Effect of various dispersing agents on the stability of silver microparticle dispersion and the formulation of uniform silver film by laser melting

Letzel, Alexander; Maurer, Elisabeth; Meixner, Melanie; Poprawe, Reinhart; Stollenwerk, Jochen; Hessner, Sebastian; Lehmann, Kathrin; Gökce, Bilal; Barcikowski, Stephan

doi:10.2351/1.4955011

Cited by 8 publications

(7 citation statements)

References 16 publications

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“…The conductive materials and curing technology are very important to conductive ink (Letzel et al 2016). In the past, the use of conductive filler (metallic metal micronsized particles (Li et al 2014) was very common.…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles with Glucose for Conductivity Enhancement of Conductive Ink

et al. 2016

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a This work reported a green method of synthesizing silver nanoparticles (AgNPs) with glucose acting as reducing agents to improve the conductivity of conductive ink. Silver nitrate, glucose, and polyvinylpyrrolidone (PVP), were used as silver precursor, reducing agent, and capping agent, respectively. The optimal condition of synthesizing AgNPs was obtained by varying the reactant ratio and temperature. The AgNPs were characterized by X-ray diffraction (XRD), UV-visible spectroscopy (UV-Vis), and scanning electron microscope (SEM). The obtained AgNPs with diameters of 80 to 100 nm were almost spherical and they were redispersed well in polyurethane acrylate (PUA). Compared with traditional hydrazine hydrate, the prepared AgNPs were better with respect to uniform size, dispersion, stability, and the absence residual solvent. After UV sintering, the conductivity (2.3×10 5 S/m) and mechanical properties of prepared conductive ink were good. Therefore, using glucose as a reducing agent to prepare AgNPs conductive ink is feasible and noteworthy because it is an extremely common material.

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Section: Introductionmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles with Glucose for Conductivity Enhancement of Conductive Ink

et al. 2016

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“…They may cause unwanted balling effects during processing, as has been shown for laser direct-writing of stabilizer-containing Ag microparticle inks [23], which should be avoided during processing. Detailed information on the NPs' production can be found in the method part.…”

Section: Feedstock Modificationmentioning

confidence: 99%

Influence of colloidal surface-additivation with low melting point metal nanoparticles on Nd-Fe-B permanent magnets produced by suction casting

Liu,

Yang,

Staab

et al. 2023

Preprint

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The development of new powder feedstocks using nanoparticles (NPs) has the potential to enhance the functionality of as-built parts and overcome the limitations of current additive manufacturing (AM) techniques. This study investigated the impact of NP feedstock modification on the microstructure and functionality of MQP-S after suction casting. Two types of NPs, Ag, and ZrB2, were used, and their effects on grain size distribution and dendritic structure were evaluated. Ag NPs resulted in smaller, more uniform grain sizes and increased functionality, but only for loadings > 0.5 monolayers. ZrB2 resulted in uniformly distributed grain sizes at much lower mass loadings, with even more compact dendritic arms. However, no effect on functionality was observed. The results show that feedstock modification with low melting point metal NPs can improve the microstructure and magnetic properties of permanent magnets produced by AM and highlight the potential of using NPs to develop new powder feedstocks for AM. With this, it provides insights for future research on optimizing AM processes.

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“…[32,33] Moreover, organic residuals or colloidal stabilizers bear the risk of creating gases by laser vaporization and may cause unwanted balling effects, as has been shown for laser direct-writing of stabilizer-containing Ag microparticle inks. [34] Unlike wet chemical methods, laser ablation in liquids (LAL) does neither require chemical precursors nor organic surfactants. [35] The pulsed laser system is focused on a solid metal target submerged in liquids removing material from the target surface with the removed material being collected in the surrounding liquid forming a colloidal dispersion of NPs.…”

Section: Introductionmentioning

confidence: 99%

Influence of silver nanoparticle additivation on Nd-Fe-B permanent magnets produced by Laser Powder Bed Fusion

Gabriel

Liu

Staab

et al. 2023

Preprint

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Powder bed fusion of metals using a laser beam (PBF-LB/M) is an established additive manufacturing (AM) method that can be used to fabricate geometrically complex NdFe-B magnets. However, the magnetic properties of Nd-Fe-B magnets manufactured by PBF-LB/M are typically inferior to conventionally produced magnets. To overcome this drawback, we modified the surface of the permanent magnet feedstock powder with 1 wt.% surfactant-free Ag nanoparticles (NPs) supporting the formation of relevant phases required for permanent magnetic performance to achieve a suitable micro- and nanostructure after AM. Our study is accompanied by finite element simulations, revealing the impact and dependency of process parameters during PBF-LB/M: a wide temperature field with a high-gradient profile in the front and on the bottom of an overheated region, implying a vast local heating/cooling rate and in-process high thermal stress. We found experimentally that the as-built part density can be affected by both the laser power and scan speed, causing a reduction in density as both parameters increase. The functionality and microstructural properties are also investigated via VSM, HR-SEM, EDX, EBSD, and exemplarily with HR-TEM-EDX and APT. Our study found that modifying MQP-S with Ag NPs increases the coercivity by approximately 20%, which we correlate to a decreased grain size. Additionally, we identified three distinct phases in the modified and unmodified samples, where Ag is primarily found in the intergranular and Nd-rich phases of the as-built parts. Overall, the study's findings contribute to the understanding of the factors that affect the quality and magnetic properties of Nd-Fe-B magnets fabricated through PBF-LB/M and provide valuable insights for further research in this area.

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Effect of various dispersing agents on the stability of silver microparticle dispersion and the formulation of uniform silver film by laser melting

Cited by 8 publications

References 16 publications

Green Synthesis of Silver Nanoparticles with Glucose for Conductivity Enhancement of Conductive Ink

Green Synthesis of Silver Nanoparticles with Glucose for Conductivity Enhancement of Conductive Ink

Influence of colloidal surface-additivation with low melting point metal nanoparticles on Nd-Fe-B permanent magnets produced by suction casting

Influence of silver nanoparticle additivation on Nd-Fe-B permanent magnets produced by Laser Powder Bed Fusion

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