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CARBON NANOTUBES

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No. 7 - March 2006

APPLICATION OF THE MONTH: Carbon nanotubes in nanoelectronics

Due to their small size and unique properties, carbon nanotubes have found a promising field of applications in electronics spanning vias, active devices, logic gates and even memory cells. In vertical interconnects (vias) carbon nanotubes are utilized as nanoscale wires in integrated circuits, while active devices refer to nanotube-based diodes and transistors. Logic gates and memories represent the most promising class of such applications, and are extremely likely to further benefit from the advances featured by the first two categories.

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ANATOMY OF A PATENTING AREA: Nanotube cutting

As a processing method, nanotube cutting aims either to shorten the carbon nanotubes or merely to open their caps. Generally, cutting is required prior to processes such as solubilization, purification or separation. In order to manipulate carbon nanotubes as individual macromolecules for various applications, they must be cut to shorter and operable lengths. Controlling nanotubes length is an important issue, as it improves specific features, in a broad range of applications, including drug delivery, field emission or nanoelectronics. On the other hand, nanotube tip opening favors better storage performance in catalyst support, filling and intercalation, doping, functionalization, or energy storage and conversion applications. As the following patents will reveal it, the available methods for nanotube cutting combine a range of physical and chemical approaches. The physical techniques comprise abrasion, grinding, ball milling, electrical cutting, gamma irradiation, chopping and sonication, whereas chemical methods mostly employ oxidation treatments and fluorination.
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RESEARCH PAPERS IN FEBRUARY (129)

Composite materials
Enhancement of thermal and electrical properties of carbon nanotube polymer composites by magnetic field processing
E. S. Choi; J. S. Brooks; D. L. Eaton; M. S. Al-Haik; M. Y. Hussaini; Hamid Garmestani; D. Li; K. Dahmen
Journal of Applied Physics, Volume 94, Issue 9, Pages 6034 - 6039, 2006-02-02

Drug delivery
Complement activation and protein adsorption by carbon nanotubes
Malcolm .L.H. Green; Emmanuel Flahaut; Jeremy Sloan; Carolina Salvador-Morales; Edith Sim; Robert B. Sim
Molecular Immunology, Volume 43, Issue 3, Pages 193 - 201, 2006-02-01

Chemical properties
Functionalization density dependence of single-walled carbon nanotubes cytotoxicity in vitro
Valerie C Moore; W. Eduard Billups; Kevin Ausman; Wenhua Guo; Christie M. Sayes; Feng Liang; Jared L. Hudson; Joe Mendez; Jonathan M. Beach; Condell D. Doyle; Jennifer L. West; Vicki L. Colvin
Toxicology Letters, Volume 161, Issue 2, Pages 135 - 142, 2006-02-20

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PATENTS MONITORING IN FEBRUARY (41)

Production
Plasma enhanced chemical vapor deposition system for forming carbon nanotubes
Inventor: KANG SUNG GU, BAE WOO KYUNG
Applicant: CDREAM CORP, KANG SUNG GU, (+1)
WO2006017340

Cutting
Shortened carbon nanotubes
Inventor: WILSON LON, BOLSKAR ROBERT
Applicant: UNIV RICE WILLIAM, TDA RES INC, (+2)
WO2006017333

Actuators / Composite materials
Photoactuators based on carbon nanotube-nafion composites
Inventor: LEVITSKY IGOR, KANELOS PETER, (+1) 
Applicant: RHODE ISLAND EDUCATION, LEVITSKY IGOR, (+2)
WO2006016907

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