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.
Nanojet means that the liquid is forced to pass through the nozzle with the nanosize diameter, we report here that nanojet was formed for the first time in lab by heating the PbO coated Pb clusters. In this experiment, the coated clusters are heated to more than 200 C and it was found that the inner Pb core melted and ran out from the cracked outer shell with a 200-nm-long(as long) trail. The in situ...
The investigation into high-performance high current ultra low dropout regulator (LDO) was described in the paper. In the circuit design, prereference is used as a method of controlling the power of circuit to minimize the effect of power variation on functional block parameter, thus achieving the goal of enhancing voltage regulation. In the layout design, trim design for bandgap reference source...
A method to fabricate optical fiber probe nanotips by combination of heated micropulling and static chemical etching has been developed. Firstly, electric arc heating and micropulling process is used to change the configuration of fiber cladding, thus to obtain semi-finished fiber probes with desirable shape. Then the dimension of probe tip is further reduced by hydrofluoric (HF) acid static chemical...
This paper presents an integrated MEMS nanocalorimeter with nanowatt thermal power sensitivity and on-chip control of calorimetric chamber temperatures for measuring structural transitions of biomolecules in solution. The device features two identical polymeric freestanding membranes, resistive temperature sensors and heaters, and a low-noise thermopile differential temperature sensor between the...
Fe3O4 single crystal nanoparticles were prepared in zero field and in a magnetic field. Fe3O4 with well crystallinity is achieved in a magnetic field. X-ray diffraction, transmission electron microscopy, vibrating sample magnetometer and Mossbauer spectrum analysis have confirmed that the magnetic field results in increasing crystallinity, such as decrease surface spin disorder and cation vacancies...
Nano-sized ZnO crystals with catalytic, electrical, optoelectronic, and photochemical properties have been considered as an important candidate in both fundamental research and practical studies. However, controllable synthesis of ZnO in morphology and size with a simple method under mild conditions still represents a challenge. We proved that ZnO nanostructures, including particles and nanorods,...
Nanofabrication is the basis for any NEMS. How small a structure can be made? What are the available technologies for making nanostructures? These are the questions constantly asked by NEMS researchers. This paper gave an overview of current nanofabrication technologies and the challenges for NEMS applications. The techniques for making nanostructures are grouped into direct, indirect and self-assembly...
As the rapid growing of a wide variety of research and development activities on nanotechnology, ultra-high precision nanopositioners are greatly required for nano scale manipulation. In this paper, the design issues of a compliant parallel micromanipulator (CPM) for nanomanipulation is presented from the mechanical design point of view. A CPM is an integration of parallel and compliant mechanisms,...
In recent years, carbon nanotubes (CNTs) attract intense research duo to their novel mechanical and electronic properties and their tremendous potential for future technological applications. In this paper, a CVD synthesis method of well aligned multi-walled carbon nanotubes using iron(II) phthalocyanine as raw material and catalyst was introduced, then the fabrication of carbon nanotubes thin sheets...
The photonic properties of the silicon-on-glass (SOG) nano-films are analyzed first and the reason why SOG nano-films are required for the nanophotonics is pointed. Then the method to fabricate silicon-on-glass nano-film materials for the applications of nano photonics is established. Anodic boning and selective etching are employed. SOG-based nano-films are then studied.
With the rapid progress of ultra short laser technology, two photon photopolymerization(TTP) has been introduced into the domain of microfabrication. Its characterization and process are described in this paper as well as its experimental system. Through the relevant experiments, we optimized the spatial resolution of this method. Under the fine focusing, we obtain the minimum line width of 0.65 mum,...
Two opposite shape transformation processes are observed during the synthesis of alumina nanofibers. In liquid phase alumina hydrate nanospheres are assembled into nanofibers by hydrolysis of aluminum alkoxide, while in vacuum state the nanofibers are disassembled into nanospheres by electron beam irradiation. A number of parameters which dominate the processes are investigated, including the aging...
Based on innovative nano-optical structures and design, an embedded metal-wire nanograting was fabricated for using as a broadband polarizer or polarizing beam splitter to reflect TE-polarized light and transmit TM-polarized light, and AR coating was designed in order to achieve best efficiency for both polarizations. An upper-cladding layer of the same material as the gratings is deposited on the...
In order to understand the formation mechanism of nano- materials during the arc discharge in liquid, serial experiments were conducted on synthesis of nano-materials by arc discharge both in water and in liquid nitrogen. Previous research showed that the stability of arc discharge affected the nano-products significantly. In this paper, the cross magnetic field (CMF) was introduced to disturb the...
The nano manipulation needs miniaturized microtools for minute adjustment or in situ mechanical characterization. This paper demonstrates the feasibility of using bulk silicon electro-thermal expansion micro actuator to drive a lever nano motion platform. The feasibility study includes specimen preparation and dynamic and static characteristic testing. The specimen is made up of a micro electro-thermal...
Described in this paper is a novel method to fabricate the isolated nano-beams in the normal (111) Si wafers. The cantilever and the double clamped beams with nano thickness are anchored through the metal wires, which are isolated to the substrate electrically. The thickness of the beams is determined by dry etching. The beams are released by KOH etching. As the bottom of the beams is (111) plane,...
Transition metal dichalcogenides MS2 (M = Mo, W, Nb, Ta) have the lamellar structures similar to graphite. They are often used as solid lubricants in high/low temperature, high load, vacuum, in which oil lubrication is failed. We have synthesized WS2 nanotubes with decomposition method using Al2O3 template. Moreover, chemical vapor transportation reaction is used to produce NbS2 nanotubes in evacuated...
Functionalized quantum dots have been successfully attached to multi-walled carbon nanotubes over carbodiimide-assisted coupling. Characterization in a transmission electron microscope shows the quantum dots are attached mainly at the opened tips and defect sites on the side-walls of nanotubes, suggesting the covalent nature of the bonding and high selectivity to chemically reactive sites. Due to...
In recent years, interest in the thermal-hydraulics at micro/nano scale keeps increasingly growing owning to the rapid technology thus enabled. It was now accepted that the classical thermal or fluidic theories working well for "macro bulk systems" may become invalid for micro/nano scale geometry. On the contrary, some phenomena seldom occur in the large scale may frequently happen as a...
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.