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AppliedChem, Volume 2, Issue 3 (September 2022) – 4 articles

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25 pages, 7267 KiB  
Review
Synthesis of Graphene and Related Materials by Microwave-Excited Surface Wave Plasma CVD Methods
by Golap Kalita and Masayoshi Umeno
AppliedChem 2022, 2(3), 160-184; https://doi.org/10.3390/appliedchem2030012 - 30 Aug 2022
Cited by 2 | Viewed by 3131
Abstract
Several kinds of chemical vapor deposition (CVD) methods have been extensively used in the semiconductor industries for bulk crystal growth, thin film deposition, and nanomaterials synthesis. In this article, we focus on the microwave-excited surface wave plasma CVD (MW-SWP CVD) method for growth [...] Read more.
Several kinds of chemical vapor deposition (CVD) methods have been extensively used in the semiconductor industries for bulk crystal growth, thin film deposition, and nanomaterials synthesis. In this article, we focus on the microwave-excited surface wave plasma CVD (MW-SWP CVD) method for growth of graphene and related materials. The MW-SWP CVD system consisting of waveguide, slot antenna, and dielectric windows is significant for generating high density plasma with low electron temperature, enabling low temperature growth of materials without damaging the surface of base substrates. The synthesis of graphene and hexagonal boron nitride (hBN) films has been achieved on metals, semiconductors, insulators, and dielectric substrates for application in photovoltaics, sensors, batteries, supercapacitors, fuel cells, and various other electronic devices. The details of the synthesis process for graphene films, vertically-oriented graphene, doped-graphene, and hBN films by the MW-SWP CVD method are summarized to understand the growth mechanism, which will enable further development of the plasma CVD process for material synthesis at a low temperature for industrial applications. Full article
(This article belongs to the Special Issue Nanomaterials for Energy and Environment Applications)
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11 pages, 12067 KiB  
Article
The Effect of Cation Exchange on the Pore Geometry of Zeolite L
by Lisa A. Price, Zöe Jones, Antony Nearchou, Gavin Stenning, Daniel Nye and Asel Sartbaeva
AppliedChem 2022, 2(3), 149-159; https://doi.org/10.3390/appliedchem2030011 - 15 Jul 2022
Cited by 1 | Viewed by 2229
Abstract
Zeolites with the LTL framework topology are attractive materials for use in optoelectronics, gas adsorption and as chemical reactors. This is due to their unique, one-dimensional (1D) channel systems which are large enough to act as hosts for organic dye molecules and other [...] Read more.
Zeolites with the LTL framework topology are attractive materials for use in optoelectronics, gas adsorption and as chemical reactors. This is due to their unique, one-dimensional (1D) channel systems which are large enough to act as hosts for organic dye molecules and other guest materials. Here, we use high-resolution X-ray diffraction to show the effect of cation exchange on the pore geometry of LTL-type zeolites. The nature of the exchanging cation is shown to influence the free access diameter, volume and water content of the 12-ring (12R) channel systems. As such, cation exchange can be used to tune the molecular sieving and adsorption properties of LTL-type zeolites. This offers new possibilities for these materials in technologically relevant applications. Full article
(This article belongs to the Special Issue Feature Papers in AppliedChem)
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7 pages, 2170 KiB  
Article
Stereoselective Synthesis and Isolation of (±)-trans,trans-Cyclohexane-1,2,4,5-tetraol
by Andreia A. Rosatella and Carlos A. M. Afonso
AppliedChem 2022, 2(3), 142-148; https://doi.org/10.3390/appliedchem2030010 - 12 Jul 2022
Viewed by 1722
Abstract
Cyclohexanetetrols belong to the family of cyclitols, a class of natural products known for their diverse bioactivity. Their synthesis has been reported using hydrogen peroxide as a green oxidant and water or tert-butanol as a solvent. Due to the high polarity of [...] Read more.
Cyclohexanetetrols belong to the family of cyclitols, a class of natural products known for their diverse bioactivity. Their synthesis has been reported using hydrogen peroxide as a green oxidant and water or tert-butanol as a solvent. Due to the high polarity of those compounds, a green approach for their isolation from aqueous solutions can be challenging. Here, we report the stereoselective synthesis of (±)-trans,trans-cyclohexane-1,2,4,5-tetraol combined with a novel isolation method, where is possible the isolation of the product in excellent yield without the need for derivatization, column chromatography or organic solvent extraction. Full article
(This article belongs to the Special Issue Feature Papers in AppliedChem)
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14 pages, 1982 KiB  
Article
pH-Sensitive Sensors at Work on Poultry Meat Degradation Detection: From the Laboratory to the Supermarket Shelf
by Lisa Rita Magnaghi, Camilla Zanoni, Elena Bancalari, Jasmine Hadj Saadoun, Giancarla Alberti, Paolo Quadrelli and Raffaela Biesuz
AppliedChem 2022, 2(3), 128-141; https://doi.org/10.3390/appliedchem2030009 - 24 Jun 2022
Cited by 2 | Viewed by 2405
Abstract
In the last twenty years, the number of publications presenting generalized pH-sensitive devices proposed for food freshness monitoring has been steadily growing, but to date, none of them have succeeded in exiting the laboratory and reaching the supermarket shelf. To reach this scope, [...] Read more.
In the last twenty years, the number of publications presenting generalized pH-sensitive devices proposed for food freshness monitoring has been steadily growing, but to date, none of them have succeeded in exiting the laboratory and reaching the supermarket shelf. To reach this scope, we developed a large-scale applicable pH-sensitive sensor array to monitor perishable foods’ degradation. We ensured freshness monitoring in domestic conditions, using sales packages and during chilled storage, by simple naked-eye readout and multivariate imaging analysis, and we fully corroborated the device by (i) projection of unknown independent samples in the PCA model, (ii) TVB-N quantification and (iii) microbiological assay. The choice of commercial and cheap dye and polymeric support already employed in food packaging ensures the low-cost and scalability of the device and the promising results obtained make this device an eligible candidate for large-scale implementation. Full article
(This article belongs to the Special Issue Feature Papers in AppliedChem)
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