Integration of life cycle assessment in the design of hollow silica nanospheres for thermal insulation applications

Schlanbusch, Reidun Dahl; Jelle, Bjørn Petter; Sandberg, Linn Ingunn Christie; Fufa, Selamawit Mamo; Gao, Tao

doi:10.1016/j.buildenv.2014.05.010

Cited by 24 publications

(6 citation statements)

References 20 publications

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“…To reduce high embodied energy, fabrication cost and energy consumption should also be well considered for practical applications. Sandberg et al, 2013;Schlanbusch et al 2014 summarized the comprehensive life cycle assessment (LCA) of HSN and recommend alternative synthetic methods with other silica sources. Among all silica sources, Na 2 SiO 3 as an inorganic silica source has the advantage of environmentally friendly and low carbon footprint.…”

Section: Introductionmentioning

confidence: 99%

TEOS and Na2SiO3 as silica sources: study of synthesis and characterization of hollow silica nanospheres as nano thermal insulation materials

Yang

Xiao

et al. 2020

Appl Nanosci

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Hollow structured material (HSM) consisting of monodisperse hollow silica nanospheres (HSN) shows a promising potential for construction insulation due to its affordable cost and simple process. Yet the studies of high-yield and low-energy for the synthetic of HSN are still insufficient. This research reported the comparison of morphology and performance of synthesize HSN utilizing TEOS and Na 2 SiO 3 as silica source. The average yield of Na 2 SiO 3 -based samples can reach 93.75%, which is about 10 times higher that of TEOS-based samples. Transmission electron microscopy (TEM) and Scanning electron microscopy (SEM) results revealed that the shell morphology of TEOS-based samples was raspberry-like or smooth structure, while the shell of the Na 2 SiO 3 -based samples was round honeycomb-like structure. Hot Disk thermal constant analyzer results demonstrated that the thermal conductivity of the Na 2 SiO 3 -based samples was lower than that of the TEOS-based samples with similar inner-diameter and shell thickness. Thereafter, the influence mechanism of the morphology on thermal insulation performance was also investigated. The prepared HSN as filler significantly enhanced the thermal insulation of acrylic coating. This research confirms that the synthesis route with Na 2 SiO 3 was a greener method which can solve the low yield and high energy consumption caused using TEOS as a silica source. Excellent thermal insulation properties indicate HSN will have a broad application prospect in heat-insulating and energy-saving construction. KeywordsHollow silica nanospheres (HSN) • Sodium silicate (Na 2 SiO 3 ) • Tetraethyl orthosilicate (TEOS) • Thermal insulation

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Section: Introductionmentioning

confidence: 99%

TEOS and Na2SiO3 as silica sources: study of synthesis and characterization of hollow silica nanospheres as nano thermal insulation materials

Yang

Xiao

et al. 2020

Appl Nanosci

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“…The current investigation is a follow-up on our investigations on the formation of HSNS based on a sacrificial polystyrene template and a silica precursor of tetraethyl orthosilicate (TEOS) [19][20][21]. We have previously shown that through such synthesis methods, thermally insulating materials with low thermal conductivity values of about 20 -40 mW/(mK)can be produced [20,26], although the overall carbon footprint may be relatively high due to the use of organic silica precursor. It was then suggested that water glass (Na2SiO3, WG) can be an alternative for lowering the carbon footprint.…”

Section: Introductionmentioning

confidence: 98%

Hollow silica nanospheres as thermal insulation materials for construction: Impact of their morphologies as a function of synthesis pathways and starting materials

Jelle

Sandberg

et al. 2018

Construction and Building Materials

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Hollow silica nanospheres (HSNS) show a promising potential to become good thermal insulators with low thermal conductivity values for construction purposes. The thermal conductivity of HSNSs is dependent on their structural features such as sizes (inner diameter and shell thickness) and shell structures (porous or dense), which are affected by the synthetic methods and procedures including reaction medium, polystyrene template, and silica precursor. . Formation of thermally insulating HSNS was in general favoured by alkaline reaction, whereby highly porous silica shells were formed, promoting less silica per volume of material, thus a lower solid state thermal conductivity. The Knudsen effect is in general reducing the gas thermal conductivity including the gas and pore wall interaction for materials with pore diameters in the nanometer range, which is also valid for our HSNS reported here.Further decreasing the pore sizes would invoke a higher impact from the Knudsen effect. The additional insulating effect of the inter-silica voids (median diameter D50 ≈ 15 nm) within the shell coating contributed also to the insulating properties of HSNS. The synthesis route with tetraethyl orthosilicate 2 (TEOS) was more robust and produced more porous silica shells than the one with water glass (Na2SiO3, WG), although the latter might represent a greener synthetic method.

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“…Since this energy is mainly produced by fossil fuels, it may produce a large mass of polluted air containing CO 2 and SO 2 and become a great contributing factor in environmental degradation and global warming [3][4][5][6]. In order to reduce the carbon emissions and consumption of fossil fuels, there is a need to improve the high energy-conservation technology and extend their usage in building sectors [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of low-cost and green vacuum insulation panels with fumed silica/rice husk ash hybrid core material

Saeed

Pan

et al. 2016

Materials & Design

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Integration of life cycle assessment in the design of hollow silica nanospheres for thermal insulation applications

Cited by 24 publications

References 20 publications

TEOS and Na2SiO3 as silica sources: study of synthesis and characterization of hollow silica nanospheres as nano thermal insulation materials

TEOS and Na2SiO3 as silica sources: study of synthesis and characterization of hollow silica nanospheres as nano thermal insulation materials

Hollow silica nanospheres as thermal insulation materials for construction: Impact of their morphologies as a function of synthesis pathways and starting materials

Fabrication and characterization of low-cost and green vacuum insulation panels with fumed silica/rice husk ash hybrid core material

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