Volume-14 ~ Issue-12 ~ December 2021

Abstract: Silver nanoparticles (AgNPs) were successfully developed by a simple chemical reduction method. The particles were synthesized via the reduction of silver nitrate by trisodium citrate and citrate is used as capping agent, stabilizing agent and reducing agent. The resulting AgNPs were characterized by UV-visible spectrophotometer and transmission electron microscopy (TEM). The result of TEM shows that AuNPs with sodium citrate have particle size of 44.04 nm (diameter) and have developing stability. The Result of UV- VIS shows that AuNPs with sodium citrate gives peak at 444 nm and single peak shows monodispercity..

Key worlds: silver nanoparticles, chemical reduction, sodium citrate, TEM, spectroscopy

[1]. K. M. M. Abou El-Nour, A. Eftaiha, A. Al-Warthan, R. A. A. Ammar, Synthesis and applications of silver nanoparticles. Arabian Journal of Chemistry. 3 (2010) 135–140.
[2]. Sharma, Virender K., Ria A. Yngard, and Yekaterina Lin. "Silver nanoparticles: green synthesis and their antimicrobial activities." Advances in colloid and interface science 145 (2009) 83-96.
[3]. Y A Krutyakov, A A Kudrynskiy, A Y Olenin, G V Lisichkin, Moss (Bryophyte) Mediated Synthesis and Characterization of Silver Nanoparticles from Campylopus flexuosus, Russ. Chem. Rev. 77 (2008) 233-257.
[4]. Ahamed, Maqusood, Mohamad S. AlSalhi, and M. K. J. Siddiqui. "Silver nanoparticle applications and human health." Clinica chimica acta 411(2010)1841-1848.

Abstract: Analogous ligands derived from salicylaldehyde, 2-[(2-hydroxyethylimino)ethyl]phenol (H2L1) and 2-[(2-hydroxyethylimino)methyl]phenol (H2L2), have been synthetized and used to prepare three complexes in which the ligands acts in different fashions. Complexes formulated as [Co2(L1)2(OCH2CH2NH2)(SCN)].(CH3CH2OH) (1) , {[Mn(HL2)2].Cl.(H2O)}n (2), and {[Cu(L2)(NO3)]}n (3) were synthesized by mixing an equimolar amount of an ethanol solution containing Co(NO3)2.6H2O, MnCl2.4H2O or Cu(NO3)2.2H2O and an ethanol solution containing the appropriate ligand H2L1 or H2L2. In the dinuclear cobalt(III) complex 1, each of......

Keywords: Crystal structure; cobalt; manganese; copper; polymeric; octahedral

[1]. S. Majumder, J.P. Naskar, A. Bhattacharya, R. Ganguly, P. Saha, S. Chowdhury, A new phenylimidorhenium(V) compound containing the 2-[(2-hydroxyethylimino)methyl]phenol Schiff-base ligand: experimental and theoretical aspects, J. Coord. Chem. 2015, 68, 599–615.
[2]. Y.M. Chumakov, V.L. Tsapkov, P.A. Petrenko, L.G. Popovski, Y.A. Simonov, G. Bocelli, B.Y. Antosyak, A.O. Paraschivescu, A.P. Gulea, Crystal structure of 4,4-bipyridine-containing complexes of copper(II) nitrate with 1-[(2-Hydroxyethylimino)methyl]naphthalen-2-ol and 2-[(2-hydroxyethylimino)methyl]phenol, Russian J. Coord. Chem., 2009, 35, 504–511
[3]. L.-F. Zhang, Z.-H. Ni, Z.-M. Zong, X.-Y. Wei, C.-H. Ge, H.-Z. Kou, A novel one-dimensional complex: catena-poly[[manganese(III)-di-μ-2-[(2-hydroxyethyl)iminomethyl]phenolato-κ2O1,N:κO2;κO2:κ2O1] chloride], Acta Crystallogr., Sect. C: Struct. Chem., 2015, 61, m542–m544.
[4]. J.-L. Hou, Y. Bi, Y.-H. Xiao, H.-Y. Wu, C.-B. Sun, W. Chen, Synthesis, X-ray crystal structures, and biological activity copper(II) and nickel(II) complexes derived from 5-bromo-2-((2-hydroxyethylimino)methyl)phenol, Inorg. Nano-Met. Chem., 2021, 51, 875–881.
[5]. Z.-L. You, J.-Y. Chi, {2-[2-(Ethylamino)ethyliminomethyl]phenol}{2-[2-(ethylamino)ethyliminomethyl]phenolato}nickel(II) perchlorate, Acta Crystallogr., Sect. E: Struct. Chem., 206, 62, m1498–m1500.

Abstract: Some modifiers, such as heavy pyrolysis resin, petroleum resins with functional groups (carboxyl and hydroxyl), sulfur, rubber crumb and complex modifier are capable to slow down the aging process in petroleum bitumen during pavement operation. In this work such abilities were compared. The objects of the study are BND 60/90 oxidized paving bitumen produced by PJSC "Ukrtatnafta" (Kremenchuk, Ukraine) and BD 130/200 residual bitumen obtained as a result of Orkhov oil refining at JSC "Ukrgazvydobuvannya" (Lviv, Ukraine), an entity of Naftogaz group. After heating the modified BND 60/90 bitumen by RTFOT method, the best results were observed for the samples modified with petroleum resins with hydroxyl groups, complex modifier and heavy pyrolysis resin. For BD 130/200 the best results were found for the samples with heavy pyrolysis resin and sulfur.

Key Words: Bitumen, Bitumen Aging, Oxidized Bitumen, Residual Bitumen, Pavement

[1]. Gunka V., Demchuk Yu., Sidun Iu. et al. Application of phenol-cresol-formaldehyde resin as an adhesion promoter for bitumen and asphalt concrete. Road Materials and Pavement Design. 2020:1-13. https://doi.org/10.1080/14680629.2020.1808518
[2]. Demchuk Yu., Gunka V., Sidun I., & Solodkyy S. (2020). Comparison of Bitumen Modified by Phenol Formaldehyde Resins Synthesized from Different Raw Materials. Proceedings of EcoComfort. 2020: 95–102. doi:10.1007/978-3-030-57340-9_12
[3]. Pyshyev S., Gunka V., Grytsenko Yu. and Bratychak Michael. Polymer Modified Bitumen: Review. Ch&ChT. 2016; Vol.10, No.4s. https://doi.org/10.23939/chcht10.04si.631
[4]. Gunka V., Prysiazhnyi Yu., Hrynchuk Yu., Sidun Iu., Demchuk Iu., Shyshchak O., Poliak O., Bratychak M. Production of Bitumen Modified with Low-Molecular Organic Compounds from Petroleum Residues. 3. Tar Modified with Formaldehyde. Ch&ChT. 2021; Vol.15, No.4. https://doi.org/10.23939/chcht15.04.608
[5]. Bratychak M., Grynyshyn O., Prysiazhnyi Yu., Pushak A. Oil Polymer Resins With Function Groups. Synthesis, Properties, Applications. 2016. Monograph. Publishing House Lviv Polytechnic, P.170

Abstract: Thermo physical properties can provide good information about the molecular interaction s between liquid mixtures. Ultrasonic studies and densities in binary liquid mixture of ethylamine and cyclo hexanol have been measured. Acoustic parameters like isentropic compressibility, intermolecular free length, available volume, molar volume, Nissan's parameter and their excess function have been calculated for this binary liquid mixture at 303.15K. The corresponding excess functions are a better measure of the extent of interactions present between the component molecules of the system. It is used in so many fields of scientific researches in physics , chemistry, biology, medicines and industry. These properties also provide important information about molecular packing, molecular motion and the chemical nature of the component molecules.

Key Words: Binary mixture, , Density, Viscosity, ethylamine, cyclo hexanol, Ultrasonic interferometer.

[1]. B.Thanuja,Charles Kanagam et al. Studies on intermolecular interactions on binary mixtures of methyl orange – water system. Excess molar functions of ultrasonic parameters at different temperatures. Journal of ultrasonics sonochemistry volume 18, 2011, 1274 – 1278 [2]. prediction of thermo physical properties of binary liquid mixtures of propiophenone and ethyl acetate at 303.15,308.15 and 313.15K. S.K.Bindhani, G.K.Roy &Y.K.Mohanty Russian Journal of Physical Chemistry A. Vol.94 (1827-1835) 2020 [3]. Excess Acoustical study of binary liquid mixture with experimental parameters at different temperatures. Timmeswara sarma nori, Ch srinivasu et al. Research and Riviews: Journal of physics vol. 8 No. 2 (30-41) 2019 [4]. Bhoj Bhadur Gurung , Mahendra Nath Roy, Study of densities , viscosities and ultrasonic speeds of binary mixtures containing 1,2 diethoxy ethane with alkane 1-ol at 298.15 K .Journal of solution chemistry volume 35, (1587-1606), 2006. [5]. Zareena Begaum et al. Thermodynamic, ultrasonic studies or binary liquid mixtures of anisaldehyde with alkoxy ethanols at different temperatures. Journal of molecular liquids, volume 178, February 2013 pages 99-112.

Abstract: Background: Xylitol is a sugar alcohol that has 5 carbon chains. Xylitol has a function as an antimicrobial, strengthens gums, prevents plaque on the teeth, is antidiabetic, additives in topical preparations, and sweeteners. The advantage of xylitol over sucrose is that it has a fairly low-calorie content with a sweetness equivalent to that of sucrose. Xylitol is classified as a safe sweetener for diabetics because it has a much lower glycemic index value.

Key Words: Aplication; Isolation; Properties; Xylitol.

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