Robust, ultra-insulative and transparent polyethylene-based hybrid silica aerogel with a novel non-particulate structure

Rezaei, Sasan; Jalali, Amirjalal; Zolali, Ali M.; Alshrah, Mohammed; Karamikamkar, Solmaz; Park, Chul

doi:10.1016/j.jcis.2019.04.028

Cited by 34 publications

(27 citation statements)

References 71 publications

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“…Thus, we are able to create effective stress-transfer pathways within the threedimensional (3-D) GnP-reinforced PVTMS-based silica aerogels (PE-b-Si/GnP). The 3-D bonded PE-b-Si/GnP was synergistically strengthened, and it had complete structural deformations and a great compressive mechanical strength (68.7 MPa at a compressive strain of 90%) in contrast to our pure PE-based silica aerogel ($7.2 MPa at one compression cycle in the samedensity range 43 ). It also had the greatest minimal structural shrinkage reported to date for this aerogel family.…”

Section: Discussionmentioning

confidence: 82%

“…This study produced a unique nonparticulate morphology with very small pore sizes and a large surface area using an in situ structural engineering methodology for the selective inclusion of reticulate PVTMS-based silica aerogel (produced with spinodal decomposition 43 ) with only 2 wt% GnP. Thus, we are able to create effective stress-transfer pathways within the threedimensional (3-D) GnP-reinforced PVTMS-based silica aerogels (PE-b-Si/GnP).…”

Section: Discussionmentioning

confidence: 99%

“…The procedure of sol-gel synthesis to produce pure PE-based silica gel has been fully described in our previous studies. 7,43 In summary, to develop a wet gel for a pure PE-b-Si gel, 4 g of a polymeric precursor, with 5.4 g of ammonia (catalyst), was added to 20 ml of ethanol, and then warmed at 40 C. The mixture gelled aer 90 minutes and provided sample 1.…”

Section: Sol-gel Synthesis For Pure and Gnp-reinforced Pe-based Silica Wet Gels (Pe-b-si/gnp)mentioning

confidence: 99%

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The effect of graphene-nanoplatelets on gelation and structural integrity of a polyvinyltrimethoxysilane-based aerogel

et al. 2019

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Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Sol-gel Synthesis For Pure and Gnp-reinforced Pe-based Silica Wet Gels (Pe-b-si/gnp)mentioning

confidence: 99%

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The effect of graphene-nanoplatelets on gelation and structural integrity of a polyvinyltrimethoxysilane-based aerogel

et al. 2019

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“…Through time, aerogels have been obtained by structuring both organic and inorganic materials. Silica [24,42,43], silica/pre-polymerized vinyl trimethoxy silane (VTMS) composites [44], and graphene-based aerogels [23,45] are among the most used inorganic materials reported for aerogel production. However, despite several relevant features found for inorganic aerogels, biopolymer-based aerogels have been the object of much research lately due to their mechanical properties [46], non-toxicity [25], and biocompatibility [21], all desirable properties in systems to be used in biomedical field [47].…”

Section: Overview: Polysaccharide-based Porous Materialsmentioning

confidence: 99%

Smart Porous Multi-Stimulus Polysaccharide-Based Biomaterials for Tissue Engineering

2020

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Recently, tissue engineering and regenerative medicine studies have evaluated smart biomaterials as implantable scaffolds and their interaction with cells for biomedical applications. Porous materials have been used in tissue engineering as synthetic extracellular matrices, promoting the attachment and migration of host cells to induce the in vitro regeneration of different tissues. Biomimetic 3D scaffold systems allow control over biophysical and biochemical cues, modulating the extracellular environment through mechanical, electrical, and biochemical stimulation of cells, driving their molecular reprogramming. In this review, first we outline the main advantages of using polysaccharides as raw materials for porous scaffolds, as well as the most common processing pathways to obtain the adequate textural properties, allowing the integration and attachment of cells. The second approach focuses on the tunable characteristics of the synthetic matrix, emphasizing the effect of their mechanical properties and the modification with conducting polymers in the cell response. The use and influence of polysaccharide-based porous materials as drug delivery systems for biochemical stimulation of cells is also described. Overall, engineered biomaterials are proposed as an effective strategy to improve in vitro tissue regeneration and future research directions of modified polysaccharide-based materials in the biomedical field are suggested.

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“…The connection points between secondary particles in silica aerogels are conventionally via siloxane, which is a stiff bond and supports most of the tension once it is under load. Several methods of mechanical improvement for silica aerogels , have been explored by researchers, such as (i) structural reinforcement using flexible silica precursors in the silica gel backbone, − (ii) surface cross-linking of secondary silica particles with a polymer, , (iii) distribution of a flexible secondary phase into the silica sol before gelation, − (iv) prolonged aging step, , and (v) polymerization of the silica precursor before gelation. − …”

Section: Introductionmentioning

confidence: 99%

In Situ Interface Design in Graphene-Embedded Polymeric Silica Aerogel with Organic/Inorganic Hybridization

Karamikamkar

Fashandi

Naguib

et al. 2020

ACS Appl. Mater. Interfaces

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For many practical applications, the most important factor is to have an improved interface between the matrix and dispersed phase in a compressible composite aerogel having a high degree of porosity and a large surface area. Although some measure of compressibility is obtained in polymer-based aerogels with a continuous backbone through the hybridization of the stiff backbone [polyvinyltrimethoxysilane (P-VTMS), −C–C−] and flexible backbone [poly(3-glycidyloxypropyl)trimethoxysilane (P-GPTMS), −C–O–C−], it seems that the extent of improvement is insignificant in terms of interface improvement, surface area increase, and ordered mesoporous network. In this study, the effects of the incorporation of graphene nanoplatelets (GnPs) on aerogels made of a backbone consisting of −C–O–C– (flexible backbone) were examined in terms of structural improvement and were compared with aerogels made of a backbone consisting of −C–C– (stiff backbone). Moreover, the inorganic siloxane cross-link density between the underlying polymer chains was controlled by inducing hydrogen bonding between polymer chains and GnPs. This approach reduces the structural shrinkage during gelation and drying. The integration of only 1 wt % GnP integrated into the backbone by using spinodal decomposition phase separation processing allowed control of the pore size and the surface area. Integration of GnPs through in situ exfoliation during sol–gel transition is shown to be the best approach using the lowest possible amount of GnPs to improve aerogels’ mesoporous network made from polymerized GPTMS. A flexible backbone such as P-GPTMS chains is supposed to result in a compliant aerogel, but the chains tend to shrink extensively during gelation and drying, reducing the porosity. P-GPTMS-derived aerogel suffers from a wrong combination of flexible backbone conjugated with an extensive number of permanent chemical cross-links and abundant remaining unreacted hydroxyl groups that undergo permanent chemical shrinkage. To counteract this, the GnP-reinforced prepolymer precursor (P-GPTMS) with fewer siloxane cross-links was synthesized and studied. By use of this strategy, the same elastic properties as those seen with the hybrid P-VTMS- and hybrid P-GPTMS-derived aerogels were imparted, while also improving the mechanical strength by up to 138% and the surface area by up to 205% by controlling the extent of GnP exfoliation during the sol–gel transition. This exceptional effect of GnP on the surface area improvement was shown to be of up to 2.05-fold for P-GPTMS and 2.63-fold for P-VTMS material.

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Robust, ultra-insulative and transparent polyethylene-based hybrid silica aerogel with a novel non-particulate structure

Cited by 34 publications

References 71 publications

The effect of graphene-nanoplatelets on gelation and structural integrity of a polyvinyltrimethoxysilane-based aerogel

The effect of graphene-nanoplatelets on gelation and structural integrity of a polyvinyltrimethoxysilane-based aerogel

Smart Porous Multi-Stimulus Polysaccharide-Based Biomaterials for Tissue Engineering

In Situ Interface Design in Graphene-Embedded Polymeric Silica Aerogel with Organic/Inorganic Hybridization

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