Aluminium fuushan (Aluminium Oxid): Nanoscale Architecture and Multifunctional Applications of a High-Surface- Area Ceramic Material gamma alumina budada

1. Synthesis, Qaab dhismeedka, iyo Astaamaha Muhiimka ah ee Aluminium Fumed

1.1 Farsamaynta Wax-soo-saarka iyo Samaynta Wajiga Aerosol-ka

(Aluminium fuushan)

Aluminium qiiq ah, sidoo kale loo yaqaan alumina pyrogenic, waa daahir-sare, qaabka nanostructured ee miisaanka fudud ee aluminium oksaydh (Al ₂ O LIX) lagu abuuray hab kul-kulul sare leh oo uumiga-waji-abuurka.

Si ka duwan aluminiinta caadiga ah ee la kariyey ama la soo dajiyay, alumina qiiqa waxaa lagu abuuray reactor ololka halkaas oo horudhacyo ka kooban aluminium– sida caadiga ah koloriin aluminium khafiifa (AlCl afar) ama walxaha organoaluminium– waxay ku shidaan ololka hydrogen-oxygen marka heerkulku sii socdo 1500 ° C.

Jawigan daran, horudhacuhu wuu isbedelaa oo maraa hydrolysis ama oksaydhation si uu u sameeyo uumi aluminium ah oo fudud, kaas oo si degdeg ah u nuugeeya isla markiiba nanoparticles muhiimka ah marka uu gaasku qaboojiyo.

Qaybahan bilawga ahi way isku dhacaan oo isku daraan heerka gaaska, samaynta isku-ururin silsilad u eg oo midba midka kale ku hayo curaarta covalent adag, taasoo keenta dalool aad u sarreeya, qaab-dhismeedka shabakada saddex-geesoodka ah.

Nidaamka oo dhan wuxuu ku dhacaa arrin millise seconds, soo saarista rigoore, budo raaxo leh oo nadiif ah oo gaar ah (inta badan > 99.8% Al ₂ O SHAN) iyo wasakhowga ionic-ka, taas oo ka dhigaysa mid ku habboon codsiyada warshadaha iyo elektiroonigga ah ee waxqabadka sare leh.

Badeecada ka dhalata waxaa lagu soo ururiyaa iyadoo la nadiifinayo, guud ahaan isticmaalka birta sintered ama filtarrada dhoobada, oo intaas ka dib la deagglomered ilaa heerar kala duwan iyadoo ku xiran codsiga loogu talagalay.

1.2 Nanoscale Morphology iyo Chemistry Area Dusha sare

Sifooyinka qeexida alumina qiiqa waxay ku xiran yihiin qaabka nanoscale iyo dusha sare ee gaarka ah, kaas oo inta badan ka duwan 50 ku 400 m²/ g, iyadoo ku xiran xaaladaha wax soo saarka.

Cabbirrada jajabka aasaasiga ah ayaa badanaa u dhexeeya 5 iyo 50 nanometer, oo ay ugu wacan tahay habka ololka-soo-saarka, Qaybahani waa kuwo aan toos ahayn ama waxay muujinayaan marxalad aluminium ah oo ku-meel-gaar ah (sida γ- ama δ-Al ₂ O LABA), lid ku ah α-alumina heerkulbeeg ahaan sugan (korundum) waji.

Qaab-dhismeedkan dheef-shiid kiimikaadka ah wuxuu wax ka taraa fal-celinta aagga sare ee weyn iyo hawsha isku-dhafka ah ee ka duwan qaababka alumina ee crystalline..

Meesha sare ee aluminiumka qiiqa ah ayaa ku badan hydroxyl (-OH) kooxaha, kaas oo ka yimaada ficilka hydrolysis inta lagu jiro isku-dhafka iyo soo-gaadhista ka dib ee qoyaanka deegaanka.

Meelahan dusha sare ee hydroxyls waxay ka ciyaaraan waajibaad muhiim ah dejinta kala-baxa alaabta, dareen, iyo la falgalka maaddooyinka organic iyo inorganic.

( Aluminium fuushan)

Ku tiirsanaanta daaweynta dusha sare, alumina qiiqa leh waxay noqon kartaa hydrophilic ama lagu bixiyo hydrophobic iyada oo loo marayo silanization ama isbeddello kiimiko oo kala duwan, awood u yeelashada ku haboon ee polymers, xabagta, iyo dareerayaasha.

Tamarta aagga sare ee sare iyo porosity ayaa sidoo kale ka dhigaya alumina qiiqa ah rajo heer sare ah oo xayeysiis ah, catalysis, iyo hagaajinta rheology.

2. Doorarka shaqeynaya ee Xakamaynta Rheology iyo Dejinta Faafinta

2.1 Ficilada Thixotropic iyo Nidaamyada Dejinta Ka-hortagga

Mid ka mid ah codsiyada farsamo ahaan ugu muhiimsan ee alumina qiiqa ayaa ah awoodda ay u leedahay inay wax ka beddesho guryaha rheological ee nidaamyada dareeraha., gaar ahaan dhamaadka, xabagta, khad, iyo walxo isku dhafan.

Marka lagu kala firdhiyo rarka la dhimay (guud ahaan 0.5– 5 wt%), alumina qiiqa ah waxay samaysaa shabakad qulqulaya iyada oo loo marayo isku xidhka hydrogen iyo isdhexgalka van der Waals ee ka dhexeeya ururadeeda, gudbinta qaab-dhismeedka jel-u-ekaanta oo kale cabitaannada aan viscosity-koodu hooseeyo.

Shabakaddani waxay ku jabtaa walaaca xiirta (tusaale., inta lagu jiro cadayashada, buufin, ama isku dhafka) oo dib u habeyn lagu sameeyo marka xiisadda meesha laga saaro, caadooyinka loo yaqaan thixotropy.

Thixotropy waxay lagama maarmaan u tahay ka-hortagga hoos u dhaca dhammaystirka qumman, joojinaya dejinta midabka rinjiga, iyo ilaalinta isku-noolaanshaha qaab-dhismeedka qaybo badan oo ka kooban dhammaan goobta kaydinta.

Si ka duwan dhumucyada cabbirkoodu yar yahay, alumina qiiqa leh waxay ku guulaysataa saamayntan iyada oo aan si aad ah loo kordhinayn viscosity-ka guud ee gobolka shaqada, ilaalinta karti-shaqsiyeedka iyo dhamaystirka tayada sare.

Intaa waxaa dheer, Dabeecadda dabiiciga ah ee aan dabiiciga ahayn waxay dammaanad qaadaysaa xasilloonida muddada-dheer iyo burburinta microbial-ka iyo kuleylka kuleylka, ka soo baxaysa dhumucyo badan oo organic ah oo ku jira goobo aad u daran.

2.2 Farsamooyinka Kala-firdhinta iyo Wanaajinta Waafaqid

Helitaanka kala firdhisanaanta joogtada ah ee alumina qiiqa ayaa muhiim u ah kor u qaadida waxqabadkeeda shaqaynteeda iyo ka fogaanshaha cilladaha xad dhaafka ah.

Sababo la xiriira korkiisa sare iyo cadaadis adag interparticle, alumina qiiqa badanaa waxay u egtahay inay sameeyaan agglomerates adag kuwaas oo ay adagtahay in la dhaawaco iyadoo la isticmaalayo isku-dhafka dhaqameed.

Isku darka xiirid sare, ultrasonication, ama shiididda saddexda duub ayaa caadi ahaan loo shaqeeyaa si loo dhimo budada oo loogu dhex daro matrixka martida loo yahay..

Dusha la daweeyay (biyo-cabbid) Tayada waxay tusinaysaa la jaanqaadka warbaahinta aan dabaylaha ahayn sida resins epoxy, polyurethane, iyo saliidaha silikoon, hoos u dhigida awooda loo baahan yahay faafinta.

Nidaamyada ku salaysan dareeraha, xulashada polarity dareeraha waa in lagu beegaa kiimiko dusha sare ee aluminiumka si loo sameeyo qoynta iyo amniga qaarkood.

Kala firdhinta saxda ah kaliya ma kordhiso xakamaynta rheological laakiin sidoo kale waxay kordhisaa taageerada farsamada, nadiifinta indhaha, iyo ilaalinta kulaylka ee xarunta ugu dambeysa.

3. Taageerada iyo Kobcinta Waxqabadka ee Alaabooyinka Isku-dhafka ah

3.1 Kobcinta Makaanikada iyo Dhismayaasha Kulul

Fumed alumina waxay u adeegtaa sidii wax-qabad badan oo lagu daro polymer iyo xeryahooda dhoobada, ka qayb qaadashada xoojinta farsamada, xasilloonida kulaylka, iyo guryaha xayndaabka.

Marka si fiican loo kala firdhiyey, nano-xajmiga nano iyo qaab-dhismeedka shabakadooda ayaa xaddidaya dhaqdhaqaaqa silsiladda polymer, kor u qaadida modules-ka, adkaansho, iyo iska caabin gurracan ee matrixka.

In nidaamka epoxy iyo silicone, alumina qiiqa waxay hagaajisaa dhaqdhaqaaqa kulaylka wax yar iyada oo si weyn u wanaajinaysa amniga cabbirka ee baaskiilka kulaylka.

Meesheeda dhalaalaysa ee sare iyo firfircoonaan la'aanta kiimikaad waxay awood u siinaysaa isku-dhafan inay ilaashadaan daacadnimada heerarka heerkulka sare, iyaga oo ka dhigaya kuwo ku habboon koofiyadaha dhijitaalka ah, qaybaha hawada, iyo gaasaska heerkulka sare leh.

Intaa waxaa dheer, Shabakadda qaro weyn ee ay samaysay aluminium qiiqa ah waxay u dhaqmi kartaa sidii caqabad faafin ah, hoos u dhac ku yimaada qaabka gaasaska iyo qoyaanka– faa'iido u leh daboolka badbaadada iyo alaabta baakadaha.

3.2 Dahaarka Korontada iyo Waxqabadka Korontada

Iyadoo aan loo eegin qaab-dhismeedkeeda nanostructured, alumina qiiqa leh waxay ilaalisaa guryaha ilaalinta korantada ee aadka u wanaagsan gaar ahaan aluminium oksaydh oo khafiif ah.

Iyada oo mugga iska caabin ah uu dhaafo 10 ¹² Ω · cm iyo xooga koronto oo dhowr kV/mm ah, waxaa si weyn loo isticmaalaa in alaabta dahaarka sare-voltage ah, oo ay ku jiraan joojinta telefishinka fiilada, qalabka beddelka, iyo looxa wareegga daabacan (PCB) laminates.

Marka si sax ah loogu daro caag silikoon ama walxaha epoxy, alumina qiiqa kaliya ma xoojiso walxaha, laakiin waxay sidoo kale caawisaa kala daadinta diirimaadka waxayna hoos u dhigtaa dheecaannada qayb ahaan, kor u qaadida cimri dhererka hababka dahaarka korontada.

In nanodielectrics, Isku xirka u dhexeeya qaybaha aluminium ee qiiqa leh iyo matrix polymer-ka ayaa door muhiim ah ka ciyaara dabinka bixiyeyaasha kharashka iyo beddelka wareegga wareegga korontada, keena caabbinta guuldarada oo la xoojiyey oo la yareeyey khasaaraha korantada.

Injineernimada wajigan ayaa ah diiradda ugu muhiimsan horumarinta alaabada dahaarka jiilka soo socda ee korontada iyo nidaamyada tamarta la cusboonaysiin karo..

4. Codsiyada Sare ee Catalysis, shaandhaynta, iyo Tignoolajiyada Soo Kordhaysa

4.1 Taageerada Catalytic iyo Dareenka Aagga Dusha sare

Oogada sare iyo aagga dusha sare ee hydroxyl dhumucda alumina qiiqa ayaa ka dhigaya wax soo saar wax ku ool ah oo loogu talagalay kicinta kala duwan..

Waxaa loo isticmaalaa in lagu kala firdhiyo noocyada birta firfircoon sida platinum, palladium, ama nikkel ee falcelinta ku lug leh hydrogenation, fuuqbaxa, iyo dib u habaynta hydrocarbon.

Marxaladaha alumina ee ku-meel-gaadhka ah ee aluminiumka qiiqa ah ayaa bixiya dheellitirka heerka dusha sare ee aysidhka iyo xasilloonida kulaylka., ka caawinta isdhexgalka adag ee taageerada birta ah ee ka fogaanaya xinjirowga oo kor u qaadaya dhaqdhaqaaqa kicinta.

In catalysis deegaanka, Nidaamyada aluminium-ku-saleysan ee qiiqa leh ayaa loo adeegsadaa ciribtirka xeryahooda baaruudda ee gaaska (hydrodesulfurization) iyo kala daadsanaanta walxaha dabiiciga ah ee aan degganayn (VOCs).

Awoodeeda ay ku adsorbayso oo ay dhaqaajiso molecules-ka nanoscale interface interface waxay u dhigantaa rajo soo jiidasho leh ee kimistariga cagaaran iyo injineernimada nidaamka waara.

4.2 Kordhinta Saxda ah iyo Dhamaystirka Aagga Dusha Sare

Aluminium qiiq ah, gaar ahaan noocyada kolloidal ama submicron-ka la warshadeeyay, waxaa loo isticmaalaa in si sax ah u iftiimaya slurries ee muraayadaha indhaha, wafers semiconductor, iyo warbaahinta booska kaydinta magnetic.

Cabbirkeeda xoogaa joogto ah, adkaanta nidaamsan, iyo la'aanta kiimikada ayaa suurtogal ka dhigaysa aagga dusha sare ee wanaagsan oo lagu dhammaystiray waxyeellada hoose ee ugu yar.

Marka lagu daro xalalka pH-ku-habboon iyo kala-firdhinta polymeric, qiiqa aluminium-ku-salaysan ee qiiqa leh waxay gaadhaan qallafsanaanta aagga heerka nanometer-ka, muhiim u ah walxaha indhaha iyo elektiroonigga ah ee waxqabadka sare leh.

Codsiyada soo ifbaxaya waxay ka kooban yihiin qorshaynta kiimikada-farsamada (CMP) wax soo saarka semiconductor hal-abuur leh, Halka qiimaha saxda ah ee alaabta laga saarayo iyo isku-duubnaanta dusha sare ay muhiim u yihiin.

Isticmaalkii hore ee caadiga ahaa, alumina qiiqa ayaa lagu baadhayaa kaydinta tamarta, unugyada dareenka, iyo alaabta ololka celisa, halkaas oo ammaankeeda kulaylka iyo waxqabadka dusha sare ay bixiyaan faa'iidooyin kala duwan.

In aan ku soo gunaanado, alumina fumed waxay ka dhigan tahay isku darka injineernimada nanoscale iyo dabacsanaan faa'iido leh.

Laga soo bilaabo asalkiisa holac-sameeyay ilaa doorkeeda xakamaynta rheology, xoojinta isku dhafan, catalysis, iyo wax soo saarka saxda ah, sheygan wax qabadkiisu sareeyo wuxuu sii wadaa inuu u ogolaado tignoolajiyada qaybaha kala duwan ee farsamada.

Sida baahida loo qabo badeecooyin horumarsan oo leh dusha ku habaysan iyo sifooyin badan, alumina qiiqa leh ayaa weli ah awood bixiyaha jiilka soo socda ee warshadaha iyo nidaamyada elektiroonigga ah.

Bixiye

Shirkadda Alumina Technology Co., Ltd., Ltd diiradda saaray cilmi-baarista iyo horumarinta, wax soo saarka iyo iibinta budada oxide aluminium, aluminium oxide alaabta, aluminium oxide crucible, iwm., u adeegida qalabka elegtarooniga ah, dhoobada, kiimikaad iyo warshado kale. Tan iyo markii la aasaasay 2005, shirkadu waxa ay ka go’an tahay in ay macaamiisha u soo bandhigto wax soo saarka iyo adeegyada ugu wanaagsan. Haddii aad raadinayso tayo sare leh budada gamma aluminium, fadlan xor u noqo inaad nala soo xidhiidho. ([email protected])
Tags: Aluminium fuushan,aluminium,isticmaalka budada aluminium

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