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This paper presents the design and experimental implementation of an inversion-based feedforward controller to achieve accurate tracking and fast scanning for an atomic force microscopy (AFM). The proposed controller reduces the tracking error by inverting the vibration dynamics and the hysteresis of the piezoelectric tube scanner (PTS). The hysteresis is compensated by directly constructing an inverse...
This paper describes a nanomanipulator system based on an atomic force microscope (AFM) for the measurement of the shear force of a single adhesion cell on a substrate. The shear force is measured based on the deflection of a self-sensitive cantilever that is employed for simple configuration of the AFM manipulator. The shear force behavior of a single cell detaching from the substrate is observed...
This paper presents the design and experimental implementation of an adaptive sliding mode control scheme for a 2D MEMS micromirror with sidewall electrodes(SW), a closed-loop controlled 2D micromirror-based laser scanning microscope system is developed based on NI field-programmable gate array (FPGA) hardware, 2D image of the scanned target are obtained. Controller implementation, image acquisition...
A brief review is presented of current understanding of inert gas nanobubbles in solids in order to permit parallels and contrasts to be made with the recent topic of nanobubbles at solid/liquid interfaces. In particular, the concept of equilibrium and overpresssurized bubbles is discussed and some results are presented on the experimental determination of pressure in nanobubbles. Finally, examples...
In this paper, we present methodology for measuring mechanical properties of nano-coated micro- and nanostructures by pushing. The methods are demonstrated in four applications: interfacial mechanical properties of atomic layer deposited (ALD) thin films, strength of ALD-coated microfibers, adhesion and mechanical properties of thin films, and adhesion between microparts. The measured properties include...
The effects of the offset on the performance of MEMS disk resonator have been analyzed first, then considering the special construction of the MEMS wine-glass resonator, the computing equation of the quality factor has been obtained after establishing the disk-electrode modal. And its accuracy has been demonstrated through a comparison between the standard value and the computation value. Finally,...
This paper reports images of reproducible nanopatterns on hexagonal graphene flakes, produced by modulating the input power of a Near-Field Scanning Microwave Microscope, used at the same time for the characterization of the samples. We have studied the impact of different time exposures to the microwave field, and of different power levels. A possible explanation of the patterning mechanism is given...
The author reports on the concept and design of a hybrid microscope by embedding different microscopy systems in a nanoautomation environment. A Scanning Microwave Microscope incorporated in the vacuum chamber of a Scanning Electron Microscope with a Focused Ion Beam will be capable of imaging the topography, measuring the electromagnetic properties at microwave frequencies and manipulating “samples...
Bluish-green Ba3Si6O9N4:Eu2+ phosphors were synthesized by two-step synthesis processes using BaSiO3 as a precursor. The samples were prepared by high-temperature solid-state reaction, and investigated by X-ray diffraction (XRD) and fluorescence spectrometer photometer (PL) respec-tively. The results of XRD illustrated that two-step method was beneficial to improve phases of Ba3Si6O9N4:Eu2+ phosphor...
This paper presents the design processes and performance of a new piezoactuated nano-positioner with low parasitic rotation. The flexure-based stage is composed of two symmetric flexure guiding mechanisms and two piezo stack actuators (PSAs) which have a 45 degree angle with X and Y directions. By analyzing the layout of the stage with kinematics and finite element analysis (FEA) results, it shows...
Temperature dependence of time-resolved photoluminescence of GaN/AlN quantum dots grown by molecular beam epitaxy has been investigated. Photoluminescence kinetics of GaN/AlN quantum dots is governed by radiative recombination in quantum dots and weakly depends on temperature. Photoluminescence intensity of GaN/AlN quantum dots decreases with increasing temperature. This decrease has been attributed...
In this paper, we propose a PCB-type aerosol sensor to detect number concentration and diameter of nanoscale aerosol particles based on the electrical detection principle, the structure of which is very simple and the size is very small compared with traditional aerosol instruments. The sensor consists of charging stage, precipitation stage and sensing stage. The preliminary experiments on the corona...
Aligned electrospun nanofibers have gained increasing interest due to unique electrical, optical, and mechanical properties. Several works have devoted to reshaping the electrospinning process through modifying the collector structures. However, more investigations are still required. Here, the influence of collector structures and some key electrospinning parameters on fiber alignment by using static...
This paper proposes a design of a dual-probe profilometer, which successfully utilizes a compensation method with two probe modules to scan a 200 nm step height standard sample with 5% scanning error. Compared with traditional profilometers, this design possesses high scanning precise performance without using large and heavy optical flats to increase the flatness when sample stage is moving. The...
There are various precise spatial manipulators that have been employed in the field micro engineering, medical surgery and biology. For this reason, a lot of researches have been done, and a variety of control methods and mechanisms have been developed. However it is very small cases to give the wider working ranges in XYZ as well as large angular motion to such a scalpel or a syringe under the microscope...
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