Biomimetic nanocoatings with exceptional mechanical, barrier, and flame-retardant properties from large-scale one-step coassembly

Ding, Fuchuan; Liu, Jingjing; Zeng, Songshan; Xia, Yan; Wells, Kacie M.; Nieh, Mu‐Ping; Sun, Luyi

doi:10.1126/sciadv.1701212

Cited by 215 publications

(205 citation statements)

References 59 publications

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“…However, most of these coating techniques depend on tedious conditions and require special skills, so it is difficult to meet practical requirements . Nanoparticles including clay and carbon nanotubes significantly improve flame retardancy of PUF via LbL coating process …”

Section: Introductionmentioning

confidence: 99%

Two in One: Modified Polyurethane Foams by Dip‐Coating of Halloysite Nanotubes with Acceptable Flame Retardancy and Absorbency

Zheng

et al. 2019

Macro Materials & Eng

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Poor flame retardancy of polyurethane foam (PUF) limits its practical application in many fields. Here, flame‐retardant performance of PUF is improved by a simple dip‐coating method. Halloysite nanotube (HNT) coating can be uniformly bonded to PUF surfaces via hydrogen‐bonding interactions, which is confirmed by element mapping and X‐ray photoelectron spectra. Density and mechanical properties of PUF increase with the concentration of HNT suspension, while porosity of the foam decreases with HNT loading. Weight ratio of HNTs to PUF in the composite can be achieved as high as 65.2%. Surfaces of PUF transfer from hydrophobic to super‐hydrophilic after HNT coating, and the water contact angle decreases from 116° to 0° after HNT coating. As a result, methylene blue adsorption capacity of HNTs‐coated PUF increases from 0.02 to 0.15 mg g−1, and adsorption efficiency can reach 98% after 10 s. HNT coating can prevent PUF from burning and dripping, which suggests that flame‐retardant performance of PUF is significantly improved by HNTs. This work establishes a general procedure for improving flame retardancy and dye absorbency of polymer materials by simple dip‐coating of environmental‐friendly clay nanotubes, which shows great potential in high‐performance polymer and functional composite materials.

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Section: Introductionmentioning

confidence: 99%

Two in One: Modified Polyurethane Foams by Dip‐Coating of Halloysite Nanotubes with Acceptable Flame Retardancy and Absorbency

Zheng

et al. 2019

Macro Materials & Eng

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“…According to Cussler, the barrier improvement factor is nonlinearly dependent on both aspect ratio and filler content. Consequently, it is most efficient and material‐saving to apply fillers with the highest aspect ratio accessible and at the maximum filler level that can be processed . Melt synthesized hectorites come in diameters of up to 20 µm and moreover can be utterly delaminated into 1 nm thick nanosheets by repulsive osmotic swelling simply by immersing them into water .…”

Section: Introductionmentioning

confidence: 99%

Filter‐Through Method of Making Highly Efficient Polymer‐Clay Nanocomposite Membranes

Zhu

Habel

Schilling

et al. 2019

Macro Materials & Eng

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Electrospun filter with hierarchical pore structure and variable pore diameter is used for the first time in making a flexible, strong, and high gas‐barrier membrane. A versatile, technical, benign processing method for the fabrication of highly filled (>25 wt%) efficient gas‐barrier polymer membrane with perfectly aligned synthetic high‐aspect ratio layered silicate (clay) of variable and considerable thickness (up to 5 µm) is presented. This process combines advantageous features of an electrospun substrate like high porosity, variable pore size (typically <5 µm), thermoplasticity and of an aqueous suspension of a synthetic clay consisting of single 1 nm thick layers with a huge median lateral extension (>10 µm) in a layered structure. By simple and fast filtration, a gas‐barrier self‐assembled layer of variable and appropriate thickness is obtained on a mechanically stable thermoplastic electrospun filter support that subsequently can be laminated adhesively or via hot pressing, even in a multilayer structure, if required. The resulting composite membranes are flexible, strong, transparent, and show enhanced gas‐barrier properties.

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“…In this paper, we report a facile and effective approach to prepare intumescent flame retardant and hydrophobic coating via in situ sol-gel and self-assembly techniques, which can be applied onto cotton fabrics via a single step coating process [33]. The superhydrophobicity of cotton fabrics can not only bring the common benefits as listed above, but also help minimize the need of washing, as well as improve the washing durability of the coated cotton fabrics, thus particularly beneficial for maintaining the flame retardancy.…”

Section: Introductionmentioning

confidence: 99%

Flame retardant and hydrophobic cotton fabrics from intumescent coatings

Zhang

Williams

Becher

et al. 2017

Adv Compos Hybrid Mater

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Intumescent flame retardant and hydrophobic coatings, consisting of sodium montmorillonite (MMT), am moniu m d ihy dro gen ph os pha te ( ADP), an d methyltrimethoxysilane (MTMS), were prepared via in situ sol-gel and self-assembly techniques to acquire multifunctional cotton fabrics. The impact of MTMS concentration on hydrophobicity, fire resistance, thermal stability, and heat release behavior of the coated fabrics was investigated. A Si-O-Si network structure was generated via the hydrolysis-condensation reaction of MTMS, induced by the catalysis of ADP. After treated by the coating with 2.0 wt.% of MTMS, the cotton fabric with a total uptake of 22.7 wt.% achieved appreciable flame retardancy and hydrophobicity, as well as satisfactory thermal stability and heat release behaviors. Overall, this research provides a facile and effective approach to prepare flame retardant and hydrophobic cotton fabrics.

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Biomimetic nanocoatings with exceptional mechanical, barrier, and flame-retardant properties from large-scale one-step coassembly

Abstract: Nanocoatings with exceptional mechanical, barrier, and flame-retardant properties were fabricated via one-step coassembly.

Cited by 215 publications

References 59 publications

Two in One: Modified Polyurethane Foams by Dip‐Coating of Halloysite Nanotubes with Acceptable Flame Retardancy and Absorbency

Two in One: Modified Polyurethane Foams by Dip‐Coating of Halloysite Nanotubes with Acceptable Flame Retardancy and Absorbency

Filter‐Through Method of Making Highly Efficient Polymer‐Clay Nanocomposite Membranes

Flame retardant and hydrophobic cotton fabrics from intumescent coatings

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