scholarly journals Development and Study of the Structure and Properties of a Composite Textile Material with Encapsulated Heat-Preserving Components for Heat-Protective Clothing

2021 ◽  
Vol 11 (11) ◽  
pp. 5247
Author(s):  
Irina Cherunova ◽  
Nikolai Kornev ◽  
Ekaterina Lukyanova ◽  
Valery Varavka
Keyword(s):  
Thermal Conductivity ◽  
Thermophysical Properties ◽  
Protective Clothing ◽  
Structural Parameters ◽  
Modern Technology ◽  
Fibrous Materials ◽  
Structure And Properties ◽  
Complex Materials ◽  
Textile Materials ◽  
Active Function

The modern technology of heat-protective clothing is increasingly aimed at maintaining the active function of materials. Adding heat-preserving components into the volume of heat-insulating fibrous materials changes their structure and properties. In this article, the methods of forming the structure of multi-component insulants with heat-preserving components, as well as the study of structural and thermophysical properties, are presented. Composite textile materials were used in this study, namely a 0/30/50/100% Outlast textile (based on polyester fleece, 70%) + Termofiber (fiber-insulated polyester material, 100%). Based on the research, we established the structural parameters of Termofiber fibrous canvas and the Outlast textile. The study of the thermal conductivity of complex combined insulation materials was performed for different temperature conditions (up to +25 °C) and for the proportion of the heat-accumulating textile components. Based on the obtained research results for the development of complex materials from Termofiber + the Outlast textile, the fraction of the Outlast textile component should be limited to no more than 40% for textile shells in clothing that are operated at a temperature of +5 °C or below. Further conditions for determining the composition of the studied materials for clothing can be settled by taking into account the density of the materials, the mass, and the general thermal insulation of clothing.

Development of high-insulating materials with aerogel for protective clothing applications – an overview

2021 ◽  
Vol 112 (2) ◽  
pp. 164-172
Author(s):  
Agnieszka Greszta ◽  
Sylwia Krzemińska ◽  
Grażyna Bartkowiak ◽  
Anna Dąbrowska
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Protective Clothing ◽  
State Of The Art ◽  
Knitted Fabrics ◽  
Insulating Materials ◽  
Textile Materials ◽  
Wide Range ◽  
Properties Of Materials ◽  
Hot Environments

Abstract Aerogels are ultra-light solids with extremely low thermal conductivity (even lower than air), thanks to which they have a huge potential in a wide range of applications. The purpose of this publication is to present the state-of-the art knowledge of the possibility of using aerogels to increase the thermal insulation properties of clothing materials intended for use in both cold and hot environments. Various methods of aerogels application to textile materials (non-woven, woven and knitted fabrics) are discussed, indicating their advantages and limitations. Numerous research studies confirm that aerogels significantly improve the thermal insulation properties of materials, but due to their delicate and brittle structure and their tendency to dusting, their application still poses considerable problems.

OPTIMIZATION OF THE FRACTAL-LIKE ARCHITECTURE OF POROUS FIBROUS MATERIALS RELATED TO PERMEABILITY, DIFFUSIVITY AND THERMAL CONDUCTIVITY

Fractals ◽  
2017 ◽  
Vol 25 (03) ◽  
pp. 1750030 ◽  
Author(s):  
BOQI XIAO ◽  
WEI WANG ◽  
JINTU FAN ◽  
HANXIN CHEN ◽  
XIAOLONG HU ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Fractal Dimension ◽  
Effective Thermal Conductivity ◽  
Protective Clothing ◽  
Effective Diffusivity ◽  
Theoretical Models ◽  
Fibrous Materials ◽  
Clothing Insulation ◽  
Aligned Fibers ◽  
Lower Porosity

In this study, the optimization of the fractal-like architecture of porous fibrous materials related to permeability, diffusivity, and thermal conductivity was analyzed by applying the established theoretical models. It was observed that the ratio of dimensionless permeability over dimensionless effective diffusivity decreased with the decrease of porosity and tortuosity fractal dimension, respectively, which implied that lower porosity and tortuosity fractal dimension were beneficial to wind/water resistant fabric, as it reduced the ratio of dimensionless permeability over dimensionless effective diffusivity. Besides, it was found that the ratio of the dimensionless total effective thermal conductivity over dimensionless effective diffusivity increased with tortuosity fractal dimension, which implied lower tortuosity fractal dimension was beneficial to clothing insulation, as it reduced the ratio of dimensionless total effective thermal conductivity over dimensionless effective diffusivity. The optimization results indicated that fabrics with more aligned fibers were preferred for protective clothing, as the low tortuosity fractal dimension implied fibers in the fibrous materials should be more aligned.

Influence of Structure and Composition of the Fibrous Materials on the Performance Characteristics of Thermal Protection Structures with Combined Functions

2018 ◽  
Vol 284 ◽  
pp. 65-70 ◽  
Author(s):  
I.V. Cherunova ◽  
L. Osipenko ◽  
M. Stenkina
Keyword(s):  
Multilayer Structure ◽  
Thermal Protection ◽  
Fibrous Materials ◽  
Structure And Properties ◽  
Ministry Of Education ◽  
State Technical ◽  
Textile Materials ◽  
Moist Environment ◽  
Protective Structures ◽  
Made In

In the article research results are presented, the aim of which is to provide high quality and reliability while using heat-protective structures for machines and people. Textile materials perform important function contacting moisture in the atmosphere. Results of moist environment textile structure and properties research are also presented here. It was established that multilayer structure with free elementary cells, including knitwear, for the purposes of barrier maintenance of moisture level is not sufficient. Based on the performed experimental research, new characteristics and properties pattern defining behavior of materials while contacting liquids (wetting, capillarity, moisture, hygroscopy) are established. Recommendations relating to groups and samples of textile materials are given. The research was made in Don State Technical University within the framework of State Assignment of the Ministry of education and science of Russia under the project 11.9194.2017/BCh.

scholarly journals Thermal-Insulation Properties of Multilayer Textile Packages

2014 ◽  
Vol 14 (4) ◽  
pp. 299-307 ◽  
Author(s):  
Małgorzata Matusiak ◽  
Sylwia Kowalczyk
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Thermal Insulation ◽  
Protective Clothing ◽  
Point Of View ◽  
Protective Efficiency ◽  
Knitted Fabrics ◽  
Textile Materials ◽  
Number Of Layers ◽  
Thermal Protective Clothing

Abstract Thermal-insulation properties of textile materials play a significant role in material engineering of protective clothing. Thermal-insulation properties are very important from the point of view of thermal comfort of the clothing user as well as the protective efficiency against low or high temperature. Thermal protective clothing usually is a multilayer construction. Its thermal insulation is a resultant of a number of layers and their order, as well as the thermalinsulation properties of a single textile material creating particular layers. The aim of the presented work was to investigate the relationships between the thermal-insulation properties of single materials and multilayer textile packages composed of these materials. Measurement of the thermal-insulation properties of single and multilayer textile materials has been performed with the Alambeta. The following properties have been investigated: thermal conductivity, resistance and absorptivity. Investigated textile packages were composed of two, three and four layers made of woven and knitted fabrics, as well as nonwovens. On the basis of the obtained results an analysis has been carried out in order to assess the dependency of the resultant values of the thermal-insulation properties of multilayer packages on the appropriate values of particular components.

Development of Experimental Setup for Measuring the Thermal Conductivity of Textiles

2018 ◽  
Vol 36 (3) ◽  
pp. 215-230 ◽  
Author(s):  
Muhammad Owais Raza Siddiqui ◽  
Danmei Sun
Keyword(s):  
Thermal Conductivity ◽  
Heat Flow ◽  
Thermal Comfort ◽  
Thermophysical Properties ◽  
Absolute Error ◽  
Coefficient Of Determination ◽  
Experimental Setup ◽  
Textile Materials ◽  
Technical Textiles ◽  
Heat Flow Meter

The thermophysical properties of textile materials are very important in helping to understand the thermal comfort of fabrics for clothing and technical textiles. An experimental setup for the measurement of the thermal conductivity of fabrics was developed based on the heat flow meter principle. The setup was considered highly accurate and reliable based on the low absolute error, high correlation coefficient, and the coefficient of determination between the results from the setup and commercially available devices. The setup is easy to use for testing any textile-based materials and their composites.

scholarly journals Thermophysical Properties of Cement Mortar Containing Waste Glass Powder

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 488
Author(s):  
Oumaima Nasry ◽  
Abderrahim Samaouali ◽  
Sara Belarouf ◽  
Abdelkrim Moufakkir ◽  
Hanane Sghiouri El Idrissi ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Specific Heat ◽  
Thermophysical Properties ◽  
Glass Powder ◽  
Cement Mortar ◽  
Soda Lime ◽  
Waste Glass ◽  
Soda Lime Glass ◽  
Volumetric Specific Heat ◽  
Waste Glass Powder

This study aims to provide a thermophysical characterization of a new economical and green mortar. This material is characterized by partially replacing the cement with recycled soda lime glass. The cement was partially substituted (10, 20, 30, 40, 50 and 60% in weight) by glass powder with a water/cement ratio of 0.4. The glass powder and four of the seven samples were analyzed using a scanning electron microscope (SEM). The thermophysical properties, such as thermal conductivity and volumetric specific heat, were experimentally measured in both dry and wet (water saturated) states. These properties were determined as a function of the glass powder percentage by using a CT-Meter at different temperatures (20 °C, 30 °C, 40 °C and 50 °C) in a temperature-controlled box. The results show that the thermophysical parameters decreased linearly when 60% glass powder was added to cement mortar: 37% for thermal conductivity, 18% for volumetric specific heat and 22% for thermal diffusivity. The density of the mortar also decreased by about 11% in dry state and 5% in wet state. The use of waste glass powder as a cement replacement affects the thermophysical properties of cement mortar due to its porosity as compared with the control mortar. The results indicate that thermal conductivity and volumetric specific heat increases with temperature increase and/or the substitution rate decrease. Therefore, the addition of waste glass powder can significantly affect the thermophysical properties of ordinary cement mortar.

scholarly journals Gold Nanoparticles Synthesis and Antimicrobial Effect on Fibrous Materials

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1067
Author(s):  
Behnaz Mehravani ◽  
Ana Isabel Ribeiro ◽  
Andrea Zille
Keyword(s):  
Gold Nanoparticles ◽  
Antimicrobial Properties ◽  
Antimicrobial Effect ◽  
Environmental Concerns ◽  
Fibrous Materials ◽  
Barrier Material ◽  
Future Studies ◽  
Textile Materials ◽  
Promising Strategy ◽  
Antimicrobial Materials

Depositing nanoparticles in textiles have been a promising strategy to achieve multifunctional materials. Particularly, antimicrobial properties are highly valuable due to the emergence of new pathogens and the spread of existing ones. Several methods have been used to functionalize textile materials with gold nanoparticles (AuNPs). Therefore, this review highlighted the most used methods for AuNPs preparation and the current studies on the topic in order to obtain AuNPs with suitable properties for antimicrobial applications and minimize the environmental concerns in their production. Reporting the detailed information on the functionalization of fabrics, yarns, and fibers with AuNPs by different methods to improve the antimicrobial properties was the central objective. The studies combining AuNPs and textile materials have opened valuable opportunities to develop antimicrobial materials for health and hygiene products, as infection control and barrier material, with improved properties. Future studies are needed to amplify the antimicrobial effect of AuNPs onto textiles and minimize the concerns related to the synthesis.

scholarly journals High carrier mobility and ultralow thermal conductivity in the synthetic layered superlattice Sn4Bi10Se19

2021 ◽  
Author(s):  
Ruiming Lu ◽  
Alan Olvera ◽  
Trevor Bailey ◽  
Jiefei Fu ◽  
Xianli Su ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Crystal Lattice ◽  
Carrier Mobility ◽  
Complex Materials ◽  
High Carrier Mobility ◽  
High Carrier

The integration within the same crystal lattice of two or more structurally and chemically distinct building units enables the design of complex materials featuring the coexistence of dissimilar functionalities. Here...

EXAMINATION OF THERMOPHYSICAL CHARACTERISTICS OF A HEAT-PROTECTIVE MATERIAL BASED ON FIBERGLASS DURING DESTRUCTION

2021 ◽  
pp. 91-97
Author(s):  
D.Ya. Barinov ◽  
◽  
S.Yu. Shorstov ◽  
M.G. Razmahov ◽  
A.I. Gulyaev ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermophysical Properties ◽  
Thermal Effects ◽  
Space Technology ◽  
Muffle Furnace ◽  
Thermophysical Characteristics ◽  
Initial State ◽  
Protective Material ◽  
Temperature Dependences

When designing advanced samples of aviation and rocket and space technology, during the operation of which the temperature on the surface of the material can exceed the temperature of destruction, it is important to have an understanding of the values of thermophysical properties. The work investigates the thermophysical properties of fiberglass in the initial state and after the binder is burned out in a muffle furnace. The temperature dependences of thermal effects, heat capacity, thermal diffusivity and thermal conductivity were determined, density was measured, and thermogravimetric analysis was carried out. Using a stereomicroscope, the microstructure of the lateral cut of the samples was examined and its evolution was determined during the burning of the binder.

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