相关实验视频
Updated: Jun 15, 2025

06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
8.9K
时间编码的信息加密与pH时钟引导的宽频发射由动态组件
Priyam Das1, Tanushree Das1, Suprotim Koley2
1Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
Angewandte Chemie (International ed. in English)
|August 22, 2024
概括
研究人员开发了一种新的pH可切换光材料,用于先进的防伪. 这种聚合诱导排放 (AIE) 系统创建了具有时间加密的动态,多层次的安全模式,增强了对复杂威胁的数据保护.
科学领域:
- 材料科学 材料科学 材料科学
- 化学 化学 化学
- 安全技术 安全技术
背景情况:
- 假冒存在重大安全风险,推动对先进的反假冒技术的需求.
- 聚合诱导排放 (AIE) 材料提供了有前途的光基加密解决方案.
- 开发动态的,多层次的安全模式仍然是一个挑战.
研究的目的:
- 为了创建一个pH可切换的光组件,用于动态的防伪应用.
- 使用化学触发器调节的pH钟开发一个时间加密策略.
- 为增强安全性设计多输入光化学逻辑门.
主要方法:
- 合成了可切换pH的光组件,使用AIEgen和阿里法酸.
- 使用化学触发调节的pH钟来控制时间分子组合和排放.
- 集成的时隔发射特性用于多维数据加密.
主要成果:
- 实现了pH值依赖的多色和短暂的白光发射.
- 成功构建了智能多输入光化学 AND 门.
- 展示了基于时间特征的先进的多维安全数据加密策略.
结论:
- 开发的基于AIE的系统为动态,分层的反假冒提供了一种新的方法.
- 光的时间控制为数据加密提供了额外的安全层.
- 这一策略通过结合时间依赖的功能来提高防伪的安全性.
相关概念视频
Atomic Emission Spectroscopy: Overview
1.7K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
1.7K
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
201
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
201
Atomic Emission Spectroscopy: Instrumentation
350
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
350
Atomic Emission Spectroscopy: Lab
151
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
151
Atomic Emission Spectroscopy: Interference
175
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
175
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.0K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.0K

