MADISON University of Wisconsin-Madison engineers tau tsim cov av sensors uas tsis muaj nqi

Shuohao Cai, tus kws kho mob hauv av science, tso lub pas nrig sensor nrog cov ntawv nplaum ntau yam uas tso cai rau kev ntsuas ntawm qhov tob sib txawv rau hauv av ntawm University of Wisconsin-Madison Hancock Agricultural Research Station.
MADISON - University of Wisconsin-Madison engineers tau tsim cov khoom siv hluav taws xob qis uas tuaj yeem muab kev soj ntsuam tas li, lub sijhawm tiag tiag ntawm nitrate hauv Wisconsin hom av. Cov ntawv luam tawm electrochemical sensors tuaj yeem pab cov neeg ua liaj ua teb txiav txim siab txog kev tswj hwm kev noj qab haus huv ntau dua thiab paub txog cov txiaj ntsig kev lag luam.
"Peb cov sensors tuaj yeem ua rau cov neeg ua liaj ua teb nkag siab zoo txog cov zaub mov ntawm lawv cov av thiab cov nitrate muaj rau lawv cov nroj tsuag, pab lawv txiav txim siab ntau npaum li cas cov chiv uas lawv xav tau tiag tiag," said Joseph Andrews, tus pab xibfwb ntawm Harvard University. Txoj kev tshawb no yog coj los ntawm Lub Tsev Kawm Ntawv ntawm Mechanical Engineering ntawm University of Wisconsin-Madison. "Yog tias lawv tuaj yeem txo cov chiv uas lawv yuav, kev txuag nqi yuav yog qhov tseem ceeb rau cov liaj teb loj."
Nitrates yog cov khoom noj tseem ceeb rau kev loj hlob ntawm cov qoob loo, tab sis ntau tshaj nitrates tuaj yeem tawm ntawm cov av thiab nkag mus rau hauv av. Hom kab mob no ua rau muaj kev phom sij rau cov neeg uas haus cov dej tsis huv thiab tsis zoo rau ib puag ncig. Cov kws tshawb fawb 'cov sensor tshiab kuj tseem siv tau los ua cov cuab yeej tshawb fawb txog kev ua liaj ua teb los saib xyuas nitrate leaching thiab pab tsim cov kev coj ua zoo tshaj plaws los txo nws cov teebmeem.
Cov txheej txheem tam sim no rau kev saib xyuas cov av nitrate yog siv zog ua haujlwm, kim, thiab tsis muab cov ntaub ntawv hauv lub sijhawm. Tias yog vim li cas cov kws tshaj lij hluav taws xob luam tawm Andrews thiab nws pab neeg tau teeb tsa los tsim kev daws teeb meem zoo dua, tsis tshua muaj nqi.
Hauv qhov project no, cov kws tshawb fawb tau siv cov txheej txheem luam ntawv inkjet los tsim cov potentiometric sensor, hom nyias-film electrochemical sensor. Potentiometric sensors feem ntau yog siv los ntsuas nitrate hauv cov kua dej kom raug. Txawm li cas los xij, cov sensors no feem ntau tsis haum rau kev siv hauv av ib puag ncig vim tias cov av loj tuaj yeem khawb cov sensors thiab tiv thaiv kev ntsuas kom raug.
Andrews tau hais tias "Qhov kev sib tw tseem ceeb uas peb tau sim daws yog nrhiav txoj hauv kev kom tau txais cov khoom siv hluav taws xob hluav taws xob no kom ua haujlwm tau zoo hauv cov av hnyav thiab xyuas kom raug nitrate ions," said Andrews.
Pab neeg txoj kev daws teeb meem yog muab ib txheej ntawm polyvinylidene fluoride rau ntawm lub sensor. Raws li Andrews, cov khoom no muaj ob yam tseem ceeb. Ua ntej, nws muaj qhov pores me me, txog 400 nanometers loj, uas tso cai rau nitrate ions hla dhau thaum thaiv cov av. Qhov thib ob, nws yog hydrophilic, uas yog, nws nyiam dej thiab nqus nws zoo li daim txhuam cev.
"Yog li cov dej nplua nuj nitrate yuav nyiam nkag mus rau hauv peb cov sensors, uas yog qhov tseem ceeb heev vim tias av kuj zoo li daim txhuam cev thiab koj yuav poob kev sib ntaus sib tua ntawm cov dej noo nkag mus rau hauv lub sensor yog tias koj tsis tuaj yeem tau txais tib qhov nqus dej. Av muaj peev xwm," Andrews hais. "Cov khoom ntawm polyvinylidene fluoride txheej no tso cai rau peb kom tshem tawm nitrate-nplua nuj dej, xa mus rau lub sensor nto thiab xyuas kom raug nitrate."
Cov kws tshawb fawb tau piav qhia txog lawv qhov kev nce qib hauv ib daim ntawv luam tawm thaum Lub Peb Hlis 2024 hauv phau ntawv xov xwm Advanced Materials Technology.
Pab neeg no tau sim lawv qhov ntsuas ntawm ob hom av sib txawv uas cuam tshuam nrog Wisconsin-cov av xuab zeb, feem ntau nyob rau sab qaum teb-nruab nrab ntawm lub xeev, thiab silty loams, feem ntau nyob rau sab hnub poob Wisconsin-thiab pom tias cov sensors tsim cov txiaj ntsig raug.
Cov kws tshawb fawb tam sim no tau koom ua ke lawv cov nitrate sensor rau hauv ntau lub tshuab sensor lawv hu ua "sensor sticker," uas peb hom sensors tau nruab rau ntawm cov yas hloov tau yooj yim siv cov nplaum nplaum. Cov ntawv nplaum kuj muaj cov av noo thiab kub sensors.
Cov kws tshawb fawb yuav txuas ntau cov ntawv nplaum rau hauv ib qho kev tshaj tawm, muab tso rau ntawm qhov siab sib txawv, thiab tom qab ntawd faus tus ncej hauv av. Qhov kev teeb tsa no tso cai rau lawv los ntsuas qhov sib txawv ntawm cov av tob.
"Los ntawm kev ntsuas nitrate, noo noo thiab kub ntawm qhov tob sib txawv, tam sim no peb tuaj yeem ntsuas cov txheej txheem nitrate leaching thiab nkag siab tias nitrate txav mus los hauv av, uas tsis tuaj yeem ua tau ua ntej," Andrews hais.
Nyob rau lub caij ntuj sov xyoo 2024, cov kws tshawb fawb npaj yuav tso 30 tus pas ntsuas hluav taws xob hauv av ntawm Hancock Agricultural Research Station thiab Arlington Agricultural Research Station ntawm University of Wisconsin-Madison txhawm rau ntsuas qhov ntsuas ntxiv.