Tunable thermo-reversible bicontinuous nanoparticle gel driven by the binary solvent segregation

Xi, Yuyin; Lankone, Ronald S.; Sung, Li‐Piin

doi:10.1038/s41467-020-20701-3

Cited by 25 publications

(73 citation statements)

References 36 publications

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“…Nanoparticles dispersed in a binary solvent can thermo-reversibly assemble into solid bicontinuous structures by forming solvent segregation-driven gel (SeedGel) in a scalable, reproducible, and tunable manner 27 , 28 . Different from bicontinuous interfacially jammed emulsion gels (Bijels), where particles have neutral wettability for both components in a binary solvent, particles in SeedGel favor one component of a binary solvent that results in gels consisting of alternating micrometer-sized bicontinuous domains: the particle domain and the solvent domain.…”

Section: Resultsmentioning

confidence: 99%

Finely tunable dynamical coloration using bicontinuous micrometer-domains

Zhang

et al. 2022

Nat Commun

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Nanostructures similar to those found in the vividly blue wings of Morpho butterflies and colorful photonic crystals enable structural color through constructive interference of light waves. Different from commonly studied structure-colored materials using periodic structures to manipulate optical properties, we report a previously unrecognized approach to precisely control the structural color and light transmission via a novel photonic colloidal gel without long-range order. Nanoparticles in this gel form micrometer-sized bicontinuous domains driven by the microphase separation of binary solvents. This approach enables dynamic coloration with a precise wavelength selectivity over a broad range of wavelengths extended well beyond the visible light that is not achievable with traditional methods. The dynamic wavelength selectivity is thermally tunable, reversible, and the material fabrication is easily scalable.

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Section: Resultsmentioning

confidence: 99%

Finely tunable dynamical coloration using bicontinuous micrometer-domains

Zhang

et al. 2022

Nat Commun

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“…Similar behavior was observed for the aggregates of micelles of block-copolymers [ 63 ]. A strong upturn of the scattered intensity at low q (slope > 3) has been reported for various micro-heterogeneous systems as, for instance, polymer melts [ 64 ], percolated nanoemulsion colloidal gels [ 65 ], and bi-continuous nanoparticle gels obtained by solvent segregation [ 66 , 67 ].…”

Section: Resultsmentioning

confidence: 99%

Dual Transient Networks of Polymer and Micellar Chains: Structure and Viscoelastic Synergy

et al. 2021

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Dual transient networks were prepared by mixing highly charged long wormlike micelles of surfactants with polysaccharide chains of hydroxypropyl guar above the entanglement concentration for each of the components. The wormlike micelles were composed of two oppositely charged surfactants potassium oleate and n-octyltrimethylammonium bromide with a large excess of anionic surfactant. The system is macroscopically homogeneous over a wide range of polymer and surfactant concentrations, which is attributed to a stabilizing effect of surfactants counterions that try to occupy as much volume as possible in order to gain in translational entropy. At the same time, by small-angle neutron scattering (SANS) combined with ultrasmall-angle neutron scattering (USANS), a microphase separation with the formation of polymer-rich and surfactant-rich domains was detected. Rheological studies in the linear viscoelastic regime revealed a synergistic 180-fold enhancement of viscosity and 65-fold increase of the longest relaxation time in comparison with the individual components. This effect was attributed to the local increase in concentration of both components trying to avoid contact with each other, which makes the micelles longer and increases the number of intermicellar and interpolymer entanglements. The enhanced rheological properties of this novel system based on industrially important polymer hold great potential for applications in personal care products, oil recovery and many other fields.

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“…Increasing the aspect ratio promoted the formation of interconnected clusters with more notable two-step yield behavior [46]. Such a bicontinuous network can also be formed via phase separation where the size of the domains depends on the rate of the temperature ramp [47,48]. With further additions of secondary liquid, this bicontinuous structure finally collapses, and only isolated capillary clusters are left.…”

Section: Bridge Coalescencementioning

confidence: 99%

The behavior of capillary suspensions at diverse length scales: From single capillary bridges to bulk

Bindgen¹,

Allard²,

Koos

2022

Current Opinion in Colloid & Interface Science

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Liquid-liquid-solid systems are becoming increasingly common in everyday life with many possible applications. Here, we focus on a special case of such liquid-liquid-solid systems, namely, capillary suspensions. These capillary suspensions originate from particles that form a network based on capillary forces and are typically composed of solids in a bulk liquid with an added secondary liquid. The structure of particle networks based on capillary bridges possesses unique properties compared with networks formed via other attractive interactions where these differences are inherently related to the properties of the capillary bridges, such as bridge breaking and coalescence between adjacent bridges. Thus, to tailor the mechanical properties of capillary suspensions to specific requirements, it is important to understand the influences on different length scales ranging from the dynamics of the bridges with varying external stimuli to the often heterogeneous network structure.

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Tunable thermo-reversible bicontinuous nanoparticle gel driven by the binary solvent segregation

Cited by 25 publications

References 36 publications

Finely tunable dynamical coloration using bicontinuous micrometer-domains

Finely tunable dynamical coloration using bicontinuous micrometer-domains

Dual Transient Networks of Polymer and Micellar Chains: Structure and Viscoelastic Synergy

The behavior of capillary suspensions at diverse length scales: From single capillary bridges to bulk

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