2024 Tus sau: Luke Adderiy | [email protected]. Kawg hloov kho: 2024-01-10 19:34
Ib lub tshuab ntsuas hluav taws xob ntsuas hluav taws xob yog hom hluav taws xob lub tshuab ntsuas hluav taws xob uas tsim cov duab ntawm cov qauv los ntawm kev tshuaj xyuas qhov chaw nrog lub teeb tsom ntawm electrons. Cov electrons cuam tshuam nrog cov atoms hauv cov qauv, ua ntau yam teeb liab uas muaj cov ntaub ntawv hais txog qhov chaw saum npoo av thiab muaj pes tsawg leeg ntawm cov qauv.
scanning electron microscopy siv rau dab tsi?
Vim nws qhov tob ntawm kev tsom xam, lub tshuab ntsuas hluav taws xob ntsuas hluav taws xob yog EM analog ntawm lub tso suab lub teeb tsom. Nws muab cov duab ntxaws ntxaws ntawm cov chaw ntawm lub hlwb thiab tag nrho cov kab mob uas tsis tuaj yeem ua los ntawm TEM. Nws kuj tseem siv tau rau kev suav particle thiab kev txiav txim loj, thiab rau kev tswj cov txheej txheem.
Dab tsi yog scanning electron microscope siv los kawm?
Scanning electron microscope (SEM) yog siv los kawm qhov topography ntawm cov ntaub ntawv thiab muaj kev daws teeb meem ntawm ∼2 nm. Ib qho electron sojntsuam yog scanning saum npoo ntawm cov khoom thiab cov electrons cuam tshuam nrog cov khoom. Secondary electrons raug tso tawm ntawm qhov chaw ntawm cov qauv thiab kaw.
Lub hauv paus ntsiab lus ntawm kev tshuaj ntsuam xyuas electron microscope yog dab tsi?
Scanning electron microscopes (SEMs) siv ib lub teeb hluav taws xob rau cov duab piv txwv nrog kev daws teeb meem mus rau nanometer scale Cov electrons raug tso tawm los ntawm filament thiab collimated rau hauv ib lub teeb nyob rau hauv lub electron qhov chaw. Lub beam yog tom qab ntawd tsom rau ntawm tus qauv saum npoo los ntawm ib txheej ntawm lo ntsiab muag hauv kab hluav taws xob.
scanning electron microscope yog dab tsi thiab nws ua haujlwm li cas?
SEM yog ib qho ntsuas uas tsim cov duab loj loj los ntawm kev siv cov khoom siv hluav taws xob hloov lub teeb los tsim cov duab… tuav hauv lub tshuab nqus tsev. Lub beam taug kev los ntawm electromagnetic teb thiab lo ntsiab muag, uas tsom cov nqaj mus rau tus qauv.
Pom zoo:
Dab tsi yog scanning tunneling microscopy?
A scanning tunneling microscope yog ib hom kab mob uas siv los ntsuas qhov chaw ntawm qib atomic. Nws txoj kev loj hlob hauv 1981 tau txais nws cov neeg tsim khoom, Gerd Binnig thiab Heinrich Rohrer, tom qab ntawd ntawm IBM Zürich, Nobel nqi zog hauv Physics hauv 1986.
Los ntawm scanning electron microscope?
Ib lub tshuab ntsuas hluav taws xob ntsuas hluav taws xob yog hom hluav taws xob lub tshuab ntsuas hluav taws xob uas tsim cov duab ntawm cov qauv los ntawm kev tshuaj xyuas qhov chaw nrog lub teeb tsom ntawm electrons. Cov electrons cuam tshuam nrog cov atoms hauv cov qauv, ua ntau yam teeb liab uas muaj cov ntaub ntawv hais txog qhov chaw saum npoo av thiab muaj pes tsawg leeg ntawm cov qauv.
Puas scanning electron microscope saib cov qauv?
A scanning electron microscope (SEM) tuaj yeem siv rau thicker specimens, xws li tag nrho cov hlwb los yog cov ntaub so ntswg uas tau kho, qhuav, thiab coated nrog nyias hlau zaj duab xis . Puas scanning electron microscope saib cov qauv nyob?
Scanning electron microscopes siv qhov twg?
SEMs yog siv rau hauv cov khoom siv tshawb fawb rau kev tshawb fawb, kev tswj xyuas zoo thiab tsis ua haujlwm Hauv cov ntaub ntawv niaj hnub kev tshawb fawb, kev tshawb nrhiav rau hauv nanotubes thiab nanofibres, kub superconductors, mesoporous architectures thiab alloy lub zog, txhua tus cia siab rau kev siv SEMs rau kev tshawb fawb thiab kev tshawb nrhiav .
Nyob rau hauv qhov sib txawv scanning calorimetry?
Differential scanning calorimetry yog cov txheej txheem thermoanalytical uas qhov sib txawv ntawm cov cua sov uas yuav tsum tau ua kom qhov kub thiab txias ntawm cov qauv siv yog ntsuas raws li qhov ntsuas kub. Ob qho piv txwv thiab kev siv tau khaws cia ze li qhov kub thiab txias thoob plaws qhov kev sim.