Aqueous Foams Stabilized with Several Tens of Micrometer-sized Polymer Particles: Effects of Surface Hydrophilic–Hydrophobic Balance on Foamability and Foam Stability

Fukuoka, Keisuke; Tomikawa, Akira; Nakamura, Yoshinobu; Fujii, Syuji

doi:10.1246/cl.160182

Cited by 12 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During water drainage from the drying foams, these monolayers should be forced together to form bilayers. Similar results were reported previously (Fujii et al, 2006b,c; Dupin et al, 2008; Nakayama et al, 2015a; Fukuoka et al, 2016). In some cases, monolayers and multilayers (mainly triple layers) were observed.…”

Section: Resultssupporting

confidence: 91%

“…Highly magnified OM images of the bubble surface indicated the formation of hexagonal-close-packed arrays of the particles with some flocs on them (Figure 4B) (white arrows indicate the flocs). These particle arrays at air-water interface have been observed in previous studies (Fujii et al, 2006b,c, 2012; Dupin et al, 2008; Nakayama et al, 2015a; Fukuoka et al, 2016; Sekido et al, 2017a,b). It is worth noting that the bubbles were not fully covered with flocculated P4VP-PS particles.…”

Section: Resultssupporting

confidence: 81%

See 1 more Smart Citation

pH-Responsive Aqueous Bubbles Stabilized With Polymer Particles Carrying Poly(4-vinylpyridine) Colloidal Stabilizer

et al. 2018

Self Cite

View full text Add to dashboard Cite

Free radical dispersion polymerization was conducted to synthesize near-monodispersed, micrometer-sized polystyrene (PS) particles carrying pH-responsive poly(4-vinylpyridine) (P4VP) colloidal stabilizer (P4VP-PS particles). The P4VP-PS particles were extensively characterized in terms of morphology, size, size distribution, chemical composition, surface chemistry, and pH-response using optical and scanning electron microscopies, elemental microanalysis, X-ray photoelectron spectroscopy, laser diffraction particle size analysis, and zeta potential measurement. The P4VP-PS particles can work as a pH-responsive stabilizer of aqueous bubbles by adsorption at the air-water interface. At and above pH 4.0, where the particles have partially protonated/non-protonated P4VP stabilizer with relatively hydrophobic character, particle-stabilized bubbles were formed. Optical and scanning electron microscopy studies confirmed that the P4VP-PS particles were adsorbed at the air-water interface of the bubbles in aqueous media. At and below pH 3.0, where the particles have cationic P4VP stabilizer with water-soluble character, no bubble was formed. Rapid disruption of the bubbles can be induced by decreasing the pH; the addition of acid caused the in situ protonation of pyridine groups in P4VP, which impart water-soluble character to the P4VP stabilizer, and the P4VP-PS particles were desorbed from the air-water interface. The bubble stabilization/destabilization cycles could be repeated at least five times.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 81%

pH-Responsive Aqueous Bubbles Stabilized With Polymer Particles Carrying Poly(4-vinylpyridine) Colloidal Stabilizer

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, they have some disadvantages of requiring a high concentration or existing toxicity . Recently, partially hydrophobic colloidal particles are found to stabilize foam effectively as a result of their abilities to quickly adsorb at the air/water interface and provide a physical barrier to slow liquid drainage. − However, most particles belong to inorganic particles or synthetic particles, such as polystyrene particles, poly[2-(dimethylamino)ethyl methacrylate] (PDMA)–polystyrene particles, and SiO 2 particles . These particles have limitations in edible and biodegradable products.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Distribution of Edible Gliadin Nanoparticles at the Air/Water Interface

Peng

Jin

et al. 2017

J. Agric. Food Chem.

View full text Add to dashboard Cite

Edible gliadin nanoparticles (GNPs) were fabricated using the anti-solvent method. They possessed unique high foamability and foam stability. An increasing concentration of GNPs accelerated their initial adsorption speed from the bulk phase to the interface and raised the viscoelastic modulus of interfacial films. High foamability (174.2 ± 6.4%) was achieved at the very low concentration of GNPs (1 mg/mL), which was much better than that of ovalbumin and sodium caseinate. Three stages of adsorption kinetics at the air/water interface were characterized. First, they quickly diffused and adsorbed at the interface, resulting in a fast increase of the surface pressure. Then, nanoparticles started to fuse into a film, and finally, the smooth film became a firm and rigid layer to protect bubbles against coalescence and disproportionation. These results explained that GNPs had good foamability and high foam stability simultaneously. That provides GNPs as a potential candidate for new foaming agents applied in edible and biodegradable products.

show abstract

“…Morphology and size of the PS particles and the bubble microstructures were examined in a dry state by SEM (VE-8800 instrument, Keyence, Osaka, Japan). The contact angle of the PS particles at the air-water interface was evaluated by direct observation after superglue vapor treatment [30][31][32][33][34].…”

Section: Methodsmentioning

confidence: 99%

pH-Dependent Foam Formation Using Amphoteric Colloidal Polymer Particles

et al. 2020

Self Cite

View full text Add to dashboard Cite

Near-monodispersed micrometer-sized polystyrene (PS) particles carrying amidino and carboxyl groups on their surfaces were synthesized by soap-free emulsion polymerization using an amphoteric free radical initiator. The resulting amphoteric PS particles were characterized in terms of diameter, morphology, disperibility in aqueous media and surface charge using scanning electron microscopy (SEM), optical microscopy (OM), sedimentation rate and electrophoretic measurements. At pH 2.0, where the amidino groups are protonated (positively charged), and at pH 11.0, where the carboxyl groups are deprotonated (negatively charged), the PS particles were well dispersed in aqueous media via electrostatic repulsion. At pH 4.8, where the surface charges are neutral, the PS particles were weakly aggregated. Furthermore, it was confirmed that the PS particles can function as a pH-sensitive foam stabilizer: foamability and foam stability were higher at pH 2.0 and 4.8, where the PS particles can be adsorbed to the air–water interface, and lower at pH 11.0, where the PS particles tend to disperse in bulk aqueous medium. SEM and OM studies indicated that hexagonally close-packed arrays of PS particles were formed on the bubble surfaces and moiré patterns were observed on the dried foams. Moreover, the fragments of dried foams showed iridescent character under white light.

show abstract

Aqueous Foams Stabilized with Several Tens of Micrometer-sized Polymer Particles: Effects of Surface Hydrophilic–Hydrophobic Balance on Foamability and Foam Stability

Cited by 12 publications

References 26 publications

pH-Responsive Aqueous Bubbles Stabilized With Polymer Particles Carrying Poly(4-vinylpyridine) Colloidal Stabilizer

pH-Responsive Aqueous Bubbles Stabilized With Polymer Particles Carrying Poly(4-vinylpyridine) Colloidal Stabilizer

Adsorption and Distribution of Edible Gliadin Nanoparticles at the Air/Water Interface

pH-Dependent Foam Formation Using Amphoteric Colloidal Polymer Particles

Contact Info

Product

Resources

About