Lead zirconate titanate PbZr(1-x)TixO3 (PZT) particles were synthesized at x of 0.48 using a solid-state reaction (SSR) method at various operating temperatures of 700 – 1000 °C. Prior to the solid-state reaction in a muffle furnace, the precursor powder was shaker milled for two hours. The structural analysis of the particles diffraction patterns reveals the formation of perovskite structure of PZT particles and the coexistence of tetragonal and rombhohedral phase at the samples synthesized at temperatures of 800 and 900 °C. The crystallite size of particles synthesized at 1000 °C and commercial were 36.00 and 47.98 nm, respectively. The synthesized particles were non-spherical and showed the formation of bimodal particle size distribution with sizes of 5 – 20 μm. In conclusion, PZT particles have been successfully synthesized via a one-step synthesis using SSR method with a pre-mixed shaker milling.
{"title":"One Step Synthesis of Lead Zirconate Titanate Ceramic Using a Solid State Reaction Method","authors":"Darmawan Hidayat, Mohammad Taufik, S. Setianto","doi":"10.2139/ssrn.3874492","DOIUrl":"https://doi.org/10.2139/ssrn.3874492","url":null,"abstract":"Lead zirconate titanate PbZr<sup>(1-x)</sup>Ti<sup>x</sup>O<sup>3</sup> (PZT) particles were synthesized at x of 0.48 using a solid-state reaction (SSR) method at various operating temperatures of 700 – 1000 °C. Prior to the solid-state reaction in a muffle furnace, the precursor powder was shaker milled for two hours. The structural analysis of the particles diffraction patterns reveals the formation of perovskite structure of PZT particles and the coexistence of tetragonal and rombhohedral phase at the samples synthesized at temperatures of 800 and 900 °C. The crystallite size of particles synthesized at 1000 °C and commercial were 36.00 and 47.98 nm, respectively. The synthesized particles were non-spherical and showed the formation of bimodal particle size distribution with sizes of 5 – 20 μm. In conclusion, PZT particles have been successfully synthesized via a one-step synthesis using SSR method with a pre-mixed shaker milling.","PeriodicalId":9858,"journal":{"name":"Chemical Engineering (Engineering) eJournal","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75488933","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}
Rui Zhang, Wei Liu, L. Kong, Qian Zhang, Shuxin Ye, Sijia Jiang, Jingren He, Muci Wu
This study aimed to investigate the nanoliposomes composed of soy lecithin and cholesterol for encapsulation of anthocyanins (ACNs) by thin film ultrasonic dispersion method. The processing conditions of ACNs nanoliposomes (ANLs) were optimized, and the ANLs were characterized by average particle size, zeta (ζ)-potential and polydispersity index (PDI). Their storage stability under various pH, temperature, light conditions, and in vitro antiproliferative effect were analyzed. The optimal preparation parameters were suggested to be soy lecithin to cholesterol ratio of 80 mg to 19 mg (w/w, 2 mg of ACNs) by using ultrasonication at 120 W for 3.12 min. The produced ANLs had the encapsulation efficiency of 40.1 % with average particle size of 117 nm, PDI of 0.254 and ζ-potential of 8.56 mV. These ANLs presenting ≈ 130 nm of stable sizes at tested pH conditions. The ACNs showed better in vitro antiproliferative effect for two cancer cell lines than ANLs, while ANLs were more stable against temperature and light. The ACNs in nanoliposomes displayed higher retention efficiency than that of in solution under various storage conditions. This study provides a promising approach for stabilizing ACNs-containing food ingredients, which displays large potentiality in the productions of nutraceutical and functional foods.
{"title":"Preparation, Characterization and Antiproliferation Evaluation of Nanoliposome Loaded with Anthocyanins","authors":"Rui Zhang, Wei Liu, L. Kong, Qian Zhang, Shuxin Ye, Sijia Jiang, Jingren He, Muci Wu","doi":"10.2139/ssrn.3931686","DOIUrl":"https://doi.org/10.2139/ssrn.3931686","url":null,"abstract":"This study aimed to investigate the nanoliposomes composed of soy lecithin and cholesterol for encapsulation of anthocyanins (ACNs) by thin film ultrasonic dispersion method. The processing conditions of ACNs nanoliposomes (ANLs) were optimized, and the ANLs were characterized by average particle size, zeta (ζ)-potential and polydispersity index (PDI). Their storage stability under various pH, temperature, light conditions, and in vitro antiproliferative effect were analyzed. The optimal preparation parameters were suggested to be soy lecithin to cholesterol ratio of 80 mg to 19 mg (w/w, 2 mg of ACNs) by using ultrasonication at 120 W for 3.12 min. The produced ANLs had the encapsulation efficiency of 40.1 % with average particle size of 117 nm, PDI of 0.254 and ζ-potential of 8.56 mV. These ANLs presenting ≈ 130 nm of stable sizes at tested pH conditions. The ACNs showed better in vitro antiproliferative effect for two cancer cell lines than ANLs, while ANLs were more stable against temperature and light. The ACNs in nanoliposomes displayed higher retention efficiency than that of in solution under various storage conditions. This study provides a promising approach for stabilizing ACNs-containing food ingredients, which displays large potentiality in the productions of nutraceutical and functional foods.","PeriodicalId":9858,"journal":{"name":"Chemical Engineering (Engineering) eJournal","volume":"124 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73724255","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}
Hai Yan Wang, Shouyuan Huang, Simin Li, Guangli Zhang, Yuan Su, Cheng Lu
The geometric structures of anionic LaH-n (n=2-20) clusters are predicted by CALYPSO cluster structural search method and first-principles calculations. The low-lying isomers for each size of LaH-n (n=2-20) clusters are further reoptimized at B3LYP level by setting all-electron 6-311G++(d, p) basis set for H atoms and SDD basis set for La atom, respectively. The photoelectron spectroscopy (PES) of the ground-state structures are simulated by time-dependent DFT (TD-DFT) method. It is found that the anionic LaH-8 cluster with D2d symmetry is the most stable structure and its hydrogen storage capacity arrives at 5.4 wt%. The stability of anionic LaH-8 cluster is mainly affected by the strong interaction between H 1s orbital and La 5d orbital. The present results provide insights into the further exploration and discovery of novel rare-earth based hydrogen storage nanomaterials.
{"title":"Anionic LaH - 8: A Nanocluster-Based Hydrogen Storage Material","authors":"Hai Yan Wang, Shouyuan Huang, Simin Li, Guangli Zhang, Yuan Su, Cheng Lu","doi":"10.2139/ssrn.3878347","DOIUrl":"https://doi.org/10.2139/ssrn.3878347","url":null,"abstract":"The geometric structures of anionic LaH<sup>-</sup><sub><i>n</i></sub> (<i>n</i>=2-20) clusters are predicted by CALYPSO cluster structural search method and first-principles calculations. The low-lying isomers for each size of LaH<sup>-</sup><sub><i>n</i></sub> (<i>n</i>=2-20) clusters are further reoptimized at B3LYP level by setting all-electron 6-311G++(d, p) basis set for H atoms and SDD basis set for La atom, respectively. The photoelectron spectroscopy (PES) of the ground-state structures are simulated by time-dependent DFT (TD-DFT) method. It is found that the anionic LaH<sup>-</sup><sub>8</sub> cluster with D<sub>2<i>d</i></sub> symmetry is the most stable structure and its hydrogen storage capacity arrives at 5.4 wt%. The stability of anionic LaH<sup>-</sup><sub>8</sub> cluster is mainly affected by the strong interaction between H 1<i>s</i> orbital and La 5<i>d</i> orbital. The present results provide insights into the further exploration and discovery of novel rare-earth based hydrogen storage nanomaterials.","PeriodicalId":9858,"journal":{"name":"Chemical Engineering (Engineering) eJournal","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80952319","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}
Naike Shi, A. Sanson, Alessandro Venier, Longlong Fan, Yang Ren, Danilo Oliveira de Souza, L. Olivi, Yuzhu Song, X. Xing, Jun Chen
Chemical substitution is an effective method to control the thermal expansion properties in solid solutions. In this work, a series of solid solutions Cu2-xZnxP2O7(0 ≤ x ≤ 2) were synthesized by solid state methods. The thermal expansion in Cu2-xZnxP2O7 is tuned from strong negative thermal expansion (αv ~ -33.5×10-6 K-1, 100 - 375K) to near zero thermal expansion (αv ~ -2.78×10-6 K-1, 100 - 225K), and then to positive thermal expansion gradually with increasing content of Zn2+ substitution. The direct experiment results reveal that the Zn2+ substitution diminishes the rigidity of Cu/Zn-O and P-O bonds and the transverse vibrations of O atoms arousing negative thermal expansion. The present work realizes the control of thermal expansion from negative to near zero, and then to positive in the Cu2P2O7 system.
化学取代是控制固溶体热膨胀性能的有效方法。本文采用固相法合成了一系列Cu2-xZnxP2O7(0≤x≤2)固溶体。随着Zn2+取代物含量的增加，Cu2-xZnxP2O7中的热膨胀由强烈的负热膨胀(αv ~ -33.5×10-6 k - 1,100 - 375K)转变为接近零的热膨胀(αv ~ -2.78×10-6 k - 1,100 - 225K)，然后逐渐转变为正热膨胀。直接实验结果表明，Zn2+取代降低了Cu/Zn-O和P-O键的刚性，并引起O原子的横向振动引起负热膨胀。本工作实现了在Cu2P2O7体系中由负到近零再到正的热膨胀控制。
{"title":"Tuning Thermal Expansion From Strong Negative to Zero to Positive in Cu 2-xZn xP 2O 7 Solid Solutions","authors":"Naike Shi, A. Sanson, Alessandro Venier, Longlong Fan, Yang Ren, Danilo Oliveira de Souza, L. Olivi, Yuzhu Song, X. Xing, Jun Chen","doi":"10.2139/ssrn.3854490","DOIUrl":"https://doi.org/10.2139/ssrn.3854490","url":null,"abstract":"Chemical substitution is an effective method to control the thermal expansion properties in solid solutions. In this work, a series of solid solutions Cu2-xZnxP2O7(0 ≤ x ≤ 2) were synthesized by solid state methods. The thermal expansion in Cu2-xZnxP2O7 is tuned from strong negative thermal expansion (αv ~ -33.5×10-6 K-1, 100 - 375K) to near zero thermal expansion (αv ~ -2.78×10-6 K-1, 100 - 225K), and then to positive thermal expansion gradually with increasing content of Zn2+ substitution. The direct experiment results reveal that the Zn2+ substitution diminishes the rigidity of Cu/Zn-O and P-O bonds and the transverse vibrations of O atoms arousing negative thermal expansion. The present work realizes the control of thermal expansion from negative to near zero, and then to positive in the Cu2P2O7 system.","PeriodicalId":9858,"journal":{"name":"Chemical Engineering (Engineering) eJournal","volume":"93 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80258437","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}
Wei Liu, Xiaoming Zhang, W. Meng, Y. Liu, X. Dai, Guodong Liu
For electrochemical hydrogen evolution reaction (HER), developing high-performance catalysts without containing precious metals has been a major research focus in the current. Herein, we show the feasibility of HER catalytic enhancement in Ni-based materials based on topological engineering from hybrid Weyl states. Via a high-throughput computational screening from ∼140 000 materials, we identify a chiral compound NiSi is a hybrid Weyl semimetal (WSM) with showing bulk type-I and type-II Weyl nodes and long surface Fermi arcs near the Fermi level. Sufficient evidences verify that topological charge carriers participate in the HER process, and make the certain surface of NiSi highly active with the Gibbs free energy nearly zero (0.07 eV), which is even lower than Pt and locates on the top of the volcano plots. This work opens up a new routine to develop no-precious-metal-containing HER catalysts via topological engineering, rather than traditional defect engineering, doping engineering, or strain engineering.
{"title":"Enhancement of Electrocatalytic Hydrogen Evolution by Topological Engineering in Hybrid Weyl Catalyst NiSi","authors":"Wei Liu, Xiaoming Zhang, W. Meng, Y. Liu, X. Dai, Guodong Liu","doi":"10.2139/ssrn.3919944","DOIUrl":"https://doi.org/10.2139/ssrn.3919944","url":null,"abstract":"For electrochemical hydrogen evolution reaction (HER), developing high-performance catalysts without containing precious metals has been a major research focus in the current. Herein, we show the feasibility of HER catalytic enhancement in Ni-based materials based on topological engineering from hybrid Weyl states. Via a high-throughput computational screening from ∼140 000 materials, we identify a chiral compound NiSi is a hybrid Weyl semimetal (WSM) with showing bulk type-I and type-II Weyl nodes and long surface Fermi arcs near the Fermi level. Sufficient evidences verify that topological charge carriers participate in the HER process, and make the certain surface of NiSi highly active with the Gibbs free energy nearly zero (0.07 eV), which is even lower than Pt and locates on the top of the volcano plots. This work opens up a new routine to develop no-precious-metal-containing HER catalysts via topological engineering, rather than traditional defect engineering, doping engineering, or strain engineering.","PeriodicalId":9858,"journal":{"name":"Chemical Engineering (Engineering) eJournal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86486364","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}
Di Han, Jipeng Fei, Jyotirmoy Mandal, Zhixin Liu, M. Wan, Hong Li, A. Raman, B. Ng
Radiative cooling is a passive technology that lowers surface temperatures, which has shown great potential in temperate regions. However, cooling performance characterised by high solar irradiance and humidity under tropical climate still lacks exploration. Herein, we propose a highly reflective polymeric coating with BaSO4 particles dispersed in P(VdF-HFP) matrix for radiative cooling. Through the strong Mie scattering of sunlight and intrinsic bond vibration, the average substrate-independent solar reflectance and infrared emittance within the 8 to 13 μm atmospheric window could reach 97% and 94.2%, respectively. Under direct exposure to the sky, surfaces could maintain close to ambient temperatures even when the solar intensity was as high as 1000 W/m 2 , while separately achieving 5.7 °C below ambient during night-time with an effective cooling power of 54.4 W/m2. With a scalable fabrication-process, our cost-effective single-layer coating can be easily applied to diverse substrates, which is suitable for real-world applications in the tropics.
{"title":"Highly Reflective Polymeric Coating for Passive Radiative Cooling Under Tropical Climate","authors":"Di Han, Jipeng Fei, Jyotirmoy Mandal, Zhixin Liu, M. Wan, Hong Li, A. Raman, B. Ng","doi":"10.2139/ssrn.3850366","DOIUrl":"https://doi.org/10.2139/ssrn.3850366","url":null,"abstract":"Radiative cooling is a passive technology that lowers surface temperatures, which has shown great potential in temperate regions. However, cooling performance characterised by high solar irradiance and humidity under tropical climate still lacks exploration. Herein, we propose a highly reflective polymeric coating with BaSO<sub>4</sub> particles dispersed in P(VdF-HFP) matrix for radiative cooling. Through the strong Mie scattering of sunlight and intrinsic bond vibration, the average substrate-independent solar reflectance and infrared emittance within the 8 to 13 μm atmospheric window could reach 97% and 94.2%, respectively. Under direct exposure to the sky, surfaces could maintain close to ambient temperatures even when the solar intensity was as high as 1000 W/m 2 , while separately achieving 5.7 °C below ambient during night-time with an effective cooling power of 54.4 W/m<sup>2</sup>. With a scalable fabrication-process, our cost-effective single-layer coating can be easily applied to diverse substrates, which is suitable for real-world applications in the tropics.","PeriodicalId":9858,"journal":{"name":"Chemical Engineering (Engineering) eJournal","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78297685","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}
The resistance of Al0.5Cr0.9FeNi2.5V0.2 high entropy alloy (HEA) to hydrogen embrittlement was investigated by slow strain rate test (SSRT) and fracture surface was examined through scanning electron microscope. Compared with other ultra-high strength steels, Al0.5Cr0.9FeNi2.5V0.2 showed insignificant strength loss after hydrogen charging. The fracture surface of hydrogen charged specimens mainly consisted of dimples and no intergranular morphology was observed. The coupling effect of the dispersed nano-structured precipitates and high-density dislocations in Al0.5Cr0.9FeNi2.5V0.2 improves the resistance to hydrogen-induced strength loss.
{"title":"The Mechanism of the High Resistance to Hydrogen-Induced Strength Loss in Ultra-High Strength High Entropy Alloy","authors":"Zhenhuan Gao, Yunfei Xue, Jinxu Li, Lining Xu, Lijie Qiao","doi":"10.2139/ssrn.3910593","DOIUrl":"https://doi.org/10.2139/ssrn.3910593","url":null,"abstract":"The resistance of Al0.5Cr0.9FeNi2.5V0.2 high entropy alloy (HEA) to hydrogen embrittlement was investigated by slow strain rate test (SSRT) and fracture surface was examined through scanning electron microscope. Compared with other ultra-high strength steels, Al0.5Cr0.9FeNi2.5V0.2 showed insignificant strength loss after hydrogen charging. The fracture surface of hydrogen charged specimens mainly consisted of dimples and no intergranular morphology was observed. The coupling effect of the dispersed nano-structured precipitates and high-density dislocations in Al0.5Cr0.9FeNi2.5V0.2 improves the resistance to hydrogen-induced strength loss.","PeriodicalId":9858,"journal":{"name":"Chemical Engineering (Engineering) eJournal","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83558088","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}
Xiangfeng Li, F. Zhao, Fuying Chen, Xuening Chen, Yan Wang, Y. Xiao, Xing‐dong Zhang
Further enhance the bioactivity and osteoinductivity of biphasic calcium phosphate (BCP) bioceramics to meet the requirements of regenerative medicine is still a hot topic. Due to the uncontrolled pore structure and large grain size, the osteoinductivity of the conventional BCP bioceramics is restricted to a large extent. Herein, this study introduced a novel pore foaming method to fabricate BCP bioceramics with appropriately ordered macropores and abundant micropores by combing the advantages of the microsphere-sintering method with the H2O2 gas foaming method. Moreover, different sintering methods were adopted to adjust the micro-nano topography of BCP bioceramics. Due to the optimal design of pore size distribution and nano topography, the obtained BCP bioceramics could well trigger and regulate in vitro biological responses, such as degradation, bone-like apatite formation, protein adsorption, cell behaviors, angiogenic and osteogenic differentiation. In vivo canine intramuscular implantation further confirmed that the nanotopography and appropriately ordered pore structure might be responsible for the excellent neovascularization and osteoinductivity of the obtained BCP bioceramics. Collectedly, the osteoinductivity of BCP bioceramics was further enhanced by optimally designing pore structure and micro-nano topography, which hold huge potential to be a potential alternative to the gold standard of autogenous bone in bone repairing applications.
{"title":"Excellent Osteoinductivity of Biphasic Calcium Phosphate Bioceramics with the Optimal Design of Pore Size Distribution and Micro-Nano Topography","authors":"Xiangfeng Li, F. Zhao, Fuying Chen, Xuening Chen, Yan Wang, Y. Xiao, Xing‐dong Zhang","doi":"10.2139/ssrn.3849027","DOIUrl":"https://doi.org/10.2139/ssrn.3849027","url":null,"abstract":"Further enhance the bioactivity and osteoinductivity of biphasic calcium phosphate (BCP) bioceramics to meet the requirements of regenerative medicine is still a hot topic. Due to the uncontrolled pore structure and large grain size, the osteoinductivity of the conventional BCP bioceramics is restricted to a large extent. Herein, this study introduced a novel pore foaming method to fabricate BCP bioceramics with appropriately ordered macropores and abundant micropores by combing the advantages of the microsphere-sintering method with the H<sub>2</sub>O<sub>2</sub> gas foaming method. Moreover, different sintering methods were adopted to adjust the micro-nano topography of BCP bioceramics. Due to the optimal design of pore size distribution and nano topography, the obtained BCP bioceramics could well trigger and regulate in vitro biological responses, such as degradation, bone-like apatite formation, protein adsorption, cell behaviors, angiogenic and osteogenic differentiation. <i>In vivo</i> canine intramuscular implantation further confirmed that the nanotopography and appropriately ordered pore structure might be responsible for the excellent neovascularization and osteoinductivity of the obtained BCP bioceramics. Collectedly, the osteoinductivity of BCP bioceramics was further enhanced by optimally designing pore structure and micro-nano topography, which hold huge potential to be a potential alternative to the gold standard of autogenous bone in bone repairing applications.","PeriodicalId":9858,"journal":{"name":"Chemical Engineering (Engineering) eJournal","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84152089","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. Ahire, A. V. Patil, A. Bachhav, P. B. Koli, T. B. Pawar
The present deals with fabrication of undoped SnO2, transition metal Co2+ doped SnO2 and non-metal nitrogen doped SnO2 nanostructures. These three materials were prepared by cost effective co-precipitation method. While the thick film sensor was design by screen printing photolithography technique. The fabricated materials were characterized by several techniques. The structural properties of the screen-printed thick films measured by X-ray diffractometer (XRD), which confirms the formation of tetragonal SnO2 nanoparticles with average particle size between 15 -17 nm. The morphological properties of fabricated thick of SnO2 were studied by scanning electron microscopy (SEM), and HR-TEM to get surface and lattice characteristics of prepared material. The EDS technique was utilized to get the elemental composition of the prepared thick film sensors. While the UV-DRS technique was used to get the band gap energy of undoped SnO2 and modified SnO2 sensors. Since, the sensors effectively work over the surface, hence the prepared sensors were investigated by BET) study, from BET results the cobalt modified SnO2 found to be higher surface area. These all-prepared sensors were applied for gas sensing results of NO2, LPG, CO and volatile organic compounds (VOC’S). The modified sensors found to be very effective at NO2 and VOC gas vapours with 80.23 % and 69.13% gas response for cobalt modified SnO2 was observed. The tested gases NO2 and VOC found to be very selective modified sensors. Reusability and recycling results demonstrate that Co2+ doped SnO2 is very efficient, long time stable and reproducible sensor at NO2 and VOC gases.
{"title":"Designing of Screen-Printed Stannous Oxide Thick Film Sensors Modified by Cobalt and Nitrogen for Sensing Some Toxic Gases and Volatile Organic Compounds","authors":"S. Ahire, A. V. Patil, A. Bachhav, P. B. Koli, T. B. Pawar","doi":"10.2139/ssrn.3894844","DOIUrl":"https://doi.org/10.2139/ssrn.3894844","url":null,"abstract":"The present deals with fabrication of undoped SnO2, transition metal Co2+ doped SnO2 and non-metal nitrogen doped SnO2 nanostructures. These three materials were prepared by cost effective co-precipitation method. While the thick film sensor was design by screen printing photolithography technique. The fabricated materials were characterized by several techniques. The structural properties of the screen-printed thick films measured by X-ray diffractometer (XRD), which confirms the formation of tetragonal SnO2 nanoparticles with average particle size between 15 -17 nm. The morphological properties of fabricated thick of SnO2 were studied by scanning electron microscopy (SEM), and HR-TEM to get surface and lattice characteristics of prepared material. The EDS technique was utilized to get the elemental composition of the prepared thick film sensors. While the UV-DRS technique was used to get the band gap energy of undoped SnO2 and modified SnO2 sensors. Since, the sensors effectively work over the surface, hence the prepared sensors were investigated by BET) study, from BET results the cobalt modified SnO2 found to be higher surface area. These all-prepared sensors were applied for gas sensing results of NO2, LPG, CO and volatile organic compounds (VOC’S). The modified sensors found to be very effective at NO2 and VOC gas vapours with 80.23 % and 69.13% gas response for cobalt modified SnO2 was observed. The tested gases NO2 and VOC found to be very selective modified sensors. Reusability and recycling results demonstrate that Co2+ doped SnO2 is very efficient, long time stable and reproducible sensor at NO2 and VOC gases.","PeriodicalId":9858,"journal":{"name":"Chemical Engineering (Engineering) eJournal","volume":"104 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75409297","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}
M. Allaoui, M. Berradi, Achraf Khaddari, H. Erramli, Said Ibn Ahmed
During this study, we realized the preparation of an adsorbent based on shellfish taken from different areas of the beach of Mehdia (Morocco), and then we carried out their characterization by quantitative (XRD), qualitative (FTIR), optical (SEM-EDS) and granulometric analyses. The results obtained during this study show the shellfish studied is composed of the main minerals such as aragonite (68%) and calcite (32%) while an absence of vaterite. In addition, it shows that the crystalline structure of these shells is mainly composed of two polymorphs of calcium carbonate, namely calcite (CaCO3 (90.7%)) and aragonite (CaCO3 (43.9%)) of better stability. Moreover, they have shown that these calcium carbonates have an extensive porous structure with a specific surface consisting of a heterogeneous layer characterized by rounded particles and other mineral traces. This allows these carriers be used to as adsorbents applied in the removal of heavy metals from wastewater before discharge into the receiving environment.
{"title":"Preparation and Mineralogical, Spectroscopic and Granulometric Characterization of a Natural Adsorbent Based on a Mixture of Shells from Mehdia Beaches (Morocco)","authors":"M. Allaoui, M. Berradi, Achraf Khaddari, H. Erramli, Said Ibn Ahmed","doi":"10.2139/ssrn.3901853","DOIUrl":"https://doi.org/10.2139/ssrn.3901853","url":null,"abstract":"During this study, we realized the preparation of an adsorbent based on shellfish taken from different areas of the beach of Mehdia (Morocco), and then we carried out their characterization by quantitative (XRD), qualitative (FTIR), optical (SEM-EDS) and granulometric analyses. The results obtained during this study show the shellfish studied is composed of the main minerals such as aragonite (68%) and calcite (32%) while an absence of vaterite. In addition, it shows that the crystalline structure of these shells is mainly composed of two polymorphs of calcium carbonate, namely calcite (CaCO3 (90.7%)) and aragonite (CaCO3 (43.9%)) of better stability. Moreover, they have shown that these calcium carbonates have an extensive porous structure with a specific surface consisting of a heterogeneous layer characterized by rounded particles and other mineral traces. This allows these carriers be used to as adsorbents applied in the removal of heavy metals from wastewater before discharge into the receiving environment.","PeriodicalId":9858,"journal":{"name":"Chemical Engineering (Engineering) eJournal","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88378309","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}
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