Silica yog siv nyob rau hauv ntau yam kev lag luam rau nws hnav tsis kam, hluav taws xob rwb thaiv tsev thiab siab thermal stability. Ultrasonic dispersion pab kom qhib lub peev xwm ntawm silica los ntawm kev txhim kho kev sib cais zoo.
Silica Daim Ntawv Thov
Silica (Sio2) yog cov khoom siv ntau tshaj plaws Nws yog siv los ua cov muab tub lim, ua tau zoo ntxiv, rheology kho tshuab lossis ua cov khoom siv, cov khoom siv, cov khoom siv hluav taws xob, cov tshuaj nplaum lossis rwb thaiv tsev. Tshwj xeeb, silica fume (Amorphous silica) lossis microsilica ntxiv rau hauv av los txhim kho cov pob zeb ua kom muaj zog thiab kav ntev. Silica fume kuj siv nyob rau hauv refractory pob zeb ua kom txo porosity thiab txhim kho lub zog los ntawm kev txhim kho particle packing.
Silica Dispersion
Silica muaj nyob rau hauv ntau yam ntawm hydrophhilic thiab hydrophobic cov ntawv thiab feem ntau yog siv nyob rau hauv qhov ntau thiab tsawg tus cwj pwm zoo heev. Feem ntau, silica tsis cuam tshuam zoo tom qab ntub dej. Nws kuj ntxiv ntau ntawm cov pa me me npuas rau cov mis.
Rau cov ntawv thov silica feem ntau, zoo thiab muaj kev sib cais yog qhov tseem ceeb. Tshwj xeeb tshaj yog thaum siv cov xim tha xim thiab lacquers los txhim kho qhov kev pov tseg me me, cov sillica yuav tsum tau ua kom me me kom tsis txhob ua rau taws teeb thiab saib xyuas qhov tseeb. Rau feem ntau txheej, silica xav tau tsawg dua 40nm kom tau raws li qhov xav tau no. Rau lwm cov ntawv thov, particle agglomeration txwv txhua tus neeg Silica particle los ntawm kev cuam tshuam nrog nruab nrab ib puag ncig. Ultrasonication tau muab pov thawj kom ua tau zoo dua hauv Silica Disidersion piv rau lwm cov siab siab sib xyaw txoj kev. Ntawm kev sib sau sib luag loj dua 200 microns, feem ntau cov lus tau raug txo kom tsawg dua 200 nanometers.
Ultrasonic Kev Kho Mob
Peb Ti2 hmoov tau siv hauv txoj haujlwm no: Nanoparticle P25, Nanoparticle ST21 thiab submicron HT0514. P25 thiab HT0514 tau npaj los ntawm cov roj theem synthesis; St21 tauricated los ntawm ntub tshuaj lom hluavtaws synthesis. Sodium polyacrylates (PAA) nrog nruab nrab molecular hnyav ntawm 1200, 21000, 15000 thiab 30,000 tau siv ua polymeries dispersants. Txhawm rau npaj ib qho kev ncua aqueous, TiO2 hmoov tau sib xyaw nrog paa hauv dej. Kho Ph Ntawv Ua Si Ph nrog ammonia daws (20%, ntsuas qib). Rau sonication, 50 ml ntawm kev ncua yog sonicated nyob rau hauv 100 ml beaker rau 30 feeb. Txhawm rau tiv thaiv cov dej npau npau thiab paa gelling, kev raug tshem tawm tau irradiated 10 zaug rau 3 min ntawm kev txuas ntxiv rau hauv qhov kub ua kom ntev li 60-70 ° C. Tom qab 3 feeb ntawm txhua qhov chaw nyob hauv kev ua haujlwm tau zoo, qhov kev ncua tau txias txias rau 10 feeb.
Peb siv ob pawg ntawm cov khoom siv ultrasonic, zaus: 20 kHz; amplitude: 30 - 34 hli; Lub zog tiam: 70 - 120 w; Cuab lub taub hau taub: 26 hli, tom qab 30 feeb ntawm kev kho mob ultrasonic, cov dej tau txo los ntawm li 10 vim yog evaporation mL. Tes taw hnyav tau ntsuas ua ntej thiab tom qab sonication, thiab cov dej ntshiab tau ntxiv los them nyiaj rau kev poob. Tsis hais txog ntawm kev co lub zog thiab kev sojntsuam txoj kab uas hla, lub viscosity thiab nruab nrab particle loj me me ntawm lub sijhawm tsis muaj kev cuam tshuam. Nws thiaj li daws tau pob tshab thiab cov SOO2 hais kom me dua.
Lub Sijhawm Post: Apr - 19 - 2022