"In the state of art the tubes have perfect crystalline nets but the inventive doping generates imperfections in the tubes, therefore the graphitic net is not perfect.
"Firstly: the term 'doped tubes' is applicable to a substitution of elements in the arrangement of a non-perfect graphitic net, wherein three types of doping are:
"Type I: carbon atom substitution (with any atom available) in the graphitic net with no vacancy.
"Type II: carbon atom substitution (with any atom available) in the graphitic net with vacancy.
"Type III: carbon atom substitutions (with hydrogen --H, or carbonyl or carboxyl groups --COH or COOH) with sites having general vacancy.
"In all cases, 'x' ranges from 0.1 to 10% at (atomic percent), x=H, N, P, OX, S, Si, Se, B . . . carbonyl, carboxyl groups, including any combination or permutations.
"Second: In addition to the doping, the tube dimensions and also the aspect ratio are different with respect to the art or works previously referred to.
"Third: in the described nanostructured concrete of the invention, combinations of nanomaterials are given but reinforce mechanisms are different: 1. With multiple wall or multilayer nanotubes (MWNT'S), with an imperfect graphitic net, having diminished Type III doping (
"Fourth: The carbon nanotubes that perform better are those that are N-doped, and their structure is bamboo-type and this is not disclosed in any of the prior art patents and, in fact, they are not exactly tubes themselves based in their physical structure.
"The applications of a concrete manufactured according to the present invention are as wide as the use of concrete itself in these days. For example, its use in the construction industry is not limited to a particular sector, encompassing small projects to the greatest civil constructions such as dams, power stations, communication paths, and complex buildings with great size and volume. It is useful in also the housing sector wherein applicability of this material is of great importance for the following reasons: As the inventive concrete has greater strength than the usual concrete, less amounts of concrete are required for the construction of housing structural elements, and therefore more habitable area is available. As the structural elements involved have less thickness, the relative weight of such elements is also less; therefore, the handling of same is simplified and less personnel or labor is required for handling thereof. As the structural elements are lighter and more easily handled, their manufacturing is simplified in controlled environments for pre-manufacturing a structure, allowing the industrialization of concrete pre-manufactured houses. By diminishing the amount of cement used, the ecology is preserved as a ton of cement produced is equivalent to a ton of CO.sub.2 produced. Decorative elements of any type of facades will require less thickness to support pressures caused by winds and their usual strength demands, and therefore it means a lower weight of the main structure saving in this manner the basement costs of structure."
URL and more information on this patent application, see:
Keywords for this news article include: Nitrogen, Chalcogens, Fullerenes, Nanoplates, Legal Issues, Nanostructural, Nanostructures, Nanotechnology, Carbon Nanotubes, Emerging Technologies, Urbanizaciones Inmobillarias Del
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