Conductive PET Fibers with Magnetocaloric Doping
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Solution Overview
Problem
Existing materials for radiation absorption and generation, particularly at high temperatures, lack cost-effective production methods and efficient combinations of mechanical strength, electrical conductivity, and magnetocaloric effects, with known alloys exhibiting weak magnetocaloric effects and undesirable hysteresis.
Innovation Solution
Development of PET fibers doped with metallic elements, such as MnFe phosphorus compounds, which provide electrical conductivity, enhanced mechanical properties, and strong magnetocaloric effects, allowing for controlled radiation absorption and generation, as well as improved cooling capabilities, through a combination of thermal and electrical energy emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic elements are incorporated into PET to provide electrical conductivity, then electrical conductivity is improved, but production cost increases
Solution Approach 1:
The patent changes the chemical composition parameters of PET by incorporating specific metallic elements (Fe, Mn, Co, Ni, Cu, Zn, Mo, W, Si, B) in optimized quantities. This allows the material to achieve electrical conductivity while maintaining cost-effectiveness through selective doping rather than using expensive pure conductive materials.
Solution Approach 2:
The patent creates a composite material by combining PET base material with metallic elements. This composite approach allows the polymer to retain its mechanical properties while gaining electrical conductivity, avoiding the need to use entirely different expensive conductive materials.
2Power
If strong magnetocaloric alloys are used to achieve strong magnetocaloric effects, then cooling capability is improved, but hysteresis behavior worsens
Solution Approach 1:
The patent optimizes the concentration parameters of metallic elements (particularly Fe and Mn) within the PET matrix to achieve strong magnetocaloric effects. By controlling the amount and distribution of these elements, the material exhibits enhanced cooling capability with reduced hysteresis compared to traditional strong-magnetocaloric alloys.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The PET composite material achieves efficient radiation absorption and generation, combined with enhanced mechanical strength and cooling effects, using environmentally friendly doping elements that optimize heat emission and absorption across a wide temperature range.
Implementation Method 1
PET materials are made from monomers such as terephthalic acid or benzene dicarboxylic acid and ethylene glycol or dihydroxyethane or ethanediol. In order to be able to produce quantities that are relevant for commercial application, large-scale production is carried out by transesterification of dimethyl terephthalate with ethanediol.
Implementation Method 2
It is also known that various, predominantly metallic materials such as alloys with gadolinium or other rare earth metals have a magnetocaloric effect. In the case of the magnetocaloric effect, the material heats up when exposed to a magnetic field and cools down again when the influence of the magnetic field is removed.
Implementation Method 3
The PET composite material achieves efficient radiation absorption and generation, combined with enhanced mechanical strength and cooling effects, using environmentally friendly doping elements that optimize heat emission and absorption across a wide temperature range.
Data Source
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AI summary
The fiber is made of plastic and is electrically conductive. The fiber material is formed from a PET base material. Elements are embedded in the base material. These elements are atomic in size and their electron clouds overlap, at least partially.