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Symmetry
Special Issues
Applications of Nanomaterials Beyond the Boundaries of Symmetry
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Special Issue "Applications of Nanomaterials Beyond the Boundaries of Symmetry"

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Chemistry: Symmetry/Asymmetry".

Deadline for manuscript submissions: 30 November 2023 | Viewed by 3611

Special Issue Editors

Prof. Dr. Sung-Chul Yi
E-Mail Website
Guest Editor
Department of Chemical Engineering, Hanyang University, Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea
Interests: electrocatalysts for energy conversion and energy generation; 3D reconstruction of fuel cell catalyst layer
Special Issues, Collections and Topics in MDPI journals
Dr. Bradha Madhavanh

E-Mail Website
Guest Editor
Department of Physics, Rathinam Technical Campus, 641021 Coimbatore, India
Interests: ceramic oxides; oxide ion conductivity; nano materials synthseis for energy applications

Special Issue Information

Dear Colleagues,

Next-generation electronic gadgets will be made from nanomaterials with unique and unprecedented electrical and magnetic properties that arise from the symmetry of the nano-structured materials. Spherical symmetry, which corresponds to the highest degree of geometrical symmetry, is naturally present in atoms. A high degree of degeneracy, a property of quantum energy levels wherein a particular energy level can simultaneously correspond to two or more distinct states in a quantum system, is a fascinating phenomenon that frequently results from symmetry. The maximum geometrical symmetry is seen in spherical atoms, which also exhibit a high number of quantum states, or degeneracy. It has long been thought that geometrical restrictions prevent any polyatomic species from growing larger than a sphere. An inflated tetrahedron, however, displays an unusual degeneracy that surpasses that of spherical atoms. It is possible to create nanomaterials with a higher degree of symmetry than spherical atoms. This dynamical symmetry produces super-degenerate quantum states that could be used to create new materials with unheard-of conductivity or magnetic properties, ushering in the next generation of electronic devices.

Prof. Dr. Sung-Chul Yi
Dr. Bradha Madhavanh
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nanomaterials
  • symmetry
  • structural studies
  • sub-atomic level
  • microstructure

Published Papers (3 papers)

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Research

16 pages, 5040 KiB  
Article
Application of Graphene Oxide–Natural Polymer Composite Adsorption Materials in Water Treatment
by
Jiliang Xie
Symmetry 2023, 15(9), 1678; https://doi.org/10.3390/sym15091678 - 31 Aug 2023
Viewed by 470
Abstract
Graphene is a new type of carbon material with excellent properties that has been developed in recent years. Graphene composites have potential application value in solving the problem of water pollution. In this study, we investigated the properties and performance of graphene composites [...] Read more.
Graphene is a new type of carbon material with excellent properties that has been developed in recent years. Graphene composites have potential application value in solving the problem of water pollution. In this study, we investigated the properties and performance of graphene composites prepared through polymer modification and inorganic particle doping modification. Our research focused on the composites’ ability to adsorb heavy metal ions and degrade organic compounds through photocatalysis. In this study, we prepared graphene oxide (GO) first and then grafted p-phenylenediamine onto its surface. The process was successful and yielded promising results. The aniline grafted onto the graphene oxide surface was used as anchor point for the in situ redox polymerization of aniline, and a polyaniline macromolecular chain was grafted onto the edge of graphene oxide. The structure of the composite was determined using Fourier transform infrared spectroscopy, thermogravimetry, X-ray diffraction, and Raman spectroscopy and transmission electron microscopy. The adsorption performance of Pb+ on GO-PANI composite was studied. The maximum adsorption capacity of the GO-PANI composite for Pb+ is 1416 mg/g, 2.3 times that of PANI. Graphene/polyaniline composites can be used as an excellent adsorbent for Pb2+ heavy metal ions and have great application prospects in heavy metal wastewater treatment. Full article
(This article belongs to the Special Issue Applications of Nanomaterials Beyond the Boundaries of Symmetry)
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13 pages, 5813 KiB  
Article
Computational, Investigational Explorations on Structural, Electro-Optic Behavior of Pelargonidin Organic Colorant for TiO2 Based DSSCs
by
Satish Kumar Palanisamy
,
Arun Kumar Udayakumar
,
Azher M. Abed
,
Parthasarathy Panchatcharam
,
Suvitha Athisaya Rajah
,
Bradha Madhavan
and
Ananth Steephen
Symmetry 2023, 15(1), 22; https://doi.org/10.3390/sym15010022 - 22 Dec 2022
Cited by 2 | Viewed by 1402
Abstract
In an expedition for green-energy generation and to lower the cost per watt of solar energy, environmentally friendly biotic colorants were separated from Tectona grandis seeds. The prime colorant in the extract is pelargonidin which sensitizes titanium dioxide (TiO2)-based photo anodes. [...] Read more.
In an expedition for green-energy generation and to lower the cost per watt of solar energy, environmentally friendly biotic colorants were separated from Tectona grandis seeds. The prime colorant in the extract is pelargonidin which sensitizes titanium dioxide (TiO2)-based photo anodes. The pelargonidin-sensitized TiO2 nanomaterials endured structural, photosensitive, spectral and current-voltage interpretations. Frontier molecular orbital analysis, physicochemical and electronic parameter computation, UV–visible and DOS spectral analysis, van der Waals prediction and molecular electrostatic potential map were performed theoretically with Gaussian tools, and IR symmetry response was computed using the crystal maker software package. The pelargonidin-sensitized TiO2-created dye-sensitized solar cells which exhibited capable solar light energy to photon conversion proficiency. For comparative purposes, the commercial P25 Degussa TiO2-based DSSC was also fabricated and its proficiency was analyzed. The commercial TiO2 exhibited 57 % higher proficiency in comparison to the sol-gel-derived TiO2-based DSSC. Full article
(This article belongs to the Special Issue Applications of Nanomaterials Beyond the Boundaries of Symmetry)
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10 pages, 2927 KiB  
Article
Durable, Low-Cost, and Efficient Heat Spreader Design from Scrap Aramid Fibers and Hexagonal Boron Nitride
by
Jung-Hun Yoo
and
Sung Chul Yi
Symmetry 2022, 14(12), 2597; https://doi.org/10.3390/sym14122597 - 08 Dec 2022
Viewed by 830
Abstract
Aramid, chemically known as para phenylene terephthalamide or PPD-T, has been widely used in the reinforcement of telecommunication cables, rubber materials (transmission belts, pneumatic belts), ballistic clothing, and frictional materials primarily due to their high tensile resistance, high elastic modulus, and excellent thermal [...] Read more.
Aramid, chemically known as para phenylene terephthalamide or PPD-T, has been widely used in the reinforcement of telecommunication cables, rubber materials (transmission belts, pneumatic belts), ballistic clothing, and frictional materials primarily due to their high tensile resistance, high elastic modulus, and excellent thermal stability (−80–200 °C). These unique properties of aramid originate from its chemical structure, which consists of relatively rigid polymer chains linked by benzene rings and amide bonds (-CO-NH-). Here, in this work inspired by these properties, a heat spreader called Thermal Interface Material (TIM) is developed by synthesizing a resin from scrap aramid fibers. When hexagonal boron nitride (h-BN) as filler is introduced into the as-synthesized aramid resin to form a thin film of thermal sheet (50 μm), an in-plane thermal conductivity as high as 32.973 W/mK is achieved due to the firmly stacked and symmetric arrangement of the h-BN in the resin matrix. Moreover, the influence of h-BN platelet size is studied by fabricating thermal sheets with three different sizes of h-BN (6–7.5 μm, 15–21 μm, and 30–35 μm) in the aramid resin. The results of the study show that as platelet size increases, thermal conductivity increases significantly. Since the resin reported herein is developed out of scrap aramid fibers, the cost involved in the manufacture of the thermal sheet will be greatly lower. As the thermal sheet is designed with h-BN rather than graphene or carbonaceous materials, this high heat spreading sheet can be employed for 5G antenna modules where properties like a low dielectric constant and high electrical insulation are mandated. Full article
(This article belongs to the Special Issue Applications of Nanomaterials Beyond the Boundaries of Symmetry)
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