I-Silicon Dioxide | 7631-86-9
IiNkcazo zeeMveliso
I-chemical compound i-Silicon Dioxide, eyaziwa ngokuba yi-silica (ukusuka kwi-Latin silex), yi-oxide ye-silicon ene-chemical formula SiO2. Iyaziwa ngokuba lukhuni kwayo ukususela kumaxesha amandulo. I-silica ixhaphake kakhulu kwindalo njengesanti okanye i-quartz, kunye nakwiindonga zeeseli ze-diatoms.
I-silica yenziwe ngeendlela ezininzi ezibandakanya i-quartz edibeneyo, i-crystal, i-silica evuthayo (okanye i-pyrogenic silica), i-colloidal silica, i-silica gel, kunye ne-aerogel.
I-silica isetyenziswa ikakhulu kwimveliso yeglasi yeefestile, iiglasi zokusela, iibhotile zesiselo, kunye nezinye izinto ezininzi ezisetyenziswayo. Uninzi lweefiber ezibonakalayo zonxibelelwano lwenziwe nge-silica. Yimathiriyeli ekrwada yokuqala yeeseramikhi ezininzi ze-whiteware ezifana nodongwe, ilitye, i-porcelain, kunye nesamente yasePortland yoshishino.
I-silica yongezelela eqhelekileyo kwimveliso yokutya, apho isetyenziswe ngokuyinhloko njenge-ejenti yokuhamba kwi-powdered foods, okanye ukufunxa amanzi kwizicelo ze-hygroscopic. Licandelo eliphambili le-diatomaceous earth enosetyenziso oluninzi ukusuka ekuhluzweni ukuya kulawulo lwezinambuzane. Ikwayinxalenye ephambili yothuthu lwerayisi olusetyenziswayo, umzekelo, ekuhluzeni nasekuveliseni isamente.
Iifilimu ezicekethekileyo ze-silica ezikhule kwii-silicon wafers ngeendlela ze-thermal oxidation zinokuba luncedo kakhulu kwi-microelectronics, apho zisebenza njengezithinteli zombane ezinozinzo oluphezulu lwekhemikhali. Kwizicelo zombane, inokukhusela i-silicon, intlawulo yokugcina, ibhloko yangoku, kwaye isebenze njengendlela elawulwayo yokunciphisa ukuhamba kwangoku.
I-airgel esekwe kwisilica yasetyenziswa kwisiphekepheke seStardust ukuqokelela amasuntswana angaphandle komhlaba. I-silica iphinda isetyenziswe kwi-extraction ye-DNA kunye ne-RNA ngenxa yokukwazi ukubopha kwi-nucleic acids phantsi kobukho be-chaotropes. Njenge-silica ye-hydrophobic isetyenziswe njengenxalenye ye-defoamer. Kwifom ye-hydrated, isetyenziswe kwi-toothpaste njenge-abrasive enzima ukususa i-plaque yezinyo.
Kwisikhundla sayo njenge-refractory, iluncedo kwifom yefiber njengendwangu yokukhusela i-thermal ephezulu. Kwizinto zokuthambisa, luncedo kwiimpawu zayo zokukhanya kunye ne-absorbency yendalo. I-Colloidal silica isetyenziswa njenge arhente yokucoca iwayini kunye nejusi. Kwiimveliso zamachiza, i-silica inceda ukuhamba komgubo xa iipilisi zenziwe. Ikwasetyenziswa njengekhompawundi yokwandisa ubushushu kumzi-mveliso wempompo yobushushu bomhlaba.
Inkcazo
| Into | UMGANGATHO |
| Imbonakalo | Umgubo omhlophe |
| Ucoceko (SiO2, %) | >= 96 |
| Ukufunxwa kwe-oyile (cm3/g) | 2.0~ 3.0 |
| Ilahleko ekomisweni (%) | 4.0~ 8.0 |
| Ilahleko ekutshisweni (%) | =<8.5 |
| BET (m2/g) | 170 ~ 240 |
| pH (10% isisombululo) | 5.0~ 8.0 |
| I-sodium sulfate (njenge-Na2SO4,%) | =<1.0 |
| IArsenic (Nje) | =< 3mg/kg |
| Khokela (Pb) | =< 5 mg / kg |
| Ikhadiyamu (Cd) | =< 1 mg/kg |
| IMercury (Hg) | =< 1 mg/kg |
| Iintsimbi ezinzima zizonke (njengePb) | =< 20 mg / kg |
| Ubalo lweepleyiti lulonke | =<500cfu/g |
| Salmonella spp./ 10g | Ibi |
| Escherichia coli/5g | Ibi |
