On the existence of and mechanism for microwave-specific reaction rate enhancement.
On the existence of and mechanism for microwave-specific reaction rate enhancement.
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DOI：
10.1039/c4sc03372h
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发表时间：
2015-04-01
期刊：
影响因子：
8.4
通讯作者：
Stiegman AE
中科院分区：
文献类型：
--
作者：
Dudley GB;Richert R;Stiegman AE
微波特定的化学速率增强源于溶液中溶剂化偶极分子的选择性加热和能量积累。使用微波辐射来驱动化学反应已经在几乎所有的化学领域变得无处不在。在所有这些领域，主要是由于快速和方便的加热导致显着更高的反应速率，以及其他优点，包括增强的产品选择性和材料性能的控制。虽然微波加热作为一种使能技术继续增长，但对微波加热性质的基础研究并没有以同样的速度增长。在均相溶液中进行化学反应的情况下，特别是合成有机反应，对于速率增强的起源存在相当大的争议，其中一个基本问题是是否存在微波特定的效应，不同于在常规对流加热下可以获得的效应，其可以加速反应速率。在这个角度来看，我们讨论了独特的方面微波加热的分子在溶液中，并讨论了起源和性质的微波特定的影响所产生的过程中的反应物在溶液中的“选择性加热”。积分到这个讨论是从介电弛豫光谱，它提供了一个模型，通过德拜弛豫过程的选择性加热领域的工作。该观点还包括一个关键的讨论假设的非热效应（或者在这里归类为共振过程）和大纲的具体反应参数的化学系统中，微波特定的德拜弛豫过程可以导致可观察到的反应速率增强。
Microwave-specific chemical rate enhancement originates from the selective heating and accumulation of energy by solvated dipolar molecules in solution. The use of microwave radiation to drive chemical reactions has become ubiquitous in almost all fields of chemistry. In all of these areas it is principally due to rapid and convenient heating resulting in significantly higher rates of reaction, with other advantages including enhanced product selectivity and control of materials properties. Although microwave heating continues to grow as an enabling technology, fundamental research into the nature of microwave heating has not grown at the same rate. In the case of chemical reactions run in homogeneous solution, particularly synthetic organic reactions, there is considerable controversy over the origins of rate enhancement, with a fundamental question being whether there exist microwave-specific effects, distinct from what can be attained under conventional convective heating, that can accelerate a reaction rate. In this Perspective, we discuss unique aspects of microwave heating of molecules in solution and discuss the origin and nature of microwave-specific effects arising from the process of “selective heating” of reactants in solution. Integral to this discussion is work from the field of dielectric relaxation spectroscopy, which provides a model for selective heating by Debye relaxation processes. The Perspective also includes a critical discussion of hypotheses of non-thermal effects (alternatively classified here as resonant processes) and an outline of specific reaction parameters for chemical systems in which microwave-specific Debye relaxation processes can result in observable reaction rate enhancement.
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影响因子：
3.6
作者：
Chen, Po-Kai;Rosana, Michael R.;Stiegman, A. E.
通讯作者：
Stiegman, A. E.
影响因子：
3.3
作者：
BOSE, AK;MANHAS, MS;ROBB, EW
通讯作者：
ROBB, EW
影响因子：
4.4
作者：
HALL, RT;DOWLING, JM
通讯作者：
DOWLING, JM
影响因子：
1.8
作者：
GEDYE, R;SMITH, F;ROUSELL, J
通讯作者：
ROUSELL, J
影响因子：
2.8
作者：
Buchner, R;Barthel, J;Stauber, J
通讯作者：
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