal Decomposition Process
Sartori, Kevin,Choueikani, Fadi,Gloter, Alexandre,Begin-Colin, Sylvie,Taverna, Dario,Pichon, Benoit P.
supporting information, p. 9783 - 9787 (2019/07/04)
Exchange coupled nanoparticles that combine hard and soft magnetic phases are very promising to enhance the effective magnetic anisotropy while preserving sizes below 20 nm. However, the core-shell structure is usually insufficient to produce rare earth-free ferro(i)magnetic blocked nanoparticles at room temperature. We report on onion-type magnetic nanoparticles prepared by a three-step seed mediated growth based on the thermal decomposition method. The core@shell@shell structure consists of a core and an external shell of Fe3-?O4 separated by an intermediate Co-doped ferrite shell. The double exchange coupling at both core@shell and shell@shell interfaces results in such an increased of the magnetic anisotropy energy, that onion-type nanoparticles of 16 nm mainly based on iron oxide are blocked at room temperature. We envision that these results are very appealing for potential applications based on permanent magnets.
