Natural sedimentation-assisted fabrication of Janus functional films for versatile applications in Joule heating, electromagnetic interference shielding and triboelectric nanogenerator

Li, Weiyan; Song, Zhitang; He, Ying; Li, Xianqing; Yu, Bao; Wang, Wei; Sun, Zhonghui; Ma, Yingming; Liu, Zhenbang; Niu, Libo

doi:10.1016/j.cej.2022.140606

Cited by 4 publications

(2 citation statements)

References 53 publications

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“…Such asymmetric films are called “Janus” films or membranes, after the Roman deity with two faces. These proved useful in a plethora of new applications, such as elements for self-adaptive and pneumatic multifunctional electronics [ 14 ], triboelectric nanogenerators [ 15 ], fabrication of membranes with asymmetric wettability, but also in typical membrane applications microfiltration, ultrafiltration [ 16 ], membrane distillation, reverse osmosis, etc., showing superior performance in oil/water separations because, in theory, a Janus membrane can spontaneously achieve unidirectional liquid transport [ 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Asymmetrically Nanostructured 2D Janus Films Obtained from Pickering Emulsions Polymerized in a Langmuir–Blodgett Trough

Honciuc¹,

Negru²

2023

Micromachines

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Low-dimensional structures, such as two-dimensional (2D) Janus films, can be useful in studying fundamental interactions or in applications at the nanoscale. In this work, we report the fabrication of 2D polymer Janus films consisting of one smooth and another nanostructured facet on which silica nanoparticles (NPs) are self-assembled in a compact monolayer shield. The 2D films are made from Pickering emulsions of monomers in water, stabilized by NPs, which are spread over the surface of the water in a Langmuir–Blodgett trough. Following the spreading of the colloidosomes, oil droplets stabilized by NPs collapse, and the interfaces reorganize such that the NP monolayer is found exclusively at the oil/water interface. Upon compression followed by UV polymerization, a 2D solid film is formed, with one smooth and another nanostructured face. The film can be removed from the surface of the water and handled with tweezers. The 2D films exhibit different surface properties on the two sides, such as differences in water wettability. On the nanostructured side, water wettability can be tuned by tuning the surface energy of the nanoparticles, namely by changing their surface functional groups. Upon removal of NPs, the surface can be patterned with an array of circular traces.

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Section: Introductionmentioning

confidence: 99%

Asymmetrically Nanostructured 2D Janus Films Obtained from Pickering Emulsions Polymerized in a Langmuir–Blodgett Trough

Honciuc¹,

Negru²

2023

Micromachines

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“…Several works showed the promise of these kinds of functional materials, but their EMI performance is still low (∼30 dB) or the thickness is large (500 μm, ∼50 dB) [ [172] , [173] , [174] , [175] ]. We expect researchers to focus on the EMI shielding ability of devices while maintaining enough healing properties by improving the interfacial connection between fillers and shape-memory polymers of flexible-compatible composite films, or high-power density for triboelectric nanogenerators [ 176 ].…”

Section: Discussionmentioning

confidence: 99%

Recent advances in multifunctional electromagnetic interference shielding materials

Nguyen,

Choi

2024

Heliyon

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Janus CoMOF‐SEBS Membrane for Bifunctional Dielectric Layer in Triboelectric Nanogenerators

Yoo,

Mahato,

Kim

et al. 2024

Advanced Science

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Considerable research has been conducted on the application of functional nano‐fillers to enhance the power generation capabilities of triboelectric nanogenerators (TENGs). However, these additives often exhibit a decrease in output power at higher concentration. Here, a Janus cobalt metal–organic framework‐SEBS (JCMS) membrane is reported as a dual‐purpose dielectric layer capable of efficiently capturing and blocking charges for high‐performance TENGs. The JCMS is produced asymmetrically through gravitational sedimentation, employing spherical CoMOFs within a diluted SEBS solution. Beyond its dual dielectric characteristics, the JCMS showcases exceptional mechanical durability, displaying notable stretchability of up to 475% and remarkable resilience when subjected to diverse mechanical pressures. Consequently, the JCMS‐TENG produces a maximum peak‐to‐peak voltage of 936 V, a current of 42.8 µA, and a power density of 10.89 W m−2 when exposed to an external force of 10 N at a 5 Hz frequency. This investigation highlights the potential of JCMS‐TENGs with unique structures, known for their exceptional energy harvesting capabilities, mechanical strength, and flexibility. Additionally, the promising prospects of easily produced asymmetric structures is emphasized with bifunctionalities for developing efficient and flexible MOFs‐based TENGs. These advancements are well‐suited for self‐powered wearables, rehabilitation devices, and energy harvesters.

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Natural sedimentation-assisted fabrication of Janus functional films for versatile applications in Joule heating, electromagnetic interference shielding and triboelectric nanogenerator

Cited by 4 publications

References 53 publications

Asymmetrically Nanostructured 2D Janus Films Obtained from Pickering Emulsions Polymerized in a Langmuir–Blodgett Trough

Asymmetrically Nanostructured 2D Janus Films Obtained from Pickering Emulsions Polymerized in a Langmuir–Blodgett Trough

Recent advances in multifunctional electromagnetic interference shielding materials

Janus CoMOF‐SEBS Membrane for Bifunctional Dielectric Layer in Triboelectric Nanogenerators

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