| Feb 09, 2023 |
|
(Nanowerk Information) In a paper revealed in Superior Supplies Interfaces (“Magnetic field-induced synthesis of one-dimensional nickel nanowires for enhanced microwave absorption”), a analysis group reported the synthesis of polyvinylpyrrolidone coated nickel nanowires (PNNWs) by solvothermal technique assisted by excessive magnetic subject, and utilized to reinforce microwave absorption.
|
|
The joint analysis group was led by Prof. WANG Hui and affiliate Prof. SHENG zhigao from Hefei Institutes of Bodily Science, Chinese language Academy of Sciences.
|
|
Amongst many microwave absorbers which were studied, one-dimensional magnetic nanowires have attracted a lot consideration due to their wonderful mechanical properties, giant facet ratio and wonderful digital transmission efficiency. Nonetheless, the graceful floor and inadequate magnetism of nickel nanowires synthesized by conventional strategies inhibit the method of EW passing by way of the absorber and dissipating as warmth power. Due to this fact, it’s pressing to discover a new technique to extend the floor roughness and magnetic properties of nickel nanowires and to reinforce their microwave absorption efficiency.
|
 |
| Schematic illustration of EW attenuation mechanisms of 9T-PNNW samples. a) EW incidence, b) interfacial polarization, c) magnetic loss, d) conductive loss, and dipolar polarization. (Picture: QIANG Yong)
|
|
On this analysis, researchers used solvothermal technique induced by exterior magnetic subject to synthesize PNNWs, and the morphology and properties of PNNWs confirmed a magnetic subject strength-dependent relationship.
|
|
9T-PNNW synthesized in 9 T magnetic subject has increased facet ratio, bigger particular floor space and higher magnetic properties, which endows it with wonderful microwave absorption efficiency. When the thickness is 4.5 mm, the minimal reflection loss (29.82 dB) is reached at 4.08 GHz. When the thickness is 1.5 mm, the efficient absorption bandwidth from 14.4 GHz to 18.0 GHz can exceed 3.6 GHz. This materials induces quite a lot of electromagnetic loss mechanisms to attenuate electromagnetic waves, amongst which dielectric loss is dominant, whereas magnetic loss, present loss and resonance impact solely play an auxiliary function.
|
|
This work has opened up a brand new means for the rational design and preparation of nickel nanowires, and extra importantly, the magnetic subject has reference significance for the regulation of absorbent efficiency.
|
",
type: "opt-in",
theme: "edgeless",
palette: {
popup: {
background: "#eee",
text: "#889"
},
button: {
background: "#58f",
text: "#fff"
}
},
content: {
link: "Сookie policy",
allow: "Got it!",
deny: " ",
href: "https://www.nanowerk.com/cookie_policy.php"
},
onInitialise: function(status) {
if(status == cookieconsent.status.allow) myScripts();
},
onStatusChange: function(status) {
if (this.hasConsented()) myScripts();
}
})
});
function myScripts() {
// Paste here your scripts that use cookies requiring consent. See examples below
// Google Analytics, you need to change 'UA-00000000-1' to your ID
(function(i,s,o,g,r,a,m)function()[]).push(arguments),i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
)(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-00000000-1', 'auto');
ga('send', 'pageview');
// Facebook Pixel Code, you need to change '000000000000000' to your PixelID
!function(f,b,e,v,n,t,s)
{if(f.fbq)return;n=f.fbq=function(){n.callMethod?
n.callMethod.apply(n,arguments):n.queue.push(arguments)};
if(!f._fbq)f._fbq=n;n.push=n;n.loaded=!0;n.version='2.0';
n.queue=[];t=b.createElement(e);t.async=!0;
t.src=v;s=b.getElementsByTagName(e)[0];
s.parentNode.insertBefore(t,s)}(window, document,'script',
'https://connect.facebook.net/en_US/fbevents.js');
fbq('init', '000000000000000');
fbq('track', 'PageView');
}
