1. Junhua Wei
10932 Caminito Alvarez, San Diego, CA, 92126 • (312) 618-9755 • junhua.austin.wei@gmail.com
SUMMARY OF QUALIFICATIONS:
3 years of working experience in additive manufacturing: fused deposition modeling (FDM), syringe dispersing, and screen printing;
Excellent skills in designing and printing devices: Organic LED (OLED), strain sensor, thermoelectric generator (TEG), circuitry;
Deep understanding of the physics and chemistry of polymers and the dispersion of fillers;
Expert in preparing, printing, and solidifying liquid materials: liquid metal, solution, ionic, photo- and thermal curable ink/gel/paste;
EXPERIENCE:
Contractor, Graphene 3D lab Inc., Calverton, NY 07/2015 to now/2015
Building 3D Printers for solid/liquid materials
 A 3D printer was designed and built with an open platform to hold exchangeable deposition units and adapters were designed
and built to connect and control the spray deposition, syringe dispersing, inkjet printing, and FDM units by the printer;
 Commercial 3D printers were attached with syringe dispersing units to print both solid filament and liquid materials in sequence;
Printing electronic devices
 Ablinking cubic was designed and fabricated by soldering LED lights, batteries, and microcontroller onto a printed 3D circuitry;
 An OLED was printed layer-by-layer using ultrasonic spraying, syringe dispersing, vacuum pickup, and FDM units;
 A strain sensor, its resistance changed with the bending angle, was printed by dispersing silver ink onto a FDM printed sheet;
Preparing Conductive inks
 High conductive and stable silver/polymer solution was tested by the adhesion tape and used to print 2D patterns;
 AUV curable ink was prepared by mixing silver nanoparticles with thermal curable epoxy resin to print 3D electronic circuitry;
Research Assistant, Texas Tech University, Lubbock, TX 08/2011 to 06/2015
Printing Flexible TEGs
 A syringe dispersing 3D printer was built to fabricate TEGs by printing PEDOT and graphene inks onto a polyimide film;
 The graphene ink was prepared by dispersing nitrogen doped graphene and surfactant in solvent and cured by oven burning;
 The wettability of the polyimide film was optimized for printing by using plasma and chemical treatment;
3D Printing Meniscus Substitutes
 A syringe dispersing 3D printer with a heating pad wrapped steel syringe was built to print thermal sensitive hydrogel;
 A meniscus shaped hydrogel with high shape fidelity and compatible toughness was printed as the substitute;
 The hydrogel formulation and the printing parameters were optimized according to the ink’s rheological conditions;
Reinforcing Thermoplastic Filaments by Carbon Fiber
 By using thermoplastic filament reinforced by carbon fiber, mechanically improved structures were printed by FDM;
 Better filler-polymer interaction was achieved by surface oxidation of carbon fiber using chemical and ionic method;
 Thermoplastic was integrated with carbon fiber by solvent mixing and formed into filament by using an extruder;
Enhancing Rubber by Graphene
 Rubber was integrated with chemical modified graphene during thermal curing by covalently polymer-filler interaction;
 Rubber/graphene composites with better mechanical and barrier properties was produced by solvent than mechanical mixing.
TECHNICAL SKILLS:
Applications: Arduino, MATLAB, Simplified 3D, Kisslicer, Pronterface, gcode, Solidworks, AutoCAD, Inventor;
Characterization tools: HPLC, DLS, ODR, TEM, SEM, XRD, XPS, FTIR, AFM, TEM, DSC, TGA, and DMA;
Polymer composites preparation: solvent mixing, roll mill mixing, rheometer mixing, extruder, and melt mixing;
Thin film growth: spray coating, sputter coating, thermal evaporation, and spin coating.
EDUCATION:
Texas Tech University, Lubbock, TX Ph.D in Mechanical Engineering 08/2015
Illinois Institute of Technology, Chicago, IL ME in Mechanical Engineering 05/2011
Beihang University, Beijing, China BE in Mechanical Engineering 07/2009