Pub Date : 2021-01-01DOI: 10.17277/jamt.2021.04.pp.256-266
A. I. Digurova, N. Lvova
The paper presents the results of quantum-chemical modeling of structural and electronic states of “boron + vacancy” complex defects on the hydrogenated and clean diamond surface, with a variation in the position of BV complexes in the upper six surface layers. Neutral, positive and negatively charged states of the complexes are considered. Two different positions of impurity and intrinsic defects in the composition of the BV complex have been considered for the third and fourth layers: under the dimer row and between the rows. The influence of the surface passivation on the position of BV complexes on the energy scale is analyzed. It has been found that hydrogenation of the surface leads to a change in the configuration of the most stable BV complex. The formation of a local graphite-like structure with π-conjugation is the main stabilizing factor for the defect structures, regardless of the considered charge state. It was shown that the distribution of the spin density of the studied negative BV complexes located directly in the near-surface layers of the clean and hydrogenated surface is similar to the spin properties of complexes in the bulk of diamond.
{"title":"“Boron + vacancy” complexes \u0000on the hydrogenated diamond surface С(100)-(2×1)","authors":"A. I. Digurova, N. Lvova","doi":"10.17277/jamt.2021.04.pp.256-266","DOIUrl":"https://doi.org/10.17277/jamt.2021.04.pp.256-266","url":null,"abstract":"The paper presents the results of quantum-chemical modeling of structural and electronic states of “boron + vacancy” complex defects on the hydrogenated and clean diamond surface, with a variation in the position of BV complexes in the upper six surface layers. Neutral, positive and negatively charged states of the complexes are considered. Two different positions of impurity and intrinsic defects in the composition of the BV complex have been considered for the third and fourth layers: under the dimer row and between the rows. The influence of the surface passivation on the position of BV complexes on the energy scale is analyzed. It has been found that hydrogenation of the surface leads to a change in the configuration of the most stable BV complex. The formation of a local graphite-like structure with π-conjugation is the main stabilizing factor for the defect structures, regardless of the considered charge state. It was shown that the distribution of the spin density of the studied negative BV complexes located directly in the near-surface layers of the clean and hydrogenated surface is similar to the spin properties of complexes in the bulk of diamond.","PeriodicalId":13355,"journal":{"name":"Image Journal of Advanced Materials and Technologies","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74228326","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}
Pub Date : 2021-01-01DOI: 10.17277/jamt.2021.03.pp.167-178
A. Talantsev, E. Kunitsyna, R. Morgunov
In this paper, we present the study of domain structure accompanying interstate transitions in Pt/Co/Ir/Co/Pr synthetic ferrimagnet (SF) of 1.1 nm thick and 0.6 – 1.0 nm thin ferromagnetic Co layers. Variation in the thickness of the thin layer causes noticeable changes in the domain structure and mechanism of magnetization reversal revealed by MOKE (Magneto-Optical Kerr Effect) technique. Magnetization reversal includes coherent rotation of magnetization of the ferromagnetic layers, generation of magnetic nuclei, spreading of domain walls (DW), and development of areas similar with strip domains, dependently on thickness of the thin layer. Inequivalence of the direct and backward transitions between magnetic states of SF with parallel and antiparallel magnetizations was observed in sample with thin layer thicknesses 0.8 nm and 1.0 nm. Asymmetry of the transition between these states is expressed in difference fluctuation fields and shapes of reversal magnetization nucleus contributing to the correspondent forward and backward transitions. We proposed simple model based on asymmetry of Dzyaloshinskii–Moriya interaction. This model explains competition between nucleation and domain wall propagation due to increase/decrease of the DW energy dependently on direction of the spin rotation into the DW in respect to external field.
{"title":"The effect of Dzyaloshinskii–Moriya interaction on direct and backward transition between magnetic states of Pt/Co/Ir/Co/Pr synthetic ferrimagnet","authors":"A. Talantsev, E. Kunitsyna, R. Morgunov","doi":"10.17277/jamt.2021.03.pp.167-178","DOIUrl":"https://doi.org/10.17277/jamt.2021.03.pp.167-178","url":null,"abstract":"In this paper, we present the study of domain structure accompanying interstate transitions in Pt/Co/Ir/Co/Pr synthetic ferrimagnet (SF) of 1.1 nm thick and 0.6 – 1.0 nm thin ferromagnetic Co layers. Variation in the thickness of the thin layer causes noticeable changes in the domain structure and mechanism of magnetization reversal revealed by MOKE (Magneto-Optical Kerr Effect) technique. Magnetization reversal includes coherent rotation of magnetization of the ferromagnetic layers, generation of magnetic nuclei, spreading of domain walls (DW), and development of areas similar with strip domains, dependently on thickness of the thin layer. Inequivalence of the direct and backward transitions between magnetic states of SF with parallel and antiparallel magnetizations was observed in sample with thin layer thicknesses 0.8 nm and 1.0 nm. Asymmetry of the transition between these states is expressed in difference fluctuation fields and shapes of reversal magnetization nucleus contributing to the correspondent forward and backward transitions. We proposed simple model based on asymmetry of Dzyaloshinskii–Moriya interaction. This model explains competition between nucleation and domain wall propagation due to increase/decrease of the DW energy dependently on direction of the spin rotation into the DW in respect to external field.","PeriodicalId":13355,"journal":{"name":"Image Journal of Advanced Materials and Technologies","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88449348","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}
Pub Date : 2021-01-01DOI: 10.17277/jamt.2021.04.pp.267-278
Y. Khan, T. Dyachkova, E. Bakunin, E. Obraztsova, A. Rukhov, S. Morais
The paper presents a generalized analysis of the results of scanning electron microscopy, energy dispersive spectroscopy, and TG/DSC analysis of electrochemical exfoliation products from two types of initial graphite raw materials at different process temperatures in solutions of potassium hydroxide (KOH) and sulfuric acid (H2SO4). It is shown that an increase in the concentration of an alkaline electrolyte in the range from 0.1 to 1.0 molL–1 promotes the intensification of the process of separation and splitting of graphite into fragments. In the case of the formation of large fragments, the product contains a significant amount of intercalated potassium ions, which are not removed when the material is washed off. The products of electrochemical exfoliation of the spent electrocontact graphite material demonstrate structural heterogeneity, contain a significant amount of functional groups and impurities of the amorphous phase. Thermogravimetric curves have several sections of sample weight reduction. After heating these materials in an inert atmosphere to 900 °C, the total weight loss reaches 66 %. From a thermally expanded graphite foil, samples of nanographites, extremely homogeneous in chemical composition, with increased thermal stability and a minimum number of surface defects were obtained. The total weight loss of the samples when heated in an inert atmosphere to 900 °C does not exceed 17 %. It was shown that the replacement of an alkaline electrolyte with a sulfuric acid solution leads to an increase in the number of defects in the product.
{"title":"A study of the structure and morphology \u0000of the graphite electrochemical exfoliation products","authors":"Y. Khan, T. Dyachkova, E. Bakunin, E. Obraztsova, A. Rukhov, S. Morais","doi":"10.17277/jamt.2021.04.pp.267-278","DOIUrl":"https://doi.org/10.17277/jamt.2021.04.pp.267-278","url":null,"abstract":"The paper presents a generalized analysis of the results of scanning electron microscopy, energy dispersive spectroscopy, and TG/DSC analysis of electrochemical exfoliation products from two types of initial graphite raw materials at different process temperatures in solutions of potassium hydroxide (KOH) and sulfuric acid (H2SO4). It is shown that an increase in the concentration of an alkaline electrolyte in the range from 0.1 to 1.0 molL–1 promotes the intensification of the process of separation and splitting of graphite into fragments. In the case of the formation of large fragments, the product contains a significant amount of intercalated potassium ions, which are not removed when the material is washed off. The products of electrochemical exfoliation of the spent electrocontact graphite material demonstrate structural heterogeneity, contain a significant amount of functional groups and impurities of the amorphous phase. Thermogravimetric curves have several sections of sample weight reduction. After heating these materials in an inert atmosphere to 900 °C, the total weight loss reaches 66 %. From a thermally expanded graphite foil, samples of nanographites, extremely homogeneous in chemical composition, with increased thermal stability and a minimum number of surface defects were obtained. The total weight loss of the samples when heated in an inert atmosphere to 900 °C does not exceed 17 %. It was shown that the replacement of an alkaline electrolyte with a sulfuric acid solution leads to an increase in the number of defects in the product.","PeriodicalId":13355,"journal":{"name":"Image Journal of Advanced Materials and Technologies","volume":"s3-16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90808689","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}
Jeonghun Nam, Jung Yoon, Hyunseul Jee, W. Jang, C. Lim
{"title":"Microfluidic Devices: High‐Throughput Separation of Microvesicles from Whole Blood Components Using Viscoelastic Fluid (Adv. Mater. Technol. 12/2020)","authors":"Jeonghun Nam, Jung Yoon, Hyunseul Jee, W. Jang, C. Lim","doi":"10.1002/admt.202070071","DOIUrl":"https://doi.org/10.1002/admt.202070071","url":null,"abstract":"","PeriodicalId":13355,"journal":{"name":"Image Journal of Advanced Materials and Technologies","volume":"7 1","pages":"2070071"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89340494","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}
Woongbi Cho, D. Hahm, Jaehyun Yim, Jun Hee Lee, Y. Lee, Dong‐Gyun Kim, Yong Seok Kim, J. Wie
{"title":"Hierarchical Structures: Programmable Building Blocks via Internal Stress Engineering for 3D Collective Assembly (Adv. Mater. Technol. 12/2020)","authors":"Woongbi Cho, D. Hahm, Jaehyun Yim, Jun Hee Lee, Y. Lee, Dong‐Gyun Kim, Yong Seok Kim, J. Wie","doi":"10.1002/admt.202070070","DOIUrl":"https://doi.org/10.1002/admt.202070070","url":null,"abstract":"","PeriodicalId":13355,"journal":{"name":"Image Journal of Advanced Materials and Technologies","volume":"58 1","pages":"2070070"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84061253","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}
César Masse de la Huerta, V. Nguyen, A. Sekkat, Chiara Crivello, F. Toldra-Reig, P. Veiga, Serge Quessada, C. Jiménez, D. Muñoz‐Rojas
{"title":"Gas‐Phase 3D Printing: Gas‐Phase 3D Printing of Functional Materials (Adv. Mater. Technol. 12/2020)","authors":"César Masse de la Huerta, V. Nguyen, A. Sekkat, Chiara Crivello, F. Toldra-Reig, P. Veiga, Serge Quessada, C. Jiménez, D. Muñoz‐Rojas","doi":"10.1002/admt.202070074","DOIUrl":"https://doi.org/10.1002/admt.202070074","url":null,"abstract":"","PeriodicalId":13355,"journal":{"name":"Image Journal of Advanced Materials and Technologies","volume":"24 1","pages":"2070074"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73582898","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}
L. Fernández‐Izquierdo, M. G. Reyes-Banda, X. Mathew, I. R. Chavez-Urbiola, Lidia El Bouanani, Joseph Chang, C. Avila-Avendano, N. R. Mathews, M. I. Pintor-Monroy, M. Quevedo-López
{"title":"Neutron Detectors: Cesium Lead Bromide (CsPbBr\u0000 3\u0000 ) Thin‐Film‐Based Solid‐State Neutron Detector Developed by a Solution‐Free Sublimation Process (Adv. Mater. Technol. 12/2020)","authors":"L. Fernández‐Izquierdo, M. G. Reyes-Banda, X. Mathew, I. R. Chavez-Urbiola, Lidia El Bouanani, Joseph Chang, C. Avila-Avendano, N. R. Mathews, M. I. Pintor-Monroy, M. Quevedo-López","doi":"10.1002/admt.202070075","DOIUrl":"https://doi.org/10.1002/admt.202070075","url":null,"abstract":"","PeriodicalId":13355,"journal":{"name":"Image Journal of Advanced Materials and Technologies","volume":"28 1","pages":"2070075"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81062087","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}
Hegeng Li, Y. Duan, Shao Zhilong, Guannan Zhang, Huayang Li, Yongan Huang, Z. Yin
{"title":"QLEDs: High‐Resolution Pixelated Light Emitting Diodes Based on Electrohydrodynamic Printing and Coffee‐Ring‐Free Quantum Dot Film (Adv. Mater. Technol. 10/2020)","authors":"Hegeng Li, Y. Duan, Shao Zhilong, Guannan Zhang, Huayang Li, Yongan Huang, Z. Yin","doi":"10.1002/admt.202070059","DOIUrl":"https://doi.org/10.1002/admt.202070059","url":null,"abstract":"","PeriodicalId":13355,"journal":{"name":"Image Journal of Advanced Materials and Technologies","volume":"1 1","pages":"2070059"},"PeriodicalIF":0.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85351283","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}
O. Tricinci, Daniele De Pasquale, Attilio Marino, M. Battaglini, C. Pucci, G. Ciofani
{"title":"Microfluidic Systems: A 3D Biohybrid Real‐Scale Model of the Brain Cancer Microenvironment for Advanced In Vitro Testing (Adv. Mater. Technol. 10/2020)","authors":"O. Tricinci, Daniele De Pasquale, Attilio Marino, M. Battaglini, C. Pucci, G. Ciofani","doi":"10.1002/admt.202070063","DOIUrl":"https://doi.org/10.1002/admt.202070063","url":null,"abstract":"","PeriodicalId":13355,"journal":{"name":"Image Journal of Advanced Materials and Technologies","volume":"6 1","pages":"2070063"},"PeriodicalIF":0.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84130056","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}
Wedyan Babatain, A. Gumus, Irmandy Wicaksono, U. Buttner, Nazek El‐atab, M. Rehman, N. Qaiser, D. Conchouso, M. Hussain
{"title":"Personalized Healthcare: Expandable Polymer Assisted Wearable Personalized Medicinal Platform (Adv. Mater. Technol. 10/2020)","authors":"Wedyan Babatain, A. Gumus, Irmandy Wicaksono, U. Buttner, Nazek El‐atab, M. Rehman, N. Qaiser, D. Conchouso, M. Hussain","doi":"10.1002/admt.202070064","DOIUrl":"https://doi.org/10.1002/admt.202070064","url":null,"abstract":"","PeriodicalId":13355,"journal":{"name":"Image Journal of Advanced Materials and Technologies","volume":"15 1","pages":"2070064"},"PeriodicalIF":0.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78448425","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：