555-36-2Relevant academic research and scientific papers
Liquid-like interfacial correlation in LB films
Sanyal,Basu,Datta
, p. 217 - 222 (1998)
We present here results of X-ray reflectivity and diffuse scattering study of three Langmuir-Blodgett films, all having nine monolayers. These systems are the cadmium arachidate film grown using the conventional method, the arachidic acid film with trapped CdS layers at the interfaces formed by exposing the cadmium arachidate film to hydrogen sulphide and ferric stearate film grown from a monolayer of the pre-formed salt on water. Self-consistent analysis of all the scattering data measured, viz., in specular, in transverse and in longitudinal directions, for each film shows that the interfaces are conformal in nature and the logarithmic in-plane correlation, characteristic of capillary waves on liquid surfaces, exists in all the three films.
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.
Facile Gram-Scale Synthesis of the First n-Type CuFeS2 Nanocrystals for Thermoelectric Applications
Gabka, Grzegorz,Zyba?a, Rafa?,Bujak, Piotr,Ostrowski, Andrzej,Chmielewski, Marcin,Lisowski, Wojciech,Sobczak, Janusz W.,Pron, Adam
supporting information, p. 3150 - 3153 (2017/07/22)
The described method enables facile gram-scale preparation of CuFeS2 nanocrystals exhibiting interesting thermoelectric properties from simple and readily available precursors. Exchange of primary organic ligands for inorganic ones using either (NH4)2S or triethyloxonium tetrafuoroborate (Meerwein's salt) resulted in nanocrystals from which n-type bulk thermoelectric materials were obtained through sintering under pressure. The measured physical properties of the fabricated bulk thermoelectric materials depend on the type of inorganic ligands used for the exchange. In particular, materials that were surface-modified with Meerwein's salt have a higher Seebeck coefficient (|S| = 238 μV K–1) as compared to those modified with (NH4)2S, whereas the latter exhibit higher electrical conductivity (8500 S m–1) and lower thermal conductivity (0.5 W m–1 K–1), both of which are favorable for thermoelectric applications.
Iron soap, method for producing the same and thermoplastic resin composition containing the same
-
Paragraph 0100-0103; 0105-0107, (2017/12/15)
Provided is an iron soap characterized in that: the free fatty acid content A (%) is 0.01 ≤ A ≤ 8.0; the water-soluble salt content B (%) is 0.01 ≤ B ≤ 0.5; the grain size summary value C represented by formula (1) is 0.1 ≤ C ≤ 5.0; and the iron soap is a salt of a C12-22 straight-chain saturated fatty acid and iron. Grain size summary value C=(D90-D10)/D50 (provided that 1.0 ≤ D50 ≤ 40.0) (1). In formula (1), D10: 10% cumulative diameter ([mu]m) based on the volume of the fatty acid metal salt particles, D50: 50% cumulative diameter ([mu]m) based on the volume of the fatty acid metal salt particles, and D90: 90% cumulative diameter ([mu]m) based on the volume of the fatty acid metal salt particles.
Cu-Fe-S Nanocrystals Exhibiting Tunable Localized Surface Plasmon Resonance in the Visible to NIR Spectral Ranges
Gabka, Grzegorz,Bujak, Piotr,Ostrowski, Andrzej,Tomaszewski, Waldemar,Lisowski, Wojciech,Sobczak, Janusz W.,Pron, Adam
supporting information, p. 6660 - 6669 (2016/07/19)
Cu-Fe-S nanocrystals exhibiting a strong localized surface plasmon resonance (LSPR) effect were synthesized for the first time. The elaborated reproducible preparation procedure involved copper(II) oleate, iron(III) stearate, and sulfur powder dissolved in oleylamine (OLA) as precursors. The wavelength of the plasmonic resonance maximum could be tuned by changing the Cu/Fe ratio in the resulting nanocrystals, being the most energetic for the 1:1 ratio (486 nm) and undergoing a bathochromic shift to ca. 1200 nm with an increase to 6:1. LSPR could also be observed in nanocrystals prepared from the same metal precursors and sulfur powder dissolved in 1-octadecene (ODE), provided that the sulfur precursor was taken in excess. Detailed analysis of the reaction mixture by chromatographic techniques, supplemented by mass spectrometry and 1H NMR spectroscopy enabled the identification of the true chemical nature of the sulfur precursor in S/OLA, namely, (C18H35NH3+)(C18H35NH-S8-), a reactive product of the reduction of elemental sulfur by the amine groups of OLA. In the case of the S/ODE precursor, the true precursors are much less reactive primary or secondary thioethers and dialkyl polysulfides.
Colloidal synthesis of ultrathin γ-Fe2O3 nanoplates
Ding, Xiangui,Bao, Liu,Jiang, Jiang,Gu, Hongwei
, p. 9314 - 9320 (2014/03/21)
A facile method of synthesizing γ-Fe2O3 ultrathin nanoplates has been developed. These nanoplates are single crystalline and superparamagnetic at room temperature, with a thickness of only 1.4 nm. FTIR analysis has shown that the coordination mode between Fe and carboxyl group is dominated by bidentate configuration in the as prepared iron oleate complex, which is the key for producing the nanoplate morphology. By changing the reaction temperatures, the lateral size and thickness of nanoplates can be varied.
Wet-chemical catalyst deposition for scalable synthesis of vertical aligned carbon nanotubes on metal substrates
Doerfler,Meier,Thieme,Nemeth,Althues,Kaskel
, p. 288 - 293 (2011/10/06)
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.
Catalytic oxidative cleavage of terminal olefins by chromium(III) stearate
Jarupinthusophon, Suekanya,Thong-In, Uthumporn,Chavasiri, Warinthorn
, p. 289 - 294 (2008/10/09)
A new synthetic methodology for the preparation of carbonyl compounds from the oxidative cleavage of terminal olefins has been developed. With the use of TBHP in combination with chromium(III) stearate, selective oxidation of double bonds conjugated with aromatic ring or carbonyl group could be achieved at ambient temperature in moderate to excellent yield. The oxidative cleavage of electron rich α-methylstyrene derivatives proceeded in good to excellent yield whereas lower yields were observed in α-methylstyrene derivatives containing an electron withdrawing group. This developed oxidation reaction was believed to undergo via free radical process and high valent chromium oxo species.
