New Ursane Glycoside from the Roots of Asparagus racemosus

conductivity and immunity to deformations, as well as a robust interface between them for long-term usage. In addition, a facile, cost-effective, and eco-friendly fabrication method is highly desirable for the whole flexible sensor.Among a variety of fabrication methods reported so far, lithography, [16][17][18][19] screen printing, [20][21][22][23][24] inkjet printing, [25][26][27][28][29] and electroless deposition, [30,31] are widely used in flexible sensor fabrication. However these 2D fabrication methods only can fabricate flexible sensor on a flat plane. 3D printing, also called additive manufacturing, provides a rapid prototyping strategy for industrial design, architecture, aerospace, dental and medical industries, and other fields. [32] Due to the ability to fabricate components and structures rapidly, cost-efficiently, and environmentally, in recent years, 3D printing has been explored for the fabrication of flexible sensor for electronics. [33] Up to now, 3D printing technologies used in the fabrication of flexible sensor include fused deposition modeling (FDM), [34][35][36][37][38] direct ink writing (DIW), [39][40][41] and digital light processing (DLP). [42][43][44][45] Li et al. developed a FDM-3D printed flexible strain sensor based on carbon black/thermoplastic polyurethane, and periodic configurations were designed to improve the flexibility of sensing unit. [46] Hensleigh and coworkers fabricated a flexible 3D capacitive sensor based on multi-material DIW-3D printing, which can be integrated into prosthetic and soft robotic. [47] Despite of these successful studies, extrusion-based 3D printing techniques typically suffer from limited raw materials, easy clogging of the needles, and nonuniformity of the printed layers. [48] The stereolithography-based 3D printing technique, DLP-3D printing, relying on layer-by-layer curing of photocurable resin, has high resolution, simple process, and fast forming speed. Technically, DLP 3D printing of flexible sensor can be divided into two routes. The first one is to 3D printing of molds or substrates, then active components are filled into the molds or deposited on the substrates to form flexible sensors. For instance, Wu's group report a flexible pressure sensor with porous structure used DLP-3D printed hydrolysable scaffold as sacrificial mold which need to be dissolved to create the porous structure for sensing unit after curing the conductive polymer composites. [49] Xia and coworkers fabricated a flexible pressure sensor by 3D-printing of microstructured substrate with gold film spray-coated on it. [50] The second route for DLP-3D Flexible sensor with high sensitivity, high durability, and facile fabrication process has promising applications in structural health monitoring, humanmachine interface, and soft robotics areas. Digital light processing-3D (DLP-3D) printing can print flexible sensor in a scalable process. However, to achieve all DLP-3D printing of flexible sensor, there still exist challenges of how to print sensing units with high sensitivit...

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Morphology and size effects on the reduction of silver oxide by hydrogen

Schimo

Kreuzer

Hassel

2015

Physica Status Solidi (a)

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The dependence of reactivity towards hydrogen on size and morphology was studied for silver oxide Ag2O microparticles. Morphological tuning of the microparticles, which appeared in a size range from 340 to 1400 nm, was achieved in a wet‐chemical synthesis approach. Thermogravimetric measurements allowed the determination of onset temperatures and reaction rates for reduction with gaseous hydrogen as reducing agent. The results reveal the high complexity of the Ag2O reduction process, on which both the surface to volume ratio as well as the facet dependent activity of the morphologies have great influence. Differential scanning calorimetry was employed to study reduction by hydrogen, desorbing from a hydrogen‐loaded palladium foil, showing great effect of contact area size on the reactivity.

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New Ursane Glycoside from the Roots of Asparagus racemosus

Cited by 9 publications

References 14 publications

Multilevel topological description of molecular packings in 1,2-benzothiazines

Multilevel topological description of molecular packings in 1,2-benzothiazines

All Digital Light Processing‐3D Printing of Flexible Sensor

Morphology and size effects on the reduction of silver oxide by hydrogen

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