Qhov sib txawv tseem ceeb ntawm colloidal silica thiab reactive silica yog tias colloidal silica yog cov polymeric daim ntawv ntawm silicon, whereas reactive silica yog cov non-polymeric daim ntawv ntawm silicon.
Silica lossis silicon dioxide yog crystalline compound uas muaj nyob rau hauv feem ntau pob zeb, ntxhia, thiab xuab zeb. Cov tshuaj no tsim thaum silicon thiab oxygen react nrog ib leeg thiab lwm yam hlau los yog ntxhia. Feem ntau, silica hauv dej muaj nyob rau hauv ob hom: reactive silica thiab colloidal silica.
Colloidal Silica yog dab tsi?
Colloidal silica yog ib qho kev ncua ntawm silica hais nyob rau hauv cov kua theem. Cov qauv silica hauv qhov kev ncua no tuaj yeem piav qhia tias yog amorphous, nonporous, thiab feem ntau spherical silica hais. Thaum silica hais nyob rau hauv dej, qhov chaw ntawm colloidal silica nyob rau hauv kev sib cuag nrog dej yog them los ntawm siloxane bonds thiab silanol pawg. Yog li ntawd, peb tuaj yeem piav qhia txog colloidal silica li cov tshuaj hydrophilic uas muaj peev xwm tsim cov ntawv cog lus hydrogen.
Daim duab 01: Silica Particle Deg hauv dej
Peb tuaj yeem npaj colloidal silica ntawm ntau cov txheej txheem uas cov tshuaj alkali silicate yog ib nrab neutralized, ua rau tsim cov silica nuclei. Feem ntau, silica particle subunits yog nyob rau hauv qhov loj ntawm 1 txog 5 nm. Kev sib xyaw ntawm cov subunits no nyob ntawm cov xwm txheej ntawm polymerization uas muaj nyob rau hauv lub ncua kev kawm ntawv colloidal. Txawm li cas los xij, qhov pib acidification ntawm dej iav kua (sodium silicate tov) yields silicon hydroxide, Si (OH) 4.
Yog tias peb ntxiv ntsev rau hauv cov tshuaj tua kab mob colloidal silica (lossis yog tias pH txo qis dua 7), cov silica hais hauv qhov raug ncua yuav sib txuas nrog ib leeg, tsim cov saw hlau. Cov khoom no hu ua silica gel. Txawm li cas los xij, yog tias peb khaws cov pH me ntsis ntawm sab alkaline (saum toj no pH=7), ces cov silica particles tseem sib cais thiab zoo li maj mam loj hlob. Peb tuaj yeem hu rau hom silica no ua silica precipitated lossis silica sols.
Muaj ntau yam kev siv ntawm colloidal silica, suav nrog papermaking qhov twg nws yog siv los ua cov kua dej, hauv nanomedicine ntau lawm, tsim cov kub kub binders, peev casting, carbonless ntawv, nyob rau hauv catalysis, raws li ib tug noo noo absorbent, etc.
Reactive Silica yog dab tsi?
Reactive silica yog ib qho monomeric silica, suav nrog cov ntawv ionized thiab muaj peev xwm ua kom muaj cov dimer ntawm silicon. Nyob rau hauv lwm yam lus, reactive silica yog cov non-polymeric daim ntawv ntawm silica. Muaj ntau txoj hauv kev uas peb tuaj yeem siv los tshem tawm cov silica reactive los ntawm cov dej. Cov txheej txheem no muaj xws li txiv qaub softening, ion pauv, rov qab osmosis, ultrafiltration, thiab electrocoagulation.
Daim duab 02: Lub Tank Muab Dej
Txawm li cas los xij, txoj hauv kev zoo tshaj plaws los tshem tawm cov silica reactive ntawm dej yog thim rov qab osmosis vim tias txoj kev no suav nrog oxidation ntawm hlau, sulfur, thiab manganese, tshem tawm cov tshuaj chlorine, thiab chloramine, thiab lwm yam. Txoj hauv kev zoo tshaj los tshem tawm nws yog ultrafiltration.
Qhov txawv ntawm Colloidal Silica thiab Reactive Silica yog dab tsi?
Colloidal thiab reactive silica yog ob hom silicon tam sim no hauv dej. Qhov sib txawv tseem ceeb ntawm colloidal silica thiab reactive silica yog tias colloidal silica yog cov polymeric daim ntawv ntawm silicon, whereas reactive silica yog cov non-polymeric daim ntawv ntawm silicon. Nyob rau hauv lwm yam lus, colloidal silica yog heev tsis-reactive, thaum reactive silica yog heev reactive thiab nyiam mus rau polymerization thiab lwm yam tshuaj.
Hauv qab infographic nthuav tawm cov ntsiab lus ntawm qhov sib txawv ntawm colloidal silica thiab reactive silica hauv daim ntawv tabular.
Summary – Colloidal Silica vs Reactive Silica
Colloidal thiab reactive silica yog ob hom silicon tam sim no hauv dej. Qhov sib txawv tseem ceeb ntawm colloidal silica thiab reactive silica yog tias colloidal silica yog cov polymeric daim ntawv ntawm silicon, whereas reactive silica yog cov non-polymeric daim ntawv ntawm silicon.
