A novel flexible room temperature positive temperature coefficient material for thermal management

2019 ◽  
Vol 2 (1) ◽  
pp. 83-92 ◽  
Author(s):  
Ruo-Jiang Wang ◽  
Wen-Long Cheng
Keyword(s):  
Temperature Coefficient ◽  
Thermal Management ◽  
Room Temperature ◽  
Positive Temperature Coefficient ◽  
Positive Temperature

scholarly journals Development of Auto Thermal Control Device For Space Air - Conditioning

2021 ◽  
pp. 193-204
Author(s):  
Akinde Olusola Kunle ◽  
Maduako Kingsley Obinna ◽  
Akande, Kunle Akinyinka ◽  
Adeaga Oyetunde Adeoye
Keyword(s):  
Temperature Coefficient ◽  
Room Temperature ◽  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Thermal Control ◽  
Positive Temperature Coefficient ◽  
Control Device ◽  
Thermal Source ◽  
Positive Temperature ◽  
Ntc Thermistor

Auto Thermal Control device is an electronic based device which employs the application of temperature sensors to controlling household appliances without human interference directly. In this work, thermal source is used to regulate electrical fan and room heater depending on ambient temperature. The room heater, which is adjusted to a set temperature, switches ‘ON’ when the temperature of a room is low (cold). While the same is switches ‘OFF’ with increase in the room temperature. This triggers ‘ON’ an electric fan at different speeds, and thus cools the room. A temperature sensor, tthermistor, monitors change in room temperature. Two types of thermistor exists: Positive Temperature Coefficient, PTC. An increasee in the resistance of PTC results in increasee in temperature). In the Negative Temperature Coefficient, NTC; a decreasee in resistance yields to temperature increase. This article explored a NTC thermistor. The design could be a ready product in the market of the developing nation where environmental automation is yet fully deployed.

scholarly journals A New Thermal Controlling Material with Positive Temperature Coefficient for Body Warming: Preparation and Characterization

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1758 ◽  
Author(s):  
Jing Li ◽  
Chang Chang ◽  
Xue Li ◽  
Yang Li ◽  
Guoqiang Guan
Keyword(s):  
Temperature Coefficient ◽  
Thermal Cycle ◽  
Room Temperature ◽  
Ethylene Vinyl Acetate ◽  
Positive Temperature Coefficient ◽  
Dioctyl Phthalate ◽  
Positive Temperature ◽  
Cold Environment ◽  
Temperature Range ◽  
Great Potential Application

Positive temperature coefficient (PTC) materials have many applications in self-regulating heating; however, they are generally used in the high temperature range, and their use in the room temperature range have rarely been reported. A new kind of PTC material with the Curie temperature of 37 °C was proposed in this study. The material was prepared by adding 6wt % carbon black (CB) and 5wt % dioctyl phthalate (DOP) into the copolymer of ethylene vinyl acetate (EVA) and lauric acid (LA) (1:3). The results showed that it had an exceptionally high PTC intensity of 5.5 and rationally low electrical resistivity of 600 Ω·cm. at room temperature. And this PTC material also shows a preferable repeatability in the PTC intensity after the thermal cycle of 4th. Moreover, the PTC material shows a great potential application in warming the human body in a cold environment.

THE MERCURY PHOTOSENSITIZED REACTIONS OF NEOPENTANE

1949 ◽  
Vol 27b (4) ◽  
pp. 181-189 ◽  
Author(s):  
B. deB. Darwent ◽  
E. W. R. Steacie
Keyword(s):  
Quantum Yield ◽  
Hydrogen Production ◽  
Temperature Coefficient ◽  
Room Temperature ◽  
Initial Step ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Presence And Absence

The mercury photosensitized reactions of neopentane have been investigated at pressures between 50 and 400 mm. of mercury and between 25° and 200 °C., in the presence and absence of hydrogen. The products are largely hydrogen and dineopentyl. The quantum yield of hydrogen production is 0.004 at room temperature and has a positive temperature coefficient corresponding to E = 4.3 kcal.mole−1. The facts are consistent with the reactions:—[Formula: see text]as the initial step. The majority of the reaction goes by (b), and the active molecules produced, C5H12*, are nearly all deactivated.

Investigation of PTCR characteristics in Nb2O5-doped BaTiO3-based chip-type ceramics prepared by reduction sintering-reoxidation method

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040047
Author(s):  
Xuxin Cheng ◽  
Xiaoming Chen ◽  
Haining Cui ◽  
Yuxin Wang ◽  
Chao Xiong
Keyword(s):  
Electrical Properties ◽  
Temperature Coefficient ◽  
Room Temperature ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Firing Time ◽  
Temperature Coefficient Of Resistance ◽  
Reducing Atmosphere ◽  
Chip Type ◽  
Sintering Conditions

This study investigates the influence of sintering conditions on electrical properties and positive temperature coefficient of resistance (PTCR) of [Formula: see text] (BTNO) ceramics, fired at [Formula: see text]C for different times from 1 to 6 h in a reducing atmosphere and reoxidised within the temperature range of [Formula: see text]–[Formula: see text]C for 1 h. The results showed that the room-temperature (RT) resistance and the resistance jump of the multilayer BTNO ceramics decreased with an increase in the firing time. Furthermore, the RT resistance of the BTNO samples gradually increased at first and then rapidly increased with increasing reoxidation temperature. In addition, the influence of sintering times on the microstructure of ceramics was also investigated.

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