Johnson To

Johnson To

I study chemical engineering at UC Berkeley. This summer I was an R&D engineering intern at Delphon Industries, working on high-temperature silicone films for electrostatic discharge protection.

Outside of class I build things, like a waste bin that sorts itself with computer vision and an electrolysis cell for measuring hydrogen yield.

See my projects View resume
B.S. Chemical EngineeringUC Berkeley
Expected graduationMay 2029
Based inBerkeley, CA
Portrait of Johnson To in a suit on the UC Berkeley campus

Selected projects

All projects
  • The finished smart waste sorter: a wood and polycarbonate enclosure with two openings

    Smart Waste Sorting System

    Team project (14 members), January to May 2026

    Up to 95% confidence classifying trash vs. recycling

    View project site
  • Electrolysis setup: a DC power supply reading 4.0 V wired to graphite electrodes in a beaker of electrolyte, with collection tubes over each electrode

    Hydrogen Electrolysis Optimization

    Personal project, January to May 2026

    Up to 88% Faradaic efficiency across 18 timed trials

    View project site
  • Titration curve of ibuprofen with sodium hydroxide Modeled pH versus volume of 0.100 M NaOH added to 200 mg of ibuprofen. The pH starts near 3, rises slowly through a buffer region, equals the pKa of about 4.9 at the half-equivalence point near 4.8 mL, then jumps sharply at the equivalence point near 9.7 mL, where the pH is about 8.7. Ibuprofen + 0.100 M NaOH (modeled curve) 246810120481216 NaOH added (mL) pH pH = pKa ≈ 4.9 Equivalence point, 9.7 mL

    Ibuprofen Concentration and Degradation Analysis

    Chemistry lab project (team of 4), January to May 2026

    Measured how UV and heat exposure affect ibuprofen content in commercial tablets

    Read more
  • First page of the formal lab report on identifying an unknown weak acid

    Identifying an Unknown Weak Acid

    Formal lab report, written in LaTeX

    Identified the unknown as mandelic acid from its molar mass and pKa

    Read the report (PDF)

Experience

Full resume
June to August 2026
Hayward, CA

Research & Development Engineering Intern

Delphon Industries

  • Led a high-temperature ESD film project for semiconductor customers, formulating 10 silicone/CNT blends (107 to 1011 Ω/sq) and scaling them from 20 g batches to 25–50 kg on a cleanroom coating line.
  • Characterized films with 231 tack tests, 88 Zygo, SEM, and optical scans, and a 28-day 150 °C shelf-life study; helped root-cause two production defects.
  • Presented results to R&D leads, the CEO, and the CFO, after which the company increased project funding.