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Micro electrical discharge machining (micro-EDM) is a thermo-electric and contactless process most suited for micro-manufacturing and high-precision machining, especially when difficult-to-cut materials, such as super alloys, composites, and electro conductive ceramics, are processed. Many industrial domains exploit this technology to fabricate highly demanding components, such as high-aspect-ratio micro holes for fuel injectors, high-precision molds, and biomedical parts.Moreover, the continuous trend towards miniaturization and high precision functional components boosted the development of control strategies and optimization methodologies specifically suited to address the challenges in micro- and nano-scale fabrication.This Special Issue showcases 12 research papers and a review article focusing on novel methodological developments on several aspects of micro electrical discharge machining: machinability studies of hard materials (TiNi shape memory alloys, Si3N4–TiN ceramic composite, ZrB2-based ceramics reinforced with SiC fibers and whiskers, tungsten-cemented carbide, Ti-6Al-4V alloy, duplex stainless steel, and cubic boron nitride), process optimization adopting different dielectrics or electrodes, characterization of mechanical performance of processed surface, process analysis, and optimization via discharge pulse-type discrimination, hybrid processes, fabrication of molds for inflatable soft microactuators, and implementation of low-cost desktop micro-EDM system.

Technology: general issues --- electrodischarge micromachining --- drilling --- cubic boron nitride --- foil queue microelectrode --- micro-EDM --- step effect --- tapered structure --- wire electrical discharge grinding (WEDG) --- micromoulding --- soft microrobotics --- electrical discharge machining (EDM) --- Tungsten cemented carbide (WC-Co) --- desktop micro-electrical discharge machining (micro-EDM) system --- cut-side micro-tool --- micro-holes --- EDM --- SR --- TWR --- PMEDM --- MRR --- electro-discharge treatment --- Ti-6Al-4V --- MWCNTs --- surface characterization --- wear resistance --- corrosion resistance --- composite 3D microelectrode --- diffusion bonding --- step --- 3D microstructure --- material processing --- DSS-2205 alloy --- electric-discharge machining --- surface integrity --- surface wettability --- ceramic composite --- micro-EDM milling --- pulse discrimination --- Micro-electro-discharge machining (μEDM) --- liquid-metal electrode --- Galinstan --- Zirconium Boride --- silicon carbide fibers --- silicon carbide whiskers --- advanced material --- TiNi shape memory alloy --- TiC powder --- surface modification --- microhardness --- electrochemical discharge machining --- laser machining --- glass --- micro-groove --- n/a

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Micro electrical discharge machining (micro-EDM) is a thermo-electric and contactless process most suited for micro-manufacturing and high-precision machining, especially when difficult-to-cut materials, such as super alloys, composites, and electro conductive ceramics, are processed. Many industrial domains exploit this technology to fabricate highly demanding components, such as high-aspect-ratio micro holes for fuel injectors, high-precision molds, and biomedical parts.Moreover, the continuous trend towards miniaturization and high precision functional components boosted the development of control strategies and optimization methodologies specifically suited to address the challenges in micro- and nano-scale fabrication.This Special Issue showcases 12 research papers and a review article focusing on novel methodological developments on several aspects of micro electrical discharge machining: machinability studies of hard materials (TiNi shape memory alloys, Si3N4–TiN ceramic composite, ZrB2-based ceramics reinforced with SiC fibers and whiskers, tungsten-cemented carbide, Ti-6Al-4V alloy, duplex stainless steel, and cubic boron nitride), process optimization adopting different dielectrics or electrodes, characterization of mechanical performance of processed surface, process analysis, and optimization via discharge pulse-type discrimination, hybrid processes, fabrication of molds for inflatable soft microactuators, and implementation of low-cost desktop micro-EDM system.

electrodischarge micromachining --- drilling --- cubic boron nitride --- foil queue microelectrode --- micro-EDM --- step effect --- tapered structure --- wire electrical discharge grinding (WEDG) --- micromoulding --- soft microrobotics --- electrical discharge machining (EDM) --- Tungsten cemented carbide (WC-Co) --- desktop micro-electrical discharge machining (micro-EDM) system --- cut-side micro-tool --- micro-holes --- EDM --- SR --- TWR --- PMEDM --- MRR --- electro-discharge treatment --- Ti-6Al-4V --- MWCNTs --- surface characterization --- wear resistance --- corrosion resistance --- composite 3D microelectrode --- diffusion bonding --- step --- 3D microstructure --- material processing --- DSS-2205 alloy --- electric-discharge machining --- surface integrity --- surface wettability --- ceramic composite --- micro-EDM milling --- pulse discrimination --- Micro-electro-discharge machining (μEDM) --- liquid-metal electrode --- Galinstan --- Zirconium Boride --- silicon carbide fibers --- silicon carbide whiskers --- advanced material --- TiNi shape memory alloy --- TiC powder --- surface modification --- microhardness --- electrochemical discharge machining --- laser machining --- glass --- micro-groove --- n/a

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This book includes an editorial and 12 research papers on micromixers collected from the Special Issue published in Micromachines. The topics of the papers are focused on the design of micromixers, their fabrication, and their analysis. Some of them proposed novel micromixer designs. Most of them deal with passive micromixers, but two papers report studies on electrokinetic micromixers. Fully three-dimensional (3D) micromixers were investigated in some cases. One of the papers applied optimization techniques to the design of a 3D micromixer. A review paper is also included and reports a review of recently developed passive micromixers and a comparative analysis of 10 typical micromixers.

Technology: general issues --- passive micromixers --- comparative analysis --- Navier-Stokes equations --- mixing index --- pressure drop --- mixing cost --- micromachining --- micro EDM milling --- empirical modelling --- micromixer --- design for manufacturing --- computational fluid dynamics --- micromixers --- acoustic micromixers --- active micromixers --- electromagnetic micromixers --- voice-coil mixers --- mixers --- anti-reciprocity --- electrical impedance --- mechanical velocity --- gyrator --- electro-mechanical systems --- micro heat exchanger --- vortex shedding --- thermal mixing --- computational fluid dynamics (CFD) --- thermal engineering --- three-dimensional (3D) printing --- micronozzles --- Y-shaped structure --- mixing efficiency --- histogram and standard deviation --- split-and-recombine --- additive manufacturing --- surface metrology --- asymmetric split-and-recombine (ASAR) --- stereolithography --- surface roughness --- soft tooling --- centrifugal microfluidics --- U-shaped channel --- Coriolis force --- flow visualization --- microfluidics --- T-shaped micromixer --- vortex --- obstacles --- engulfment flow --- particle tracking --- electrokinetic vortices --- T-type microchannel --- zeta potential ratio --- length ratio --- Navier-Stokes equations --- optimization --- RBNN --- TLCCM configuration --- mixing rate --- kinematics --- deformation --- vorticity --- stretching --- folding --- diffusive mixing --- passive mixing --- fluid overlapping --- sequential injection --- segmentation --- concentric flow --- CFD --- passive micromixers --- comparative analysis --- Navier-Stokes equations --- mixing index --- pressure drop --- mixing cost --- micromachining --- micro EDM milling --- empirical modelling --- micromixer --- design for manufacturing --- computational fluid dynamics --- micromixers --- acoustic micromixers --- active micromixers --- electromagnetic micromixers --- voice-coil mixers --- mixers --- anti-reciprocity --- electrical impedance --- mechanical velocity --- gyrator --- electro-mechanical systems --- micro heat exchanger --- vortex shedding --- thermal mixing --- computational fluid dynamics (CFD) --- thermal engineering --- three-dimensional (3D) printing --- micronozzles --- Y-shaped structure --- mixing efficiency --- histogram and standard deviation --- split-and-recombine --- additive manufacturing --- surface metrology --- asymmetric split-and-recombine (ASAR) --- stereolithography --- surface roughness --- soft tooling --- centrifugal microfluidics --- U-shaped channel --- Coriolis force --- flow visualization --- microfluidics --- T-shaped micromixer --- vortex --- obstacles --- engulfment flow --- particle tracking --- electrokinetic vortices --- T-type microchannel --- zeta potential ratio --- length ratio --- Navier-Stokes equations --- optimization --- RBNN --- TLCCM configuration --- mixing rate --- kinematics --- deformation --- vorticity --- stretching --- folding --- diffusive mixing --- passive mixing --- fluid overlapping --- sequential injection --- segmentation --- concentric flow --- CFD