The pressing-induced formation of a large-area supramolecular film for oil capture

Wang, Wenkai; Xie, Mengqi; Jin, Hongjun; Zhi, Wanwan; Liu, Kaerdun; Ma, Cheng; Liao, Peilong; Huang, Jianbin; Yan, Yun

doi:10.1039/d0qm00006j

Cited by 16 publications

(21 citation statements)

References 40 publications

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“…Massive generation of the film with controlled film thickness is possible using a roller-type noodle machine. [10,11] The film has good processibility, and its surface is very smooth under SEM (Figure 1B). AFM measurement revealed a roughness Ra ≈ 9.48 nm (Figure S1).…”

Section: Basic Composition and Structurementioning

confidence: 99%

“…The film was made through a pressing-facilitated solid-phase molecular self-assembly (SPMSA) approach recently developed by us. [10,11] A precipitate composed of oppositely charged polyelectrolyte (PE) and surfactant was first generated in water, which would immediately transform into a free-standing supramolecular film under a mild mechanical pressure owing to the merging of the surfactant domains. This free-standing film has excellent hygroscopicity, but water evaporation or absorption on the surface is much faster than the water diffusion in its interior owing to the presence of hydrophobic domains (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

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Solid‐phase molecular self‐assembly facilitated supramolecular films with alternative hydrophobic/hydrophilic domains for skin moisture detection

Wang

et al. 2022

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Human skin moisture is closely related to health and personal care issues. Many creams were developed to claim capable of skin moisturizing. However, people can hardly check their skin moisture status and the moisturizing effect of various creams conveniently, since currently all the skin moisturizing detection rely on large equipment requiring power supply. Herein, we report a power-supply independent supramolecular film that is able to directly report the moisturizing status of the skin. With the strategy of solid-phase molecular self-assembly (SPMSA), the aqueous precipitates formed by commercially available polyelectrolyte and oppositely charged surfactant would transform into a supramolecular film under a mild mechanical pressure, where the hydrophobic surfactant domains bridged by polyelectrolyte merge into hydrophobic mesophases to reduce interfacial energy. The hydrophobic mesophase will greatly retard water diffusion inside the film, so that a humidity gradient is generated as the film is exposed to a humid environment. The film will bend upward automatically in touch with moisture skin, and the bending degree is proportional to the skin moisture status. Therefore, the film can be used as portable smart power-free skin moisture sensor.

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Section: Basic Composition and Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solid‐phase molecular self‐assembly facilitated supramolecular films with alternative hydrophobic/hydrophilic domains for skin moisture detection

Wang

et al. 2022

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“…However, so far most molecular self-assemblies are obtained in the form of solution-based colloidal dispersions. − This solution-based molecular self-assembly is hard to work with when bulk macroscopic materials are required . To tackle this problem, we recently developed a strategy of solid-phase molecular self-assembly (SPMSA), − with which supramolecular films can be obtained at large scales . This not only allows the preparation of noncolloidal form self-supporting macroscopic molecular self-assembled materials but also makes it possible to achieve diversified functions. − ,, …”

Section: Introductionmentioning

confidence: 99%

Physical Insight into the Conditions Required in the Solid-Phase Molecular Self-Assembly of SDS Revealed by Coarse-Grained Molecular Dynamics Simulation

Dou

Jin

et al. 2022

J. Phys. Chem. B

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Molecular self-assembled materials have attracted considerable interest in recent years. As part of the efforts to overcome the shortcoming that the solution-based methods were hardly applicable in preparing bulk macroscopic molecular self-assemblies, Yan Yan CCS Chem.2020298106 developed a strategy of solid-phase molecular self-assembly (SPMSA) that allows scaling up the generation of massive supramolecular films. It is highly desired to understand the physical insight into the SPMSA at a molecular level. Here, in combination with the experimental study, we report molecular dynamics (MD) simulations on the SPMSA of the surfactant sodium dodecyl sulfate (SDS) using a coarse-grained method with the Martini force field model. The MD simulations clearly manifest that a small amount of water is required to endow the SDS molecules with sufficient mobility to self-assemble, and the smaller size of the preassembled SDS particles favors their further fusion into mesophases by reducing the total surface Gibbs free energy, while the smaller interparticle distance decreases the time for the particle fusion. The simulation results agree well with the conditions required in the experiment, confirming that SMPSA is a free-energy-favored process leading to bulk self-assembled materials.

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“…Herein, we report the creation of CNT-doped supramolecular film sensors using the strategy of solid-phase molecular self-assembly (SPMSA) recently developed in our lab. , In this strategy, a precipitate is created from the aqueous solution of oppositely charged surfactant and polyelectrolyte. Under mechanical pressure, the precipitate will transform into a continuous supramolecular film owing to the merging of the surfactant domains bridged by the polyelectrolyte chains.…”

Section: Introductionmentioning

confidence: 99%

Wearable Sensors Based on Solid-Phase Molecular Self-Assembly: Moisture-Strain Dual Responsiveness Facilitated Extremely High and Damage-Resistant Sensitivity

Gao

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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Wearable sensing technologies have gained increasing interest in biomedical fields because they are convenient and could efficiently monitor health conditions by detecting various physiological signals in real time. However, common film sensors often neglect body moisture and enhance the sensitivity by enhancing the conductive dopants and self-healing ability. We report in this work a supramolecular film sensor based on solid-phase molecular self-assembly (SPMSA), which smartly utilizes the body moisture to enhance the sensitivity for human-machine interaction. The carbon nanotube (CNT)-doped SPMSA film is able to capture environmental moisture quickly. Upon contact to human skin, the moisture not only promotes the junction between CNTs but also contributes to the conductivity. As a result, the sensitivity can be enhanced 4 times. In this way, we are able to obtain the highest sensitivity of 700% with the lowest CNT doping rate of 0.5%. Furthermore, the current sensor displays damage-inert sensing performance. In the presence of a hole of up to 50% of the film area, the sensitivity remains unaffected due to the decreases in the absolute conductivity of the film sensor before and after a trigger to the same extent. In this way, we have developed a new principle in the design of a film sensor for human-machine interaction, which releases the sensor from focus on promoting conductivity and self-healing materials.

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The pressing-induced formation of a large-area supramolecular film for oil capture

Abstract: A rejuvenable large-area polyelectrolyte–surfactant supramolecular film formed by applying pressure can be used in a recyclable manner to rapidly capture spilled oil.

Cited by 16 publications

References 40 publications

Solid‐phase molecular self‐assembly facilitated supramolecular films with alternative hydrophobic/hydrophilic domains for skin moisture detection

Solid‐phase molecular self‐assembly facilitated supramolecular films with alternative hydrophobic/hydrophilic domains for skin moisture detection

Physical Insight into the Conditions Required in the Solid-Phase Molecular Self-Assembly of SDS Revealed by Coarse-Grained Molecular Dynamics Simulation

Wearable Sensors Based on Solid-Phase Molecular Self-Assembly: Moisture-Strain Dual Responsiveness Facilitated Extremely High and Damage-Resistant Sensitivity

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