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Stable thermochromic polymer films with vanadium dioxide nanowires

a technology of vanadium dioxide nanowires and thermochromic polymer films, applied in the direction of thermosensitive paints, etc., can solve the problem of undesirable heating of an enclosed spa

Inactive Publication Date: 2016-09-08
KONICA MINOLTA LAB U S A INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a device and method that uses vanadium dioxide nanowires to control heating in response to infrared radiation. The device includes a film with vanadium dioxide nanowires embedded in it. These nanowires have the ability to change from a non-conducting phase to a conducting phase at a specific temperature. In the method, infrared radiation is received on one side of the film and transmitted to the other side by the nanowires, which results in a phase change and the reflectance of the infrared radiation. The device and method can be used in various applications such as heating control in buildings and vehicles. The manufacturing process involves hot extruding a polymer with vanadium dioxide nanowires to create a rough film.

Problems solved by technology

Ambient infrared radiation may cause undesirable heating of an enclosed space by radiating into the enclosed space through an infrared transmitting window.

Method used

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  • Stable thermochromic polymer films with vanadium dioxide nanowires
  • Stable thermochromic polymer films with vanadium dioxide nanowires
  • Stable thermochromic polymer films with vanadium dioxide nanowires

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Embodiment Construction

[0025]Specific embodiments will now be described with reference to the accompanying figures. In the following description, numerous details are set forth as examples of the invention. It will be understood by those skilled in the art that one or more embodiments of the present invention may be practiced without these specific details and that numerous variations or modifications may be possible without departing from the scope of the invention. Certain details known to those of ordinary skill in the art are omitted to avoid obscuring the description.

[0026]Embodiments of the invention relate to thermochromic films. As discussed above, thermochromic films may change their reflection, transmission, and absorption characteristics of incident infrared radiation based on a temperature of the film. In one or more embodiments of the invention, a thermochromic film includes a polymer matrix and vanadium dioxide nanowires disposed within the polymer matrix. The polymer matrix imparts the ther...

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Abstract

A thermochromic device includes a film and a number of vanadium dioxide nanowires disposed within the film. Each of the number of vanadium dioxide nanowires may have an aspect ratio between 10 and 500. The vanadium dioxide nanowires may have a length between 1 micrometer and 10 micrometers. The vanadium dioxide nanowires may have a non-conducting to conductor phase change temperature between 20 degrees Celsius and 60 degrees Celsius.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a non-provisional patent application of and claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application Ser. No. 62 / 129,363, filed on Mar. 6, 2015, and entitled: “STABLE THERMOCHROMIC POLYMER FILMS WITH VANADIUM DIOXIDE NANOWIRES.” The above Provisional Application is hereby incorporated in its entirety.FIELD OF THE INVENTION[0002]The present invention relates generally to thermochromic polymer films.BACKGROUND[0003]Ambient infrared radiation may cause undesirable heating of an enclosed space by radiating into the enclosed space through an infrared transmitting window. For example, motor vehicles include windows that, in addition to allowing the driver to see his or her surroundings, act as infrared transmitting windows. One method of regulating transmission of infrared radiation as well as the interior temperature of an enclosed space is through the use of a thermochromic film. A thermochromic mater...

Claims

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Application Information

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IPC IPC(8): C09D5/26B29C71/00B29C47/00B29C48/08
CPCC09D5/26B29C47/0057B29C47/0021B29C71/0072B29K2067/003B29K2105/162B29K2505/08B29K2995/0018B29C71/0081B29C71/04B29C2035/0822C08K3/22C08K7/08C08K9/02C08K2201/003C08K2201/011B29C48/08B29C48/0018
Inventor AMANO, JUN
Owner KONICA MINOLTA LAB U S A INC