Barium sulfate tsim cov xim dawb tshaj plaws hauv ntiaj teb

Xiulin Ruan, tus xibfwb ntawm Purdue University ntawm mechanical engineering, thiab nws cov tub ntxhais kawm tau tsim cov xim dawb tshaj plaws hauv cov ntaub ntawv.

 

Xib fwb Xiulin Ruan ntawm Mechanical Engineering ntawm Purdue University thiab nws cov tub ntxhais kawm ib zaug tau tsim cov xim dawb tshaj plaws uas tau sau tseg, uas tam sim no tau suav nrog hauv Guinness Book of World Records. Cov xim dawb no tuaj yeem cuam tshuam txog li 98.1% ntawm lub teeb pom kev, thiab vim tias nws muaj kev cuam tshuam zoo, nws tuaj yeem tawm hluav taws xob hluav taws xob los ntawm cov xim pleev xim rau saum npoo, thiab muaj cov hluav taws xob ua kom txias txias.

 

Xiulin Ruan tuav nws lub lab tus qauv ntawm cov xim dawb tshaj plaws ntawm cov ntaub ntawv

 

Dawb yog xim uas muaj tag nrho cov xim hauv cov spectrum. Nws yog cov xim uas muaj qhov ci ntsa iab tshaj plaws uas peb tau ntsib hauv peb lub neej txhua hnub, thiab nws kuj yog xim tshwj xeeb. Nws tsis tuaj yeem sib xyaw nrog lwm cov xim. Nws yog qhov kim tshaj plaws thiab nyiam nyob hauv lub thawv xim ntawm cov tub ntxhais kawm kos duab. Nws kuj yog ib qho kim heev ntawm cov tshuaj pleev xim tsheb thiab cov txheej txheem kev lag luam.

 

Muaj ntau qhov laj thawj rau kev tsa "tus nqi" ntawm cov dawb. Siv cov xim dawb uas feem ntau siv hauv kev lag luam ua piv txwv. Piv nrog rau lwm cov xim, nws cov xim yog pom tseeb cuam tshuam los ntawm impurities, yog li nws cov txheej txheem purification yuav nyuaj dua. Nyob rau tib lub sijhawm, cov xim dawb yog yooj yim oxidized thiab tig daj. Cov ntaub ntawv zoo li cas los xaiv thiab yuav ua li cas kom ruaj khov nws cov matrix kuj yog kev nyuaj.

 

Nyob rau hauv luv luv, lub whiter xim, qhov nyuaj nws yog ua. Tab sis cov kws tshawb fawb yeej tsis tau tso tseg txoj kev nrhiav qhov kawg, ib yam li tib neeg tau tsim cov xim dub tshaj plaws "Vanta Black", uas tuaj yeem nqus tau 99.9% ntawm lub teeb pom kev. Nyob rau hauv sib piv, muaj ib tug txiv neej uas yog tseem obsessed mus nrhiav qhov kawg dawb. Tom qab ntau tshaj li rau xyoo ntawm kev ua haujlwm hnyav los ntawm nws thiab nws pab neeg, nws thaum kawg tau ua nws tsis ntev los no. Nws yog xibfwb Ruan Xiulin los ntawm Purdue University hauv Tebchaws Meskas. Tsis ntev los no, nws tau coj nws pab neeg los tsim cov xim dawb tshaj plaws hauv tib neeg keeb kwm. Cov xim no ultra-dawb tuaj yeem cuam tshuam txog li 98.1% ntawm lub teeb pom kev, thaum tseem emitting infrared tshav kub los ntawm cov xim pleev xim rau saum npoo, thiab muaj hluav taws xob ua haujlwm txias txias.

 

Lub koob yees duab infrared qhia tau hais tias ib qho piv txwv ntawm cov xim dawb tshaj plaws (qhov tsaus liab liab square nyob rau hauv nruab nrab) ua rau lub rooj tsavxwm hauv qab qhov kub thiab txias, ib yam dab tsi uas tsis yog kev lag luam "tshem tawm" xim ua.

 

Txij li thaum koom nrog Purdue University hauv 2008, xibfwb Xiulin Ruan tau cog lus rau kev tshawb fawb hauv lub zog thiab thermophysics engineering. Tom qab tsis ntev los no tau tshaj tawm cov txiaj ntsig kev tshawb fawb ntawm cov xim dawb super, nws lees txais kev xam phaj los ntawm ntau cov xov xwm thiab tham txog yuav ua li cas yog tias cov xim no siv rau li 1,000 square inches ntawm lub ru tsev, sab hauv tsev tuaj yeem tau txais 10 kilowatts ntawm cua txias zog, txawm tias txias dua ntau lub tsev nrog lub hauv paus cua txias.

 

Ua ntej qhov no, nws yog qhov nyuaj heev kom ua tau zoo passive (radiative) txias. Tam sim no, ib qho kev daws teeb meem zoo heev yog siv cov txheej txheem ntau txheej txheej lossis cov txheej txheem hlau, tab sis qhov no txwv lawv daim ntawv thov hauv ntau qhov chaw. Ib qho ntxiv yog kom ua tiav qhov txias txias los ntawm cov xim, tab sis qhov kev xav ntawm cov xim dawb feem ntau siv tam sim no tseem nyob hauv thaj tsam ntawm 80%-90%, thiab qhov tsis tshua muaj kev cuam tshuam ua rau nws nyuaj rau qhov chaw txias. Qhov no yuav tsum tau pleev xim ib txheej tuab heev ntawm cov xim, uas tsis yog tsuas yog khib nyiab xwb tab sis kuj yooj yim heev rau tawv, thiab nws daim ntawv thov ntau yog nqaim thiab tuaj yeem ua haujlwm tsuas yog hauv qee qhov huab cua tshwj xeeb.

 

Txhawm rau daws qhov teeb meem no, pab pawg tshawb fawb tau tsim cov calcium carbonate-raws li txheej dawb nrog kev xav ntawm 95.5%. Tam sim no, tus tshiab nanocomposite ultra-dawb txheej raws li barium sulfate lawv tsim tau undoubtedly txhawb txoj kev loj hlob ntawm passive txias tshuab mus rau ib tug ntau dua. Lawv daim ntawv tau luam tawm raws li ib tsab xov xwm nyob rau hauv phau ntawv journal "American Chemical Society Applied Materials & Interfaces".

 

"Whitening" secrets

Qhov no super-dawb xim muaj ob lub ntsej muag dawb "tsis pub leejtwg paub". Ib qho yog qhov siab ntawm barium sulfate ntxiv rau cov xim matrix. Qhov sib xyaw no muaj qhov sib txawv ntawm cov khoom siv hluav taws xob siab, kev nqus hnub ci tsawg thiab muaj kev cuam tshuam siab. Nws feem ntau yog siv los ua ib qho muab tub lim los hloov qhov sib xws thiab ntxiv rau qee cov xim dawb. Nws kuj tseem siv tau los ua tus neeg sawv cev dawb thiab ntxiv rau daim ntawv duab thiab tshuaj pleev ib ce.

Cov kws tshawb fawb tau sim ntau yam khoom dawb ntawm kev ua lag luam thiab pom tias ntxiv barium sulfate tuaj yeem ua rau muaj txiaj ntsig zoo ntawm cov khoom, uas yog, nws yuav ua rau nws zoo dua; Qhov thib ob yog tias cov khoom barium sulfate hauv cov xim muaj ntau qhov sib txawv thiab muaj qhov sib txawv ntawm qhov loj me me. Qhov degree uas txhua qhov tawg ntawm lub teeb hloov pauv nrog nws qhov loj me, yog li qhov loj dua qhov loj me me ntawm qhov sib faib ntawm cov khoom hauv cov xim, qhov pom pom ntau dua cov xim tuaj yeem tawg.

Cov nyhuv superposition ntawm ob "tsis pub lwm tus paub" ntawm qhov siab thiab qhov sib txawv ntawm qhov sib txawv ua rau cov xim tshiab no muaj qhov cuam tshuam loj heev. Tau kawg, qhov concentration ntawm barium sulfate tsis tuaj yeem siab dhau. Txawm hais tias muaj siab concentration pab ua kom cov xim dawb, qhov siab heev kuj yuav ua rau cov xim ntau dua tuaj yeem tawg lossis tev tom qab ziab, cuam tshuam rau cov neeg siv kev paub.

 

Hloov lub tshuab cua txias

Raws li peb txhua tus paub, lub teeb dawb yog lub teeb xim nyuaj, thiab cov khoom opaque yuav nqus cov xim sib txawv ntawm lub teeb thiab xav txog tib xim ntawm lub teeb, yog li cov khoom dawb muaj qhov cuam tshuam ntau dua. Thaum cov xim dawb yog siv los pleev xim rau lub ru tsev, nws tuaj yeem cuam tshuam lub hnub ci ntsa iab tshav kub mus rau qhov loj, txo cov hluav taws xob hloov hluav taws xob thiab kev hloov hluav taws xob.

Raws li kev tshawb fawb hauv Geophysical Research Letters hauv 2010, yog tias lub ru tsev ntawm cov tsev nyob hauv lub nroog tau pleev xim rau cov xim dawb zoo nkauj, lub computer simulation pom tias qhov no tuaj yeem txo qhov kub ntawm cov kob los ntawm 33%, txo tag nrho. Qhov kub ntawm lub nroog los ntawm 0.4 degree, thiab txo qhov kub ntawm sab hauv tsev, yog li txo qhov kev siv ntawm cov cua txias thiab ua kom tiav lub hom phiaj ntawm kev txuag hluav taws xob thiab emission txo.

 

Microstructure ntawm barium sulfate-acrylic acid composite txheej nrog lub ntim concentration ntawm 60%

 

Qhov kev xav ntawm cov xim tsim los ntawm Purdue University yog ntau dua li cov xim lag luam zoo tib yam, uas txhais tau hais tias nws muaj qhov ua kom txias dua. Cov kws tshawb fawb tau siv lub thermocouple high-precision ntsuas ntsuas ntsuas ntsuas qhov ntsuas cua txias ntawm cov xim sab nraum zoov. Hauv kev sim ua qauv qhia, cov xim no tuaj yeem siv rau ntau qhov chaw. Thaum tsaus ntuj, nws tuaj yeem ua rau cov xim pleev xim rau 11 degree qis dua qhov ntsuas kub ib puag ncig, thiab nyob rau hauv tshav ntuj muaj zog thaum tav su, nws tuaj yeem ua kom txias ntawm qhov chaw mus rau 5 degree qis dua qhov chaw ib puag ncig. Hauv kev sim ntxiv, cov kws tshawb fawb pom tau tias txawm tias nyob rau hauv qhov chaw txias ntawm lub caij ntuj no (qhov ntsuas kub yog li 6 degree), nws tseem tuaj yeem txo qhov saum npoo ntawm cov qauv los ntawm 10 degree, uas ua pov thawj tias cov xim muaj qhov ua tau zoo ntawm kev ua kom txias txias.

 

Purdue University cov kws tshawb fawb Xiulin Ruan thiab Joseph Peoples siv lub koob yees duab infrared los sib piv cov kev ua haujlwm txias ntawm cov qauv xim dawb ntawm lub ru tsev.

 

Qhov tseeb, hom tshiab ntawm cov xim dawb dawb no yog los ntawm kev xav ntawm pab pawg tshawb fawb. Lawv Ameslikas xav siv cov xim dawb dawb los hloov cov tshuab cua txias rau tsev txias. Tom qab ntawd, lawv tau ua ntau yam kev txhim kho raws li cov hluav taws xob txias xim tsim nyob rau xyoo 1970s, thiab tau ua ntau tshaj li rau xyoo ntawm kev tshawb fawb thiab kev sim. Rau kev xaiv cov khoom siv ntawm cov xim, lawv pib xav txog ntau tshaj 100 cov khoom sib txawv. Tom qab ntau qhov kev sim, lawv maj mam txo qis mus rau 10. Tom qab ntawd, lawv tau ua qhov kev sim hla ntawm 50 tus qauv sib txawv rau txhua 10 pawg ntawm cov ntaub ntawv no.

 

Lawv pib tau cov xim dawb calcium carbonate, tab sis calcium carbonate yuav hnov ​​​​mob hauv huab cua huab cua xws li cov kua qaub los nag thiab ua rau cov xim tsis zoo, yog li lawv tau tsim cov xim pleev xim rau barium sulfate, thiab tshwj xeeb optimized stability ntawm cov xim rau complex. sab nraum zoov ib puag ncig, thiab thaum kawg xaiv ib qho barium sulfate-acrylic acid composite xim mis nrog lub ntim concentration ntawm 60%. Qhov no kuj qhia tau tias calcium carbonate tsis zoo li barium sulfate hauv acid thiab alkali tsis kam.

 

Xib fwb Xiulin Ruan tau hais tias hom xim tshiab uas lawv tau tsim muaj zoo dua rau lwm cov xim dawb coj mus muag tam sim no siv los ntawm kev cuam tshuam, kev ua haujlwm txias thiab ruaj khov. Nyob rau tib lub sijhawm, nws cov txheej txheem tsim khoom yog sib xws nrog cov txheej txheem ua lag luam xim zoo nkauj thiab tus nqi tswj tau. Yog li ntawd, cov xim no muaj cov ntawv thov dav dav hauv kev txo cov nqi cua txias, tiv thaiv kev cuam tshuam hauv nroog cov kob, thiab txo qhov kev sov siab thoob ntiaj teb yav tom ntej. Hauv kev xam phaj nrog BBC, nws kuj tau hais tias: "Peb tau suav cov lus ntxhib heev uas tsuas yog 1% ntawm lub ntiaj teb saum npoo av (tej zaum qee pob zeb hauv thaj chaw tsis muaj neeg nyob) yuav tsum tau coated nrog cov xim no los ua lub luag haujlwm hauv kev tawm tsam kev hloov pauv huab cua. ib qho twg."

 

Them mloog mus rau precipitated barium sulfate ntawm Yunfu Hongzhi Tshiab Khoom Co., Ltd.

Yunfu Hongzhi Tshiab Khoom Co., Ltd. muaj peev xwm tsim ntau yam precipitated barium sulfate khoom nrog ib tug nruab nrab particle loj ntawm 30 nanometers rau 10 microns, tsom rau kev muab cov khoom customized thiab cov kev pab cuam. Nws yog tsim nyog hais tias peb tuaj yeem ua qhov sib txawv ntawm kev kho mob ntawm cov khoom raws li cov neeg siv khoom xav tau.

 

Raws li kev tshawb fawb ntawm xib fwb Xiulin Ruan pab neeg, barium sulfate tsim cov xim dawb tshaj plaws nyob rau hauv lub ntiaj teb no, uas qhia tau hais tias precipitated barium sulfate ntawm Yunfu Hongzhi Tshiab Materials Co., Ltd. plays lub luag hauj lwm tseem ceeb raws li ib tug functional additive nyob rau hauv daim ntawv thov txheej. Barium sulfate muaj siab dawb thiab acid thiab alkali tsis kam. Nws yog tsim los ntawm kev sib txuas cov hmoov sib txawv ntawm qhov ntau thiab tsawg, uas tuaj yeem ua rau cov txheej txheem muaj qhov dav tshaj plaws spectral tawg thiab pab kom tau txais qhov siab tshaj plaws reflectivity. Nws yog hu ua tshav kub reflective txheej.

 

Yunfu Hongzhi New Materials Co., Ltd. engineers kuj tau hais tias los ntawm kev ntxiv cov ntsiab lus siab ntawm barium sulfate thiab kev sib xyaw ua ke ntawm qhov sib txawv ntawm qhov ntau thiab tsawg ntawm barium sulfate los txo qhov sib txawv ntawm cov khoom thiab txhim kho kev xav, ntau ntxiv tuaj yeem ntxiv vim cov roj nqus cov nqi qis. ntawm barium sulfate. Peb precipitated barium sulfate muaj ib tug nqaim particle loj tis thiab ntau yam hais. Cov nyhuv yuav zoo dua los ntawm kev sib xyaw ntawm cov khoom sib txawv. Peb Ultra Dawb Barium Sulfate yog nrov heev nyob rau hauv coatings uas yuav tsum tau siab gloss, thiab Extinction Barium Sulfate kuj muaj nws cov yam ntxwv tshwj xeeb hauv matte thiab semi-matte txheej.

 

 

Xibfwb Xiulin Ruan pab pawg tau ua tiav cov txiaj ntsig zoo tsis yog hauv cov txheej txheem vaj tsev xwb, tab sis kuj tseem muaj xim pleev xim rau tsheb, dav hlau thiab dav hlau. Barium sulfate tuaj yeem ua kom cov ntsiab lus ruaj khov thiab txo VOC, uas tuaj yeem pab txo qis kev siv cua txias, thiab txij li cov tshuab cua txias no siv roj, nws tseem tuaj yeem pab txuag roj av. Nyob rau hauv daim ntawv thov txheej, ntxiv precipitated barium sulfate, cov khoom siv, tuaj yeem tiv thaiv lub ntiaj teb sov los ntawm kev ua kom lub ntsej muag txias txaus kom txo tau qhov xav tau ntawm cov cua txias.