24小时热门版块排行榜

>论坛更新日志 (4855)
>文献求助 (365)
>导师招生 (324)
>论文投稿 (318)
>博后之家 (258)
>虫友互识 (192)
>硕博家园 (106)
>考博 (99)
>有机交流 (89)
>学术会议 (80)
>招聘信息布告栏 (79)
>基金申请 (43)
>休闲灌水 (39)
>教师之家 (30)
>找工作 (28)
>考研 (26)

返回列表

tl-tomorrow

金虫 (小有名气)

应助: 0 (幼儿园)
金币: 697
帖子: 51
在线: 105.1小时
虫号: 3505257

[交流] 纳米材料三角形片状的生成机理

有人了解为什么片状纳米材料长成正三角形的机理吗？我看到很多化学气相沉积得到的是三角形的片。我自己做的一些团簇也有组装成三角形的片，也有成矩形的片。

回复此楼

» 猜你喜欢

PDMS膜在溶液中的离子透过率已经有0人回复
攒人品论文祈福已经有139人回复
有机高分子材料论文润色/翻译怎么收费? 已经有243人回复
science advances的AAAS系统上返修已经有0人回复
science advances的AAAS系统上返修问题已经有3人回复
LDPE黑十字为什么那么大已经有0人回复
西南交通大学医学院2027年接收推荐免试攻读研究生（含直博生）已经有159人回复
西南交通大学医学院2027年接收推荐免试攻读研究生（含直博生）已经有159人回复
西南交通大学医学院2027年接收推荐免试攻读研究生（含直博生）已经有157人回复
西南交通大学医学院2027年接收推荐免试攻读研究生（含直博生）已经有152人回复
博士申请已经有14人回复

» 本主题相关商家推荐: (我也要在这里推广)

» 抢金币啦！回帖就可以得到:

查看全部散金贴

1楼 2020-07-16 01:02:45

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

回帖支持 ( 显示支持度最高的前 50 名 )

tl-tomorrow

金虫 (小有名气)

应助: 0 (幼儿园)
金币: 697
帖子: 51
在线: 105.1小时
虫号: 3505257

When a single twin plane is formed, the resulting nucleus, at the early stage of growth, is a hexagonal plate due to the 6-fold symmetry of fcc structures (Figure 13). Each side of the hexagon is either a concave side or a convex side because of the presence of a twin plane. When atoms diffuse toward the nucleus and adsorb to grow the NC, they can adsorb either on a concave or on a convex face. On the convex side, each atomic site has only three closest neighbors, and the stabilization energy is therefore quite low. On the other hand, on the concave side, newly adsorbed atoms are stabilized by four neighbors from several facets, increasing the stabilization energy. Atoms will then preferentially adsorb on the concave sides, favoring the growth of the NC along these sides rather than the convex sides. The growth will be favored on the facets that present a concave-type surface, while the convex-type surface does not favor adsorption of new atoms and will remain unchanged. This can also be explained by the Gibbs−Thomson formula which states that the chemical potential is inversely proportional to the curvature. Δμ γ = Ω + (1/ R1+1/ R2)
where Δμ is the change in the chemical potential, γ the interfacial free energy, Ω the atomic volume, and R1 and R2 are the radii curvature.2 For a convex surface where the curvature is positive, the chemical potential change is positive and the adsorption of atoms is favored on a flat surface rather that a convex surface. On the other hand, for a concave surface where the curvature is negative, the change in the chemical is negative and the adsorption of atoms on the concave side is favored.