다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Laser-induced graphene (LIG) is a 3D porous material prepared by direct laser writing with a CO2 laser on carbon materials in ambient atmosphere. This technique combines 3D graphene preparation and patterning into a single step without the need for wet chemical steps. Since its discovery in 2014, LIG has attracted broad research interest, with several papers being published per month using this approach. These serve to delineate the mechanism of the LIG-forming process and to showcase the translation into many application areas. Herein, the strategies that have been developed to synthesize LIG are summarized, including the control of LIG properties such as porosity, composition, and surface characteristics, and the advancement in methodology to convert diverse carbon precursors into LIG. Taking advantage of the LIG properties, the applications of LIG in broad fields, such as microfluidics, sensors, and electrocatalysts, are highlighted. Finally, future development in biodegradable and biocompatible materials is briefly discussed.

Laser-Induced Graphene: From Discovery to Translation.

Electrospinning (electrostatic fiber spinning) is a modern and efficient method which uses electric field to produce fine fibers which their diameter can reduce to nanometers. These fibers have wide applications in industry such as filtration, composite materials, medical, membrane, etc. In this paper a review of electrospinning process, its products and applications are explained.

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Review for application of electrospinning and electrospun nanofibers technology in textile industry

Laser Beam MicroMachining (LBMM) – A review

A flexible non-enzymatic glucose sensor based on copper nanoparticles anchored on laser-induced graphene

Recently graphene-based materials (GBMs) have gained tremendous attention for their enormous potentials for various functional devices due to their excellent physical and chemical propertie...

Laser-induced graphene: preparation, functionalization and applications

In this study, influence of columnar grain morphology on thermal shock resistance of laser re-melted ZrO 2 -7 wt.% Y 2 O 3 thermal barrier coatings (TBCs) has been researched. The influence of variation in columnar grain microstructures on the fatigue mechanism of laser re-melted coatings in thermal shock experiments has been investigated. The thermal shock experiments have confirmed the positive effect of small grain size on thermal fatigue life. This is thought to have resulted from an increase in the number of grain boundaries that restrict the grain motion during deformation. Further, “void effect” could be responsible for promoting peeling of the laser re-melted coatings when spallation is less than 10% because it can cause a relatively large tensile stress between the columnar grains and the underlying splats. However, it is found to have negligible effect on the shedding of LRCs shed when the spallation percentage is 20% or more because the remaining LRCs are relatively homogeneous having less or no voids. The presence of separate columns and large intergranular clearance may have allowed better compliance of stress through free-movement of the individual columnar grains. There are many more restrictions on stress relaxation. An additional moving resistance is found to be present at the undulate intergranular interfaces for the irregular gear-like columnar grains with small inter-crystalline space and large intergranular contact area. The one-piece structure with pseudo-columnar grains was found to improve the thermal cycle lifetime slightly. It is believed to be due to its relatively lower strain tolerance as well as lower fracture toughness as compared to that of the structure with separate columnar grains.

Influence of columnar grain microstructure on thermal shock resistance of laser re-melted ZrO2-7 wt.% Y2O3 coatings and their failure mechanism

Study on hierarchical structured PDMS for surface super-hydrophobicity using imprinting with ultrafast laser structured models

Laser drilling of inclined holes on Ni-based superalloys coated with thermal barrier coatings (TBC) was studied using numerical simulation and experiments. Two types of drilling, three steps-laser drilling (TSLD) method and the one step laser drilling (OSLD), were employed for making comparison. The simulation results demonstrate that relatively strong vortex effect of assist gas at hole entrance and the drilling allowance of the substrate hole can deflect the trajectories of melt flow from leading edge TBC wall. This phenomenon may isolate leading edge of the hole from the ejecting molten material. Thus, shearing stress effect was prevented. The characteristics of TBC delamination, spatter at the TBC leading edge and re-melted cracks along the TBC trailing edge are investigated by comparing the characteristics of the melt flow obtained via simulation and experiment. The combined results suggest that the TBC/substrate multilayer can avoid these defects applying the TSLD technology.

Effect of drilling allowance on TBC delamination, spatter and re-melted cracks characteristics in laser drilling of TBC coated superalloys

Carbon fiber reinforced silicon carbide (C/SiC) was processed with an 800 nm femtosecond laser, and the results were analyzed through theoretical calculations and wave optics simulations. In the ablation experiment, C/SiC morphologies for different parameters such as laser power, defocus distance, and scanning speed were compared. It was found that the roughness prior to processing of the C/SiC surface noticeably affects the ablation effect. Beam waist radius, curvature radius, and electric field intensity of the femtosecond laser were calculated theoretically and the wave optics module was simulated in finite element software. Causes for the different morphologies can be explained directly through the simulation results from the perspective of the electromagnetic field. It was found that the microgroove quality of C/SiC processed subject to the femtosecond laser with high fluence is relatively higher and that the edge oxidation of the processing area can be effectively controlled through argon protection. The comparison between the simulation and the experiment results deepens the understanding of the ablation mechanism, which can provide references for the improvement in processing quality of ceramic matrix composites (CMC) by laser treatment.

Kedian Wang

Papers

Laser-induced graphene: preparation, functionalization and applications

Influence of columnar grain microstructure on thermal shock resistance of laser re-melted ZrO2-7 wt.% Y2O3 coatings and their failure mechanism

Study on hierarchical structured PDMS for surface super-hydrophobicity using imprinting with ultrafast laser structured models

Effect of drilling allowance on TBC delamination, spatter and re-melted cracks characteristics in laser drilling of TBC coated superalloys

Influence of surface morphology on processing of C/SiC composites via femtosecond laser