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New Investigations of Liquid Marbles
Ed. Bormashenko, The Ariel University, Ariel, Israel Харьковский национальный университет имени В. Н. Каразина, Октябрь, 2013
What is a Liquid Marble? A liquid Marbles Are Non-Stick Droplets Coated with Macro- or Nano-Scaled Powder P. Aussillous, D. Quéré, Nature, 411 (2001) 924-927
Deformation of water marbles by gravity
V=10 μl V=50 μl
Marbles Sit on Air!
Hydrophobic particles liquid Solid substrate
E. Bormashenko, Ye. Bormashenko, A. Musin, Z. Barkay, ChemPhysChem 2009, 10, 654 15 μl marble containing 0.3 M NaOH water solution floating on the water containing phenolphthalein alcohol solution (0.1% wt.) Coloring after puncturing the marble
E. Bormashenko, Ye. Bormashenko, A. Musin, Z. Barkay, ChemPhysChem 2009, 10, 654 30 μl marble containing 0.1 M CaCl 2 water solution floating on the 0.1 M Na 2 CO 3 water solution before puncturing with a needle CaCO 3 precipitate formed after puncturing the marble
Floating Marbles
Journal of Colloid and Interface Science , 333, 2009 , 419. Ed. Bormashenko, Ye. Bormashenko, Al. Musin
Revealing Water Surface Pollution with Liquid Marbles E. Bormashenko, A. Musin Applied Surface Science , 255, 12 , 2009 , 6429-6431
Superhydrophobic Behavior of Liquid Marbles
Motivation
Liquid marbles – an alternative approach to manufacturing non-stick surfaces Study of physical properties of liquid marbles Study of the possibility of remote actuation of liquid marbles
Materials:
Polyvinylidene fluoride (PVDF) Polytetrafluoroethylene (PTFE) Polyethylene (PE) Lycopodium Carbon black ( hydrophilic!
)
Lycopodium Particles
ESEM Image of the Marble Surface (Coated with Lycopodium)
ESEM Image of Marble Surface (Coated with PVDF) Ed. Bormashenko, R. Pogreb, G. Whyman, Al. Musin, Ye. Bormashenko, Z. Barkay, 2009, 25 Langmuir , , 1893–1896
Liquid Marble Coated With Carbon Black
ρ ~170 Ω∙m Air pockets Hydrophilic particles
Properties of Liquid Marbles
What is the effective surface tension of liquid marbles?
Aussillous and D. Quéré Proceedings Royal Soc. A, 2006, 462, 973.
G. McHale, S. J. Elliott, M. I. Newton, D. L. Herbertson, K. Esmer, Langmuir, 2009, 25, 529.
T. Arbatan, W. Shen Langmuir, 2011, 27, 12923 C. Planchette, E. Lorenceau, A.-L. Biance, Soft Matter, 2012, 8, 2444.
Surface Tension of Marbles Established with Vibrations
h
( 2
Vf
)( 1 2 cos )
R θ θ δθ
θ+δθ
Ed. Bormashenko, R. Pogreb, G. Whyman, Al. Musin, Ye. Bormashenko, Z., Langmuir , 2009, 25 (4), 1893–1896.
Values of surface tension measured with different methods.
Marbles γ, mJ/m2 maximal height method marble shape analysis vibration method PVDF 70±7 79±5 75±3 PE 66±5 63±3 60±4 Teflon Lycopodium Carbon black 60±6 50±5 66±4 53±5 60±5 68±3 53±3 43±3 -
Effective Surface Tension of Marbles
A B Pendant marbles: (A) lycopodium and (B) carbon black
Establishment of the effective surface tension with the pendant marble method
r
( 1 1
r
2 ) ( 1
r
r
2 ) 3 / 2
gz
E. Bormashenko, Al. Musin, G. Whyman, Z. Barkay, A. Starostin, V. Valtsifer, Vl. Strelnikov Colloids and Surfaces A: 425 (2013) 15-23
Dependence of the effective surface tension on the volume during inflation (open circles) and evaporation (solid circles) for the lycopodium coated marbles .
Dependence of the effective surface tension on the volume during inflation (open circles) and evaporation (solid circles) for the PVDF coated marbles .
Surface Tension of Liquid Marbles is of a Pronounced Hysteretic Nature
E. Bormashenko, Al. Musin, G. Whyman, Z. Barkay, A. Starostin, V. Valtsifer, Vl. Strelnikov Colloids and Surfaces A: 425 (2013) 15-23
Actuation of Liquid Marbles
Ferrofluidic Marbles
V=25 cm/s magnetic powder PVDF Ed. Bormashenko, R. Pogreb, Ye. Bormashenko, Al. Musin, T. Stein, Langmuir , 2008, 24 , 12119–12122
Ferrofluidics with Liquid Marbles
g
Ferrofluidic marble magnet superhydrophobic surface
Ed. Bormashenko, R. Pogreb, Ye. Bormashenko, Al. Musin, T. Stein, Langmuir , 2008, 24 , 12119–12122
T
E
c 4 0 T=1.63-1.65
r
0
Jetting Liquid Marbles (Taylor Instability) water marbles immersed in PDMS Colloid Polymer Sci. (2013) 291:1535–1539
Squared critical electric field versus inverse radius, of the spherical marble of an equivalent volume. Different slopes resemble different surface energies at the marble/oil interfaces.
E
c 2 1
A r
0
B
eff 4 0
A T
2 300000 200000 100000 400 450 500 550 1 /r 0 , m -1 600 Lycopodium marble PVDF marble Teflon marble Water droplet 650 700
Micro-Pump Based on Liquid
Bormashenko, E. et al,
Applied Physics Letters
, 97 (2010) 091908
Marbles
Parameters of the Micro-Pump
p
2 (
eff
,
PVDF
eff
,
lyc
)
R
20
Pa Q
p
8
l r
4
Q
100
l s
Marbles Swallowing One Another
Composite Liquid Marbles and Their Actuation
PTFE (white) and carbon black coated (black) 20 µl liquid marbles
Preparing Janus Marbles vibration Ed Bormashenko, Ye. Bormashenko, R. Pogreb, O. Gendelman, Janus Droplets: Liquid Marbles Coated with Dielectric/Semiconductor Particles Langmuir 2011, 27(1), 7–10
Composite 40 µl Janus liquid marble
Watermelon-like marble obtained by merging of two Janus marbles
The sequence of images demonstrating the rotation of the Janus marble by the growing electric field Ed Bormashenko, Ye. Bormashenko, R. Pogreb, O. Gendelman, Janus Droplets: Liquid Marbles Coated with Dielectric/Semiconductor Particles Langmuir 2011, 27(1), 7–10
The sequence of images illustrating the behavior of composed marble exposed to electric field. A. Initial state, the composite marble built of the water (red) and CH 2 I 2 ( white) of the same volume of 10 µl. B. Water marble climbed on the MI one.
A B
10 µl MI (white) and 10 µl water (red) marbles exposed to the electric field. The initial state exposed to E =7 C. 10 µl MI (white) and 40 µl water (red) marbles exposed to the electric field. The initial state marbles exposed to × 10 E= 7 5 E × =0, B. The marbles V/m 10 5 V/m E =0, D. The
Sensitivity of water and diiodomethane (CH 2 I 2 ) marbles to electric field
G
G S
G gr
G el G el
0
E
2
V
2
G gr
Vgh
0
gR E
2
Sensitivity of water and diiodomethane (CH 2 I 2 ) marbles to electric field
water MI
MI water
MI water R MI R water
water MI
water
MI
MI water
50 same radii
water MI
30
V MI V water
1 4
Manufacturing “sandwich marbles” containing solid particles
powder foamed PS ball liquid
Sandwich water marbles containing spherical particle of foamed PS
Manufacturing “sandwich marbles”
FD-POSS powder Liquids: Hexadecane or Toluene DMSO
Sandwich Marbles: Hexadecane Marble Comprising DMSO (Red)
Micro-Reactors Based on Marbles
The shell enwrapping the marble is permeable for gases Marbles containing a solution of ammonia acetate, acetic acid and acetylacetone exposed to the formaldehyde vapor Bormashenko E, et al International Journal of Chemical Reactor Engineering, 9 (2011) S10 .
Pickering-like emulsions obtained via liquid marbles (water marbles immersed in PDMS)
Bormashenko E., Pogreb R., Musin Al., Stable water and glycerol marbles immersed in organic liquids: From liquid marbles to Pickering-like emulsions, Journal of Colloid and Interface Science 366 (2012) 196–199.
Lycopodium-coated shaped marbles
Conclusions
Liquid marbles are non-stick droplets coated with hydrophobic or hydrophilic powder Marbles are separated from a substrate by air pockets Janus and composite marbles could be manufactured
Conclusions * Surface Tension of Liquid Marbles is of a Pronounced Hysteretic Nature * Marbles could be actuated with magnetic and electric fields * Possible applications of marbles: Micro-fluidic devices, Gas sensing Precise transport of small quantities of liquids, Revealing of water pollution, blood typing
Acknowledgements The authors are grateful to Professor M. Zinigrad for his continuous support of our research activity The authors are thankful to Mrs. Zahava Barkay for SEM and ESEM imaging