Silicon dioxide | 7631-86-9
Nkọwa ngwaahịa
Ngwakọta kemịkalụ Silicon Dioxide, nke a makwaara dị ka silica (sitere na Latin silex), bụ oxide nke silicon nwere usoro kemịkal SiO2. Amara ya maka isi ike ya kemgbe oge ochie. A na-ahụkarị silica na okike dị ka ájá ma ọ bụ quartz, yana na mgbidi cell nke diatoms.
A na-emepụta silica n'ụdị dị iche iche gụnyere quartz fused, crystal, fumed silica (ma ọ bụ pyrogenic silica), colloidal silica, silica gel, na aerogel.
A na-eji silica eme ihe n'ụzọ bụ isi n'imepụta iko maka windo, iko mmanya, karama ihe ọṅụṅụ na ọtụtụ ihe ndị ọzọ. A na-esikwa na silica mee ọtụtụ eriri anya maka nzikọrịta ozi. Ọ bụ akụrụngwa bụ isi maka ọtụtụ seramiki ọcha dị ka ụrọ, ngwa okwute, poselin, yana ciment Portland.
Silica bụ ihe mgbakwunye a na-ahụkarị na mmepụta ihe oriri, ebe a na-eji ya eme ihe dị ka onye na-asọpụta na nri powdered, ma ọ bụ na-etinye mmiri na ngwa hygroscopic. Ọ bụ akụkụ bụ isi nke ụwa diatomaceous nke nwere ọtụtụ ojiji sitere na nzacha ruo na njikwa ụmụ ahụhụ. Ọ bụkwa akụkụ bụ isi nke ntụ ntụ osikapa bụ nke a na-eji, dịka ọmụmaatụ, nzacha na imepụta ciment.
Ihe nkiri silica dị mkpa nke toro na silicon wafers site na ụzọ oxidation thermal nwere ike ịba uru na microelectronics, ebe ha na-eme ihe dị ka ihe mkpuchi ọkụ eletrik na nkwụsi ike kemịkalụ dị elu. N'ime ngwa eletriki, ọ nwere ike ichekwa silicon, ụgwọ ụlọ ahịa, gbochie ihe dị ugbu a, na ọbụna mee ka ụzọ a na-achịkwa iji gbochie ọsọ dị ugbu a.
A na-eji airgel dabere na silica n'ụgbọelu Stardust iji nakọta ụmụ irighiri ihe ndị ọzọ. A na-ejikwa silica na mmịpụta DNA na RNA n'ihi ike ya iji jikọta acid nucleic n'okpuru ọnụnọ chaotropes. Dị ka silica hydrophobic, a na-eji ya dị ka akụkụ defoamer. N'ụdị hydrated, a na-eji ya na ntacha eze dị ka ihe na-ekpo ọkụ siri ike iji wepụ ihe ncheta eze.
N'ime ikike ya dị ka ihe mgbagha, ọ bara uru n'ụdị eriri dị ka akwa mkpuchi okpomọkụ dị elu. Na ihe ịchọ mma, ọ bara uru maka ihe ndị na-ekesa ọkụ na ntinye eke. A na-eji silica colloidal mee ihe dị ka mmanya na ihe ọṅụṅụ na-emecha ihe ọṅụṅụ. Na ngwaahịa ọgwụ, silica na-enyere ntụ ntụ na-asọba mgbe e mepụtara mbadamba nkume. A na-ejikwa ya dị ka ihe nkwalite okpomọkụ na ụlọ ọrụ mgbapụta ọkụ ọkụ.
Nkọwapụta
Ihe | Ọkọlọtọ |
Ọdịdị | Ọcha ntụ ntụ |
Ịdị ọcha (SiO2,%) | > = 96 |
Ntinye mmanụ (cm3/g) | 2.0-3.0 |
Mfu na ihicha (%) | 4.0-8.0 |
Mfu na mgbanye (%) | = <8.5 |
BET (m2/g) | 170-240 |
pH (ihe ngwọta 10%) | 5.0-8.0 |
Sodium sulfate (dị ka Na2SO4,%) | = <1.0 |
Arsenic (dị ka) | = <3mg/kg |
Ndu (Pb) | = <5 mg/kg |
Cadium (Cd) | = <1 mg/kg |
Mercury (Hg) | = <1 mg/kg |
Mgbakọta ọla dị arọ (dị ka Pb) | = <20 mg/kg |
Ngụkọta ọnụ ọnụ efere | = <500cfu/g |
Salmonella spp / 10 g | Ihe ọjọọ |
Escherichia coli / 5 g | Ihe ọjọọ |