Nyob rau hauv lub era ntawm 5G high zaus thiab proliferating antennas, electromagnetic kuab paug tau dhau los ua ib tug tuag daim ntawv pov thawj rau cov khoom siv hluav taws xob. Cov tsoos hlau thaiv npog npog yog hnyav thiab qhov chaw-siv, thiab cov pa roj carbon nanotubes tau raug thawb mus rau theem electromagnetic shielding. Txawm li cas los xij, R & D engineers yeej ib txwm muaj kev tsis ntseeg: yuav ua li cas ua tau zoo electromagnetic shielding kev ua tau zoo ntawm carbon nanotubes? Lawv puas tuaj yeem hloov cov ntaub thaiv npog hlau? Qee tus neeg khav theeb tias cov txheej nyias nyias tuaj yeem tiv thaiv 99.9% ntawm cov hluav taws xob, tsuas yog pom tias nws tsis tuaj yeem tiv thaiv crosstalk hauv lub chassis. Qhov no tsis yog ib qho yooj yim hloov cov khoom siv, tab sis yog qhov kev ua si loj ntawm kev nqus thiab kev xav ntawm ib qho -sib nqus hluav taws xob network thiab peb- qhov ntev ntawm cov hlau ntom ntom hauv microwave zaus band. Niaj hnub no, peb yuav tev tawm cov tswv yim lim dej thiab siv cov ntaub ntawv nyuaj kom nthuav tawm cov ntawv tiv thaiv electromagnetic ntawm CNTs.
1. Lub hauv paus ntawm Shielding: Yuav ua li cas zoo Electromagnetic Shielding Performance ntawm Carbon Nanotubes?
Cov pa roj carbon nanotubes muaj qhov ua tau zoo ntawm electromagnetic shielding zoo nyob rau hauv cov ntaub ntawv sib xyaw ua ke. Cov yeeb yaj kiab lossis cov yas ntawm cov tuab tshwj xeeb tuaj yeem ua tiav 40-60 dB (shielding 99.99% ntawm electromagnetic nthwv dej), nrog rau cov tub ntxhais nyob rau hauv lub synergistic mechanism ntawm kev xav, nqus, thiab sab hauv ntau qhov kev xav.
Hlau shielding feem ntau yog nyob ntawm qhov kev xav ntawm qhov chaw los ntawm kev siv hluav taws xob siab. Vim li cas electromagnetic shielding kev ua tau zoo ntawm carbon nanotubes thiaj li muaj zog? Vim tias lawv tsis tsuas yog xav txog tab sis kuj "nqus" nthwv dej. Thaum cov electromagnetic nthwv dej tsoo lub intertwined peb -dimensional conductive network ntawm CNTs, lawv thawj zaug ntsib kev xav los ntawm cov phab ntsa conductive siab heev. Cov nthwv dej uas nkag mus yuav raug suav tsis txheeb "sab hauv ntau qhov kev xav" hauv qhov tshawb nrhiav los ntawm ntau tus nanotubes. Nyob rau tib lub sijhawm, cov khoom siv hluav taws xob hauv cov pa roj carbon monoxide oscillate ntawm ntau zaus nyob rau hauv lub microwave hluav taws xob, hloov hluav taws xob hluav taws xob mus rau hauv tshav kub dissipation (absorption poob). Qhov no dual mechanism ntawm "reflection + absorption" tso cai rau ib tug nyias nyias CNT network kom ua tau raws li kev tiv thaiv zoo (SE).
| Shielding Mechanism Classification | Hlau thaiv npog (piv txwv li, tooj liab / aluminium) | Carbon Nanotube Composite Zaj duab xis / Yas | Lub luag hauj lwm Loj thiab cov lus piav qhia |
|---|---|---|---|
| Reflection Loss (R) | Siab heev (dense nto electron hiav txwv reflection) | Nruab nrab-siab (nyob ntawm kev sib txuas network) | Hlau -dominated mechanism, CNT- pab |
| Absorption poob (A) | Tsawg heev (cov nyhuv ntawm daim tawv nqaij yog nyias heev) | Siab heev (ib -sib nqus network ntau qhov tawg) | CNT-tswj cov txheej txheem, hloov hluav taws xob electromagnetic rau hauv tshav kub |
| Ntau qhov cuam tshuam sab hauv (M) | Yuav luag tsis muaj (nto yog du heev) | Qhov tseem ceeb (kev sib txawv ntawm cov phab ntsa ntawm lub raj) | CNT network internal maze effect |
| Tag nrho cov kev tiv thaiv kev tiv thaiv (0.1mm thickness) | 60 - 80 dB | 40 - 60 dB | Advanced Materials ntsuas qhov ntsuas |
2. Kev Sib Tham Txog Kev Hloov: Lawv puas tuaj yeem hloov cov ntaub thaiv hlau ua tiav?
Cov pa roj carbon nanotubes tsis tuaj yeem hloov cov hlau ntom ntom hauv txhua qhov xwm txheej. Txawm li cas los xij, nyob rau hauv cov xwm txheej tshwj xeeb xws li "lub teeb yuag, hloov tau yooj yim, thiab kev tiv thaiv corrosion" (xws li cov khoom siv tau yooj yim shielding, drone shells, conductive coatings), lawv twb tau ua tiav qhov kev hloov pauv ntawm cov hlau.
Cov pa roj carbon nanotubes puas tuaj yeem hloov cov ntaub thaiv hlau? Qhov no yuav tsum tau saib los ntawm scenario. Muab piv rau qhov tseem ceeb tiv thaiv nrog 0.1mm tooj liab ntawv ci, CNTs yeej tsis tuaj yeem sib tw. Txawm li cas los xij, nyob rau hauv ntau yam khoom siv niaj hnub no, cov hlau hnyav dhau, nruj heev, thiab nquag oxidation. Piv txwv li, daim thaiv thaiv ntawm lub pob khawm ntawm lub xov tooj foldable tawg thaum khoov, thaum CNT cov yeeb yaj kiab tuaj yeem tiv taus ntau pua txhiab tus khoov yam tsis tau poob kev tiv thaiv zoo. Los yog coj cov roj carbon fiber drone plhaub, uas yog thawj tsis yog -conductive (tsis muaj shielding). Ntxiv me me ntawm CNTs hloov lub plhaub nws tus kheej mus rau hauv ib txheej thaiv uas yuav luag tsis muaj qhov hnyav nce. Hauv cov xwm txheej no, CNTs tsis hloov cov hlau tab sis tshem tawm cov ces kaum tuag uas cov hlau ua tsis tau.
| Core Shielding thiab Physical Parameters | Dense Hlau (Copper Foil / Aluminium Ntawv Nyiaj) | Carbon Nanotube Composite Khoom | Hloov qhov zoo thiab qhov tsis zoo ntawm kev ntsuas |
|---|---|---|---|
| Kev Tiv Thaiv Tsis Muaj Zog (30GHz) | >80dB ib | 40 - 60 dB | Qhov tsis zoo: Qhov kawg tiv thaiv- cuam tshuam tseem xav tau hlau |
| Surface Density (Qhov hnyav) | hnyav heev (8.9 g / cm³) | Lub teeb heev (<1.5 g/cm³) | Qhov zoo: CNTs yog kwv yees li 6 zaug sib dua, qhov hnyav txo qhov txuj ci tseem ceeb |
| Flexibility thiab Bending Resistance | Tsawg heev (yooj yim hardens thiab tawg) | Zoo heev (tuaj yeem tiv taus ntau txhiab tus khoov yam tsis muaj attenuation) | Advantage: Qhov kev daws teeb meem nkaus xwb rau cov khoom siv coj los siv / foldable |
| Corrosion / Oxidation Resistance | Tsis tshua muaj neeg pluag (yooj yim oxidizes, blackens, thiab tsis) | Zoo heev (tag nrho -carbon qauv, tshuaj inert) | Qhov zoo: Ntev - lub sij hawm tiv thaiv rau cov khoom siv hauv hiav txwv / tshuaj lom neeg |
Cov ntaub ntawv siv: Shandong Tanfeng Cov Khoom Siv Tshiab Daim Ntawv Thov R & D Center thiab Cov Khoom Siv Hluav Taws Xob Hluav Taws Xob Hluav Taws Xob Hluav Taws Xob Cov Ntawv Tshaj Tawm ntawm macroscopic CNT zaj duab xis.
3. Qhov tseeb hnyav: Vim li cas koj qhov ntsuas ntsuas qhov ntsuas qhov ntsuas ib txwm poob qis?
Tus neeg ua txhaum tom qab qhov kev poob qis hauv electromagnetic shielding efficiency ntawm carbon nanotubes nyob rau hauv macroscopic composites yog qhov loj heev inter-tube tiv thaiv thiab tawg ntawm cov conductive network tshwm sim los ntawm ib tug nyuaj agglomeration, uas tiv thaiv electrons los ntawm kev teb rau siab - zaus microwave hluav taws xob teb.
Cov raj ntawm tus kheej muaj qhov ua tau zoo kawg, tab sis vim li cas cov yeeb yaj kiab tiv thaiv lossis cov khoom siv yas uas koj ua tau tsuas yog ua tiav 10 dB? Lub ntsiab lus ntawm electromagnetic shielding yog kev sib cuam tshuam ntawm cov hluav taws xob dawb hauv cov khoom siv thiab cov khoom siv hluav taws xob. Yog hais tias cov pa roj carbon nanotubes nruj nreem agglomerated nyob rau hauv lub matrix, los yog yog hais tias cov hlab tsis muaj tiag tiag overlapped nrog ib leeg, cov electrons txav tsis tau, thiab cov conductive network yog tawg. Thaum lub microwaves tawm tsam, lawv ntsib ib pawg ntawm cov yas insulating thiab cov pa roj carbon tawg, uas tsis tuaj yeem cuam tshuam los yog ua rau sab hauv eddy tam sim no nqus, ua rau muaj kev puas tsuaj rau kev tiv thaiv kev ua haujlwm tsis zoo.
| Material Dispersion State | Inter-Tube Contact Resistance | Conductive Network yam ntxwv | Kev Tiv Thaiv Kev Ua Haujlwm (SE) Kev Ua Haujlwm | Cov Kab Ntau Lawm Kab Mob |
|---|---|---|---|---|
| Ib qho yooj yim -Tube Spreading | Tsawg heev | Nruam peb -dimensional "line-rau-line" network | 40 - 60 dB | Tsuas muaj nyob rau hauv txoj kev xav lossis siab -paste kawg |
| Pas Qhuav Hmoov Ntxiv | Siab heev | Hard agglomeration, network tawg | <15 dB (almost no shielding) | Yooj yim sib tov, ntxhib nto |
| Ua phem Ultrasonic Dispersion | Nruab nrab | Cov hlab tawg, degraded rau luv -ntau qhov sib cuag | 20 - 30 dB | Tsawg heev efficiency, tsis tuaj yeem ntsuas |
4. Chaw tsim tshuaj paus Breakthrough: Shandong Tanfeng Yuav ua li cas xa qhov kawg shielding peev xwm ntawm CNTs?
Xaiv lub chaw tsim khoom xws li Shandong Tanfeng uas yog tus paub txog cov thev naus laus zis tseem ceeb ntawm siab -purity synthesis thiab ua ntej-dispersion yog qhov kev daws teeb meem zoo tshaj plaws los hla qhov sib txawv ntawm inter- raj tiv thaiv kev tiv thaiv thiab paub txog qhov kawg electromagnetic shielding kev ua tau zoo ntawm carbon nanotubes.
Txij li thaum lub hauv paus ua rau lies nyob rau hauv kev sib cuag kuj thiab nyuaj agglomeration, cov tshuaj yog "siab purity, ntev tubes, muaj tseeb dispersion." Raws li cov kws tshaj lij CNT cov chaw tsim khoom, Shandong Tanfeng New Material Technology Co., Ltd. qhib cov kab hluav taws xob tiv thaiv kab mob rau koj los ntawm kev sib txuas mus rau dispersion:
Ultra-High Purity Purification tiv thaiv cov dej ntws:Cov hlau residual catalysts tsis tsuas yog ua kom muaj zog hauv zos tab sis kuj tsim cov cua sov txawv txav hauv qab microwaves. Shandong Tanfeng siv cov txheej txheem purification tshwj xeeb los tuav cov hlau seem hauv qab 20 ppm, tshem tawm tag nrho cov teeb meem hauv lub network, ua kom cov macroscopic conductivity, thiab ncaj qha nce kev xav poob.
Ultra-High Aspect Ratio txo qis kev sib tshooj ua haujlwm: The fewer overlap points, the better the network conductivity. Through its self-developed catalytic system, Shandong Tanfeng mass-produces high-quality CNTs with aspect ratios >1500. Cov raj ntev tuaj yeem tsim ib lub network conductive sai heev uas nkag mus rau tag nrho cov matrix ntawm qhov sib ntxiv qis heev, tso cai rau cov electrons dawb los teb rau siab - zaus electromagnetic teb yam tsis muaj kev cuam tshuam.
Customized Pre-Dispersed Paste:Targeting qhov mob taw tes ntawm qhuav hmoov agglomeration, Shandong Tanfeng muab NMP / dej -raws li / tshwj xeeb hnyav ua ntej- dispersed pastes. Los ntawm cov tswv cuab hauv -situ de- kev sib koom ua ke thiab siab - siab ntawm - cov txheej txheem agglomeration, raj pob khoom yog ib qho tiag tiag - raj sib cais. Lub paste fineness D90 yog nruj me ntsis tswj nyob rau hauv 5 μm. Hauv qab, txawm tias rau txheej txheej ncaj qha lossis sib xyaw, kev tiv thaiv kev ua haujlwm ntawm cov ntaub thaiv npog hloov tau yooj yim lossis cov khoom siv yas tuaj yeem cuam tshuam los ntawm 40 dB cim.
Xaus
Rov qab mus rau cov lus nug tseem ceeb: yuav ua li cas ua tau zoo ntawm electromagnetic shielding kev ua tau zoocarbon nanotubes? Lawv puas tuaj yeem hloov cov ntaub thaiv npog hlau? Ntawm txoj kev yooj yim, lub teeb yuag, thiab kev tiv thaiv corrosion, CNTs, los ntawm kev tsim txiaj ntawm lawv "kev xav + ntau qhov nqus" mechanism, twb tau pinned hlau loj, dhau los ua ib qho yuav tsum tau ua rau - tiam tom ntej siab - cov khoom siv hluav taws xob ntau zaus. Txawm li cas los xij, hauv daim ntawv thov macroscopic, inter-tube tiv thaiv yog qhov ua txhaum uas tua kev ua haujlwm. Kev cia siab rau qhov siab purity, siab nam piv, thiab ua ntej -dispersion technologies ntawm ib qhov chaw tsim tshuaj paus xws li Shandong Tanfeng mus hla qhov conductivity sib txawv los ntawm microscopic mus rau macroscopic yog tib txoj kev rau carbon nanotubes tiag tiag los ua riam phom qhov kawg uas cuam tshuam cov tsoos hlau shielding era.