Novel Superhydrophobic Aerogel on the Base of Polytetrafluoroethylene

Баскаков, С. А.; Baskakova, Yu. V.; Кабачков, Е. Н.; Dremova, Nadezhda N.; Michtchenko, A.; Shul’ga, Yu. M.

doi:10.1021/acsami.9b10455

Cited by 31 publications

(32 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aerogels are porous materials with nanostructures and exhibit promising potential for heat management due to their high porosity, low density, large specific surface area and low thermal conductivity [10][11][12][13][14]. In the past few decades, a variety of aerogel materials have been suc-cessfully prepared, including graphene [15][16][17], silica [18], carbon nanotubes [19,20] and synthetic polymers [21,22]. Recently, aerogels based on SiO 2 have become promising thermal insulating materials owing to their ultra-low thermal conductivity [23].…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic polyvinylidene fluoride/polyimide nanofiber composite aerogels for thermal insulation under extremely humid and hot environment

et al. 2020

View full text Add to dashboard Cite

Excellent thermal insulating materials are highly demanded in various applications including buildings, aerospace and sport equipment. However, in practical applications, the performance of thermal insulating materials usually deteriorates under diverse temperature and humidity conditions. Therefore, it is highly essential to construct a bulk material that exhibits outstanding thermal insulation performance under extremely humid and hot environment. In this work, we have conceived a green and effective strategy to fabricate a superhydrophobic and compressible polyvinylidene fluoride/ polyimide (PVDF/PI) nanofiber composite aerogel via electrospinning and freeze-drying technique. Interestingly, the PVDF nanofibers and PI nanofibers function as the hydrophobic fibrous framework and mechanical support skeleton, respectively, forming a robust three-dimensional framework with good mechanical flexibility. The PVDF/PI aerogel possesses outstanding superhydrophobic feature (water contact angle of 152°) and low thermal conductivity (31.0 mW m −1 K −1) at room temperature. Significantly, even at 100% relative humidity (80°C), the PVDF/PI aerogel still exhibits a low thermal conductivity of only 48.6 mW m −1 K −1 , which outperforms the majority of commercial thermal insulating materials. Therefore, the novel PVDF/PI aerogel is promising as an excellent thermal insulating material for the applications in high-temperature and humid environment.

show abstract

Section: Introductionmentioning

confidence: 99%

Superhydrophobic polyvinylidene fluoride/polyimide nanofiber composite aerogels for thermal insulation under extremely humid and hot environment

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In general, the capacity of the aerogel obtained in this work after the third combustion cycle is 1.66 times greater than that for the aerogel described previously. 22 It is interesting to gain insight into the reasons behind the decrease in the aerogel weight after burning off the alcohol.…”

Section: ■ Experimental Detailsmentioning

confidence: 99%

“…The value T max = 327 °C of the sample under study coincides with the melting temperature T m of pure PTFE obtained by sintering a suspension. 22,51 The degree of crystallinity of PTFE (x c ) can be estimated by the formula…”

Section: ■ Experimental Detailsmentioning

confidence: 99%

“…21 It was also shown that the presence of a hydrophobic substance [polytetrafluoroethylene (PTFE)] on a surface with optimal roughness increases the hydrophobicity of the surface. 21 The GO aerogel with a high content of PTFE was obtained in ref 22. Annealed at 370 °C after reduction with hydrazine, the aerogel with a density of 29 mg/cm 3 is superhydrophobic and its contact wetting angle ranges from 161.9 to 163.7°.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In addition, we present an improved technique for the preparation of 50:50 PTFE−GO aerogel granules, which have a higher sorption capacity compared to those previously reported. 22 The temperature to which the sorbent can be heated during sorbate burning was also estimated.…”

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Features and Consequences of Isopropanol Burning off PTFE–rGO Aerogels

et al. 2021

Self Cite

View full text Add to dashboard Cite

An improved procedure for the preparation of aerogel granules of polytetrafluoroethylene–graphene oxide (PTFE–GO) with a composition of 50:50 (in wt %) and a specific density of 35 ± 2 mg/cm3 is described. The technique practically excludes the granule cracking. The specific density of the pellets after reduction using hydrazine vapor and annealing at 370 °C decreased to 29 ± 2 mg/cm3. The PTFE–reduced GO (rGO) pellets obtained were tested as a recyclable sorbent for isopropyl alcohol (IPA) in sorption/combustion cycles. It has been shown that the aerogel sorption capacity for IPA increases from 35.6 to 39.3 g/g as a result of alcohol burning off. During the combustion of IPA, the temperature of an individual pellet can exceed 300 °C. When several contingent pellets are burned, the temperature of their heating increases. The fine-pored structure of the near-surface layer of the granule is destroyed during the alcohol burning, the internal structure with larger pores is exposed, and the relative proportion of PTFE on the surface of the granules decreases. It was also shown that the specific surface area of PTFE–rGO increases from 26 to 49 m2/g during cycling.

show abstract

Bipyridine Modified Conjugated Carbon Aerogels as a Platform for the Electrocatalysis of Oxygen Reduction Reaction

Peles-Strahl

Zion

Lori

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

Aerogels offer a great platform for heterogeneous electrocatalysis owing to their high surface area and porosity. Atomically dispersed transition metal ions can be imbedded in these platforms at ultra‐high site density to make them catalytically active for various reactions. Herein, the synthesis of a new class of conjugated microporous organic aerogels that are used as covalent 3D frameworks for the electrocatalysis of oxygen reduction reaction (ORR) is reported. Modified aerogels functionalized with bipyridine ligands enable copper ion complexation in a single‐step synthesis. The aerogels’ structures are fully characterized using a wide array of spectroscopic and microscopic methods, and heat‐treated in order to make them electronically conductive. After heat treatment at 600 °C, the aerogels maintained their macrostructure and became active ORR catalysts in alkaline environment, showing high mass activity and ultra‐high site density.

show abstract

Novel Superhydrophobic Aerogel on the Base of Polytetrafluoroethylene

Cited by 31 publications

References 32 publications

Superhydrophobic polyvinylidene fluoride/polyimide nanofiber composite aerogels for thermal insulation under extremely humid and hot environment

Superhydrophobic polyvinylidene fluoride/polyimide nanofiber composite aerogels for thermal insulation under extremely humid and hot environment

Features and Consequences of Isopropanol Burning off PTFE–rGO Aerogels

Bipyridine Modified Conjugated Carbon Aerogels as a Platform for the Electrocatalysis of Oxygen Reduction Reaction

Contact Info

Product

Resources

About