Advanced Materials最新文献

Novel Ternary Intermetallics

In their Research Article (DOI: 10.1002/adma.202308168), Matheus A. Tunes, Konstantina Lambrinou, and co-workers introduce the ZIP phases – a new family of ternary intermetallics with two structural variants: one fcc (space group Fdm) and one hexagonal (space group P63/mmc). Atomically resolved images and crystal structure schematics of the two Nb-Si-Ni ZIP phases are pasted on the yin-yang symbol of duality. The advent of the ZIP phases creates a new ecosystem of nanostructured solids and potential 2D derivatives with properties unlike those achieved by related solids (e.g., MAX phases/MXenes). Background image: Courtesy NASA.

Hydrogel-Based Vat Photopolymerization

The image is an optical micrograph of a cross-section of a 3D-printed copper-hydrogel composite pillar. It shows the in-situ growth of copper within the hydrogels, highlighting the core mechanism of the infusion-precipitation process that transforms soft hydrogel into dense ceramics and metals. More details can be found in the Research Article by Daryl W. Yee and co-workers (DOI: 10.1002/adma.202504951).

Conventional blue fluorescent emitters suffer from low efficiency and broad full width at half maximum (FWHM), limiting their application in next-generation organic light-emitting diodes (OLEDs). In this work, we report a novel double boron-based multi-resonance-type blue fluorescent emitter, v-DABNA-BT by incorporating a benzo[b]thiophene unit into the v-DABNA core to address the efficiency and color purity issues of the blue OLEDs. The v-DABNA-BT exhibited deep blue emission with a photoluminescence peak at 466 nm and an exceptionally narrow FWHM of 13.9 nm. As a pure blue fluorescent emitter, it delivered a high external quantum efficiency of 10.8%, FWHM of 15.6 nm, and color coordinate of (0.115, 0.138). In addition, the v-DABNA-BT-based hyperfluorescent (HF) OLEDs achieved a maximum external quantum efficiency of 28.7% with a FWHM of 18.2 nm, one of the best performances reported among HF systems employing pure fluorescent terminal emitters. This result underscores the potential of benzo[b] thiophene-modified boron-based MR-type fluorescent emitters as promising candidates for high-efficiency, high-color-purity OLED applications.

The dynamic lubrication of sheath surrounding the tendon is significant to the motion of limbs. The sheath-inspired hydrogels for soft actuator and transplantable substitutes primarily focus on high toughness and intrinsic lubricating ability, it remains a significant challenge to design the hydrogels with secreting lubricants capability for continuous lubrication like sheath. In this work, a sheath-inspired semi-convertible hydrogel is designed by cooperating responsive supramolecular networks (gelatin and polydopamine particles) into covalent polymer network (polyvinyl alcohol/poly(N-isopropylacrylamide)). The interpenetrating covalent networks provide the high mechanical strength of 1.73 MPa and reversible contracting capability. The non-covalent disassembly of gelatin network under near-infrared light irradiation endows photothermal-responsive dynamic lubricating function, which could reach superlubricity level (coefficient of friction of 0.007) by introducing hydrophosphatidylcholine in the hydrogel. The synergy of well-lubricating capability and mechanical property of the hydrogel endows excellent durable property, which presents well elasticity after 15 000 compression cycles; and extreme low wear even after 100 000 shearing cycles. The developed hydrogel in this work is further processed into smart lubrication platform and photothermal regulation switch, which can broaden the application of smart responsive and interfacial lubricating materials.