| 2 | 1/1 | 返回列表 |
| 查看: 642 | 回復(fù): 1 | ||
[求助]
求下面一段話的翻譯。。。。。實(shí)在弄不完了 謝謝
|
|
Recently study showed that phonon transport within crystalline silicon can be significantly altered when crystalline silicon is confined to the nanometer range. This phenomenon can be explained by various effects such as the increase in boundary scattering, the change of phonon dispersion relation and the quantization of phonon transport [90]. Molecular dynamics simulations show that the thermal conductivities of nanometer wires could be two orders of magnitude smaller than that of bulk silicon. Li and co-workers have measured thermal conductivities for intrinsic singlecrystalline PSNA of different diameters (22, 37, 56, and 115 nm) shown in Fig. (4a) [10]. Compared to bulk silicon, all the SiNWs have two important features: (i) the measured thermal conductivities are about two orders of magnitude lower than that of the bulk. When the wire diameter is decreased, the corresponding thermal conductivity is reduced. This indicates that enhanced boundary scattering controls phonon transport in SiNWs; (ii) Thermal conductivities of the 37, 56, and 115 nm diameter wires reach their peak values around 210, 160, and 130 K, respectively. This is in sharp contrast to the peak of bulk Si which occurs at about 25 K. As the wire diameter is reduced, the phonon boundary scattering dominates over phonon-phonon Umklapp scattering, which decreases the thermal conductivity with an increase in temperature. |
木蟲 (小有名氣)
ttxd
| 最近研究表明, 當(dāng)晶體硅被限制在納米范圍內(nèi)聲子在晶體硅內(nèi)傳輸顯著改變。這種現(xiàn)象可以用不同的影響來解釋,如邊界散射的增加、聲子色散關(guān)系變化以及聲子傳輸?shù)牧孔踊。分子?dòng)力學(xué)模擬表明, 納米線的熱導(dǎo)率比大體積硅可以小兩個(gè)數(shù)量級(jí)。圖 4(a) 顯示李和同事測(cè)量的不同直徑(22, 37, 56, and 115 nm) PSNA單晶內(nèi)部熱導(dǎo)率。相比大體積硅,所有的SiNWs有兩個(gè)重要特點(diǎn): (1)測(cè)量的熱導(dǎo)率比大體積硅小兩個(gè)數(shù)量級(jí);當(dāng)納米線直徑減少,相應(yīng)的熱導(dǎo)率降低,表明增強(qiáng)邊界散射可以控制聲子在SiNWs內(nèi)傳輸。(2)直徑為37、56、115 nm納米線的熱導(dǎo)率分別在210、160、130 K達(dá)到峰值,這與大體積Si 在25 K出現(xiàn)峰值形成鮮明對(duì)比,隨著納米線直徑減小,聲子邊界散射控制聲子-聲子倒逆散射, 從而導(dǎo)致熱導(dǎo)率隨溫度的增加而降低。 |
| 2 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 306求調(diào)劑 +9 | chuanzhu川燭 2026-03-18 | 9/450 |
|
|---|---|---|---|---|
|
[考研] 263求調(diào)劑 +6 | yqdszhdap- 2026-03-22 | 9/450 |
|
|
[考研] 接收2026碩士調(diào)劑(學(xué)碩+專碩) +3 | allen-yin 2026-03-23 | 4/200 |
|
|
[考研] 336化工調(diào)劑 +3 | 王大坦1 2026-03-23 | 4/200 |
|
|
[考研] 298求調(diào)劑 +8 | 上岸6666@ 2026-03-20 | 8/400 |
|
|
[考研] 276求調(diào)劑 +3 | YNRYG 2026-03-21 | 4/200 |
|
|
[考研] 一志愿中南大學(xué)化學(xué)學(xué)碩0703總分337求調(diào)劑 +4 | niko- 2026-03-22 | 4/200 |
|
|
[考研] 能源材料化學(xué)課題組招收碩士研究生8-10名 +5 | 脫穎而出 2026-03-16 | 17/850 |
|
|
[考研] 求調(diào)劑 +5 | Zhangbod 2026-03-21 | 7/350 |
|
|
[考研] 考研調(diào)劑 +4 | 來好運(yùn)來來來 2026-03-21 | 4/200 |
|
|
[考研] 354求調(diào)劑 +7 | Tyoumou 2026-03-18 | 10/500 |
|
|
[考研] 297求調(diào)劑 +11 | 戲精丹丹丹 2026-03-17 | 12/600 |
|
|
[考研] 303求調(diào)劑 +5 | 睿08 2026-03-17 | 7/350 |
|
|
[考研] 299求調(diào)劑 +6 | △小透明* 2026-03-17 | 6/300 |
|
|
[考研] 085700資源與環(huán)境308求調(diào)劑 +12 | 墨墨漠 2026-03-18 | 13/650 |
|
|
[考研] 一志愿華中科技大學(xué),080502,354分求調(diào)劑 +5 | 守候夕陽(yáng)CF 2026-03-18 | 5/250 |
|
|
[考研] 一志愿中海洋材料工程專碩330分求調(diào)劑 +8 | 小材化本科 2026-03-18 | 8/400 |
|
|
[考研] 350求調(diào)劑 +5 | weudhdk 2026-03-19 | 5/250 |
|
|
[考研] 290求調(diào)劑 +7 | ^O^乜 2026-03-19 | 7/350 |
|
|
[考研] 0856調(diào)劑,是學(xué)校就去 +8 | sllhht 2026-03-19 | 9/450 |
|