Synthesis and Photoluminescence of Single-Crystalline Fe(III)-Doped CdS Nanobelts.

In this paper, we report the synthesis and optical properties of Fe(III) doped CdS nanobelts (NBs) via simple Chemical Vapor Deposition (CVD) technique to explore their potential in nano-optics. The energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analysis manifested the presence of Fe(III) ions in the NBs subsequently confirmed by the peak shifting to lower phonon energies as recorded by Raman spectra and shorter lifetime in ns. Photoluminescence (PL) spectrum investigations of the single Fe(III)-doped CdS NBs depicted an additional PL peak centered at 573 nm (orange emission) in addition to the bandedge(BE) emission.

Synthesis of Nanocrystalline SnO2 Microspheres and Their Hydrogen Absorption Characteristics.

SnO2 solid microspheres and multilayered nanocrystalline SnO2 hollow microspheres (MHS-SnO2) have been successfully synthesized in the solvothermal environment by using different solvents. The morphology, structure and composition of the as-prepared products are characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) with selected area electron diffraction (SAED) and X-ray diffraction (XRD). The growth mechanism of SnO2 solid microspheres and MHS-SnO2 are proposed and attributed to the viscosity of solvent.

The impact of a minimally invasive approach on reoperative aortic valve replacement.

Background And Aim Of The Study: The advantages of minimally invasive aortic valve replacement (AVR) are well documented, but whether the benefits extend to subsequent reoperative aortic valve surgery and beyond is unknown. The study aim was to compare in-hospital outcomes and long-term survival following reoperative AVR between patients who had previous undergone either minimally invasive AVR (mini-AVR) or full sternotomy AVR (sAVR).

Methods: All reoperative, isolated AVRs performed between July 1997 and September 2013 at the authors' institution, with or without non-complex aortic surgery, were identified.

Surgical Embolectomy for Acute Massive and Submassive Pulmonary Embolism in a Series of 115 Patients.

Background: Pulmonary embolectomy is often indicated for central pulmonary embolism (PE) with hemodynamic instability, but remains controversial for hemodynamically stable patients with signs of right ventricular dysfunction. Because thrombolytic therapy is often contraindicated postoperatively, we reviewed risk factors and outcomes of pulmonary embolectomy for stable and unstable central PE, particularly in the early postoperative period.

Methods: Between October 1999 and September 2013, 115 patients underwent pulmonary embolectomy for central, hemodynamically unstable PE (49 of 115, 43%) or hemodynamically stable PE (56 of 115, 49%).

The safety of deep hypothermic circulatory arrest in aortic valve replacement with unclampable aorta in non-octogenarians.

Objectives: Aortic valve replacement (AVR) in patients with severely atherosclerotic aortas (porcelain aorta) presents a significant technical challenge. Two strategies are deep hypothermic circulatory arrest (DHCA) during conventional surgery and transcatheter aortic valve replacement (TAVR). The aim of this study was to examine the outcomes in patients who underwent DHCA for AVR with a porcelain aorta to identify whether older patients are more suitable for TAVR.

Mechanical versus bioprosthetic mitral valve replacement in patients <65 years old.

Objective: Because of its durability, the mechanical valve is typically chosen for young patients undergoing mitral valve replacement (MVR). However, a bioprosthetic valve might have the benefit of valve-in-valve transcatheter valve replacement when valve failure occurs. We examined the outcomes in patients who had undergone mechanical valve MVR (MVRm) versus bioprosthetic valve MVR (MVRb) in patients aged <65 years.

Influence of SiO2 on the structure-controlled synthesis and magnetic properties of prismatic MnO2 nanorods.

Silicon dioxide-doped tetragonal MnO2 single crystalline prismatic nanorods have been successfully synthesized through a facile hydrothermal route at a temperature of 250 ° C with a reaction time as quick as 5 h. The synthesized MnO2 prismatic nanorods were characterized by x-ray diffraction, field emission scanning electron microscopy, energy dispersive x-ray analysis, transmission electron microscopy, high resolution transmission electron microscopy with selected area electron diffraction and Raman spectroscopy. Experimental results show that single crystalline tetragonal MnO2 nanorods have been successfully synthesized at all doping concentrations and that nanorods with a prismatic surface morphology have been obtained at 20 mass% of SiO2.

Synthesis, characterization and optical property of shrimps-like nanostructures of MnO2 by hydrothermal route.

Hexagonal MnO2 shrimps like nanostructures have been successfully synthesized through a facile hydrothermal route at a temperature of 175 degrees C. The synthesized MnO2 nanostructures were characterized by the X-Ray Diffraction, Scanning Electron Microscopy, Energy Dispersive X-Ray spectroscopy, Transmission Electron Microscopy, High Resolution Transmission Electron Microscopy, Selected Area Electron Diffraction and UV-visible spectroscopy. UV-vis spectrophotometer was used to determine the absorption behaviour of shrimps like nanostructures.

Preparation, characterizations and optical property of single crystalline ZnMn2O4 nanoflowers via template-free hydrothermal synthesis.

In this work, we have reported a template-free hydrothermal approach to fabricate highly pure single phase ZnMn2O4 pen-type nano needles assembled with flower type nanostructures. The X-Ray Diffraction, Scanning Electron Microscopy, Energy Dispersive X-Ray spectroscopy, Raman Spectroscopy, Transmission Electron Microscopy, High Resolution Transmission Electron Microscopy, Selected Area Electron Diffraction and UV-visible spectroscopy techniques were used to study the structural and optical properties of Pen-type nanoneedles assembled with flower like nanostrucutres. Single crystalline hetaerolite ZnMn2O4 pen type nanoneedles of flower like nanostructures have an average diameter of 250 nm.

Effect of atomic percentage of Zn on the size and optical properties of porous ZnMn2O4 nanoparticles.

The porous ZnMn2O4 nanostructures have been synthesized by hydrothermal method by using Mn3O4 and Zn powder as precursors. The morphology of the nanoparticles could be tuned by changing the molar ratio of Zn in the reaction system. The final products have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, UV-visible spectroscopy and the florescence spectrometer.

Controlled synthesis, characterizations and structural-properties of micro-flowers, pine-cone, core-shell and liver-like micro-architecture of crystalline ZnMn2O4.

The conspicuous ZnMn2O4 micro-structures have been synthesized by hydrothermal method by using Mn3O4 and Zn powder as precursors. The micro-structures of the ZnMn2O4 could be tuned by changing the reaction time only in the reaction system. The final products have been characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis and the Raman spectroscopy.