I-Hielscher Ultrasound Technology

I-Sonochemical Synthesis ye-Latex

I-Ultrasound yenza futhi ikhuthaze ukusabela kwamakhemikhali ngenxa ye-polymerization ye-latex. Ngamandla e-sonochemical, ukukhanya kwe-latex kwenzeka ngokushesha nangokuphumelelayo. Ngisho nokusingatha ukuphendula kwamakhemikhali kuba lula.
Izinhlayiya ze-Latex zisetshenziselwa kabanzi njengezengezo zezinto ezihlukahlukene. Amasimu okusebenza ajwayelekile afaka ukusetshenziswa njengezithasiselo ezenziwe ngopende nezingubo zokugqoka, ama-glues nesimenti.
Ukuze i-polymerization ye-latex, i-emulsification nokusabalalisa kwesisombululo esisisindayo yokusabela kuyinto ebalulekile ethonya izinga le-polymer ngokuphawulekayo. I-Ultrasound yaziwa njengendlela ephumelelayo neyokwethenjelwa yokusakazeka nokumisa. Ikhono eliphakeme le-ultrasonics yikhono lokudala dispersions futhi Emulsions hhayi kuphela kwi-micron- kodwa nakububanzi be-nano-size. Ukuze i-synthesis of latex, i-emulsion noma ukusabalalisa kwama-monomers, isb polystyrene, emanzini (o / w = ama-in-water Emulsion) yisisekelo sokuphendula. Ngokuya ngohlobo lwe-emulsion, kungadingeka ukuthi inani elincane le-surfactant liyadingeka, kodwa ngokuvamile amandla e-ultrasonic anikezela ukusabalalisa okuhle kakhulu kwe-droplet ukuze umuntu osebenza ngokuziqhenya angabonakali. Uma i-ultrasound ene-amplitudes ephezulu ingeniswa ngamanzi, isenzakalo se-cavitation okuthiwa senzeke. Ukuqhuma kwamanzi kanye nama-bubbles vacuum akhiqizwa ngesikhathi sokushintshanisa ukucindezela okuphezulu nokucindezela okuphansi. Uma lezi zibhamu ezincane zingenakuthola amandla amaningi, zifakaza phakathi nomjikelezo ophezulu wokucindezela, ukuze kugcizelelwe ukucindezela kuze kufike ku-1000 bar kanye namaza wokushaqeka kanye nama-jets e-liquid afika ku-400 km / h endaweni. [Suslick, 1998] Lezi zinamandla ezinkulu, ezibangelwa i-cavitation ye-ultrasonic, ziyasebenza kumaconsi amancane kanye nezinhlayiya. I-radicals yamahhala eyakhiwe ngaphansi kwe-ultrasonic cavitation qalisa i-polymerization ye-chain reaction yamanzi emanzini. Amaketanga e-polymer akhula futhi ayenze izinhlayiya eziyisisekelo ezinama-10-20 nm. Izinhlayiya eziyinhloko zigcwele ama-monomers, futhi ukuqaliswa kwamaketanga e-polymer kuqhubeka esigabeni se-aqueous, i-polymer radicals ekhulayo ibanjwe yizinhlayiya ezikhona, futhi i-polymerization iyaqhubeka ngaphakathi kwezinhlayiya. Ngemva kokuba izinhlayiya eziyinhloko zakha, yonke i-polymerization eqhubekayo yandisa ubukhulu kodwa hhayi inani lezinhlayiya. Ukukhula kuqhubeka kuze kube yilapho yonke i-monomer isidliwe. I-diameter yokugcina i-particle diameter ngokuvamile i-50-500 nm.
I-Sono-synthesis ingenziwa njenge-batch noma njengenqubo eqhubekayo.

I-Ultrasonic flow flow cell reactors ivumela ukuqhutshwa okuqhubekayo.

Uma i-polystyrene i-latex isetshenziselwa umzila we-sonochemical, izinhlayiya ze-latex ezinamazinga amancane angu-50 nm futhi isisindo esiphakeme samangqamuzana esingaphezu kuka-106 g / mol singatholakala. Ngenxa ye-emulsification esebenzayo ye-ultrasonic, kuphela inani elincane le-surfactant elizodingeka. I-ultrasonication eqhubekayo isetshenziselwa isisombululo se-monomer idala ama-radicals okwanele azungeze amaconsi amantombazane, okuholela ezincane kakhulu ze-latex izinhlayiya ngesikhathi se-polymerization. Ngaphandle kwemiphumela ye-ultrasonic polymerization, izinzuzo ezengeziwe zalolu ndlela yizona ezisezingeni eliphansi lokuphendula lokushisa, ukulandelana okusheshayo kokulandelana kanye nekhwalithi yezinhlayiya ze-latex ngenxa yesisindo esiphakeme sama-molecular of the particles. Izinzuzo ze-polymerization ye-ultrasonic zisebenza futhi nge-copolymerization e-ultrasonically-basizwa. [Zhang et al. 2009]
Umphumela ongase ube khona we-latex uzuzwa ngokuhlanganiswa kwe-ZnO nanolatex ehlanganisiwe: I-nannatex eyakhiwe nge-ZnO ibonisa ukusebenza okuphezulu okungaqondile. Esifundweni seSonawane et al. (2010), i-ZnO / poly (i-methacrylate ye-butyl) kanye ne-ZnO-PBMA / polyaniline nanolatex izinhlayiyana ezihlanganisiwe ezingama-50 nm zenziwe nge-sonochemical emulsion polymerization.
Hielscher Ultrasonics Amadivayisi aphakeme kakhulu we-ultrasound amathuluzi athembekile futhi asebenzayo sonochemical ukusabela. Amaprosesa ahlukahlukene e-ultrasonic ahlukene ngamandla namasethi we-setups enza isiqiniseko sokunikeza ukulungiswa okuhle kwenqubo ethile kanye nevolumu. Zonke izinhlelo zokusebenza zingahlolwa kulebhu bese zihlanganiswa kuze kube ngosayizi wokukhiqiza, ngokulinganayo. Imishini ye-Ultrasonic yokucubungula okuqhubekayo kwimodi yokugeleza ingahle ibuyekezwe kalula emigqeni yokukhiqiza ekhona.
UP200S - Hielscher's powerful 200W ultrasonicator for sonochemical processes

idivayisi ultrasonic UP200S

Xhumana Nathi / Cela Ukwaziswa Olwengeziwe

Khuluma nathi mayelana nezidingo zakho zokucubungula. Sizosikisela ukusetha nokulungiswa kwemingcele efanele yephrojekthi yakho.





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Izincwadi / Izinkomba

  • Ooi, SK; Biggs, S. (2000): Ukuqalisa Ultrasonic of polystyrene latex synthesis. Ultrasonics Sonochemistry 7, 2000. 125-133.
  • Sonawane, SH; I-Teo, BM; U-Brotchie, A .; I-Grieser, F .; U-Ashokkumar, M. (2010): I-Sonochemical Synthesis ye-ZnO Incaphuni ye-Nanolatex esebenzayo kanye noMsebenzi wayo wokuAnticorrosive. Izimboni & I-Engineering Chemistry Research 19, 2010. 2200-2205.
  • Suslick, KS (1998): i-Kirk-Othmer Encyclopedia ye-Chemical Technology; Umhlaka 4 J. Wiley & Amadodana: New York, Umq. 26, 1998. 517-541.
  • I-Teo, BM .; Ashokkumar, M .; I-Grieser, F. (2011): I-polymerization ye-sonochemical ye-miniemulsions ezinxutheni eziqukethe amanzi / amanzi. I-Physical Chemistry Chemical Physics 13, 2011. 4095-4102.
  • I-Teo, BM .; Chen, F .; I-Hatton, TA; I-Grieser, F .; Ashokkumar, M .; (2009): I-novel eyodwa embizeni yama-latenet nanoparticles nge-ultrasonic irradiation.
  • I-Zhang, K .; Ipaki, i-BJ; Fang, FF; Choi, HJ (2009): Ukulungiswa kwe-Sonochemical ye-Polymer Nanocomposites. Ama-molecule 14, 2009. 2095-2110.