Fabrication and Characterization of Porous Silica/Carbon Nanotube Composite Insulation

MRS Advances ◽  
2020 ◽  
Vol 5 (33-34) ◽  
pp. 1791-1798
Author(s):  
Naoto Shioura ◽  
Kazuki Matsushima ◽  
Tomoki Osato ◽  
Tomonaga Ueno ◽  
Norifumi Isu ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
High Performance ◽  
Porous Silica ◽  
Methyl Cellulose ◽  
Material Design ◽  
Insulation Material ◽  
Thermal Insulating ◽  
Porous Compact ◽  
Novel Material ◽  
Thermal Insulations

AbstractIn recent years, the demand for high performance thermal insulations has increased. While foam and aerogels have been researched for high performance thermal insulation, novel material design is required for further improvement. A porous silica has been found to have the potential to form a new thermal insulation material. However, porous silica is a powder and is difficult to form the porous compact. Therefore, we propose a composite insulation of powdered porous silica (p-SiO2), carbon nanotubes (CNTs) and sodium carboxy methyl cellulose (CMC). The fine voids and bulky structure of p-SiO2 greatly suppress gas and solid heat transfer. The composite of CNT can improve the moldability and enhance the mechanical properties. The moldability of thermal insulating materials improved even with the addition of 1 wt% CNT. With the addition of 1 wt% CNT, the increase in thermal conductivity was less than 0.01 W⋅m-1⋅K-1.

scholarly journals Continuous, Strong, Porous Silk Firoin-Based Aerogel Fibers toward Textile Thermal Insulation

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1899 ◽  
Author(s):  
Haiwei Yang ◽  
Zongqian Wang ◽  
Zhi Liu ◽  
Huan Cheng ◽  
Changlong Li
Keyword(s):  
Heat Transfer ◽  
Thermal Insulation ◽  
Hollow Fiber ◽  
High Performance ◽  
Large Scale ◽  
Low Density ◽  
Potential Candidate ◽  
Scale Production ◽  
Insulation Material ◽  
High Porosity

Aerogel fiber, with the characteristics of ultra-low density, ultra-high porosity, and high specific surface area, is the most potential candidate for manufacturing wearable thermal insulation material. However, aerogel fibers generally show weak mechanical properties and complex preparation processes. Herein, through firstly preparing a cellulose acetate/polyacrylic acid (CA/PAA) hollow fiber using coaxial wet-spinning followed by injecting the silk fibroin (SF) solution into the hollow fiber, the CA/PAA-wrapped SF aerogel fibers toward textile thermal insulation were successfully constructed after freeze-drying. The sheath (CA/PAA hollow fiber) possesses a multiscale porous structure, including micropores (11.37 ± 4.01 μm), sub-micron pores (217.47 ± 46.16 nm), as well as nanopores on the inner (44.00 ± 21.65 nm) and outer (36.43 ± 17.55 nm) surfaces, which is crucial to the formation of a SF aerogel core. Furthermore, the porous CA/PAA-wrapped SF aerogel fibers have many advantages, such as low density (0.21 g/cm3), high porosity (86%), high strength at break (2.6 ± 0.4 MPa), as well as potential continuous and large-scale production. The delicate structure of multiscale porous sheath and ultra-low-density SF aerogel core synergistically inhibit air circulation and limit convective heat transfer. Meanwhile, the high porosity of aerogel fibers weakens heat transfer and the SF aerogel cellular walls prevent infrared radiation. The results show that the mat composed of these aerogel fibers exhibits excellent thermal insulating properties with a wide working temperature from −20 to 100 °C. Therefore, this SF-based aerogel fiber can be considered as a practical option for high performance thermal insulation.

Potential of Cork Cement Composite as a Thermal Insulation Material

2015 ◽  
Vol 666 ◽  
pp. 17-29 ◽  
Author(s):  
Sukhdeo R. Karade
Keyword(s):  
Thermal Insulation ◽  
Building Materials ◽  
Environmental Concern ◽  
Cement Composite ◽  
Mineral Wool ◽  
Comfort Level ◽  
Environmental Benefits ◽  
Insulation Material ◽  
Thermal Insulating ◽  
The Impact

The growing environmental concern throughout the globe has led architects & engineers to design energy efficient buildings. Consequently, they are looking for building materials that can reduce the energy consumption in buildings to maintain the comfort level. Use of proper thermal insulating materials can reduce the energy required for heating or cooling of the buildings. Presently mineral wool and various foams are used for this purpose. Efforts are being made to use wastes in making thermal insulation materials so that the impact on environment can be further reduced. Cork granules are obtained as waste from the cork processing industries that make ‘bottle stoppers’ as a main product. These granules have a low density and could be used as lightweight aggregates for making concrete with low thermal conductivity. This article describes the physico-mechanical properties of lightweight cementitious composites made using cork granules. Further, environmental benefits of their application in thermal insulation of buildings has been discussed.

scholarly journals Experimental justification for sapropel and hemp shives use as thermal insulations in Latvia

2015 ◽  
Vol 1 ◽  
pp. 175 ◽  
Author(s):  
Stanislavs Pleiksnis ◽  
Maris Sinka ◽  
Genadijs Sahmenko
Keyword(s):  
Thermal Insulation ◽  
Raw Materials ◽  
Energy Resources ◽  
Insulation Material ◽  
Renewable Energy Resources ◽  
Renewable Raw Materials ◽  
Fossil Energy ◽  
Thermal Insulation Material ◽  
Experimental Justification ◽  
Thermal Insulations

<p class="R-AbstractKeywords">Fossil energy resources in Latvia are imported from other countries, but at the same time, our country is rich in renewable energy resources and other raw materials, which are used very little. In the study it is proposed to create a thermal insulation material from hemp shives grown in Latvia as a filler material and lake sediment - sapropel as a binding agent. Both of the following materials are organic, renewable and locally available. Laboratory experiments show that ecological and complying with modern requirements thermal insulation material can be obtained from local, renewable raw materials: sapropel and hemp shives.</p>

Evaluation of Structure Influence on Thermal Conductivity of Thermal Insulating Materials from Renewable Resources

1970 ◽  
Vol 17 (2) ◽  
pp. 208-212 ◽  
Author(s):  
Jolanta VĖJELIENĖ ◽  
Albinas GAILIUS ◽  
Sigitas VĖJELIS ◽  
Saulius VAITKUS ◽  
Giedrius BALČIŪNAS
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Renewable Resources ◽  
Raw Materials ◽  
Raw Material ◽  
Barley Straw ◽  
Insulation Material ◽  
Insulating Materials ◽  
Insulation Materials ◽  
Thermal Insulating

The development of new thermal insulation materials needs to evaluate properties and structure of raw material, technological factors that make influence on the thermal conductivity of material. One of the most promising raw materials for production of insulation material is straw. The use of natural fibres in insulation is closely linked to the ecological building sector, where selection of materials is based on factors including recyclable, renewable raw materials and low resource production techniques In current work results of research on structure and thermal conductivity of renewable resources for production thermal insulating materials are presented. Due to the high abundance of renewable resources and a good its structure as raw material for thermal insulation materials barley straw, reeds, cattails and bent grass stalks are used. Macro- and micro structure analysis of these substances is performed. Straw bales of these materials are used for determining thermal conductivity. It was found that the macrostructure has the greatest effect on thermal conductivity of materials. Thermal conductivity of material is determined by the formation of a bale due to the large amount of pores among the stalks of the plant, inside the stalk and inside the stalk wall.http://dx.doi.org/10.5755/j01.ms.17.2.494

scholarly journals HEAT INSULATION-APPARATUS SYSTEMS OF HOUSEHOLD FACADE AS A FACTOR OF INCREASED FIRE HAZARD

Fire Safety ◽  
2018 ◽  
pp. 80-89
Author(s):  
R. Yakovchuk ◽  
A. Kuzyk ◽  
O. Miller ◽  
A. Lyn
Keyword(s):  
Thermal Insulation ◽  
Heat Insulation ◽  
Fire Hazard ◽  
Expanded Polystyrene ◽  
Design Solution ◽  
Insulation Material ◽  
Insulating Materials ◽  
Thermal Insulating ◽  
Number Of Factors ◽  
Insulation Systems

The paper analyzes the problems associated with the fire hazard of the application of thermal insulation and finishing systems of facades of buildings, which directly depends on the design solution of the thermal insulation system and the type of thermal insulation material. The generalized requirements for physical and technical indicators of the quality of heat-insulating materials; the possibility of applying facade heat insulation structures depending on their class, the height of the houses and the combustibility of the materials of the heat-insulating and finishing layers; fire-technical characteristics of expanded polystyrene are considered. The threats of fire spreading by thermal insulation systems of facades are analyzed and possible ways of its propagation between floors are considered. It is concluded that the use of combustible thermal insulating materials poses an increased danger to life and health of people during a fire. The problem of ensuring the fire safety of buildings, in which the insulation and finishing systems of exterior walls are used, depends on a number of factors and requires a more thorough study.

scholarly journals EVALUATION OF THERMAL INSULATION PERFORMANCE OF PERLITE EXPANDED PARTICLES

2021 ◽  
Vol 21 (3) ◽  
pp. 183-196
Author(s):  
Hadeer Mahmood Yahya ◽  
Karima Esmail Amori
Keyword(s):  
Thermal Conductivity ◽  
Particle Size ◽  
Thermal Insulation ◽  
Spherical Particles ◽  
Insulation Material ◽  
Liquefied Petroleum Gas ◽  
Board Thickness ◽  
Thermal Insulating ◽  
Insulation Thickness ◽  
The Difference

The aim of this work is to test the effectiveness of new thermal insulation material formed from semi-spherical Perlite expanded particles for liquefied petroleum gas (LPG) tanks. Five different samples of semi-spherical particles of (68.8, 90.4, 300.5, 1211000, 1861000) *10-9 m diameter are used as a new thermal insulating material in this work. To simulate the LPG tank wall, a stainless-steel plate of a thickness (3mm) is coated with this material and subjected to a resistive type flat plate heater. The thermal insulation coating thickness was (0.5mm to 2mm). This plate is subjected to different power loads namely (650, 1260 W/m2). Results show that increasing the insulation expanded particle size increases the difference in temperatures on both sides of the insulation layer. The first three sizes of the insulation material reported a temperature difference at both sides of the coating layer is about 18 oC, while that for the fourth and fifth size are 20 oC and 25 oC respectively since larger expanded particles size has higher air content that enables them to reduce and delay heat transfer. The thermal conductivity of coated thermal insulation with large Perlite particle size is (0.25 W/m.K), while that for small size is (0.42 W/m.K). The previously reported thermal conductivity for Silica granules is less than 0.4 W/(m.K)for insulation thickness of (50 mm), while that for binderless cotton stalk fiberboard (BCSF) is ranged from 0.0585 to 0.0815 W/m K for board thickness 25mm. The indicated thermal conductivity for coconut husk and bagasse insulation boards is 0.046 and 0.068 W/mK for board thickness 25mm. So utilizing Perlite expanded particles as an insulation material is superior since it is a slim layer not exceeded 2 mm.

scholarly journals Aerogel Based High Performance Thermal Insulation Materials

2019 ◽  
Vol 553 ◽  
pp. 012043
Author(s):  
Mohanapriya Venkataraman ◽  
Rajesh Mishra ◽  
Jiri Militky ◽  
Dana Kremenakova ◽  
Petru Michal
Keyword(s):  
Thermal Insulation ◽  
High Performance ◽  
Insulation Materials
Sign in / Sign up

Export Citation Format

Share Document