Video: Cov nanotubes puas muaj cov ntsiab lus melting siab?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Qhov teeb tsa tau tso cai tswj hwm tus kheej nanoparticles thiab cua sov tus neeg CNTs los ntawm kev siv tam sim no rau lawv. CNTs tau pom tias tuaj yeem tiv taus kub kub , mus txog melting point ntawm 60-nm-inch W particles (~ 3400 K).
Kuj paub, puas fullerene muaj lub siab melting point?
Lawv yog tsim los ntawm loj molecules tab sis ua tsis yog muaj loj heev covalent qauv. Tsis muaj zog intermolecular rog muaj nyob ntawm tus kheej buckyballs. Tsawg zog yog yuav tsum tau kov yeej cov rog no, yog li cov khoom muaj xws li buckyballs yog nplua thiab muaj qis melting cov ntsiab lus tshaj graphite lossis pob zeb diamond.
Tom qab ntawd, lo lus nug yog, vim li cas pob zeb diamond muaj lub siab melting point? Txhua carbon atom yog covalently bonded rau plaub lwm carbon atoms. Ntau lub zog xav tau los cais cov atoms hauv pob zeb diamond . Qhov no yog vim covalent bonds muaj zog, thiab pob zeb diamond muaj ntau ntau covalent bonds. Qhov no ua rau pob zeb diamond lub melting point thiab kub point heev siab.
Ua raws li qhov no hauv kev xav, vim li cas graphite tau txais lub siab melting point?
Txawm li cas los xij, graphite tseem muaj ib heev siab melting thiab kub point vim hais tias muaj zog covalent bonds uas tuav cov pa roj carbon atoms ua ke nyob rau hauv cov khaubncaws sab nraud povtseg yuav tsum tau ib tug ntau ntawm tshav kub lub zog rau tawg.
Vim li cas fullerene muaj qhov qis melting point?
Qhov no qhia tau hais tias raws li buckminsterfullerene muaj zog inter-molecular zog ntau dua li pob zeb diamond, nws muaj ntau qis melting / kub point . (tsawg zog yuav tsum tau ua txhaum lub zog ntawm attraction.) Fullerene muaj cov ntsiab lus melting tsawg vim nws muaj tsis muaj zog bonds.
Pom zoo:
Dab tsi bonds muaj cov ntsiab lus siab melting?
Siab melting thiab boiling cov ntsiab lus - Ionic daim ntawv cog lus muaj zog heev - xav tau ntau lub zog los rhuav tshem lawv. Yog li ionic tebchaw muaj siab melting thiab boiling ntsiab lus. Conductive thaum ua kua - Ions yog them cov khoom, tab sis ionic compounds tsuas yog ua hluav taws xob yog tias lawv cov ions dawb txav
Cov hlau hloov pauv puas muaj cov ntsiab lus melting tsawg?
Cov ntsiab lus melting-cov ntsiab lus ntawm cov hlau hloov pauv yog siab vim 3d electrons muaj rau cov hlau sib txuas. Qhov ntom ntawm cov hlau hloov pauv yog siab rau tib yam li cov ntsiab lus kub kub. Cov hlau hloov pauv yog tag nrho cov hlau ntom ntom nrog cov ntsiab lus siab melting thiab kub kub
Dab tsi yog lub ntsiab lus ntawm kev hloov pauv lom neeg hauv cov ntsiab lus ntawm allele zaus?
Microevolution, los yog evolution ntawm ib tug me me, yog txhais raws li ib tug kev hloov nyob rau hauv lub zaus ntawm noob variants, alleles, nyob rau hauv ib tug pej xeem ntau tiam. Lub teb ntawm biology uas kawm txog allele frequencies nyob rau hauv cov pejxeem thiab yuav ua li cas lawv hloov lub sij hawm yog hu ua pej xeem noob caj noob ces
Vim li cas cov ntsiab lus thiab cov ntsiab lus yog cov tshuaj ntshiab?
Elements thiab compounds yog ob qho tib si piv txwv ntawm cov khoom ntshiab. Ib yam khoom uas tuaj yeem tawg mus rau hauv cov tshuaj lom neeg yooj yim dua (vim tias nws muaj ntau dua ib qho) yog ib qho khoom sib xyaw. Piv txwv li, dej yog acompound tsim los ntawm cov ntsiab lus hydrogen thiaboxygen
Puas yog cov ntsiab lus uas muaj cov tshuaj lom neeg zoo sib xws yuav pom nyob rau tib lub sijhawm lossis hauv tib pab pawg piav qhia koj cov lus teb?
Qhov no yog vim hais tias cov tshuaj muaj zog nyob ntawm tsis muaj valence electrons. Raws li nyob rau hauv ib pawg tag nrho cov ntsiab lus muaj tib yam tsis muaj valence electron uas yog vim li cas lawv muaj cov tshuaj zoo sib xws tab sis nyob rau hauv ib lub sij hawm tsis muaj valence electron sib txawv uas yog vim li cas lawv txawv nyob rau hauv chemical zog