Physiochemical and thermal properties of silica Aerogel–Poly vinyl alcohol / Core–Shell structure prepared using fluidized bed coating process for thermal insulation applications

Halim, Zulhelmi Alif Abdul; Yajid, Muhamad Azizi Mat; Idris, Mohd Hasbullah; Hamdan, Halimaton

doi:10.1016/j.matchemphys.2018.05.019

Cited by 17 publications

(10 citation statements)

References 28 publications

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“…The appeared hysteresis loop in SA1 sample reveals the type H‐1, indicating low agglomerates, approximately uniform pores and narrow pore‐size distribution 41,43 . The appeared hysteresis loop in SA2 refers to type H‐3, confirming slit‐shaped pores 28,36 . AH‐2 type hysteresis loop is observed in adsorption‐desorption isotherms of SA3 sample, which shows particles agglomeration and pores blocking with nonuniform size and shape 44 .…”

Section: Resultsmentioning

confidence: 86%

“…The SA3 sample was dried under ambient condition without reinforcing the gel network. Therefore, as expected, the aerogel cannot withstand huge capillary force, and shrinkage of the wet gel cannot be prevented, leading to major destruction of the pores and consequently low surface area and porosity of aerogel 28 . Furthermore, the SA2 sample exhibited a more surface area and porosity compared to SA1 due to using conventional method of supercritical drying, which the liquid is removed from wet gel system in the supercritical condition.…”

Section: Resultsmentioning

confidence: 88%

“…In this figure, the common bands attributed to solid network vibrations and major peaks related to PVA are clearly obvious. The broad band between 3100 and 3600 cm −1 is related to OH stretching vibrations of intermolecular and intramolecular hydrogen‐bonded among silanol groups and PVA molecules 28,35 . The presence of surface silanol groups leads to water adsorption, so the appeared bands around 1633 and 1637 cm −1 at both spectra are corresponded to deformation vibrations of physically absorbed water on the surface 36 .…”

Section: Resultsmentioning

confidence: 98%

“…This penetrated polymeric phase reinforced the network to avoid destroy and collapse of network during drying. Strengthening the gel network by PVA can be in the result of the generated hydrophobic‐hydrophilic interface, as well as due to hydrogen bonds among OH groups of PVA and residual SiOH groups of TEOS, which lead to preservation of porous structure of SA1 in drying stage 27,28 …”

Section: Resultsmentioning

confidence: 99%

“…It should be pointed out that using the hydrophilic PVA as reinforcing agent leads to generating strong secondary interactions between the pendant hydroxyl groups of PVA and residual silanol groups produced from hydrolysis and polycondensation of tetraethyl orthosilicate (TEOS) 27 . The created hydrophobic‐hydrophilic interface due to physically coating of the silica aerogel surface by PVA can be withstood capillary forces and ensured the preservation of porous structure in the silica aerogel 28 …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Efficient reinforcement of wet gel by embedded polymer as newly approach for silica aerogel

Bananifard

Ashjari

Niazi

et al. 2020

Polymers for Advanced Techs

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Silica aerogel as an ultra-porous material with high specific surface area is fabricated through drying a wet gel. Although ambient pressure drying is considered as simplest method, the obtained physical properties are not very desired. Here, we introduced a novel approach to improve the efficiency of ambient pressure drying technique by enhancing the strength and firmness of pores walls. The tetraethyl orthosilicate was used to produce the wet gel. The gel network was reinforced via embedding the polyvinyl alcohol cross-linkable polymer into porosities of wet gel, and drying at ambient condition, forming an interpenetrating network. The thermal treatment was applied to remove the polymeric phase from structure of reinforced network. A proper specific surface area, good density, and high porosity were achieved about 503 m 2 /g, 0.23 g/cm 3 , and 89%, respectively. Furthermore, the obtained interconnected structure along whit large numbers of open mesopores confirms the acceptable efficiency of introduced facilitated technique.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Efficient reinforcement of wet gel by embedded polymer as newly approach for silica aerogel

Bananifard

Ashjari

Niazi

et al. 2020

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

Flexible and Transformable Ceramic Aerogels via a Fire‐Reborn Strategy for Thermal Superinsulation in Extreme Conditions

Cheng,

Ma,

et al. 2023

Adv Funct Materials

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Effective thermal superinsulation in extremely high temperatures (EHT) is crucial for aerospace, industrial, and civilization activities. However, current strategies relying on ceramic materials face limitations due to their high thermal conductivity and brittleness in specific conditions. In this study, a feasible and scalable method for synthesizing a flexible, lightweight, and transformable fire‐reborn silica‐alumina hybrid ceramic aerogel (FR‐SACA) is presented, which is achieved by rearranging silica aerogel microparticles and Al2O3 ceramic fibers using a self‐sacrifice polymer, resulting in a bio‐inspired bird nest structured FR‐SACA. The SACA exhibits exceptional properties, including an ultra‐low density of 0.01 g cm−3, a low thermal conductivity of 0.029 W m−1 K−1, and a reversible compression of up to 80%. Notably, a 20 mm‐thick FR‐SACA demonstrates a remarkable temperature reduction of 1179.6 °C when exposed directly to a 1300 °C flame, suggesting its potential as a thermal superinsulation material in EHT environments. Furthermore, the transformability of SACA enables in situ fabrication on surfaces with diverse heteromorphic structures, such as flat, bent, and angled shapes, thereby providing thermal superinsulation for various constructions. The Phoenix Nirvana process opens up new possibilities for synthesizing ceramic aerogels with desirable flexibility and adaptive properties, facilitating effective thermal management under extreme conditions.

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Robust composite aerogel beads with pomegranate-like structure for water-based thermal insulation coating

Kang

et al. 2022

Construction and Building Materials

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Physiochemical and thermal properties of silica Aerogel–Poly vinyl alcohol / Core–Shell structure prepared using fluidized bed coating process for thermal insulation applications

Cited by 17 publications

References 28 publications

Efficient reinforcement of wet gel by embedded polymer as newly approach for silica aerogel

Efficient reinforcement of wet gel by embedded polymer as newly approach for silica aerogel

Flexible and Transformable Ceramic Aerogels via a Fire‐Reborn Strategy for Thermal Superinsulation in Extreme Conditions

Robust composite aerogel beads with pomegranate-like structure for water-based thermal insulation coating

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