MULTI-MATERIAL OPTIMIZATION FOR 4D PRINTING OF ACTIVE ROD STRUCTURES

    公开(公告)号:US20190272346A1

    公开(公告)日:2019-09-05

    申请号:US16348505

    申请日:2017-11-10

    Abstract: A design optimization and manufacturing approach for the creation of complex 3D curved rod structures with spatially variable material distributions that exhibit active deformation behavior is provided. The framework optimizes the cross-sectional properties of a rod structure, in particular the Young's modulus, such that under given loading conditions the rod structure may obtain one or more target shapes resulting from geometrically nonlinear deformation, from which the structure can then actively deform back to the original shape due to the shape memory effect. A novel algorithm is provided to generate physical realizations from the computational design model, which allows their direct fabrication via printing of shape memory composites with voxel-level compositional control with a multi-material 3D printer. The design and manufacture digital toolchain allows the continuous variation of multiple active materials as a route to optimize mechanical as well as active behavior of a structure.

    PARTICLE MANIPULATION
    94.
    发明申请

    公开(公告)号:US20190160463A1

    公开(公告)日:2019-05-30

    申请号:US16091813

    申请日:2017-07-19

    Inventor: Ye Ai Zhichao Ma

    Abstract: The present invention relates to the manipulation and, more particularly, to the sorting of particles. Still more particularly, the present invention relates to the use of acoustic waves, including surface acoustic waves, for the manipulation and sorting of particles. In an example, the present invention may be used for the sorting of cells. In an aspect of the invention, there is provided a device for manipulating a particle in a fluid suspension, the device comprising: (a) a substrate having a surface; (b) an acoustic source configured to generate and deliver an acoustic wave within a region of the substrate surface; and (c) a pillar disposed on the surface of the substrate and the pillar is configured to receive a channel, the channel configured to receive the fluid suspension, wherein the acoustic wave delivered within the region of the substrate surface is delivered to the fluid suspension in the channel through the pillar. A method using the device of the invention is also disclosed.

    BORON REMOVAL AND MEASUREMENT IN AQUEOUS SOLUTIONS

    公开(公告)号:US20190009246A1

    公开(公告)日:2019-01-10

    申请号:US16062625

    申请日:2016-12-13

    Abstract: In one embodiment, the invention relates to a carbon-based boron removal medium with hydroxyl groups and amine group, and in particular, to a method for forming the carbon-based boron removal medium. In a specific embodiment, nitrogen-doped (“N-doped”) graphene oxide is synthesized by a simple two-step process: (1) oxidation of graphite to graphene oxide, and (2) nitrogen-doping (“N-doping”) the graphene oxide to form the amine group. The resultant N-doped graphene oxide can efficiently remove boron from aqueous solutions. In another embodiment, a method of sensing or detecting the presence of boron in an aqueous solution by using a boron sensing medium comprises at least two hydroxyl groups and at least one pyridinic nitrogen or pyrrolic nitrogen or quaternary nitrogen (i.e. pyridoxine, in particular vitamin B6). The boron ions in the solution would form a highly ionized complex, which can cause significant increase in electrical conductivity of the solution, which can then be used to measure the concentration of boron in said solution.

    MICROFLUIDIC PARTICLE MANIPULATION
    98.
    发明申请

    公开(公告)号:US20180369816A1

    公开(公告)日:2018-12-27

    申请号:US15775717

    申请日:2016-11-11

    Abstract: The present invention relates to the use of acoustic waves for the manipulation and sorting of particles and cells. In an embodiment, there is provided a microfluidic device for manipulating a particle in a fluid suspension, the device comprising: (a) a substrate; (b) a channel defined in the substrate, the channel having an inlet for receiving the fluid suspension and an outlet for discharging the fluid suspension; and (c) an acoustic source configured to deliver a travelling surface acoustic wave transverse the flow of the fluid suspension in the channel, wherein the acoustic source is an interdigital transducer (IDT), the IDT comprises a plurality of concentric circular arcs having a tapered end directed at the channel, and the tapered end has an aperture of between 4 μm and 150 μm. In an alternative embodiment, the device comprises a second channel disposed intermediate the first channel and the acoustic source wherein the first and second channels are connected by a pumping channel.

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