Self-Assembly of Polystyrene-<i>b</i>-poly(2-vinylpyridine)/Chloroauric Acid at the Liquid/Liquid Interface

Liu, Yuwei; Cui, Xiaona; Lee, Yong‐Ill; Liu, Hong-Guo

doi:10.1021/acs.langmuir.1c03338

Cited by 7 publications

(2 citation statements)

References 49 publications

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“…The HCl treatment reduced the SR, but the SR was restored to that of the pristine film by treating with 0.1 wt % KOH for 30 min. This suggests that the suppression of the SR is due to protonation of the P2VP blocks by acid immersion, which increases their hydrophilicity − and reduces the subsequent uptake of chloroform. We therefore draw two conclusions.…”

Section: Resultsmentioning

confidence: 99%

Reversible Morphology Locking via Metal Infiltration in a Block Copolymer

Liu

et al. 2023

ACS Nano

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Metal infiltration from an acid solution of a metal precursor into the poly(2-vinylpyridine) (P2VP) microdomains of a polystyrene-b-P2VP block copolymer is shown to reduce the uptake of solvent vapor during a subsequent solvent annealing process, locking the morphology of the self-assembled microdomains. The amount of metal, here Pt, incorporated into the P2VP increases with both metal precursor [PtCl4]2– and hydrochloric acid concentrations, reaching 0.83 Pt atom per pyridine unit. The metal is then exfiltrated using a KOH + ethylenediaminetetraacetic acid disodium salt dihydrate (Na2EDTA) complexing solution, which restores solvent uptake and unlocks the morphology. The reversibility of the metal infiltration and morphology locking is demonstrated in a multistage annealing process and is confirmed for Fe as well as Pt. Reversible locking and unlocking of block copolymer microdomain morphologies expand their utility for nanofabrication processes by allowing the morphology to be fixed during subsequent process steps.

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Section: Resultsmentioning

confidence: 99%

Reversible Morphology Locking via Metal Infiltration in a Block Copolymer

Liu

et al. 2023

ACS Nano

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“…Considering that the anisotropic wet adhesion requires an adhesive to have strong interactions with substrate but anisotropic low internal cohesion, we propose to introduce amphiphilic molecules into wet adhesives, since the amphiphile would form hydrophobic domains which would offer weak cohesion forces. In the past decades, amphiphiles have been extensively utilized to create various self-assembled structures which possess micro-environments with different polarities [24][25][26] . It is well-known that the van der Waals forces are often the dominant interactions between the organic groups in the hydrophobic domains, whereas hydrogen bonding or electrostatic interactions are often those in hydrophilic domains.…”

Section: Introductionmentioning

confidence: 99%

Reversible Anisotropic Wet Adhesion Enabled by Rigid Amphiphiles

Gao

Zhao

et al. 2023

Preprint

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Wet adhesives such as glues are extensively used in everyday life and various engineering processes to integrate two different objects together. Usually a firm adhesion is desired in all applications, but the strong adhesion often brings up difficulties in revising an undesired adhesion or reusing the adhered objects. To solve this dilemma, we report an anisotropic wet adhesive that combine the advantages of strong adhesion and easy deadhesion together by incorporating a rigid amphiphile glycyrrhizic acid (GA) and a flexible polyelectrolyte poly (diallyldimethylammonium) chloride (PDDA) into the glue. The rigidity of the GA molecules allows formation of oriented hydrophobic GA bilayers on smooth surfaces under the mild pressure required for adhesion. The van der Waals forces between the hydrophobic chains are much weaker than hydrogen bonds, coordination, and electrostatic forces occurred between the glue and the adhered substrate. As a result, the shear force along the hydrophobic chain, which is vertical to the surface, is 6 ~ 13 times smaller than that along the surface. This immediately generates an anisotropic adhesion, which makes it possible to revise or detach an undesired adhesion by applying a gentle pulling force vertical to the surface. Reversible adhesion is possible by pressing back the detached part, and the undesired adhesives can be facilely cleaned with water. As the GA molecule is replaced by other rigid ones, similar anisotropic adhesion is observed. We envision the rigid molecules facilitated anisotropic wet glue would open a new paradigm in developing smart wet adhesives for building sustainable societies.

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Liquid–Liquid Interfacial Nanoarchitectonics

Ariga

2023

Small

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Science in the small world has become a crucial key that has the potential to revolutionize materials technology. This trend is embodied in the postnanotechnology concept of nanoarchitectonics. The goal of nanoarchitectonics is to create bio‐like functional structures, in which self‐organized and hierarchical structures are working efficiently. Liquid–liquid interface like environments such as cell membrane surface are indispensable for the expression of biological functions through the accumulation and organization of functional materials. From this viewpoint, it is necessary to reconsider the liquid–liquid interface as a medium where nanoarchitectonics can play an active role. In this review, liquid–liquid interfacial nanoarchitectonics is classified by component materials such as organic, inorganic, carbon, and bio, and recent research examples are discussed. Examples discussed in this paper include molecular aggregates, supramolecular polymers, conductive polymers film, crystal‐like capsules, block copolymer assemblies, covalent organic framework (COF) films, complex crystals, inorganic nanosheets, colloidosomes, fullerene assemblies, all‐carbon π‐conjugated graphite nanosheets, carbon nanoskins and fullerphene thin films at liquid–liquid interfaces. Furthermore, at the liquid–liquid interface using perfluorocarbons and aqueous phases, cell differentiation controls are discussed with the self‐assembled structure of biomaterials. The significance of liquid–liquid interfacial nanoarchitectonics in the future development of materials will then be discussed.

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Self-Assembly of Polystyrene-b-poly(2-vinylpyridine)/Chloroauric Acid at the Liquid/Liquid Interface

Cited by 7 publications

References 49 publications

Reversible Morphology Locking via Metal Infiltration in a Block Copolymer

Reversible Morphology Locking via Metal Infiltration in a Block Copolymer

Reversible Anisotropic Wet Adhesion Enabled by Rigid Amphiphiles

Liquid–Liquid Interfacial Nanoarchitectonics

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