Schematic Title: Schematic Diagram of Microneedle Patch Preparation Process Overall Style and Layout: Style: Simple, modern, with technological line illustrations or flat vector graphics. Use a refreshing color scheme, mainly blue, gray, and white, with key parts highlighted in orange or green. Layout: A horizontal flowchart from left to right, including 4 core steps. Each step is clearly marked with a numbered module (Step 1-4). Detailed Description of Steps: Step 1: Mold Casting Scene: On the left is a transparent/translucent polymer microneedle mold (such as a PDMS mold), with a regularly arranged array of inverted pyramid or conical pits visible on its surface. Action: A pipette or dropper is dropping a drop of viscous, translucent mixed solution onto the surface of the mold. The solution can be symbolically dotted with tiny nanoparticles (NPs) to represent DNase-PDA@C-176 NPs. Label: Label the solution as "HA and DNase-PDA@C-176 NPs mixed solution". Label the mold as "Microneedle Mold". Step 2: Vacuum Filling Scene: The mold is placed in a transparent vacuum chamber. State: The solution on the surface of the mold has spread and covered the entire mold area. A vacuum pump icon (or a simple downward arrow indicating air extraction) is connected above the vacuum chamber. Key Visual: In the pits of the mold, use an enlarged partial cross-sectional view to show that the solution is being drawn down under the action of vacuum negative pressure, completely filling every tiny corner of the pit and expelling all air bubbles. A few small upward air bubble arrows can be used to indicate the dynamic process of exhaust. Label: "Vacuum Filling" or "Vacuum Degassing". Step 3: Drying and Curing Scene: The mold is transferred to a dry environment, such as being placed under a gentle warm air flow (indicated by curved arrows) or placed in a "drying oven" icon. State: The moisture in the solution in the mold evaporates, the volume shrinks, and finally solid needles are formed in the mold pits. A partial cross-sectional view can be used again to compare: from pits filled with liquid to solid needles. Label: "Drying/Curing". Step 4: Demolding and Finished Product Action: A hand or a robotic arm is carefully peeling/removing a formed microneedle patch substrate (a transparent polymer backing) from below. Finished Product Display: The peeled patch is displayed completely. Hundreds of tiny conical needle tips stand neatly on the patch substrate, forming a perfect array. Multi-angle Display (Optional): Main View: Complete patch. Side View/Magnified View: Shows the sharp needle tip and complete shape of a single microneedle, with dimensions labeled as "Height: 1000 μm, Base Width: 600 μm". Top View (Illustration): Shows the regular arrangement of microneedles, such as a "10x10 array" or similar. Final Label: Label the finished product as "DNase-PDA"
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