Cited Article: Hummer, G. Water conduction through the hydrophobic channel of a carbon nanotube
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Number of Citing Articles: 2 new records this week (2 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Ion and Liquid Dependent Dielectric Failure in Electrowetting Systems
Authors:
Raj, B; Dhindsa, M; Smith, NR; Laughlin, R; Heikenfeld, J
Author Full Names:
Raj, Balaji; Dhindsa, Manjeet; Smith, Neil R.; Laughlin, Robert; Heikenfeld, Jason
Source:
LANGMUIR 25 (20): 12387-12392 OCT 20 2009
Language:
English
Document Type:
Article
KeyWords Plus:
SURFACTANTS; VOLTAGE; WATER; CHIP; LENS
Abstract:
Electrowetting devices often utilize aqueous solutions with ionic surfactants and inorganic salts to modify the electrowetting response. It has been observed in low-voltage electrowetting devices (thin dielectric, < 12V) that a frequent onset of dielectric failure (electrolysis) occurs with use of ionic solutes such as potassium chloride (KCl) or sodium dodecyl sulfate. More detailed current-voltage investigations reveal less dielectric failure for the larger size ions. Specifically, improved resistance to failure is seen for surfactant ions carrying it long alkane chain. Therefore, a catanionic surfactant (in Which both ions are amphiphilic) was Custom Synthesized, and elimination of dielectric failure was observed in both negative and positive voltage. Because water is a small molecule that easily penetrates dielectrics, further experiments were performed to show that dielectric failure can also be eliminated by use of larger size polar molecules such as propylene glycol. !
In addition to these results, important parameters Such as conductivity and interfacial tensions are reported.
Reprint Address:
Heikenfeld, J, Univ Cincinnati, Novel Devices Lab, Dept Elect & Comp Engn, Cincinnati, OH 45221 USA.
Research Institution addresses:
[Raj, Balaji; Dhindsa, Manjeet; Smith, Neil R.; Laughlin, Robert; Heikenfeld, Jason] Univ Cincinnati, Novel Devices Lab, Dept Elect & Comp Engn, Cincinnati, OH 45221 USA
E-mail Address:
heikenjc@ucmail.uc.edu
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Cited Reference Count:
24
Times Cited:
0
Publisher:
AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Subject Category:
Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary
ISSN:
0743-7463
DOI:
10.1021/la9016933
IDS Number:
504DO
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Title:
Effect of Temperature on the Structure and Phase Behavior of Water Confined by Hydrophobic, Hydrophilic, and Heterogeneous Surfaces
Authors:
Giovambattista, N; Rossky, PJ; Debenedetti, PG
Author Full Names:
Giovambattista, Nicolas; Rossky, Peter J.; Debenedetti, Pablo G.
Source:
JOURNAL OF PHYSICAL CHEMISTRY B 113 (42): 13723-13734 OCT 22 2009
Language:
English
Document Type:
Article
KeyWords Plus:
MOLECULAR-DYNAMICS SIMULATIONS; THERMAL-EXPANSION; LIQUID WATER; NANOSCALE CONFINEMENT; REVERSE MICELLES; AQUEOUS-SOLUTION; EWALD SUMMATION; LENGTH SCALES; HYDRATION; PRESSURE
Abstract:
We perform molecular dynamics simulations of water confined between atomically detailed hydrophobic, hydrophilic and heterogeneous (patchy) nanoscale plates. We study the effects of temperature 220 <= T <= 300 K on confined water's behavior at various pressures -0.2 <= P <= 0.2 GPa and plate separations 0.5 <= d <= 1.6 nm. Combining this with our earlier results on the same system [Giovambattista, N.; Rossky, P. J.; Debenedetti, P. G. Phys, Rev. E: Stat., Nordinear, Soft Matter Phys. 2006, 73, 041604; Giovambattista, N.; Rossky, P. J.; Debenedetti, P. G. J. Phys. Chem. C, 2007,11, 1323], where pressure was varied at constant temperature, allows us to compare water's behavior in nanoscale confinement, upon isobaric cooling and isothermal compression, corresponding to paths of interest in protein denaturation. At a fixed temperature, water confined between hydrophobic plates can form vapor, liquid, or crystal (bilayer ice) phases. depending on the values of P and d. The P-d ph!
ase diagrams at T = 300 K and T = 220 K show that cooling, suppresses the vapor phase and stabilizes the liquid and crystal phases. The critical separation d(e)(P), below which vapor forms, shifts to lower values of d and P upon cooling. The density profiles show that, upon cooling, water approaches the hydrophobic plates. Hence, the effective hydrophobicity of the plate decreases as T decreases, consistent with the suppression of the vapor phase upon cooling, However. both the orientation of water's molecules at the interface and the water contact angle on the hydrophobic Surface show practically no temperature dependence. Simulations of water confined by heterogeneous plates decorated with hydrophobic and hydrophilic patches reveal that cooling leads to appreciable blurring of the differences between water densities at hydrophobic and hydrophilic, surfaces. This observation, together with remarkable similarities in confined water's response to isobaric cooling and to isot!
hermal compression, suggests that (fie invasion of hydrophobic!
cavitie
s by water is all important mechanism underlying both pressure and cold denaturation of proteins,
Reprint Address:
Debenedetti, PG, Princeton Univ, Dept Chem Engn, Princeton, NJ 08544 USA.
Research Institution addresses:
[Giovambattista, Nicolas; Debenedetti, Pablo G.] Princeton Univ, Dept Chem Engn, Princeton, NJ 08544 USA; [Giovambattista, Nicolas] CUNY Brooklyn Coll, Dept Phys, Brooklyn, NY 11210 USA; [Rossky, Peter J.] Univ Texas Austin, Dept Chem & Biochem, Inst Computat Engn & Sci, Austin, TX 78712 USA
E-mail Address:
pdebene@princeton.edu
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Cited Reference Count:
79
Times Cited:
0
Publisher:
AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Subject Category:
Chemistry, Physical
ISSN:
1520-6106
DOI:
10.1021/jp9018266
IDS Number:
505EB
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