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Reversible and Irreversible Processes01:14

Reversible and Irreversible Processes

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The thermodynamic processes can be classified into reversible and irreversible processes. The processes that can be restored to their initial state are called reversible processes. It is only possible if the process is in quasi-static equilibrium, i.e., it takes place in infinitesimally small steps, and the system remains at equilibrium However, these are ideal processes and do not occur naturally. An ideal system undergoing a reversible process is always in thermodynamic equilibrium within...
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Volatilization01:10

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Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

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Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
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Voltammetry: Overview

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Voltammetry is an electroanalytical technique in which the current flowing through an electrochemical cell is measured as a function of applied potential, typically under conditions of concentration polarization. The technique provides valuable information about redox-active species, and the current response is plotted as a voltammogram.
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相关实验视频

Updated: May 8, 2025

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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通过等离子驱动相位工程过程对可逆非挥发性VO2薄膜进行定量研究.

Samiksha Bajaj1, Shang-Jui Chiu2, Jia Wei Chen3

  • 1Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 300, Taiwan.

Small (Weinheim an der Bergstrasse, Germany)
|February 12, 2025
PubMed
概括

等离子辐射控制了纳米电子的二氧化 (VO2) 阶段过渡. 阿贡等离子制造具有明显电阻状态的可调节相 (M1,M1-R,R),使设备在室温下可稳定应用.

关键词:
一个单临床单临床.单临床 - 四边形的鲁化物.阶段工程工程的阶段工程.血辐射辐射的使用方法二氧化瓦纳二氧化是什么

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 纳米技术 纳米技术

背景情况:

  • 相关材料中相变的纳米级控制对于先进的纳米电子学至关重要.
  • 二氧化瓦纳 (VO2) 呈现温度驱动的金属绝缘体过渡,使其成为电子应用的候选者.

研究的目的:

  • 为了研究低压等离子体辐射诱导的VO2薄膜中的相位过渡现象.
  • 探索异质相的形成及其在室温下的电阻状态.

主要方法:

  • 用不同功率级别的 (Ar) 血对VO2薄膜进行辐射.
  • 使用高分辨率传输电子显微镜 (HRTEM) 来分析相位结构和平面间距.
  • 介电力显微镜 (DFM) 用于描述不同相的介电反应.

主要成果:

  • 等离子体功率调节导致同质 (M1,R) 和异质 (M1-R) 阶段的形成.
  • HRTEM揭示了不同的阶段:单临床 (M1) 在0W,阶段共存 (M1-R) 在50W,和四边形路 (R) 在90W.
  • DFM显示了每个相的独特介电反应 (M1的3mV,M1-R的5mV,R的7.44mV),在室温下稳定了M1-R相.

结论:

  • 在室温下,等离子辐射有效控制和稳定VO2相,包括共存的M1-R相.
  • 观察到的可逆相变和稳定的电阻状态对纳米电子设备应用具有前景.
  • 等离子体几何学修改可以稳定以前不稳定的相位,扩大未来纳米电子设计的可能性.