The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Andreas Ostendorf - One of the best experts on this subject based on the ideXlab platform.
-
Surface modification of NiTi alloy by ultrashort Pulsed Laser shock peening
Surface and Coatings Technology, 2020Co-Authors: Hao Wang, Evgeny L. Gurevich, Yordan Kalchev, Hongcai Wang, Kai Yan, Andreas OstendorfAbstract:Abstract This research paper presents the attempt at ultrashort Pulsed Laser shock peening with absence of absorptive layer and confining medium which could enhance surface microhardness and the abrasion property of NiTi shape memory alloy. The average roughness values of NiTi specimen were measured on the surface, because the roughness would affect the friction resistance. The microhardness and Young's modulus were investigated at different position of single Laser spot by nanoindentation technique. The pin-on-plate sliding abrasion testing were performed with different load-force (0.5 N and 2 N) for different testing time. Results showed that ultrashort Pulsed Laser shock peening treatment would cause a significant improvement on friction coefficient and abrasion property, which was attributed to the change of surface modification, such as roughness, microhardness, microstructure and titanium oxide layer, but the ultrashort Pulsed Laser shock peening treatment did not enhance its tensile strength during present research.
Fu‐xiao Rong - One of the best experts on this subject based on the ideXlab platform.
-
Liquid target Pulsed Laser deposition
Applied Physics Letters, 1995Co-Authors: Fu‐xiao RongAbstract:A novel Pulsed Laser deposition (PLD) technique using a liquid target has been developed. The technique overcomes the problem of solid target deterioration under high power Laser irradiation and prevents splashing of large particulates on the substrate. Choosing an organic liquid containing carbon and hydrogen as a testing target, we have obtained high quality hydrogenated carbon films with a large amount of tetrahedral (diamond‐like) sp3 bonding.
Kong-thon Tsen - One of the best experts on this subject based on the ideXlab platform.
-
Selective Photonic Disinfection of Cell Culture Using a Visible Ultrashort Pulsed Laser
IEEE Journal of Selected Topics in Quantum Electronics, 2015Co-Authors: Shaw-wei D. Tsen, Karen V. Kibler, Bert Jacobs, Nataly P. Podolnikova, Tatiana P. Ugarova, Samuel Achilefu, Kong-thon TsenAbstract:Microbial contamination of cell culture is a major problem encountered both in academic labs and in the biotechnology/pharmaceutical industries. A broad spectrum of microbes, including mycoplasma, bacteria, fungi, and viruses are the causative agents of cell-culture contamination. Unfortunately, the existing disinfection techniques lack selectivity and/or lead to the development of drug-resistance, and more importantly there is no universal method to address all the microbes. Here, we report a novel, chemical-free visible ultrashort Pulsed Laser method for cell-culture disinfection. The ultrashort Pulsed Laser technology inactivates pathogens with mechanical means, a paradigm shift from the traditional pharmaceutical and chemical approaches. We demonstrate that ultrashort Pulsed Laser treatment can efficiently inactivate mycoplasma, bacteria, yeast, and viruses with good preservation of mammalian cell viability. Our results indicate that this ultrashort Pulsed Laser technology has the potential to serve as a universal method for the disinfection of cell culture.
Graham K Hubler - One of the best experts on this subject based on the ideXlab platform.
-
Pulsed Laser deposition of thin films
Pulsed Laser Deposition of Thin Films, 2003Co-Authors: D B Chrisey, Graham K HublerAbstract:Partial table of contents: History and Fundamentals of Pulsed Laser Deposition (J. Cheung). Diagnostics and Characteristics of Laser--Produced Plasmas (D. Geohegan). Particulates Generated by Pulsed Laser Ablation (L.--C. Chen). Angular Distribution of Ablated Material (K. Saenger). Film Nucleation and Film Growth in Pulsed Laser Deposition of Ceramics (J. Horwitz & J. Sprague). Processes Characteristics and Film Properties in Pulsed Laser Plasma Deposition (S. Metev). Commercial Scale--Up of Pulsed Laser Deposition (J. Greer). Pulsed Laser Deposition: Future Trends (T. Venkatesan). Comparison of Vacuum Deposition Techniques (G. Hubler). Pulsed Laser Deposition of High--Temperature Superconducting Thin Films for Active and Passive Device Applications (R. Muenchausen & X. Wu). Pulsed Laser Deposition of Metals (J. Kools). Appendix. References. Index.
-
Pulsed Laser Deposition
MRS Bulletin, 1992Co-Authors: Graham K HublerAbstract:Research on materials grown by Pulsed Laser deposition, or PLD, has experienced phenomenal growth since late 1987 when T. Venkatesan (one of the authors for this issue) and co-workers pointed out that extreme nonequilibrium conditions created by Pulsed Laser melting of YBaCuO allowed in-situ preparation of thin films of this high transition temperature (Tc) superconducting material. Since then, PLD has emerged as the primary means for high throughput deposition of high-quality superconducting thin films for research and devices. This probably came as no surprise to J.T. Cheung (another of this issue's authors), who performed original research in this area and tirelessly labored during the 1980s to convince a skeptical audience of the advantages of PLD.Along with the success of PLD in the arena of high-temperature superconductivity, however, is the explosion of activity in the deposition of many other materials, made possible by the unique features of Pulsed Laser deposition, materials previously not amenable to in-situ thin film growth. Creative minds reasoned that since PLD can deposit a demanding, complex material such as the perovskite structure Y1Ba2Cu3O7-δ, why not other perovskites or multicomponent oxide materials? It also turns out that the range of properties of multicomponent oxides is virtually limitless. They can be metallic, insulating, semiconducting, biocompatable, superconducting, ferroelectric, piezoelectric, and so on. One is not limited to the properties of elements or binary compounds on which the electronics and microelectronics industries are based. Indeed, in a recent review of hybrid ferromagnetic- semiconductor structures, G. Prinz states, “… there has been little work devoted to incorporating magnetic materials into planar integrated electronic (or photonic) circuitry there are potential applications that have no analog in vacuum electronics but that remain unrealized, awaiting the development of appropriate materials and processing procedures.” In Pulsed Laser deposition, we may well have in hand the “appropriate processing procedure” to deposit sequential epitaxial layers of high quality materials that possess profoundly different properties.
Hao Wang - One of the best experts on this subject based on the ideXlab platform.
-
Surface modification of NiTi alloy by ultrashort Pulsed Laser shock peening
Surface and Coatings Technology, 2020Co-Authors: Hao Wang, Evgeny L. Gurevich, Yordan Kalchev, Hongcai Wang, Kai Yan, Andreas OstendorfAbstract:Abstract This research paper presents the attempt at ultrashort Pulsed Laser shock peening with absence of absorptive layer and confining medium which could enhance surface microhardness and the abrasion property of NiTi shape memory alloy. The average roughness values of NiTi specimen were measured on the surface, because the roughness would affect the friction resistance. The microhardness and Young's modulus were investigated at different position of single Laser spot by nanoindentation technique. The pin-on-plate sliding abrasion testing were performed with different load-force (0.5 N and 2 N) for different testing time. Results showed that ultrashort Pulsed Laser shock peening treatment would cause a significant improvement on friction coefficient and abrasion property, which was attributed to the change of surface modification, such as roughness, microhardness, microstructure and titanium oxide layer, but the ultrashort Pulsed Laser shock peening treatment did not enhance its tensile strength during present research.