نتایج جستجو برای: silicon dioxide nanoparticle

تعداد نتایج: 188643  

Journal: :Optics express 2011
Goran Z Mashanovich Milan M Milošević Milos Nedeljkovic Nathan Owens Boqian Xiong Ee Jin Teo Youfang Hu

Silicon-on-insulator (SOI) has been used as a platform for near-infrared photonic devices for more than twenty years. Longer wavelengths, however, may be problematic for SOI due to higher absorption loss in silicon dioxide. In this paper we report propagation loss measurements for the longest wavelength used so far on SOI platform. We show that propagation losses of 0.6-0.7 dB/cm can be achieve...

2004
J. A. Voorthuyzen P. Bergveld

The operation of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is based on the fact that the lateral conductivity of silicon at the silicon dioxide-silicon interface strongly depends on the transverse electric field in the oxide. Adding a small air-filled spacer between metal gate and oxide, and applying a voltage across the insulator on top of the silicon, the lateral conducti...

Journal: :Journal of Research of the National Bureau of Standards 1958

1999
N. R. Rueger G. S. Oehrlein

Selective etching of SiO2 over polycrystalline silicon has been studied using CHF3 in an inductively coupled plasma reactor ~ICP!. Inductive powers between 200 and 1400 W, as well as pressures of 6, 10, and 20 mTorr were used in this study of the etch rate and selectivity behaviors for silicon dioxide, silicon, and passively deposited fluorocarbon films. Using in situ ellipsometry, the etch rat...

2013
Charles T. Price Kenneth J. Koval Joshua R. Langford

Physicians are aware of the benefits of calcium and vitamin D supplementation. However, additional nutritional components may also be important for bone health. There is a growing body of the scientific literature which recognizes that silicon plays an essential role in bone formation and maintenance. Silicon improves bone matrix quality and facilitates bone mineralization. Increased intake of ...

2018
Megha Trivedi Jenny Murase

Titanium dioxide has been used in various industrial and cosmetic applications due to its unique elemental properties. This substance has a refractive index higher than most other compounds (n = 2.6142, in comparison to water at 20°C n = 1.33). This allows titanium dioxide to have an iridescent and bright quality. It has been used in the cosmetics industry for “whitening” and “thickening” in mu...

Abolfazl Akbarzad Alireza Farajollahi, Alireza Naseri Behnam Nasiri motlagh Effat Alizadeh Ghazal Darfarin Roya Salehi

  Introduction: In the present study, we investigated the role of gold-silica shell-core nanoparticle in megavoltage irradiation of MCF7 breast cancer cells.   Materials and Methods: gold-silicon oxide shell-core nanoparticles (NPs) were obtained by conjugation of gold nanoparticle with amine or thiol functionalized silica nanoparticles (AuN@SiO2 and AuS@SiO...

2011
Sanjeeva Witharana Haisheng Chen Yulong Ding

An experimental study was conducted to investigate the structural stability of ethylene glycol-based titanium dioxide nanoparticle suspensions (nanofluids) prepared by two-step method. The effects of particle concentration, fluid temperature, shear rate and shear duration were examined. Particle size and thermal conductivity measurements in quiescent state indicated the existence of aggregates ...

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