首页 > 最新文献

Ukrainian Journal of Physics最新文献

英文 中文
Peculiarities of Eu3+ Photoluminescence in Opal Photonic Crystal Films and Heterostructures Based of Them 蛋白石光子晶体薄膜及其异质结构中 Eu3+ 光致发光的特殊性
IF 0.5 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-06 DOI: 10.15407/ujpe68.12.785
V. S. Mukharovska, M. Derhachov, V.M. Moiseienko, B. Abu Sal
Single opal films and heterostructures based on them grown by the method of vertically moving meniscus are characterized by the reflection spectroscopy technique and then impregnated with the Eu(CH3COO)3 × H2O salt. The suppression of the Eu3+ ion emission in single opal films is clearly detected within the photonic stop-band range. The weaker manifestation of this effect in heterostructures is more likely due to interface defects causing both the appearance of permitted states in the photonic stop band and the scattering of radiation in the direction of observation. With the further impregnation of opal films with glycerol to reduce the dielectric contrast from 1.85 to 1.13, the emission spectrum is mainly determined by the Eu3+ coordination environment effects accompanied with the broadening of bands and the spectral intensity redistribution.
通过反射光谱技术对垂直移动半月板法生长的单蛋白石薄膜和基于它们的异质结构进行了表征,然后用 Eu(CH3COO)3 × H2O 盐进行了浸渍。在光子止带范围内,可以清楚地检测到单层蛋白石薄膜中 Eu3+ 离子发射的抑制作用。这种效应在异质结构中的表现较弱,更有可能是由于界面缺陷导致光子止带中出现允许态以及观察方向上的辐射散射。在进一步用甘油浸渍蛋白石薄膜,使介电常数对比度从 1.85 降至 1.13 后,发射光谱主要由 Eu3+ 配位环境效应决定,并伴随着谱带的拓宽和光谱强度的重新分布。
{"title":"Peculiarities of Eu3+ Photoluminescence in Opal Photonic Crystal Films and Heterostructures Based of Them","authors":"V. S. Mukharovska, M. Derhachov, V.M. Moiseienko, B. Abu Sal","doi":"10.15407/ujpe68.12.785","DOIUrl":"https://doi.org/10.15407/ujpe68.12.785","url":null,"abstract":"Single opal films and heterostructures based on them grown by the method of vertically moving meniscus are characterized by the reflection spectroscopy technique and then impregnated with the Eu(CH3COO)3 × H2O salt. The suppression of the Eu3+ ion emission in single opal films is clearly detected within the photonic stop-band range. The weaker manifestation of this effect in heterostructures is more likely due to interface defects causing both the appearance of permitted states in the photonic stop band and the scattering of radiation in the direction of observation. With the further impregnation of opal films with glycerol to reduce the dielectric contrast from 1.85 to 1.13, the emission spectrum is mainly determined by the Eu3+ coordination environment effects accompanied with the broadening of bands and the spectral intensity redistribution.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":"11 47","pages":""},"PeriodicalIF":0.5,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139380162","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}
引用次数: 0
Особливості досліджень поверхні плівок ZnO–SiO2 методом мультифрактального аналізу 通过多分形分析研究氧化锌-二氧化硅薄膜表面的特殊性
IF 0.5 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-06 DOI: 10.15407/ujpe68.12.822
N. Balytska, P. P. Moskvin, G. Skyba, L.V. Rashkovetskyi, V. Kryzhanivskyy, L.G. Polonskyi
На прикладi мультифрактального аналiзу (МФА) зображень поверхонь наноплiвок, що синтезувалися золь-гель технологiєю в системi ZnО–SiO2, обговорюються особливостi застосування цього методу при отриманнi кiлькiсних характеристик поверхнi. Вхiдною iнформацiєю для реалiзацiї цього пiдходу до опису стану поверхонь були Second electron microscopy (SEM) зображення поверхнi зразкiв пiсля їх синтезу в заданих умовах. Чисельними розрахунками узагальнених статистичних сум для площi та об’ємiв просторових наноформ показано iснування їх лiнiйних залежностей вiд просторових розмiрiв, що є основним доказом наявностi самоподiбностi та фрактальної симетрiї серед зазначених геометричних параметрiв поверхнi. Наголошується на необхiдностi пiдвищення надiйностi визначення параметрiв МФ спектрiв та аналiзуються причини, що контролюють точнiсть абсолютних значень чисел Реньї. Вироблено рекомендацiї для мiнiмiзацiї похибок з метою отримання найбiльш вiрогiдних даних щодо МФ параметрiв поверхнi. Наведено залежностi чисел Реньї вiд температури синтезу шарiв ZnO–SiO2 золь-гель методом. Звертається увага на те, що для подальшого застосування результатiв МФА у фiзичних розрахунках необхiдно коректно вибирати тi числа Реньї, якi несуть у собi необхiдну iнформацiйну компоненту за модельованим фрактальним параметром. Обговорюються фiзичнi причини появи взаємозв’язку мiж параметрами МФ спектрiв для площi поверхнi та об’ємiв наноформ, що формуються на поверхнi плiвок, та умовами їх синтезу.
以氧化锌-二氧化硅体系中通过溶胶-凝胶技术合成的纳米薄膜表面图像的多分形分析(MFA)为例,讨论了使用这种方法获得定量表面特征的特殊性。采用这种方法描述表面状态的输入信息是样品在特定条件下合成后的第二代电子显微镜(SEM)表面图像。对空间纳米棒的面积和体积进行的广义统计和数值计算表明,它们与空间尺寸存在线性关系,这是表面这些几何参数存在自相似性和分形对称性的主要证据。强调了提高确定中频光谱参数可靠性的必要性,并分析了控制瑞利数绝对值精度的原因。提出了尽量减少误差的建议,以便获得最可靠的表面中频参数数据。介绍了雷利数与溶胶-凝胶法合成氧化锌-二氧化硅层的温度的关系。研究强调,要在物理计算中进一步应用 MFA 结果,就必须正确选择那些能为模型分形参数提供必要信息成分的雷利数。讨论了薄膜表面形成的纳米棒的表面积和体积的 MF 光谱参数与其合成条件之间关系的物理原因。
{"title":"Особливості досліджень поверхні плівок ZnO–SiO2 методом мультифрактального аналізу","authors":"N. Balytska, P. P. Moskvin, G. Skyba, L.V. Rashkovetskyi, V. Kryzhanivskyy, L.G. Polonskyi","doi":"10.15407/ujpe68.12.822","DOIUrl":"https://doi.org/10.15407/ujpe68.12.822","url":null,"abstract":"На прикладi мультифрактального аналiзу (МФА) зображень поверхонь наноплiвок, що синтезувалися золь-гель технологiєю в системi ZnО–SiO2, обговорюються особливостi застосування цього методу при отриманнi кiлькiсних характеристик поверхнi. Вхiдною iнформацiєю для реалiзацiї цього пiдходу до опису стану поверхонь були Second electron microscopy (SEM) зображення поверхнi зразкiв пiсля їх синтезу в заданих умовах. Чисельними розрахунками узагальнених статистичних сум для площi та об’ємiв просторових наноформ показано iснування їх лiнiйних залежностей вiд просторових розмiрiв, що є основним доказом наявностi самоподiбностi та фрактальної симетрiї серед зазначених геометричних параметрiв поверхнi. Наголошується на необхiдностi пiдвищення надiйностi визначення параметрiв МФ спектрiв та аналiзуються причини, що контролюють точнiсть абсолютних значень чисел Реньї. Вироблено рекомендацiї для мiнiмiзацiї похибок з метою отримання найбiльш вiрогiдних даних щодо МФ параметрiв поверхнi. Наведено залежностi чисел Реньї вiд температури синтезу шарiв ZnO–SiO2 золь-гель методом. Звертається увага на те, що для подальшого застосування результатiв МФА у фiзичних розрахунках необхiдно коректно вибирати тi числа Реньї, якi несуть у собi необхiдну iнформацiйну компоненту за модельованим фрактальним параметром. Обговорюються фiзичнi причини появи взаємозв’язку мiж параметрами МФ спектрiв для площi поверхнi та об’ємiв наноформ, що формуються на поверхнi плiвок, та умовами їх синтезу.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":"7 10","pages":""},"PeriodicalIF":0.5,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139380806","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}
引用次数: 0
Laser-Induced Transformations in Thermally Evaporated Thin TlInSe2 Films Studied by Raman Spectroscopy 通过拉曼光谱研究热蒸发 TlInSe2 薄膜中的激光诱导转变
IF 0.5 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-06 DOI: 10.15407/ujpe68.12.816
Y. Azhniuk, A. Gomonnai, V. Lopushansky, O. Gomonnai, T. Babuka, V. Loya, I. Voynarovych
TlInSe2 films with thickness from 10 to 200 nm were thermally evaporated on silicon and silicate glass substrates. Micro-Raman spectra measured at a moderate excitation (532 nm, 4 kW/cm2) confirm the amorphous character of the films. Narrow features revealed in the spectra at an excitation power density of 40 kW/cm2 show the evidence for the formation of TlInSe2 , TlSe, and In2Se3 crystallites in the laser spot. For thin (10–30 nm) films, the rod-shaped TlInSe2 crystallites are shown to be oriented within the film plane. The crystallite formation is governed by the thermal effect of the tightly focused laser beam.
在硅和硅酸盐玻璃基底上热蒸发了厚度从 10 纳米到 200 纳米的 TlInSe2 薄膜。在中等激发下(532 nm,4 kW/cm2)测量的微拉曼光谱证实了薄膜的非晶特性。在激发功率密度为 40 kW/cm2 时,光谱中显示的窄特征表明在激光光斑中形成了 TlInSe2、TlSe 和 In2Se3 晶体。对于薄(10-30 nm)薄膜,棒状 TlInSe2 晶体显示出在薄膜平面内定向。结晶的形成受激光束紧密聚焦的热效应影响。
{"title":"Laser-Induced Transformations in Thermally Evaporated Thin TlInSe2 Films Studied by Raman Spectroscopy","authors":"Y. Azhniuk, A. Gomonnai, V. Lopushansky, O. Gomonnai, T. Babuka, V. Loya, I. Voynarovych","doi":"10.15407/ujpe68.12.816","DOIUrl":"https://doi.org/10.15407/ujpe68.12.816","url":null,"abstract":"TlInSe2 films with thickness from 10 to 200 nm were thermally evaporated on silicon and silicate glass substrates. Micro-Raman spectra measured at a moderate excitation (532 nm, 4 kW/cm2) confirm the amorphous character of the films. Narrow features revealed in the spectra at an excitation power density of 40 kW/cm2 show the evidence for the formation of TlInSe2 , TlSe, and In2Se3 crystallites in the laser spot. For thin (10–30 nm) films, the rod-shaped TlInSe2 crystallites are shown to be oriented within the film plane. The crystallite formation is governed by the thermal effect of the tightly focused laser beam.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":"13 2","pages":""},"PeriodicalIF":0.5,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139380578","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}
引用次数: 0
Fullerene-Amyloid Complexes as Perspective Nanocomposites: Molecular Docking Studies 作为透视纳米复合材料的富勒烯-淀粉样蛋白复合物:分子对接研究
IF 0.5 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-06 DOI: 10.15407/ujpe68.12.807
V. Trusova, P.E. Kuznietsov, O. Zhytniakivska, U. Tarabara, K.A. Vus, G.P. Gorbenko
The molecular interactions between the amyloid fibrils from Aβ-peptide, insulin and α-synuclein and fullerenes of different sizes, including C20, C36, C60, C70, and C84, have been studied using the molecular docking approach. The fullerenes are found to bind to the loop or turn region of Aβ- and α-synuclein fibrillar assemblies, but reside at the end of insulin amyloid fibers, reflecting the lower affinity of carbon nanostructures to the latter aggregated protein. For all systems studied here, the fullerene binding to amyloid fibrils is size-dependent, with larger fullerenes exhibiting a higher binding affinity and a lower total energy of complexation. The analysis of side chain contacts highlights the pivotal role of van der Waals forces, specifically, alkyl and π-alkyl interactions, in the stabilization of the fullerene-amyloid complexes. The results obtained are discussed in terms of novel nanocomposite materials based on carbon nanoparticles and fibrillar proteins, as well as of the fullerene role in anti-amyloid therapy.
利用分子对接方法研究了来自 Aβ-肽、胰岛素和 α-突触核蛋白的淀粉样纤维与不同大小的富勒烯(包括 C20、C36、C60、C70 和 C84)之间的分子相互作用。研究发现,富勒烯能与 Aβ-和 α-突触核蛋白纤维状集合体的环状或转折区结合,但却停留在胰岛素淀粉样蛋白纤维的末端,这反映出碳纳米结构对后者聚集蛋白的亲和力较低。在本文研究的所有系统中,富勒烯与淀粉样蛋白纤维的结合与尺寸有关,尺寸较大的富勒烯具有较高的结合亲和力和较低的络合总能量。对侧链接触的分析凸显了范德华力,特别是烷基和π-烷基相互作用在稳定富勒烯-淀粉样蛋白复合物中的关键作用。本文从基于碳纳米粒子和纤维蛋白的新型纳米复合材料以及富勒烯在抗淀粉样蛋白治疗中的作用两个方面讨论了所获得的结果。
{"title":"Fullerene-Amyloid Complexes as Perspective Nanocomposites: Molecular Docking Studies","authors":"V. Trusova, P.E. Kuznietsov, O. Zhytniakivska, U. Tarabara, K.A. Vus, G.P. Gorbenko","doi":"10.15407/ujpe68.12.807","DOIUrl":"https://doi.org/10.15407/ujpe68.12.807","url":null,"abstract":"The molecular interactions between the amyloid fibrils from Aβ-peptide, insulin and α-synuclein and fullerenes of different sizes, including C20, C36, C60, C70, and C84, have been studied using the molecular docking approach. The fullerenes are found to bind to the loop or turn region of Aβ- and α-synuclein fibrillar assemblies, but reside at the end of insulin amyloid fibers, reflecting the lower affinity of carbon nanostructures to the latter aggregated protein. For all systems studied here, the fullerene binding to amyloid fibrils is size-dependent, with larger fullerenes exhibiting a higher binding affinity and a lower total energy of complexation. The analysis of side chain contacts highlights the pivotal role of van der Waals forces, specifically, alkyl and π-alkyl interactions, in the stabilization of the fullerene-amyloid complexes. The results obtained are discussed in terms of novel nanocomposite materials based on carbon nanoparticles and fibrillar proteins, as well as of the fullerene role in anti-amyloid therapy.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":"13 2","pages":""},"PeriodicalIF":0.5,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139380775","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}
引用次数: 0
Existence of Small-Amplitude Double Layers in Two-Temperature Non-Isothermal Plasma 双温非等温等离子体中小振幅双层的存在
IF 0.5 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-01-06 DOI: 10.15407/ujpe68.12.795
S. Chattopadhyay
In the presence of warm negative ions, ion-acoustic small-amplitude monotonic double layers are theoretically investigated in a plasma consisting of warm positive ions, warm positrons, and two-temperature non-isothermal electrons under the variation of the trapping parameters of electrons, concentration of positrons, and mass ratios of heavier negative ions to lighter positive ions by the Sagdeev pseudopotential method. The corresponding double layer solutions are also discussed for the same variation. Consequently, ion-acoustic solitary waves and double layers have been observed in auroral and magnetospheric plasmas with two-temperature electron distributions found in a laboratory, as well as in the space. This paper shows the effects of trapping parameters of electrons, positron concentration, and mass ratios of heavier negative ions to lighter positive ions on the Sagdeev potential function ψ(φ) and double layer solutions φDL for small-amplitude monotonic double layers. The results are presented graphically in Figs. 1 to 6.
在暖负离子存在的情况下,通过萨格迪夫假势法,理论研究了在由暖正离子、暖正电子和双温非等温电子组成的等离子体中,在电子的捕获参数、正电子的浓度以及较重负离子与较轻正离子的质量比发生变化时的离子声小振幅单调双层。同时还讨论了相同变化下的相应双层解。因此,在实验室和太空中发现的具有双温电子分布的极光和磁层等离子体中观测到了离子声孤波和双层。本文展示了电子俘获参数、正电子浓度以及较重负离子与较轻正离子的质量比对小振幅单调双层的萨格迪夫势函数ψ(φ)和双层解φDL的影响。结果如图 1 至图 6 所示。
{"title":"Existence of Small-Amplitude Double Layers in Two-Temperature Non-Isothermal Plasma","authors":"S. Chattopadhyay","doi":"10.15407/ujpe68.12.795","DOIUrl":"https://doi.org/10.15407/ujpe68.12.795","url":null,"abstract":"In the presence of warm negative ions, ion-acoustic small-amplitude monotonic double layers are theoretically investigated in a plasma consisting of warm positive ions, warm positrons, and two-temperature non-isothermal electrons under the variation of the trapping parameters of electrons, concentration of positrons, and mass ratios of heavier negative ions to lighter positive ions by the Sagdeev pseudopotential method. The corresponding double layer solutions are also discussed for the same variation. Consequently, ion-acoustic solitary waves and double layers have been observed in auroral and magnetospheric plasmas with two-temperature electron distributions found in a laboratory, as well as in the space. This paper shows the effects of trapping parameters of electrons, positron concentration, and mass ratios of heavier negative ions to lighter positive ions on the Sagdeev potential function ψ(φ) and double layer solutions φDL for small-amplitude monotonic double layers. The results are presented graphically in Figs. 1 to 6.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":"8 2","pages":""},"PeriodicalIF":0.5,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139380631","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}
引用次数: 0
Температурна і концентраційна залежність дзета-потенціалу макромолекул альбуміну у водно-сольовому розчині згідно з комірковою моделлю 根据细胞模型分析白蛋白大分子在盐水溶液中的 zeta 电位与温度和浓度的关系
IF 0.5 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2023-12-18 DOI: 10.15407/ujpe68.11.742
O.D. Stoliaryk, A. A. Guslisty, O. Khorolskyi
За допомогою комiркової моделi побудовано концентрацiйнi залежностi дзета-потенцiалу сироваткового альбумiну людини у водно-сольових розчинах; знайдено теоретичнi залежностi дзета-потенцiалу водно-сольових розчинiв сироваткового альбумiну людини вiд концентрацiї хлориду натрiю для рiзних концентрацiй альбумiну: а) за двох рiзних температур, 300 К та 318 К; б) за рiзних значень радiуса альбумiну, 40 Å та 45 Å. Виявлено, що змiна температури в розглянутих межах суттєво не впливає на дзета-потенцiал водно-сольових розчинiв альбумiну; збiльшення радiуса молекули на 5 Å приводить до помiтного зменшення дзета-потенцiалу вiд 3 до 10 одиниць в залежностi вiд концентрацiї солi. Отриманi данi є базисом для iнтерпретацiї значень дзета-потенцiалу альбумiну за наявностi рiзних патологiчних станiв.
利用细胞模型构建了盐水溶液中人血清白蛋白 zeta 电位的浓度相关性;发现了不同浓度白蛋白的盐水溶液的 zeta 电位与氯化钠浓度的理论相关性:a) 两种不同的温度(300 K 和 318 K);b) 不同的白蛋白半径值(40 Å 和 45 Å)。研究发现,在所考虑的范围内,温度的变化不会对白蛋白水-盐溶液的 zeta 电位产生显著影响;分子半径增加 5 Å 会导致 zeta 电位明显下降 3 至 10 个单位,具体取决于盐浓度。所获得的数据是解释白蛋白在各种病理条件下的 zeta 电位值的基础。
{"title":"Температурна і концентраційна залежність дзета-потенціалу макромолекул альбуміну у водно-сольовому розчині згідно з комірковою моделлю","authors":"O.D. Stoliaryk, A. A. Guslisty, O. Khorolskyi","doi":"10.15407/ujpe68.11.742","DOIUrl":"https://doi.org/10.15407/ujpe68.11.742","url":null,"abstract":"За допомогою комiркової моделi побудовано концентрацiйнi залежностi дзета-потенцiалу сироваткового альбумiну людини у водно-сольових розчинах; знайдено теоретичнi залежностi дзета-потенцiалу водно-сольових розчинiв сироваткового альбумiну людини вiд концентрацiї хлориду натрiю для рiзних концентрацiй альбумiну: а) за двох рiзних температур, 300 К та 318 К; б) за рiзних значень радiуса альбумiну, 40 Å та 45 Å. Виявлено, що змiна температури в розглянутих межах суттєво не впливає на дзета-потенцiал водно-сольових розчинiв альбумiну; збiльшення радiуса молекули на 5 Å приводить до помiтного зменшення дзета-потенцiалу вiд 3 до 10 одиниць в залежностi вiд концентрацiї солi. Отриманi данi є базисом для iнтерпретацiї значень дзета-потенцiалу альбумiну за наявностi рiзних патологiчних станiв.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":"37 9","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176001","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}
引用次数: 0
Effect of Calcination Temperature and Substitution of Erbium on Structural and Optical Properties of Nickel Zinc Ferrite Nanoparticles 煅烧温度和铒替代物对镍锌铁氧体纳米粒子结构和光学特性的影响
IF 0.5 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2023-12-18 DOI: 10.15407/ujpe68.11.772
K. Vijaya Kumar, S. D. Bhavani
A single composition of erbium-doped nickel zinc ferrite Ni0.5Zn0.5Fe1.95Er0.05O4 is synthesized by the sol-gel autocombustion process. The prepared composition was divided into five equal parts. One of the parts was an as-prepared sample, and remaining four other parts were calcinated at 600, 700, 800, and 900 ∘C to investigate the variation in structural and optical properties with the calcination temperature. The structural characterization was performed using XRD and SEM. Optical properties were analyzed using FTIR and UV-Visible spectral data. XRD patterns confirm the spinel cubic crystal structure and the Fd3m space group. The crystallite size was minimum for the as-prepared sample (17.9452 nm), and the crystallite size was maximum for the sample calcinated at 900 ∘C (29.8481 nm). SEM images revealed the grain size in the interval from 55.38 nm to 177.73 nm, and certain nanotubes were formed in the sample calcinated at 800 ∘C. Optical energy band gap was observed in the interval from 5.556 eV to 3.969 eV. All these testifies to the variations in structural and optical properties of Ni0.5Zn0.5Fe1.95Er0.05O4 with the calcination temperature.
采用溶胶-凝胶自燃烧工艺合成了单一成分的掺铒镍锌铁氧体 Ni0.5Zn0.5Fe1.95Er0.05O4。制备的成分被分成五个等份。其中一部分是原样,其余四部分分别在 600、700、800 和 900 ℃ 下煅烧,以研究结构和光学特性随煅烧温度的变化。使用 XRD 和 SEM 进行了结构表征。傅立叶变换红外光谱和紫外-可见光谱数据分析了光学特性。XRD 图谱证实了尖晶石立方晶体结构和 Fd3m 空间群。未制备样品的晶粒尺寸最小(17.9452 nm),而在 900 ↪So_Sm_2218↩C 煅烧的样品的晶粒尺寸最大(29.8481 nm)。扫描电子显微镜图像显示晶粒大小在 55.38 nm 至 177.73 nm 之间,在 800 ∘C 煅烧的样品中形成了一些纳米管。光能带隙在 5.556 eV 至 3.969 eV 之间。所有这些都证明了 Ni0.5Zn0.5Fe1.95Er0.05O4 的结构和光学特性随煅烧温度的变化而变化。
{"title":"Effect of Calcination Temperature and Substitution of Erbium on Structural and Optical Properties of Nickel Zinc Ferrite Nanoparticles","authors":"K. Vijaya Kumar, S. D. Bhavani","doi":"10.15407/ujpe68.11.772","DOIUrl":"https://doi.org/10.15407/ujpe68.11.772","url":null,"abstract":"A single composition of erbium-doped nickel zinc ferrite Ni0.5Zn0.5Fe1.95Er0.05O4 is synthesized by the sol-gel autocombustion process. The prepared composition was divided into five equal parts. One of the parts was an as-prepared sample, and remaining four other parts were calcinated at 600, 700, 800, and 900 ∘C to investigate the variation in structural and optical properties with the calcination temperature. The structural characterization was performed using XRD and SEM. Optical properties were analyzed using FTIR and UV-Visible spectral data. XRD patterns confirm the spinel cubic crystal structure and the Fd3m space group. The crystallite size was minimum for the as-prepared sample (17.9452 nm), and the crystallite size was maximum for the sample calcinated at 900 ∘C (29.8481 nm). SEM images revealed the grain size in the interval from 55.38 nm to 177.73 nm, and certain nanotubes were formed in the sample calcinated at 800 ∘C. Optical energy band gap was observed in the interval from 5.556 eV to 3.969 eV. All these testifies to the variations in structural and optical properties of Ni0.5Zn0.5Fe1.95Er0.05O4 with the calcination temperature.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":"48 5","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139174850","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}
引用次数: 0
Intermolecular Interactions in Liquid Propionic Acid and Its Solutions: Raman and DFT Study 液态丙酸及其溶液中的分子间相互作用:拉曼和 DFT 研究
IF 0.5 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2023-12-18 DOI: 10.15407/ujpe68.11.750
A. Jumabaev, A. Absanov, H. Hushvaktov, L.A. Bulavin
The mechanism of molecular complex formation in liquid propionic acid and its solutions is investigated. The anisotropic component of the Raman band of the C=O stretching vibration of pure propionic acid consists of three bands with maxima at 1661, 1700, and 1753 cm−1. The effect of varying the concentrations of solvents such as CCl4, acetonitrile, and water on this vibration mode is studied. The mechanism of formation of molecular complexes in solutions is determined using DFT calculations at the B3LYP/6-311++G(d,p) level of theory. The AIM, RDG, and NCI topological analyses are also performed to investigate the intermolecular interactions in the complexes.
研究了液态丙酸及其溶液中分子复合物的形成机理。纯丙酸的 C=O 伸展振动拉曼光谱带的各向异性成分包括三个波段,最大值分别为 1661、1700 和 1753 cm-1。研究了不同浓度的溶剂(如四氯化碳、乙腈和水)对该振动模式的影响。利用 B3LYP/6-311++G(d,p) 理论水平的 DFT 计算确定了分子复合物在溶液中的形成机理。此外,还进行了 AIM、RDG 和 NCI 拓扑分析,以研究络合物中的分子间相互作用。
{"title":"Intermolecular Interactions in Liquid Propionic Acid and Its Solutions: Raman and DFT Study","authors":"A. Jumabaev, A. Absanov, H. Hushvaktov, L.A. Bulavin","doi":"10.15407/ujpe68.11.750","DOIUrl":"https://doi.org/10.15407/ujpe68.11.750","url":null,"abstract":"The mechanism of molecular complex formation in liquid propionic acid and its solutions is investigated. The anisotropic component of the Raman band of the C=O stretching vibration of pure propionic acid consists of three bands with maxima at 1661, 1700, and 1753 cm−1. The effect of varying the concentrations of solvents such as CCl4, acetonitrile, and water on this vibration mode is studied. The mechanism of formation of molecular complexes in solutions is determined using DFT calculations at the B3LYP/6-311++G(d,p) level of theory. The AIM, RDG, and NCI topological analyses are also performed to investigate the intermolecular interactions in the complexes.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":"50 ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139174135","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}
引用次数: 0
Структурні та морфологічні властивості нанометрових вуглецевих плівок, отриманих розпиленням графіту електронним променем 用电子束溅射石墨获得的纳米碳薄膜的结构和形态特性
IF 0.5 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2023-12-18 DOI: 10.15407/ujpe68.11.764
V. Yukhymchuk, V. Dzhagan, O.F. Isaieva, P. Lytvyn, A.A. Korchovyi, T.M. Sabov, V.B. Lozinskii, V.S. Yefanov, V.O. Osokin, Yu.A. Kurapov
Методом електронного розпилення графiту отримано нанометровi вуглецевi плiвки на металевих (мiдних, сталевих) та кремнiєвих пiдкладинках. Температура пiдкладок варiювалася вiд 350 до 600 оС з кроком 50 оС, а час напилення – вiд 1 до 10 с. Отриманi вуглецевi плiвки характеризувалися методами раманiвської спектроскопiї, X-променевої фотоелектронної спектроскопiї (XPS), атомно-силової мiкроскопiї та електронного парамагнiтного резонансу (EPR). З аналiзу раманiвських спектрiв встановлено, що при температурах металевих пiдкладок до 400 оС, сформованi на них вуглецевi плiвки є аморфними, при вищих температурах мають графiтоподiбну структуру. На кремнiєвих пiдкладинках при всiх температурах до 600 оС формуються аморфнi вуглецевi плiвки. Отриманi результати з раманiвських спектрiв корелюють з даними XPS. Показано, що на морфологiю плiвок впливає як температура пiдкладок, так i їхнiй тип (металева чи кремнiєва). Зi збiльшенням температури пiдкладок вiд 350 до 600 оС середнi розмiри нерiвностей на поверхнi вуглецевих плiвок зростають як на металевих, так i на кремнiєвiй пiдкладинках. EPR дослiдження показали, що наявнi в плiвках структурнi дефекти, якi зумовлюють прояв у раманiвських спектрах так званих дефектних смуг (D та D′), є не парамагнiтними.
通过电子溅射石墨烯,在金属(铜、钢)和硅基底上获得了纳米长的碳薄膜。基底的温度变化范围为 350 ℃ 至 600 ℃,步长为 50 ℃,溅射时间为 1 秒至 10 秒。拉曼光谱、X 射线光电子能谱 (XPS)、原子力显微镜和电子顺磁共振 (EPR) 对获得的碳薄膜进行了表征。通过分析拉曼光谱发现,在温度不超过 400 °C 的金属基底上形成的碳薄膜是无定形的,而在更高的温度下,它们具有类似石墨的结构。在 600 ℃ 以下的所有温度下,硅基底上都会形成无定形碳膜。拉曼光谱得出的结果与 XPS 数据相关。结果表明,薄膜的形态受基底温度和基底类型(金属或硅)的影响。随着基底温度从 350 ℃ 升高到 600 ℃,碳薄膜表面不均匀的平均尺寸在金属和硅基底上都会增大。EPR 研究表明,导致拉曼光谱中出现所谓缺陷带(D 和 D′)的薄膜中存在的结构缺陷不是顺磁性的。
{"title":"Структурні та морфологічні властивості нанометрових вуглецевих плівок, отриманих розпиленням графіту електронним променем","authors":"V. Yukhymchuk, V. Dzhagan, O.F. Isaieva, P. Lytvyn, A.A. Korchovyi, T.M. Sabov, V.B. Lozinskii, V.S. Yefanov, V.O. Osokin, Yu.A. Kurapov","doi":"10.15407/ujpe68.11.764","DOIUrl":"https://doi.org/10.15407/ujpe68.11.764","url":null,"abstract":"Методом електронного розпилення графiту отримано нанометровi вуглецевi плiвки на металевих (мiдних, сталевих) та кремнiєвих пiдкладинках. Температура пiдкладок варiювалася вiд 350 до 600 оС з кроком 50 оС, а час напилення – вiд 1 до 10 с. Отриманi вуглецевi плiвки характеризувалися методами раманiвської спектроскопiї, X-променевої фотоелектронної спектроскопiї (XPS), атомно-силової мiкроскопiї та електронного парамагнiтного резонансу (EPR). З аналiзу раманiвських спектрiв встановлено, що при температурах металевих пiдкладок до 400 оС, сформованi на них вуглецевi плiвки є аморфними, при вищих температурах мають графiтоподiбну структуру. На кремнiєвих пiдкладинках при всiх температурах до 600 оС формуються аморфнi вуглецевi плiвки. Отриманi результати з раманiвських спектрiв корелюють з даними XPS. Показано, що на морфологiю плiвок впливає як температура пiдкладок, так i їхнiй тип (металева чи кремнiєва). Зi збiльшенням температури пiдкладок вiд 350 до 600 оС середнi розмiри нерiвностей на поверхнi вуглецевих плiвок зростають як на металевих, так i на кремнiєвiй пiдкладинках. EPR дослiдження показали, що наявнi в плiвках структурнi дефекти, якi зумовлюють прояв у раманiвських спектрах так званих дефектних смуг (D та D′), є не парамагнiтними.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":"202 ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175198","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}
引用次数: 0
Anisotropic Darcy–Brinkman Magnetic Fluid Convection under the Influence of a Time-Dependent Sinusoidal Magnetic Field 随时间变化的正弦磁场影响下的各向异性达西-布林克曼磁性流体对流
IF 0.5 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2023-12-18 DOI: 10.15407/ujpe68.11.730
C. Balaji, S. Maruthamanikandan, C. Rudresha, V. Vidya Shree
The impact of the sinusoidal mode of a magnetic field involving time fluctuations on the threshold of the ferromagnetic smart liquid convection in a saturated permeable medium is investigated using the regular perturbation technique. The Darcy–Brinkman model with anisotropic permeability is used to describe the flow through porous media. The thermal anisotropy is implemented in the energy equation. The problem might be useful in thermal engineering applications such as dynamic loudspeakers and computer hard discs and in medical applications like the treatment of tumor cells and the cell separation, to name a few. The regular perturbation technique is based on the minimum amplitude of a magnetic field modulation, and the onset criterion is dealt with in terms of a correction in the critical Rayleigh number and wavenumber. The thermal Rayleigh number correction depends on the magnetic field modulation frequency, magnetic force, anisotropies, porosity, and Prandtl number. At moderate values of the magnetic field modulation frequency, the impact of various physical factors is perceived to be noteworthy. The influences of the magnetic mechanism, Prandtl number, porosity parameter, and Brinkman number are shown to augment the destabilizing effect of the magnetic field modulation for moderate values of the frequency of a modulation. However, the destabilizing effect of the magnetic field modulation is diminished due to an increase in the values of the mechanical anisotropy parameter and thermal anisotropy parameter. The study reveals that the effect of the magnetic field modulation could be exploited to control the convective instability in an anisotropic porous medium saturated by a ferromagnetic fluid.
利用正则扰动技术研究了涉及时间波动的磁场正弦模式对饱和渗透介质中铁磁智能液体对流阈值的影响。采用具有各向异性渗透性的达西-布林克曼模型来描述流经多孔介质的流动。热各向异性在能量方程中得以实现。这个问题在热工程应用(如动态扬声器和计算机硬盘)和医学应用(如肿瘤细胞治疗和细胞分离)中可能很有用。常规扰动技术基于磁场调制的最小振幅,而起始标准则根据临界瑞利数和波数修正来处理。热雷利数修正取决于磁场调制频率、磁力、各向异性、孔隙度和普朗特数。在中等磁场调制频率值下,各种物理因素的影响值得注意。磁机制、普朗特数、孔隙度参数和布林克曼数的影响表明,在中等调制频率值时,磁场调制的失稳效应会增强。然而,随着机械各向异性参数和热各向异性参数值的增加,磁场调制的失稳效应会减弱。研究表明,磁场调制效应可用于控制铁磁流体饱和的各向异性多孔介质中的对流不稳定性。
{"title":"Anisotropic Darcy–Brinkman Magnetic Fluid Convection under the Influence of a Time-Dependent Sinusoidal Magnetic Field","authors":"C. Balaji, S. Maruthamanikandan, C. Rudresha, V. Vidya Shree","doi":"10.15407/ujpe68.11.730","DOIUrl":"https://doi.org/10.15407/ujpe68.11.730","url":null,"abstract":"The impact of the sinusoidal mode of a magnetic field involving time fluctuations on the threshold of the ferromagnetic smart liquid convection in a saturated permeable medium is investigated using the regular perturbation technique. The Darcy–Brinkman model with anisotropic permeability is used to describe the flow through porous media. The thermal anisotropy is implemented in the energy equation. The problem might be useful in thermal engineering applications such as dynamic loudspeakers and computer hard discs and in medical applications like the treatment of tumor cells and the cell separation, to name a few. The regular perturbation technique is based on the minimum amplitude of a magnetic field modulation, and the onset criterion is dealt with in terms of a correction in the critical Rayleigh number and wavenumber. The thermal Rayleigh number correction depends on the magnetic field modulation frequency, magnetic force, anisotropies, porosity, and Prandtl number. At moderate values of the magnetic field modulation frequency, the impact of various physical factors is perceived to be noteworthy. The influences of the magnetic mechanism, Prandtl number, porosity parameter, and Brinkman number are shown to augment the destabilizing effect of the magnetic field modulation for moderate values of the frequency of a modulation. However, the destabilizing effect of the magnetic field modulation is diminished due to an increase in the values of the mechanical anisotropy parameter and thermal anisotropy parameter. The study reveals that the effect of the magnetic field modulation could be exploited to control the convective instability in an anisotropic porous medium saturated by a ferromagnetic fluid.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":"9 8","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173556","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}
引用次数: 0
期刊
Ukrainian Journal of Physics
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1