Priče o elementima #21: titanij – metal koji se sk

TiO2 se koristi i za vacuum coating optike jer je osobito tvrd, za mehaničku zaštitu ali i za optička svojstva...npr plastične leće naočala su coatirane sa titan dioksidom da se ne bi lako zagreble (to obično posebno naplaćuju) ali je prilično komplicirana tehnologija: Vapor Deposition ili Magnetron Sputtering...tvornica Zrak sarajevo je u 80 godinama vrlo napredno počela takvo coatiranje valjda za vojnu optiku

me interesira jel moguće da postoje kemijski elementi i spojevi za koje ne znamo...kao u SF filmovima di imaju "čarobna" svojstva...i dali se svi kemijski elementi mogu međusobno kombinirati...recimo Ti+Au

Sirugno ima kemijskih spojeva za koje ne znamo, jer su mogućnosti kemijskih kombinacija praktički neograničene. S elementima je druga priča. Kemijski element je određen brojem protona u jezgri, pa po tom broju nalazi svoje mjesto u periodnom sustavu. Postoje mnogi elementi većeg rednog broja (protonskog broja) od uranoijeve (transurani, aktinici) no njihova je atomska jezgra tako nestabilna da se raspadne prije nego što se uspije izgraditi elektronski omotač oko nje. Stoga možemo reći da ne poznajemo te atome, nego samo njihove jezgre. Dakle, ništa od nekakvih novih elemenata koje vidimo u SF filmovima. 

 Meni je najbolji unobtanium - James Cameronov humor na svoj račun u njegovim blesavim Avatar filmovima.

 
Sjećam se jedne epizode iz mislim odlične davne dokumentarne serije "Dosegnuti nebo" prikazivane na našoj dalekovidnici, u kojoj je prikazano kako SR71 u hangaru curi gorivo poput stare izbušene kante jer čitava konstrukcija treba imati gapove koji se zbog toplinskog širenja materijala zatvaraju tek pri velikim nadzvučnim brzinama/trenjem sa zrakom ... premda mi se razlika od čak pola metra čini kao malo pretjeran podatak.

Čini mi se da se u slučaju opskrbe gorivom američkih nuklearnih reaktora ipak radilo o međudržavnom sporazumu sa SSSRom/Rusijom, kao dio Gorbačovljeve ili ipak post sovjetske politike detanta iliti dogovorenog razoružanja & popuštanja napetosti u naporima za izbjegavanje sveopćeg nuklearnog uništenja - koncept koji je na žalost totalno nepoznat ovim krebilima sada na vlasti na Zapadu.

 
Ah, malo sam proguglao, najvjerojatnije se radilo o ovome:

Project Sapphire was a successful 1994 covert operation of the United States government in cooperation with the Kazakhstan government to reduce the threat of nuclear proliferation by removing nuclear material from Kazakhstan as part of the Cooperative Threat Reduction Program, which was authorized by the Soviet Nuclear Threat Reduction Act of 1991.

A warehouse at the Ulba Metallurgical Plant outside Ust-Kamenogorsk housed 1,322 pounds (600 kg) of weapons grade enriched uranium to fuel Alfa class submarines (90% U-235). Following the dissolution of the Soviet Union, the fuel was poorly documented and secured, and in danger of being sold for use in the construction of nuclear weapons. This mission stands as a successful attempt of a country secretly moving into another country to protect them from the dangers of nuclear weapons left behind by the Soviet Union.

...
After months of preparation, 31 agents forming the specialised Nuclear Emergency Recovery Team were recruited in October 1994 to embark on a covert mission to remove the uranium. On October 7, President Bill Clinton signed a classified directive to approve the airlift - composed of 3 C-5 aircraft - to leave from Delaware's Dover Air Force Base to Kazakhstan. The team spent 12 hours a day from October 14 to November 11 packing up uranium (including seven different types of uranium, some laced with toxic beryllium) in extreme secrecy. The team found 1032 containers in the warehouse and repacked the material into 448 shipping containers.
https://en.wikipedia.org/wiki/Project_Sapphire



A ja sam mislio na ovo:

The Megatons to Megawatts Program, also called the United States-Russia Highly Enriched Uranium Purchase Agreement, was an agreement between Russia and the United States whereby Russia converted 500 metric tons of "excess" weapons-grade uranium (enough for 20,000 warheads) into 15,000 metric tons of low enriched uranium, which was purchased by the US for use in its commercial nuclear power plants. The official name of the program is the "Agreement between the Government of the Russian Federation and the Government of the United States of America Concerning the Disposition of Highly-Enriched Uranium Extracted from Nuclear Weapons", dated February 18, 1993. Under this Agreement, Russia agreed to supply the United States with low-enriched uranium (LEU) obtained from high-enriched uranium (HEU) found to be in excess of Russian defense purposes. The United States agreed to purchase the low-enriched uranium fuel.
...
The program was credited for being one of the most successful disarmament programs in history, but its low set price for nuclear fuel caused Western companies to not invest in uranium refining capacity, resulting by 2022 in Russia's government-owned Rosatom becoming the supplier of about 50% of the world's enriched uranium, and 25% of the nuclear fuel used in the US*.
https://en.wikipedia.org/wiki/Megatons_to_Megawatts_Program

*mala digresija: znači može rusko nuklearno gorivo za američke nuklearke - ali ne može ruski plin i nafta za europske termoelektrane... kako pošteno, obzirno i dosljedno od naših saveznika Amera, Heinz Alfred Kissinger se u grobu smije 

EU je bila dala nekakvu zabranu za korištenjem TiO2 u prehrambenoj industriji. U tabletama ga isto ima. Iskreno ne znam koja bi bila bolja alternativa kao bijelo bojilo.