Micromanufacturing by selective jet electrodeposition process

Rajput, Mridul Singh; Pandey, Pulak M.; Jha, Sunil

doi:10.1007/s00170-013-5470-3

Cited by 33 publications

(19 citation statements)

References 11 publications

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“…In highly curved regions, such as exist at edges, the specific density increases due to higher current densities. [36][37][38][39][40] Furthermore, the general homogeneity is also influenced by local differences in the electrolyte flow velocity. Areas with higher flow velocities have higher specific densities in the total volume.…”

Section: Discussionmentioning

confidence: 99%

“…It is noticeable in all four density distributions of Figure 2 that the highest density factors are always located at the outer region of the plates, which represents the edges of the disc-like foam plate where the current is applied during the electrodeposition. [36][37][38] To reduce this effect, the cathodic connection to the power supply can be accomplished via the center of the foam as seen in Figure 3c. Thus, the distribution of the density factor is homogenenized until minor deviations by a centralized current application.…”

Section: Global Coating Thickness Distribution: Gravimetrymentioning

confidence: 99%

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Investigation of the Structural Coating Homogeneity in Open‐Porous Nickel/Polyurethane Hybrid Foams Produced by Flow‐Controlled Electrodeposition

Kunz

Jung

2022

Adv Eng Mater

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In today's world, the saving of raw materials together with the reduction of emissions necessitates the development of new, customized and application‐oriented materials which fulfill various requirements at the same time. Metal foams achieve a high strength combined with low weight. The present work deals with a flow‐controlled production technique for hybrid foams to deposit a nanocrystalline nickel (Ni) layer on pre‐treated, open‐porous polyurethane (PU) foams. The analysis of the resulting coating thickness distributions with gravimetric and microscopic methods shows the qualitative and quantitative influences on the local deposition by varying the process parameters. For the first time, the coating thickness distribution of Ni/PU hybrid foams is investigated regarding the analysis of a global and local homogeneity. The comparison of experimental data with simulated flow velocity profiles leads to an estimation of the correlation between flow velocity, anode distance, and coating thickness distribution, which represents the mass transport. The correlations show, that the coating process is strongly controlled by the electrolyte's flow velocity as well as the distribution of the electric field.

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Section: Discussionmentioning

confidence: 99%

Section: Global Coating Thickness Distribution: Gravimetrymentioning

confidence: 99%

Investigation of the Structural Coating Homogeneity in Open‐Porous Nickel/Polyurethane Hybrid Foams Produced by Flow‐Controlled Electrodeposition

Kunz

Jung

2022

Adv Eng Mater

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“…For the purpose of protein applications, mesoporous (2-50 nm) silica has some excellent properties with high surface adsorption capacities for a large number of bioactive substances [14][15][16][17]. Moreover, ordered mesoporous structures have proved to be effective support carriers because of excellent adsorption properties, a high specific surface area and porosity, tunable pore size with narrow distribution, biocompatibility, easy functionalization [18][19][20][21][22].…”

Section: Role Of Nanoparticles In Protein Extraction Of Paint Model Microsamplesmentioning

confidence: 99%

Optimization of protein extraction and ELISA immunodetection from protein-based paint models with mesoporous silica nanoparticles and MCM41

et al. 2021

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Protein-based biological materials such as albumin, casein and collagen are found in various cultural heritage (CH) artefacts. This study focuses on the study of protein binders from easel paintings media. Proteins have complex structures which are difficult to identify with non-invasive spectroscopic methods (FT-IR, Raman, UV). Immunoassays such as ELISA determine the protein’s source of origin which is necessary for art objects. To increase the detection and identification of proteins by immunoassays, the efficiency of micro-extraction of proteins from heritage materials is a crucial step. Extractions mediated by cycles of orbital agitation and ultrasonic radiation give the possibility to extract proteins from easel painting sample. In this work, protein-based paint models coupled with silica nanoparticles were used for micro-extraction. Nanoparticles possess high surface-to-volume ratios that can attach bioactive molecules such as proteins and increase the total protein recovered from microsamples. Protein extracts were quantified with Bradford Assay in the presence of Coomassie blue. The protein recovery results were statistically computed, and the SPSS analysis shows significant (p < 0.05) increase in protein recovery, above 1.3 times for NPSiO2 and above 1.6 times for MCM-41. The statistical data shows evidence that silica nanoparticles intensify the total protein recovered from paint microsamples. Finally, ELISA was realized on the protein extracts to verify and compare the immunodetection of protein from the paint models with and without the use of silica nanoparticles.

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“…For instance, the micro-and nano-springs used in MEMS [7,8], high-frequency antennas [9], and high-performance sensors [10] should have a high elastic modulus and elastic energy storage, but inferior manufacturing accuracy and poor surface morphology significantly limit their performance and application. In general, prevailing quality issues with microstructures are due to nonuniform profiles and coarse surface morphology [11], which form during manufacture due to the size and complex shape of the micro-and nano-features of the microstructures. Until manufacturing methods with high dimensional accuracy and good surface quality are developed for micro-components, it will be impossible to utilize fully the advantages of surface microstructures.…”

Section: Introductionmentioning

confidence: 99%

Hybrid electrochemical additive and subtractive manufacturing (HEASM) based on simultaneous mask electrochemical deposition and dissolution

Yang

Zhang

Zhao

et al. 2022

Int J Adv Manuf Technol

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This paper proposed a method for hybrid electrochemical additive and subtractive manufacturing (HEASM) to fabricate microstructures with high dimensional accuracy and good surface quality. Electrochemical additive manufacturing is achieved by applying positive pulses between the electrodes and then negative pulses are subsequently applied to achieve electrochemical finishing of the shape and surface. In this study, the formation of irregular surface defects was investigated, and a verification experiment was carried out. The inter-electrode pulse waveform and machining process were observed to characterize the electrochemical deposition and dissolution machining. The effects of pure electrodeposition, HEASM, and excessive electrolysis on the surface morphology were compared experimentally. The results indicate that HEASM can reduce the surface roughness by 45.5% but excessive electrolysis can cause a collapse of edge regions. Finally, Taguchi optimization experiments were carried out, and an optimized parameter combination for HEASM was obtained. A microstructure manufactured with an optimized pulse number ratio 0.6 × 10 −2 , peak current ratio 0.5, and pulse width ratio 1.0 had the best surface morphology and dimensional accuracy. And its surface roughness and height were 0.343 μm and 33.563 μm, respectively.

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Micromanufacturing by selective jet electrodeposition process

Cited by 33 publications

References 11 publications

Investigation of the Structural Coating Homogeneity in Open‐Porous Nickel/Polyurethane Hybrid Foams Produced by Flow‐Controlled Electrodeposition

Investigation of the Structural Coating Homogeneity in Open‐Porous Nickel/Polyurethane Hybrid Foams Produced by Flow‐Controlled Electrodeposition

Optimization of protein extraction and ELISA immunodetection from protein-based paint models with mesoporous silica nanoparticles and MCM41

Hybrid electrochemical additive and subtractive manufacturing (HEASM) based on simultaneous mask electrochemical deposition and dissolution

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