A tool for studying contact electrification in systems comprising metals and insulating polymers

Analytical Chemistry

Volumn 75, Issue 18, 2003, Pages 4859-4867

  Wiles, Jason A ^a   Grzybowski, Bartosz A ^a   Winkleman, Adam ^a   Whitesides, George M ^a  

^a HARVARD UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ELECTRIFICATION;

ELECTRICITY; ENZYME KINETICS; FERROMAGNETIC MATERIALS; PLASTIC FILMS; SURFACE CHEMISTRY;

POLYMERS;

FERROMAGNETIC MATERIAL; METAL; POLYMER;

ANALYTIC METHOD; ARTICLE; CHEMICAL ANALYSIS; CHEMICAL MODIFICATION; CHEMICAL REACTION KINETICS; ELECTRODE; FILM; MEASUREMENT; PHASE SEPARATION; POLYMERIZATION; SURFACE PROPERTY;

EID: 0141705528     PISSN: 00032700     EISSN: None     Source Type: Journal    
DOI: 10.1021/ac034275j     Document Type: Article

References (43)

1. Horn, R. G.; Smith, D. T.; Grabbe, A. Nature 1993, 366, 442-443.
2. Horn, R. G.; Smith, D. T. Science 1992, 256, 362-364.
3. Harper, W. R. Contact and Frictional Electrification; Laplacian Press: Morgan Hill, CA, 1998.
4. Moore, A. D. Electrostatics, 2nd ed.; Laplacian Press: Morgan Hill, CA, 1997.
5. Pai, D. M.; Springett, B. E. Rev. Mod. Phys. 1993, 65, 163-211.
6. Kwetkus, B. A. Part. Sci. Technol. 1998, 16, 55-68.
7. Gibson, N. J. Electrostatics 1997, 40 and 41, 21-30.
8. Greason, W. D. IEEE Trans. Ind. Appl. 1987, 23, 205-216.
9. Lowell, J.; Rose-Innes, A. C. Adv. Phys. 1980, 29, 947-1023.
10. Gibson, H. W. Polymer 1984, 25, 3-27.
11. Diaz, A. F.; Guay, J. IBMJ. Res. Dev. 1993, 37, 249-259.
12. Guay, J.; Ayala, J. E.; Diaz, A. F.; Dao, L. H. Chem. Mater. 1991, 3, 1068-1073.
13. Lowell, J.; Rose-Innes, A. C. Adv. Phys. 1980, 29, 947-1023.
14. Reference 14 was removed in proof.
15. Grzybowski, B. A.; Stone, H. A.; Whitesides, G. M. Proc. Natl. Acad. Sci. U.S.A. 2002, 99, 4147-4151.
16. Grzybowski, B. A.; Whitesides, G. M. J. Phys. Chem. B 2001, 105, 8770-8775.
17. Gibson, H. W. J. Am. Chem. Soc. 1975, 97, 3832-3833.
18. Gibson, H. W.; Pochan, J. M.; Bailey, F. C. Anal. Chem. 1979, 51, 483-487.
19. Peterson, J. W. J. Appl. Phys. 1954, 25, 501-504.
20. Peterson, J. W. J. Appl. Phys. 1954, 25, 907-915.
21. Wagner, P. E. J. Appl. Phys. 1956, 27, 1300-1310.
22. Grzybowski, B. A.; Stone, H. A.; Whitesides, G. M. Nature 2000, 405, 1033-1036.
23. Grzybowski, B. A.; Wiles, J. A.; Whitesides, G. M. Phys. Rev. Lett. In press.
24. We confirmed this relationship by measuring the charges that developed on a polymeric sphere (available from Small Parts and made of Teflon, poly(methyl methacrylate), or polypropylene) that rolled on the surface of a horizontally vibrated, metallic surface (i.e., a PS Petri dish coated with a thermally evaporated layer of gold, silver, or chromium) and that on the metallic surface itself. After the sphere rolled on the surface and charged, the magnitude and polarity of the charge acquired on the insulating sphere was determined by removing it from the metallic surface and placing it in a Faraday cup that was connected to an electrometer, the magnitude and polarity of the acquired charge on the metal was determined by connecting this conducting surface to the electrometer after tribocharging. The charges on the sphere and surface were of opposite polarity and of approximately equal magnitude.
25. Electrodes of copper and gold were used also. The magnitudes of the charge measured using electrodes of aluminum, copper, and gold were indistinguishable.
26. n, (Sakata, S., Okada, T. J. Aerosol Sci. 1994, 25, 879-893). Any adventitious charge was neutralized by squeezing and releasing the trigger of the gun (∼10 times) that was positioned ∼5 cm above the sphere and film.
27. The charge was detected as a potential difference across an accurately known capacitor in the electrometer. The voltage was scaled according to the equation V = Q/C (where V is potential difference, Q is charge, and C is capacitance) and was displayed as charge on the digital readout of the electrometer.
28. This hypothesis was confirmed after observing that the width of the signals increased to half of the period of precession of the sphere when using a metallic electrode that covered half of the annular region of the PS surface over which the sphere rolled (see Figure 3d).
29. Crowley, J. M. Fundamentals of Applied Electrostatics; Laplacian Press: Morgan Hill, CA, 1999.
30. Neutralizing the system by applying negative and positive ions from a corona discharge after the sphere adhered to the surface allowed the sphere to continue rolling under the influence of the rotating magnetic field.
31. Homologous series of polymers were previously examined to study the mechanism of contact electrification, but in these studies, the series were small and the polymers were usually derivatives of PS (Gibson, H. W. Polymer 1984, 25, 3-27).
32. Chen, Q.; Zhang, D.; Somorjai, G.; Bertozzi, C. R. J. Am. Chem. Soc. 1999, 121, 446-447.
33. Wang, J.; Woodcock, S. E.; Buck, S. M.; Chen, C.; Chen, Z. J. Am. Chem. Soc. 2001, 123, 9470-9471.
34. Veregin, R. P. N.; Tripp, C. P.; McDougall, M. N. V.; Osmond, D. J. Imaging Sci. Technol. 1995, 39, 429-432.
35. Akande, A. R.; Lowell, J. J. Phys. D: Appl. Phys. 1987, 20, 565-578.
36. Gibson, H. W.; Bailey, F. C. Chem. Phys. Lett. 1977, 51, 352-355.
37. Gibson, H. W. Can. J. Chem. 1977, 55, 2637-2641.
38. I,X and are therefore proportional to one another.
39. Akande, A. R.; Lowell, J. J. Phys. D: Appl. Phys. 1987, 20, 565-578.
40. Shinohara, I.; Yamamoto, F.; Anzai, H.; Endo, S. J. Electrost. 1976, 2, 99-110.
41. CRC Handbook of Chemistry and Physics, 81st ed.; Lide, D. R., Ed.; CRC Press: Boca Raton, FL, 2001; pp 12-124.
42. King, D. E. J. Vac. Sci. Technol. A 1995, 13, 1247-1253.
43. Leonard, J.; Lygo, B.; Procter, G. Advanced Practical Organic Chemistry, 2nd ed.; Chapman & Hall: London, 1995; pp 103-106.