I-Hielscher Ultrasound Technology

Inqubo ye-Ultrasonic Precipitation

Ama-particles, isib. Nanoparticles angakhiwa phansi-up ngeziphuzo ngokusebenzisa imvula. Kulokhu, ingxube ye-supersaturated iqala ukwakha izinhlayiya eziqinile ngaphandle kwezinto ezigxilwe kakhulu ezizokhula futhi ekugcineni zifinyelele. Ukuze ulawule usayizi wezinhlayiyana / i-crystal kanye ne-morphology, ukulawula phezu kwemvula kuthonya izici kubalulekile.

Ingemuva

Phakathi neminyaka yamuva, ama-nanoparticles athola ukubaluleka emikhakheni eminingi, njengezingubo, ama-polymers, ama-inks, izidakamizwa noma i-electronics. Esinye isici esibalulekile esithinta ukusetshenziswa kwama-nanomaterials yizindleko ze-nanomaterial. Ngakho-ke, izindlela ezibiza izindleko zokukhiqiza ama-nanomaterials ngobuningi obukhulu ziyadingeka. Ngenkathi izinqubo, njengawe emulsification futhi ukucubungula okuqhubekayo kukhona izinqubo eziphezulu, imvula yinkinga ephansi yokuhlanganisa ama-particle we-nano-size kusuka kulesosizi. Umgwaqo uhilela:

  • Ukuxuba okungenani iziphuzo ezimbili
  • I-Supersaturation
  • i-nucleation
  • Ukukhula kwamathambo
  • I-agggomeration
    (Ngokujwayelekile kugwenywe ukuhlushwa okuphansi noma ngokumisa ama-agent)

Ukuxuba

Ukuxubana kuyisinyathelo esibalulekile emvula, njengenqubo yokwephuza iningi, ijubane lokuphendula kwamakhemikhali liphakeme kakhulu. Ngokuvamile, ama-tank reactors agxumekile (i-batch noma eqhubekayo), ama mixer static noma ama-rotor-stator asetshenziselwa ukusabela kwemvula. Ukusatshalaliswa okungahambisani kwamandla nokuxuba emkhatsini wenqubo yomsindo kunciphisa ikhwalithi yamanoparticles ahlanganisiwe. Lokhu ukungalungi kwanda njengoba ivolumu yomthamo ikhula. Ukuxubungula ubuchwepheshe obuphambili nokulawulwa okuhle phezu kwemiphawulo yemithonya kubangela izinhlayiya ezincane kanye ne-homogeneity engcono yezinhlayiya.

Ukusetshenziswa kokufaka ama-jets, ama-mixers amancane, noma ukusetshenziswa kwe-Taylor-Couette isenzo senza ngcono ukuxuba nokuxubana komuntu. Lokhu kuholela esikhathini esifushane sokuxuba. Kodwa lezi zindlela zilinganiselwe ukuthi kungenzeka ukuthi zizofakwa.

I-Ultrasonication iyinkinga yokuxuba okuthuthukisiwe ehlinzeka nge-shear ephezulu futhi evuselela amandla ngaphandle kokulinganiselwa kwe-scale-up. Ibuye ibuye ivumele ukulawula imingcele ebusayo, njengokufakelwa kwamandla, umklamo we-reactor, isikhathi sokuhlala, i-particle, noma i-concentration reactant ngokuzimela. I-cavitation ye-ultrasonic ikhuthaza ukuxuba okuncane kwe-micro futhi ihlakaze amandla aphezulu endaweni yakini.

I-Magnetite Nanoparticle Ukwehliswa

Kwenzelwe Sono-chemical ophendulayo (Banert et al., 2006)Ukusetshenziswa kwe-ultrasonication kuya kwezulu kwaboniswa ku- I-ICVT (TU Clausthal) ngu I-Banert et al. (2006) for magnetite nanoparticles. I-Banert isetshenzisiwe isakhi se-sono-chemical esilungisiwe (isithombe sokunene, sondla 1: ikhambi lensimbi, isondlo 2: i-agent yesikhukhula, Chofoza ukuze ubone ukubuka okukhulu!) ukukhiqiza nanoparticles magnetite “ngo-co-precipitation yesisombululo se-aqueous of iron (III) i-chloride hexahydrate nensimbi (II) i-sulfate heptahydrate ngenani le-molar lika-Fe3+/ Fe2+ = 2: 1. Njengoba i-hydrodynamic pre-mixing ne-macro mixing ibalulekile futhi ibambe iqhaza ekuhlanganiseni i-ultrasonic micro, i-geometry ye-reactor kanye nesimo samapayipi wokudla yizinto ezibalulekile ezilawula umphumela wenqubo. Emsebenzini wabo, I-Banert et al. kuqhathanisa ama-designer ehlukene. Umklamo othuthukisiwe wekamelo lokugubha umonakalo unganciphisa amandla athile adingekayo yi-factor of five.

Isixazululo sensimbi sibhekene ne-ammonium hydroxide egxile kakhulu kanye ne-sodium hydroxide ngokulandelana. Ukuze ugweme noma yiliphi i-pH gradient, i-precipitant kufanele iphethwe ngokweqile. Ukusabalalisa usayizi wezinhlayiyana ze-magnetite kuye kwalinganiswa ngokusebenzisa i-photon correlation spectroscopy (PCS, I-Malvern NanoSizer ZS, i-Malvern Inc.).”

Ngaphandle kwe-ultrasonication, ama-particle we-mean we-particle size angu-45nm akhiqizwa yi-hydrodynamic ukuxuba yedwa. Ukuhlanganiswa kwe-Ultrasonic kwanciphisa ubukhulu bezinhlayiya ezivela ku-10nm nangaphansi. Isithombe esezansi sibonisa ukusabalalisa usayizi wezinhlayiyana zikaFe3O4 izinhlayiya ezikhiqizwa eqhubekayo ultrasonic precipitation yokusabela (I-Banert et al., 2004).

Umfanekiso olandelayo (I-Banert et al., 2006) ubonisa usayizi wezinhlayiya njengento esebenzayo yokufakelwa kwamandla.

“Umdwebo ungahlukaniswa ngezigaba ezintathu eziyinhloko. Ngaphansi kwe-1000 kJ / kgFe3O4 ukuxuba kulawulwa umphumela we-hydrodynamic. Ubukhulu bezinhlayiyana bungaba ngu-40-50 nm. Ngaphezulu kuka 1000 kJ / kg umphumela wokuxubana kwe-ultrasonic kubonakala. Ubukhulu bezinhlayiyana buyehla ngaphansi kwe-10 nm. Ngokunyuka okuqhubekayo kokufakelwa kwamandla okuqondile ubukhulu bezinhlayiyana buhlala ngendlela efanayo yobukhulu. Ukuxuba kuyashesha ngokwanele ukuvumela i-nucleation ejwayelekile.”

Cela ulwazi oluthe xaxa!

Sicela usebenzise ifomu elingezansi, uma ufisa ukucela ulwazi oluthe xaxa mayelana ne-homogenization yama-ultrasonic. Sizojabula ukukunikeza uhlelo lwe-ultrasonic ukuhlangabezana nezidingo zakho.









Sicela uqaphele wethu Inqubomgomo yobumfihlo.


Izincwadi

I-Banert, T., i-Horst, i-C., i-Kunz, u-U, i-Peuker, i-UA (2004), iKontinuierliche Fällung im Ultraschalldurchflußreaktor i-Beispiel von Eisen- (II, III) i-Oxid, i-ICVT, i-TU-Clausthal, i-Poster efakwe kuMhlangano Wonyaka we-GVC.

I-Banert, T., i-Brenner, i-G., i-Peuker, i-UA (2006), ukusebenza kwemingcele ye-sono-chemical precipitation reactor, Proc. 5. I-WCPT, i-Orlando Fl., 23.-27. April 2006.