Superhydrophobic polyimide aerogels via conformal coating strategy with excellent underwater performances

Li, Xin; Wang, Jin; Zhao, Yibo; Zhang, Xuetong

doi:10.1002/app.48849

Cited by 14 publications

(10 citation statements)

References 49 publications

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“…Nevertheless, it is a challenge for underwater thermal insulation because the convective heat transfer coefficient is ≈3–20 W m −2 K −1 in the air but rises to 100–600 W m −2 K −1 underwater. [ 65 ] Because the TPUAs possess high contact angle and cannot be wetted by water (the hydrostatic pressure of the TPUAs ranged from 0.9 × 10 3 to 5.7 × 10 3 Pa, as shown in Figure S19 ( Supporting Information) as calculated from the Laplace equation according to the literature [ 29 ] ) (Figure 5d), and the performance of the TPUA‐15 is shown in Figure 5f. The cold water was cooled to 17.9 °C, and the thermocouples were covered by the TPUA‐15 and immersed in the cold water.…”

Section: Resultsmentioning

confidence: 99%

Super‐Stretchable Hybrid Aerogels by Self‐Templating Strategy for Cross‐Media Thermal Management

Shan

Wang

et al. 2023

Macromol. Rapid Commun.

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Personal thermal management (PTM) materials have attracted increasing attention owing to their application for personal comfort in an energy-saving mode. However, they normally work in the same media such as in the air, and little is known about what will happen in other media like water. In this study, a system for cross-media thermal management (CMTM): passive cooling in air and thermal insulation underwater is proposed. Hybrid aerogels comprising thermoplastic polyurethane (TPU) matrix and superhydrophobic silica aerogel particle (SSAP) for CMTM are designed and synthesized using a thermally induced phase separation and self-templating strategy. The TPU matrix endows the aerogels with super stretchability (500%), shape memory, and outstanding healing recovery rate (89.9%), which are ideal characteristics for potential wearable usage. Additionally, the TPU and SSAP endow the aerogel with high solar reflectivity and infrared emissivity, thus achieving a sub-ambient cooling of 10.6 °C in air. Moreover, the SSAP endows the aerogels with low thermal conductivity (0.052 W m −1 •K −1 ) and high hydrophobicity (143°), enabling the aerogels for underwater thermal insulation. The CMTM performance of the aerogels makes them for potential uses in cross-media environments such as reefs and islands where cooling in air and thermal insulation in water are required.

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Section: Resultsmentioning

confidence: 99%

Super‐Stretchable Hybrid Aerogels by Self‐Templating Strategy for Cross‐Media Thermal Management

Shan

Wang

et al. 2023

Macromol. Rapid Commun.

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“…polyimide aerogels and aramid aerogel). [54][55][56][57][58] Since most of the ceramics [59,60] are materials with extremely strong ionic bonds or covalent bonds, they have higher melting point, corrosion resistance, oxidation resistance, and heat resistance compared with metals and polymers. Accordingly, ceramics composed of oxides, nitrides, carbides, and their composites, which possess excellent fire/corrosion resistances are the best choices for the construction of HTRAs.…”

Section: Mechanism Of High Temperature Resistancementioning

confidence: 99%

Design, Synthesis, and Use of High Temperature Resistant Aerogels Exceeding 800 oC

Hu¹,

Liu²,

Zhao³

et al. 2021

ES Mater. Manuf.

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As a type of ultra-light and super thermal insulation solid state porous materials, aerogels have attracted increasing attention for aerospace, transportation, and building insulation applications. However, when aerogels are applied in these fields, resistance to high temperature is a prerequisite for them. The most traditional silica aerogels can resist up to 600 ℃, but their porous structures are destroyed at higher temperatures and no longer possess the excellent thermal insulation capacity and low density. Though a great number of new aerogels have been reported in the past two decades, the number of aerogels that could resist to ultra-high temperature, e.g. >800 ℃, is relative few. Nevertheless, it's exciting to see that more and more aerogels that can resist to temperatures higher than 1000 ℃, and even up to 1500 ℃, have been reported in the past few years. This paper gives an overview of aerogels that could resist to more than 800 ℃, and they defined as high temperature resistant aerogels (HTRAs) in this review. The synthetic strategies, mechanisms, chemical compositions, and specific applications of the HTRAs will be reviewed and discussed. This paper would be a timely review to summarized the most recent progress in the HTRAs, and provide insights into the designing of various HTRAs.

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“…As shown in Figure 13(a), a mirror-like layer is clearly observed on the coating surface after immersion, which is owing to the existence of air pockets at the interface between the water and the solid surface. 56,57 Usually, the air pockets are unstable and will gradually be replaced by water. The disappearance of the air pockets will cause the area of the shiny layer to reduce, indicating the decrease of hydrophobicity.…”

Section: The Underwater Durability Of the Superhydrophobic Coatingmentioning

confidence: 99%

One‐step fabrication of wear‐resistant superhydrophobic coating based on aminosilane‐functionalized diatomaceous earth

Liu

Zhang

Zhi

et al. 2021

J of Applied Polymer Sci

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Facile fabrication of superhydrophobic coatings with excellent mechanical robustness is highly desired in practical application. Herein, a convenient and effective strategy for one-step fabrication of robust volumetric superhydrophobic coating was developed containing aminosilane-functionalized cylindrical diatomaceous earth (DE) particles and a polyurethane (PU) resin. Due to the strong chemical cross-linking between the amino groups and the isocyanates, the superhydrophobic DE particles were strongly anchored to the PU resin, thus improving the wear resistance of the coating. The coating could withstand 20 m sandpaper abrasion under a constant pressure of 2.6 kPa. The wear resistance of the coating improved nearly 471% compared with the superhydrophobic DE/PU composite coating prepared by physical-blending. Moreover, the coating also demonstrated great self-cleaning performance, excellent chemical stability and underwater durability. Additionally, the as-prepared coating could be easily applied to various substrates and exhibited high rigidity (3H-4H), good adhesion (4B-5B), and great flexibility (impact resistance of 1 KgÁm).

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Superhydrophobic polyimide aerogels via conformal coating strategy with excellent underwater performances

Cited by 14 publications

References 49 publications

Super‐Stretchable Hybrid Aerogels by Self‐Templating Strategy for Cross‐Media Thermal Management

Super‐Stretchable Hybrid Aerogels by Self‐Templating Strategy for Cross‐Media Thermal Management

Design, Synthesis, and Use of High Temperature Resistant Aerogels Exceeding 800 oC

One‐step fabrication of wear‐resistant superhydrophobic coating based on aminosilane‐functionalized diatomaceous earth

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