Investigation into La(Fe/Mn)O Perovskites Formation over Time during Molten Salt Synthesis.

Molten salt synthesis (MSS) of complex oxides is generally investigated by characterization of the product phases with no insight into evolution of particle morphology. In this work, LaFeO and LaMnO MSS was investigated in KF-KCl and LiCl-KCl at 850 °C using a "feeding-and-sampling" procedure. By feeding the oxide reagents into a molten salt, the reaction starting point was clearly defined, while subsequent sampling of the melt provided means for tracking the phase composition along with the shape and size of product particles during MSS.

Core-Shell FeO@LaSrFeO Material for Catalytic Oxidations: Coverage of Iron Oxide Core, Oxygen Storage Capacity and Reactivity of Surface Oxygens.

A series of FeO@LSF (LaSrFeO perovskite) core-shell materials (CSM) was prepared by infiltration of LSF precursors gel containing various complexants and their mixtures to nanocrystalline aggregates of hematite followed by thermal treatment. The content of LSF phase and amount of carboxyl groups in complexant determine the percent coverage of iron oxide core with the LSF shell. The most conformal coating core-shell material was prepared with citric acid as the complexant, contained 60 wt% LSF with 98% core coverage.

Electrospun nanofibers with surface oriented lamellar patterns and their potential applications.

This work shows conclusively that lamellar surface patterns can be obtained with diverse ceramic compositions during electrospinning. The lamellar structure formation is governed by the creation of an outer shell during the thermal treatment of initially uniform cylindrical fibers, consisting of polymer and pre-ceramic compounds. By changing the polymer to pre-ceramic ratio in the electrospinning solution, we demonstrate for the first time a facile way to control the obtained surface structure and the orientation of the lamellas.

Electrospun Fe-Al-O Nanobelts for Selective CO Hydrogenation to Light Olefins.

Ceramic nanobelt catalysts consisting of Fe-Al-O spinel modified with potassium were synthesized for CO hydrogenation into hydrocarbons. Nanobelts and hollow nanofibers were produced utilizing the internal heat released by oxidation of the organic component within the fibers. This extremely fast and short heating facilitated crystallization of the desired phase, while maintaining small grains and a large surface area.

Ruptured Ovarian Artery Pseudoaneurysm in a Postmenopausal Patient Treated with Transcatheter Embolization.

Ovarian artery pseudoaneurysms are relatively rare entities, usually associated with pregnancy or the early postpregnancy period. Occurrence in older females is even less common. We present a case of ruptured ovarian artery pseudoaneurysm in an older postmenopausal patient, successfully treated with transcatheter embolization.

Importance of Both Internal and External Iliac Artery Interrogation in Pelvic Trauma as Evidenced by Hemorrhage from Bilateral Corona Mortis with Unilateral Aberrant Origin off the External Iliac Artery.

Transcatheter angiography and embolization has long been recognized as the gold standard for patients with hemodynamic instability secondary to blunt pelvic trauma. While often the bleeding source can be readily localized based on the distribution of extravasation on preprocedural Computed Tomographic Angiography, one should be cautious in assessment for aberrant anatomy. A variant obturator artery originating from the inferior epigastric branch of the external iliac artery is commonly referred to as the corona mortis.

Massive Hematemesis from a Splenic Artery Pseudoaneurysm Presenting Two Years after Penetrating Trauma.

Splenic artery pseudoaneurysms (PSA) are rare entities and far less common than true aneurysms of the splenic artery. The most common etiology is pancreatitis, recurrent either in the setting of chronic pancreatitis or as an episode of acute pancreatitis. Less common causes include trauma, peptic ulcer disease, or iatrogenic causes.

Chronic Dialysis Dependent Renal Failure Resulting from a Massive Bladder Containing Inguinal Hernia.

Bladder involvement in inguinal hernia is relatively rare, 1-4%, although the incidence is increased to 10% with advancing age or obesity. There are several previously reported cases presenting with obstructive uropathy and renal failure, but all reversed with urinary diversion and hernia repair. We believe this to be the first reported case of bladder hernia leading to dialysis dependent chronic renal failure.

Novel bifunctional catalysts based on crystalline multi-oxide matrices containing iron ions for CO2 hydrogenation to liquid fuels and chemicals.

Seven solid mono-, bi- and tri-metallic oxide matrices where Fe(2+,3+) ions are distributed in different chemical/spatial environments were synthesized and characterized by XRD, N2-adsorption and EDAX methods. After basification with potassium, all matrices were activated by carburization or reduction-carburization under conditions selected based on the TPC/TPR spectra, tailoring the carburization extent of iron. The performances of the activated Fe-based catalysts with respect to CO2 conversion and C5+ selectivity were measured in a fixed-bed reactor under standard conditions in transient and continuous operation modes in units containing one or three reactors in series with water separations between the reactors.

Novel process and catalytic materials for converting CO2 and H2 containing mixtures to liquid fuels and chemicals.

Carbon dioxide and water are renewable and the most abundant feedstocks for the production of chemicals and fungible fuels. However, the current technologies for production of hydrogen from water are not competitive. Therefore, reacting carbon dioxide with hydrogen is not economically viable in the near future.

Sustainable production of green feed from carbon dioxide and hydrogen.

Carbon dioxide hydrogenation to form hydrocarbons was conducted on two iron-based catalysts, prepared according to procedures described in the literature, and on a new iron spinel catalyst. The CO2 conversion measured in a packed-bed reactor was limited to about 60% because of excessive amounts of water produced in this process. Switching to a system of three packed-bed reactors in series with interim removal of water and condensed hydrocarbons increased CO2 conversion to as much as 89%.

Grain boundaries at the surface of consolidated MgO nanocrystals and acid-base functionality.

The increase of the surface basicity-acidity of MgO material by factors of 1.8-3.0 due to consolidation of its nanocrystals was demonstrated by the indicator titration.

Synthesis of LaMnO3 in molten chlorides: effect of preparation conditions.

LaMnO3 perovskite was successfully synthesized in molten chlorides. In order to explore the effect of the molten salt type, NaCl-KCl and LiCl-KCl eutectic mixtures were employed as a liquid medium for the perovskite formation process. The synthesis included heating the La-nitrate, Mn-nitrate and chlorides mixture to above the melting point of the corresponding chlorides.

Direct sonographic-guided superior gluteal artery access for treatment of a previously treated expanding internal iliac artery aneurysm.

Isolated internal iliac artery aneurysms are relatively uncommon compared with all aortoiliac aneurysms. Transcatheter treatment with coil embolization is an attractive noninvasive alternative to surgical resection. However, if the aneurysm is insufficiently treated with only proximal coil embolization without concurrent embolization of distal runoff vessels, there is a risk of aneurysm expansion from retrograde collateral flow.

Catalytic wet air oxidation of aniline with nanocasted Mn-Ce-oxide catalyst.

The catalytic wet air oxidation of aqueous solution containing 1000 ppm aniline was conducted in a trickle-bed reactor packed with a novel nanocasted Mn-Ce-oxide catalyst (surface area of 300 m2/g) prepared using SBA-15 silica as a hard template. A range of liquid hourly space velocities (5-20 h(-1)) and temperatures (110-140 degrees C) at 10 bar of oxygen were tested. The experiments were conducted to provide the intrinsic performance of the catalysts.

Combustion of chlorinated VOC on nanostructured chromia aerogel as catalyst and catalyst support.

The chromia-based catalysts have been reported to combine the high activity and resistance to deactivation in oxidative removal of chlorinated VOC. However, their activity is limited by the low amount of chromia that can be deposited on supports maintaining the optimal state of surface species and high surface area. The pure nanostructured chromia was used as a catalytically active support for noble metals and transition-metal oxide oxidation catalysts.

Cocaine-induced mesenteric ischemia: treatment with intra-arterial papaverine.

Mesenteric vascular ischemia is a known complication of cocaine use. Although the majority of cases of cocaine-induced mesenteric ischemia present with ischemic colitis and rectal bleeding, several cases have been described presenting only with abdominal pain. We present a case of mesenteric vasoconstriction with angiographic documentation and treatment.

A novel system consisting of Rh-DuPHOS and ionic liquid for asymmetric hydrogenations.

The ionic liquid [bmim][PF6] was found to provide extra stability to the air-sensitive chiral catalyst Rh-MeDuPHOS in asymmetric hydrogenation of enamides.

Aqueous enantioselective hydrogenation of methyl 2-acetamidoacrylate with Rh-MeDuPHOS occluded in PDMS.

A new chiral heterogeneous catalytic system obtained by occlusion of the Rh-MeDuPHOS complex in a polydimethylsiloxane film was tested in the asymmetric hydrogenation of methyl 2-acetamidoacrylate in aqueous medium.

Using sonochemical methods for the preparation of mesoporous materials and for the deposition of catalysts into the mesopores.

Ultrasound radiation can be used to synthesize a variety of mesporous materials. The reaction time is considerably shorter than the conventional methods. Ultrasonic waves can be further used for the insertion of amorphous nanosized catalysts into the mesopores.

Attenuation of ultrasound in porous media with dispersed microbubbles.

The dispersion relation for a granular bed with a small amount of fine bubbles is formulated and analyzed. It is assumed that the grain size is much larger than the bubble's radius and that their volume concentration is small. The study is motivated by the problem of acoustic diagnostics of fixed bed chemical reactors operating in multiphase flow regime.