The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Fluorescence emission of a quantum emitter is dominated by its optical environment, and it was proven that an emitter is quenched when it is placed too closed to metal nanoparticles. Here, we present the spatio-temporal dynamics of the emitter and demonstrate that quenching can in fact be suppressed in plasmonic nanocavities. By varying the lateral position of an emitter through DNA-origami technique,...
Nanofluids have been identified to be one of the suitable approaches to increase the breakdown strength of transformer oil. However, the nanofluids tend to form sediment which nullifies its full capabilities in increasing the electrical properties such as higher AC breakdown strength. In view of foregoing, this paper presents an approach to enhance the AC breakdown strength of the transformer oil...
Electromagnetic modeling of sensing of stochastic distributions of nanometer-sized particles usually requires a large number of calculations to correctly obtain the average response of a sensor. Here, we present an alternative method, which utilizes a gradient effective permittivity model based on the classical Maxwell-Garnett mixing formula. In our model the nanoparticle layer is homogenized into...
In this contribution, we put forward an analytical model for the design of lossless and lossy nanoparticle-based metasurfaces working at a desired frequency in the optical spectrum. To show the versatility of our approach, we exploit it for the design of different innovative devices, such as cloaking-inspired anti-reflection coatings, circuit-analog screens and narrowband optical absorbers that are...
Copper and its oxides nanoparticles have been widely studied because of their reasonable electrical and optical properties. Here, copper nanopatticles (Cu) were synthesized and oxidized at various temperature for one hour. The obtained copper oxides (CuxO, x=1 or 2) were well characterized by DSC/TGA, XRD and SEM techniques. The dielectric properties of the epoxy composites filled with Cu and CuxO...
PEEK (poly-ether-ether-ketone) is a semi crystalline thermoplastic with excellent mechanical and chemical resistance properties. In this work the influence of TiO2 nanoparticle at various concentration (0.5, 1 and 1.5 wt. %) on tribological and mechanical properties of PEEK were investigated. The mechanical properties of PEEK Nano composites were studying to evaluate the influence of the nanoparticles...
Efficient light management is critical for the enhancement of the efficiency of solar cells. The performance of a solar cell is determined by the efficiency of the absorption process of light via excitation of electron-hole pairs and extraction of these generated charge carriers. The absorption, in turn, has a few limiting factors: one is related to the small size and acceptance angle of the active...
An array of conical-shaped p-type silicon tips was fabricated by using reactive ion etching and sharpening oxidation. The apex of each tip was decorated by a tungsten hemispherical nanoparticle. Field emission properties of the tips were measured by a tungsten-needle anode positioned above the tip apex. Tips decorated with tungsten nanoparticles demonstrated a smaller saturation region in current-voltage...
Raman spectroscopy, which can provide valuable information about chemical structure, is widely used as an analytical tool for material identification and quantitative chemical/biological analysis. Surface-enhanced Raman spectroscopy (SERS), overcoming the traditional limitation of weak signals, improves the signal intensity significantly. The preprocessing of Raman spectrum is a very useful way to...
In this paper, we propose a novel coil for highly focused magnetic hyperthermia with nanoparticles, suitable for superficial treatments. The design has been carried out by using a commercial electromagnetic simulation software based on the Method of Moments (MoM).
Brownian motion had been a topic of interest since the last two centuries and researchers have investigated the motion considering size, environment and mass. Few attempts considering the non-rigidity had been published to establish correlation between variance and nanoparticle parameter like size, mass and non-rigidity (stiffness) [1] [2]. In continuation, the present work investigates the significance...
Nanoparticles of several different compositions and lattice structures that have been characterized by transmission electron microscopy, scanning/transmission electron microscopy, X-ray spectroscopic (EDX) analysis, and diffraction patterns may be conjugated to biological targeting agents for use as labels that can localize and differentiate multiple targets at nanometer resolution in complex biological...
The characteristics of nano-acoustic resonators are analyzed to assess their use in sensing the acoustic properties of the near-particle environment of nanoparticles embedded in various matrices. This type of information is critical to understanding the chemo-physical interactions between these matrices and particles in polymer matrix nanocomposites designed to provide specific optical and chemical...
Tea is very popular in the world owing to its numerous therapeutic effects in lowering blood pressure, decreasing blood coagulation, repairing oxidative damage among many others. Due to their promising biodegradability, biocompatibility and antimicrobial activity, tea nanoparticles isolated from tea leaves have a great potential for various biomedical applications. Small molecules like polyphenols...
Neurodegenerative diseases are the current centre of attention in medicine due to their increased physiological and psychological burden on the ageing society and in the other hand the lack of efficient treatment to them. In parallel, nanotechnology opens possibilities to study neurodegeneration in the molecular level and uncover cellular properties at the nanoscale that possibly allow disease control...
How to improve the selectivity and efficacy of anticancer agents and to reduce side effects has always been a big challenge in clinical cancer therapy. Chemotherapeutic agents are usually toxic to both cancer and normal tissues, thus rendering compromised overall clinical outcome. Here we developed zero-valent iron nanoparticles (ZVI NPs) that exhibited selectivity toward higher toxicity to most cancerous...
We report a quantum-dot (QD) organic light-emitting diode (OLED) structure formed on Si substrate scaled down to nanometer dimensions. In our proposed OLED, the junction area is defined by a non-lithographically patterned oxide layer on Si substrate. We utilized gold nanoparticles as oxygen barrier mask during thermal oxidation of Si. Previously, we demonstrated a carrier injection mechanism originating...
The secondary electron emission phenomenon lays down the principle of operation of many physical devices and processes. Although it is fairly well described in the case of irradiation of metals there is still lack of information on the secondary electron emission when originating from dielectrics. In this work we report on the secondary electron emission resulting from very thin layers. It is found...
A method is proposed to calculate the density of deep traps formed in interaction zones based on mesoscopic structure and double electric layer of polymer nanocomposites. Then a space charge modulated breakdown model is utilized to investigate electrical breakdown property and its relation with deep traps in interaction zones. It is found that deep traps formed around independent interaction zones...
Dye sensitized solar cell(DSSC) possessed both low cost and high energy conversion efficiency has attracted considerabale research interests, enabling a promising next generation solar cell. DSSC based on TiO2 photoanode is a low-cost, high efficient photovoltaic device for solar energy conversion. Conventional commercial photoanode consist essentially of anatase crystalline titanium dioxide which...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.