Recent Development of Cathodes used for Cathode Ray Tubes.

Miniature X-ray Tubes Utilizing Carbon-nanotube-based Cold Cathodes

The electron field-emission properties of carbon nanotubes enable the fabrication of cold cathodes for a variety of vacuum device applications. The utilization of these cathodes is an attractive alternative for the replacement of thermionic or hot cathodes for generating X-rays. Miniature X-ray tubes have been fabricated using triode-style carbon nanotubebased cathodes. In this paper we report ...

Recycling of Cathode Ray Tubes (CRTs) in electronic waste

Carbon nanotube cold cathodes for application in low current x-ray tubes*

Low current x-ray tubes operating at 25–40 kV have been developed using monolithic carbon nanotube CNT cold cathodes as electron sources. The authors have tested CNT cathodes from various sources. They were systematically evaluated and conditioned in a vacuum chamber and then went through high temperature baking and high voltage processing of standard tube production processes. Acceptance crite...

Do liquid crystal displays assure better readability than cathode-ray tubes?

Flat-panel displays, especially liquid crystal displays (LCDs), are now firmly established as important devices for information displays. But do LCDs assure better readability than cathode-ray tubes (CRTs)? We carried out an experiment using four types of displays: negative and positive CRTs, and LCDs with and without backlighting. A syllable-checking task using the Japanese katakana alphabet w...

Development and evaluation of carbon and binder loading in low-cost activated carbon cathodes for air-cathode microbial fuel cells{

Activated carbon (AC) air cathodes were constructed using variable amounts of carbon (43–171 mg cm) and an inexpensive binder (10 wt% polytetrafluoroethylene, PTFE), and with or without a porous cloth wipe-based diffusion layer (DL) that was sealed with PDMS. The cathodes with the highest AC loading of 171 mg cm, and no diffusion layer, produced 1255 ¡ 75 mW m and did not appreciably vary in pe...