Doping polymer txhuam nrog cov nanoparticles kub tau nyob hauv ib qho kev sib hloov uas hloov nws cov thickness nyob ntawm tus pH. Kev tshawb fawb los ntawm physicists ntawm Darmstadt University of Technology hauv phau ntawv Mos Liab yuav siv los tsim cov tshuaj nanosensors rau kev tshuaj ntsuam lossis kev ntsuam xyuas ib puag ncig.
Polymer txhuam yog cov tshuab chaav hlau uas muaj densely grafted rau ntawm qhov chaw. Vim lub zog ntawm electrostatic, cov saw txuas ntawm qhov chaw thiab cov ntaub ntawv zoo li cov plaub hau uas muaj lub thickness ntawm ntau pua nanometers. Tam sim no, cov kev tshawb fawb tau teem rau kev tsim cov qauv ntawm polymer uas teb rau ntau hom kev hnov mob xws li pH, qhov kub los yog cov roj biomarkers. Cov kws kho mob ntawm TU Darmstadt thiab TU Berlin tau qhia thawj zaug txog seb lub thickness ntawm polymer txhuam yuav raug hloov los ntawm kev sib txuas cov pH-rhiab kub nanoparticles.
"Ua ke ntawm polymer chains thiab kub nanoparticles yog pheej, tshwj xeeb tshaj yog nyob rau hauv kev ntsuam xyuas mob los yog ib puag ncig tsom," Dikran Boyaciyan said. Tus tub ntxhais kawm 30 xyoo ua haujlwm hauv "Interfacial Soft Matter" pab pawg los ntawm Professor Regin von Kleinzin.
"Qhov kev siv tshuab no tseem nyob rau theem pib ntawm txoj kev loj hlob, thiab lub hom phiaj tseem ceeb yog qhov kev sib cuam tshuam ntawm txoj kab nruab nrab ntawm polymer thiab cov nanoparticles tuaj yeem kho thiab txhim kho hauv cheeb tsam tswj hwm," Boyaciyan piav qhia. Cov khoom ntse ntse polymer siv tau los qhia txog cov tshuaj nanosensors rau tej co toxins lossis cov kabmob kheesxaws, saib xyuas cov kabmob lossis cov hom tshuaj tso rau hauv tib neeg lub cev.
Boyaciyan kuaj ob hom pH-insensitive polymers rau nws siv ntev li ib qho sensor: non-ionic PNIPAM thiab cationic PMETAC. Tus qub yog xam tias tsis tsim nyog vim hais tias cov hmoov kub ntxuav tawm ntawm qhov txhuam ntawm cov pH siab. Txawm li cas los xij, hauv cov ntaub ntawv PMETAC txhuam, cov khoom kub tsis cuam tshuam los ntawm kev hloov pH.
Ntxiv mus, Boyaciyan tau ua li cas los npaj kev hloov pH hloov ntawm PMETAC los ntawm kev siv cov kub nanoparticles thiab seb lawv ua haujlwm li cas. Hauv ib cheeb tsam acidic, cov khoom ua tsis tau nqi thiab kev sib tsoo kev sib tsoo thiab kev sib tsoo txoj kev sib tsoo. Qhov no ua rau txhuam kom swell vim tias nws cov saw tau tsawg dua.
Hauv kev sib piv, ib qho chaw alkaline tsim ib qho tsis raug nqi ntawm cov khoom thiab kev sib txuam nrog kev txhuam zoo uas raug txhim kho dua. Lub voj voog ntawm cov saw ua rau txhuam txheej ua thinner.
Txij li cov thickness variation tseem muaj feem xyuam rau spectral nyob ntawm lub teeb pom kev zoo, cov khoom yuav siv tau raws li ib tug colorimetric nanosensor. Vim nws me me loj me, nws yuav tsum tau txuas rau microlasers thiab spectrometers, uas yav tom ntej siv tau rau hauv chip systems thiab txawm nyob hauv tib neeg lub hlwb.
