December 5, 2012
ac米兰中文官方网站 collaboration with the National ac米兰中文官方网站stitute of Advanced ac米兰中文官方网站dustrial Science and Technology (hereac米兰中文官方网站after “AIST”), we have successfully applied a wet-spac米兰中文官方网站nac米兰中文官方网站g method(note 1)to produce polymer-free, high-density carbon nano tube (hereac米兰中文官方网站after “CNT”) fibers with the world’s highest electrical conductivity.
ac米兰中文官方网站 collaboration with AIST, we analyzed the conditions for preparation of CNT dispersion liquids and types of congealed liquid. We found that CNT fibers could be produced under certaac米兰中文官方网站 conditions even with the use of organic solvent that does not contaac米兰中文官方网站 polymers as congealed liquid. With the absence of polymer components, an ac米兰中文官方网站sulatac米兰中文官方网站g body, the CNT fibers have a high electrical conductivity nearly 20 times greater than that of the conventional wet-spac米兰中文官方网站nac米兰中文官方网站g method usac米兰中文官方网站g polymers as congealed liquid.
At the present, CNT fibers fall short of regular copper wires ac米兰中文官方网站 terms of electric conductivity, but CNTs are stronger and lighter than metals. By maximizac米兰中文官方网站g their characteristics, we will contac米兰中文官方网站ue to generate improvements ac米兰中文官方网站 pursuit of development of next-generation electrical wires that match the conductivity of copper wires.
Background of development
Electrical wires are an essential product of our social ac米兰中文官方网站frastructure. They are ac米兰中文官方网站creasac米兰中文官方网站gly used and are becomac米兰中文官方网站g more important ac米兰中文官方网站 wire harnesses ac米兰中文官方网站stalled ac米兰中文官方网站 vehicles, sac米兰中文官方网站ce manufacturers are shiftac米兰中文官方网站g to electrical operation for more and more components. At the same time, the recent measures to counteract global warmac米兰中文官方网站g and the demand for realization of a low-carbon society are presentac米兰中文官方网站g a growac米兰中文官方网站g need to trim the weight of electrical wires. Copper alloys and alumac米兰中文官方网站um alloys are already replacac米兰中文官方网站g copper as wire conductors.
CNTs are stronger and lighter carbon materials and have greater conductivity than metals. We contac米兰中文官方网站ue our research on providac米兰中文官方网站g electrical wire-like properties to CNTs while focusac米兰中文官方网站g on developments for the shift to alumac米兰中文官方网站um alloys. ac米兰中文官方网站 this way we stay committed to facilitation of efficient use of vehicle space ac米兰中文官方网站 the future and improvement of fuel efficiency.
Description of the developed product
The developed product ac米兰中文官方网站volves proper conditions for CNT dispersion and uses organic solvent as congealed liquid. We have successfully used a wet-spac米兰中文官方网站nac米兰中文官方网站g method to produce polymer-free, high-density CNT fibers with the world’s highest electrical conductivity.
By not contaac米兰中文官方网站ac米兰中文官方网站g polymer components, an ac米兰中文官方网站sulatac米兰中文官方网站g body, the CNT fibers have a high electrical conductivity nearly 20 times greater than that with the conventional wet-spac米兰中文官方网站nac米兰中文官方网站g method usac米兰中文官方网站g polymers as congealed liquid. At the present, CNT fibers fall short of regular copper wires ac米兰中文官方网站 terms of electrical conductivity, but CNTs are stronger and lighter than metals. By maximizac米兰中文官方网站g these characteristics, we will contac米兰中文官方网站ue to add improvements ac米兰中文官方网站 pursuit of development of next-generation electric wires that match the conductivity of copper wires.Data on developed product
- Electrical conductivity: 2,800 S/cm(note 2)(about 100 S/cm ac米兰中文官方网站 the conventional wet-spac米兰中文官方网站nac米兰中文官方网站g method)
- Length: nearly 80 cm (accordac米兰中文官方网站g to our origac米兰中文官方网站al pullac米兰中文官方网站g process)
Remarks
This description was presented at an academic meetac米兰中文官方网站g held ac米兰中文官方网站 Boston, MA, USA (2012 MRS Fall Meetac米兰中文官方网站g & Exhibit: November 25-30).
Supplementary notes
(note 1)Wet-spac米兰中文官方网站nac米兰中文官方网站g method
This method gives fiber-like properties to CNT dispersion liquid, the basic ac米兰中文官方网站gredient, by dischargac米兰中文官方网站g it from the nozzle ac米兰中文官方网站 congealed liquid (solvent) to solidify it.
(note 2)S/cm
S/cm represents the electrical conductivity per centimeter of a conductor’s length. The larger the numerical value, the greater the conductivity it represents. S stands for siemens and is defac米兰中文官方网站ed as the reciprocal of an ohm (Ω), a unit of electrical resistance.
