scholarly journals Self-Heating Ability of Geopolymers Enhanced by Carbon Black Admixtures at Different Voltage Loads

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4121 ◽  
Author(s):  
Lukáš Fiala ◽  
Michaela Petříková ◽  
Wei-Ting Lin ◽  
Luboš Podolka ◽  
Robert Černý
Keyword(s):  
Electrical Properties ◽  
Carbon Black ◽  
Construction Industry ◽  
Functional Properties ◽  
Building Materials ◽  
Electrically Conductive ◽  
Self Heating ◽  
Heating Performance ◽  
Thermal And Electrical Properties ◽  
Furnace Slag

Sustainable development in the construction industry can be achieved by the design of multifunctional materials with good mechanical properties, durability, and reasonable environmental impacts. New functional properties, such as self-sensing, self-heating, or energy harvesting, are crucially dependent on electrical properties, which are very poor for common building materials. Therefore, various electrically conductive admixtures are used to enhance their electrical properties. Geopolymers based on waste or byproduct precursors are promising materials that can gain new functional properties by adding a reasonable amount of electrically conductive admixtures. The main aim of this paper lies in the design of multifunctional geopolymers with self-heating abilities. Designed geopolymer mortars based on blast-furnace slag activated by water glass and 6 dosages of carbon black (CB) admixture up to 2.25 wt. % were studied in terms of basic physical, mechanical, thermal, and electrical properties (DC). The self-heating ability of the designed mortars was experimentally determined at 40 and 100 V loads. The percolation threshold for self-heating was observed at 1.5 wt. % of carbon black with an increasing self-heating performance for higher CB dosages. The highest power of 26 W and the highest temperature increase of about 110 °C were observed for geopolymers with 2.25 wt. % of carbon black admixture at 100 V.

THE PROSPECTS OF USING CARBON NANOTUBES TO IMPART FUNCTIONAL PROPERTIES TO THE SURFACE OF POLYMER MATERIALS (review)

2021 ◽  
pp. 11-21
Author(s):  
L.V. Solovyanchik ◽  
◽  
S.V. Kondrashov ◽  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Functional Properties ◽  
Scientific Literature ◽  
Conductive Polymer ◽  
Polymer Materials ◽  
Mechanism Of Formation ◽  
Electrically Conductive ◽  
Structured Surface

Presents a review of the scientific literature on various methods for producing electrically conductive polymer materials and coatings. The prospects of using carbon nanotubes (CNT) to impart high electrical properties to the surface of materials are shown. The mechanism of formation of the structured surface of polymer materials with CNT is described. It is shown that the use of CNT is a promising way to impart electrically conductive and superhydrophobic properties to the surface.

scholarly journals Self-healing microcapsules encapsulated with carbon nanotubes for improved thermal and electrical properties

RSC Advances ◽  
2020 ◽  
Vol 10 (55) ◽  
pp. 33178-33188
Author(s):  
V. Naveen ◽  
Abhijit P. Deshpande ◽  
S. Raja
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Self Healing ◽  
Self Heating ◽  
Thermal And Electrical Properties

Carbon nanotubes incorporated microcapsules based self-heating composites.

scholarly journals Effect of Graphene Nanosheets on the Morphology, Crystallinity, and Thermal and Electrical Properties of Super Tough Polyamide 6 Using SEBS Compounds

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Farzaneh Alirezaei Hoor ◽  
Jalil Morshedian ◽  
Shervin Ahmadi ◽  
Mohammad Rakhshanfar ◽  
Alireza Bahramzadeh
Keyword(s):  
Electrical Properties ◽  
Carbon Black ◽  
Graphene Nanosheets ◽  
Polyamide 6 ◽  
Melt Mixing ◽  
Graphene Nanocomposites ◽  
Melt Compounding ◽  
Carbon Structures ◽  
Thermal And Electrical Properties ◽  
Amine Groups

Super tough polyamide 6 was prepared by using SEBS and effect of SEBS-g-MA as a compatibilizer of PA6/SEBS matrix on mechanical properties was investigated. Thus super tough polyamide 6/graphene nanocomposites were produced using graphene nanosheets (GNs) through the melt compounding method. To compare the effectiveness of graphene, effects of graphite and carbon black (the other carbon structures) are also studied on the same matrix. The effects of graphene on crystallinity, improvements of morphology, and thermal and electrical properties of the nanocomposites were researched and compared with similar samples of graphite and carbon black. Due to the reaction between the maleic anhydride groups of SEBS and amine groups of nylon chains during the melt mixing process, super tough polyamide 6 was produced with high impact and tensile strength. The most important results of this study can be noted as an increase in the electrical conductivity and thermal stability by adding graphene to PA6/SEBS blend. Also the effect of graphene compatibility on PA6/SEBS/SEBS-g-MA blend was investigated with studying morphology.

Differences in Electrical Properties of Portland Cement and Alkali-Activated Slag Mortars

2018 ◽  
Vol 276 ◽  
pp. 15-20 ◽  
Author(s):  
Pavel Rovnaník ◽  
Maria Míková ◽  
Ivo Kusák ◽  
Patrik Bayer
Keyword(s):  
Electrical Properties ◽  
Portland Cement ◽  
Building Materials ◽  
Elevated Temperatures ◽  
Sodium Ions ◽  
Alkali Activated Slag ◽  
Self Heating ◽  
Chemical Attack ◽  
Activated Slag ◽  
Alkali Activated

Alkali-activated slag is known as a building material for more than sixty years and is considered an alternative to Portland cement based binders. Compared to Portland cement it exhibits some superior properties such as higher resistance against chemical attack and exposure to elevated temperatures. Aluminosilicate binders are generally electrical insulators; however, electrical properties of building materials gain the importance in the new field of applications such as self-sensing or self-heating materials. This paper brings a comparison of the electrical properties, especially resistance and capacitance, between Portland cement and alkali-activated slag mortars. The measurements revealed that alkali-activated slag shows enhanced conducting properties due to the presence of mobile hydrated sodium ions and metallic iron microparticles.

scholarly journals Experimental and theoretical approach to determination of heat evolution in electrically conductive aluminosilicates

2020 ◽  
Vol 24 (2 Part A) ◽  
pp. 787-794
Author(s):  
Lukas Fiala ◽  
Jiri Madera ◽  
Robert Cerny
Keyword(s):  
Building Materials ◽  
Heat Evolution ◽  
Limiting Factor ◽  
Mechanical And Thermal Properties ◽  
Building Structures ◽  
Electrically Conductive ◽  
Voltage Level ◽  
Self Heating ◽  
Electric Source

Design of progressive building materials with increased utility value is the key issue for the development of reliable modern building structures. Compared to the conventional materials, progressive building materials are supposed to exhibit not just adequate mechanical, and thermal properties, but they are also supposed to be applicable in sophisticated solutions, such as in self-sensing, self-heating or magnetic-shielding systems. In terms of electric properties, the most of building materials are electric insulators which is the main limiting factor for their applicability in such sophisticated solutions. However, this deficiency can be solved by the addition of a proper amount of electrically conductive admixtures. Within the paper, electrically conductive alkali-activated aluminosilicate with 8.89 mass.% of carbon black admixture was designed and its materials properties necessary for calculations of heat evolution by the action of an electric source were experimentally determined. The electrical conductivity of such material equal to 5.57?10?2 S m?1 was sufficiently high to ensure self-heating ability. It was observed good agreement of experimentally determined data with those modeled by means of heat equation on sample with dimensions 40 ? 40 ? 10 mm. Finally, one- and two-layered large-scaled heating elements based on materials with experimentally determined properties were designed and calculations were conducted to determine the voltage level necessary for one-hour heating from 268.15 K and 273.15 K to 278.15 K in the middle-top point of the construction.

Structural, Thermal and Electrical Properties of Doped Poly(3,4 ethylenedioxythiophene)

2016 ◽  
Vol 10 (4) ◽  
pp. 395-400 ◽  
Author(s):  
Deepali Kelkar ◽  
◽  
Ashish Chourasia ◽  
◽  
Keyword(s):  
Crystal Structure ◽  
Electrical Properties ◽  
Xrd Analysis ◽  
Structure Modification ◽  
Camphorsulfonic Acid ◽  
Thermal And Electrical Properties ◽  
Ft Ir

Poly(3,4-ethylenedioxythiophene) (PEDOT) was chemically synthesized, undoped and then re-doped using FeCl3 as well as camphorsulfonic acid (CSA). FT-IR results confirm the nature of the synthesized and doped samples. XRD analysis indicates crystal structure modification after doping and was also used to calculate crystallinity of samples. Crystallinity increases after FeCl3 doping, whereas it reduces due to CSA doping. TGA-DTA results show reduction in Tg value for FeCl3 doped sample while it increases for CSA doped samples compared to that of undoped PEDOT. Reduction in Tg indicates plasticizing effect of FeCl3 whereas increase in Tg show anti-plasticizing effect of CSA in PEDOT. Conductivity value () increases by two orders of magnitude after doping. Log vs. 1/T graph show metallic nature of undoped PEDOT above 308 K, however both doped samples show semiconducting nature from 301 to 383 K.

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