材料物理与化学进展(英文)最新文献_第6页

Chemical Durability, Structure Properties and Bioactivity of Glasses 48P2O5-30CaO-(22−x)Na2O-xTiO2(With 0 < x ≤ 3; mol%) 48P2O5-30CaO-（22−x）Na2O-xTiO2玻璃（0＜x≤3；mol%）的化学耐久性、结构性能和生物活性

材料物理与化学进展(英文) Pub Date : 2020-12-24 DOI: 10.4236/ampc.2020.1012024

Y. Er-rouissi, Sara Aqdim, A. Bouari, F. Hmimid, Said Aqdim

{"title":"Chemical Durability, Structure Properties and Bioactivity of Glasses 48P2O5-30CaO-(22−x)Na2O-xTiO2(With 0 < x ≤ 3; mol%)","authors":"Y. Er-rouissi, Sara Aqdim, A. Bouari, F. Hmimid, Said Aqdim","doi":"10.4236/ampc.2020.1012024","DOIUrl":"https://doi.org/10.4236/ampc.2020.1012024","url":null,"abstract":"Phosphate glasses of composition 48P2O5-30CaO-(22−x)Na2O-xTiO2 (with 0 °C ± 20°C. The chemical durability of these glasses shows an improvement when the TiO2 content varies from 0 to 2 mol%. The measurements of differential thermal analysis and density, both, indicate the increase of the glass transition temperature and the density. The increase of Tg leads to an improvement of glass rigidity. X-ray diffraction analysis of the glasses annealed at 650°C for 48 h, indicates the appearance of a mixture of metaphosphate and pyrophosphate phases when the TiO2 content varies from 0 to 2 mol%, the last become majority when the TiO2 content rich 2 mol%. Nevertheless, when the TiO2 content exceeds 2 mol%, the analysis, both, by infrared spectroscopy and X-ray diffraction, reveals a radical change of structure with the formation of majorities isolated orthophosphate groups. SEM micrographs illustrated that the number of crystallites increased in the glass network when the TiO2 content increased at the expense of the Na2O content. An increase in the TiO2 content beyond 2 mol% led to the formation of a larger number of crystallites of different sizes, dominated by small crystallite sizes assigned to majority isolated short orthophosphate groups. This phenomenon led to a decrease in chemical durability and seems to be the main cause promoting the bioactivity of glasses. The results of the bioactivity, after a test in an SBF physiological solution within 15 days, shows, both, the formation of hydroxyapatite and tricalcium phosphate layers, in addition to the layer Ca2P2O7, known by its bioactivity, in some samples. The results obtained on the glasses studied make them potential candidates for an application in tissue engineering.","PeriodicalId":68199,"journal":{"name":"材料物理与化学进展(英文)","volume":"10 1","pages":"305-318"},"PeriodicalIF":0.0,"publicationDate":"2020-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45064212","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: 3

Formation of Diffusion Pairs as an Initial Stage in the Process of Decomposition of Alloys 扩散对的形成是合金分解过程的初始阶段

材料物理与化学进展(英文) Pub Date : 2020-12-24 DOI: 10.4236/ampc.2020.1012026

Y. Ustinovshikov

引用次数: 1

Simple Template-Free Synthesis of Bi2O3 Microflowers Composed of Nanorods 纳米棒组成的Bi2O3微花的简单无模板合成

材料物理与化学进展(英文) Pub Date : 2020-12-24 DOI: 10.4236/ampc.2020.1012025

M. Yada, T. Yamanoi, T. Watari

引用次数: 1

Polydopamine Coating on Titanium Affects Osteoblastic Differentiation to a Greater Degree than Does Surface Roughness 钛表面的聚多巴胺涂层对成骨细胞分化的影响大于对表面粗糙度的影响

材料物理与化学进展(英文) Pub Date : 2020-12-24 DOI: 10.4236/ampc.2020.1012027

S. Latifi, R. Shankar, H. Donahue

{"title":"Polydopamine Coating on Titanium Affects Osteoblastic Differentiation to a Greater Degree than Does Surface Roughness","authors":"S. Latifi, R. Shankar, H. Donahue","doi":"10.4236/ampc.2020.1012027","DOIUrl":"https://doi.org/10.4236/ampc.2020.1012027","url":null,"abstract":"Biointerface design can greatly influence cell behavior. Therefore, in this study we examined the effects of three surface characteristics, roughness, chemistry, and wettability, on osteoblastic cell differentiation. We examined osteoblastic differentiation on titanium (Ti) samples with four levels of roughness (average roughness: 148.6 ± 23.1, 42 ± 6.2, 14.3 ± 5.5, 7.2 ± 1.6 nm) with or without a nanolayer coating of polydopamine (PDA). In vitro osteogenic differentiation was evaluated by quantifying alkaline phosphatase (AP) activity of human fetal preosteoblastic (hFOB 1.19) cells. The change in surface chemistry of Ti samples as a result of PDA coating was assessed by XPS analysis and water contact angle measurement. Results demonstrated that PDA treated samples were more hydrophilic, compared to untreated samples, and this was substrate roughness independent. Moreover, with the exception of the substrate with an oriented texture of surface nanotopography (RTi-4), the presence of a PDA nanolayer increased AP activity independent of substrate roughness. Our results suggest that surface chemistry and wettability, induced by a PDA nanolayer coating, had a greater effect on osteoblastic differentiation than did surface roughness.","PeriodicalId":68199,"journal":{"name":"材料物理与化学进展(英文)","volume":"10 1","pages":"339-349"},"PeriodicalIF":0.0,"publicationDate":"2020-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47244936","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: 1

Preparation and Characterization of La2O3 Doped Ba0.3Sr0.7TiO3 Perovskite Ceramics of Varied Sintering Temperature and Doping 不同烧结温度和掺杂的La2O3掺杂Ba0.3Sr0.7TiO3钙钛矿陶瓷的制备与表征

材料物理与化学进展(英文) Pub Date : 2020-11-04 DOI: 10.4236/ampc.2020.1011019

Sanchita Dewanjee, R. Das, M. Miah

引用次数: 0

Ideal Failure Curve of Rolling Contact Bearings 滚动接触轴承的理想失效曲线

材料物理与化学进展(英文) Pub Date : 2020-11-04 DOI: 10.4236/ampc.2020.1011023

Y. Meged

引用次数: 0

One-Step Synthesis of Enhanced Band-Edge Emission ZnSe Nanowires Assisted by SnO2 SnO2辅助ZnSe纳米线的一步合成

材料物理与化学进展(英文) Pub Date : 2020-11-04 DOI: 10.4236/ampc.2020.1011020

L. Hou, Y. Guo, Lijuan Zhang

{"title":"One-Step Synthesis of Enhanced Band-Edge Emission ZnSe Nanowires Assisted by SnO2","authors":"L. Hou, Y. Guo, Lijuan Zhang","doi":"10.4236/ampc.2020.1011020","DOIUrl":"https://doi.org/10.4236/ampc.2020.1011020","url":null,"abstract":"Zinc selenide (ZnSe) is a direct band gap semiconductor material with a band gap of 2.7 eV at room temperature, and is a very promising blue light emitting material. However, the ZnSe nanomaterials grown by the usual Au-catalyzed chemical vapor deposition (CVD) method are prone to cause defects in the material, and its luminescence spectra generally have strong yellow light emission, which seriously affects its application in blue light devices. The paper proposes a simple method for preparing blue light-emitting ZnSe nanowires. Adding a small amount of SnO2 to the source material ZnSe powder, when using the CVD method to grow ZnSe nanomaterials, can obtain ZnSe nanomaterials with only band edge blue emission. SnO2 can not only act as a catalyst, promote the growth of ZnSe nanowires and nanoribbons, reduce the growth temperature of nanomaterials, but also avoid the occurrence of deep level defects in ZnSe nanomaterials, and obtain pure blue light emitting ZnSe nanowires. The emission peak of the nanowire grown by this method can be shifted from 460 to 500 nm. By precisely regulating the growth of the nanowire, it can make it emit light to cover the entire blue region, which can promote the application of inorganic semiconductor nanomaterials in the field of lighting and display.","PeriodicalId":68199,"journal":{"name":"材料物理与化学进展(英文)","volume":"10 1","pages":"263-269"},"PeriodicalIF":0.0,"publicationDate":"2020-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43490366","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

Characterization and Fabrication of Pb-Based Perovskites Solar Cells under Atmospheric Condition and Stability Enhancement 常压条件下铅基钙钛矿太阳能电池的表征、制备及稳定性增强

材料物理与化学进展(英文) Pub Date : 2020-11-04 DOI: 10.4236/ampc.2020.1011022

S. Ashrafi, M. K. Hossain, Md. Momanul Islam, M. Hossain, S. Fahad, M. Kamrujjaman, M. M. I. Masum, F. Ahmed, M. A. Hossain, Mohammad Obaidur Rahman

{"title":"Characterization and Fabrication of Pb-Based Perovskites Solar Cells under Atmospheric Condition and Stability Enhancement","authors":"S. Ashrafi, M. K. Hossain, Md. Momanul Islam, M. Hossain, S. Fahad, M. Kamrujjaman, M. M. I. Masum, F. Ahmed, M. A. Hossain, Mohammad Obaidur Rahman","doi":"10.4236/ampc.2020.1011022","DOIUrl":"https://doi.org/10.4236/ampc.2020.1011022","url":null,"abstract":"Optimization of Graphene concentration in optoelectronic properties has been studied which leads to progressive stability based on Graphene-CH3NH3PbI3 employing nanoparticles perovskites solar cells in this work. CH3NH3PbI3 wafer-based hetero-junction solar cells were developed under atmospheric conditions using Graphite as a hole transport layer (HTL) and TiO2 as an electron transport layer (ETL). In particular a considerable enhancement in power conversion efficiency (PCE < 0.01%) has been realized using optimum Graphene concentration (0.05 g/ml). The charge injection rate is radically faster for the particular Graphene composition than the pristine perovskites, which exposes ephemeral absorption in near to UV range. Graphene incorporation increased the average crystallite size and reduced the band gap 1.32 eV in the visible range. The expensive metals such as Ag and Au have been replaced by simple ITO, which tremendously reduces the fabrication cost of the PSCs. The fabricated devices were exposed to high conservation stability without cell encapsulation ambient condition for 150 days to show excellent stability.","PeriodicalId":68199,"journal":{"name":"材料物理与化学进展(英文)","volume":"10 1","pages":"282-296"},"PeriodicalIF":0.0,"publicationDate":"2020-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44282833","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: 6

Stability Behaviour of Monolayer Tetraether Lipids on the Amino-Silanised Silicon Wafer: Comparative Study between Langmuir-Blodgett Monolayers with Self-Assembled Monolayers 氨基硅硅片上单层四醚脂的稳定性行为:Langmuir-Blodgett单层与自组装单层的比较研究

材料物理与化学进展(英文) Pub Date : 2020-11-04 DOI: 10.4236/ampc.2020.1011021

S. Vidawati, U. Bakowsky, U. Rothe

{"title":"Stability Behaviour of Monolayer Tetraether Lipids on the Amino-Silanised Silicon Wafer: Comparative Study between Langmuir-Blodgett Monolayers with Self-Assembled Monolayers","authors":"S. Vidawati, U. Bakowsky, U. Rothe","doi":"10.4236/ampc.2020.1011021","DOIUrl":"https://doi.org/10.4236/ampc.2020.1011021","url":null,"abstract":"This study investigated the stability behaviour of molecular monolayer symmetric chemically modified tetraether lipids caldarchaeol-PO4 on the amino-silanised silicon wafer using Langmuir-Blodgett films, Self Assembling Monolayers (SAMs), ellipsometry, and atomic force microscopy (AFM). The monolayers of caldarchaeol-PO4 were stable on the solid surface amino-silanised silicon wafer. The organizations of molecular monolayers caldarchaeol-PO4 by Langmuir-Blodgett method and SAMs have been analyzed. The surface of pressure in Langmuir-Blodgett processing is carried out monolayers caldarchaeol-PO4 more flat island inhomogeneous. Another method of monolayers caldarchaeol-PO4 by SAMs is showed a large flat domain. Monolayers caldarchaeol-PO4 by Langmuir-Blodgett method seems to be stable and chemically resistant after washing with organic solvent and an additional treatment ultrasonification with various thickness lipids arround 2 nm to 6 nm. Conversely, monolayer caldarchaeol-PO4 by SAMs appears fewer than monolayers caldarchaeol-PO4 by Langmuir-Blodgett method, the thickness of various from 1 nm to 3 nm.","PeriodicalId":68199,"journal":{"name":"材料物理与化学进展(英文)","volume":"10 1","pages":"270-281"},"PeriodicalIF":0.0,"publicationDate":"2020-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43312762","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

Peierls Structural Transition in Q1D Organic Crystals of TTT2I3 for Different Values of Carrier Concentration 不同载流子浓度下TTT2I3 Q1D有机晶体的Peierls结构转变

材料物理与化学进展(英文) Pub Date : 2020-10-10 DOI: 10.4236/ampc.2020.1010018

S. Andronic, A. Casian

{"title":"Peierls Structural Transition in Q1D Organic Crystals of TTT2I3 for Different Values of Carrier Concentration","authors":"S. Andronic, A. Casian","doi":"10.4236/ampc.2020.1010018","DOIUrl":"https://doi.org/10.4236/ampc.2020.1010018","url":null,"abstract":"The Peierls structural transition in the TTT2I3 (tetrathiotetracene-iodide) crystal, for different values of carrier concentration is studied in 3D approximation. A crystal physical model is applied that considers two of the most important hole-phonon interactions. The first interaction describes the deformation potential and the second one is of polaron type. In the presented physical model, the interaction of carriers with the structural defects is taken into account. This is crucial for the explanation of the transition. The renormalized phonon spectrum is calculated in the random phase approximation for different temperatures applying the method of Green functions. The renormalized phonon frequencies for different temperatures are presented in two cases. In the first case the interaction between TTT chains is neglected. In the second one, this interaction is taken into account. Computer simulations for the 3D physical model of the TTT2I3 crystal are performed for different values of dimensionless Fermi momentum kF, that is determined by variation of carrier concentration. It is shown that the transition is of Peierls type and strongly depends on iodine concentration. Finally, the Peierls critical temperature was determined.","PeriodicalId":68199,"journal":{"name":"材料物理与化学进展(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41624767","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