A broad perspective to particle-laden fluid interfaces systems: from chemically homogeneous particles to active colloids

Guzmán, Eduardo; Martínez‐Pedrero, Fernando; Calero, Carles; Maestro, Armando; Ortega, Francisco; Rubio, Ramón G.

doi:10.1016/j.cis.2022.102620

Cited by 41 publications

(66 citation statements)

References 497 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… 23 When two deformed microgels are forced into close proximity, their size and shape changed irreversibly resulting in a reduced surface tension after several cyclings of between 20 and 40 °C. However, the polymer-L.SEC particles adsorbed at the interface according to the Young–Dupré relationship, 24 endowing them with reversible chemical structural and morphological transition that further ensure a more flexible interaction between water and the stable interparticle interaction compared to the microgel. Therefore, the polymer-L.SEC particles are good candidates for the construction of thermo-responsive surfaces to achieve a tunable and reversible wettability transition.…”

Section: Resultsmentioning

confidence: 99%

Topographical Design and Thermal-Induced Organization of Interfacial Water Structure to Regulate the Wetting State of Surfaces

Wang

Zhao

Han

et al. 2022

JACS Au

View full text Add to dashboard Cite

Smart surfaces with superhydrophobic/superhydrophilic characteristics can be controlled by external stimuli, such as temperature. These transitions are attributed to the molecular-level conformation of the grafted polymer chains due to the varied interactions at the interface. Here, tunable surfaces were prepared by grafting two well-known thermo-responsive polymers, poly( N -isopropylacrylamide) (PNIPAM) and poly(oligoethylene glycol)methyl ether acrylate (POEGMA 188 ) onto micro-pollen particles of uniform morphology and roughness. Direct Raman spectra and thermodynamic analyses revealed that above the lower critical solution temperature, the bonded and free water at the interface partially transformed to intermediate water that disrupted the “water cage” surrounding the hydrophobic groups. The increased amounts of intermediate water produced hydrogen bonding networks that were less ordered around the polymer grafted microparticles, inducing a weaker binding interaction at the interface and a lower tendency to wet the surface. Combining the roughness factor, the bulk surface assembled by distinct polymer-grafted-pollen microparticles (PNIPAM or POEGMA 188 ) could undergo a different wettability transition for liquid under air, water, and oil. This work identifies new perspectives on the interfacial water structure variation at a multiple length scale, which contributed to the temperature-dependent surface wettability transition. It offers inspiration for the application of thermo-responsive surface to liquid-gated multiphase separation, water purification and harvesting, biomedical devices, and printing.

show abstract

Section: Resultsmentioning

confidence: 99%

Topographical Design and Thermal-Induced Organization of Interfacial Water Structure to Regulate the Wetting State of Surfaces

Wang

Zhao

Han

et al. 2022

JACS Au

View full text Add to dashboard Cite

show abstract

“…From a practical point of view, O/W emulsions are formed at 15 • < θ < 90 • , whereas the stabilization of W/O requires 90 • < θ < 165 • . Therefore, partial wetting for both phases is essential for stabilizing Pickering emulsions, and hence, particles fully wetted by one of the phases do not allow the stabilization of particle-stabilized emulsions [26,29]. It should be noted that in recent years, the research on multiple emulsions (oil-in-water-in-oil or water-in-oil-in water) or oil-in-oil emulsions has undergone a strong development [30,31].…”

Section: Understanding the Stabilization Of Emulsions By Colloidal Pa...mentioning

confidence: 99%

“…Firstly, the size of the droplets increases by flocculation, coalescence or Ostwald ripening, and then when the droplets reach a critical dimension, the gravitational forces start to operate, driving the formation of phase-separated liquid layers [3]. The minimization of the destabilization events is possible by a correct choice of the emulsifier substance, or the emulsion rheology, to produce emulsions with a narrow distribution of the size of the droplets [29]. It should be noted that together with the physical stability evaluated by the absence of phase separation and coarsening, the preparation of cosmetic emulsions should present chemical and microbiological stabilities [7].…”

Section: Destabilization Mechanisms Of Emulsionsmentioning

confidence: 99%

Pickering Emulsions: A Novel Tool for Cosmetic Formulators

2022

Self Cite

View full text Add to dashboard Cite

The manufacturing of stable emulsion is a very important challenge for the cosmetic industry, which has motivated intense research activity for replacing conventional molecular stabilizers with colloidal particles. These allow minimizing the hazards and risks associated with the use of conventional molecular stabilizers, providing enhanced stability to the obtained dispersions. Therefore, particle-stabilized emulsions (Pickering emulsions) present many advantages with respect to conventional ones, and hence, their commercialization may open new avenues for cosmetic formulators. This makes further efforts to optimize the fabrication procedures of Pickering emulsions, as well as the development of their applicability in the fabrication of different cosmetic formulations, necessary. This review tries to provide an updated perspective that can help the cosmetic industry in the exploitation of Pickering emulsions as a tool for designing new cosmetic products, especially creams for topical applications.

show abstract

“…The assembly of colloidal particles at fluid interfaces is currently exploited in a broad range of industrial and technological fields, ranging from food, oil, and cosmetic industries to pharmaceutical formulations, and from the manufacturing of advanced coatings to biomedical applications [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. In particular, the use of soft colloidal particles gained importance in the above applications in recent years [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Soft Colloidal Particles at Fluid Interfaces

Guzmán

Maestro

2022

Polymers

Self Cite

View full text Add to dashboard Cite

The assembly of soft colloidal particles at fluid interfaces is reviewed in the present paper, with emphasis on the particular case of microgels formed by cross-linked polymer networks. The dual polymer/colloid character as well as the stimulus responsiveness of microgel particles pose a challenge in their experimental characterization and theoretical description when adsorbed to fluid interfaces. This has led to a controversial and, in some cases, contradictory picture that cannot be rationalized by considering microgels as simple colloids. Therefore, it is necessary to take into consideration the microgel polymer/colloid duality for a physically reliable description of the behavior of the microgel-laden interface. In fact, different aspects related to the above-mentioned duality control the organization of microgels at the fluid interface, and the properties and responsiveness of the obtained microgel-laden interfaces. This works present a critical revision of different physicochemical aspects involving the behavior of individual microgels confined at fluid interfaces, as well as the collective behaviors emerging in dense microgel assemblies.

show abstract

A broad perspective to particle-laden fluid interfaces systems: from chemically homogeneous particles to active colloids

Cited by 41 publications

References 497 publications

Topographical Design and Thermal-Induced Organization of Interfacial Water Structure to Regulate the Wetting State of Surfaces

Topographical Design and Thermal-Induced Organization of Interfacial Water Structure to Regulate the Wetting State of Surfaces

Pickering Emulsions: A Novel Tool for Cosmetic Formulators

Soft Colloidal Particles at Fluid Interfaces

Contact Info

Product

Resources

About