Nano-heat-sink thin film composite of PC/three-dimensional networked nano-fumed silica with exquisite hydrophobicity

Katiyar, Neha; Kandasubramanian, Balasubramanian

doi:10.1039/c4ra11597j

Cited by 13 publications

(11 citation statements)

References 78 publications

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“…In addition, the IL coating on the silica surface could have served as a protective layer to hinder further silica aggregation; this enabled a higher char yield and superior thermal stability in the nanocomposites. The increased yield and retention of this insulative char improved the ablator properties, prevented the heat flux from reaching the virgin material, and had a positive effect on the flame retardancy …”

Section: Resultsmentioning

confidence: 99%

“…The new era of developments in nanotechnology makes a strong case for articulating high‐thermal‐performance RF‐based ablative nanocomposites modified with an eloquent nanofiller for the benign interface zone between the polymer and nanoparticles. We selected fumed silica (FS) for this study, as it has the ability to chemically connect with polymer precursors and their functional groups and renders excellent thermal insulation properties in composites . The aim of this study was to elucidate the interfacial chemistry and related structure–property relationship issues for tailoring FS–RF interfacial interactions with enhanced thermal ablative properties to allow these materials to be used in thermal ablative applications where the containment and suppression of high‐thermal‐heat‐flux threats to humans, equipment, and structures is of paramount importance .…”

Section: Introductionmentioning

confidence: 99%

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Ionic‐liquid‐assisted three‐dimensional caged silica ablative nanocomposites

Kumar

Kandasubramanian

2017

J of Applied Polymer Sci

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In this study, we demonstrated a novel three-dimensional network of thermally stable fumed silica (FS)-resorcinol formaldehyde (RF) nanocomposites via an ionic-liquid (IL)-assisted in situ polycondensation process. The study involved subjecting the tailored nanocomposites to thermogravimetric analysis and oxyacetylene flame environment as per ASTM test standards for thermal ablative performance. X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, highresolution transmission electron microscopy, Raman spectroscopy, and wettability studies were undertaken to underline the improvement correlation in the microstructure and material properties. Significant reductions in the linear ablation rate (66%) and mass ablation rate (26.6%), along with lower back-face temperature profiles, marked enhanced ablative properties. The increased char yield (33.3%) and higher temperatures for weight losses evinced the improved thermal stability of the modified RF resin. The uniformly dispersed fused nanosilica with a glassy coating morphology on the ablative surface acted as barrier to oxidation. The results signify that the IL-assisted modification of the RF resin with FS significantly enhanced ablative performance. A viable replacement to the conventional phenolic nanocomposites for thermal ablative applications to buy critical time for the containment and suppression of thermal-heat-flux threats is of paramount importance.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ionic‐liquid‐assisted three‐dimensional caged silica ablative nanocomposites

Kumar

Kandasubramanian

2017

J of Applied Polymer Sci

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“…Pryde et al . have demonstrated that polycarbonate under the condition of humidity and temperature is conducive to the rapid hydrolysis if it do not contain hydrolytic stabilizers 12 , 13 . In another study Devis et al .…”

Section: Introductionmentioning

confidence: 99%

Structural and Thermal Stability of Polycarbonate Decorated Fumed Silica Nanocomposite via Thermomechanical Analysis and In-situ Temperature Assisted SAXS

Yadav

Naebe

Wang

et al. 2017

Sci Rep

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The inorganic and organic nanocomposites have enticed wide interest in the field of polymer-based composite systems to augment their physiochemical properties like mechanical strength and electrical conductivity. Achieving interfacial interaction between inorganic filler and polymer matrix is a recurring challenge, which has significant implications for mechanical properties of nanocomposites. In this context, the effect of “interfacial zone” on structural and thermal attributes of the melt blended pristine polycarbonate and polycarbonate (PC) decorated fumed silica nanocomposite have been examined from ambient temperature to the glass transition temperature. Thermomechanical characterization and in-situ temperature assisted small angle X-ray scattering technique (SAXS) were used for contemplating quantitative and qualitative molecular dynamics of developed nanocomposites. Though, the FT-IR spectra have demonstrated some extent of interaction between inorganic and organic groups of composite, the reduced glass transition temperature and storage modulus was ascertained in DMA as well as in DSC, which has been further confirmed by in-situ temperature assisted SAXS. It is envisioned that the utilization of in-situ SAXS in addition to the thermomechanical analysis will render the qualitative and quantitative details about the interfacial zone and its effect on thermal and mechanical properties of nanocomposite at varying temperature conditions.

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“…The modification via surface chemistry requires regulation of surface tension between oils (30 mN/m), and organic solvents (18.4 mN/m), and water (72.8 mN/m), thereby allowing only oil/solvent absorption but avoiding water wetting [2,10,12,16]. In present study, the authors have utilized engineering polycarbonate (PC) polymer for oil recovery, as it is mechanically strong (izod impact strength = 600-850 J/m), thermal stability (up to 350 °C), ability to facilitate solution formation, and maintaining its structural rigidity up to its high glass transition temperature (140 °C) [17][18][19][20][21][22]. The activated charcoal was utilized in conjunction with PC polymer, since it exhibits functionalized surface encompassing functional groups like C=O, -CO 3 , O-H, and C-O which facilitates bonding with polymer matrix, and is readily available in commercial market at low cost [23,24].…”

Section: Introductionmentioning

confidence: 99%

Polycarbonate and activated charcoal-engineered electrospun nanofibers for selective recovery of oil/solvent from oily wastewater

et al. 2020

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Present study reports polycarbonate (PC) nanofibers functionalized with industrial grade activated charcoal for emphatic oil-water separation and recovery of petroleum oils and organic solvents from oily wastewater. The developed PC nanofibers demonstrate hydrophobicity (water contact angle of 133°) and oleophilicity (oil and/-or solvent contact angle is equal to 0°), simultaneously. The functionalized PC nanofibers exhibit average permeation flux of 10,834.5 L m −2 h −1 and 39,886.5 L m −2 h −1 toward diesel, and n-Hexane solvent, respectively. Developed PC nanofibers demonstrated an excellent oil recovery toward petroleum oil products like petrol, diesel, and engine oil, which was found to be 308%, 872%, and 1738%, respectively, till 10 washing cycles. Thermogravimetric analysis of developed PC nanofibers revealed thermal stability up to 350 °C, thereby demonstrating its applicability in harsh environmental conditions. Functionalization of PC polymer nanofibers with activated charcoal was confirmed using FTIR study. The morphological analysis of charcoal functionalized PC nanofibers revealed a heterogeneous rough patterned textures with a porosity (which facilitate the air-pockets for improved hydrophobicity) manifesting inside the fibers. The pH-based performance (pH range of 2-14) demonstrated that the developed microfibers maintain its hydrophobicity ad service durability under harsh acidic and alkaline mediums (corrosive environments). The PC nanofibers demonstrate simultaneous hydrophobic-oleophilic behavior which is well explained using principal Cassie-Baxter's theory. The successive results demonstrate that the activated charcoal functionalized PC microfibers could be successfully utilized for practical recovery of oil/organic solvents from oily wastewater, and for the oil-spill cleanups.

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Nano-heat-sink thin film composite of PC/three-dimensional networked nano-fumed silica with exquisite hydrophobicity

Abstract: Efficient utilization of fumed silica with thermoset resins had been investigated for high temperature applications, which led to extensive exploration of newer materials.

Cited by 13 publications

References 78 publications

Ionic‐liquid‐assisted three‐dimensional caged silica ablative nanocomposites

Ionic‐liquid‐assisted three‐dimensional caged silica ablative nanocomposites

Structural and Thermal Stability of Polycarbonate Decorated Fumed Silica Nanocomposite via Thermomechanical Analysis and In-situ Temperature Assisted SAXS

Polycarbonate and activated charcoal-engineered electrospun nanofibers for selective recovery of oil/solvent from oily wastewater

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