Qhov sib txawv tseem ceeb ntawm cov kua dej thermotropic thiab lyotropic kua muaju yog tias cov kua dej thermotropic tsuas muaj mesophase, qhov lyotropic kua muaju tuaj yeem muaj ntau theem.
Cov kua muaj kua muaj peev xwm piav tau raws li lub xeev plaub ntawm cov teeb meem uas tshwm sim ntawm cov khoom thiab cov kua theem ntawm cov teeb meem. Lub xeev ntawm cov teeb meem no sawv cev rau theem nrab ntawm crystalline solids thiab isotropic kua. Tsis tas li ntawd, muaj ob hom loj ntawm cov kua siv lead ua kua; Lawv yog cov thermotropic thiab lyotropic kua crystals.
Dab tsi yog Thermotropic Liquid Crystals?
Thermotropic kua crystals yog cov muaju uas muaj mesophase nyob rau hauv ib qho chaw kub. Thaum cov pob zeb no tau muab tso rau hauv cov hlau nplaum spectrometer, cov molecules ntawm cov muaju zoo li taw qhia rau ib qho kev taw qhia. Cov kev taw qhia yog nyob rau sab nraud magnetic teb los yog nyob rau hauv ib tug perpendicular kev taw qhia rau daim teb.
Cov kua siv lead ua kua no muaj cov molecules me me uas muaj ntau daim ntawv thov ua cov ntaub ntawv, cov ntaub ntawv khaws cia, cov khoom siv kho qhov muag, thiab cov teeb pom kev zoo. Cov ntaub ntawv no feem ntau muaj nematic, smectic thiab cholesteric xeev.
Lyotropic Liquid Crystals yog dab tsi?
Lyotropic kua crystals yog cov ntaub ntawv muaju uas tsim los ntawm kev tawg ntawm amphiphilic mesogen hauv cov kuab tshuaj haum. Ib qho mesogen yog ib yam khoom uas tuaj yeem tso tawm cov khoom siv lead ua kua, thiab peb tuaj yeem piav qhia lawv li cov khoom tsis zoo lossis cov ntaub ntawv ua kua. Txhawm rau tsim cov kua siv lead ua kua lyotropic, nws yuav tsum muaj cov xwm txheej zoo ntawm cov concentration, kub, thiab siab. Ib qho piv txwv niaj hnub ntawm lyotropic kua crystals yog sib tov ntawm xab npum hauv dej.
Txawm li cas los xij, lo lus no tau siv ua ntej los piav txog kev coj tus cwj pwm ntawm cov khoom uas muaj amphiphilic molecules thaum peb ntxiv cov kuab tshuaj rau cov khoom ntawd. Cov ntaub ntawv no muaj ib pab pawg neeg nyiam dej hydrophilic uas yog khi rau cov dej-tiv thaiv hydrophobic pawg.
Thaum xav txog kev tsim cov kua siv lead ua kua lyotropic, nws tshwm sim nrog kev sib cais ntawm microphase ntawm ob yam tsis sib xws (ntawm nanometer scale), uas ua rau tsim cov kuab tshuaj-induced ncua anisotropic kev npaj. Qhov kev tsim no nyob ntawm qhov ntim sib npaug ntawm qhov hydrophobic thiab hydrophilic qhov chaw ntawm cov molecule. Qhov kev sib xyaw ua ke no tuaj yeem ua rau muaj qhov kev txiav txim siab ntev ntawm cov theem uas muaj cov kuab tshuaj molecules uas sau rau hauv qhov chaw nyob ib ncig ntawm cov tebchaw txhawm rau muab cov dej ntws mus rau lub network no.
Qhov txawv ntawm Thermotropic thiab Lyotropic Liquid Crystals yog dab tsi?
Thermotropic thiab lyotropic yog ob hom kua siv lead ua kua. Thermotropic kua muaju yog cov muaju uas muaj mesophase nyob rau hauv qhov kub thiab txias, thaum lyotropic kua crystals yog crystals cov ntaub ntawv uas tsim los ntawm dissolution ntawm amphiphilic mesogen nyob rau hauv ib tug haum hnyav. Qhov sib txawv tseem ceeb ntawm thermotropic thiab lyotropic kua siv lead ua yog tias cov kua dej thermotropic tsuas muaj mesophase, qhov lyotropic kua crystals tuaj yeem muaj ntau theem. Qhov no yog vim hais tias cov concentration ntawm lyotropic kua muaju ua rau lawv induce ntau yam sib txawv theem. Tsis tas li ntawd, lwm qhov sib txawv ntawm cov kua dej thermotropic thiab lyotropic yog cov kua siv lead ua kua thermotropic pom ib theem kev hloov pauv ntawm qhov kub thiab txias thaum lyotropic kua crystals tsis pom ib theem hloov thaum kub hloov.
Cov lus qhia hauv qab no qhia txog qhov sib txawv ntawm cov thermotropic thiab lyotropic kua crystals hauv daim ntawv.
Summary – Thermotropic vs Lyotropic Liquid Crystals
Cov kua muaj kua muaj peev xwm piav tau raws li plaub lub xeev ntawm cov teeb meem uas tshwm sim ntawm cov khoom thiab cov kua theem ntawm cov teeb meem. Muaj ob hom loj: thermotropic thiab lyotropic kua crystals. Qhov sib txawv tseem ceeb ntawm thermotropic thiab lyotropic kua siv lead ua yog tias cov kua dej thermotropic tsuas muaj mesophase thaum lyotropic kua crystals tuaj yeem muaj ntau theem.
