Piv txwv: Ntoj Ntog: Lwm lub npe rau kev txaus siab ntawm cov molecules rau ib leeg yog adhesion - nyob rau hauv cov ntaub ntawv ntawm dej no yog tshwm sim los ntawm hydrogen bonding. … Qhov tshwm sim ntawm cov nyhuv no yog txhawm rau txhawm rau txhawm rau txhawm rau hom elastic zaj duab xis hu ua nto nro.
Puas yog hydrogen bonds adhesion?
Dej muaj peev xwm ua tau zoo ( stick ) rau nws tus kheej thiab lwm yam khoom. Hydrogen bonds tsim thaum hydrogen atoms covalently bonded rau nitrogen (N), oxygen (O), los yog fluorine (F) nyob rau hauv daim ntawv ntawm covalent compounds xws li ammonia (NH 3), dej (H2O) thiab hydrogen fluoride gas (HF).
Puas yog hydrogen bonding adhesion lossis cohesion?
Kev sib koom ua ke tuav cov ntawv cog lus hydrogen ua ke txhawm rau tsim qhov nro ntawm dej. Txij li cov dej tau nyiam mus rau lwm cov molecules, cov nplaum nplaum rub cov dej mus rau lwm cov molecules.
Yuav ua li cas daim ntawv cog lus yog lub luag haujlwm rau adhesion?
Tshuaj adhesion tshwm sim thaum lub npoo atoms ntawm ob qhov chaw sib cais ionic, covalent, lossis hydrogen bonds. Lub hauv paus ntsiab lus engineering tom qab tshuaj adhesion nyob rau hauv qhov kev nkag siab no yog ncaj ncaj: yog tias cov molecules nto tuaj yeem sib txuas, ces cov chaw yuav raug sib koom ua ke los ntawm lub network ntawm cov ntawv cog lus.
Dab tsi yog qhov khoom ntawm adhesion?
Physical Properties
- Adhesion rau ntau yam substrates tso cai rau kev sib txuas ntawm cov khoom sib txawv yog tias tsim nyog.
- High cohesivelub zog yog ntshaw.
- Txhim kho lub zog tev tawm los ntawm flexing nrog tev kev ntxhov siab.
- High elastic modulus ntawm substrate thiab nplaum tiv thaiv kev ntxhov siab ntawm kab ntawv cog lus.
