Droplet size and morphology analyses of dry liquid

Kido, Kohei; Sumoto, Takashi; Yasui, Yoshihide; Nakamura, Yoshinobu; Fujii, Syuji

doi:10.1016/j.apt.2017.04.027

Cited by 16 publications

(10 citation statements)

References 29 publications

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“…DL was prepared by mixing an aqueous solution containing branched polyethyleneimine (PEI,

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n = 300) with surface‐modified silica (SiO 2 ) nanoparticles approximately, which were 25 nm in diameter. [ 69 ] The irregularly shaped but isolated DLs with an average size of 161 ± 43 µm were obtained through particle size selection using sieves (Figure 2e,f). The resultant DLs were dispersed on the PDA‐coated paper (inset of Figure 2g).…”

Section: Resultsmentioning

confidence: 99%

“…Although DLs consist of more than 90% liquid, the coating of the solid particles prevents coalescence of the liquid droplets and wetting of the supporting substrate. The characteristic properties are applied to the preparation of containers for liquid storage, [67][68][69] reactors for heterogeneous catalytic reactions, [70] and absorbents for gas. [71,72] DLs have attracted attention for their potential applications in drug delivery and cosmetics.…”

Section: Introductionmentioning

confidence: 99%

“…[71,72] DLs have attracted attention for their potential applications in drug delivery and cosmetics. Although DLs can collapse and subsequently release encapsulated liquid, [60,61,69] the on-demand controlled release properties have not been effectively used as stimuli-responsive materials. In the present study, we focused on the interior liquid spilling out of a DL with the application of a weak compression stress.…”

Section: Introductionmentioning

confidence: 99%

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Ultrahigh‐Sensitive Compression‐Stress Sensor Using Integrated Stimuli‐Responsive Materials

et al. 2021

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Measurement of mechanical stresses, such as compression, shear, and tensile stresses, contributes toward achieving a safer and healthier life. In particular, the detection of weak compression stresses is required for healthcare monitoring and biomedical applications. Compression stresses in the order of 106–1010 Pa have been visualized and/or quantified using mechano‐responsive materials in previous works. However, in general, it is not easy to detect compression stresses weaker than 103 Pa using conventional mechano‐responsive materials because the dynamic motion of the rigid mechano‐responsive molecules is not induced by such a weak stress. In the present work, weak compression stresses in the order of 100–103 Pa are visualized and measured via the integration of stimuli‐responsive materials, such as layered polydiacetylene (PDA) and dry liquid (DL), through response cascades. DLs consisting of liquid droplets covered by solid particles release the interior liquid and collapse with application of a weak compression stress. The color of the layered PDA is changed by the spilled liquid as a chemical stress. A variety of weak compression stresses, such as expiratory pressure, are visualized and colorimetrically measured using the paper‐based device of the integrated stimuli‐responsive materials. Diverse mechano‐sensing devices can be designed via the integration of stimuli‐responsive materials.

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“…DL was prepared by mixing an aqueous solution containing branched polyethyleneimine (PEI,

\overset{M}{true}

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ultrahigh‐Sensitive Compression‐Stress Sensor Using Integrated Stimuli‐Responsive Materials

et al. 2021

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“…Particle-stabilized bubbles/foams share many similarities with particle-stabilized emulsions formed from oils and water, as they relate to the ability to achieve high stability and stable nonspherical shapes. Therefore, the principles established in stimuli-responsive particle-stabilized foam/bubble systems should also be applicable to other particle-stabilized soft dispersed systems, including Pickering-type emulsions, , liquid marbles, and dry liquids. , …”

Section: Concluding Remarks and Future Research Directionsmentioning

confidence: 99%

“…Therefore, the principles established in stimuli-responsive particle-stabilized foam/bubble systems should also be applicable to other particle-stabilized soft dispersed systems, including Pickering-type emulsions, 86,87 liquid marbles, 88 and dry liquids. 89,90 It is technically feasible to fabricate stimuli-responsive materials, including porous materials and microreactors, from foams and bubbles. The utilization of gas−water−solid contact lines as a chemical reaction platform can enable the fabrication of stimuli-responsive multiple catalysis reaction systems.…”

Section: Concluding Remarks and Future Research Directionsmentioning

confidence: 99%

Stimuli-Responsive Bubbles and Foams Stabilized with Solid Particles

Fujii

Nakamura

2017

Langmuir

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Particle-stabilized bubbles and foams have been observed and used in a wide range of industrial sectors and have been exploited as a technology platform for the production of advanced functional materials. The stability, structure, shape, and movement of these bubbles and foams can be controlled by external stimuli such as the pH, temperature, magnetic fields, ultrasonication, mechanical stress, surfactants, and organic solvents. Stimuli-responsive modes can be categorized into three classes: (i) bubbles/foams whose stability can be controlled by the adsorption/desorption/dissolution of solid particles to/from/at gas-liquid interfaces, (ii) bubbles/foams that can move, and (iii) bubbles/foams that can change their shapes and structures. The stimuli-responsive characteristics of bubbles and foams offer potential applications in the areas of controlled encapsulation, delivery, and release.

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Stimuli‐Responsive Sponge for Imaging and Measuring Weak Compression Stresses

et al. 2022

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Imaging and measuring compression stresses secure a safe and healthy life. Compression stresses in kPa range are not easily detected by conventional mechanoresponsive materials because microscopic molecular motion of the chromophores is not induced by such weak stresses. Moreover, imaging of the stress distribution is not achieved so far. The present study shows a sponge device combining two stimuli‐responsive materials, a capsule releasing interior liquid and color‐changing polymer in responses to compression stress and chemical stimulus, respectively. The stimuli‐responsive capsule is dispersed on a melamine sponge comprised of the fibers with coating the layered polydiacetylene (PDA). The application of weak compression stresses induces collapse of the capsules, outflow of the interior liquid, and subsequent irreversible color change of PDA. The cascading response in the sponge device colorimetrically enables imaging of the distribution and measuring the strength of the compression stresses in kPa range. Furthermore, the device demonstrates imaging and measuring unknown weak compression stresses applied by the irregular‐shaped objects. A couple of clinical issues in surgical operation of intestine are studied using the stress‐imaging sponge device. The device and its design strategy can be applied to stress imaging in a variety of fields.

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Droplet size and morphology analyses of dry liquid

Cited by 16 publications

References 29 publications

Ultrahigh‐Sensitive Compression‐Stress Sensor Using Integrated Stimuli‐Responsive Materials

Ultrahigh‐Sensitive Compression‐Stress Sensor Using Integrated Stimuli‐Responsive Materials

Stimuli-Responsive Bubbles and Foams Stabilized with Solid Particles

Stimuli‐Responsive Sponge for Imaging and Measuring Weak Compression Stresses

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