Preparation of low density organosilica monoliths containing hollow silica nanospheres as thermal insulation materials

Grandcolas, Mathieu; Jasinski, Euphrasie; Gao, Tao; Jelle, Bjørn Petter

doi:10.1016/j.matlet.2019.05.021

Cited by 13 publications

(4 citation statements)

References 13 publications

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“…An approach method for achieving a highly porous structure involves assembling specific micro-objects as building blocks, resulting in a hierarchically organized structure that combines high porosity with mechanical strength surpassing that of conventional aerogels. Güler et al [34] have successfully applied this approach to create high-capacity adsorbents, and other researchers [35,36] have explored its potential in thermal insulation materials. Nevertheless, instances of this approach remain limited in the literature.…”

Section: Introductionmentioning

confidence: 99%

Aerogel-Like Material Based on PEGylated Hyperbranched Polymethylethoxysiloxane

Borisov,

Kalinina,

Bystrova

et al. 2023

Polymers

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Aerogels are a class of materials that have gained increasing attention over the past several decades due to their exceptional physical and chemical properties. These materials are highly porous, with a low density and high surface area, allowing for applications such as insulation, catalysis, and energy storage. However, traditional aerogels, such as pure silica aerogels, suffer from brittleness and fragility, which limit their usefulness in many applications. Herein, we have addressed this problem by using organosilicon compounds, namely polymethylsilsesquioxane derivatives, for the synthesis of aerogel-like materials. Specifically, we have developed a novel approach involving surfactant-free synthesis of microcapsules from partially PEGylated hyperbranched polymethylethoxysiloxane. Due to the highly diphilic nature of these compounds, they readily concentrate at the oil/water interface in aqueous emulsions encapsulating oil droplets. During the subsequent condensation, the organosilicon precursor is consumed for hexane encapsulation (yielding hollow microcapsules) followed by the formation of a continuous condensed phase. Concurrently, methyl groups ensure the hydrophobicity of the resulting materials, which eliminates the need of using additional reagents for their hydrophobization.

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Section: Introductionmentioning

confidence: 99%

Aerogel-Like Material Based on PEGylated Hyperbranched Polymethylethoxysiloxane

Borisov,

Kalinina,

Bystrova

et al. 2023

Polymers

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“…23 Since then, a large number of functionalized organosilica nanotubes for catalysis have been reported. 24,25 Although hollow silica materials with good thermal insulation properties are available, 26 the thermal insulation properties of organosilica nanotubes have not been reported. Herein, we develop facile one-pot emulsion interfacial materialization for the synthesis of organosilica nanotubes as shown in Scheme 1.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Pd nanoparticles encapsulated in the organosilica nanotubes show excellent catalytic activity in the hydrogenation of cyclohexene . Since then, a large number of functionalized organosilica nanotubes for catalysis have been reported. , Although hollow silica materials with good thermal insulation properties are available, the thermal insulation properties of organosilica nanotubes have not been reported.…”

Section: Introductionmentioning

confidence: 99%

Organosilica Nanotubes for Thermal Insulation

Zuo

Song

et al. 2021

ACS Appl. Nano Mater.

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Super-thermal insulation materials have important applications in the field of building insulation. The construction of one-dimensional nanotube thermal insulation materials is expected to further reduce their thermal conductivity. Organosilica nanotubes are fabricated using an in situ interfacial sol–gel reaction at the inverse-emulsion interface. Compared with the preparation method of silica aerogel, this one-pot sol–gel method is facile and can be carried out at room temperature. The nanotube morphologies and gelation process can be controlled. Because of their hierarchical porous structures, the as-formed nanotube materials have high thermal insulation properties, which are below that of air.

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“…The past couple of decades have witnessed an increase in the research and development of various structured materials with functional properties, which has had a huge impact on various science, engineering, and commercial sectors. − In the field of materials’ science, hollow micro-/nanostructures have attracted tremendous interest, owing to many structural features such as high surface area, low density, and high loading capacity. − These excellent characteristics endow them with wide applications in various fields such as chemical catalysis, − battery applications, − biomedical engineering, , and others. Among the available hollow materials, the silicon-based hollow material, with a low thermal expansion coefficient, large void space for cargo storage, enhanced optical performance, and many other excellent properties, is still an actively investigated topic in many special application disciplines. − Nowadays, it is necessary that any new technologies should be developed in accordance with the principles of sustainable development to remedy global warming and resource shortages, and the use of thermal insulation materials plays an important role in energy saving and is an effective way to fulfill a sustaining development. , Therefore, many researchers have strengthened their research on the potential application of hollow silicon-based nanosphere in thermal insulation materials due to their inherent properties and the fact that cavity structure can store air. − However, the above materials are generally not waterproof, which can result in the reduction of thermal insulation performance of the materials due to the increase of material humidity during the process of long-term use . Fortunately, the particles with hierarchical structures, consisting of a microsized core and some nanoscaled particles decorated on the surface of core, have shown an important application in the superhydrophobicity field on the basis of many recent research results. , Therefore, given the advantages of the above two structures, the spheres-on-sphere (SOS) particles with both hollow cavity and hierarchical shell, where the hollow cavity can encapsulate gas to reduce the thermal conductivity of the material and the hierarchical structure can increase the moisture resistance of the material, would become a promising candidate in the field of thermal insulation.…”

Section: Introductionmentioning

confidence: 99%

Capillary Action-Inspired Nanoengineering of Spheres-on-Sphere Microspheres with Hollow Core and Hierarchical Shell

Wang

Pan

Yuan

et al. 2021

ACS Appl. Mater. Interfaces

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The current syntheses of spheres-on-sphere (SOS) microsphere, which possesses both hollow cavity and hierarchical structure, mainly rely on complicated routes and template removal. In this study, a one pot nanoengineering strategy inspired by the automatic transport behavior of water in plants is successfully developed to fabricate SOS microsphere in tandem with a traditional soft template method in the preparation of hollow structure. Amphiphilic siloxane oligomers generated in situ from methyltriethoxylsilane (MTES) under acidic conditions are anchored on the surface of soft template St monomer droplets, sequentially completing hydrolysis-polycondensation and forming a mesoporous polysilsesquioxane (PSQ) shell. Then, the St monomers located in cavity migrate outward under the combined action of capillary force stemming from mesoporous and osmotic pressure generating from inside−outside of the PSQ shell and polymerize on the outside of the hollow PSQ shell, in which residual siloxane oligomers further anchor on the polystyrene (PS) surface to reduce the surface energy of the system, finally resulting in the successful formation of SOS particles. To reduce thermal insulation coefficient of the material, the PS phase in SOS particles is removed to obtain the particles with multiscale hollow structure (SOS-MH), which have more hollow cavities to encapsulate more air. The presence of a much hollow structure in SOS-MH particles enables the thermal conductivity of polyacrylonitrile (PAN)/SOS-MH composite fibrous membranes (0.0307 W m −1 K −1 ) to decrease by about 40% compared to that of pure PAN fibrous films (0.0520 W m −1 K −1 ) at the same thickness of 1 mm, and the material also has moisture resistance due to the existence of a hierarchical shell.

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Preparation of low density organosilica monoliths containing hollow silica nanospheres as thermal insulation materials

Cited by 13 publications

References 13 publications

Aerogel-Like Material Based on PEGylated Hyperbranched Polymethylethoxysiloxane

Aerogel-Like Material Based on PEGylated Hyperbranched Polymethylethoxysiloxane

Organosilica Nanotubes for Thermal Insulation

Capillary Action-Inspired Nanoengineering of Spheres-on-Sphere Microspheres with Hollow Core and Hierarchical Shell

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