I-Hielscher Ultrasound Technology

Ukuxoshwa kwe-Ultrasonic ye-Carbon Nanotubes (CNT)

I-Carbonnanotubes inamandla futhi iguquguquka kodwa ihlangene kakhulu. Kunzima ukusabalalisa eziketsheni, njengamanzi, i-ethanol, i-oil, i-polymer noma i-epoxy resin. I-Ultrasound iyindlela ephumelelayo yokuthola okungaqondakali – abangashadile abangashadile – carbonnanotubes.

I-Carbonnanotubes (CNT) isetshenziselwa ukunamathisela, ukugqoka kanye nama-polymers kanye nokugcwalisa kagesi kuma-plastiki ukukhipha amacala okugaya emshinini kagesi nasemaphaketheni omzimba wezimoto ezidwebekayo. Ngokusebenzisa ama-nanotubes, ama-polymers angenziwa amelane kakhulu namazinga okushisa, amakhemikhali ahlukumezayo, izindawo ezilimazayo, izingcindezi eziqine kakhulu nokuxoshwa. Kunezigaba ezimbili ze-carbon nanotubes: I-Single-wall nanotubes (SWNT) namanotubes amaningi wodonga (MWNT).

Ukwelashwa kwe-Ultrasonic kuyindlela elula futhi ephumelelayo yokusabalalisa i-carbon-nanotubes emanzini noma emagumbini e-organic.I-Carbonnanotubes ngokuvamile iyatholakala njengempahla eyomile, isib. Kusuka ezinkampanini, ezifana I-SES Research noma i-CNT Co., Ltd. Inqubo elula, enokwethenjelwa neyokwehlakala yokudonswa kwemvelo kuyadingeka, ukuze kusetshenziswe ama-nanotubes ekufinyeleleni kwawo okuphezulu. Ukuze uketshezi olufika ku-100,000cP ultrasound wubuchwepheshe obuphumelelayo kakhulu ekuhlakazeni ama-nanotubes emanzini, amafutha noma ama-polymers ezindaweni eziphansi noma eziphakeme. Imifudlana ye-jet stream evela ku cavitation ultrasonic, unqobe amandla okubambisana phakathi kwama-nanotubes, futhi uhlukanise amashubhu. Ngenxa ye-ultrasonically generated shear forces kanye nama-turbulences ama-ultrasound angasiza ekugubungweni okuphezulu kanye nokuphendula kwamakhemikhali ama-nanotubes nezinye izinto, nazo.

I-Ultrasonication iyinkambiso ephumelelayo yokukhipha i-carbonnanotubes emanzini noma kumakhemikhali ephilayo.Ngokuvamile, i-nanotube-dispersion encane iqala kuqala nge-stirrer ejwayelekile bese i-homogenized in the reactor ultrasonic flow cell. Ividiyo engezansi (Chofoza isithombe ukuze uqale!) Ibonisa isilingo selebhu (sonication batch usebenzisa a UP400S) ukuhlakaza i-carbonnanotubes emanzini amaningi emanzini aphansi. Ngenxa yemvelo yamakhemikhali yokuziphatha ukuhlakazeka kwamanotubes emanzini kunzima kunzima. Njengoba kuboniswe kule vidiyo, kungabonakaliswa kalula ukuthi i-ultrasonication iyakwazi ukusabalalisa ama-nanotubes ngempumelelo.

Ukuhlakazeka kwe-SWNTs ngayinye yobude obuphezulu

Inkinga enkulu yokucubungula nokuphathwa kabi kwe-SWNTs yi-insolubility engabonakaliyo yamatayipi e-solvents ajwayelekile kanye namanzi. Ukusebenza komdanso ohlangothini lwe-nanotube noma iziphetho ezivulekile ukudala isikhombimsebenzisi esifanele phakathi kwe-SWNTs kanye ne-solvent ngokuvamile kuholele ekuxosheni okuyingxenye yezintambo ze-SWNT, kuphela.
Ngenxa yalokho, i-SWNTs ihlakazeka njengezicucu kunokuba izinto ezizimele zodwa. Uma izimo ezinzima kakhulu zisetshenziswa ngesikhathi sokuhlakazeka, i-SWNTs ifushane ukuze ibude phakathi kwama-80 no-200nm. Nakuba lokhu kuyasiza ekuvivinyeni okuthile, lobude buyingcosana kakhulu kwizicelo eziningi ezisebenzayo, njenge-semiconducting noma ukuqinisa i-SWNTs. Ukwelashwa okulawulwayo, okunomsoco we-ultrasonic (isib. By UP200Ht ne-sonotrode engu-40mm) inqubo ephumelelayo yokulungisa ukuhlakazeka kwama-SWNTs omude. Ukulandelana kwe-ultrasonication emnene kuncipha ukunciphisa futhi kuvumela ukulondolozwa okuphelele kwezakhiwo zesakhiwo kanye ne-elektroniki.

Ukuhlanzwa kwe-SWNT yi-Polymer-Assisted Ultrasonication

Kunzima ukutadisha ukuguqulwa kwamakhemikhali we-SWNTs ezingeni lemangqamuzana, ngoba kunzima ukuthola ama-SWNTs ahlanzekile. I-SWNTs esekhulile iqukethe ukungcola okuningi, njengezinhlayiya zensimbi nama-amorphous carbons. I-ultrasonication ye-SWNTs kwisisombululo se-monochlorobenzene (MCB) ye-poly (methyl methacrylate) i-PMMA elandelwe ukuhlunga kuyindlela ephumelelayo yokuhlanza i-SWNTs. Le ndlela yokuhlanza i-polymer ivumela ukukhipha ukungcola kusuka kwi-SWNTs ekhulile. (Yudasaka et al.) Ukulawulwa okulungile kwe-ultrasonication amplitude kuvumela ukukhawulela umonakalo kuma-SWNTs.

Hielscher a ububanzi bamadivayisi we-ultrasonic kanye nezesekeli zokusabalalisa ngokuphumelelayo kwama-nanotubes.

Cela ulwazi oluthe xaxa!

Sicela ugcwalise leli fomu, uma ufisa ukucela ulwazi olwengeziwe mayelana nokusetshenziswa kwe-ultrasound ukusabalalisa i-carbon-nanotubes.









Sicela uqaphele wethu Inqubomgomo yobumfihlo.


Izincwadi

Koshio, A., Yudasaka, M., Zhang, M., Iijima, S. (2001): Indlela Elula Yokuzama Ukwelapha I-Single-Wall Crabon Nanotubes Ngezinto Eziphilayo Ukusebenzisa I-Ultrasonication; ku-Nano Letters, Vol. 1, No. 7, 2001, k. 361-363.

Yudasaka, M .; I-Zhang, M .; IJab, C .; Iijima, S. (2000): I-Appl. Phys. A 2000, 71, 449.

Paredes, JI, Burghard, M. (2004): Ukusabalalisa kwe-Individual Single Walled Carbon Nanotubes yobude obuphakeme, ku: Langmuir, Vol. 20, No. 12, 2004, 5149-5152, i-American Chemical Society.