{"id":75,"date":"2021-04-05T11:44:33","date_gmt":"2021-04-05T15:44:33","guid":{"rendered":"https:\/\/seniordesign.digitalscholar.rochester.edu\/bme2021\/?p=75"},"modified":"2022-04-13T10:07:50","modified_gmt":"2022-04-13T14:07:50","slug":"droplet-placement-positioning-system-for-fluid-deposition","status":"publish","type":"post","link":"https:\/\/www.hajim.rochester.edu\/senior-design-day\/droplet-placement-positioning-system-for-fluid-deposition\/","title":{"rendered":"Droplet Placement Positioning System for Fluid Deposition"},"content":{"rendered":"\n
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Group Members <\/h4>\n\n\n\n

Elizabeth Rath
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Anthony Gurunian
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Yiyun Wang
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Andrew Weber<\/td>
Nathan  Pinnette<\/td><\/tr><\/tbody>
erath@u.rochester.edu<\/sup><\/td>agurunia@u.rochester.edu<\/sub><\/td>ywang251@u.rochester.edu<\/sub><\/td>aweber12@u.rochester.edu<\/sub><\/td>npinnett@u.rochester.edu<\/sub><\/td><\/tr><\/tfoot><\/table><\/figure>\n\n\n\n

Problem Statement<\/strong><\/h3>\n\n\n\n
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The motivation for this project is the need for precise polymer deposition on Waveguide Enhanced Raman Spectroscopy Sensors (WERS). Focusing on achieving a 100\u03bcm resolution of the polymer deposition and control of the z-axis will allow researchers to accurately and precisely deposit aqueous fluids on these sensors or on other small, high-precision devices. <\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n

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Customer Needs<\/h3>\n\n\n\n
  • Product needs to be able to place polymer solutions on a small chip. <\/li>
  • Resolution of 100\u03bcm<\/li>
  • Precise X, Y, and Z axis control.<\/li>
  • Design compatibility with aqueous solutions and varying types of alcohols. <\/li>
  • Product that can place the polymers on the chips through adhesion forces rather than mechanical forces.<\/li>
  • Level printing surface<\/li>
  • Fluid deposition volume accuracy<\/li><\/ul>\n<\/div>\n\n\n\n
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    Customer Wants<\/h3>\n\n\n\n
    • Does not need to be fast, but could be relatively quick in future designs. Approximately 20-40 mm\/s linear travel speed would be ideal. <\/li>
    • Minimal waste of fluid<\/li>
    • 10 cm2<\/sup> printing surface<\/li>
    • Syringe mounted directly above where it is dispensed.<\/li>
    • Resolution of 10um in future designs<\/li>
    • Climate control within the device<\/li><\/ul>\n<\/div>\n<\/div>\n\n\n\n

      Prototyping<\/h3>\n\n\n\n
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      Prototype 1 – z-axis moving <\/summary>
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      Prototype 1: Too complex and too much fluid wasted. <\/strong>This prototype tested a fluid deposition surface that doesn\u2019t move side to side. In this design, the fluid deposition plate would move along the z-axis. This prototype tested a timing belt and pulley system for controlling the axes. Also, for this design, the syringe pump was not directly connected to the device. Instead, the syringe pump was off to the side and connected by a long flexible tube.<\/p>\n<\/div><\/div>\n<\/div><\/details><\/div>\n\n\n\n

      Prototype 2 – Stationary Fluid Deposition Surface<\/summary>
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      Prototype 2: Too complex and time inefficient.<\/strong> This prototype tested a design with a completely stationary fluid deposition surface. Very complex: z-axis is connected to the x-axis which is connected to the y-axis. This prototype would have the syringe pump directly connected to the device. This prototype also tested a timing belt system for controlling the axes. We determined from this prototype that we would be better off spending our time modifying a 3D printer or CNC machine instead of designing everything from scratch.<\/p>\n<\/div><\/div>\n<\/div><\/details><\/div>\n\n\n\n

      Prototype 3 – Final Design <\/summary>
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      Prototype 3: Simple and time-efficient. <\/strong>For this prototype, we modified a CNC machine. This prototype is designed such that the fluid deposition plate moves along the y-axis. This prototype uses a lead-screw design for controlling the axes. Also, this prototype tested a lighter fluid deposition surface and a spring leveling system for each corner of the fluid deposition surface.<\/p>\n<\/div><\/div>\n<\/div><\/details><\/div>\n<\/div>\n\n\n\n

      Testing results<\/h3>\n\n\n\n
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      Resolution Testing<\/h6>\n\n\n\n