Ultralight open cell polymer sponges with advanced properties by PPX CVD coating

Duan, Gaigai; Jiang, Shaohua; Moss, Tobias; Agarwal, Seema

doi:10.1039/c6py00339g

Cited by 47 publications

(52 citation statements)

References 22 publications

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“…Furthermore, pullulan—a homopolysaccharide of glucose—is biodegradable, GRAS‐approved, and amphiphilic, because of the presence of hydrophilic hydroxyls groups and hydrophobic pyranose rings. In contrast to the hydrophobic nanofiber aerogels prepared by Ding and co‐workers[5a,22] and Greiner and co‐workers, the amphiphilic character of pullulan allows the uptake of both polar and nonpolar solvents. Additionally, the presence of ample hydroxyl groups facilitates chemical post modification .…”

Section: Archimedean Densities Of the Green Body The Cross‐linked Aementioning

confidence: 97%

“…Adding supporting inorganic nanofibers such as SiO 2 can preserve the initial volume during thermal cross‐linking at the cost of the biodegradable properties of the aerogels. [5a,22] Likewise, using polymeric or inorganic coatings to enhance the stability of the aerogels leads to a loss of the intrinsic surface properties of the fibers …”

Section: Archimedean Densities Of the Green Body The Cross‐linked Aementioning

confidence: 99%

“…d) Scaling behavior of nanofiber‐based aerogels with different densities. Literature data:[5a,23,30c,34a,39] The nanofiber‐based aerogels from this work show open‐cell behavior (slope 2.1). E s and density ρ s of the solid were estimated using literature values of pullulan and PVA: E pullulan = 28 GPa, ρ pullulan = 1.85 mg mL −1 and E PVA = 46 GPa, ρ PVA = 1.19 mg mL −1 , respectively.…”

Section: Archimedean Densities Of the Green Body The Cross‐linked Aementioning

confidence: 99%

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Amphiphilic Nanofiber‐Based Aerogels for Selective Liquid Absorption from Electrospun Biopolymers

Deuber

Mousavi

Federer

et al. 2017

Adv Materials Inter

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COMMUNICATION (1 of 7)often suffer from poor mechanical stability, [10] the scientific resources devoted to developing electrospun 3D materials are increasing each year. [6b] The unique properties of 3D materials from electrospun nanofibers enable their application as scaffolds in tissue engineering, [11] framework for heterogeneous catalysis, [12] drug release composites, [11c,13] personal safety equipment, [14] sensors, [15] or electrodes. [16] It has been shown recently, that colloidal dispersions of short electrospun nanofibers prepared by cutting electrospun membranes open a complementary and controlled approach in nonwoven nanofiber processing. [17] This change in paradigm-to separate fiber formation and fiber processing-elegantly overcomes the main drawback of electrospinning, since fiber processing is no longer coupled to the intrinsically lamellar fiber deposition, but separated into more versatile liquid handling process. Using short electrospun nanofiber dispersions, Ding and co-workers [5a] and Greiner and co-workers [18] pioneered the preparation of ultralight 3D aerogels or sponges by freeze casting. These nanofiberbased 3D materials are either referred to as aerogels [5a] or sponges. [18] They show high porosities like silica-based aerogels, but the solid scaffold is preformed by short nanofibers. [19] OurThe ORCID identification number(s) for the author(s) of this article can be found under http://dx.doi.org/10.1002/admi.201700065. Water PurificationElectrospinning allows the fabrication of nanofibers from biopolymers, synthetic polymers, and even metals. In terms of applications electrospinning has outperformed alternative technologies for nanofiber production such as melt blowing, [1] selfassembly, [2] phase separation, [3] solution blow spinning, [4] and nanofiber drawing. [3a] Electrospun nanofibers feature a large specific surface area, ultrahigh aspect ratio, extreme flexibility, and the electrospinning process can easily be scaled up. One limitation in electrospinning is the anisotropic lamellar deposition character due to the layer-by-layer manufacturing process. [5] Different ways to fabricate porous 3D structures from electrospun nanofibers have been exploited, [6] such as self-assembly, [7] cool drum spinning, [8] or gas expansion. [9] Even though those 3D scaffolds lack the possibility to add scalable pores and

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Section: Archimedean Densities Of the Green Body The Cross‐linked Aementioning

confidence: 97%

Section: Archimedean Densities Of the Green Body The Cross‐linked Aementioning

confidence: 99%

Section: Archimedean Densities Of the Green Body The Cross‐linked Aementioning

confidence: 99%

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Amphiphilic Nanofiber‐Based Aerogels for Selective Liquid Absorption from Electrospun Biopolymers

Deuber

Mousavi

Federer

et al. 2017

Adv Materials Inter

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“…It has been shown in the past that large aspect ratio electrospun polymer short fibers can form ultralow density 3D porous sponges by percolation and self‐assembly of short fibers in the suspension during freeze‐drying . The present work aimed at making high temperature stable and intrinsic flame retardant sponges.…”

Section: Resultsmentioning

confidence: 99%

“…Large specific surface area, controllable aspect ratio and morphology, versatility and easy modification endow electrospun fiber unique advantages to fabricate 3D sponge materials, which not only broaden the applications of electrospun nanofibers but also provide varying properties to the sponges. Series of electrospun polymer nanofibers including polyacrylonitrile, polyimide (PI), and polyacrylate‐based polymer has been used to assemble mechanical stable 3D sponges with numerous applications. Biodegradable polymer sponges, poly(lactic acid), polycaprolactone, and poly(vinyl alcohol) (PVA), were also prepared using similar approach, which showed applications in tissue engineering.…”

Section: Introductionmentioning

confidence: 99%

Low Density, Thermally Stable, and Intrinsic Flame Retardant Poly(bis(benzimidazo)Benzophenanthroline‐dione) Sponge

Zhu

Jiang

Hou

et al. 2018

Macro Materials & Eng

Self Cite

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Low density (≤13.9 mg cm−3), compressible poly(bis(benzimidazo)benzophenanthroline‐dione) (BBB) sponges with high temperature resistance are reported. The processing of BBB is limited due to its insolubility in organic solvents and infusibility. Therefore, the sponges are made in two steps: first, the BBB fibers are prepared by electrospinning the starting monomers with a template polymer followed by polycondensation of monomers on solid fibers at high temperature. In the second step, the BBB fibers are mechanically cut and self‐assembled from a dispersion during freeze‐drying. The use of poly(vinyl alcohol) is critical in getting self‐assembled hierarchically double‐pore‐structured, mechanically stable sponges. The sponges show very high pyrolytic stability, high compressibility (more than 92% recovery after 50% compression), very low thermal conductivity (0.028–0.038 W mK−1), and high oil absorption capacity.

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Vapor‐Phase Synthesis of Poly(para‐xylylene): From Coatings to Porous and Hierarchical Materials

Hu,

Lee,

Ramli

et al. 2024

Adv Funct Materials

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Poly(para‐xylylene) (PPX) is a robust and biocompatible coating material that is widely used in various applications, including electronics, aerospace and defense materials, automotive materials, and biomaterials. In this progress report, recent developments in PPX technology ranging from the advancement of physical chemistry properties and structural properties for device integration to the transformation of 3D monolith materials of PPX with controls in outer and inner structures at the micro‐ and nanometer scales are highlighted. Based on emerging chemistry studies on [2.2]paracyclophanes, which are primarily used precursors to synthesize PPX via vapor deposition polymerization, functionalization, and the creation of a wide variety of functional PPX derivatives are demonstrated without resistance. Widely used as an interface coating material, PPX is processed to form integrated structural materials and has already been found to be useful in the market as part of electronic and medical implant products. Using a newly innovated transformation to fabricate PPX through templates (metal‐organic frameworks, liquid crystal, ice crystal), 3D monoliths, nanoscale particles, hierarchical and gradient interior structures, and dynamically transformable shapes at the nanoscale are demonstrated. A vast landscape of novel applications and device products is expected based on the already established R&D and market maturity of PPX.

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Ultralight open cell polymer sponges with advanced properties by PPX CVD coating

Cited by 47 publications

References 22 publications

Amphiphilic Nanofiber‐Based Aerogels for Selective Liquid Absorption from Electrospun Biopolymers

Amphiphilic Nanofiber‐Based Aerogels for Selective Liquid Absorption from Electrospun Biopolymers

Low Density, Thermally Stable, and Intrinsic Flame Retardant Poly(bis(benzimidazo)Benzophenanthroline‐dione) Sponge

Vapor‐Phase Synthesis of Poly(para‐xylylene): From Coatings to Porous and Hierarchical Materials

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