Qhov sib txawv ntawm electron microscope, atomic force microscope thiab scanning tunneling microscope
ib. Cov yam ntxwv ntawm scanning electron microscope Piv nrog optical microscope thiab kis electron microscope, scanning electron microscope muaj cov yam ntxwv hauv qab no:
(1) Cov qauv saum npoo ntawm cov qauv tuaj yeem pom ncaj qha, thiab qhov loj ntawm cov qauv tuaj yeem loj li 120mm × 80mm × 50mm.
(2) Cov txheej txheem kev npaj ua qauv yog yooj yim thiab tsis tas yuav txiav rau hauv nyias nyias.
(3) Cov qauv tuaj yeem muab txhais thiab tig rau hauv qhov chaw peb sab hauv cov qauv chav, yog li cov qauv tuaj yeem pom los ntawm ntau lub kaum ntse ntse.
(4) Qhov tob ntawm daim teb yog loj, thiab cov duab yog tag nrho ntawm peb-dimensionality. Qhov tob ntawm thaj chaw ntawm lub tshuab ntsuas hluav taws xob ntsuas hluav taws xob yog ntau pua lub sij hawm loj dua li ntawm lub tshuab ntsuas qhov muag thiab kaum ob lub sij hawm loj dua li ntawm kev xa hluav taws xob tshuab hluav taws xob.
(5) Qhov loj ntawm daim duab yog qhov dav thiab qhov kev daws teeb meem yog qhov siab. Nws tuaj yeem nthuav dav kaum zaug mus rau ntau pua txhiab zaus, thiab nws pib suav nrog ntau qhov kev nthuav dav los ntawm cov iav tsom iav, kho qhov muag tsom mus rau kev xa hluav taws xob microscope. Qhov kev daws teeb meem yog nruab nrab ntawm optical microscope thiab kis tau tus mob electron microscope, mus txog 3nm.
(6) Qhov kev puas tsuaj thiab kev kis kab mob ntawm cov qauv los ntawm cov kab hluav taws xob yog qhov me me.
(7) Thaum soj ntsuam cov morphology, lwm cov cim qhia los ntawm cov qauv kuj tuaj yeem siv rau kev tsom xam micro-cov ntsiab lus.
2. Atomic Force Microscope
Atomic Force Microscope (AFM), cov cuab yeej tshuaj ntsuam xyuas uas tuaj yeem siv los kawm txog cov qauv saum npoo ntawm cov khoom siv, suav nrog cov insulators. Nws kawm txog cov qauv saum npoo thiab cov khoom ntawm cov khoom los ntawm kev kuaj xyuas qhov tsis muaj zog ntawm kev sib cuam tshuam ntawm cov qauv ntawm qhov chaw yuav tsum tau sim thiab cov khoom me me ntawm lub zog-rhiab heev. Ib qho kawg ntawm ib khub ntawm microcantilever rhiab rau lub zog tsis muaj zog yog tsau, thiab lub ntsis me me ntawm lwm qhov kawg yog ze rau cov qauv. Lub sijhawm no, nws yuav cuam tshuam nrog nws, thiab lub zog yuav ua rau lub microcantilever deform lossis hloov nws txoj kev txav mus los. Thaum kuaj xyuas tus qauv, siv lub sensor txhawm rau txheeb xyuas cov kev hloov pauv no, thiab cov ntaub ntawv xa tawm quab yuam tuaj yeem tau txais, txhawm rau kom tau txais cov ntaub ntawv saum npoo av thiab cov ntaub ntawv roughness nto nrog nanometer daws teeb meem.
Atomic force microscopy muaj ntau yam zoo dua scanning electron microscopy. Tsis zoo li electron microscopes, uas tsuas yog muab ob-seem dluab, AFMs muab qhov tseeb peb-dimensional maps ntawm qhov chaw. Nyob rau tib lub sijhawm, AFM tsis xav tau kev kho tshwj xeeb ntawm cov qauv, xws li tooj liab plating lossis carbon plating, uas tuaj yeem ua rau cov qauv tsis zoo. Thib peb, electron microscopes yuav tsum tau ua haujlwm nyob rau hauv lub tshuab nqus tsev siab, thaum lub tshuab atomic force microscopes tuaj yeem ua haujlwm zoo nyob rau hauv ib txwm muaj siab thiab txawm nyob rau hauv cov dej ib puag ncig. Qhov no tuaj yeem siv los kawm txog cov macromolecules lom thiab txawm tias cov ntaub so ntswg nyob. Piv nrog rau scanning tunneling microscope (Scanning Tunneling Microscope), atomic force microscope muaj kev siv dav dua vim tias nws tuaj yeem soj ntsuam cov qauv tsis zoo. Lub tshuab ntsuas hluav taws xob ntsuas hluav taws xob, uas tau siv dav hauv kev tshawb fawb thiab kev lag luam, yog ua raws li lub tshuab hluav taws xob atomic force microscope.
3. Scanning tunneling microscope
① Cov kev daws teeb meem siab Scanning tunneling microscope muaj atomic-theem spatial daws teeb meem, nws sab spatial daws teeb meem yog 1, thiab nws txoj kev daws teeb meem ntev yog 0.1.
② Lub tshuab ntsuas tunneling tuaj yeem tshawb xyuas cov qauv saum npoo ntawm cov qauv, thiab tuaj yeem kos duab peb sab.
③ Scanning tunneling microscope tuaj yeem kuaj xyuas cov qauv ntawm cov teeb meem hauv lub tshuab nqus tsev, atmospheric siab, huab cua, thiab txawm tias muaj kev daws teeb meem. Txij li thaum tsis muaj hluav taws xob hluav taws xob hluav taws xob loj, tsis muaj kev puas tsuaj rau saum npoo (xws li hluav taws xob, hluav taws xob puas, thiab lwm yam), yog li nws tuaj yeem kawm txog cov qauv ntawm cov macromolecules lom thiab cov cell membrane nyob hauv lub cev, thiab cov qauv yuav tsis raug puas tsuaj thiab nyob twj ywm.
④ Lub scanning ceev ntawm scanning tunneling microscope yog ceev, lub sij hawm rau tau txais cov ntaub ntawv yog luv, thiab cov duab kuj ceev, yog li nws muaj peev xwm mus nqa tawm dynamic kev tshawb fawb ntawm lub neej txheej txheem.
⑤ Nws tsis xav tau lub lens thiab me me. Qee tus neeg hu nws "pocket microscope".
