Preparation of poly(lactic-acid)-particle stabilized liquid marble and the improvement of its stability by uniform shell formation through solvent vapor exposure

Matsukuma, Daisuke; Watanabe, Hisayuki; Minn, Myo; Fujimoto, Aya; Shinohara, Takamichi; Jinnai, Hiroshi; Takahara, Atsushi

doi:10.1039/c3ra40693h

Cited by 34 publications

(38 citation statements)

References 20 publications

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“…Cracks were not observed on the bubble surface after DCM treatment, although the cracks were formed in the case of polymer particle-stabilized liquid marbles after solvent treatment. 32,33 This might be attributed to the sufficient coating of the bubble with PNVPPS particles.…”

Section: ¹2mentioning

confidence: 99%

Hollow Microspheres Fabricated from Aqueous Bubbles Stabilized with Latex Particles

et al. 2015

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Aqueous bubbles stabilized solely by micrometer-sized, near-monodisperse, sterically stabilized polystyrene (PS) latex particles can be transformed into polymeric hollow microspheres containing air by exposure to a solvent: the PS particles adsorbed at the airwater interface are plasticized with the solvent to form a polymer film on the surface of the aqueous bubbles.Solid colloidal particles are well known to stabilize liquid bubbles by adsorbing to gasliquid interfaces. can all work as efficient particulate bubble stabilizers. Recent studies confirmed that there are many similarities between particle-stabilized bubbles and emulsions. 3,7,25 In principle, synthetic organic polymer particles should be particularly attractive as bubble stabilizers because they can be readily designed with specific surface chemistries using various functional monomers. Thanks to this advantage, it is possible to introduce a stimulus-responsive character to the bubbles. For example, stimulus-responsive aqueous bubbles, whose stability and structure can be controlled by external stimuli including pH and temperature, can be fabricated using polymer particles. 2628One of the other attractive features of polymer particles is their film-forming ability, which has been widely employed in the paint, adhesive, and paper industries. 29Herein, we describe the preparation of aqueous bubbles stabilized with polymer particles and the fabrication of polymeric hollow microspheres by solvent treatment (Scheme 1). Films formed from polymer particles adsorbed on the air bubble surface should lead to reduced pore size between particles and form a rigid shell on the air bubbles. The resulting air bubbles and polymeric hollow microspheres were extensively characterized in terms of their size and morphology using optical microscopy (OM) and scanning electron microscopy (SEM).Free radical dispersion polymerization was conducted in 2-propanol using poly(N-vinylpyrrolidone) (PNVP) as a steric stabilizer to synthesize near-monodisperse PNVP-stabilized polystyrene (PS) latex particles (PNVPPS particles).19,30 After eight centrifugation/redispersion cycles using water to remove the nonadsorbed PNVP stabilizer, the supernatant surface tension was 69 mN m ¹1, which is close to that of pure water. This confirms that the concentration of the nonadsorbed PNVP stabilizer in the aqueous phase is close to zero. SEM studies of dried PNVPPS particles confirm that the PNVPPS particles with spherical morphology were obtained and the numberaverage particle diameter (D n ) and associated polydispersity (D w /D n ) were estimated to be 1.51 « 0.03¯m and 1.01, respectively. Laser diffraction particle size analysis was used to determine that the volume-average diameter in water was 1.70 « 0.40¯m, which is similar to the number-average diameter. The PNVP colloidal stabilizer should be adsorbed to the PS particle surface to confer steric stabilization, because a colloidally stable aqueous dispersion was obtained. Unfortunately, nitrogen element originating from PNVP on the PS p...

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Section: ¹2mentioning

confidence: 99%

Hollow Microspheres Fabricated from Aqueous Bubbles Stabilized with Latex Particles

et al. 2015

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“…The stability of marbles is crucial for their microfluidics and sensing applications. Marbles possessing increased mechanical and time stability were prepared by Matsukuma et al (2013). It is noteworthy that liquid marbles retain non-stick properties on a broad diversity of solid and liquid supports (Bormashenko et al 2009b, c).…”

Section: Introductionmentioning

confidence: 99%

Liquid marbles containing petroleum and their properties

et al. 2015

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Liquid marbles (non-stick droplets) containing crude petroleum are reported. Liquid marbles were obtained by use of fluorinated decyl polyhedral oligomeric silsequioxane (FD-POSS) powder. Marbles containing crude petroleum remained stable on a broad diversity of solid and liquid supports. The effective surface tension of marbles filled with petroleum was established. The mechanism of friction of the marbles is discussed. Actuation of liquid marbles containing crude petroleum with an electric field is presented.

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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%

“…[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. 43,44 The instability of liquid marbles is generally attributed to the wetting of the solid particles adsorbed to the air-liquid interface, which results in the disruption of the liquid marbles and a Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of coalescence with their neighbours. 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.…”

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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Preparation of poly(lactic-acid)-particle stabilized liquid marble and the improvement of its stability by uniform shell formation through solvent vapor exposure

Cited by 34 publications

References 20 publications

Hollow Microspheres Fabricated from Aqueous Bubbles Stabilized with Latex Particles

Hollow Microspheres Fabricated from Aqueous Bubbles Stabilized with Latex Particles

Liquid marbles containing petroleum and their properties

Liquid marble and water droplet interactions and stability

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