نتایج جستجو برای: ultra high vacuum

تعداد نتایج: 2129163  

2018
Waqar Khan Fasihullah Khan Hafiz Muhammad Salman Ajmal Noor Ul Huda Ji Hyun Kim Sam-Dong Kim

In this study, the ambient condition for the as-coated seed layer (SL) annealing at 350 °C is varied from air or nitrogen to vacuum to examine the evolution of structural and optical properties of ZnO nanorods (NRs). The NR crystals of high surface density (~240 rods/μm²) and aspect ratio (~20.3) show greatly enhanced (002) degree of orientation and crystalline quality, when grown on the SLs an...

Journal: :Journal of the Japan Institute of Metals and Materials 1985

2008
Dongxing Yang Aruna Velamakanni Gülay Bozoklu Sungjin Park Meryl Stoller Richard D. Piner Sasha Stankovich Inhwa Jung Daniel A. Field Carl A. Ventrice Rodney S. Ruoff

Several nanometer-thick graphene oxide films deposited on silicon nitride-on silicon substrates were exposed to nine different heat treatments (three in Argon, three in Argon and Hydrogen, and three in ultra-high vacuum), and also a film was held at 70 C while being exposed to a vapor from hydrazine monohydrate. The films were characterized with atomic force microscopy to obtain local thickness...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2006
Seong H Kim Gabor A Somorjai

This article reviews the surface science of the heterogeneous olefin polymerization catalysts. The specific focus is on how to prepare and characterize stereochemically specific heterogeneous model catalysts for the Ziegler-Natta polymerization. Under clean, ultra-high vacuum conditions, low-energy electron irradiation during the chemical vapor deposition of model Ziegler-Natta catalysts can be...

Journal: :AIP Advances 2022

Clean loading of silica nanoparticles with a radius as small [Formula: see text] nm is required for experiments in levitated optomechanics that operate ultra-high vacuum. We present cheap and simple experimental method dry launching by shaking from polytetrafluoroethylene surface (PTFE). report on the successful single minimum 43 nm, which enabled low stiction to surface. Nanoparticles radii 71...

Scanning Hall Probe Microscopy (SHPM) is a scanning probe microscopy technique developed to observe and image magnetic fields locally. This method is based on application of the Hall Effect, supplied by a micro hall probe attached to the end of cantilever as a sensor.  SHPM provides direct quantitative information on the magnetic state of a material and can also image magnetic induction under a...

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