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Kev tsim thiab kev faib tawm ntawm cov kua qaub kua

Sep 25, 2017

Feem ntau peb ntseeg tias cov khoom muaj peb lub cev: khoom, kua, thiab roj. Qhov tseeb, qhov no tsuas yog rau cov dej, muaj qee cov organic sib txuas thiab cov khoom, thiab lub xeev ntawm cov khoom thiab kua kas yog kua crystalline xeev (Raws li qhia hauv daim duab 1 )

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Los ntawm cov muaj pes tsawg leeg thiab lub cev nqaij daim tawv cov kua qaub, cov kua pleev yuav muab faib ua ob pawg: thermotropic kua muaju thiab kua lyotropic kua Crystals:

Cov kua muaj kua thermotropic: cua sov cua sov los ntawm cua kub lawv thiab cua kub lawv los rhuav tshem cov kua pleev ua los ntawm cov kua siv ua kua ua kua.

Lyotropic kua Crystals: cov kua pleev ua kua uas muaj cov organic compounds txuas rau hauv ib qho hnyav thiab muab los ntawm qhov hnyav.

Kev siv cov kua dej ua kua yog cov thermotropic kua siv lead ua, muaj cov kua dej ua kua lyotropic nyob rau hauv lub nruab nrog cev, muaj ze li ntawm 10000 hom kua siv lead ua kua hauv cov khoom siv, cov khoom siv ua kua, feem ntau elongated lossis flattened, thiab kev sib txawv ntawm txhua theem ntawm cov kua dej ua kua .

Muaj peb hom kua crystalline hauv cov kua ua kua (cov thermotropic kua crystals) nrog qws molecules (Raws li qhia hauv daim duab 2)

Ntshav kua muaj kua

Nematic kua muaju

Cholesteric kua muaju

Cov kua tshuaj pleev ua kua molecules muaj ob txoj kev txiav txim siab, thiab cov molecules raug teem rau hauv txheej. Lub siab tawv thiab qhov nro ntawm cov kua nplaum yog cov loj, uas yog qhov kev tsis sib thooj hauv cov hluav taws xob sab nrauv, qhov sib txawv thiab qhov kub.

Ib lub qhov cub ua kua tshuaj nematic ua kua dej, nws yuav ua tau rau sab laug, ua ntej thiab tom qab kev sib txeeb, molecular orientation thiab kev ywj pheej ywj siab, muaj ntau dua rau sab nraud magnetic teb, kub, kev nyuab siab, cov khoom yog lub ntsiab ntawm tam sim no.

Cholesteric kua muaju zoo li cov kua nplaum ua kua, tab sis los ntawm Z axis, nws pom tau tias lawv qhov kev taw qhia txawv nrog cov khaubncaws sab nraud povtseg, thiab ib qho chaw ua haujlwm hluavtaws thiab qhov chaw nqos dej ua rau nws ua kua qaub nematic.

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