Herein,
we present a facile reinforcement method for the large-scale
fabrication of highly flexible, mechanically stable, temperature-resistant
ceramic lightweight membranes based on the cross-linked assembly of
zirconia–silica (ZrO2–SiO2) nanofibrous
and montmorillonite (MMT) nanosheets through electrospinning and a
subsequent calcination process. The resulting MMT@ZrO2–SiO2 membranes exhibit high flexibility with a bending rigidity
of 0.2 cN mm–1, robust mechanical performance with
a tensile strength of up to 1.83 MPa, robust fire resistance, and
temperature-invariant mechanical stability from −196 to 1000
°C. The thermal superinsulation with a thermal conductivity as
low as 0.026 W m–1 K–1 and the
improved mechanical strength can be attributed to the cross-linked
interfacial interaction between the ZrO2–SiO2 nanofibers and the MMT nanosheets. Additionally, a firefighter
uniform with MMT@ZrO2–SiO2 membranes
inside features a superior thermal protective property up to the A2
level (combined flame and radiant exposure) and an excellent fire
resistance of up to 1000 °C, which is ideal for next-generation
firefighter uniform manufacturing.
Semi-one-pot synthesis of phenanthrenes from styrenes and arenes was developed through cross-dehydrogenative coupling. A sequence of Heck-type coupling and photo-cyclization were involved and a variety of functionalities were tolerated. This method provides an effective and practical protocol towards the synthesis of substituted phenanthrenes.
Soft robotic actuators offer many advantages over their rigid counterparts, but they often are unable to apply highly localized point loads. In contrast, many invertebrates have not only evolved extremely strong "hybrid appendages" that are composed of rigid ends that can grasp, puncture, and anchor into solid substrates, but they also are compliant and resilient, owing to the functionally graded architecture that integrates rigid termini with their flexible and highly extensible soft musculatures. Inspired by the design principles of these natural hybrid appendages, we demonstrate a synthetic hybrid end effector for soft-bodied robots that exhibits excellent piercing abilities. Through the incorporation of functionally graded interfaces, this design strategy minimizes stress concentrations at the junctions adjoining the fully rigid and soft components and optimizes the bending stiffness to effectively penetrate objects without interfacial failure under shear and compressive loading regimes. In this composite architecture, the radially aligned tooth-like elements apply balanced loads to maximize puncturing ability, resulting in the coordinated fracture of an object of interest.
A reconstruction algorithm for blade surface from less measured points of section curves is given based on B-spline surface interpolation. The less measured points are divided into different segments by the key geometric points and throat points which are defined according to design concepts. The segmentations are performed by different fitting algorithms with consideration of curvature continuity as their boundary condition to avoid flow disturbance. Finally, a high-quality reconstruction surface model is obtained by using the B-spline curve meshes constructed by paired points. The advantage of this algorithm is the simplicity and effectivity reconstruction of blade surface to ensure the aerodynamic performance. Moreover, the obtained paired points can be regarded as measured points to measure and reconstruct the blade surface directly. Experimental results show that the reconstruction blade surface is suitable for precisely representing blade, evaluating machining accuracy, and analyzing machining allowance.
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