Hielscher faka'ata tekinolosia

Ultrasonic fakamovetevetea ʻo Silica (SiO2)

Silica, ʻoku toe ʻiloa foki ia ko SiO2, nano-silica pe Micro-silica ʻoku fakaʻaongaʻi ia ʻi he nifo, sima, ulapapeni synthetic, ngaue polymer pe ʻi he meʻakai ko ha thickener, adsorbent, fakafofonga ʻo e tuʻi, pe uta koloa ki he ʻalaha mo e flavors. Te ke ako lahi ange ʻi lalo ki hono fakaʻaongaʻi ʻo e nanosilica mo e microsilica pea mo e founga ʻe lava ai ʻe he ngaahi ola sonomechanical ʻo e ultrasonics ʻo fakaleleiʻi ʻa e founga ngaue lelei mo fakaʻosi ʻaki hano ʻai ke lelei ange silica suspensions pe fakaleleiʻi silica nanoparticle synthesis.

Silica fakamovetevete/Silica fakamavaheʻi/Nano Silica (SiO2)

ʻOku lava ke maʻu ʻa e Silica ʻi ha ngaahi foomu hydrophilic mo hydrophobic kehekehe pea ʻoku ʻi ai ha kihiʻi konga siʻi ʻo ha micrometers ʻe niʻihi ki ha nanometers. Ko e angamaheni silica ʻoku ʻikai ke fakamovetevete lelei ia hili ʻa e fakaviviku. ʻOku ne toe tanaki atu foki mo ha microbubbles lahi ki he koloa. Ko e Ultrasonication ko ha founga fakatekinolosia lelei ia ke fakamovetevetea ʻaki ʻa e Micro-silica mo e nano-silica pea toʻo ʻa e kasa mo e bubbles Micro mei he meʻa naʻa ne faʻu.

Ultrasonic fakamovetevetea ʻo ʻita pea Silica: ko e Hielscher ultrasonic homogenizer UP400S disperses silica efu ʻaukai mo lelei ki he kau tautaha, mono-fakamovetevetea, nano-ngaahi momoʻi meʻa.

Ultrasonic fakamovetevete ʻo ʻita pea Silicia ʻi he vai ʻo fakaʻaongaʻi ʻa e UP400S ultrasonic homogenizer

ʻOku fuʻu mahuʻinga ʻaupito ki hono fakaʻaongaʻi ʻo e nano lahi pe lahi ʻo e silica, ha fakamovetevetea lelei mo e faitaha. ʻOku faʻa fie maʻu ha mono silica fakamavaheʻi, hange ko e fua ʻo e size. Kae tautautefito ki hono fakaʻaongaʻi ʻi he inks pe coatings mo e polymers ke fakaleleiʻi ʻaki ʻa e fakafepaki, ʻoku fie maʻu ke siʻisiʻi feʻunga ʻa e ngaahi momoʻi meʻa silica ke ʻoua naʻa kaunoa ʻi he maama ʻoku ʻasi mai ke fakaʻehiʻehi mei he kakapu mo tauhi ʻa e femahinoʻaki. Ko e lahi taha ʻo e ngaahi coatings silica ʻoku fie maʻu ke siʻisiʻi ange ia ʻi he 40nm ke fakahoko ʻa e fie maʻu ko ʻeni. Ki ha ngaahi polokalama kehe, silica kihiʻi konga sigglomeration ʻoku ne fakafeʻatungiaʻi ʻa e kihiʻi konga silica fakafoʻituitui takitaha ke fengaueʻaki mo e mitia takatakai.
ʻOku ola lelei ange ʻa e ultrasonic homogenizers ʻi he dispersing silica ʻi he ngaahi founga kehe ʻoku fio ʻaki e fulufuluʻi moa, hange ko e Lotali mixers pe tangike agitators. ʻOku fakahaaʻi ʻe he fakatata ʻi lalo ha ola angamaheni ʻo ultrasonic dispersing ʻo ʻita pea silica ʻi he vai.

The picture shows a typical result of ultrasonic dispersing of fumed silica in water.

Ultrasonic fakamovetevetea ʻo ʻita pea Silica ʻi he vai

Ko e ngaue ki he lavame'a 'i he ko hono fakasi'isi'i 'i he lahi 'o e Silica

ʻOku maʻolunga ange ʻa ultrasonic fakamovetevetea ʻo nano-silica ki he ngaahi founga ʻoku fio ʻaki e kili, hange ko ha IKA-Turrax. ʻOku fakatupu ʻe ultrasonics suspensions ha kihiʻi konga siʻisiʻi siʻisiʻi mo ultrasonication ko e ivi fakatekinolosia lelei ange ia. Naʻe fakafehoanaki ʻe Pohl mo Schubert ʻa e kihiʻi konga siʻi ʻo e Aerosil 90 (2% Uat) ʻi he vai ʻo fakaʻaongaʻi ha Ultra-Turrax (loa-stator-System) mo ha Hielscher UIP1000hd (1kW ultrasonic device). ʻOku fakahaaʻi ʻe he fakatata ʻi lalo ʻa e ngaahi ola maʻolunga ʻo e founga ultrasonic. Ko e ola ʻo ʻene ako Pohl fakaʻosi, "ʻoku ola lelei ange ʻa e ivi pau ʻi he ivi pau ʻo e fakaʻata ʻi he founga ʻa e lotali-stator." ʻOku mahuʻinga taha ʻa e tuʻunga ʻo e ivi mo e silica kihiʻi konga siʻi ʻi he founga hono ngaohi, ʻa ia ʻoku mahuʻinga taha ai ʻa e totongi ʻo e koloa, founga ngaue mo e tuʻunga lelei ʻo e koloa.

Ultrasonic dispersion of nano-silica compared to other high-shear mixing methods, such as an IKA Ultra-Turrax

Ultrasonics v. Ultra-turrax ki he Silica fakamovetevetea

ʻOku fakahaaʻi ʻe he ngaahi fakatata ʻi lalo ʻa e ngaahi ola naʻe maʻu ʻe Pohl maʻu ʻe sonicating silica e momoko granules. (Lomiʻi ʻi he ngaahi ʻimisi ke fakalahi!)

Silica aafu momoko 'i 'i he 'ao 'o e SonicationNofo movetevete 'a e silica hili e Sonication
(To'ohema: 'i he 'ao 'o e sonication, to'omata'u: hili 'a sonication)

Ke kole ha fakamatala lahi ange!

Kataki 'o faka'aonga'i e foomu 'i lalo, kapau 'oku ke loto ke kole ha fakamatala lahi ange fekau'aki mo hono faka'aonga'i 'o ha 'i he dispersing 'o e silica. Te tau fiefia ke 'oatu ha polokalama ultrasonic fakataha ho'o ngaahi fie ma'u.









Kataki 'o fakatokanga'i ange 'etau Tu'utu'uni totonu fakatautaha.


Ko e ha ʻa Silica (SiO2, Silikoni taiokisaiti)?

Ko e Silica ko ha komipauni kemikale ia ʻoku faʻu ʻaki ʻa e Silikoni mo e ʻokisikena mo e founga ʻo e kemikale SiO2, pe Silikoni taiokisaiti. ʻOku lahi e ngaahi founga kehekehe ʻo e silica, hange ko e fused quartz, ʻita pea silica, silica mota pani ʻaupito, mo e aerogels. ʻOku hoko ʻa Silica ko ha komipauni ʻo ha ngaahi makakoloa mo e koloa synthetic. ʻOku angamaheni ʻaki hono maʻu ʻa e Silica ʻi natula ko quartz pea ʻi ha ngaahi organisms moʻui kehekehe. ʻOku maʻu ʻa e Silikoni taiokisaiti ʻe keli mo hono fakamaʻa ʻo e quartz. Ko e ngaahi tefitoʻi founga ʻe tolu ʻo e amorphous silica ko pyrogenic silica, meʻa--silica mo silica mota pani ʻaupito.

ʻIta pea Silica/Pyrogenic Silica

ʻOku ʻomi ʻe he Silikoni vela tetrachloride (SiCl4) ʻi ha ulo fakapaaki ʻo e e ʻokisikena ha kohu ʻo SiO2 – ʻIta pea silica. Pe, vaporizing quartz ʻoneʻone ʻi ha 3000 °C ʻuhila Arc) ʻuhila, ʻoku ne ʻita pea silica foki. ʻI he ongo founga fakatouʻosi, ko hono ola microscopic droplets ʻo amorphous silica fakatahaʻi ia ki ne fakafehokotaki au, hange ko e ngaahi momoʻi meʻa maʻolunga ʻe tolu. Naʻe agglomerate leva ʻa e ngaahi momoʻi meʻa ko ʻeni hono ua ki ha efu hinehina ʻoku fuʻu maʻulalo ʻaupito density mo e feituʻu maʻolunga ʻaupito. Ko e konga siʻi ʻo e Palaimeli ʻoku ʻikai porous ʻita pea silica ʻoku ʻi he vahaʻa ʻo e 5 a 50 NM. ʻOku maʻu ʻe ʻita pea silica ha ola malohi tatau matolu. Ko ia ai, ʻoku fakaʻaongaʻi ʻa e ʻita pea silica ko filler ʻi he elastomer mo viscosity liliu ʻi vali, coatings, adhesives, paaki inks pe ko e Poliesita resins. ʻE lava ke ngaohi ʻa ʻita pea Silica ke hoko ia hydrophobic pe hydrophilic ki ha ngaahi founga huhuʻa pe aqueous. Ko hydrophobic silica ko ha konga defoamer lelei ia (fakafofonga ʻo e kau ʻAnitai-fanganga).
Lomiʻi heni, ke lau fekauʻaki mo ultrasonic degassing mo defoaming.
ʻIta pea Silica CAS fika 112945-52-5

Silica Fuau/Microsilica

Silica fuau ko ha ultra lelei, nano efu lahi ʻoku toe ʻiloa ko e Micro-silica. ʻOku ʻikai totonu ke fetoʻoaki ʻa Silica fuʻita pea silica. ʻOku kehekehe pe ʻa e founga hono ngaohi, morphology mo e ngaahi konga ʻo hono fakaʻaongaʻi ʻo e silica fuau mei he niʻihi ʻo ʻita pea silica. Silica fuau ko ha amorphous, ʻikai crystalline, polymorph fotunga ʻo SiO2. ʻOku kau ʻi Silica fuau ʻa e ngaahi momoʻi meʻa spherical ʻaki ha ʻavalisi ʻo e inisi honau matolu ʻo e 150 NM. Ko e founga mahuʻinga taha ki hono fakaʻaongaʻi ʻo e silica fuu ko pozzolanic naunau ia ki he sima ki he ngaue maʻolunga. ʻOku tanaki atu ia ki he sima sima ki Potileni ke fakaleleiʻi ʻaki e ngaahi koloa sima, hange ko lahi malohi, haʻi e malohi, mo e fakafepaki abrasion. Kae ope atu ai, silica ʻoku fakasiʻisiʻi ʻe he fuau ʻa e permeability ʻo e sima ki chloride ions. ʻOku maluʻi heni ʻa e ukamea ʻoku ne fakamalohia ʻa e sima mei he corrosion.
Ke ʻilo lahi ange fekauʻaki mo ultrasonic fefiofi ʻo e sima mo e silica fuau, kataki ʻo lomiʻi heni!
Silica Fuau CAS number: 69012-64-2, Silica Fuau EINECS number: 273-761-1

Meʻa--Silica

Meʻa--silica hinehina powdery synthetic amorphous ʻo SiO2. ʻOku fakaʻaongaʻi ʻa e meʻa--silica ko ha filler, fakamolu pe fakalakalaka ʻo e ngaue ʻi he pelesitiki pe ulapapeni, hange ko e vaʻe. ʻOku kau ʻi he ngaahi fakaʻaongaʻi kehe ʻa e fakamaʻa, fulunifa pe fakafofonga fakaleleiʻi ʻi he nifo.
Ke ʻilo lahi ange fekauʻaki mo e ultrasonic ʻoku fio ʻi he ngaohiʻanga nifo, kataki ʻo lomiʻi ʻi heni!
ʻOku maʻu ʻe he ngaahi momoʻi meʻa ʻita pea silica ha inisi honau matolu ʻi he vahaʻa ʻo e 5 mo e 100 NM, lolotonga ia ʻoku agglomerate ʻa e lahi ʻo e size ki he 40 μm pea ʻavalisi ʻo e size ʻoku lahi hake ʻi he 30 NM. Hange ko pyrogenic silica, meʻa--silica ʻoku ʻikai microporous.
ʻOku faʻu ʻa ʻita pea Silica ʻe precipitation mei ha founga ʻoku ʻi ai ha ngaahi salts. Hili ha tali ʻa ha taha ʻoku ʻikai ke ʻi ai ha ʻesiti ko, sulfuric ʻoku tanaki atu leva ʻa e ʻesiti mo e ngaahi founga ʻelemeniti ko ʻi hono ueʻi holo, hange ko ultrasonic hono ueʻi holo, ki he vai. Silica precipitates ʻi he ngaahi tukunga ʻo e ʻesiti. Makehe mei he ngaahi moʻoniʻi meʻa, hange ko e loloa ʻo e precipitation, ko e tanaki atu ʻo e reactants, mafana mo e tokanga, mo e pH, ʻe lava ke kehekehe ʻa e founga mo e malohi ʻo hono ueʻi holo ʻo e ngaahi koloa ʻo e silica. Ko hono ueʻi ko ia ʻo e Sonomechanical ʻi ha ultrasonic Seinopolo loki ʻi ʻolunga ko ha founga lelei ia ke maʻu ai ha kihiʻi konga siʻi mo e faitaha. ʻOku ultrasonic hono ueʻi holo ʻo e mafana ʻo e ʻea ʻi hono faʻu ʻo ha mota pani ʻaupito siteisi.
Ke maʻu ha fakamatala lahi ange fekauʻaki mo ultrasonically tokoni precipitation ʻo nanomaterials, hange ko meʻa--silica, kataki ʻo lomiʻi heni!
Meʻa--Silica CAS fika: 7631-86-9

Colloidal Silica/Silica Colloid

Ko Colloidal silica ko hano taʻofi ia ʻo ha nonporous lelei, amorphous, ko e lahi taha spherical silica ngaahi momoʻi meʻa ʻi ha konga huhuʻa.
Ko e ngaahi fakaʻaongaʻi angamaheni taha ʻo e silica colloids ko e tokoni ki he fakatafe ʻi papermaking, abrasive ki Silikoni wafer fakaleleiʻi, fakalotolahi ʻi he founga ʻo e kemikale, hauhau e hauhau, additive ke abrasion tekeʻi ʻa e coatings, pe surfactant ki flocculating, coagulating, dispersing pe fakatuʻumaʻu.
Ke ʻilo lahi ange fekauʻaki mo colloidal silica ʻi abrasion tekeʻi polymer coatings, kataki ʻo lomiʻi heni!

Ko hono fokotuʻu ko ia ʻo colloidal silica ko ha founga ia ʻoku fakahoko ʻi he sitepu. ʻOku fakaiku ʻa e neutralization fakakonga pe ʻo ha founga alkali ki hono faʻu ʻo silica nuclei. Ko e ngaahi ʻimisi subunits ʻo colloidal silica ʻoku meimei ke ʻi he vahaʻa ʻo e 1 mo e 5 NM. ʻE lava ke fakatahaʻi ʻa e ngaahi ʻniti ko ʻeni, ʻo makatuʻunga ʻi he ngaahi tuʻunga ʻo e polymerization. ʻI hono fakasiʻisiʻi e pH ʻi lalo he 7 pe tanaki atu ki he masima ʻoku fakahehema e ngaahi ʻiuniti ke fakatahaʻi fakataha ʻi he ngaahi seini, ʻa ia ʻoku faʻa ui ko e silica gels. ʻIkai ngata ai, ʻe kei mavahevahe pe ʻa e ngaahi ʻniti fakaikiki pea tupulaki mamalie. ʻOku faʻa ui ʻa e ngaahi koloa silica sols pe meʻa--silica. ʻOku fakatolonga ha colloidal silica fakamavaheʻi ʻe he pH fakatonutonu pea toki fakatefito, hange ko e ʻea.
Ke ʻilo lahi ange fekauʻaki mo sonomechanical ngaahi ola ʻi he founga solo mota pani ʻaupito, kataki ʻo lomiʻi heni!

Silica tuʻunga fakatuʻutamaki ʻo e moʻui lelei

Ko e crystalline momoa pe ko e taiokisaiti ko e maʻamaʻa ʻo e tangata carcinogen te ne lava ʻo fakatupu ha mahaki ʻo e maʻamaʻa, kanisa ʻo e maʻamaʻa pe ngaahi mahaki autoimmune. ʻI he taimi ʻoku silica ai ʻa e efu pea hu ki he maʻamaʻa ʻoku ne fakatupu hono faʻu ʻo ha patepate pea fakasiʻisiʻi ʻa e malava ko ia ke toʻo ʻa e maʻamaʻa ʻi he ʻosikena (Silicosis). Ko hono fakaviviku mo fakamovetevetea ʻo SiO2 ki ha konga huhuʻa, hange ko e ultrasonic homogenization, ʻoku ne toʻo atu ʻa e fakatuʻutamaki ʻo e inhalation. Ko ia ʻoku fuʻu maʻulalo ʻaupito ʻa e fakatuʻutamaki ʻo ha koloa huhuʻa ʻoku ʻi ai SiO2 ke fakatupu Silicosis. Kataki ʻo fakaʻaongaʻi ha meʻangaue maluʻi fakatautaha feʻunga ʻi he taimi ʻoku ke ngaue ʻaki ai ʻa e silica ʻi he foomu efu momoa!

Ngaahi tohi

  • Markus Pohl, Helmar Schubert (2004): Dispersion and deagglomeration of nanoparticles in aqueous solutions, 2004 Partec

Silica aafu momoko 'i 'i he 'ao 'o e Sonication
silica 'i he 'ao 'o e sonication

Nofo movetevete 'a e silica hili e Sonication
silica hili e sonication

Kole 'a e fakamatala




Fakatokanga'i ange 'etau Tu'utu'uni totonu fakatautaha.