The Assembly and Jamming of Nanoparticle Surfactants at Liquid–Liquid Interfaces

Wang, Beibei; Yin, Bangqi; Zhao, Zhongwei; Yin, Yixuan; Yang, Yang; Wang, Haiqiao; Russell, Thomas P.; Shi, Shaowei

doi:10.1002/anie.202114936

Cited by 33 publications

(19 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The S/W interface can support the assembly of particles that diffuse and stabilize the interface, opening the possibility for the design of functional soft materials, [ 53 ] for instance, by Pickering emulsion stabilization. [ 54 ] We observed that with the evaporation of the solvent, betulin crystallized in situ (Figure 5F), and the crystals stabilized the S/W interface. The solvent/water (L/L) interfacial tension γ of betulin (0.8% concentration) was determined with the pendant drop technique.…”

Section: Resultsmentioning

confidence: 99%

Betulin Self‐Assembly: From High Axial Aspect Crystals to Hedgehog Suprastructures

Niu

Foster

Patrick

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Betulin is introduced as a building block of supramolecular structures that form by noncovalent interactions. Betulin, an abundant triterpene, is first extracted from birch bark to self-assemble into hierarchical crystalline structures. Following a direct bottom-up process, solvatomorphs of betulin-2-propanol form high axial aspect microparticles, 100-300 µm in length, and lateral sizes in the 15-40 µm range. Under sonication, the microparticles evolve into 3D hedgehog suprastructures (15-30 µm in size) comprising a core (3-5 µm diameter) with connected spines (200-300 nm in width). Depending on the intensity of the delivered energy, the associated morphogenesis starts with metastable aggregates that undergo dislocation, solvent migration, and radial growth. It is found that the formed spherulite-like, hedgehog structures are a consequence of residual solvent diffusion, leading to crystallites with oriented attachment on specific planes. These results add to the design of structures from natural building blocks, which are expected to deliver functions encoded in the respective morphology. Owing to the unique features of betulin supraparticles, they develop surface architectures, for instance, in superhydrophobic coatings, which are shown to exhibit exceptional repellency and surface mechanical strength, as tested on various substrates.

show abstract

Section: Resultsmentioning

confidence: 99%

Betulin Self‐Assembly: From High Axial Aspect Crystals to Hedgehog Suprastructures

Niu

Foster

Patrick

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…Introducing host–guest chemistry of macrocycles into liquid‐liquid interfaces provides an alternative strategy to prepare structured liquids with multiple stimuli‐responsiveness, [21–23] due to the self‐selectivity and environmental responsiveness of host–guest interactions. Very recently, by using the host–guest interactions between α‐cyclodextrin modified NPs and azobenzene‐terminated polymeric ligands, [24] or β‐cyclodextrin modified NPs and ferrocene‐terminated polymeric ligands, [25] NPSs and structured liquids with photo or redox responsiveness have been constructed.…”

Section: Figurementioning

confidence: 99%

Reconfigurable Liquids Constructed by Pillar[6]arene‐Based Nanoparticle Surfactants

et al. 2022

Self Cite

View full text Add to dashboard Cite

The interfacial jamming of nanoparticle surfactants offers the possibility of structuring liquids and fabricating all‐liquid constructs with advanced functionality. However, less attention has been given to structured liquids with multiple responsiveness. Here, we show a novel, yet highly simplified nanoparticle surfactant model, pillar[6]arene (PA[6]) surfactant, by taking advantage of the host–guest interactions between a water‐soluble PA[6] and an oil‐soluble ligand, ferrocenium terminated polystyrene. PA[6] surfactants form rapidly at the oil–water interface, assemble into an elastic film with excellent mechanical strength, and when jammed, offer a “solid‐like” assembly to lock‐in highly nonequilibrium shapes of the liquids. The interfacial assembly/jamming and disassembly/unjamming of PA[6] surfactants can be controlled by chemical redox or competitive guest reagents, endowing the structured liquids with redox or guest‐competitive responsiveness.

show abstract

“…[ 10 ] Moreover, by functionalizing the surface of the NPs and the ligands with different types of complementary groups, for example, cation‐anion pairs or cyclodextrin‐based host−guest recognition motifs, multiple stimuli responsiveness including pH, photo, and redox can be integrated into the NPSs and, the resultant interfacial assemblies. [ 11–14 ] However, despite these achievements based on NPSs, the exploration of other noncovalent interactions at the oil‐water interface is still limited. It is also challenging to stabilize or structure the interface as the NP size decreases to the molecular level, i.e., small molecules, due to the very low binding energy, unless the small molecules interact with each other, forming an aggregate, either in solution or at the interface, and transforming the size scale of the unit adsorbed to the interface.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular Interfaces and Reconfigurable Liquids Derived from Cucurbit[7]uril Surfactants

Sun

Luo

Yang

et al. 2022

Small

Self Cite

View full text Add to dashboard Cite

Nanoparticle surfactants (NPSs) offer a powerful means to stabilize the oil‐water interface and construct all‐liquid devices with advanced functions. However, as the nanoparticle size decreases to molecular‐scale, the binding energy of the NPS to the interface reduces significantly, leading to a dynamic adsorption of NPS and “liquid‐like” state of the interfacial assemblies. Here, by using the host‐guest recognition between a water‐soluble small molecule, cucurbit[7]uril (CB[7]) and an oil‐soluble polymer ligand, methyl viologen‐terminated polystyrene, a supramolecular NPS model, termed CB[7] surfactant, is described. CB[7] surfactants form and assemble rapidly at the oil‐water interface, generating an elastic film with excellent mechanical properties. The binding energy of CB[7] surfactant to the interface is sufficiently high to hold it in a jammed state, transforming the interfacial assemblies from a “liquid‐like” to “solid‐like” state, enabling the structuring of liquids. With CB[7] surfactants as the emulsifier, O/W, W/O and O/W/O emulsions can be prepared in one step. Owing to the guest‐competitive responsiveness of CB[7] surfactants, the assembly/disassembly and jamming/unjamming of CB[7] surfactants can be well controlled, leading to the reconfiguration of all‐liquid constructs.

show abstract

The Assembly and Jamming of Nanoparticle Surfactants at Liquid–Liquid Interfaces

Cited by 33 publications

References 43 publications

Betulin Self‐Assembly: From High Axial Aspect Crystals to Hedgehog Suprastructures

Betulin Self‐Assembly: From High Axial Aspect Crystals to Hedgehog Suprastructures

Reconfigurable Liquids Constructed by Pillar[6]arene‐Based Nanoparticle Surfactants

Supramolecular Interfaces and Reconfigurable Liquids Derived from Cucurbit[7]uril Surfactants

Contact Info

Product

Resources

About