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Realizations, Characterizations, and Manipulations of Two-Dimensional Electron Systems Floating above Superfluid Helium Surfaces
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作者 魏浩然 吴蒙蒙 +4 位作者 王任飞 何明城 Hiroki Ikegami 刘阳 程智刚 《Chinese Physics Letters》 SCIE EI CAS CSCD 2023年第12期133-137,共5页
Electron systems in low dimensions are enriched with many superior properties for both fundamental research and technical developments. Wide tunability of electron density, high mobility of motion, and feasible contro... Electron systems in low dimensions are enriched with many superior properties for both fundamental research and technical developments. Wide tunability of electron density, high mobility of motion, and feasible controllability in microscales are the most prominent advantages that researchers strive for. Nevertheless, it is always difficult to fulfill all in one solid-state system. Two-dimensional electron systems(2DESs) floating above the superfluid helium surfaces are thought to meet these three requirements simultaneously, ensured by the atomic smoothness of surfaces and the electric neutrality of helium. Here we report our recent work in preparing, characterizing, and manipulating 2DESs on superfluid helium. We realized a tunability of electron density over one order of magnitude and tuned their transport properties by varying electron distribution and measurement frequency. The work we engage in is crucial for advancing research in many-body physics and for development of single-electron quantum devices rooted in these electron systems. 展开更多
关键词 ELECTRON SMOOTHNESS dimensions
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白芷免洗面膜的制备及质量评价 被引量:4
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作者 杨红梅 刘玲玲 +4 位作者 何明城 江政 莫思敏 唐慧艳 曽妍芸 《广州化工》 CAS 2021年第23期71-75,共5页
以白芷提取物为主要原料制备质量合格,且具有美白护肤作用的白芷免洗面膜。优化白芷中香豆素类物质的提取条件;确定基质处方的基本组成,筛选出最佳的基质处方;制备白芷提取物、面膜基质及面膜,并对面膜进行质量检查和络氨酸酶抑制率的... 以白芷提取物为主要原料制备质量合格,且具有美白护肤作用的白芷免洗面膜。优化白芷中香豆素类物质的提取条件;确定基质处方的基本组成,筛选出最佳的基质处方;制备白芷提取物、面膜基质及面膜,并对面膜进行质量检查和络氨酸酶抑制率的测定。结果确定:白芷中提取香豆素类物质的最优条件;面膜基质的处方组成;白芷面膜对络氨酸酶有明显的抑制作用。所以可以通过现代技术提取白芷的有效成分制备相对安全、有效的免洗面膜。 展开更多
关键词 面膜 白芷提取 基质 质量评价
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