1. Dab tsi yog cov khoom siv hlau nanoporous?
Nanoporous Metals (NPM) yog ib chav kawm ntawm cov ntaub ntawv hlau nrog kev sib txuas ntawm ligaments (zoo curvature) thiab nanoporous channels (tsis zoo curvature), lub porosity uas tsis tsawg tshaj li 50%, thiab cov submicron pores (xws li micropores, mesopores thiab macropores nrog diameters. ntawm 50-1000 nm) muaj txiaj ntsig zoo rau thaj chaw tshwj xeeb ntawm cov npuas dej. Raws li pom hauv daim duab 1, qhov pore loj yuav tsum yog nanometer loj!
Kev faib tawm ntawm cov khoom ntxeem tau ntawm ntau qhov sib txawv (los ntawm sab laug mus rau sab xis, nce hauv qhov loj)
Feem ntau hais lus, cov synthesis ntawm ntxeem tau nanometals yog feem ntau los ntawm sab saum toj-down dawb tshuaj corrosion dealloying thiab electrochemical dealloying, thiab kuj yuav npaj los ntawm hauv qab-up synthesis siv template txoj kev. Ntawm no peb tsuas tham txog txoj kev npaj ntawm dealloying los npaj porous hlau. Rau qee lub ntsiab lus uas feem ntau siv thiab ua haujlwm, ob qho khoom siv / ntau yam khoom siv uas tuaj yeem siv rau kev sib txuas lus yuav tsum ua raws li cov ntsiab lus hauv qab no: 1. Lub peev xwm sib npaug ntawm cov khoom yuav tsum sib txawv heev; 2. Cov ntsiab lus piv ntawm cov khoom muaj qhov pib; 3. Ib qho kev daws teeb meem ib zaug tuaj yeem tsim tau.
IUPAC Lub Sijhawm Lub Sijhawm Cov Ntsiab Lus, lub thawv liab thiab xiav feem ntau yog siv cov khoom siv hlau
Tsis tas li ntawd, nanopore kev faib tawm ntawm cov hlau nanoporous tuaj yeem ua ib yam lossis tsis sib xws, tau kawg, ob qho tib si muaj nyob rau hauv feem ntau. Lub caij no, lub crystallographic orientation thiab crystal defects ntawm nanoporous hlau nyob ntawm seb lub microstructure ntawm alloy precursors thiab cov txheej txheem ntawm dealloying. Vim muaj qhov tshwj xeeb microstructure, cov hlau nanoporous tuaj yeem ua rau pom cov khoom ntawm cov hlau thiab cov ntaub ntawv nanostructured, thiab lawv cov qauv zoo sib xws nrog cov khoom siv hluav taws xob, sib nqus, optical, mechanical, catalytic thiab electrocatalytic zog.
a). TEM of np-AuAg, b) 3D reconstruction model
2. Lub microscopic yam ntxwv ntawm nanoporous hlau?
Hauv txoj kev xav, ib lossis ntau dua ntawm peb lub tswv yim hauv qab no tuaj yeem ua haujlwm thaum cov hlau yaj zoo dua.
(1) Ob qho hlau yog ionized, thiab tom qab ntawd cov hlau muaj nuj nqis rov qab;
(2) Tsuas yog lub hauv paus hlau yog ionized thiab nkag mus rau hauv cov tshuaj, thaum lub atoms ntawm noble hlau yog aggregated los ntawm nto diffusion;
(3) Tsuas yog lub hauv paus hlau ionizes thiab nkag mus rau hauv cov kev daws teeb meem, thiab cov atoms ntawm ob lub hlau txav mus rau hauv cov khoom theem los ntawm bulk diffusion.
Post lub sij hawm: Feb-14-2022
