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Design and direct additive manufacturing of three-dimensional surface micro-structures using material jetting technologies
摘要： The ability to directly print 3D microstructures across the surface of large dimension substrates opens up numerous possibilities not feasible with conventional 2D or 2.5D printing or coating techniques. Demonstrated herein is a method to print 3D microstructures onto clear poly(methyl methacrylate) (PMMA) plates using material jetting technologies. Contact angle and profilometry analysis indicated that the VeroCyan? photopolymer had enhanced wetting of the PMMA surface leading to greater droplet spreading affecting the geometries printed compared to VeroCyanTM integrated models. Strategies to manipulate the interfacial interactions and hence adhesion of the VeroCyan? photopolymer were investigated by varying PMMA surface free energy through physio-chemical and chemical techniques including (i) corona discharge, followed by post-treatments with 3-(trimethoxysilyl)propyl methacrylate, polyethyleneimine graft chemicals, and (ii) plasma treatments with air and plasma polymerisation of 1,7-octadiene. The surface chemistry and wetting behaviour played a crucial role in influencing interfacial interactions with the VeroCyan? photopolymer hence its adhesion to the PMMA surface.
关键词： surface chemistry,material jetting,interfacial interactions,Additive manufacturing,adhesion
更新于2025-09-19 17:15:36
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Dopant‐Free Hole Transporting Molecules for Highly Efficient Perovskite Photovoltaic with Strong Interfacial Interaction
摘要： One of the attractive ways to develop efficient and cost-effective inverted perovskite solar cells (PVSCs) is through the use of dopant-free hole transporting materials (HTMs) with facile synthesis and a lower price tag. Herein, two organic small molecules with a fluorene core are presented as dopant-free HTMs in inverted PVSCs, namely, FB-OMeTPA and FT-OMeTPA. The two molecules are designed in such a way they differ by replacing one of the benzene rings (FB-OMeTPA) with thiophene (FT-OMeTPA), which leads to a significantly improved coplanarity as manifested in the redshift of the absorbance and a smaller bandgap energy. Density functional theory calculations show that FT-OMeTPA has a strong Pb2+–S interaction at the FT-OMeTPA/perovskite interface, allowing surface passivation and facilitating charge transfer across interfaces. As a result, the PVSCs based on FT-OMeTPA exhibit a much higher hole mobility, power conversion efficiency, operational stability, and less hysteresis as compared with devices based on FB-OMeTPA.
关键词： hole transporting materials,dopant-free,p-i-n,inverted perovskite photovoltaics,interfacial interactions
更新于2025-09-19 17:13:59
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The Influence of the V2O5 · GeO2 Glass Phase on the Properties of AgI Nanolayers
摘要： Using X-ray phase analysis and impedance monitoring, it was shown that for a nanolayered structure, softened glass (V2O5 ? GeO2) can take an imprint from AgI lattice and retain it while being cooled to temperatures below Tg.
关键词： nanolayers,solid electrolytes,phase transitions,interfacial interactions,ionic conductivity
更新于2025-09-10 09:29:36