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Journal articles on the topic 'Melem'

Author: Grafiati

Published: 5 June 2025

Last updated: 24 June 2025

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1

Wirnhier, Eva, Maria B. Mesch, Jürgen Senker, and Wolfgang Schnick. "Formation and Characterization of Melam, Melam Hydrate, and a Melam-Melem Adduct." Chemistry - A European Journal 19, no. 6 (2012): 2041–49. http://dx.doi.org/10.1002/chem.201203340.

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2

Liu, Hu, Mengqi Shen, Peng Zhou, et al. "Linking melem with conjugated Schiff-base bonds to boost photocatalytic efficiency of carbon nitride for overall water splitting." Nanoscale 13, no. 20 (2021): 9315–21. http://dx.doi.org/10.1039/d1nr01940f.

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The g-C<sub>x</sub>N<sub>4</sub>-based photocatalyst with melem rings conjugated by Schiff-base bonds, in which the melem rings and Schiff-base bonds act as oxidizing and reducing centers, respectively, achieves record-high overall water splitting photocatalysis.

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3

Saplinova, Tatyana, Christian Lehnert, Uwe Böhme, Jörg Wagler, and Edwin Kroke. "Melem- and melamine-derived iminophosphoranes." New Journal of Chemistry 34, no. 9 (2010): 1893. http://dx.doi.org/10.1039/b9nj00621d.

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4

Walczak, Michał, Marcin Lemanowicz, Krzysztof Dziuba, and Robert Kubica. "A Study on Byproducts in the High-Pressure Melamine Production Process." Materials 16, no. 17 (2023): 5795. http://dx.doi.org/10.3390/ma16175795.

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The industrial production of melamine is carried out by the thermal decomposition of urea in two technological processes, using high or low pressure. The reaction may be accompanied by the formation of undesirable byproducts, oxoaminotriazines, and so-called polycondensates, mainly melam, melem, and melon, as well as their hydrates and adducts. Their presence leads to the deterioration of the quality of the final product and may lead to the release of troublesome deposits inside the apparatus of the product’s separation node. With the limited possibility of controlling the crystallization of the byproducts of the process, improving the technological process requires the precise determination of the composition of the separated insoluble reaction byproducts, which is the main objective of this work. This work presents the results of qualitative and quantitative analyses of the composition of deposits sampled in the technological process of melamine production. The full characterization of the deposits was performed using inductively coupled plasma optical emission spectroscopy (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS) techniques. The elemental analysis (EA) of carbon, hydrogen, and nitrogen allowed us to obtain characteristic C/H, C/N, and H/N ratios. X-ray diffraction (XRD) and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy were also performed to confirm the obtained data. In addition, the morphology of the solid byproducts of the reaction was investigated, and the characteristics of the structures were determined using a scanning electron microscope. The elemental composition was investigated using scanning electron microscopy and the energy-dispersive X-ray spectroscopy (SEM-EDS) technique. The key finding of this research is that about 95% of the deposits are a mixture of melem and melem hydrate. The soluble part of the deposits contains melamine, urea, and oxyaminotriazines, as well as trace inorganic impurities.

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5

Sukul, Pradip Kumar, Puspendu Das, Gopal Lal Dhakar, Lalmohan Das, and Sudip Malik. "Effect of Tricarboxylic Acids on the Formation of Hydrogels with Melem or Melamine: Morphological, Structural and Rheological Investigations." Gels 8, no. 1 (2022): 51. http://dx.doi.org/10.3390/gels8010051.

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Herein, aggregation behaviors of melem or melamine in the presence of three symmetric carboxylic acids (1,3,5-tris(4-carboxyphenyl)benzene (TPCA), 1,3,5-benzene-tri-carboxylic acid (BTA) and 1,3,5-cyclohexane-tri-carboxylic acid (CHTA)) have been performed to check the influence of acid on the formation of aggregated structures which have been investigated by optical microscopy, FESEM, FTIR, XRD and viscoelastic properties have been explored with rheological studies. Interestingly, melem, that has limited solubility in aqueous medium, forms aggregation that leads to the formation of hydrogels with TPCA. More significantly, hydrogel is formed here by matching the size selectivity. Melem forms hydrogel with only large tricarboxylic acid, whereas melamine produces hydrogel with any kind of its counterpart from small to large tricarboxylic acid derivatives. Present investigations and results provide the strategy of design of organic self-assembled materials having two component systems.

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6

Zheng, H. B., W. Chen, H. Gao, et al. "Melem: an efficient metal-free luminescent material." J. Mater. Chem. C 5, no. 41 (2017): 10746–53. http://dx.doi.org/10.1039/c7tc02966g.

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7

Bayat, Elaheh, Markus Ströbele, David Enseling, Thomas Jüstel, and Hans-Jürgen Meyer. "MnCl2(C6N10H6): Insights into a Luminescent Transition Metal–Melem Complex." Molecules 29, no. 23 (2024): 5598. http://dx.doi.org/10.3390/molecules29235598.

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In this work, the (MnCl2(C6N10H6) complex has been synthesized via solid-state reaction between manganese (II) chloride and melamine in the molar ratio of 1:2. A similar synthesis has been repeated with CoCl2, and FeCl2, resulting in two new metal–melam complexes (FeCl2(C6N11H9) and CoCl2(C6N11H9)). MnCl2(C6N10H6) crystallizes in the monoclinic crystal system with the space group I2/a. The crystalline powder of MnCl2(C6N10H6) was studied by X-ray diffraction, infrared spectroscopy, and thermogravimetric analysis to examine its structure and properties. MnCl2(C6N10H6) also shows good thermal stability up to 370 °C; however, the complete decomposition occurred at 900 °C, yielding Mn7C3. This paper presents an easy synthesis of the first luminescent transition metal–melem complex, providing new insights into the reactivity of melamine at elevated temperatures in the presence of transition metal chlorides.

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8

Wang, Yang, Niannian Wu, Congyan Liu, et al. "Stimuli-responsive anisotropic actuation of melem-formaldehyde polymer." Materials Horizons 7, no. 1 (2020): 149–56. http://dx.doi.org/10.1039/c9mh00521h.

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9

Pantano, Fernando R., and Mariana I. Rojas. "First-principles studies of melem/carbonaceous interfaces." Computational Materials Science 237 (March 2024): 112883. http://dx.doi.org/10.1016/j.commatsci.2024.112883.

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10

Wei, Xiaoqing, Yu Qiu, Weiyuan Duan, and Zhengxin Liu. "Correction: Cathodic and anodic photocurrents generation from melem and its derivatives." RSC Advances 5, no. 40 (2015): 31656. http://dx.doi.org/10.1039/c5ra90032h.

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11

Martin, David, Martin Prostredný, and Ashleigh J. Fletcher. "Effect of Aromatic Amines on the Properties of Formaldehyde-Based Xerogels." Gels 6, no. 1 (2020): 8. http://dx.doi.org/10.3390/gels6010008.

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This study investigates the synthesis of formaldehyde-based xerogels using alternative aromatic precursors, with comparison to traditional resorcinol-formaldehyde analogues, in order to alter the chemical composition of the resulting gels. By replacing resorcinol with aromatic amine molecules, i.e., ammeline, melamine and melem, each expected to undergo similar reactions with formaldehyde as the substituted species, we found that for all substituted gels, at low additive contents, the gel structure was compromised and non-porous materials were formed, as opposed to the most abundant monomers, and therefore, these additives seem to act as impurities at low levels. Working towards higher additive contents, melem monomers exhibited low solubility (~5%), even at elevated temperatures, thereby limiting the range to which melem could act as a substitute, while melamine could be incorporated up to ~40% under acidic conditions, with enhanced microporosity over this range. Pure gels were successfully synthesised from ammeline, but their performance was inferior to resorcinol-formaldehyde gels, while melamine-formaldehyde analogues required acidic reaction conditions but shrank considerably on sub-critical drying, adversely affecting the gel properties and demonstrating their lack of potential as sorbents. This demonstrates the potential for the inclusion of aminated aromatics within resorcinol-based gel systems, however, only as partial substitutes and not complete replacements.

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12

Wen, Jing, Ruiyu Li, Rong Lu, and Anchi Yu. "Photophysics and Photocatalysis of Melem: A Spectroscopic Reinvestigation." Chemistry - An Asian Journal 13, no. 8 (2018): 1060–66. http://dx.doi.org/10.1002/asia.201800186.

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13

Minamide, Hiroki, Taiki Yamazaki, Hiroki Kiuchi, Rena Moue, Yoriko Sonoda, and Kaname Kanai. "Near-ultraviolet organic light emitting diodes using melem." Chemical Physics Letters 815 (March 2023): 140367. http://dx.doi.org/10.1016/j.cplett.2023.140367.

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14

Lei, Renbo, Bingsheng Du, Xiaofang Lai, et al. "Single-crystalline melem (C6N10H6) nanorods: a novel stable molecular crystal photocatalyst with modulated charge potentials and dynamics." Journal of Materials Chemistry A 7, no. 21 (2019): 13234–41. http://dx.doi.org/10.1039/c9ta02556a.

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Here we reported single-crystalline molecular crystal melem nanorods with modulated charge potentials and dynamics due to the high-crystallinity and low-dimensionality facilitating transport of photo-induced carriers.

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15

Nikookar, Mahsa, Abdolreza Rezaeifard, Maasoumeh Jafarpour, Kirill V. Grzhegorzhevskii, and Alexander A. Ostroushko. "A top-down design for easy gram scale synthesis of melem nano rectangular prisms with improved surface area." RSC Advances 11, no. 61 (2021): 38862–67. http://dx.doi.org/10.1039/d1ra07440g.

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A novel practical method for the gram scale preparation of melem possessing a nano rectangular prism morphology and improved specific surface area through a top-down depolymerization design was developed.

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16

Xia, Jiawei, Neeta Karjule, Biswajit Mondal, et al. "Design of melem-based supramolecular assemblies for the synthesis of polymeric carbon nitrides with enhanced photocatalytic activity." Journal of Materials Chemistry A 9, no. 33 (2021): 17855–64. http://dx.doi.org/10.1039/d1ta05450c.

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A new family of melem-based supramolecular assemblies coupled with small molecules is designed for polymeric carbon nitride (CN) synthesis, exhibiting state-of-the-art photocatalytic activity for hydrogen evolution and CO2 reduction reactions.

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17

Xia, Jiawei, Gabriel Mark, Michael Volokh, et al. "Supramolecular organization of melem for the synthesis of photoactive porous carbon nitride rods." Nanoscale 13, no. 46 (2021): 19511–17. http://dx.doi.org/10.1039/d1nr06974h.

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Well-ordered porous carbon nitride rods are designed from a supramolecular assembly of large melem molecules as the monomer. It exhibits excellent photocatalytic performance in H2 evolution and CO2 reduction with good stability and selectivity.

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18

Zhuo, Zesheng, Yajie Jiao, Lichan Chen, et al. "Ultra-high quantum yield ultraviolet fluorescence of graphitic carbon nitride nanosheets." Chemical Communications 55, no. 100 (2019): 15065–68. http://dx.doi.org/10.1039/c9cc07448a.

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Small-sized graphitic carbon nitride nanosheets (CNNs) have been prepared to exhibit an ultra-high quantum yield (80.1%) ultraviolet fluorescence, which was proved to have originated from the abundant isolated melem units on the edge of CNNs.

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19

Chu, Sheng, Cuicui Wang, Jianyong Feng, Ying Wang, and Zhigang Zou. "Melem: A metal-free unit for photocatalytic hydrogen evolution." International Journal of Hydrogen Energy 39, no. 25 (2014): 13519–26. http://dx.doi.org/10.1016/j.ijhydene.2014.02.052.

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20

Sattler, Andreas, and Wolfgang Schnick. "Zur Kenntnis der Kristallstruktur von Melem C6N7(NH2)3." Zeitschrift für anorganische und allgemeine Chemie 632, no. 2 (2006): 238–42. http://dx.doi.org/10.1002/zaac.200500363.

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21

Kessler, Fabian K., Asbjörn M. Burow, Gökcen Savasci, et al. "Structure Elucidation of a Melam–Melem Adduct by a Combined Approach of Synchrotron X‐ray Diffraction and DFT Calculations." Chemistry – A European Journal 25, no. 35 (2019): 8415–24. http://dx.doi.org/10.1002/chem.201901391.

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22

Hoang, Thi Van Anh, Phuong Anh Nguyen, and Eun Woo Shin. "Effect of Morphological Modification over g-C3N4 on Photocatalytic Hydrogen Evolution Performance of g-C3N4-Pt Photocatalysts." Catalysts 13, no. 1 (2023): 92. http://dx.doi.org/10.3390/catal13010092.

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In this study, the morphological properties of g-C3N4 in g-C3N4-Pt photocatalysts were modified by a simple hydrothermal treatment for photocatalytic hydrogen evolution. In addition, the morphological modification effect of g-C3N4 on the hydrogen evolution performance was investigated. The long-time hydrothermal treatment clearly changed the morphology of g-C3N4 by building extended melem units with more oxygen functional groups at the defect edges of the extended melem units, which was evidenced by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) measurements. The different morphological features of g-C3N4 resulted in lower photoluminescence (PL) emission intensity in PL spectra and a smaller semicircle radius in electrochemical impedance spectroscopy (EIS) data. This indicates the more efficient charge separation of the g-C3N4-Pt photocatalyst with a modified morphology. Consequently, morphologically modified g-C3N4-Pt showed a higher photocatalytic hydrogen evolution rate due to the better charge separation efficiency.

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23

Hsu, Chu-Yen, and Kao-Shuo Chang. "Fabrication and Photocatalytic Application of Aromatic Ring Functionalized Melem Oligomers." Journal of Physical Chemistry C 122, no. 6 (2018): 3506–12. http://dx.doi.org/10.1021/acs.jpcc.7b12539.

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24

Wei, Xiaoqing, Yu Qiu, Weiyuan Duan, and Zhengxin Liu. "Cathodic and anodic photocurrents generation from melem and its derivatives." RSC Advances 5, no. 34 (2015): 26675–79. http://dx.doi.org/10.1039/c5ra02816g.

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25

Sattler, Andreas, Sandro Pagano, Martin Zeuner, et al. "MelamineâMelem Adduct Phases: Investigating the Thermal Condensation of Melamine." Chemistry - A European Journal 15, no. 47 (2009): 13161–70. http://dx.doi.org/10.1002/chem.200901518.

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26

Saepudin, Asep, and Ela Yulaeliah. "The Jaipongan Drumming Strokes in Lagu Gedé in Sundanese Gamelan." Harmonia: Journal of Arts Research and Education 21, no. 1 (2021): 43–59. http://dx.doi.org/10.15294/harmonia.v21i1.28206.

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This paper aims to describe the Jaipongan drumming strokes in Lagu Gedé. Lagu Gedé is a type of song in Sundanese Karawitan that has a large embat (rhythm). This song includes a dish of drums vocals accompanied by gamelan pelog-salendro with characteristics that have tone, barrel, surupan, embat, gending, slow tempo, embat opat wilet, and bound by the standard rules. Observations were made by appreciating Jaipongan’s performances in Bandung and Karawang. Besides, the author conducts interviews with several primary informants who are directly involved in the arrangement of Jaipongan. Gedé’s point here is to look at it with a smooth, soft, slow serving. The Kiliningan genre has a specific punch motif name for Gede’s song. The name of this variation is called tepak melem. Melem has a delicious or gentle meaning. Tepak melem to accompany Sekar Gending songs in Kiliningan genre. The phenomenon that happens that Lagu Gede is served in Kiliningan dish and used to attend Jaipongan dance. When Jaipongan’s work uses Gedé’s song, it generates innovations. Gedé’s song is no longer presented with a glued drum but with a tepak diteunggeul. Diteunggeul contains the meaning of being hit hard, powerful, dynamic, and fast. This research concluded that jaipongan drumming strokes in Lagu Gedé is realized that drummers and dancers must explore many spaces because it has the freedom to work. After all, they present it in an embat opat wilet (big rhythm). This affects the widening of the number of beats, the position of kenongan, pancer, and gongan. Artists have the freedom to do creativity in working on Gede’s songs. The space of artists in their work can ultimately foster new creativity that impacts the growth and development of Sundanese karawitan.

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27

Hoang, Thi Van Anh, Phuong Anh Nguyen, Won Mook Choi, and Eun Woo Shin. "The Growth of Extended Melem Units on g-C3N4 by Hydrothermal Treatment and Its Effect on Photocatalytic Activity of g-C3N4 for Photodegradation of Tetracycline Hydrochloride under Visible Light Irradiation." Nanomaterials 12, no. 17 (2022): 2945. http://dx.doi.org/10.3390/nano12172945.

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In this work, the growth of extended tri-s-triazine units (melem units) on g-C3N4 (CN) by hydrothermal treatment and its effect on the photodegradation efficiency of tetracycline hydrochloride (TC) is investigated. The CN-180-x and CN-200-6 samples were prepared using different hydrolysis times and temperatures, and they were characterized by multiple physicochemical techniques. In addition, their photodegradation performance was evaluated under visible light irradiation. Compared to the CN, CN-180-6 possesses remarkable photocatalytic degradation efficiency at 97.17% towards TC removal in an aqueous solution. The high visible-light-induced photo-reactivity of CN-180-6 directly correlates to charge transfer efficiency, numerous structural defects with a high specific surface area (75.0 m2 g−1), and sufficient O-functional groups over g-C3N4. However, hydrothermal treatment at a higher temperature or during a longer time additionally induces the growth of extended melem units on the surface of g-C3N4, resulting in the inhibition of the charge transfer. In addition, the superoxide radical is proven to be generated from photoexcited reaction and plays a key role in the TC degradation.

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28

Chen, Xihai, Chaofeng Zhu, and Bo Liu. "Fluorescence enhancement induced by sulfuric acid intercalation on melem-based polymer." Inorganic Chemistry Communications 142 (August 2022): 109600. http://dx.doi.org/10.1016/j.inoche.2022.109600.

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29

Huang, Chaoning, Shizheng Zhang, Mengfan Wang, et al. "Construction of melem/g-C3N4/vermiculite hybrid photocatalyst with sandwich structure." Applied Clay Science 213 (November 2021): 106242. http://dx.doi.org/10.1016/j.clay.2021.106242.

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30

Ugolotti, Aldo, and Cristiana Di Valentin. "Ab-Initio Spectroscopic Characterization of Melem-Based Graphitic Carbon Nitride Polymorphs." Nanomaterials 11, no. 7 (2021): 1863. http://dx.doi.org/10.3390/nano11071863.

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Polymeric graphitic carbon nitride (gCN) compounds are promising materials in photoactivated electrocatalysis thanks to their peculiar structure of periodically spaced voids exposing reactive pyridinic N atoms. These are excellent sites for the adsorption of isolated transition metal atoms or small clusters that can highly enhance the catalytic properties. However, several polymorphs of gCN can be obtained during synthesis, differing for their structural and electronic properties that ultimately drive their potential as catalysts. The accurate characterization of the obtained material is critical for the correct rationalization of the catalytic results; however, an unambiguous experimental identification of the actual polymer is challenging, especially without any reference spectroscopic features for the assignment. In this work, we optimized several models of melem-based gCN, taking into account different degrees of polymerization and arrangement of the monomers, and we present a thorough computational characterization of their simulated XRD, XPS, and NEXAFS spectroscopic properties, based on state-of-the-art density functional theory calculations. Through this detailed study, we could identify the peculiar fingerprints of each model and correlate them with its structural and/or electronic properties. Theoretical predictions were compared with the experimental data whenever they were available.

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31

Zheng, Huibin, Zhengui Zhao, Jonathan B. Phan, et al. "Highly Efficient Metal-Free Two-Dimensional Luminescent Melem Nanosheets for Bioimaging." ACS Applied Materials & Interfaces 12, no. 2 (2019): 2145–51. http://dx.doi.org/10.1021/acsami.9b19915.

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32

Nataf, Valérie, Pascale Mercier, Béatrice De Néchaud, et al. "Melanoblast/Melanocyte Early Marker (MelEM) Is a Glutathione S-Transferase Subunit." Experimental Cell Research 218, no. 1 (1995): 394–400. http://dx.doi.org/10.1006/excr.1995.1171.

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33

HUANG, Lili, and Xiang SHAO. "CO Induced Single and Multiple Au Adatoms Trapped by Melem Self-Assembly." Acta Physico-Chimica Sinica 34, no. 12 (2018): 1390–96. http://dx.doi.org/10.3866/pku.whxb201804191.

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34

Zhang, Yuanping, Hongguang Liang, Xiaoyun Li, Qifeng Li, and Junwei Wang. "Melem based mesoporous metal-free catalyst for cycloaddition of CO2 to cyclic carbonate." Journal of CO2 Utilization 64 (October 2022): 102173. http://dx.doi.org/10.1016/j.jcou.2022.102173.

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35

Song, Xianghai, Yuanfeng Wu, Donghui Pan, et al. "Melem based multifunctional catalyst for chemical fixation of carbon dioxide into cyclic carbonate." Journal of CO2 Utilization 24 (March 2018): 287–97. http://dx.doi.org/10.1016/j.jcou.2018.01.017.

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36

Sattler, Andreas, and Wolfgang Schnick. "Preparation and Structure of Melemium Melem Perchlorate HC6N7(NH2)3ClO4·C6N7(NH2)3." Zeitschrift für anorganische und allgemeine Chemie 634, no. 3 (2008): 457–60. http://dx.doi.org/10.1002/zaac.200700447.

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37

Sattler, Andreas, and Wolfgang Schnick. "Melemium Hydrogensulfate H3C6N7(NH2)3(HSO4)3 - the First Triple Protonation of Melem." Zeitschrift für anorganische und allgemeine Chemie 636, no. 15 (2010): 2589–94. http://dx.doi.org/10.1002/zaac.201000246.

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38

Liu, Shizhen, Hongqi Sun, Kane O’Donnell, H. M. Ang, Moses O. Tade, and Shaobin Wang. "Metal-free melem/g-C 3 N 4 hybrid photocatalysts for water treatment." Journal of Colloid and Interface Science 464 (February 2016): 10–17. http://dx.doi.org/10.1016/j.jcis.2015.11.003.

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39

Larsen, Finn Krebs, Aref Hasen Mamakhel, Jacob Overgaard, Jens-Erik Jørgensen, Kenichi Kato, and Bo Brummerstedt Iversen. "Accessing the rich carbon nitride materials chemistry by heat treatments of ammonium thiocyanate, NH4SCN." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 75, no. 4 (2019): 621–33. http://dx.doi.org/10.1107/s2052520619005791.

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Carbon nitride materials include functional materials, and their chemical diversity and complexity are becoming increasingly appreciated. Heating of NH4SCN leads to a range of new carbon nitride compounds, which have been structurally characterized by single-crystal X-ray diffraction. Heating at ambient pressure to 175°C leads to guanidinium thiocyanate, H6CN3SCN (1), and when maintaining that temperature for about 12 h a water-insoluble carbon nitride product is formed, which is a co-crystal between melamine and melamium thiocyanate, [H6C3N6]·[H10C6N11]+·[SCN]− (2). In situ powder X-ray diffraction measurements of this material reveal a gradual transformation from (2), via two intermediate products, to a final melon-like end product. The first of these forms between 350 and 400°C, and is an adduct of melam and melamium thiocyanate, [H9C6N11]·2[H10C6N11]+·2[SCN]− (3). The second forms between 400 and 480°C, and is identified as melem, 2,5,8-triamino-tri-s-triazine, H6C6N10 (4). On heating of (2) in a sealed ampoule to 600°C, various crystals were obtained and six crystal structures were determined from the batch: 1,3,5-triazine-2,4,6-triamino, H6C3N6 (5), 1,3,5-triazine-2,4-diamino, H5C3N5 (6), 1,1′,3,3′,5,5′-triazine-2,2′,4,4′-tetraamino, H8C6N10 (7), 2[H6C3N6]·[H10C6N11]+·[SCN]− (8) and 2[H6C3N6]·[H7C3N6]+·[SCN]− (9). Finally, a recrystallized decomposition product was found to be [H6C3N6]·[H7C3N6]+·[SCN]−·[H2O] (10).

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40

Chang, Xinye, Huiqing Fan, Lin Lei, Xiaobo Wu, Weijia Wang, and Longtao Ma. "Generation Mechanism of the Defects in g-C3N4 Synthesized in N2 Atmosphere and the Method for Improving Photocatalysis Activity." Catalysts 13, no. 2 (2023): 269. http://dx.doi.org/10.3390/catal13020269.

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One of the most important methods for modifying semiconductors is defect engineering, but only the right quantity of defects in the right chemical environment can produce desirable results. Heat treatment processes associated with g-C3N4 are occasionally carried out in N2 atmosphere, however, the catalytic performance of g-C3N4 produced by direct condensation of only nitrogen-rich precursors in N2 atmosphere is often unsatisfactory. This is typically attributed to the introduction of numerous defects, but the actual relationship between the formation of defects and the N2 atmosphere is rarely explained, and the resulting quantity of defects is difficult to control. We propose that the melam to melem transition is restricted due to the lack of O2 during the heat treatment of the nitrogen-rich precursor of g-C3N4 in N2 atmosphere, which leads to a substantial quantity of defects in the synthesized g-C3N4. To enhance its photocatalytic property, we propose a method to reduce the quantity of defects due to calcinating in N2 atmosphere by protonating the precursor in a way that increases the polymerization of the product. The test analysis indicated that only a moderate quantity of defects that contribute to electron excitation and enhance the separation efficiency and density of photogenerated carriers were retained, and the hydrogen evolution performance of the prepared catalyst was significantly improved.

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41

Ding, Hui, Yuting He, Jing Ding, Hui Wan, and Guofeng Guan. "Riveting Hydroxyl Ionic Liquids onto Melem Oligomers for CO 2 Cycloaddition into Cyclic Carbonates." ChemistrySelect 6, no. 12 (2021): 2951–58. http://dx.doi.org/10.1002/slct.202100336.

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42

Han, Dong, Xue-Jiao Chen, Hai Xu, et al. "Stretch/Compress‐Modulated Spin Splitting in One‐Dimensional Melem Chain with a Helical Structure." physica status solidi (RRL) – Rapid Research Letters 13, no. 10 (2019): 1900294. http://dx.doi.org/10.1002/pssr.201900294.

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WANG, Li, He-Xia SHI, Wen-Yuan WANG, Hong SHI, and Xiang SHAO. "Identifying the Hydrogen Bonding Patterns of Melamine and Melem Self-Assemblies on Au(111) Surface." Acta Physico-Chimica Sinica 33, no. 2 (2017): 393–98. http://dx.doi.org/10.3866/pku.whxb201611033.

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Yi, Yuhui, Jie Wang, Yingli Niu, Yu Yu, Songmei Wu, and Kejian Ding. "Exploring the evolution patterns of melem from thermal synthesis of melamine to graphitic carbon nitride." RSC Advances 12, no. 37 (2022): 24311–18. http://dx.doi.org/10.1039/d2ra03337b.

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Li, Xieyin, Yuqian Zhang, Mian Wei, Manman Wang, Jing Wang, and Guifu Zuo. "A rod-like melem with high fluorescence quantum yield for sensitive detection of reduced glutathione." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 282 (December 2022): 121709. http://dx.doi.org/10.1016/j.saa.2022.121709.

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Rani, Barkha, Arpan Kumar Nayak, and Niroj Kumar Sahu. "Degradation of mixed cationic dye pollutant by metal free melem derivatives and graphitic carbon nitride." Chemosphere 298 (July 2022): 134249. http://dx.doi.org/10.1016/j.chemosphere.2022.134249.

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Uemura, Shinobu, Masashi Aono, Kenki Sakata, Tamikuni Komatsu, and Masashi Kunitake. "Thermodynamic Control of 2D Bicomponent Porous Networks of Melamine and Melem: Diverse Hydrogen-Bonded Networks." Journal of Physical Chemistry C 117, no. 47 (2013): 24815–21. http://dx.doi.org/10.1021/jp406810c.

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Leng, Yan, Chenjun Zhang, Bing Liu, Miaomiao Liu, Pingping Jiang, and Sheng Dai. "Synergistic Activation of Palladium Nanoparticles by Polyoxometalate-Attached Melem for Boosting Formic Acid Dehydrogenation Efficiency." ChemSusChem 11, no. 19 (2018): 3396–401. http://dx.doi.org/10.1002/cssc.201801521.

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Mullemani Channappa, Shanmukha, Shilpa Kalajji Channabasappa, Usha Arcot, and Anil Kumar Kempasidpla Nagarajappa. "GENERALIZED REDEFINED ZAGREB INDEX ON SOME NANOSTRUCTURES." Suranaree Journal of Science and Technology 30, no. 1 (2023): 030097(1–7). http://dx.doi.org/10.55766/sujst-2023-01-e01919.

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Abstract:

Chemical graph theory has become a significant part of the research. Topological indices are numerical descriptors used to determine physico-chemical properties of chemical compounds. In this work, the generalized redefined Zagreb index is defined. This index is applied on several topological indices viz., redefined Zagreb indices (ReZG1(G), ReZG2(G), ReZG3(G)), sum-connectivity Zagreb index (SCI(G)), hyper Zagreb index (HM(G)), harmonic index (H(G)), arithmetic-geometric index (AGI(G)), SK index (SK(G)) and SK1 index (SK1(G)). The above said indices are calculated for aromatic compounds such as boron triangular sheet, borophene chain and melem chain nanostructures. The obtained results are useful in understanding the behaviour of compounds under the study.

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Ożóg, Mariusz. "The mixture of hydroxymethyl derivatives of melem as potential component of intumescent coatings for fire protection." Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa 4 (2016): 295–308. http://dx.doi.org/10.16926/tiib.2016.04.24.

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