Cov xim tsheb tshiab tuaj yeem hloov cov cua txias

Cov xim tshiab tsim los ntawm cov kws tshawb fawb tuaj yeem ua rau lub tsheb sab hauv txias dua txawm tias raug kub hnyiab. Cov xim hais tias kuj tuaj yeem siv rau hauv tsev lossis tsev.

Tsis xav tau lub tsheb, txawm tias thaum nws yog 100-degree cua sov, yuav yog ib lub tswv yim zoo, thiab thaum nws suab tsis yooj yim sua, nws tuaj yeem yog qhov tseeb. Cov qauv xim tshiab uas tau tsim tshiab tuaj yeem pab ua kom cov tsev thiab cov tsheb tsawg dua nyob ntawm cov cua txias..

Purdue University engineers tau tsim cov xim hloov pauv. Qhov no yog qhov dawb tshaj plaws uas tau ua. Tam sim no cov kws tshawb fawb hais tias kev siv cov xim no rau cov tsheb lossis cov tsev yuav txo tau cov cua txias.

Ultra-dawb xim mis ua kom txhua yam nws tau pleev xim rau ntawm qhov txias dua

Purdue's ultra-dawb xim mis ua kom txhua yam xim tshiab. "Yog tias koj yuav tsum siv cov xim no rau ntawm lub ru tsev uas muaj thaj tsam li 1,000 square feet, peb kwv yees tias koj tuaj yeem tau txais 10 kilowatts ntawm lub peev xwm txias," Xiuling Ruan, tus xibfwb ntawm mechanical engineering ntawm Purdue, hais rau Scitechdaily. Nws tau sau tseg tias "Qhov no muaj zog dua li cov tshuab cua txias hauv nruab nrab siv hauv tsev feem ntau," nws sau tseg.

Tej zaum koj yuav nco ntsoov Vantablack, cov xim dub uas absorbs 99% ntawm lub teeb pom. Zoo, cov xim dawb no yog qhov txawv ntawm Vantablack. Qhov ntawd yog, nws qhia txog 98.1% ntawm lub hnub rays.

Nws siv rau xyoo ntawm kev tshawb fawb los nrhiav cov xim dawb tshaj plaws. Tiag tiag, keeb kwm los ntawm kev tshawb fawb tau ua nyob rau xyoo 1970s.. Lub sijhawm ntawd, kev tshawb fawb tab tom tsim los tsim cov xim hluav taws xob cua txias.

Ua li cas nws ua hauj lwm?

Infrared cua sov khiav tawm ntawm txhua yam uas yog xim dawb. Qhov no yog qhov ua tiav ntawm cov tshuaj tiv thaiv ntawm cov xim dawb. Nws tau sov dua es tsis txhob txias dua tshwj tsis yog tias nws tau tsim tshwj xeeb kom dissipate cua sov.

Qhov tshwj xeeb tsim cov xim dawb no tsuas yog qhia txog 80-90% ntawm tshav ntuj. Thiab nws tsis txias qhov chaw uas nws tau kos. Qhov no kuj txhais tau tias nws tsis txias dab tsi nyob ib puag ncig hom xim no.

Yog li dab tsi ua rau qhov no whitest dawb li extraordinarily dawb? Nws yog barium sulfate uas ua rau nws cov khoom cua txias. Barium sulfate kuj tseem siv los tsim cov ntawv thaij duab, thiab yog dab tsi ua rau qee cov tshuaj pleev ib ce dawb.

Kev siv barium sulfate ua rau cov khoom muaj kev cuam tshuam ntau dua

Xiangyu Li, Ph.D. ntawm Purdue hais tias "Peb tau saib ntau yam khoom lag luam, qhov tseem ceeb yog txhua yam uas yog dawb," said Xiangyu Li, Ph.D. tub ntxhais kawm hauv Rouen's Laboratory. "Peb pom tias los ntawm kev siv barium sulfate, koj tuaj yeem theoretically ua tej yam muaj kev cuam tshuam heev. Qhov no txhais tau tias lawv yog cov dawb heev, "nws hais.

Lwm qhov laj thawj vim li cas cov xim dawb yog qhov cuam tshuam yog vim hais tias barium sulfate muaj ntau qhov sib txawv. Cov khoom loj ntawm barium sulfate tawg lub teeb zoo dua. Yog li ntawd, qhov sib txawv particle qhov ntau thiab tsawg pab txhawm rau txhawm rau txhawm rau lub hnub ci spectrum ntxiv.

Qhov concentration ntawm cov khoom nyob rau hauv cov xim yog qhov zoo tshaj plaws los ua kom dawb thiaj li reflective. Tab sis qhov tsis zoo yog qhov ntau dua ntawm cov khoom ua kom yooj yim rau tev tawm cov xim. Yog li, los ntawm cov tswv yim pom zoo, ua cov xim dawb tsis zoo tshwj xeeb.

Cov xim tau pom nyob rau hauv cov xim txias. Thaum tsaus ntuj, cov xim ua kom qhov chaw 19 degrees txias dua li lwm yam uas nyob ib puag ncig cov khoom pleev xim. Nyob rau hauv tej yam kev mob ntawm huab cua kub, nws cools nto 8 degrees qis dua cov khoom nyob ib puag ncig.

Peb xav paub ntau npaum li cas qhov kub thiab txias tuaj yeem txo nrog kev sim ntau dua. Yog tias cov kev sim no nrog cov xim dawb tuaj yeem txo qhov kub thiab txias ntxiv, lub tshuab cua txias yuav dhau los lawm. Los yog tsawg kawg txo qhov yuav tsum tau qhib cua hauv lub tsheb lossis hauv tsev.

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