Nanomaterials’ Influence on the Performance of Thermal Insulating Mortars—A Statistical Analysis

Pedroso, Marco; Flores‐Colen, Inês; Silvestre, José Dinis; Gomes, M. Glória

doi:10.3390/app10072219

Cited by 11 publications

(12 citation statements)

References 79 publications

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“…Moisture and heat affect the properties of the material, in particular its thermal conductivity. Laboratory testing of the above-mentioned parameters is widely discussed by both domestic and foreign research groups [5][6][7]12,14,16,18,19]. This paper complements previous research studies executed on the fiber-reinforced aerogel insulation [10,11].…”

Section: Introductionsupporting

confidence: 62%

“…Regarding insulating materials, we often do not have complete information on how they behave under external influences, such as humidity, temperature or time. These might change their properties and possibly their structures, and they may lose their good thermal insulation properties that are already present during production [3,11,12,[14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Exceeding the Applicability Limit of Aerogel Super Insulation Materials in Different Environmental Conditions

Lakatos

2020

Applied Sciences

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Newly designed and constructed buildings are subjected to increasingly strict regulations which emphasize the minimization and, where possible, the elimination of wasteful energy consumption, thus resulting in a decrease in emissions. Thermal insulation materials have an important role in making better use of the primary energy delivered to consumer systems, be it by an industrial process or building services systems or in residential and commercial buildings. It is well declared that buildings account for about 30% of total energy consumption, while they contribute to about 20% of greenhouse gas emissions. High-performance insulation has great potential to achieve the European Commission’s ambitious goals for reducing the thermal loss of buildings. A new class of super insulation materials (SIMs) could play an important role in the future of insulations (e.g., fiber-reinforced silica aerogel). This material is grouped with super insulation materials by the sixty-fifth annex of the International Energy Agency. However, due to their short presence on the market, we do not know much about their long-term performance, and if their properties change with time, the question is how and in which direction they do. This is why their artificial aging is so important through thermal annealing, in addition to exposing them to high humidity and low temperatures. In this paper, the application of measurement results after the artificial aging of fiber-reinforced silica aerogel will be discussed. In order to see the changes in the thermal insulation capability of the materials, 13 different cases of environmental exposures are discussed. These cases will be presented to see possible changes in the thermal insulation performance of the aerogel after treating it in different climatic conditions. Firstly, samples were exposed to humidity treatments at 296 K with different relative humidities (0, 35, 50, 65, 80 and 90%) until they reached equilibrium moisture contents. Secondly, the samples were heat treated once for 6 weeks at 343 K, then for 1 day at 373, 423, 453 and 483 K. Moreover, we wanted to see the effects of frost, and thus we executed a freeze–thaw cycle on the samples for 25 days between 258 and 303 K. After these curing procedures, the thermal conductivities of the samples were measured with a heat flow meter, according to the ISO 8301 standard. The measured thermal conductivity values after heat treatment, wetting and freezing were used for building energetics calculations, with a special focus on the thermal transmittance of two different hypothetical building structures (brick- and concrete-based walls) covered with the mentioned insulation.

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Section: Introductionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Exceeding the Applicability Limit of Aerogel Super Insulation Materials in Different Environmental Conditions

Lakatos

2020

Applied Sciences

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“…Nanotechnology is a field dealing with the synthesis of various structures having at least a size within the range 1–100 nm and is one of the most rapidly developing sciences [ 1 ]. Nanomaterials find applications in such areas as food packaging [ 2 ], the electric industry [ 3 , 4 ], or catalysts [ 5 , 6 ]. Nonetheless, particular interest in nano-sized materials is currently observed in medicine and the related areas, i.e., in orthopedy [ 7 ], dentistry [ 8 , 9 ], or in drug delivery [ 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

The Synthesis Methodology of PEGylated Fe3O4@Ag Nanoparticles Supported by Their Physicochemical Evaluation

et al. 2021

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Many investigations are currently being performed to develop the effective synthesis methodology of magnetic nanoparticles with appropriately functionalized surfaces. Here, the novelty of the presented work involves the preparation of nano-sized PEGylated Fe3O4@Ag particles, i.e., the main purpose was the synthesis of magnetic nanoparticles with a functionalized surface. Firstly, Fe3O4 particles were prepared via the Massart process. Next, Ag+ reduction was conducted in the presence of Fe3O4 particles to form a nanosilver coating. The reaction was performed with arabic gum as a stabilizing agent. Sound energy-using sonication was applied to disintegrate the particles’ agglomerates. Next, the PEGylation process aimed at the formation of a coating on the particles’ surface using PEG (poly(ethylene glycol)) has been performed. It was proved that the arabic gum limited the agglomeration of nanoparticles, which was probably caused by the steric effect caused by the branched compounds from the stabilizer that adsorbed on the surface of nanoparticles. This effect was also enhanced by the electrostatic repulsions. The process of sonication caused the disintegration of aggregates. Formation of iron (II, III) oxide with a cubic structure was proved by diffraction peaks. Formation of a nanosilver coating on the Fe3O4 nanoparticles was confirmed by diffraction peaks with 2θ values 38.15° and 44.35°. PEG coating on the particles’ surface was proven via FT-IR (Fourier Transform Infrared Spectroscopy) analysis. Obtained PEG–nanosilver-coated Fe3O4 nanoparticles may find applications as carriers for targeted drug delivery using an external magnetic field.

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“…The aerogel-based thermal renders studied by Pedroso et al [21,32] with aramid (TR aramid) and sisal fibres (TR sisal) with, respectively, 0.50% and 0.10% substitution quantities concerning the reference render powder (in total volume) were used in the numerical simulations [33]. Furthermore, thermal renders without fibres were considered the reference (TR reference).…”

Section: Aerogel-fibre-based Thermal Rendersmentioning

confidence: 99%

Application of Silica-Aerogel-Fibre-Based Thermal Renders for Retrofits in Building Walls: A Comparative Assessment with Benchmark Solutions

Pedroso,

Silvestre,

Gomes

et al. 2023

Gels

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The current climate change context raises the demand for reducing energy and environmental impacts while keeping an economic balance and building users’ comfort. Thermal insulation solutions are potential allies in ensuring the adequacy of existing buildings for challenging sustainability requirements. In this scenario, silica-aerogel-fibre-based thermal renders are innovative solutions for which integrated approaches still lack information, and they should be compared with benchmark multilayer solutions, such as those based on expanded polystyrene (EPS), extruded polystyrene (XPS), mineral wool (MW), and insulated corkboard (ICB), to evidence their prospective economic, environmental, and energy benefits. This paper quantifies the optimum insulation thicknesses, life cycle savings, payback periods, and environmental impacts of innovative thermal renders compared to conventional thermal insulation materials when applied as a retrofit in existing facade walls. The results show that cost-optimised thermal renders with sisal fibres led to the best overall performance. Higher heating needs led to higher optimum render thicknesses and life cycle savings. With a 0.02 m thickness, aerogel-fibre-based thermal renders outperformed other materials in terms of heating-degree days (HDD) from 1000 °C·day onwards; they can save approximately EUR 60∙m−2, 1000 MJ∙m−2, and 100 kg CO2 eq∙m−2 while presenting a U-value 13% lower throughout their 30-year lifetime when compared with the second-best multilayer solution with XPS.

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Nanomaterials’ Influence on the Performance of Thermal Insulating Mortars—A Statistical Analysis

Cited by 11 publications

References 79 publications

Exceeding the Applicability Limit of Aerogel Super Insulation Materials in Different Environmental Conditions

Exceeding the Applicability Limit of Aerogel Super Insulation Materials in Different Environmental Conditions

The Synthesis Methodology of PEGylated Fe3O4@Ag Nanoparticles Supported by Their Physicochemical Evaluation

Application of Silica-Aerogel-Fibre-Based Thermal Renders for Retrofits in Building Walls: A Comparative Assessment with Benchmark Solutions

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