Journal of New Technology and Materials


Description

“Journal of New Technology and Materials”(JNTM) is an international peer-reviewed journal that publishes high quality original works on the Material science s (physics, chemistry and life sciences) and engineering. It covers the aspect of materials science and engineering in all forms, particularly materials associated with new technologies (nanoscience and nanotechnology). JNTM provides a platform for researchers, students and industrialist to submit on-going research and developments in material and technology areas. Authors are solicited to contribute to the JNTM by submitting articles that illustrate research results and projects that describe significant advances in all areas covered by our scientific journal (JNTM). More informations are available on : https://sites.google.com/site/jntmjournal, ....... Citation on Google Scholar: https://scholar.google.fr/citations?user=bNBJ-50AAAAJ&hl=fr


11

Volumes

22

Numéros

263

Articles


HIGH-TEMPERATURE HYDROLYSIS AS A METHOD FOR COMPLEX PROCESSING OF SPRAT (Sprattus Sprattus Balticus) BY-PRODUCTS

Mezenova Olga,  Baidalinova Larisa,  Mezenova Natalya,  Agafonova Svetlana,  Volkov Vladimir,  Verkhoturov Vasilij,  Grimm Thomas,  Hoehling Axel, 
2022-04-05

Résumé: This research is very topical due to the problem of processing fish by-products from the production of canned food «Sprats in oil». The aim of the study was to justify the com-plex processing of smoked sprat heads using the method of high temperature thermal hydrolysis. The new technology was tested with fatty (24%) and medium fatty (13%) raw materials using high temperatures in the range of 130-160 °С. As a result, the hydrolyzed organic mass was separated into fat, protein, mineral-protein and protein-fat emulsion fractions. Freeze-drying of the protein fraction and convective drying of the protein-mineral fraction resulted in food additives containing, respectively, low molecular weight water-soluble peptides and high molecular weight insoluble proteins and minerals. A rational method of hydrolysis is substantiated, including preliminary separation of fat in fatty raw materials and its enzymatic-thermal treatment. The optimal values of temperature and duration of hydrolysis in reactor are substantiated. Under these conditions, proteins are extracted most deeply from sprat raw materials, and the content of low molecular weight peptides in the protein freeze-dried hydrolysate powder is more than 80%. A comprehensive technology has been developed for the production of protein, fat and protein-mineral food additives from sprat processing by-products. The balances of organic substances for the main operations were calculated. The additives have pleasant organoleptic characteristics, are sanitary safe, positively tested in some food samples. The developed method for processing of smoked fish by-products is economically viable It allows to produce valuable food products from secondary raw materials and solves the environmental problems of recycling of smoked fish by-products.

Mots clés: Smoked Sprat Heads ; Thermal Hydrolysis ; Enzymatic-Thermal Hydrolysis ; Protein Supplement ; Protein-Mineral Fraction ; Emulsion Fraction


Thermodynamic description of the phase diagram and thermodynamic properties of the Bi–K binary system

دزيري فطيمة,  بلباشة الجمعي,  جاب الله يسين,  بلقاسم بوزيدة عيسى, 
2022-05-11

Résumé: The Bi-K binary system is reassessed by coupling CALPHAD approach and first-principles calculations. The calculated lattice parameters and enthalpies of formation have been obtained from density functional theory as implemented in the VASP (Vienna Ab-initio Simulation Package) code. The whole system is optimized by CALPHAD method, where the liquid solution is described by the associate model and the binary compounds are described as stoichiometric phases. A good agreement has been obtained between the experimental data, first-principles calculation and thermodynamic optimization.

Mots clés: Bi-K alloys ; Phase diagram ; First principle calculations ; Calphad


Influence of sol concentration on FTO nanopowders synthesized by co-precipitation method for solar cell applications

Malek Sara,  Baghshahi Saeid,  Sarraf-mamoory Rasoul,  Nemati Ali, 
2022-04-29

Résumé: In the current research, Fluorine-doped tin oxide (FTO) nano-powders have been synthesized by the co-precipitation method. Stannous chloride pentahydrate, ammonium fluoride was used to synthesize FTO nano-powder, followed by calcination at 600 °C. The results showed that when the solution concentration value increased from 0.2 M to 1 M, the average crystallite size and particle size increased from 8 nm to 30 nm and 25 nm to 70 nm. By increasing sol concentration from 0.2 M to 1M, transmittance decreased. The bonding energy for fluorine is 684.7 eV Which corresponds to the peak of fluorine substitution in tin dioxide. The sample 0.2 M sol concentration would be a good candidate to achieve a high density and conductivity sputtering target.

Mots clés: fluorine-doped tin dioxide, co-precipitation, Nano powder, sol concentration


Study of the performance of a refrigeration cycle without and with ejector using ternary azeotropic refrigerants

Maalem Youcef,  Zerfa Abdnour,  Mehemmai Mohammed,  Madani Hakim,  Fedali Saida, 
2022-04-05

Résumé: This work presents an energy analysis of an operating cycle of a conventional refrigerating machine without and with ejector using ternary azeotropic mixtures as refrigerants with the refrigerant R134a, the mixtures considered in this study are: R600a +R1234ze+R13I1, R134a+R1234yf+R600a and R134a+RE170+R600a. A numerical simulation was carried out to evaluate and compare the energy performance of these mixtures with the R134a refrigerant, in particular the determination of the coefficient of performance (COP). The comparison was made for evaporation temperatures (Te) between (-10 and 10) ° C and condensation temperatures (Tc) between (30 and 55) ° C. The results obtained show in particular that the refrigeration system with ejector allows an increase in COP greater than 5.07% compared to that of the conventional refrigeration system and that the performance obtained with the ternary azeotrope mixture R134a+RE170+R600a offers the maximum values of COP compared to the other mixtures (R600a+R1234ze+R13I1 and R134a+R1234yf+R600a) as well as the refrigerant R134a in the two cycles studied.

Mots clés: Ternary refrigerants ; Conventional cycle ; Ejector ; Entrainment ratio ; COP


Studies of Gmelina aborea Fruits Latex as Envirounmental Friendly Corrosion Inhibitor on Aluminium Corrosion in HCl

Abdul Sani Usman,  Ibrahim Muhammad Bashir, 
2022-04-29

Résumé: The ability of crude Gmelina aborea fruits latex without carrying out any solvent extraction of the fruits to inhibit the corrosion of aluminium in 1.0 M HCl solution was determined using weight loss method. The inhibition efficiency was found to increase with the increase in concentration of the inhibitor and decrease with the increase in temperature. The inhibition efficiency of 94.13% was the highest recorded in the presence of 5.0 mL/L inhibitor concentration. The negative signs on the Gibb’s free energy (ΔG) suggested a spontaneous process for the adsorption of Gmelina aborea on aluminium surface. The thermodynamics and kinetics data indicated exothermic and physisorption process which was supported by FTIR spectra. The adsorption mechanism was more fitted to Langmuir model of adsorption.

Mots clés: Adsorption ; aluminium ; corrosion ; inhibitor ; kinetics ; thermodynamics


Characterization of PMMA based nanocomposite plasticized polymer electrolytes: Effect of plasticizer and fumed silica

Kumar R.,  Lath S.k.,  Kumar R.,  Sharma V.,  Sharma H.,  Sharma S.,  Kaur S.,  Arora N.,  Sharma V.,  Kaushal M. L., 
2022-04-29

Résumé: Polymethylmethacrylate (PMMA) based polymer electrolytes containing ammonium trifluoromethane sulphonate (NH4CF3SO3), have been synthesized by solution casting method. Ionic conductivity of polymer electrolytes has been measured and maximum conductivity of 2.05 x10-4 S/cm at room temperature has been observed at 10wt% NH4CF3SO3. The conductivity of polymer electrolytes has been found to increase with the addition of plasticizers. The effect of dielectric constant of plasticizer has also been studied and found that the increase in ionic conductivity containing high dielectric constant plasticizer DMA (37.8) is more than that of electrolyte containing low dielectric constant plasticizer DEC (3.2). The conductivity of plasticized polymer electrolytes further increases by a factor with the addition of fumed silica (SiO2) alongwith an increase in mechanical strength. The increase in ionic conductivity of polymer electrolytes with the addition of nano-filler has been explained by double threshold percolation model. Thermal stability of nano-composite plasticized polymer electrolytes has been checked by simultaneous measurement of DSC/TGA curves. The small change in ionic conductivity of nano-composite plasticized polymer electrolytes with temperature and time suggests that these electrolytes are thermally stable in 30-130oC temperature range, which is useful for their use in electrochemical device applications like fuel cells, supercapacitors, proton batteries etc.

Mots clés: ionic conductivity ; plasticizer ; fumed silica ; dielectric constant ; nano-filler


Effects of different factors on the heat conduction properties of a nanostructured material comprising carbon nanotubes

Chen Junjie, 
2022-04-29

Résumé: The increasing popularity of carbon nanotubes has created a demand for greater scientific understanding of the characteristics of thermal transport in nanostructured materials. However, the effects of impurities, misalignments, and structure factors on the thermal conductivity of carbon nanotube films and fibers are still poorly understood. Carbon nanotube films and fibers were produced, and the parallel thermal conductance technique was employed to determine the thermal conductivity. The effects of carbon nanotube structure, purity, and alignment on the thermal conductivity of carbon films and fibers were investigated to understand the characteristics of thermal transport in the nanostructured material. The importance of bulk density and cross-sectional area was determined experimentally. The results indicated that the prepared carbon nanotube films and fibers are very efficient at conducting heat. The structure, purity, and alignment of carbon nanotubes play a fundamentally important role in determining the heat conduction properties of carbon films and fibers. Single-walled carbon nanotube films and fibers generally have high thermal conductivity. The presence of non-carbonaceous impurities degrades the thermal performance due to the low degree of bundle contact. The thermal conductivity may present power law dependence with temperature. The specific thermal conductivity decreases with increasing bulk density. At room temperature, a maximum specific thermal conductivity is obtained but Umklapp scattering occurs. The specific thermal conductivity of carbon nanotube fibers is significantly higher than that of carbon nanotube films due to the increased degree of bundle alignment.

Mots clés: Carbon nanotubes ; Thermal properties ; Carbon fibers ; Thermal conductivity ; Nanostructured materials ; Umklapp scattering


Study on structural analysis of composite based on isoprene rubber with the participation of butadiene-nitrile rubber

رحيموفا سابينا,  أميروف فريز,  موفلايف ابراهيم,  مامادوف شيراز,  خانكيشييفا رنا, 
2022-04-05

Résumé: The molecular weight distribution (MWD) of cross-linked elastomers have been studied by sol-gel permeation chromatography. The value of the number average molecular weight Mn of the samples decreases from 500∙103 to 150-200∙103, and the value of Mw is reached from 2000∙10 3 to 1000∙10 3. It has been shown that the mixture is characterized by a relation between the plastic and the molecular weight of the samples, and the plasticity of the required group can be obtained by adjusting the molecular weight distribution of growing chains. The kinetics of metal oxide vulcanization of isoprene mixtures with NBR have been investigated by exposing to high temperature. The calculation showed that cis - unsaturation is 4% in the change mode. It has been found that the yield of the number of cross-links during metal oxide vulcanization increases 1.5 times. In order to accelerate the degree of cross-linking and optimal properties of vulcanizates, hexachloroparaxylene was introduced quasi-systems as an accelerator. It is assumed that these changes are associated with the occurrence of mechanochemical processes leading to the formation and increase of the concentration of cross-links nc.

Mots clés: kinetics vulcanization ; structures; ; isoprene ; rheology ; crosslinking ; viscosity ; gel-fraction ; elasticity