Kutshanje, uSun Rong kunye nabanye abaphandi abanxulumene nabo abavela kwiShenzhen Institute of Advanced Technology, iChinese Academy of Sciences bacebise icebo elilula lokunyanga ubushushu lenyathelo elinye ukulungiselela izinto zefoam zesilivere ekhaphukhaphu/i-graphene oxide efakwe i-carbonized melamine (CMF/rGO/Ag). Izinto zefoam ze-melamine ezifakwe i-carbonized zibonelele ngeempawu ezintle zoomatshini kunye ne-EMI shielding effect (EMI SE).
Ukunyuka konxibelelwano lwe-5G kunye neefowuni ezihlakaniphile kuye kwandisa ingxaki yokuphazamiseka kwe-electromagnetic.
Uphazamiseko olumandla lwe-electromagnetic lunokubangela ukulahleka kwedatha, ukusilela kwenkqubo, kunye nokubabeka emngciphekweni impilo yabantu.
Uphuhliso lwezixhobo ezikhuselayo zokuphazamiseka kwe-electromagnetic ezisebenza kakhulu ezinoxinano olusezantsi kakhulu kunye nokuguquguquka okuhle komatshini yindlela esebenzayo yokucinezela ungcoliseko oluyingozi lwe-electromagnetic wave okanye imitha.
Kwizinto zensimbi zendabuko, ukuphuculwa kwe-conductivity kuye kwaba yinkqubo ephambili yokufezekisa izinto zokukhusela eziphezulu.
Ukongeza, ama-nanomaterials amatsha afana negraphene, i-carbon nanotubes, kunye ne-MXene nazo ziye zaxelwa ukuba zine-EMI ephezulu yokukhusela ukusebenza.
Ngenxa yenkqubo yokwenziwa kwe-nanomaterials eguquguqukayo kakhulu, ezi zixhobo zicutshungulwa zibe yi-foam okanye ifom yefilimu yokukhusela i-EMI. Xa kuthelekiswa nohlobo olunegwebu lwe-nanomaterials, iifilimu ezishinyeneyo zibonisa ukusebenza okuphezulu.
Ukuqhuba okuphezulu kunokuvelisa ngokuthe ngqo i-EMI SE ephezulu ngokubonakalisa ngamandla amaza ombane wombane.
Umzekelo, i-electromagnetic wave reflection coefficient yeentsimbi ezisebenza kakhulu ihlala ingaphezulu kwe-90%, nto leyo ethetha ukuba ama-90% esiganeko samaza ombane aya kubonakaliswa kwindawo ekhululekileyo.
Amaza e-electromagnetic abonakalisiweyo nawo anokubangela ungcoliseko lwemitha yombane wesibini. Kusengumceli mngeni ukufumana izixhobo zokukhusela ze-EMI eziphezulu kunye ne-electromagnetic wave reflection coefficient ephantsi.
Izinto ezikhuselayo zohlobo lwe-foam zenziwe ngesakhiwo se-porous. Ngenxa yobunzima bayo, ukucinezeleka kakuhle koomatshini kunye nokusebenza okuguquguqukayo kwe-EMI, inamandla amakhulu ekutshintsheni izinto zemveli eziqinileyo zokukhusela isinyithi.
Ngokukodwa, ubume beporous lwenza ukuba izinto ezikhuselayo zohlobo logwebu zibe nokubonakaliswa okucacileyo okuninzi kumaza ombane wombane, ukuze ugwebu lufunxe kwaye luthintele amaza ombane. Kuye kwaxelwa ukuba i-porous structure iya kwandisa ukufunxwa kwamaza ombane we-electromagnetic yi-MXene.
Xa kuthelekiswa nezixhobo ezomeleleyo, ubume beporous bunobuchule obungcono bokuhambelana ne-electromagnetic wave, kwaye kunokwenza amaza ombane ombane angene kulwakhiwo lwangaphakathi lwegwebu elikhuselayo. Ke ngoko, izixhobo ezikhuselayo ze-EMI ezine-coefficient esezantsi yokubonisa kunye ne-coefficient ephezulu yokufunxa kufuneka ibe ne-impedance ehambelanayo (imbonakalo ephantsi) kunye nokubonakaliswa okuninzi. Ngokomzekelo, izakhiwo ezinqamlekileyo, izakhiwo ezininzi kunye nezakhiwo ze-isotropic zilungiselelwe, kunye ne-EMI SE ephezulu kunye ne-absorption coefficients. Ngokuqhelekileyo, izakhiwo ezintsonkothileyo kunye namacandelo amaninzi zihlala zibandakanya ukusetyenzwa kwamanyathelo amaninzi, kwaye ukuguquguquka koomatshini kungalunganga.
I-foam ye-polyimide efakwe ngesilivere yalungiswa ngendlela yokutshiza ngokomzimba, kwaye ukuxinwa kwayo kwakuyi-23kg / m3. I-foam ye-melamine efakwe ngesilivere yalungiswa ngokubekwa kweekhemikhali. I-foam ye-melamine elungiselelwe isilivere ine-EMI ephezulu ye-SE ye-90 dB kunye nomxholo wesilivere we-63.5 wt%. Ukongeza, i-polymethacrylimide ye-polymethacrylimide ye-polymethacrylimide ye-foam egqunywe nge-polymethacrylimide ye-polymer kunye ne-nanoparticle yegolide efakwe kwi-polymer-based nanofiber electromagnetic interference shielding electroless plating method iyacetyiswa.
Nangona kunjalo, ngenxa yokungahambelani kojongano phakathi kwentsimbi eyomeleleyo kunye nesakhelo esiguqukayo, izixhobo zokukhusela amagwebu esinyithi ezilungiswe ngokwenziwa kwe-electroplating, ukucwenga ngombane kunye nokutshiza ngokwasemzimbeni kuneempawu ezimbi zoomatshini. Ukuphucula ukudibanisa phakathi kweengqungquthela zetsimbi kunye ne-foam skeleton eguquguqukayo kunye nokuqonda izinto zokukhusela i-foam yensimbi kunye neempawu ezibalaseleyo zoomatshini zisekho imingeni.
Kolu phononongo, umbhali ucebise isicwangciso esilula sokunyanga ubushushu benyathelo elinye ukulungiselela isilivere ekhaphukhaphu / encitshisiweyo yegraphene oxide efakwe i-carbonized melamine (i-CMF / rGO / Ag) i-foam edibeneyo, eneempawu ezigqwesileyo zoomatshini kunye nesiphumo esihle kakhulu sokukhusela i-EMI (EMI SE). Ngenxa yojongano oluphuculweyo phakathi kwesakhelo esihlanganisiweyo kunye nesilivere, i-CMF/rGO/Ag foam ibonise uzinzo olugqwesileyo lolwakhiwo emva kwemijikelo yovavanyo lokunyanzeliswa kwe-1000 yokulayisha. Ukongezelela, i-EMI SE ye-foam ifikelele kwi-50.6 dB ekuxininiseni kuphela i-16 mg cm2 g-1 kunye ne-ultra-low Ag content ye-0.09 vol%.
Okubangel 'umdla kukuba, intsebenziswano yesakhelo se-porous kunye ne-interfaces ezininzi ibangele i-coefficient yokufunxa ephezulu ngokungaqhelekanga (ngaphezu kwe-0.5) ye-CMF/rGO/Ag foam. Indlela yokukhusela i-coefficient ephezulu yokufunxa ye-CMF/rGO/Ag foam yaphinda yaphononongwa ngohlalutyo lwento ephelelisiweyo (FEA). Ukusebenza kwe-EMI ekufutshane nentsimi ekhuselayo ye-CMF/rGO/Ag ye-Ag ibonisa ukuba ubuninzi obuphantsi, i-foam eyomeleleyo ye-CMF/rGO/Ag ineenzuzo ezinkulu kunye nethemba elibanzi lesicelo njengezinto ezikhuselayo ze-EMI zokupakishwa kwe-elektroniki.