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Early Edition
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Thin Layer Chromatography as a Pilot Method for High Performance Liquid Chromatography to Analyze Sesquiterpenes in the Genus Lindera
Shuyu Xu, Siwei Wang, Hong Zhou, Jiamin Li, Xiaoqing Wu, Xin Chen, and Hezhong Jiang
General Chemistry    DOI: 10.21127/yaoyigc20210003
Abstract   PDF (565KB)
In this paper, we developed and validated a simple and accurate thin layer chromatography method for the analysis of the chemical components in the plants of genus Lindera (the Lauraceae family). High performance liquid chromatography method was used to verify the results of thin layer chromatography analysis.
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Electrospinning as an Important Tool for Fabrication of Nanofibers for Advanced Applications—a Brief Review
Merin Sara Thomas, Prasanth K. S. Pillai, Scott C. Farrow, Laly A. Pothan and Sabu Thomas
General Chemistry    DOI: 10.21127/yaoyigc20200022
Abstract   PDF (860KB)
Nanomaterials are attracting renewed interest due to their novel properties, which are not seen in their conventional micro state counterparts. They are used in advanced applications in the fields of catalysis, medicine, electronics, optics and membranes. Electrospinning is one of the simplest and cheapest methods to make nano-porous polymer membranes, and these offer a large surface area-to-volume ratio, high porosity and small pore size. These electrospun nonwoven mats could be employed in myriad applications ranging from filtration, sensors, electrode materials, drug delivery, cosmetics, and tissue scaffolding. This technique can introduce novel functional characteristics, and hence by changing the basic experimental set up, solvent, solution and polymer characteristics can alter the composition, morphology, and porosity of the processed material. The unique structural and functional characteristics inherited at submicron to nanoscale dimensions via electrospinning makes it an attractive technique for advanced industrial applications.
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Meyer-Schuster Rearrangement—Convenient Synthesis of α,β-Unsaturated α-Iodinated Aldehydes and Ketones
Juri M. Timonen, Petri A. Turhanen
General Chemistry    DOI: 10.21127/yaoyigc20200023
Abstract   PDF (596KB)
The Meyer-Schuster rearrangement reaction has been known for almost a hundred years. It has been used to prepare unsaturated aldehydes, ketones, and even esters from propargyl alcohols. Thirty years ago, the same reaction was found to produce also α-halogenated aldehydes and ketones under suitable conditions. In the last thirty years, several methods have been developed utilizing the Meyer-Schuster rearrangement in the synthesis of halogenated building blocks for use in synthetic chemistry. In this perspective, we describe the progress in the field.
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The Enigmas of Surfaces
Abraham Marmur
General Chemistry    DOI: 10.21127/yaoyigc20200021
Abstract   PDF (565KB)
The properties of surfaces are crucial for many processes in a variety of areas in biology, industry, and daily life. Surprisingly, even though surface phenomena have been studied for more than 200 years by some of the greatest physicists, mathematicians, and engineers, there are still quite a few enigmas to be solved. This paper presents some fundamental enigmas related to the surface tensions of liquids and solids that were either partially solved or yet mostly unsolved.
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Fullerene in Carbon Nanoring: A Saturn-Like Supramolecular Complex
Jie Zhang, Chunru Wang, and Taishan Wang
General Chemistry    DOI: 10.21127/yaoyigc20200018
Abstract   PDF (810KB)
Fullerenes have attracted much attention because of their unique electronic structure and spherical cage shape. Specially, fullerenes have been widely used as guest in supramolecular chemistry due to their spherical structures. Recently, the supramolecular complexes of fullerenes and several types of carbon nanorings have been constructed and investigated. The complex of fullerene in carbon nanoring is like a Saturn, and this unique kind of supramolecular complexes will have potential applications in chemical, material and physical fields. In this review, various complexes of fullerene in carbon nanoring and their special properties are described. We hope to expand the application of these supramolecular complexes in various fields.
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Organic NIR Photodetectors: Pushing Photodiodes Beyond 1000 nm
Seth C. Rasmussen, Spencer J. Gilman, Evan W. Culver, and Wyatt D. Wilcox
General Chemistry    DOI: 10.21127/yaoyigc20200019
Abstract   PDF (997KB)
Advances in the synthesis of low bandgap (Eg < 1.5 eV) conjugated polymers has produced organic materials capable of absorbing near-infrared (NIR) light (800—2500 nm), with these materials first applied to photodiode NIR detectors in 2007 as an alternative to more traditional inorganic devices. Although the development of organic NIR photodetectors has continued to advance, their ability to effectively detect wavelengths in the low-energy portion of the NIR spectrum is still limited. Efforts to date concerning the production of photo-diode-based devices capable of detecting light beyond 1000 nm are reviewed.
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Binder-Free Monoliths of Graphene Dried Foam Films Covering Polyaniline for Supercapacitors Electrode
Wufeng Chen, Junhao Chen, and Lifeng Yan
General Chemistry    DOI: 10.21127/yaoyigc20200014
Abstract   PDF (920KB)
Dried foam films (DFF) of graphene oxide (GO) has been prepared by dipping a titanium mesh in the solution of GO, and then it was reduced by electrochemical method. Next, the as-prepared water-containing reduced grapheme oxide (rGO) DFF film works as electrode for electrocpolymerization of aniline onto its surface for preparing a polyaniline/graphene monolith while the titanium mesh acts as the electron collector. The as-obtained composite film is binder-free and has highly surface area, conductivity, and can be used for supercapacitor electrode. Then network of plenty polyaniline nanoparticles formed on the surface of rGO film by electrochemical polymerization, which works as the material for pseudocapacitance. When the film is used as a supercapacitor electrode, the maximum specific capacitance is as high as 633.4 F g−1 and the specific capacitance retains 75% of the initial after constant charge discharge 5000 cycles at current density of 10 A g−1, indicating that the nanocomposite is a suitable active material for supercapacitors.
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