{"id":21168,"date":"2014-05-24T06:22:00","date_gmt":"2014-05-24T04:22:00","guid":{"rendered":"https:\/\/www.opc.cat\/grafeno-y-el-numero-12-para-definir-la-constante-de-avogadro-2\/"},"modified":"2014-05-24T06:22:00","modified_gmt":"2014-05-24T04:22:00","slug":"grafeno-y-el-numero-12-para-definir-la-constante-de-avogadro-2","status":"publish","type":"post","link":"https:\/\/www.opc.cat\/es\/grafeno-y-el-numero-12-para-definir-la-constante-de-avogadro-2\/","title":{"rendered":"Grafeno y el n\u00famero 12 para definir la constante de Avogadro"},"content":{"rendered":"<div class=\"separator\" style=\"clear: both; text-align: center;\">\n<a href=\"http:\/\/www.technologyreview.com\/sites\/default\/files\/images\/Avogadro.png\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img fetchpriority=\"high\" decoding=\"async\" border=\"0\" src=\"http:\/\/www.technologyreview.com\/sites\/default\/files\/images\/Avogadro.png\" height=\"270\" width=\"320\" \/><\/a><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: center;\">\n<\/div>\n<p>El Sistema Internacional de Unidades (SI) es uno de los fundamentos de la ciencia moderna. Est\u00e1 compuesto de siete unidades de base a partir de las que se pueden derivar todas las dem\u00e1s.<\/p>\n<p>Son el metro para la longitud, el kilogramo para la masa, el segundo para el tiempo, el amperio para la corriente el\u00e9ctrica, el Kelvin para la temperatura termodin\u00e1mica, la candela para la intensidad luminosa, y el mol para la cantidad de sustancia. Es un sistema coordinado de unidades que permite comparar los resultados cient\u00edficos con relativa facilidad, independientemente del lugar donde se realicen.<\/p>\n<p>Sin embargo, el SI no es ni mucho menos perfecto. Uno de los problemas es que algunas de las unidades tienen valores basados \u200b\u200ben objetos arbitrarios, como el kilogramo. Existe un acuerdo general de cambio, para que las unidades se basen en las constantes fundamentales de la naturaleza y en n\u00fameros espec\u00edficos definidos y, por tanto, constantes.<\/p>\n<p>Uno de estos n\u00fameros es la constante de Avogadro. Actualmente est\u00e1 definida como el n\u00famero de \u00e1tomos en 12 gramos de carbono-12 y su valor aproximado conocido es de 6,02214129\u00d71023. Sin embargo, el n\u00famero exacto depende de la definici\u00f3n de kilogramo, que por el momento se define como la masa de una arbitraria barra de aleaci\u00f3n de platino-iridio escondida en un lugar seguro, en Par\u00eds (Francia).<\/p>\n<p>El consenso general es que ser\u00eda mejor definir la constante de Avogadro y dejar que \u00e9sta determine la masa del kilogramo. Pero, \u00bfqu\u00e9 n\u00famero habr\u00eda que usar?<\/p>\n<p>Phil Fraundorf, desde la Universidad de Missouri-St Louis (EEUU), nos presenta una sugerencia interesante. Asegura que una soluci\u00f3n pr\u00e1ctica es elegir un n\u00famero que sea divisible por 12, de manera que un n\u00famero entero de \u00e1tomos de carbono-12 sea igual a la masa de un gramo, al menos en una primera aproximaci\u00f3n.<\/p>\n<p>Al mismo tiempo, ser\u00eda \u00fatil contar con una definici\u00f3n f\u00edsica significativa basada en una estructura que pudiera existir razonablemente en la naturaleza. Varios investigadores han sugerido un cubo de silicio con cristales c\u00fabicos centrados con forma de diamante o un cubo de carbono c\u00fabico centrado.<\/p>\n<p>El problema es que estas estructuras son casi imposibles de fabricar y en cualquier caso no contienen un n\u00famero de \u00e1tomos que sea divisible por 12.<\/p>\n<p>As\u00ed que Fraundorf ha ideado algo mejor bas\u00e1ndose en el grafeno, es decir, hojas individuales de \u00abalambrada\u00bb de carbono, que actualmente son objeto de intensas investigaciones. Su idea es definir la constante de Avogadro en t\u00e9rminos de un n\u00famero de hojas hexagonales de grafito apiladas unas sobre otras para formar un prisma hexagonal.<\/p>\n<p>Ha mostrado que si el n\u00famero de capas es igual al n\u00famero de \u00e1tomos a lo largo de un lado de la base del hex\u00e1gono, esa estructura siempre tendr\u00e1 un n\u00famero de \u00e1tomos que sea divisible por 12, tal y como se requiere. As\u00ed que es simplemente una cuesti\u00f3n de elegir un n\u00famero que produzca un prisma con un n\u00famero de \u00e1tomos cercano al valor actual de la constante de Avogadro.<\/p>\n<p>Sugiere que si este n\u00famero, el n\u00famero de capas y el n\u00famero de \u00e1tomos a lo largo de cada lado del hex\u00e1gono, fuera igual a 51.150.060, el total ser\u00edan 602.214.158.510.196.804.982.800 \u00e1tomos. Eso es lo m\u00e1s cercano al n\u00famero actual, o incluso casi igual.<\/p>\n<p>Afirma que un cristal de carbono creado de esta manera tendr\u00eda 1,71 cent\u00edmetros de altura, y cada uno de los seis lados medir\u00eda 1,09 cent\u00edmetros de largo.<\/p>\n<p>Es una idea interesante, sobre todo porque nuestra capacidad de manipular el grafeno est\u00e1 mejorando a pasos agigantados. Fraundorf cree que en un futuro no muy lejano podremos usar la tecnolog\u00eda de impresi\u00f3n en 3D para construir un prisma con el n\u00famero exacto de \u00e1tomos de Avogadro.<\/p>\n<p>Se tratar\u00eda de un objeto fascinante nos proporcionar\u00eda una idea concreta del espacio ocupado por un mol de materia, as\u00ed como del peso de un mol de carbono. \u00abEl peso de un mol de otros \u00e1tomos ser\u00e1 proporcionalmente m\u00e1s pesado o m\u00e1s ligero seg\u00fan la relaci\u00f3n entre los pesos at\u00f3micos\u00bb, afirma.<\/p>\n<p>Y adem\u00e1s de s\u00f3lo contar con un kilogramo en una b\u00f3veda en Par\u00eds (y unas cuantas copias en otros lugares), cualquiera podr\u00eda imprimir su propio kilogramo en cualquier lugar del planeta (al menos en principio).<\/p>\n<p>Por supuesto existe un continuo debate alrededor del tema, y se est\u00e1n considerando otras propuestas. Sin embargo, la idea de Fraundorf parece eminentemente razonable y sin duda merece un estudio m\u00e1s detallado.<\/p>\n<div>\n<\/div>\n<div style=\"text-align: right;\">\n<i>Fuente: <a href=\"http:\/\/www.technologyreview.es\/blog\/post.aspx?bid=359&amp;bpid=30383\" target=\"_blank\">MIT Technology Review<\/a><\/i><\/div>\n","protected":false},"excerpt":{"rendered":"<p>El Sistema Internacional de Unidades (SI) es uno de los fundamentos de la ciencia moderna. Est\u00e1 compuesto de siete unidades de base a partir de las que se pueden derivar todas las dem\u00e1s. Son el metro para la longitud, el kilogramo para la masa, el segundo para el tiempo, el amperio para la corriente el\u00e9ctrica, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":24383,"comment_status":"","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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