Dynamics of excited states in nanoscale materials

This tutorial provides a broad perspective on the synthesis, characterization, and size-dependent dynamics of nanoscale materials. Synthetic strategies include bottom-up, top-down, and hybrid strategies in gas and condensed phases. Advances in imaging and structure analysis provide the spatial information to correlate dynamic phenomena to structure in complex nanocomposites. Excited-state dynamics can change with material dimensions due to changes in the properties of the host and due to unique nanoscale phenomena such as plasmon resonance in metals and quantum confinement in semiconductors.     

Modern analytical supercritical fluid chromatography using columns packed with sub-2 μm particles: A tutorial

This tutorial provides an overview of the possibilities, limitations and analytical conditions of modern analytical supercritical fluid chromatography (SFC) using columns packed with sub-2 μm particles. In particular, it gives a detailed overview of commercially available modern SFC instrumentation and the detectors that can be employed (UV, MS, ELSD, FID, etc.). Some advice on the choice of the stationary phase dimensions and chemistries, the nature of the mobile phase (choice of organic modifier and additives) and its flow rate as well as the backpressure and temperature are also provided. Finally, several groups of potentially problematic compounds, including lipophilic compounds, hydrophilic substances and basic drugs, are discussed in detail. All these families of analytes can be resolved with SFC but require specific analytical conditions.     

卓越教师职前培养模式的实践与创新——以化学学科为例

The current training of pre-service teachers suffers from the low percentage (20%) of PCK from students themselves, low teacher-to-student ratio, short schooling terms, less teacher-student interactions, less practice courses offered, and little practice time. In this regard, our work begins with improving normal university students' PCK (ontological knowledge, conditional knowledge, practical knowledge). The practice uses the double guide system (mentoring and peer-leading) as the main tool to explore effective culture model for chemistry-majoring normal university students. In the innovation, three practice modes, teaching design-based simulation, observing the activities of teaching, and trainee teaching under real-life situation, have been adopted to enhance the training.     

Optical microfibers and nanofibers: A tutorial

In this paper, we present a tutorial introduction to optical microfibers and nanofibers regarding their optical properties, fabrication and applications, with a brief outlook into future trends in this area.     

The management and exploitation of naturally light-emitting bacteria as a flexible analytical tool: A tutorial

Conventional detection of toxic contaminants on surfaces, in food, and in the environment takes time. Current analytical approaches to chemical detection can be of limited utility due to long detection times, high costs, and the need for a laboratory and trained personnel. A non-specific but easy, rapid, and inexpensive screening test can be useful to quickly classify a specimen as toxic or non toxic, so prompt appropriate measures can be taken, exactly where required. The bioluminescent bacteria-based tests meet all these characteristics. Bioluminescence methods are extremely attractive because of their high sensitivity, speed, ease of implementation, and statistical significance. They are usually sensitive enough to detect the majority of pollutants toxic to humans and mammals.