• Name: Dana Ung
• Email: danaung@stanford.edu
• Company Name: Stanford SURF
• Company URL: http://bdml.stanford.edu
• Location: BDML
• Country: USA
• Comment: Undergraduate Researcher
• Other Topics:
  • DanaSummerTwiki: Twiki of Summer Work
  • DanaContacts: List of contacts

Objective: Produce a 1cm x 1cm square of nanohairs
Running List of objectives:

• Bond hairs from Cal to a substrate
  • Cast Hairs
    1. Test the bonding between polyamide hairs on a polyamide substrate and a polyurethane substrate
    2. Test the bonding between polyamide hairs (without a polyamide substrate) and a polyurethane substrate
    3. Test the feasibility of casting polyurethane in polycarbonate filters so the polyurethane hairs and substrate are one piece
  • Test the bonding between polyurethane and polyamide
  • Test different solvents and their effects on polyurethanes
  • Test solvents' ability to dissolve polycarbonate filters
  • Procure materials:
    • Solvents
      • Methylene Chloride, Dimethyformamide, Trichloroethane, Cyclohexane, Acetone, Benzene
    • Polycarbonate nanofilters
      • 2um filters so they can be seen under an optical microscope
      • 0.4um filters for functionality
    • Polyamide
    • Polyimide
    • Non-stick release films?
• Dendritic Growth as a possibility?

Objective: Prepare for a visit to Kellar Autumn's Lab - Go in Spring

• Get an idea of what the Robotoe Setup is like
  • Ranges, parameters, etc.

03/11/05

03/04/05

• Completed online safety training courses for the MERL cleanroom
• Etched casted filters in methylene chloride

02/25/05

• Casted second batch of 1.2um filters in 90A and in marine epoxy
• Got mylar release film and marine epoxy from tap Plastic

02/18/05

• Etched casted hairs in methylene chloride
• Unsuccessful etching

02/11/05

• Casted first batch of 1.2um filters in 70A
• Got methylene chloride from the chemistry store

02/04/05

01/28/05

• Polycarbonate filter order
  • 13mm, 2.0um pores are out of stock - ordered 1.2um pores and 0.4um pores
  • 1.2um pores are coming next week and 0.4um pores are coming in 2 weeks
• Set up the use of a strong optical microscope (500x) for next week
  • Contact: Vikram Mukdan at Pruitt's lab
• Spin Coater
  • Refining the use of a spin coater in the polyurethane hair casting process
  • Contact: Eerik Hantsoo at Pruitt's lab
• Methylene chloride
  • Getting solvent disposal equipment
  • Looking into necessary safety-related issues

01/21/04

• Ordered 13mm diameter polycarbonate filters with 0.4um and 2.0um diameter pores.
  • http://www.fishersci.com
  • "Millipore* Isopore* Polycarbonate Membrane Filters"
• Researched solvents for polycarbonate

01/14/04

• Talked to Moto
• Set up Chem Store Account
• Talked to Rick Groff
  • Switched from Alumina filters to Polycarbonate filters
• Talked to Tim Kelly at Lewis and Clark
  • Projects going on at the lab
• Spoke to Professor Dave Barnett about possibly using dendritic growth to grow hairs...

12/10/04

• Removed the sample fom the NaOH solution and rinsed it with water
• Looked at 3 samples under the microscope: Sample 1 (90A) from 11/26, Sample 2 (20A) from 12/10, and uncasted samples
• Results and Picutures: EmbeddedAdhesive

12/09/04

• Cleaned up unsuccessful casting of 90A parts for the elongation test
  • Unsuccessful casting may have been due to improper hardener/ resin ratio
• Cleaned the Haas Machine
• Procured NaOH
• Mixed NaOH in hot water to make a 1 molar solution (following the same procedures as Documentation-EcthingFilters.doc)

12/07/04

• Casted 90A in parts for elongation test
• Cofabricated 5 half-filters.
• Met with Moto

11/26-27/04

• Mixed KOH in hot water to make a 1 molar solution
• Submerged the embedded filter in the solution
• Waited for 12 hrs
• Removed the sample fom the KOH solution and rinsed it with water
• Experiment Page: EmbeddedAdhesive
• Documentation-EcthingFilters.doc

11/24/04

• Procured pellets of KOH

11/19/04

• Met with Moto
• Experimenting with filters
  • Embedded half of a filter in 90A
  • Experiment Page: EmbeddedAdhesive
  • Documentation-EcthingFilters.doc

11/12/04

• Spoke to Will about SU8
• SU 8 BG Research

11/05/04

• Visited the PolyPEDAL Lab at Berekely w/ Moto and Miguel
  • Spoke to Professor Full and Rick Groff
  • Looked at current hair manufacturing progress
  • Talked about future steps

10/29/04

• Analyzing current foot designs on Twiki
• Brainstorming ideas for cofabrication
• Background research

10/22/04

• Background research

10/19/04

• Met with Moto - checkup on research progress

10/15/04

• Met with Moto - made a tentative schedule of research for the quarter
  • Week 4/5 - Background research
  • Week 6 - Analyze current foot designs
  • Week 7/8/9 - Designing and prototyping for cofabrication

10/11/01 - Monday

• Spoke to Mark about research
• Submitted Faculty Grant Proposal

Related topics

• DanaJiSchedule
• DanaAndJiExperiments
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• WebPreferences has preferences of the TWiki .Rise web.
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