- published: 17 Jan 2014
- views: 25416
ALD, Ald or ald may refer to:
Atomic layer deposition (ALD) is a thin film deposition technique that is based on the sequential use of a gas phase chemical process. ALD is considered a subclass of chemical vapour deposition. The majority of ALD reactions use two chemicals, typically called precursors. These precursors react with the surface of a material one at a time in a sequential, self-limiting, manner. Through the repeated exposure to separate precursors, a thin film is slowly deposited. ALD is a key process in the fabrication of semiconductor devices, and part of the set of tools available for the synthesis of nanomaterials.
Atomic Layer Deposition (ALD) is a thin film deposition method in which a film is grown on a substrate by exposing its surface to alternate gaseous species (typically referred to as precursors). In contrast to chemical vapor deposition, the precursors are never present simultaneously in the reactor, but they are inserted as a series of sequential, non-overlapping pulses. In each of these pulses the precursor molecules react with the surface in a self-limiting way, so that the reaction terminates once all the reactive sites on the surface are consumed. Consequently, the maximum amount of material deposited on the surface after a single exposure to all of the precursors (a so-called ALD cycle) is determined by the nature of the precursor-surface interaction. By varying the number of cycles it is possible to grow materials uniformly and with high precision on arbitrarily complex and large substrates.
What is ALD? Adrenoleukodystrophy is a devastating genetic disease that affects the myelin around neurons in the brain and spinal cord. Learn the biology underlying the disease and what potential treatments may come from ALD research. This video was produced in collaboration with ALD Connect (www.aldconnect.org)
Karen Harrison and Sara Hunt give personal accounts about being a mother of a son who has ALD. This independent film was made for ALD Life (www.aldlife.org) by Sara Macham, Marvin Nadalutti and Judit Serra, MA students at the University of Westminster as part of their degree.
ALD - Atomic Layer Deposition is an exciting technique to prepare desired materials one atomic layer at a time. In this video we explain the deposition process with an ALD reactor that uses gas phase precursors (chemicals). These precursors enter the reaction chamber one at a time along with the carrier gas (usually nitrogen in gas phase processes). Each time a precursor enters the chamber, it reacts with the substrate surface in a self limiting manner, forming a thin layer. The excess precursor molecules and reaction byproducts are removed after each step with the help of the carrier gas and a vacuum pump. A thermocouple and computer controlled heaters ensure the desired deposition temperature, which gives control over the deposited films crystal structure. For example by using a correct ...
Adrenoleukodystrophy, or ALD, is a rare x-linked genetic disease which often results in serious disability or death in males, primarily in boys between the ages of 4 and 10. There is no effective treatment for ALD, and stem cell transplant offers males the best chance for long-term survival. Females are carriers of ALD and have a 50/50 chance of passing the disease on to their children. In addition, most females develop some physical symptoms of the disease after age 35, such as stiffness and numbness of their legs, loss of balance and coordination, and bowel and bladder dysfunction. Women usually learn that they are ALD carriers after a male relative, such as a brother, father or son, is diagnosed with, or dies from ALD. However, with the recent advent of ALD newborn screening which wil...
1 out of 17,000 people could suffer from Adrenoleukodystrophy or ALD. This rare disease ruins the nerve cells that allow a person to think and to control the muscles. Subscribe to us! http://www.youtube.com/user/GMAPublicAffairs?sub_confirmation=1 Find your favorite GMA Public Affairs and GMA News TV shows online! http://www.gmanews.tv/publicaffairs http://www.gmanews.tv/newstv
O jovem Guilherme de 06 anos de idade mora em Água Boa e sofre da doença rara chamada ALD (adrenoleucodistrofia), doença esta conhecida pelo filme baseado em fatos reais chamado Óleo de Lorenzo (1992). Reportagem: Joatan de Souza Imagens: Isaac Coelho TV Vale
Presento una de mis nuevas canciones que conlleva el nombre de Fuera de Mi Caminoo: DISCULPEN la demora y DISCULPEN que no aya salido el video como yo esperava , algunas personas me quedaron mal, varias veces y para no quedarles mal a ustedes decidi subirlo con lo que te nia a la mano espero y les agrade y de nuevo una DISCULPA. LINK DE DESCARGA: http://www.mediafire.com/download/b96f51ipu87pnms/Fuera+de+mi+camino-++ALD.mp3 PAGINA OFICIAL ALD: https://www.facebook.com/ALD-Y-J-Vasquez-1392837231038522/?ref=hl DANY EN EL BEAT ESCRITA E INTERPRETADA POR: ALAN DAVID MC STEVE EN LOS CONTROLES BG RECORDS NEW ESSENCE DIRECCION Y GRAVACION: ALAN Y ERICK RIVERA
Video courtesy of Beneq. ALD is based on surface controlled thin film deposition. During coating, two or more chemical vapors or gaseous precursors react sequentially on the substrate surface, producing a solid thin film. Most ALD coating systems utilize a flow--through traveling wave setup, where an inert carrier gas flows through the system and precursors are injected as very short pulses into this carrier flow. The carrier gas flow takes the precursor pulses as sequential "waves" through the reaction chamber, followed by a pumping line, filtering systems and, eventually, a vacuum pump.
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