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Willinger, Marc-Georg,Neri, Giovanni,Bonavita, Anna,Micali, Giuseppe,Rauwel, Erwan,Herntrich, Tobias,Pinna, Nicola Royal Society of Chemistry 2009 Physical chemistry chemical physics Vol.11 No.19
<P>A new atomic layer deposition (ALD) process was applied for the uniform coating of carbon nanotubes with a number of transition-metal oxide thin films (vanadium, titanium, and hafnium oxide). The presented approach is adapted from non-aqueous sol–gel chemistry and utilizes metal alkoxides and carboxylic acids as precursors. It allows the coating of the inner and outer surface of the tubes with a highly conformal film of controllable thickness and hence, the production of high surface area hybrid materials. The morphology and the chemical composition as well as the high purity of the films are evidenced through a combination of electron microscopic and electron-energy-loss spectrometric techniques. Furthermore, in order to highlight a possible application of the obtained hybrids, the electrical and sensing properties of resistive gas sensors based on hybrid vanadium oxide-coated carbon nanotubes (V<SUB>2</SUB>O<SUB>4</SUB>–CNTs) are reported and the effect of thermal treatment on the gas sensing properties is studied.</P> <P>Graphic Abstract</P><P>The controlled deposition of high quality thin metal oxide films onto the surface of CNTs is achieved through a new approach to ALD. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b821555c'> </P>
Katrin Willinger,Godoberto Guevara-Rojas,Julia Cede,Kurt Schicho,Tanja Stamm,Clemens Klug 대한악안면성형재건외과학회 2021 Maxillofacial Plastic Reconstructive Surgery Vol.43 No.-
BackgroundToday virtual surgical planning (VSP) is a standard method in maxillofacial corrective surgery and is the key to reach satisfactory esthetic outcomes. The purpose of this study was to evaluate usability of three established virtual surgical planning software applications by comparing feasibility, time consumption, and costs in a standardized workflow for a modified intraoral quadrangular Le Fort II osteotomy (IQLFIIO). ResultsA cross-sectional study was performed based on retrospective and re-planned data of patients with midfacial deficiency treated by modified IQLFIIO, using three software applications: IPS Case Designer ®, Dolphin Imaging ®, and ProPlan CMF ®. Feasibility: All evaluated steps of the VSP procedure could be successfully performed in all three evaluated applications. In all software packages, it was possible to design the surgical splints with CAD/CAM technology. Working time: The mean value of time needed was IPS Case Designer ®, 36.5 min; Dolphin Imaging ®, 33.6 min; ProPlan CMF ®, 45.5 min. We found statistical significant difference between ProPlan CMF ® and Dolphin Imaging ® (p value, 0.02). Costs: Asset costs for acquiring the software, license fee, license possibilities, paying for support services, and service contracts were evaluated and are found in similar ranges. ConclusionAll three tested software applications are usable for virtual planning of an IQLFIIO and splint production by CAD/CAM technology. Successful movement of bone segments and overlaying soft tissues proved feasibility. Time consumption and costs were found in similar ranges.
A general soft-chemistry route to metal phosphate nanocrystals
Marc-Georg Willinger,Guylhaine Clavel,Weihua Di,니콜라피나 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.6
The ‘‘benzyl alcohol route’’ was extended for the synthesis of various metal phosphate nanocrystals. The proposed one pot reaction leads to nanocrystalline titanium, zirconium, vanadium, yttrium and lanthanide phosphates at a yield above 90%. The synthesized particles are characterized by a high crystallinity and a small size distribution.
One-Step Synthesis and Self-Assembly of Metal Oxide Nanoparticles into 3D Superlattices
Pucci, Andrea,Willinger, Marc-Georg,Liu, Feng,Zeng, Xiangbing,Rebuttini, Valentina,Clavel, Guylhaine,Bai, Xue,Ungar, Goran,Pinna, Nicola American Chemical Society 2012 ACS NANO Vol.6 No.5
<P>A simple one-pot approach based on the “benzyl alcohol route” is introduced for the fabrication of highly ordered supercrystals composed of highly uniform 3–4 nm zirconia and rare-earth stabilized zirconia nanoparticles. The as-fabricated supercrystals reach sizes larger than 10 μm and present well-defined 3D morphologies such as flower-like, rhombic dodecahedron, and bipyramids. This system is unique in that the supercrystals are formed in one-step directly in the reaction medium where the nanoparticles are synthesized. The uniformity in nanocrystal shape and size is attributed to the <I>in situ</I> formation of benzoate species that directs the nanoparticle growth and assembly. The low colloidal stabilization of the benzoate-capped nanoparticles in benzyl alcohol promotes the formation of supercrystals in solution by π–π interaction between the <I>in situ</I> formed benzoate ligands attached to neighboring particles. By varying the reaction temperature and the nature of the doping the way the nanobulding blocks assemble in the supercrystals could be controlled. Standard FCC superlattice packings were found together with more unusual ones with <I>P</I>6<I>/mmm</I> and <I>R</I>3̅<I>m</I> symmetries.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-5/nn3010735/production/images/medium/nn-2012-010735_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn3010735'>ACS Electronic Supporting Info</A></P>
Marichy, Catherine,Donato, Nicola,Willinger, Marc‐,Georg,Latino, Mariangela,Karpinsky, Dmitry,Yu, Seung‐,Ho,Neri, Giovanni,Pinna, Nicola WILEY‐VCH Verlag 2011 Advanced functional materials Vol.21 No.4
<P><B>Abstract</B></P><P>A new atomic layer deposition (ALD) process for nanocrystalline tin dioxide films is developed and applied for the coating of nanostructured materials. This approach, which is adapted from non‐hydrolytic sol‐gel chemistry, permits the deposition of SnO<SUB>2</SUB> at temperatures as low as 75 °C. It allows the coating of the inner and outer surface of multiwalled carbon nanotubes with a highly conformal film of controllable thickness. The ALD‐coated tubes are investigated as active components in gas‐sensor devices. Due to the formation of a p‐n heterojunction between the highly conductive support and the SnO<SUB>2</SUB> thin film an enhancement of the gas sensing response is observed.</P>
Santangelo, S.,Messina, G.,Faggio, G.,Willinger, M.G.,Pinna, N.,Donato, A.,Arena, A.,Donato, N.,Neri, G. Elsevier 2010 Diamond and related materials Vol.19 No.5
Commercial tubular carbon nanofibers were uniformly coated with a 5nm thick vanadium oxide layer via a modified approach to atomic layer deposition. The composition and microstructure of the resulting hybrid material was analyzed by micro-Raman spectroscopy. The effect of the post-synthesis thermal treatment in air at temperatures in the range of 25-375<SUP>o</SUP>C was investigated in order to more deeply understand the behavior of the hybrid material in gas sensing devices. The obtained results demonstrate that the thermal treatment primarily affects the oxide coating-layer that is responsible for the sensing properties. The best sensor performance was obtained at the temperature at which the oxide layered-structure exhibits the highest structural order.