2020-07-12T12:29:35Z https://www.ajnanomat.com/?_action=export&rf=summon&issue=14181

2020-04-01

Asian Journal of Nanosciences and Materials Asian J. Nanosci. Mater. 2645-775X 2645-775X 2020 3 2 Fahd Khan Masakazu Sugiyama Katsushi Fujii Yoshiaki Nakano Electrochemical reduction of CO₂ is so important in mitigating the greenhouse related environmental concerns. Recently, oxidized forms of metals instead of pure metals have gained a great deal of attention due to the difference in product selection between the two classes of electrode materials. Since copper has been widely used in producing carbon-intensive products, various studies have been dedicated to evaluate its oxidized form. In this research study, we focused on using cuprous oxide particles supported on hydrophobic carbon paper substrate. The structure of the carbon paper provides unique reaction sites while the micron-sized particles can help to provide new insight about using smaller surface area to volume ratio as compared to previous reports on oxidized copper nanoparticles. Formic acid, ethylene, and CO were produced as a result of our experiments which show improved product selection compared with the pure copper nanoparticles. The potential and time dependence of these products are presented in this study along with a discussion on the origin of CO₂ reduction. CO2 reduction Electrocatalysis Cuprous oxide Ethylene Formic acid 2020 04 01 93 102 https://www.ajnanomat.com/article_96793_daba7a16c18ac67fa4f222ff5078b93a.pdf

2020-04-01

Asian Journal of Nanosciences and Materials Asian J. Nanosci. Mater. 2645-775X 2645-775X 2020 3 2 Mohammad Reza Jalali Sarvestani Roya Ahmadi In this research, the performance of the carbon nanocone as an adsorbent and a sensing material for the removal and detection of trinitrotoluene (TNT) was investigated using the density functional theory. The atomic structures of TNT and its complexes with carbon nanocone were optimized geometrically. Infra-red (IR) and frontier molecular orbital computations were employed to evaluate the interaction of TNT with the carbon nanocone. The obtained negative values of adsorption energies, Gibbs free energy changes, adsorption enthalpy variations and great values of thermodynamic equilibrium constants revealed that the interaction of the TNT with carbon nanocone was exothermic, spontaneous and experimentally feasible. The effect of the nitrogen doping and temperature on the adsorption process was also evaluated and the results indicated that TNT interaction with N-doped carbon nanocone was stronger than that of pristine one. In addition, 298 K was the optimum temperature for the adsorption process. The specific heat capacity values revealed that the heat sensitivity was declined tangibly after the TNT adsorption on the surface of carbon nanocone. Besides, the frontier molecular orbital parameters such as bandgap, electrophilicity, maximum transferred charge proved that the carbon nanocone could be utilized as an excellent sensing material for the construction of new electrochemical sensors for TNT determination. Some structural and energetic features were also discussed in details. TNT carbon Nanocone Adsorption Density functional theory explosives 2020 04 01 103 114 https://www.ajnanomat.com/article_101247_bdb5a8ed33429f4fee5274da237ea967.pdf

2020-04-01

Asian Journal of Nanosciences and Materials Asian J. Nanosci. Mater. 2645-775X 2645-775X 2020 3 2 Vijay L. Gurav Rajesh A. Samant Satish B. Manjare Urmila K. Patil Sana R. Solkar Shivani S. Moghe In this study, waste egg scale and inexpensive biowaste were employed to remove calcium ions. The potential of egg scales for removal of calcium ions from aqueous solutions was investigated. Preparation of calcinated egg shell powder, tulsi leaf extract, nanoparticle, and growth of bacteria were done to study biosynthesis of calcium oxide nanoparticle onto waste egg scales.<br /> Development of green nanotechnology has attracted a great deal of attention from researchers towards eco-friendly biosynthesis of nanoparticle. In this study, biosynthesis of stable calcium nanoparticles was conducted using tulsi (<em>Ocimum sanctum</em>) leaf extract. These biosynthesized nanoparticles were characterized using X-ray diffraction (XRD) analysis. The results revealed that, <em>O.sanctum</em> leaf extract can reduce Ca-ions into calcium oxide nanoparticles within 40 min of reaction time. It was found that, this method can be used for rapid and eco-friendly biosynthesis of stable calcium oxide nanoparticles with the size ranging from 40 to 70 nm. Calcium oxide Ocimum sanctum Antimicrobial activity 2020 04 01 115 120 https://www.ajnanomat.com/article_101257_71e44f0a7a4d96e1150f4e54cd506d14.pdf

2020-04-01

Asian Journal of Nanosciences and Materials Asian J. Nanosci. Mater. 2645-775X 2645-775X 2020 3 2 Nida S.Shaikh Rahimullah S.Shaikh Sahebrao Kashid This paper deals with the rapid photosensitized biosynthesis of silver nanoparticles using aqueous extract of flowers of Cascuta reflexa. The reaction was carried out in ambient sunlight. The mixing of aqueous solution of silver nitrate and the flower extract shows color transitions from yellow to light brown and finally dark brown colour, indicating the formation of silver nanoparticles. As synthesized the nanoparticles were characterized by various techniques such as UV visible spectroscopy, XRD, FT-IR, TEM. The TEM analysis revealed that the particles were predominantly spherical and size ranging from 20 to 50 nm. The antioxidant properties were tested by FR AP assay method. The antibacterial properties of synthesized Nanoparticles were tested against pathogens such. P.aeruginosa, E.coli, B. subtilus and S.aureus. Silver nanoparticles Photosensitized biosynthesis aqueous extract of flowers of Cascuta reflexa antimicrobial testing FRAP assay 2020 04 01 121 130 https://www.ajnanomat.com/article_102132_a7acbf3b2f2b19beadc6e573e41710ca.pdf

2020-04-01

Asian Journal of Nanosciences and Materials Asian J. Nanosci. Mater. 2645-775X 2645-775X 2020 3 2 Arezoo Pourkazemi Zahra Nasouri Fatemeh Fakhraie Alemeh Razzaghi Abolfath Parhami Abdolkarim Zare In this study, acidic ionic liquid <em>N</em>,<em> N</em>-diethyl-<em>N</em>-sulfoethanaminium hydrogen sulfate {[Et₃N-SO₃H]HSO₄} was utilized to promote two classes of useful organic transformations under solvent-free conditions including, <em>i</em>) the condensation of arylaldehydes with malononitrile and 1-naphthol, leading to 2-amino-4<em>H</em>-chromenes, and <em>ii</em>) the condensation reaction of arylaldehydes with 2-naphthol to give 14-aryl-14<em>H</em>-dibenzo[<em>a</em>,<em> j</em>]xanthenes. The ionic liquid efficiently catalyzed the reactions, and the products were obtained in excellent yields (94-98%) within short reaction times (8-30 min). Acidic ionic liquid N N-Diethyl-N-sulfoethanaminium hydrogen sulfate {[Et3N-SO3H]HSO4} 2-Amino-4H-chromene 14-Aryl-14H-dibenzo[a j]xanthene Solvent-free 2020 04 01 131 137 https://www.ajnanomat.com/article_102406_dbac66aee2c7bf493e78f6296f449441.pdf

2020-04-01

Asian Journal of Nanosciences and Materials Asian J. Nanosci. Mater. 2645-775X 2645-775X 2020 3 2 Masoud Kazem-Rostami Hybridization, functionalization, and enantioseparation of ethano-bridged Tröger base analogs have been performed. X-ray crystallographic analysis, chiral HPLC and CD spectroscopy have assigned the absolute configuration of the obtained ethano-bridged Tröger base analogs, confirming their optical purity. These optically active building blocks are readily modifiable and owing to their versatility they offer unique benefits for the growing community of molecular machinists. Tröger base Enantioseparation Nitrogen stereocenter Chiral discriminator 2020 04 01 138 147 https://www.ajnanomat.com/article_102820_ba28be315070bc0a2e1d52c2db91edbb.pdf

2020-04-01

Asian Journal of Nanosciences and Materials Asian J. Nanosci. Mater. 2645-775X 2645-775X 2020 3 2 Roya Afsharpour Sahar Zanganeh Sohaila Kamantorki Fatemeh Fakhraei Esmael Rostami In this work, activated carbon sulfonic acid was prepared from the reaction of activated carbon and chlorosulfonic acid in chloroform at reflux conditions and characterized using X-ray powder diffraction (XRD) spectrum, infra-red (IR) spectrum, field emission scanning electron microscopy <em>(</em>FE-SEM<em>)</em> images and energy dispersive X-ray spectroscopy (EDS). Benzimidazole was prepared in excellent yields through the multicomponent condensation reaction of 1,2-phenylenediamine with aryl aldehydes in the presence of sulfonic acid-functionalized activated carbon (AC-SO₃H), as an active catalyst, under solvent-free conditions. According to the optimized variables, the best reaction conditions for preparing benzimidazole were found to be: 0.02 gram of catalyst in solvent-free condition at 30 Min. and at 75 °C. To demonstrate the stability and durability of the catalyst, the yields of five successive runs with recovered catalyst were reported, showing no significant change in the obtained yields. Ultimately, the synthesis of benzimidazoles was achieved using an efficient, simple, environmentally benign, inexpensive and economic approach in the presence of AC-SO₃H catalyst. Activated carbon sulfonic acid catalyst Benzimidazole Solvent-free Green synthesis 2020 04 01 148 156 https://www.ajnanomat.com/article_103975_97fb64267e805d59e58dc2a00c27e8ca.pdf