Thermoelectric nanomaterials

A technology of thermoelectricity and nanotubes, applied in the field of thermoelectric heating, nanowires and nanotubes, sensors or thermal control, and power generation, can solve the problems of control, channel blockage, and discontinuity of nanowires And other issues

Inactive Publication Date: 2009-03-18
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, deposition of vapor-phase material in very narrow channels can lead to channel blockage, resulting in discontinuous nanowires
Experimental or applied contacting of short nanowires embedded in arrays is difficult
Therefore, there is a problem with the control of the number of nanowires actually contacted and the experimental results thus obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0179] Fabrication of nanotubes:

[0180] The template for bismuth nanotubes was electrospun PA66 fibers.

[0181] Fiber Manufacturing:

[0182] A solution of 15% m / m PA66 in formic acid (p.a. 98-100%) was spun. The yarn was spun from a PE injector with a metal sleeve (Φ0.6 mm) onto a rotating aluminum cylinder with a diameter of 155 mm rotating at a speed of 3500 rpm. The applied voltages were +22 kV on the syringe cannula and -2 kV on the cylinder (both with respect to ground) at a cannula / roller separation of approximately 60 mm (electric field strength E = 400 kV / m). The thrust on the syringe is adjusted appropriately so that solution is continuously available at the cannula tip.

[0183] For better fiber production, aluminum foil or PE film is applied to the drum on which the fibers are deposited. To ensure good fiber removal from the film, multiple layers of fibers must be deposited. This makes at least 15 to 30 minutes of spinning necessary. The applied film or f...

example 2

[0188] Nanowires were fabricated by incorporating Bi salts at the time of spinning.

[0189] Manufacture of poly-D,L-lactide / BiCl 3 Nanofibers:

[0190] For 11% PDLLA / 16.5% BiCl 3 (m / m) solution in acetone for spinning. The yarn was spun from a PE syringe with a metal sleeve (Φ0.45 mm) onto a rotating aluminum drum (Φ155 mm, 3500 rpm). The applied voltages were +13 kV on the syringe cannula and -2 kV on the cylinder (both with respect to ground) at a cannula / roller separation of approximately 60 mm (electric field strength E = 250 kV / m). The thrust on the syringe is adjusted appropriately so that solution is continuously available at the cannula tip.

[0191] For better production of the fibers, the PE film is applied to the drum on which the fibers are deposited. To ensure good fiber removal from the membrane, multiple strand layers must be deposited. This makes it necessary to carry out spinning for at least 10 to 20 minutes. The applied film comprising fibers is cut ...

example 3

[0204] Production of nanowires by incorporating Bi particles in spinning:

[0205] Fabrication of Bi nanoparticles:

[0206] The fabrication was performed under argon.

[0207] A clamped Schlenk vessel was first filled with 25 mmol of sodium hydride NaH, which was degassed and washed twice with absolute tetrahydrofuran THF, then 20 ml of TFH were added and the mixture was heated to 65°C. 10 mmol of tert-butanol were added to 5 ml of THF, and the suspension was stirred for a while. With vigorous stirring, add (all in one go) 5 mmol of finely powdered BiCl 3 , and keep the solution at 65 °C for half an hour. Immediately after the addition, the solution started to turn black. Subsequently, the solution was cooled to RT and 20 ml of absolute THF were added, then the mixture was stirred overnight and concentrated by rotary evaporation. A black powder with a particle size of approximately 5 nm under the electron microscope remained.

[0208] Fabrication of poly-D,L-lactide / Bi ...

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Abstract

The present invention relates to processes for producing nanowires and nanotubes by treating a fiber comprising at least one support material and at least one thermoelectrically active material or a precursor compound of a thermoelectrically active material, to a nanowire comprising at least one thermoelectrically active material and having a diameter of <=200 nm and a length of >=1 mm, to nanotubes comprising at least one thermoelectrically active material and having a diameter of <=200 nm, a wall thickness of <=30 nm and a length of >=1 mm, and to the use of the nanowires or nanotubes for thermoelectric heating, for electricity generation, in sensors or for temperature control.

Description

technical field [0001] The present invention relates to processes for the preparation of nanowires or nanotubes by electrospinning melts or solutions of suitable support materials, including thermoelectric materials, if appropriate, and to nanowires and nanotubes, and to nanowires or nanotubes Applications in thermoelectric heating, power generation, sensors or thermal control. technical background [0002] In the field of thermoelectric energy conversion, it is very important to find new and efficient thermoelectric active materials. Thermoelectric materials are characterized by a so-called figure of merit Z, usually expressed as a dimensionless parameter ZT. This parameter ZT must be maximized for maximum efficiency. [0003] ZT=S 2 σT / λ [0004] S: Seebeck coefficient, μV / K [0005] σ: conductivity, S / cm [0006] T: temperature, K [0007] λ: thermal conductivity, W / (mK) [0008] Since its discovery 50 years ago as a particularly advantageous material for cooling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00H01L35/14H01L35/34B29C48/92H10N10/01H10N10/851
CPCD01F1/10H01L35/34H01L35/16D01D5/0007H10N10/852H10N10/01D01D5/00B82B3/00B82Y40/00H10N10/851
Inventor K·屈林M·格雷泽尔J·H·文多夫A·格赖纳
Owner BASF AG
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