Kun Lian

Anhui University of Technology

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Pengwei Li

Shanxi University of Traditional Chinese Medicine

Wendong Zhang

North University of China

Jie Hu

Taiyuan University of Technology

Efstathios I. Meletis

The University of Texas at Arlington

Yongjiao Sun

Taiyuan University of Technology

Zhong-geng Ling

Louisiana State University

Zhenting Zhao

Huizhou University

Jost Goettert

Louisiana State University

Serge Zhuiykov

Ghent University Global Campus

Yong Chen

École Normale Supérieure - PSL

Cooperative Institutions

Louisiana State University

Taiyuan University of Technology

Chinese Academy of Sciences

Louisiana State University Agricultural Center

University of Chinese Academy of Sciences

Wuhan University

Huazhong University of Science and Technology

Shanghai Jiao Tong University

Louisiana Tech University

Shenzhen University

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Tribological Behavior of Nanocrystalline Nickel

Journal of Nanoscience and Nanotechnology (2009)

D. J. Guidry Kun Lian Jiuxing Jiang Efstathios I. Meletis

During the last decade, an intensive investigative effort around the globe has been devoted to the understanding of scale effects on materials properties. In spite of their importance, nanoscale effects on tribological properties have attracted little attention. Such effects are of utmost importance to small scale devices such as nano and micro electromechanical systems that contain nanostructured dynamic components that would be difficult to replace or repair. The significant increase in strength arising from the grain size reduction in the nano domain is expected to impact on mechanical processes at asperity contacts that are dominating wear behavior. In the present work, nanocrystalline Ni produced by electroplating was used as a model system to study scale effects on tribological behavior. It was found that compared to bulk (microcrystalline), nanocrystalline Ni can cause a significant reduction in both, the coefficient of friction and wear rate. A consistent relationship was found between grain size, hardness and tribological behavior. It is suggested that the improved tribological behavior of the nanocrystalline Ni is due to the refinement of mechanical processes inhibiting plastic deformation by extensive dislocation motion leading to fracture events.

Nanocrystalline material

Microcrystalline

Severe Plastic Deformation

10.1166/jnn.2009.m25

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Citations (16)

THERMAL STABILITY AND RESULTING SURFACE MECHANICAL PROPERTIES OF ELECTROPLATED NANOCRYSTALLINENi-BASED MEMS MATERIAL

International Journal of Computational Engineering Science (2003)

Kun Lian Jiuxing Jiang Shengping Wen Chengguo Liu Ling Zhou

Nanocrystalline material

10.1142/s1465876303001691

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Citations (1)

USING LIGA BASED MICROFABRICATION TO IMPROVE OVERALL HEAT TRANSFER EFFICIENCY OF PRESSURIZED WATER REACTOR: I. Effects of Different Micro Pattern on Overall Heat Transfer.

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2006)

M. Zhang Samuel Ibekwe G. Li Sen Pang Kun Lian

The Pressurized Water Reactors (PWRs in Figure 1) were originally developed for naval propulsion purposes, and then adapted to land-based applications. It has three parts: the reactor coolant system, the steam generator and the condenser. The Steam generator (a yellow area in Figure 1) is a shell and tube heat exchanger with high-pressure primary water passing through the tube side and lower pressure secondary feed water as well as steam passing through the shell side. Therefore, a key issue in increasing the efficiency of heat exchanger is to improve the design of steam generator, which is directly translated into economic benefits. The past research works show that the presence of a pin-fin array in a channel enhances the heat transfer significantly. Hence, using microfabrication techniques, such as LIGA, micro-molding or electroplating, some special microstructures can be fabricated around the tubes in the heat exchanger to increase the heat-exchanging efficiency and reduce the overall size of the heat-exchanger for the given heat transfer rates. In this paper, micro-pin fins of different densities made of SU-8 photoresist are fabricated and studied to evaluate overall heat transfer efficiency. The results show that there is an optimized micro pin-fin configuration that has the bestmore » overall heat transfer effects.« less

LIGA

Heat transfer enhancement

Source

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Citations (0)

Simulation and analysis of the electro-hydraulic coordinated system for the disc brake system in mining belt conveyor

Mechanics Based Design of Structures and Machines (2024)

Meisheng Yang Wen Jiang Jiahan Bao Kun Lian

Disc brake

Belt conveyor

Conveyor belt

Conveyor system

10.1080/15397734.2024.2379047

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Controllable synthesis of branched hierarchical ZnO nanorod arrays for highly sensitive hydrazine detection

Applied Surface Science (2015)

Jie Hu Zhenting Zhao Yongjiao Sun Ying Wang Pengwei Li

Nanorod

Amperometry

Hydrazine (antidepressant)

Electrochemical gas sensor

Linear range

10.1016/j.apsusc.2015.12.165

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Citations (22)

A Sensitive Hydrazine Electrochemical Sensor Based on Zinc Oxide Nano-Wires

Journal of The Electrochemical Society (2014)

Zhenting Zhao Yongjiao Sun Pengwei Li Shengbo Sang Wendong Zhang

A sensitive hydrazine electrochemical sensor based on Zinc oxide nano-wires (ZnO NWs) synthesized from low temperature hydrothermal method has been fabricated using an add-on technique. The morphology, crystalline structures, and composition of synthesized ZnO NWs were characterized by scanning electron microscopy, X-ray powder diffraction, energy dispersive spectroscopy, and high-resolution transmission electron microscopy. The batch-made ZnO NWs were used as electrocatalytic material and modified on the gold electrode surface through a printing-like method via Nafion to obtain Nafion/ZnO NWs/Au hydrazine electrochemical sensor. To optimize performance, the effect of the ZnO modified quantity on sensitivity was evaluated by cyclic voltammetry, electrochemical impedance spectroscopic, and single-potential amperometry techniques. The results show that the optimum ZnO NWs modified quantity is about 170 μg·cm−2. The optimized Nafion/ZnO NWs/Au hydrazine electrochemical sensor has a high sensitivity of 3.8 μA·μM−1·cm−2, a short response time of 3 s, and a very low detection limit of 0.0144 μM with a linear hydrazine concentration response range from 3.0 to 562 μM.

Amperometry

Nafion

Hydrazine (antidepressant)

Electrochemical gas sensor

Nanomaterials

10.1149/2.095406jes

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Citations (27)

A highly sensitive electrochemical sensor based on Cu/Cu₂O@carbon nanocomposite structures for hydrazine detection

Analytical Methods (2015)

Zhenting Zhao Ying Wang Pengwei Li Shengbo Sang Wendong Zhang

A kind of carbon-coated Cu/Cu₂O nanocomposite material (Cu/Cu₂O@carbon) was coated on a glassy carbon electrode for electrochemical detection of hydrazine (N₂H₄).

Hydrazine (antidepressant)

Electrochemical gas sensor

Carbon fibers

10.1039/c5ay02122g

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Citations (21)

Environment-Induced Deformation Localization During Transgranular Stress Corrosion Cracking

CORROSION (1996)

Kun Lian Efstathios I. Meletis

Abstract The nucleation and evolution of deformation patterns occurring during transgranular stress corrosion cracking (TGSCC) were studied in an attempt to produce new alternatives for addressing the nature of the embrittlement process. Flat, tensile α-brass (72% Cu-28% Zn) specimens were tested in 5 M aqueous ammonia (NH4OH) solution at a strain rate of 1 × 10−5/s. Slip-band spacing (SBS) and slip-band height (SBH) were measured as a function of strain by conducting interrupted experiments in the SCC environment and were compared with those developed during laboratory air experiments. The presence of the TGSCC-causing environment during straining promoted localized plastic deformation at the near-surface region and, more importantly, produced an entirely different deformation pattern from that developed in laboratory air. The deformation evolved in the presence of the TGSCC electrolyte was highly localized, exhibiting small SBS but large SBH. Also, a periodicity was exhibited by the crack initiation pro...

Lüders band

Brass

Embrittlement

10.5006/1.3292122

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Citations (33)

Influence of oxygen plasma treatment on the microstructure of SnOx thin films

Thin Solid Films (2002)

J. C. Jiang Kun Lian Efstathios I. Meletis

Nanocrystalline material

10.1016/s0040-6090(02)00288-2

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