Mahwindo anobatsira kusvika 60% yesimba rakarasika muzvivakwa. Mumamiriro okunze anopisa, mahwindo anopisa kubva kunze, achibudisa simba rekupisa muchivako. Kana kunze kuchitonhora, mahwindo anopisa kubva mukati, uye anopisa kupisa kune nharaunda yekunze. Iyi nzira inodaidzwa kuti radiation inotonhorera. Izvi zvinoreva kuti mahwindo haashande pakuchengeta chivako chichidziya kana kutonhora sezvachinofanira kunge chiri.

Zvingaite here kugadzira girazi rinogona kubatidza kana kudzima iyi radiative cooling effect iri yega zvichienderana nekupisa kwayo? Mhinduro ndihongu.

Mutemo weWiedemann-Franz unotaura kuti zviri nani kushandiswa kwemagetsi kwezvinhu, zviri nani kupisa kwekushisa. Zvisinei, vanadium dioxide zvinhu zvakasiyana, izvo zvisingateereri mutemo uyu.

Vatsvakurudzi vakawedzera hutete hwakatsetseka hwevanadium dioxide, musanganiswa unoshanduka kubva kune insulator kuenda kune conductor paanenge 68 ° C, kune rumwe rutivi rwegirazi.Vanadium dioxide (VO2)chinhu chinoshanda chine zvakajairika thermally induced phase transition properties. Maitiro ayo anogona kushandurwa pakati pe insulator nesimbi. Inoita se insulator patembiricha yekamuri uye sesimbi conductor patembiricha iri pamusoro pe68°C. Izvi zvinokonzerwa nekuti chimiro chayo cheatomu chinogona kushandurwa kubva mukamuri tembiricha yekristaro chimiro kuenda kune simbi chimiro pane tembiricha inopfuura 68 ° C, uye shanduko inoitika isingasviki 1 nanosecond, iyo inobatsira kune zvemagetsi zvikumbiro. Tsvagiridzo inoenderana yaita kuti vanhu vazhinji vatende kuti vanadium dioxide inogona kuita shanduko kune ramangwana reindasitiri yemagetsi.

Vatsvagiri vepayunivhesiti yekuSwitzerland vakawedzera tembiricha yevanadium dioxide kusvika pamusoro pe100 ° C nekuwedzera germanium, simbi isingawanzo, kune vanadium dioxide firimu. Vakaita pundutso muRF application, vachishandisa vanadium dioxide uye phase-change switching tekinoroji kugadzira Ultra-compact, tunable frequency mafirita kekutanga. Rudzi rutsva urwu rwesefa inonyanya kuenderana neiyo frequency renji inoshandiswa nechadenga masisitimu ekutaurirana.

Mukuwedzera, zvinhu zvemuviri zvevanadium dioxide, zvakadai seresistivity uye infrared transmittance, zvichachinja zvakanyanya panguva yekushandura. Nekudaro, akawanda maapplication eVO2 anoda kuti tembiricha ive pedyo nekamuri tembiricha, senge: smart windows, infrared detectors, nezvimwe, uye doping zvinogona kunyatso kudzikisa tembiricha yechikamu. Doping tungsten chinhu muVO2 firimu inogona kuderedza chikamu chekushandura tembiricha yefirimu kusvika kune yakatenderedza tembiricha yekamuri, saka tungsten-doped VO2 ine tarisiro yakakura yekushandisa.

Hongwu Nano's mainjiniya akawana kuti tembiricha yekuchinja kwechikamu chevanadium dioxide inogona kugadziridzwa nedoping, kushushikana, saizi yezviyo, nezvimwe zvinhu zvedoping zvinogona kuve tungsten, tantalum, niobium uye germanium. Tungsten doping inoonekwa seyakanyanya kushanda doping nzira uye inoshandiswa zvakanyanya kugadzirisa tembiricha yechikamu chekuchinja. Doping 1% tungsten inogona kuderedza kupisa kwechikamu chekuchinja kwevanadium dioxide mafirimu ne24 °C.

Madimikira e pure-phase nano-vanadium dioxide uye tungsten-doped vanadium dioxide iyo kambani yedu inogona kupa kubva mumasheya ndeaya anotevera:

1. Nano vanadium dioxide VO2, isina undoped, pure phase, phase transition tembiricha i68℃

2. Vanadium dioxide yakashongedzwa ne 1% tungsten (W1% -VO2), the phase transition tembiricha i43℃

3. Vanadium dioxide yakashongedzwa ne 1.5% tungsten (W1.5% -VO2), the phase transition tembiricha i32℃

4. Vanadium dioxide yakashongedzwa ne 2% tungsten (W2% -VO2), the phase transition tembiricha i25℃

5. Vanadium dioxide yakavharwa ne 2% tungsten (W2% -VO2), the phase transition tembiricha i20 ℃

Tichitarisira kune ramangwana riri pedyo, aya mahwindo akachenjera ane tungsten-doped vanadium dioxide anogona kuiswa pasi rose uye kushanda gore rose.