Diamonds are Forever
Prikazujem rezultate 1 do 2 od 2

Tema: Diamonds are Forever

  1. #1
    Primećen član Sentient (avatar)
    Tekstova u blogu
    Reputaciona moć

    Podrazumevano Diamonds are Forever

    Napravljen je izuzetno vazan tehnoloski proboj u tehnologiji proizvodnje vestackih dijamanata, proboj koji ce imati dalekosezne posledice po brzinu tehnoloskog progresa, zbog implikacija koje ima na razvoj elektronike, sisteme za skladistenje vodonika kao goriva, itd:

    Artificial diamonds - now available in extra large.
    18:11 13 November 2008 by Catherine Brahic.

    A team in the US has brought the world one step closer to cheap, mass-produced, perfect diamonds. The improvement also means there is no theoretical limit on the size of diamonds that can be grown in the lab.

    A team led by Russell Hemley, of the Carnegie Institute of Washington, makes diamonds by chemical vapour deposition (CVD), where carbon atoms in a gas are deposited on a surface to produce diamond crystals.

    The CVD process produces rapid diamond growth, but impurities from the gas are absorbed and the diamonds take on a brownish tint.

    These defects can be purged by a costly high-pressure, high-temperature treatment called annealing. However, only relatively small diamonds can be produced this way: the largest so far being a 34-carat yellow diamond about 1 centimetre wide.

    Microwaved gems
    Now Hemley and his team have got around the size limit by using microwaves to "cook" their diamonds in a hydrogen plasma at 2200 °C but at low pressure. Diamond size is now limited only by the size of the microwave chamber used.

    The most exciting aspect of this new annealing process is the unlimited size of the crystals that can be treated. The breakthrough will allow us to push to kilocarat diamonds of high optical quality," says Hemley's Carnegie Institute colleague Ho-kwang Mao.


    The team's method 'could be routinely run in any laboratory where it is needed,' says Alexandre Zaitsev, a physicist at the City University of New York, whose work also includes diamonds. 'When considered in combination with the high-growth-rate technique of CVD diamonds, it seems to be a starting point of mass-scale production of perfect diamond material at a low price'.
    Zaitsev considers low-pressure annealing at temperatures greater than 2000 °C to be a "breakthrough in diamond research and technology".
    "The improving quality of synthetic diamonds threatens the natural diamond market. While 20 tonnes of natural diamonds are mined annually, some 600 tonnes of synthetic diamonds are produced each year for industrial use alone."

    Home page:
    Carnegie/DOE Alliance Center - CDAC

    Forbidden Planet - Wikiquote.
    "Altaira: Robby, I must have a new dress, right away.
    Robby: Again?
    Altaira: Oh, but this one must be different! Absolutely nothing must show - below, above or through.
    Robby: Radiation-proof?
    Altaira: No, just eye-proof will do.
    Robby: Thick and heavy?
    Altaira: Oh, no, no, it’s got to be the softest, loveliest thing you’ve ever made for me, and fit in all the right places, with lots and lots of star sapphires.
    Robby: Star sapphires take a week to crystallise properly, would diamonds or emeralds do?
    Altaira: Well, if they’re large enough."

  2. #2
    Zainteresovan član
    Reputaciona moć

    Podrazumevano Re: Diamonds are Forever

    Nece, pobice ih Amerikanci... ko sto su one sto su izmislili masinu za pranje vesa na ultrazvuk itd..

Slične teme

  1. After Forever
    Autor Ginger u forumu Muzika
    Odgovora: 1
    Poslednja poruka: 29.10.2008., 12:43
  2. Odgovora: 1
    Poslednja poruka: 29.06.2007., 08:29
    Autor vaske1 u forumu Video igre
    Odgovora: 39
    Poslednja poruka: 03.02.2007., 01:13

Pravila za slanje poruka

  • Ne možete kreirati novu temu
  • Ne možete poslati odgovor
  • Ne možete dodati priloge
  • Ne možete prepraviti svoju poruku