Controllable morphology evolution of electrodeposited ZnO nano/micro-scale structures in aqueous solution

2009 ◽  
Vol 30 (5) ◽  
pp. 1704-1711 ◽  
Author(s):  
Feng Xu ◽  
Yinong Lu ◽  
Yan Xie ◽  
Yunfei Liu
Keyword(s):  
Aqueous Solution ◽  
Morphology Evolution ◽  
Micro Scale ◽  
Scale Structures

scholarly journals Drug-Delivery System Based on Salmon DNA Nano- and Micro-Scale Structures

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Yunwoo Lee ◽  
Sreekantha Reddy Dugansani ◽  
So Hee Jeon ◽  
Soon Hyoung Hwang ◽  
Jae-Hyun Kim ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Drug Delivery System ◽  
Delivery System ◽  
Micro Scale ◽  
Scale Structures

scholarly journals The Electric-Field-Driven Fusion Jetting 3D Printing for Fabricating High Resolution Polylactic Acid/Multi-Walled Carbon Nanotube Composite Micro-Scale Structures

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1132
Author(s):  
Xiaoqiang Li ◽  
Guangming Zhang ◽  
Wenhai Li ◽  
Zun Yu ◽  
Kun Yang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
High Resolution ◽  
3D Printing ◽  
Electric Field ◽  
Polylactic Acid ◽  
Line Width ◽  
Micro Scale ◽  
Biomimetic Scaffolds ◽  
Multi Walled Carbon Nanotube ◽  
Scale Structures

Existing 3D printing techniques are still facing the challenge of low resolution for fabricating polymer matrix composites, inhibiting the wide engineering applications for the biomedical engineering (biomimetic scaffolds), micro fuel cells, and micro-electronics. In order to achieve high resolution fabrication of polylactic acid (PLA)/multi-walled carbon nanotube (MWCNT) composites, this paper presents an electric-field-driven (EFD) fusion jetting 3D printing method by combining the mixing effect and material feeding of the micro-screw and the necking effect of Taylor cone by the EFD. The effects of main process parameters (the carbon loading, the voltage, the screw speed, and the printing speed) on the line width and the printing quality were studied and optimized. To demonstrate the printing capability of this proposed method, meshes with line width of 30 µm to 100 μm and 1 wt.% to 5 wt.% MWCNT for the application of conductive biomimetic scaffold and the anisotropic flexible meshes were prepared. The electrical properties were investigated to present the frequency dependence of the alternating current conductivity and the dielectric loss (tanδ), and the microstructures of printed structures demonstrated the uniformly dispersed MWCNT in PLA matrix. Therefore, it provides a new solution to fabricate micro-scale structures of composite materials, especially the 3D conductive biomimetic scaffolds.

MORPHOLOGY EVOLUTION AT NANO- TO MICRO-SCALE

2008 ◽  
Vol 01 (03) ◽  
pp. 167-172 ◽  
Author(s):  
XU ZHAO ◽  
XIUE REN ◽  
CONGTING SUN ◽  
XU ZHANG ◽  
YUNFEI SI ◽  
...  
Keyword(s):  
Functional Materials ◽  
Molar Ratio ◽  
Morphology Evolution ◽  
Organic Crystals ◽  
Micro Scale ◽  
Ph Values ◽  
Whole Process ◽  
Growth Phenomenon ◽  
Growth System ◽  
Bonding Characteristics

Morphology evolution of inorganic/organic crystals during crystallization is a universal growth phenomenon. In this work, we have developed a capping agent-assisted strategy to clearly identify the whole process of morphology evolution in solution growth system. One kind of morphology evolution trend with three types of morphologies of cuprous oxide ( Cu 2 O ) was kinetically observed at varying the molar ratio of EDTA/ Cu (II) under three different pH values. Two kinds of morphology evolution trends of zinc oxide ( ZnO ) were also kinetically observed in the presence of H 2 O 2 and CH 3 COOH (HAc), respectively. Simulation results show that the morphology evolution of nano- to micro-scale crystals is strongly dependent on the bonding characteristics of a growth system. The present strategy positively explores the interesting principles of morphology evolution of functional materials, and can be widely extended to nano- to micro-scale devices research.

scholarly journals High Resolution Brillouin Sensing of Micro-Scale Structures

2018 ◽  
Vol 8 (12) ◽  
pp. 2572 ◽  
Author(s):  
Atiyeh Zarifi ◽  
Birgit Stiller ◽  
Moritz Merklein ◽  
Benjamin Eggleton
Keyword(s):  
Spatial Resolution ◽  
Measurement Techniques ◽  
High Sensitivity ◽  
Photonic Devices ◽  
Small Dimension ◽  
Detection Techniques ◽  
Micro Scale ◽  
Scale Structures ◽  
Distributed Measurement ◽  
On Chip

Brillouin distributed measurement techniques have been extensively developed for structural health monitoring using fibre optic nerve systems. The recent advancement in the spatial resolution capabilities of correlation-based Brillouin distributed technique have reached the sub-mm regime, making this approach a suitable candidate for monitoring and characterizing integrated photonic devices. The small dimension associated with the short length of these devices—on the order of the cm- and mm-scale—requires high sensitivity detection techniques and sub-mm spatial resolution. In this paper, we provide an overview of the different Brillouin sensing techniques in various micro-scale structures such as photonic crystal fibres, microfibres, and on-chip waveguides. We show how Brillouin sensing is capable of detecting fine transverse geometrical features with the sensitivity of a few nm and also extremely small longitudinal features on the order of a few hundreds of μ m . We focus on the technique of Brillouin optical correlation domain analysis (BOCDA), which enables such high spatial resolution for mapping the opto-acoustic responses of micro-scale waveguides.

Non-Contact Mechanical Testing and Characterization of Micro-Scale Structures

2006 ◽  
Author(s):  
Jian Chen ◽  
Ganesh Subramanian ◽  
Justin Ricci ◽  
Liang Ban ◽  
Cetin Cetinkaya
Keyword(s):  
Plane Motion ◽  
Cantilever Beams ◽  
Micro Scale ◽  
New Class ◽  
Sensor Platform ◽  
Out Of Plane ◽  
Modes Of Vibration ◽  
Scale Structures ◽  
Micro Cantilever

A non-contact testing and characterization method based on air-coupled acoustic excitation and interferometric displacement measurements of micro-scale MEMS structures at room conditions is introduced. In demonstrating its potential uses in testing and characterization, the present non-contact approach is applied to (i) micro-cantilever beams and (ii) rotational disk oscillators. Air-coupled multi-mode excitation of micromechanical cantilever-type oscillators under a pulsed acoustic field generated by an air-coupled transducer is demonstrated and reported. Also, the testing and characterization of a micro-scale rotational disk oscillator developed for a new class of sensor platform is demonstrated. The main design objective of the rotational disk oscillator class is to overcome the out-of-plane motion related sensitivity limitations of the cantilever-based sensors at high frequency operations. The dynamics of the rotational disk oscillators is more complex than micro-cantilever beams due to its in-plane motion in addition to its various out-of-plane modes of vibration. The fabrication of a rotational disk oscillator requires a suspended disk whose underside is visibly inaccessible due to a narrow micro-gap. In addition to the dynamic characterization of the cantilever beams and rotational disk oscillators, the current investigation demonstrates that the presented approach can address unique structural concerns such as the verification of a gap separation of the rotational oscillator from the underlying silicon substrate. Utilizing the proposed technique, the resonant frequencies of the oscillator structures are obtained and its potential uses in the testing and characterization of micro-scale structures are discussed. The major specific advantages of the introduced approach include that (i) its noncontact nature can eliminate testing problems associated with stiction and adhesion, and (ii) it allows direct mechanical characterization and testing of components and sub-components of a micro-scale devices.

Deburring of Micro-Scale Structures Machined in Milling

2010 ◽  
Author(s):  
Takashi Matsumura ◽  
Tsuyoshi Konno ◽  
Shouta Tobe ◽  
Takafumi Komatsu
Keyword(s):  
Water Jet ◽  
Point Of View ◽  
Micro Milling ◽  
Burr Formation ◽  
Micro Cutting ◽  
Structured Surfaces ◽  
Micro Scale ◽  
Process Sequence ◽  
Scale Structures ◽  
Supporting Device

Recently micro cutting has been applied to manufacturing of micro devices. Burr formation is a troublesome problem in micro cutting. From the point of view of the required accuracy, burr removal in the micro manufacturing cannot be performed by the manual operations or the additional cuttings. The paper presents a deburring process to remove the burrs on the micro-scale structured surfaces, which are machined in micro milling. In order to remove the burrs on the pillars in the structures, the study examines burr removal milling, polishing and water jet finishing. Burr removal milling leaves the cutter traces with adhesion of the chips on the pillars. Polishing finishes the surfaces with removing the burrs on the top of the pillars. A supporting device is used for protecting the edge shapes of the pillars in polishing. Then, the burrs on the side of the pillars can be removed in water jet finishing. A water jet machine driven by a low pressure pump is developed to remove the burrs without losing their shapes. The process sequence of polishing and water jet finishing is effective in removing the burrs in micro milling. The presented process is discussed to manufacture the micro-scale structures in mechanical manner based on the axiomatic design.

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