Thermo-responsive liquid marbles

Yusa, Shin Ichi; Morihara, M.; Nakai, Keita; Fujii, Syuji; Nakamura, Yoshinobu; Maruyama, Atsushi; Shimada, Noritomo

doi:10.1038/pj.2013.84

Cited by 60 publications

(51 citation statements)

References 24 publications

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“…[1] It does not wet any substrate because of the isolation effect of the surface particles and has been studied as a miniature container, revealing characteristics valuable in many fields, [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] such as electrochemical analysis, [5] material synthesis, [6] cell culture, [7][8][9][10] and various environmental testing, including pH, [11,12] temperature, [13] ultraviolet [14] /infrared light, [15] and chemical composition. [1] It does not wet any substrate because of the isolation effect of the surface particles and has been studied as a miniature container, revealing characteristics valuable in many fields, [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] such as electrochemical analysis, [5] material synthesis, [6] cell culture, [7]…”

Section: Doi: 101002/admi201701139mentioning

confidence: 99%

Liquid Shaping Based on Liquid Pancakes

Shi

Wang

et al. 2017

Adv Materials Inter

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Technically, this is achieved by increasing the particle density through changing the drop's surface area and, in the case of a liquid marble, the approach mainly includes droplet/marble impingement on a powder, [23,31] marble coalescence, [28,32] evaporation from the marble, [25][26][27] and artificial liquid extraction. [33] Given that marble shapes can be well controlled, such structured marbles could serve as smart containers allowing complex manipulations of the internal substances and, hence, a wider variety of results can be expected, compared with applying only spherical or puddle-shaped liquid marbles. However, nearly all the above works addressed liquid marble deformations mainly as phenomenon discussions, instead of being concerned with controllability or application feasibility. Obviously, although random shape is not hard to obtain, the nature of liquid destines the difficulty in transforming a spherical droplet into a designed shape despite particle coverage. For this, an addition strategy which joined units of simply deformed liquid marbles was proposed recently, demonstrating a fair designability of liquid shape, and the resulting shaped liquids were so coined the term "liquid plasticine." [34] However, the defects of this down-top shape design are significant. The main problem is that droplet movement during the joining process is difficult to control, such that the shape of the final liquid plasticine is not accurate in detail, particularly when constructing a large, complex structure.Here we show that the fine control of liquid shape could be realized using a top-down design with a subtraction strategy, in which a coated liquid pancake, with a large surface area, is segmented into a liquid plasticine with a precise structure. The process is well controlled and a clear advantage is achieved in the form of timesaving. A sol-gel superhydrophobic coating with weak binding force, and a container accommodating liquid of milliliter order, are key factors in this method. This work may provide opportunities for real and practical applications of structured/shaped liquids as smart containers.A Petri dish was coated on all surfaces by immersing it into an alkylated SiO 2 collosol, which was then withdrawn and air dried for 2 min. The resulting xerogel-coated Petri dish displayed a colorful appearance because of its nonuniform coating thickness that induced inhomogeneous light interference (Figure 1a). The coating was composed of about a dozen layers of hydrophobic SiO 2 nanoparticles (NPs) of ≈20 nm in diameter (Figure 1b), and a water drop on such a coating had a contact Liquid marbles with quasi-spherical shapes have great application potential as miniature containers. Recently, their shape modification is investigated, revealing great possibilities in broadening the uses for such containers. Current methods have demonstrated shape designability, but fine control of the final shape, important in applications, has remained a problem. Here, a facile method, based on a gravity-induced liquid pancake coated...

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Section: Doi: 101002/admi201701139mentioning

confidence: 99%

Liquid Shaping Based on Liquid Pancakes

Shi

Wang

et al. 2017

Adv Materials Inter

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“…Liquid marbles, [1][2][3][4][5] which are liquid droplets stabilized with solid particles at gas-liquid interfaces, have attracted increasing attention in view of their potential applications in cosmetics, 6,7 transport & microfluidics, 1,8-11 miniature reactors, 12,13 personal & health care products, 14 sensors, [15][16][17] accelerometers, 18 gas storage 19,20 and actuators. [33][34][35][36][37][38][39][40][41][42][43][44] In principle, such synthetic polymer particles should be particularly attractive as liquid marble stabilizers, because their surface chemistries can be readily designed using various functional monomers. Solid particles which can stabilize liquid marbles include surface-modified lycopodium powder, 23,24 hydrophobic silica particles, [25][26][27][28] carbon black, 29,30 carbon nanotubes 31 or small organic molecule powders, 32 and increasingly, organic polymer particles.…”

Section: Introductionmentioning

confidence: 99%

“…21,22 Relatively hydrophobic particles that can adsorb at the gas-liquid interface are generally used in order to stabilize these liquid-in-gas dispersed systems. 35,37,[39][40][41][42] Another attractive feature of polymer particles is film forming ability, which has been widely deployed in the paint, adhesive and paper industries. [33][34][35][36][37][38][39][40][41][42][43][44] In principle, such synthetic polymer particles should be particularly attractive as liquid marble stabilizers, because their surface chemistries can be readily designed using various functional monomers.…”

Section: Introductionmentioning

confidence: 99%

Liquid marble and water droplet interactions and stability

et al. 2015

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The interactions between two individual water droplets were investigated in air using a combination of coalescence rig and high speed video camera. This combination allows the visualization of droplet coalescence dynamics with millisecond resolution which provides information on droplet stability. Bare water droplets coalesced rapidly upon contact, while droplet stability was achieved by coating the droplets with polystyrene particles carrying pH-responsive poly[2-(diethylamino)ethyl methacrylate] hairs (PDEA-PS particles) to form liquid marbles. The asymmetric interaction of a water droplet (pH 3 or 10) armoured with the PDEA-PS particles (liquid marble) with a bare droplet at pH 3 exhibited intermediate stability with coalescence observed following an induction time. The induction time was longer for the pH 10 liquid marble, where the PDEA-PS particles have a hydrophobic surface, than in the case of a pH 3 liquid marble, where the PDEA-PS particles have a hydrophilic surface. Furthermore, film formation of PDEA-PS particles on the liquid marble surface with toluene vapour confirmed capsule formation which prevented coalescence with the neighbouring water droplet instead wetting the capsule upon contact within 3 milliseconds. This study illuminates the stability of individual particle-stabilized droplets and has potential impact on processes and formulations which involve their interaction.

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“…[21][22][23][24][25][26] Recently, liquid marbles have attracted significant attention in view of their potential applications in cosmetics, 27,28 transport & microfluidics, 29,30 miniature reactors, 31,32 personal & health care products, 33 sensors, [34][35][36][37][38] accelerometers, 39 and gas storage. [21][22][23][24][25][26] Recently, liquid marbles have attracted significant attention in view of their potential applications in cosmetics, 27,28 transport & microfluidics, 29,30 miniature reactors, 31,32 personal & health care products, 33 sensors, [34][35][36][37][38] accelerometers, 39 and gas storage.…”

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confidence: 99%