Silica gel yog nyob deb ntawm kev siv ntau tshaj adsorbent thiab tseem yog theem tseem ceeb nyob ruaj khov rau TLC. … Qhov saum npoo ntawm silica gel nrog qhov siab tshaj plaws ntawm geminal thiab txuam nrog silanols yog nyiam tshaj plaws rau cov chromatography ntawm cov ntsiab lus yooj yim vim tias cov silanols tsis tshua muaj acidic.
Vim li cas silica gel siv hauv chromatography?
Nws yog a polar absorbent nrog me ntsis acidity, ua kom nws nqus cov ntsiab lus hauv cov khoom uas xav tau kev sib cais thaum lub sijhawm chromatography, thaum tseem nyob nruab nrab thiab tswj nws tus kheej cov qauv thoob plaws hauv lub cev. txheej txheem.
Lub luag haujlwm ntawm silica gel hauv nyias txheej chromatography TLC yog dab tsi?
Cov silica gel siv los ua cov txheej nyias ntawm cov hlau nyob ruaj ruaj yog qhov zoo tshaj plaws adsorbent… Qhov saum npoo ntawm silicon dioxide compound qauv yog polar vim yog Si-O-H bonds. Vim qhov polarity no, cov kuab tshuaj molecules tuaj yeem tsim kev sib txuas los ntawm hydrogen bonds lossis dipole-dipole kev sib cuam tshuam.
silica gel ua haujlwm TLC li cas?
Cov silica gel ntawm TLC phaj yog impregnated nrog cov khoom siv fluorescent uas glows nyob rau hauv ultraviolet (UV) lub teebIb qho chaw yuav cuam tshuam nrog cov fluorescence thiab tshwm raws li qhov chaw tsaus ntawm ib tug glowing keeb kwm yav dhau. Thaum nyob hauv qab lub teeb UV, cov pob tuaj yeem sau nrog xaum los cim lawv qhov chaw.
Dab tsi ua rau cov silica siv nyob rau hauv TLC ib tug polar nyob ruaj ruaj theem?
Silica gel, feem ntau siv nyob ruaj khov theem, muaj cov mis mos SiO2. Txawm li cas los xij, ntawm qhov chaw ntawm silica gel hais, cov dangling oxygen atoms raug khi rau protons. Lub xub ntiag ntawm cov pab pawg hydroxyl ua rau saum npoo ntawm silica gel heev polar.
