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Metal surface wettability modification by nanosecond laser surface texturing:A review

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Biosurface and Biotribology 2022年第2期8卷 95-120页

作者： Zhifang Liu Tong Niu Yaxi Lei Yuanxin Luo Chongqing University of Technology ChongqingChina Chongqing University College of Mechanical and Vehicle EngineeringChongqingChina China Academy of Engineering Physics MianyangSichuanChina Chongqing University ChongqingChina Correspondence

laser surface texturing(LST)is a non-contact manufacturing process for fabricating functional surfaces in a manner that improves the corresponding wettability,and is widely used in biomedicine and *** surface texturing is a facile approach that is compatible with various materials,can result in a hierarchical texture,and enables a high degree of surface wetting(i.e.,extreme wetting).In addition to surface structures,surface chemical modification is a primary factor in producing extreme wetting *** review discusses the effects of various surface textures and surface chemistries on *** laser parameters for the desired surface texture are based on the fundamental wettability and laser *** particular,bumps in the morphology are conducive to obtaining extreme *** surface chemical strategies result in extreme wetting by different *** paper makes a rigorous evaluation of the laser parameters and optimal surface chemical modifications by elucidating the relationships between the surface structure,surface chemical modification,and wettability,and in so doing,determines the final *** unresolved problems of LST are presented in the *** review provides guidance,development directions,and an integrated framework for LST,which will be useful for fabricating extreme wetting surfaces on various metals.

关键词： extreme wetting surface laser surface texturing nanosecond laser wettability

Surface Micro-Nano Structures on GaN Thin Films Induced by 355 nm nanosecond laser Irradiation

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激光与光电子学进展 2023年第7期60卷 196-202页

作者： Gu Yonggang Niu Jian Yang Jian Dong Fang Xu Hongxing School of Physics and Technology Wuhan UniversityWuhan 430072HubeiChina State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China The Institute of Technological Sciences Wuhan UniversityWuhan 430072HubeiChina

Gallium nitride(GaN)has widespread applications in the semiconductor industry because of its desirable optoelectronic *** fabrication of surface structures on GaN thin films can effectively modify their optical and electrical properties,providing additional degrees of freedom for controlling GaN-based *** with lithography-based techniques,laser processing is maskless and much more *** paper shows how surface micronano structures can be produced on GaN thin films using 355 nm nanosecond laser *** effects of the laser pulse energy,number of pulses,and polarization direction were *** was found that distinct micro-nano structures were formed under different irradiation conditions,and their geometries and elemental compositions were *** results indicate that different types of surface micro-nano structures can be produced on GaN thin films in a controllable manner using 355 nm nanosecond laser *** results of our study provide valuable guidance for the surface modification of GaN-based optoelectronic devices.

关键词： gallium nitride thin films nanosecond laser micro-nano structures laser-induced periodic surface structures

Sub-micrometer-scale chemical analysis by nanosecond-laser-induced tip-enhanced ablation and ionization time-of-flight mass spectrometry

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Nano Research 2018年第11期11卷 5989-5996页

作者： Xiaoping Li Zhisen Liang Shudi Zhang Tongtong Wang Wei Hang Department of Chemistry and the MOE Key Lab ofSpectrochemicalAnalysis & Instrumentation College of Chemistry and ChemicalEngineering Xiamen University Xiamen 361005 China State Key Laboratory of Marine Environmental Science Xiamen University Xiamen 361005 China

The tip-enhanced near-field technique has drawn great attention recently because it is a promising technique for nanoscale chemical analysis when combined with other spectroscopic methods. Furthermore, this integration can improve the spatial resolution of mass spectrometry. In this study, a nanosecond-laser (ns-laser)-induced tip-enhanced ablation and ionization source was coupled to an in-house-built laser ionization time-of-flight mass spectrometer. Sub-micrometer-sized craters (with diameters of 200–300 nm) were observed on titanium (Ti) film coated onto a gold (Au) substrate. The corresponding mass spectra were acquired, which verified that sub-micrometer-sized ablation (and subsequently ionization) could be achieved by the ns-laser-induced tip-enhanced electromagnetic field. In addition, formation of the crater was studied with an increased number of laser pulses. Furthermore, a mass spectrometry imaging (MSI) experiment was performed with potassium chloride (KCl) residue dropped onto nano-patterned gold pillars, achieving 80-nm lateral resolution.

关键词： tip-enhanced near-field technique time-of-flight mass spectrometer nanosecond laser sub-micrometer-scale spatial resolution

A Comparison in laser Precision Drilling of Stainless Steel 304 with nanosecond and Picosecond laser Pulses

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Chinese Journal of Mechanical Engineering 2014年第5期27卷 972-977页

作者： ZHANG Hongyu DI Jianke ZHOU Ming YAN Yu State Key Laboratory of Tribology Tsinghua University Center for Photon Manufacturing Science and Technology Jiangsu University Corrosion and Protection Center Beijing University of Science and Technology

Precision drilling with picosecond laser has been advocated to significantly improve the quality of micro-holes with reduced recast layer thickness and almost no heat affected ***,a detailed comparison between nanosecond and picosecond laser drilling techniques has rarely been reported in previous *** the present study,a series of micro-holes are manufactured on stainless steel 304 using a nanosecond and a picosecond laser drilling system,*** quality of the micro-holes,e.g.,recast layer,micro-crack,circularity,and conicity,etc,is evaluated by employing an optical microscope,an optical interferometer,and a scanning electron ***,the micro-structure of the samples between the edges of the micro-holes and the parent material is compared following etching *** researching results show that a great amount of spattering material accumulated at the entrance ends of the nanosecond laser drilled *** formation of a recast layer with a thickness of;5μm is detected on the side walls,associated with initiation of *** phenomenon is also observed and the circularity of the micro-holes is rather *** regard to the micro-holes drilled by picosecond laser,the entrance ends,the exit ends,and the side walls are quite smooth without accumulation of spattering material,formation of recast layer and *** circularity of the micro-holes is fairly good without observation of tapering ***,there is no obvious difference as for the micro-structure between the edges of the micro-holes and the parent *** study proposes a picosecond laser helical drilling technique which can be used for effective manufacturing of high quality micro-holes.

关键词： laser drilling nanosecond laser picosecond laser helical drilling recast layer

Regulation of cell locomotion by nanosecond-laser-induced hydroxyapatite patterning

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Bioactive Materials 2021年第10期6卷 3608-3619页

作者： Seung-Hoon Um Jaehong Lee In-Seok Song Myoung-Ryul Ok Yu-Chan Kim Hyung-Seop Han Sang-Hoon Rhee Hojeong Jeon Center for Biomaterials Biomedical Research InstituteKorea Institute of Science and Technology(KIST)Seoul02792Republic of Korea Department of Dental Biomaterials Science Dental Research InstituteSchool of DentistrySeoul National UniversitySeoul03080Republic of Korea Department of Oral and Maxillofacial Surgery Korea University Anam HospitalSeoul02841Republic of Korea Division of Bio-Medical Science and Technology KIST SchoolKorea University of Science and TechnologySeoul02792Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul02841Republic of Korea

Hydroxyapatite,an essential mineral in human bones composed mainly of calcium and phosphorus,is widely used to coat bone graft and implant surfaces for enhanced biocompatibility and bone *** a strong implant-bone bond,the bone-forming cells must not only adhere to the implant surface but also move to the surface requiring bone ***,strong adhesion tends to inhibit cell migration on the surface of ***,a cell migration highway pattern that can promote cell migration was prepared using a nanosecond laser on hydroxyapatite *** developed surface promoted bone-forming cell movement compared with the unpatterned hydroxyapatite surface,and the cell adhesion and movement speed could be controlled by adjusting the pattern ***-cell microscopy,cell tracking,and serum protein analysis revealed the fundamental principle of this *** findings are applicable to hydroxyapatite-coated biomaterials and can be implemented easily by laser patterning without complicated *** cell migration highway can promote and control cell movement while maintaining the existing advantages of hydroxyapatite ***,it can be applied to the surface treatment of not only implant materials directly bonded to bone but also various implanted biomaterials implanted that require cell movement control.

关键词： nanosecond laser laser engraving Hydroxyapatite patterning Cell migration control Cell tracking

A comparison of single shot nanosecond and femtosecond polarization-resolved laser-induced breakdown spectroscopy of Al

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Chinese Physics B 2013年第1期22卷 273-277页

作者： Nakimana Agnes 陶海岩郝作强孙长凯高勋林景全 School of Science Changchun University of Science and Technology

Aluminum samples have been analyzed by femtosecond polarization-resolved laser-induced breakdown spectroscopy （fs-PRLIBS）. We compare the obtained spectra with those obtained from nanosecond PRLIBS （ns-PRLIBS）. The main specific features of fs-PRLIBS are that a lower plasma temperature leads to a low level of continuum and no species are detected from the ambient gas. Furthermore, signals obtained by fs-PRLIBS show a higher stability than those of ns-PRLIBS. However, more elements are detected in the ns-PRLIBS spectra.

关键词： polarization-resolved laser-induced breakdown spectroscopy femtosecond laser nanosecond laser shielding

Investigation of Anticorrosive Performance of Oil-infused Slippery and Superhydrophobic Brass Surfaces by laser Texturing

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Journal of Bionic Engineering 2021年第5期18卷 1157-1167页

作者： Li Zhang Chong Zhang Jingrong Tang Bo Hao Mingyang Wang Key Laboratory of Vibration and Control of Aeronautical Power Equipment of Ministry of Education Northeastern University at QinhuangdaoQinhuangdao 066004China

Brass is widely used in machinery,electronic appliances and emerging *** corrosion resistance of laser-induced superhydrophobic surface of brass needs to be *** recent years,bionic surface with slippery coating has attracted much attention because of its excellent corrosion inhibition ***,we first prepared the superhydrophobic surface of brass by nanosecond laser ablation combined with fluoroalkyl silane modification,and then injected silicone oil into the prepared superhydrophobic matrix to obtain a slippery coating *** and EIS tests in 3.5 wt.%NaCl solution showed that the corrosion resistance of the slippery surface was better than that of the superhydrophobic *** study can play a certain role in promoting the development of metal anticorrosive coating and is of great significance in the preparation of slippery surface by laser induction,and provides a convenient and eff ective means for metal anticorrosion in the industrial field.

关键词： nanosecond laser Superhydrophobic Slippery surface Corrosion resistance

Theoretical fundamentals of short pulse laser–metal interaction: A review

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Nanotechnology and Precision Engineering 2020年第3期3卷 105-125页

作者： Xinxin Li Yingchun Guan School of Mechanical Engineering&Automation Beihang UniversityBeijing 100083China National Engineering Laboratory of Additive Manufacturing for Large Metallic Components Beihang UniversityBeijing 100083China

Short and ultrashort pulse lasers offer excellent advantages in laser precision machining mainly because of their high pulse energy and low ablation threshold. The complex process of laser interaction with metals limits the indepth investigation into laser ablation. Numerical simulation is important in the study of fundamental mechanisms. This review explores the start-of-the-art methods for the theoretical simulation of the laser ablation of metals, including plasma formation and expansion. laser-induced period surface structures are also studied.

关键词： laser-material interaction nanosecond laser Femtosecond laser Metals Simulation

Improving hydroxyapatite coating ability on biodegradable metal through laser-induced hydrothermal coating in liquid precursor:Application in orthopedic implants

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Bioactive Materials 2023年第7期25卷 796-806页

作者： Jaeho Park Seung-Hoon Um Youngmin Seo Jaehong Lee Yu-Chan Kim Myoung-Ryul Ok Suk-Won Hwang Jeong-Yun Sun Hyung-Seop Han Hojeong Jeon Biomaterials Research Center Biomedical Research DivisionKorea Institute of Science and Technology(KIST)Seoul02792South Korea Department of Materials Science and Engineering Seoul National University(SNU)Seoul08826South Korea Division of Biomedical Science and Technology KIST SchoolKorea University of Science and TechnologySeoul02792South Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul02841South Korea

During the past decade,there has been extensive research toward the possibility of exploring magnesium and its alloys as biocompatible and biodegradable materials for implantable *** practical medical application,however,has been limited to specific areas owing to rapid corrosion in the initial stage and the consequent *** coatings can significantly reduce the initial corrosion of Mg alloys,and several studies have been carried out to improve the adhesion strength of the coating to the surfaces of the *** composition of hydroxyapatite(HAp)is very similar to that of bone tissue;it is one of the most commonly used coating materials for bone-related implants owing to favorable osseointegration *** this study,HAp was coated on Mg using nanosecond laser coating,combining the advantages of chemical and physical *** heat generated in the liquid precursor by the laser improved the adhesion of the coating through the precipitation and growth of HAp at the localized nanosecond laser focal area and increased the corrosion resistance and cell adhesion of *** physical,crystallographic,and chemical bondings were analyzed to explore the mechanism through which the surface adhesion between Mg and the HAp coating layer *** applicability of the coating to Mg screws used for clinical devices and improvement in its corrosion property were *** liquid environment-based laser surface coating technique offers a simple and quick process that does not require any chemical ligands,and therefore,overcomes a potential obstacle in its clinical use.

关键词： Biodegradable metal HAp coating nanosecond laser Photothermal synthesis Soret effect(thermophoresis)