Jiangyou Long

Jiangyou Long
GuangDong University of Technology · School of Electromechanical Engineering

PhD

About

48
Publications
12,228
Reads
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1,607
Citations
Education
September 2012 - July 2017
Tsinghua University
Field of study
  • Materials Sciences and Engineering
September 2008 - July 2012
Tsinghua University
Field of study
  • Mechanical Engineering

Publications

Publications (48)
Article
Micro/nano-textured metal or metal oxide surfaces that are naturally superhydrophilic will spontaneously transform into hydrophobic even superhydrophobic after being exposed to ambient air due to the adsorption of airborne organics. This fast wettability transition not only affects the true evaluation of surface wettability but also deteriorates th...
Article
Femtosecond (fs) laser has been proved to be a reliable tool for high-quality micromachining on silicon carbide (SiC) surfaces. In this work, we studied the formation of dense nanostructures on fs laser-processed SiC surfaces. These nanostructures are composed of lots of amorphous silicon dioxide (SiO2) nanoparticles with diameters ranging from 5 n...
Article
Metallic microchannels have been widely applied in two-phase heat transfer devices to satisfy the high heat flux cooling requirements of compact devices, but the pool boiling heat transfer and bubble dynamics over metallic microchannels have been rarely reported. Herein, we investigate the pool boiling heat transfer and bubble dynamics over V-shape...
Article
A laser-induced backside wet etching technique using near-infrared laser sources (N-LIBWE) has been proposed for high-quality micromachining of optical glass. Compared with conventional LIBWE using organic dye solutions with high absorption coefficients (∼104–105 cm−1) as the liquid absorbent, the transition metal salt solution used in N-LIBWE show...
Article
As a maskless method, femtosecond (fs) laser micromachining has been used to fabricate microstructures on polymethyl methacrylate (PMMA) substrates, but the fs laser ablation promotes the formation of pores and redeposited debris, generating high surface roughness ranging from hundreds of nanometers to several micrometers. Herein, high-quality thre...
Article
A vapor chamber (VC) is a two-phase device used to spread heat in two dimensions, which is widely used in high heat flux applications such as the cooling of high-power chips and light-emitting diodes. The wicks inside a VC greatly affect the device performance, which is commonly prepared by sintering metal powders or fibers. Herein, we directly pre...
Article
The spontaneous wettability transition of metal and metal oxide surfaces caused by the adsorption of airborne volatile organic compounds (VOCs) has been frequently reported. In this study, we examine the effects of surface oxides and nanostructures on the wettability transition as well as the stability of the acquired hydrophobicity under boiling c...
Article
Femtosecond (fs) lasers have been proved to be reliable tools for high-precision and high-quality micromachining of ceramic materials. Nevertheless, fs laser processing using a single-mode beam with a Gaussian intensity distribution is difficult to obtain large-area flat and uniform processed surfaces. In this study, we utilize a customized diffrac...
Article
We observe and study the growth and collapse of cavitation bubbles generated during the pulsed laser ablation of submerged targets in three liquid environments, water, ethanol, and n-butanol, utilizing a stroboscopic shadowgraphy system. The transient images of the final stage of bubble collapse when the bubble volume is at a minimum are captured....
Article
Achieving sustainable dropwise condensation is still a challenge for the industrial applications of bio-inspired superhydrophobic surfaces in the field of phase-change heat transfer. In this work, 3D conical microtextures covered by various nanostructures were prepared by utilizing femtosecond laser micromachining and solid-liquid reactions, where...
Article
On laser shock peening and underwater laser micromachining, previous studies have shown that the immersion depth of the sample significantly affects laser ablation of submerged targets; however, the underlying mechanisms are still obscure. In this work, we observe and study the formation, growth, and collapse of cavitation bubbles generated during...
Article
Full-text available
In this study, we observe and study the early evolution of cavitation bubbles generated during pulsed laser ablation of titanium targets in different liquid environments utilizing a high-resolution stroboscopic shadowgraphy system. A hydrodynamic model is proposed to calculate the early pressure changes within the bubble and in the surrounding flui...
Article
Ultrathin microscale platinum resistive thermometers are of key value to transient temperature measurements. Neither transparent oxide substrates nor femtosecond laser patterning have been investigated for the fabrication of Pt thin film thermometers. Here, we have fabricated a laser machined, 50 μm wide and 50 nm thick, serpentine, Pt thin film se...
Article
Conductive metallic micropatterns on transparent glass substrates are desired in lots of applications, e.g. elec-trofluidic devices and micrototal analysis systems. Due to the significant differences in material properties between metal and glass, the fabricated metallic micropatterns prone to show limited bonding strength to the glass substrates....
Preprint
Full-text available
Ultrathin microscale resistive thermometers are of key value to many applications. Here we have fabricated a laser machined 50 ${\mu}$m wide and 50 nm thick serpentine Pt thin film sensor capable of sensing temperatures up to 650 ${^\circ}$ C over multiple heating and cooling cycles. Various materials and associated processing conditions were studi...
Article
Hierarchical surface micro- and nanostructures have attracted much attention in recent years due to their important roles in many applications. Among numerous techniques, ultrafast laser surface texturing technology has gained great success in recent years due to its flexibility, and controllability in preparing large-area hierarchical micro- and n...
Article
The low-cost fabrication of large-area hierarchical micro- and nanostructures is critical for the practical applications of superhydrophobic metallic surfaces. Instead of using ultrafast lasers, low-cost near-infrared nanosecond (ns) lasers were used in this study to induce the formation of hierarchical micro- and nanostructures on copper surfaces....
Article
Full-text available
Metallic super‐hydrophobic surfaces with ultralow water adhesion are essential for a wide variety of applications, such as enhanced condensation heat transfer and anti‐icing applications. Broccoli‐like multiscale micro‐ and nanostructures composed of four different microscale and nanoscale features are fabricated on different metal surfaces by an i...
Article
Functional metal surfaces with minimum optical reflection over broadband spectrum have essential importance for optical and optoelectronic devices. However, the intrinsically large optical impedance mismatch between metals and the free space causes a huge obstacle in achieving such a purpose. We propose and experimentally demonstrate a general puls...
Article
W/Cu joining is key for the fabrication of plasma facing components of fusion reactors, which however is very challenging due to the low bonding strength and high W/Cu interface thermal stress as a result of the immiscible nature of W-Cu binary system and thermal expansion coefficient mismatch between W and Cu. In this paper, we proposed a method f...
Article
Full-text available
Former studies have found that water droplets on the rice leaves exhibit anisotropic sliding behavior, which is mainly caused by the anisotropic groove-like surface microstructures. Similar groove-like surface microstructures and anisotropic sliding behavior of water droplets can also be found on some other plants, such as the reed leaves. In this...
Article
W/Cu joining is key for the fabrication of plasma facing components for fusion reactors, which however is very challenging due to the immiscible nature of Cu-W binary system and the mismatch of thermal expansion coefficient between W and Cu. In this research, we proposed a method for comprehensive enhancement of the bonding strength and heat transf...
Article
Full-text available
具有特殊浸润性的仿生表面包括超亲水表面以及各种类型的超疏水表面。由于这些表面具有自清洁、抗结冰、减阻等性能,近年来受到了国际学术界的广泛关注。随着超快激光器的快速发展,许多研究表明,通过超快激光可以制备各种类型的特殊浸润性表面。相对于其他方法而言,超快激光表面处理技术具有简单、灵活、可控的特点。结合本课题组在该领域的研究工作,本篇文章综述了这一研究领域的最新研究成果。 Bio-inspired surfaces with special wettabilities include superhydrophilic surfaces and all kinds of superhydrophobic surfaces. Since these surfaces show properties...
Article
Realizing superhydrophobicity meanwhile high transparency on polydimethylsiloxane (PDMS) surface enlarges its application fields. We applied a femtosecond laser to fabricate well designed structures combining micro-grooves with micro-holes array on mirror finished stainless steel to form a template. Then liquid PDMS was charged for the duplicating...
Article
Micro/nano surface structures show great significance in both fundamental research and practical applications. Imprinting technique is widely used to fabricate micro/nano surface structures on polymers at low temperature, but barely implemented on metals. In this paper, femtosecond (fs) laser was used to fabricate micro/nano surface structures on t...
Article
Full-text available
The Cassie-state stability plays a vital role for the applications of metallic superhydrophobic surfaces. Although a large number of papers have reported the superhydrophobic performance by various surface micro/nano structures, the knowledge on which kind of micro/nano structure contributes significantly to the Cassie-state stability especially un...
Article
Infrared antireflection is an essential issue in many fields such as thermal imaging, sensors, thermoelectrics, and stealth. However, limited antireflection capability, narrow effective band, and complexity as well as high cost in implementation represent the main unconquered problems, especially on metal surfaces. By introducing precursor micro/na...
Article
Antireflection properties on material surfaces are of great value in many fields including solar utilization, sensing, stealth, aerospace technology, military, etc. Through the interaction of picosecond laser with metallic materials, unique micro/nano hierarchical structures are produced on Cu, Al, Ti, and H13 steel surfaces, realizing significant...
Article
In recent years, the anti-icing properties of superhydrophobic surfaces attract tremendous attention of researchers. However, the effect of surface microstructures and wettabilities on their anti-icing properties is still controversial. Different microstructures on copper surface are fabricated by a femtosecond laser. After surface chemical modific...
Article
Full-text available
Superhydrophobic surfaces with tunable water adhesion have attracted much interest in fundamental research and practical applications. In this paper, we used a simple method to fabricate superhydrophobic surfaces with tunable water adhesion. Periodic microstructures with different topographies were fabricated on copper surface via femtosecond (fs)...
Article
The wettability of metal oxides is vital to many applications including water erosion, filtration, and bioimplantation. In this work, the authors studied the wettability conversion behavior of picosecond laser structured copper surfaces in different atmospheres. The copper surfaces showed hydrophilicity initially after being irradiated by a picosec...
Article
The self-cleaning lotus-leaf-like superhydrophobic surfaces are of great importance for various potential applications. Micro craters in hexagonal matrix with nano substructures are effectively fabricated on mold steel (H13) with an area of 25 mm×25 mm by means of a high-power picosecond laser in cooperated with a high-speed galvo scanner. This kin...
Article
The simultaneous generation of nanostructures and redeposited nanoparticles on copper surfaces through their direct ablation in air by a high power and high repetition rate ps laser was demonstrated. Basic and detailed analysis on the formation and the size distribution of nanoparticles spreading over the nanostructured copper surfaces was performe...
Article
Full-text available
A surface micro/nano structuring technique was demonstrated for colorizing metal surfaces with a picosecond laser. Sequential color change from black to pink was realized on copper surfaces by simply changing the ps laser scanning speeds. Systematic analyses on the spectral response and microstructure characteristics were reported. The spectrum shi...
Article
Recently global researches on graphene materials are exploding due to their outstanding properties. Laser technology is one of the most powerful manufacturing approaches, which makes graphene become a promising candidate for next generation electronic materials. In this work, the reaction mechanism of laser technology on preparation of graphene is...
Article
To render metal surfaces to various desirable colors without changing their chemical composition is necessary and important in many applications including decoration, marking, data storage, and anti counterfeiting. In this paper, we report a surface micro/nano texturing technique by utilizing a high power (with an average power up to 100 W) and hig...
Article
Multilayer graphene generated by chemical vapor deposition (CVD) method is irradiated by CO2 laser in vacuum with different power densities and irradiation time. Raman spectroscopy is used to clarify the influences of laser power density and irradiation time on the structure modification. At a laser power density of 13 W/cm2, the decrease of D-band...

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Projects

Projects (2)
Project
Micrometer precision over meter-size samples.
Project
Novel high-performance thermal management devices.