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Volumn 24, Issue 21, 2008, Pages 12196-12201

Collodial cluster arrays by electrohydrodynamic printing

Author keywords

[No Author keywords available]

Indexed keywords

BREAK UP; CAPILLARY FORCES; COLLOIDAL PARTICLES; COLLOIDAL SUSPENSIONS; HYDROPHOBIC SURFACES; MULTIPLE STRUCTURES; PARTICLE- CLUSTERS; SELF-ASSEMBLY; SESSILE DROPS; SINGLE PARTICLES;

EID: 56449094945     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la8023327     Document Type: Article
Times cited : (41)

References (60)
  • 38
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    • Wang, D.; Park, M.; Park, J.; Moon, J. Mater. Res. Soc. Symp. Proc. 2006, 901E, 0901-Ra16-10-Rb16-10.
    • Wang, D.; Park, M.; Park, J.; Moon, J. Mater. Res. Soc. Symp. Proc. 2006, 901E, 0901-Ra16-10-Rb16-10.
  • 43
    • 56449111586 scopus 로고    scopus 로고
    • The receding contact angle of water on this substrate is between 96° and 99°. Drelich, J.; Wilbur, J. L.; Miller, J. D.; Whitesides, G. M. Langmuir 1992, 12, 1913.
    • The receding contact angle of water on this substrate is between 96° and 99°. Drelich, J.; Wilbur, J. L.; Miller, J. D.; Whitesides, G. M. Langmuir 1992, 12, 1913.
  • 44
    • 0001255625 scopus 로고
    • Contact Angle, Wettability and Adhesion
    • Fowkes, F. M, Ed, American Chemical Society: Washington, DC
    • Dettre, R.; Johnson, R. In Contact Angle, Wettability and Adhesion; Fowkes, F. M., Ed.; Advances in Chemistry Series, No. 43;American Chemical Society: Washington, DC, 1964.
    • (1964) Advances in Chemistry Series , vol.43
    • Dettre, R.1    Johnson, R.2
  • 49
    • 56449117565 scopus 로고    scopus 로고
    • 3.
    • 3.
  • 50
    • 56449127729 scopus 로고    scopus 로고
    • 2, where γ, r, g, and μ are the surface tension, radius, gravitational acceleration, and viscosity of the solution (for our polymeric solution, ∼8 cP, based on its PEO concentration), respectively, is found as 5.5. Using this value, the dimensionless wavenumber, corresponding to the fastest disturbance growm rate, is read from Figure 129 of ref 48 by Chandrasekhar as ∼0.5. Wavelength is calculated from 2πr/0.5 as 60.7 μm.
    • 2, where γ, r, g, and μ are the surface tension, radius, gravitational acceleration, and viscosity of the solution (for our polymeric solution, ∼8 cP, based on its PEO concentration), respectively, is found as 5.5. Using this value, the dimensionless wavenumber, corresponding to the fastest disturbance growm rate, is read from Figure 129 of ref 48 by Chandrasekhar as ∼0.5. Wavelength is calculated from 2πr/0.5 as 60.7 μm.
  • 54
    • 56449112942 scopus 로고    scopus 로고
    • Time for evaporation of a sessile drop scales as te ∼ ρR2/4CD (ref 48, and the settling velocity of the particles scales as Us ∼ 2(ρp, ρ)gRp/9μ. Here, ρ, ρp, g, R, Rp, μ C, and D are the density of the liquid and the particle, gravitational acceleration, radii of the drop and the particle, viscosity of the liquid, saturation concentration of the liquid, and the diffusivity of its vapor in air, respectively. Substituting the values representing experimental conditions, the settling velocity for 5.7 μm polystyrene particles is found to be ∼0.16μm/s. The time of evaporation for a drop wim a 30 μm diameter is ∼0.1 s. Hence, during the time of evaporation, particles are expected to settle at a ∼16 nm distance due to gravity
    • p, μ C, and D are the density of the liquid and the particle, gravitational acceleration, radii of the drop and the particle, viscosity of the liquid, saturation concentration of the liquid, and the diffusivity of its vapor in air, respectively. Substituting the values representing experimental conditions, the settling velocity for 5.7 μm polystyrene particles is found to be ∼0.16μm/s. The time of evaporation for a drop wim a 30 μm diameter is ∼0.1 s. Hence, during the time of evaporation, particles are expected to settle at a ∼16 nm distance due to gravity.
  • 55
    • 56449122480 scopus 로고    scopus 로고
    • p). In these expressions, t is time, k is the Boltzmann constant, and T is the temperature. Using the time as the evaporation time defined above, the root mean square distance at room temperature is calculated as ∼51 nm for 5.7 μm particles.
    • p). In these expressions, t is time, k is the Boltzmann constant, and T is the temperature. Using the time as the evaporation time defined above, the root mean square distance at room temperature is calculated as ∼51 nm for 5.7 μm particles.
  • 58
    • 56449102497 scopus 로고    scopus 로고
    • We calculated the sum of the electrostatic and the van der Waals energies for spheres with a constant surface charge density for the calculations, see eq 4.10.11 in Russel, W. B, Saville, D. A, Schowalter, W. R. Colloidal Dispersions; Cambridge University Press: Cambridge, 1989
    • We calculated the sum of the electrostatic and the van der Waals energies for spheres with a constant surface charge density (for the calculations, see eq 4.10.11 in Russel, W. B., Saville, D. A.; Schowalter, W. R. Colloidal Dispersions; Cambridge University Press: Cambridge, 1989,
  • 59
    • 56449093341 scopus 로고    scopus 로고
    • 2. The total potential of the particles has a shallow secondary minimum of ∼0.029 kT, which can be easily overcome by the thermal energy. This is followed by a steep repulsive energy barrier of thousands of kT, which prevents the particles from reaching the primary minimum.
    • 2. The total potential of the particles has a shallow secondary minimum of ∼0.029 kT, which can be easily overcome by the thermal energy. This is followed by a steep repulsive energy barrier of thousands of kT, which prevents the particles from reaching the primary minimum.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.