Cov kua dej ua haujlwm yog chav ua kua uas tau ua tiav nrog kev siv lub cev, tshuaj lom neeg lossis cov qauv tsim tshwj xeeb. Lawv muaj kev siv thoob ntiaj teb hauv kev lag luam, tshuaj, lub zog, thiab lwm thaj teb. Lawv qhov kev ua tau nyob ntawm tsis yog rau ntawm lub cev nqaij thiab tshuaj lom neeg ntawm cov kua dej ntawm lub hauv paus tab sis tseem nyob rau ntawm cov khoom sib ntxiv ntawm cov neeg sib ntxiv, uas ua rau lawv pom kom tau cov xwm txheej zoo tshaj plaws hauv cov xwm txheej tshwj xeeb.
Los ntawm ib tug rheological lub tswv yim, lub viscosity ntawm cov kua dej ua tau zoo tuaj yeem hloov kho nrog qhov kub, siab, lossis tus nqi shear. Piv txwv li, cov kua hlau nplaum ntawm cov dej muaj txiaj ntsig hauv viscosity nyob rau hauv cov cawv thiab yog siv hauv cov dampers lossis precision braking tshuab. Shear - thinning tsis-} Cov kua dej ntau dua- ruaj ruaj tshuab. Nyob rau hauv cov nqe lus ntawm thermodynamic zog, theem hloov pauv (xws li paraffin {}}} kev hloov pauv thiab siv dav hauv cov khoom siv hluav taws xob.
Tshuaj lom neeg ua haujlwm yog lwm tus yam ntxwv tseem ceeb. Kev ua kua catalytic ua raws li kev ua kom muaj kev cuam tshuam zoo tom qab kev puas tsuaj ntawm cov neeg sawv cev los ntawm kev kho kom zoo los ntawm kev ua kom zoo nkauj los ntawm kev ua kom zoo nkauj los yog kev sib tsoo micro dupture. Biocompe kua (xws li saline daws teeb meem muaj cov surfactants tshwj xeeb) ua lub luag haujlwm tseem ceeb hauv kev xa tshuaj thiab cov ntaub so ntswg ua haujlwm.
Tsis tas li ntawd, qhov kev ruaj ntseg ntawm cov kua ua haujlwm ncaj qha cuam tshuam rau lawv lifespan. Kev haus dej hauv tshuab hluav taws xob yuav tsum muaj kev cia siab rau cov kua dej, thaum cov tshuaj tiv thaiv dej tawm ntawm kev sib ntxiv ntawm cov dej khov ua kom haum. Nyob rau yav tom ntej, nrog kev sib hloov ntawm Nanotechnology thiab kev txawj ntse ntawm cov kua ua haujlwm tau meej pem, kev tsav tsheb kom muaj kev tsav tsheb ntse thiab cov ntaub ntawv ib puag ncig.
