{"title":"Green Synthesis of Flowers-Like Nanostructured Calcium Silicates: Kinetics and Adsorption Isotherms of Malachite Green Dye Removal from Polluted Water","authors":"O. Fouad, Samar H. Bendary, A. Hashem","doi":"10.2139/ssrn.3730366","DOIUrl":"https://doi.org/10.2139/ssrn.3730366","url":null,"abstract":"Microwaves assisted synthesis of flowers-like nanostructured calcium silicates from marble sawing powder and silica fume wastes has been successfully done in a very short reaction time, energy saving and cost effective approach. XRD analysis of the synthesized powder showed that wollastonite; CaSiO 3 is the predominant phase. Cotton-like structures which composed mainly of coalescenced tiny cubes in the range of less than 1000 nm in size have been obtained as observed from FESEM images. The maximum monolayer adsorption capacity, q max at 30 °C of Malachite green was found to be 17.12 mg/g. Different parameters affect the adsorption process as; pH, sorbent dose, dye concentration and temperature was experimented. The kinetics studies indicated that the adsorption kinetics of MG dye on calcium silicate followed the pseudo- first order reaction. The experimental results also showed that the Malachite green adsorption is fitted better to Freundlich isotherm model. The dye adsorption process was spontaneous, exothermic reaction as indicated from thermodynamic studies. Diffusion model reveal that intra-particle diffusion mechanism was not the sole rate-limiting step in this adsorption.","PeriodicalId":314762,"journal":{"name":"ChemRN: Materials Characterization (Topic)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128908107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Safaei‐Ghomi, Atefeh Bakhtiari, Raheleh Teymuri
{"title":"Preparation of Heterogeneous Pd-Containing Catalysts Anchored on a Hybrid Organic-Inorganic Surface of SBA-15 and its Application in Green Synthesis of Pyridopyrimidines","authors":"J. Safaei‐Ghomi, Atefeh Bakhtiari, Raheleh Teymuri","doi":"10.2139/SSRN.3726992","DOIUrl":"https://doi.org/10.2139/SSRN.3726992","url":null,"abstract":"A new functionalized SBA-15 mesoporous silica has been prepared as a catalyst and characterized by different analytical techniques to determine the quality of the catalyst, including X-ray diffraction spectroscopy (XRD), Temperature Programmed Desorption (TPD), N 2 adsorption analysis, Field emission scanning electron microscopy (FE-SEM), X-Ray photoelectron spectroscopy (XPS), Transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), Energy-dispersive X-ray spectroscopy (EDX), and Thermogravimetric, Differential thermal analysis (TGA-DTA). The efficiency of the catalyst has been evaluated by synthesizing a wide range of polyfunctionalized pyrido[2,3-d] pyrimidines. This method provides several advantages containing mild reaction conditions, excellent yields in short times, the reusability of the catalyst and low catalyst loading.","PeriodicalId":314762,"journal":{"name":"ChemRN: Materials Characterization (Topic)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116328517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Determination of the Applicability of ZnAl Layered Double Hydroxide, Intercalated by Food Dye Orange Yellow S, as a Cosmetic Pigment","authors":"V. Kovalenko, V. Kotok","doi":"10.15587/1729-4061.2020.214847","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.214847","url":null,"abstract":"Nail polish, in particular gel nail polish, is the most used cosmetic product. The components of the gel polish, which determine both toxicity and consumer color properties, are pigments. Zn-Al layered double hydroxides intercalated with anionic food dyes are promising pigments for use in gel polish. The parameters of the samples of Orange Yellow S-intercalated Zn-Al (Zn:Al=4:1 and Zn:Al=2:1) hydroxides synthesized at pH=8 and pH=11 were studied. The crystal structure of the samples was studied by X-ray phase analysis and thermogravimetry, and the pigment properties – by the method of measuring and calculating color characteristics in the CIELab and XYZ systems. The color characteristics of gel nail polish samples prepared using synthesized pigments were studied in a similar way.<br><br>X-ray phase analysis and thermogravimetry showed that Zn-Al-Orange Yellow S pigments synthesized at both Zn:Al ratios and pH were layered double hydroxides with the α-Zn(OH)2 structure. The phenomenon of the decomposition of Zn-Al LDH to ZnO during the synthesis was revealed. As a result, all Zn-Al-Orange Yellow S pigment samples contained both layered double hydroxide and zinc oxide. It was shown that all samples of the Zn-Al-Orange Yellow S pigment obtained at pH 8 and 11 and the ratios Zn:Al=4:1 and Zn:Al=2:1 had high pigment characteristics and are promising for use in gel polish. The samples of gel nail polish with synthesized pigments have a red-orange color (сolor tone 595–604 nm) with high monochromaticity (color purity 63–75 %) and color saturation (48.7–58.3).","PeriodicalId":314762,"journal":{"name":"ChemRN: Materials Characterization (Topic)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127435598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Analysis of the Crystalline Structure of Polymorphic Modifications of Compound Вa6Ta2O11","authors":"Viktor Zavodyannyy","doi":"10.15587/2706-5448.2020.214849","DOIUrl":"https://doi.org/10.15587/2706-5448.2020.214849","url":null,"abstract":"The object of research is the crystal structure of polymorphic modifications of the Ва6Ta2O11 compound. This compound has low dielectric losses in the microwave (microwave) range and can be used in microwave technology. The compound crystallizes in the structural type of cryolite with cubic lattice parameters a=8.69 А°. At the same time, Ва6Ta2O11 has inherent polymorphism. The paper proposes models of crystal structures for the a- and b-phases of the compound for the spectra under the numbers 00-049-0899, and 00-049-0903 in the database of powder diffraction patterns PDF-2 for 2004. The compound has a lattice that does not belong to the tetragonal system, as suggested earlier, but to the orthorhombic one. For the-phase, a structural model is proposed: orthorhombic system with lattice periods a=6.218 A°; b=8.509 A°; c=6.227 A°. The space group P212121 is possible (19). Odds factor R=8.54707 %. For the b-phase: the orthorhombic system. The space group of symmetry Fmmm (69) with lattice period is possible a=8.668 (7) A°; b=8.677 (8) A°; c=8.685 (7) A°. Odds factor R=7.03646 %. Let’s assume that the phase transitions are associated not only with a change in the lattice symmetry (the appearance of the second crystal symmetry elements), but also with structural disordering. The regular systems of points of the a-andb-phases of the compound are not completely filled, which introduces defects into the crystal lattice. Thus, the structure of the a-phase of the compound is completely occupied by the positions of the B2, B5, B6, B7, Ta2, Ta3, O3, O10 atoms (it has the correct system of points 4a). The structure of the b-phase has regular systems of points 4a, 4b, 8f, 32p, completely filled with atoms. This leads to distortion of the crystal structure of the test compound. The structure of the b-phase additionally has elements of symmetry of the mirror reflection plane, perpendicular to the x, y, z axes. They have elements of symmetry: the axis of symmetry of the 2nd order, parallel to the axes x, y, z. Also, helical symmetry axes of the 2nd order (inherent in both structures), parallel to the x, y, z axes, and grazing reflection planes perpendicular to the x, y, z axes, with n-slip along the diagonal. The conducted studies of the crystal structure of the compound allow to study in more detail its physical properties, in particular, as a promising dielectric in the microwave range.","PeriodicalId":314762,"journal":{"name":"ChemRN: Materials Characterization (Topic)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127807021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Nazarenko, R. Kovalenko, V. Asotskyi, G. Chernobay, A. Kalynovskyi, I. Tsebriuk, O. Shapovalov, I. Shasha, V. Demianyshyn, A. Demchenko
{"title":"Determining Mechanical Properties at the Shear of the Material of ‘T’ Type Pressure Fire Hose Based on Torsion Tests","authors":"S. Nazarenko, R. Kovalenko, V. Asotskyi, G. Chernobay, A. Kalynovskyi, I. Tsebriuk, O. Shapovalov, I. Shasha, V. Demianyshyn, A. Demchenko","doi":"10.15587/1729-4061.2020.212269","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.212269","url":null,"abstract":"This paper reports the results of experimental studies into determining mechanical properties (elastic and dissipative) at the shear of the material of a pressure fire hose of the \"T\" type with the internal diameter of 77 mm using torsion tests. During the studies, a series of field experiments have been conducted on the torsion of the pressure fire hose samples with internal hydraulic pressure (P) in a hose of 0.2 МPа (Р 1 ), 0.4 МPа (Р 2 ), and 0.6 МPа (Р 3 ) under conditions of static loading-unloading cycles. The tests consisted of 6 cycles – for each of the (P) loading-unloading cycles, which were carried out at a two-minute interval, the rigidity and elasticity modules at the shear of the material of a hose were determined by means of torsion tests. It was established that the numerical results of mechanical properties depend on the hose load \"history\", that is, the elasticity modules increased in the first two, three load cycles, and they stabilized only afterward at the level of 3.04 MPa for Р 1 , 4.35 МPа for Р 2 , 4.39 МPа for Р 3 . The above, together with a significant decrease in residual deformations, strengthens the elastic properties of the fire hose material. The results of the research have been approximated by the corresponding trend lines. The equation of dependence of the current torque on deformation was determined. The curves of the deformation of samples, which, under the conditions of cyclic loading-unloading, formed hysteresis loops, were established. The resulting hysteresis loops during the study in the first two modes undergo quantitative and qualitative changes, namely, the slope and its area decrease. The similarity of experimental studies at different internal pressures (P) was established. A change in the properties of the material of a fire hose at the consecutive loading-unloading deformation cycles is reverse, the gaps between the deformation cycles lead to a partial restoration of the mechanical characteristics, approximating them to the original values","PeriodicalId":314762,"journal":{"name":"ChemRN: Materials Characterization (Topic)","volume":"114 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113983588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Amita Bedar, Beena G Singh, Pradip K Tiwari, Ramesh C Bindal, S. Kar
{"title":"Kinetics Studies on Free Radical Scavenging Property of Ceria in Polysulfone-Ceria Radiation Resistant Mixed-matrix Membrane","authors":"Amita Bedar, Beena G Singh, Pradip K Tiwari, Ramesh C Bindal, S. Kar","doi":"10.2139/ssrn.3709689","DOIUrl":"https://doi.org/10.2139/ssrn.3709689","url":null,"abstract":"Cerium oxide (ceria) contains two stable states of cerium ions (Ce3+ and Ce4+). The presence of these two states, and the ability to swap from one state to another (Ce3+ ↔ Ce4+) by scavenging the highly reactive oxygen species (ROS) generated from radiolysis of water, ensures the enhanced stability of polysulfone (Psf) membranes in the γ-radiation environment. In this study, the ROS scavenging ability of ceria was studied. Ceria nanoparticles were found to scavenge hydroxyl radicals and hydrogen peroxide by mimicking peroxidase-like activity. This is responsible for offering protection to the Psf host matrix, and in turn the stability to the Psf-ceria mixed-matrix membranes (MMMs) in γ-radiation environment. Thus, presence of ceria nanoparticles provides an opportunity for the application of Psf-ceria MMMs in radioactive effluent treatment with increased life span, without compromise in the performance.","PeriodicalId":314762,"journal":{"name":"ChemRN: Materials Characterization (Topic)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129806212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pei-En Chen, Wenxiang Xu, N. Chawla, Yi Ren, Yang Jiao
{"title":"Novel Hierarchical Correlation Functions for Quantitative Representation of Complex Heterogeneous Materials and Microstructural Evolution","authors":"Pei-En Chen, Wenxiang Xu, N. Chawla, Yi Ren, Yang Jiao","doi":"10.2139/ssrn.3397269","DOIUrl":"https://doi.org/10.2139/ssrn.3397269","url":null,"abstract":"Effective and accurate characterization and quantification of complex microstructure of a heterogeneous material and its evolution under external stimuli are very challenging, yet crucial to achieving reliable material performance prediction, processing optimization and advanced material design. Here, we address this challenge by developing a set of novel hierarchical statistical microstructural descriptors, which we call the \"n-point polytope functions\" Pn, for quantitative characterization, representation and modeling of complex material microstructure and its evolution. These novel polytope functions successively include higher-order n-point statistics of the features of interest in the microstructure in a concise, expressive, explainable, and universal manner; and can be directly computed from multi-modal imaging data. We develop highly efficient computational tools to directly extract the Pn functions up to n = 8 from multi-modal imaging data. Using simple model microstructures, we show that these novel statistical descriptors effectively \"decompose\" the structural features of interest into a set of \"polytope basis\", allowing one to easily detect any underlying symmetry or emerging features during the structural evolution. We apply these novel Pn functions to quantify and model a variety of heterogeneous material systems, including particle-reinforced composites, metal-ceramic composites, concretes, porous materials; as well as the microstructural evolution in an aged lead-tin alloy. Our results indicate that the Pn functions can offer a practically complete and compact set of basis for quantitative microstructure representation (QMR), for both static 3D complex microstructure and 4D microstructural evolution of a wide spectrum of heterogeneous material systems.","PeriodicalId":314762,"journal":{"name":"ChemRN: Materials Characterization (Topic)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129870892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Advancement in Ultrasonic Vibration and Magnetic Field Assisted Micro-EDM Process: An Overview","authors":"P. Mukhopadhyay, B. Sarkar","doi":"10.34218/IJARET.10.2.2019.035","DOIUrl":"https://doi.org/10.34218/IJARET.10.2.2019.035","url":null,"abstract":"Micro-machining of components has been emerged as a peak demand in the world of micro-manufacturing. Micro-EDM is proved to be the most suitable for micro drilling purposes. It is very essential to fabricate micro holes as well as features with very high dimensional accuracy and precision. The major drawbacks in micro-EDM processes are the low metal removal, tool wear and surface roughness. Researchers have carried out several investigations to compensate the various machining problems in the micro EDM process. So, there evolves a need for development of more sophisticated machining features in micro-EDM process combining with additional techniques. This paper presents a brief review on the latest advancement in ultrasonic vibration and magnetic field assisted techniques to improve machining efficiency and surface qualities of machined features in micro-EDM process. Latest industrial applications of micro EDM have been presented.","PeriodicalId":314762,"journal":{"name":"ChemRN: Materials Characterization (Topic)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132422366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Ordered Vacancies in the Fluorite-Type Layers of the Lanthanide BiLuWO 6 Phase by Electron Crystallography","authors":"L. Patout, C. Alfonso, A. Charaï","doi":"10.2139/ssrn.3310392","DOIUrl":"https://doi.org/10.2139/ssrn.3310392","url":null,"abstract":"The paper brings new information about the superstructure present in the monoclinic <i>A2/m</i> BiLuWO<sub>6</sub> crystal phase. ED and HREM investigations in several crystal projections have highlighted the presence of a cationic disorder in the fluorite-like blocks with sites having specific occupancy values. The disorder doubling the length of the unit-cell parameter <i><b>b</b></i> shows a lower symmetry in agreement with the <i>P2</i> space group (SG).","PeriodicalId":314762,"journal":{"name":"ChemRN: Materials Characterization (Topic)","volume":"515 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123073878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A Short Note on the Interference Layer Microscopy","authors":"Amelia Carolina Sparavigna, Mauro Giorcelli","doi":"10.2139/ssrn.3070405","DOIUrl":"https://doi.org/10.2139/ssrn.3070405","url":null,"abstract":"The interference layer microscopy is a specific technique of microscopy that requires the deposition on the specimen of a thin layer of a transparent dielectric material to enhance the contrast of the observed images. In white light, the different components of the specimen appear as having different and distinctive colors. In this manner, the specimen can be rendered in beautiful colored micrographs. Here, we shortly discuss this technique. We also propose an analysis of a colored image obtained by this technique, analysis made by means of a processing based on RGB histograms.","PeriodicalId":314762,"journal":{"name":"ChemRN: Materials Characterization (Topic)","volume":"438 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122884491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}