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Synthesis and characterizations of Mn doped alloyed ZnxCd1-xS nanocrystals Mn掺杂合金ZnxCd1-xS纳米晶的合成与表征

Advanced Materials Proceedings

Pub Date : 2021-12-09 DOI: 10.5185/amp.2017/711/

M. ., A. ., Manoj Sharma .

引用次数: 0

Investigation of deep electronic levels in n‐type and p‐type 3C‐SiC using photoluminescence 利用光致发光技术研究n型和p型3C - SiC的深层电子能级

Advanced Materials Proceedings

Pub Date : 2021-12-09 DOI: 10.5185/amp.2017/415/

Martin Wilhelm ., Mikael Syväjärvi ., Peter J. Wellmann .

引用次数: 0

Synthesis and structural re-investigation of Fe2TeO6 using synchrotron x-rays 同步辐射x射线合成Fe2TeO6及其结构再研究

Advanced Materials Proceedings

Pub Date : 2021-12-09 DOI: 10.5185/amp.2017/813/

H. ., A. ., Manavendra N. Singh ., Anil K. Sinha .

引用次数: 0

Mixed-mode delamination in laminate plate with crack 含裂纹层压板的混合模式分层

Advanced Materials Proceedings

Pub Date : 2021-12-08 DOI: 10.5185/amp.2018/1894

E. Kormaníková, K. Kotrasová

This paper deals with numerical modelling of laminate composite plate delamination that consists of unidirectional fiber reinforced layers. The delamination may be a fundamental problem in design of composite structures. The first-order shear laminate plate theory and fracture and contact mechanics were adopted for the methodology. The sublaminate modelling and delamination modelling are described by the help of finite element analysis. The displacements, reaction forces in springs and energy release rate along the lamination front are computed in modelling of interface. The numerical results are presented for problems with delamination of the mixed mode by using of 2D finite element analysis in the commercial ANSYS software. Copyright © 2018 VBRI Press.

引用次数: 0

Cu-ZnO nanoparticles for photocatalytic degradation of methyl orange Cu-ZnO纳米粒子光催化降解甲基橙

Advanced Materials Proceedings

Pub Date : 2021-12-08 DOI: 10.5185/amp.2018/7016

Raviraj M. Kulkarni, Ramesh S. Malladi, Manjunath S. Hanagadakar

Photocatalytic degradation of textile dye derivative Methyl Orange (M.O) has been studied in aqueous medium using 2% copper doped zinc oxide (2% Cu-ZnO) nanoparticles under UV irradiation. Simple inexpensive chemical precipitation method was used for synthesis of pure and copper doped zinc oxide nanoparticles. The prepared nanoparticles pure and copper doped zinc oxide was characterized by X-ray Diffraction Technique (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray analysis. The prepared nanoparticles were hexagonal wurzite structure. Photocatalytic efficiency of 2% Cu-ZnO were evaluated by studying mineralization of methyl orange (M.O.) as a model compound. The M.O. kinetics degradation was investigated under different parameters such as pH of the medium, catalyst dosage, M.O concentration, intensity of light etc. In addition reusability aspects of nanoparticles where also studied, which reveals that reused nanoparticles exhibited same results as that of virgin particles. Copyright © 2018 VBRI Press.

采用2%铜掺杂氧化锌(2% Cu-ZnO)纳米颗粒在紫外光照射下，在水介质中光催化降解纺织染料衍生物甲基橙(M.O)。采用简单廉价的化学沉淀法合成了纯氧化锌纳米粒子和铜掺杂氧化锌纳米粒子。采用x射线衍射技术(XRD)、扫描电镜(SEM)和能量色散x射线分析对制备的纯氧化锌纳米粒子和铜掺杂氧化锌纳米粒子进行了表征。制备的纳米颗粒为六方纤锌矿结构。以甲基橙(M.O.)为模型化合物，研究了2% Cu-ZnO的光催化效率。考察了不同介质pH、催化剂用量、M.O浓度、光照强度等条件下M.O降解动力学。此外，纳米颗粒的可重用性方面也进行了研究，这表明，重复使用的纳米颗粒表现出相同的结果与原始颗粒。版权所有©2018 VBRI出版社。

引用次数: 1

Impact of particle sizes on the microwave absorption properties of nano-sized Carbon black/epoxy composites 粒径对纳米炭黑/环氧复合材料微波吸收性能的影响

Advanced Materials Proceedings

Pub Date : 2021-12-08 DOI: 10.5185/amp.2018/7008

Sandeep Kumar Singh, A. Kumar Yadav, R. Pal, M. Akhtar, Kamal K. Kar

The nano-sized carbon black (NCB) with particle sizes of 15, 25, 55 and 65 nm are added in epoxy matrix in order to investigate the impact of particle sizes on the microwave absorption properties of the nano composites. The NCB powders were characterized by X-ray diffraction and Scanning electron microscopy (SEM) for identification of impurity phases. The complex permittivity spectra were recorded for the composites in the frequency range of 8.2-12.4 GHz. The results revealed that the particle sizes had substantial impact on the electromagnetic properties. On decreasing the particle size, the complex permittivity increases first up to certain extent then decreases. Interestingly, the particle size dependent tangent loss of NCB/epoxy composites shows that 25 nm size is most suited for high loss characteristics, whereas, losses decreases with size < 25 nm, which is attributed to high surface area of the particles. In addition, NCB/epoxy composite with 25 nm particle size illustrated substantial EM absorption efficiency at a frequency of 9.5 GHz, with RL reaching −13.2 dB and reflection loss below −10 dB up to 2.5 GHz with thickness of 2.0 mm. The effect of particle sizes on the electromagnetic properties was also discussed. Copyright © 2018 VBRI Press.

将粒径分别为15、25、55和65 nm的纳米炭黑(NCB)添加到环氧基中，研究了粒径对纳米复合材料微波吸收性能的影响。采用x射线衍射和扫描电子显微镜(SEM)对NCB粉末进行了表征。记录了复合材料在8.2 ~ 12.4 GHz频率范围内的复介电常数谱。结果表明，颗粒尺寸对电磁性能有较大影响。随着粒径的减小，复合介电常数先增大到一定程度后减小。有趣的是，NCB/环氧复合材料的切线损失与粒径的关系表明，25 nm尺寸最适合高损耗特性，而粒径< 25 nm时，损耗减小，这归因于颗粒的高表面积。此外，粒径为25 nm的NCB/环氧树脂复合材料在9.5 GHz频率下具有良好的电磁吸收效率，在2.5 GHz厚度为2.0 mm时，RL达到- 13.2 dB，反射损耗低于- 10 dB。讨论了颗粒尺寸对电磁性能的影响。版权所有©2018 VBRI出版社。

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引用次数: 2

Synthesis and characterization study of dual phase mixed zinc cobalt ferrite nanoparticles prepared via chemical co-precipitation method 化学共沉淀法制备双相混合锌钴铁氧体纳米颗粒的合成及表征研究

Advanced Materials Proceedings

Pub Date : 2021-12-08 DOI: 10.5185/amp2018/6997

Rohit R. Powar, Ashok B. Gadkari, Pravina B. Piste, Dnyandevo N. Zambare

Nanoparticles of Zinc substituted Cobalt ferrite powders having general formula ZnxCo1-xFe2O4 (x = 0, 0.25, 0.5, 0.75, 1.0) have been produced by using analytical grade nitrates and hexadecyltrimethylammonium bromide (CTAB) as structure directing reagent via Chemical co-precipitation method. The structure and morphology of prepared polycrystalline ferrite nanoparticles were investigated by X-ray diffraction (XRD), Fourier Transform Infrared Radiation (FTIR) and Scanning electron microscopy (SEM) respectively. Thermogravimetric differential analysis (TG/DTA) technique gives information about ferrite phase formation occurs beyond 450 oC. The XRD analysis confirms the establishment of the cubic spinel structure with the presence of minor secondary phase of α-Fe2O3 (hematite) at a calcination temperature of 650 oC. The polycrystalline mixed zinc cobalt ferrite nanoparticles showed a dual phase and crystallite size lies in the range 6-11 nm. FE-SEM microstructure shows the nearly spherical polycrystalline nanoparticles with a particle size in between 0.11-0.20 μm. The FT-IR spectra display two significant strong absorption bands nearby in the range of 400 cm and 600 cm on the tetrahedral and octahedral sites respectively. Copyright © 2018 VBRI Press.

采用化学共沉淀法，以分析级硝酸盐和十六烷基三甲基溴化铵(CTAB)为结构导向剂，制备了通式为ZnxCo1-xFe2O4 (x = 0、0.25、0.5、0.75、1.0)的锌取代钴铁氧体纳米颗粒。采用x射线衍射(XRD)、傅里叶变换红外辐射(FTIR)和扫描电镜(SEM)对制备的多晶铁氧体纳米颗粒的结构和形貌进行了研究。热重差析(TG/DTA)技术提供了450℃以上铁氧体相形成的信息。XRD分析证实，在650℃的煅烧温度下，形成了立方尖晶石结构，α-Fe2O3(赤铁矿)次级相少量存在。多晶混合锌钴铁氧体纳米颗粒呈双相结构，晶粒尺寸在6 ~ 11 nm之间。FE-SEM显微结构显示为近球形多晶纳米颗粒，粒径在0.11 ~ 0.20 μm之间。FT-IR光谱分别在四面体和八面体的400 cm和600 cm附近有两个明显的强吸收带。版权所有©2018 VBRI出版社。

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引用次数: 4

Ag nanoparticles induced modification in microhardness of polyvinyl alcohol 银纳米颗粒诱导聚乙烯醇显微硬度的改性

Advanced Materials Proceedings

Pub Date : 2021-12-08 DOI: 10.5185/amp.2018/6777

I. Saini, Annu Sharma, Naveneet Chandak, S. Aggarwal, Pawan K. Sharma

Silver (Ag) nanoparticles play a significant role in nanomaterials science and technology due to many peculiarities. One of the main characteristic of Ag nanoparticles is the occurrence of surface plasmon resonance (SPR) due to the collective oscillation of free electrons in visible region. Due to this distinctive feature Ag nanoparticles have numerous applications such as in catalysis, surface enhanced Raman spectroscopy, photonics, solar cells etc. In the present work, no additional stabilizing agent has been used. The characteristic SPR peak appears at around 405 nm in UV-Visible absorption spectra of PVA-Ag nanocomposite films, thereby confirming the nanocomposite formation. The synthesized nanocomposite films were structurally characterized using fourier transform infrared (FTIR) and Raman spectroscopy. FTIR spectra of PVA-Ag nanocomposite film indicates that PVA matrix is modified by Ag nanoparticles which is in agreement with the results obtained using Raman spectroscopy. TEM as well as FE-SEM micrographs reveal that Ag nanoparticles are mostly spherical in shape. The knoop microhardness number of the nanocomposites was found to increase from 2.4 Kgf/mm for PVA to 12.1 kgf/mm for PVA-Ag nanocomposite film loaded with 0.062 wt% Ag nanoparticles. Copyright © 2018 VBRI Press.

银纳米粒子以其独特的特性在纳米材料科学和技术中占有重要的地位。银纳米粒子的主要特性之一是由于自由电子在可见光区集体振荡而产生表面等离子体共振(SPR)。由于这一独特的特性，银纳米颗粒在催化、表面增强拉曼光谱、光子学、太阳能电池等方面有许多应用。在本工作中，没有使用额外的稳定剂。PVA-Ag纳米复合膜的紫外-可见吸收光谱在405 nm左右出现特征SPR峰，从而证实了纳米复合材料的形成。利用傅里叶红外(FTIR)和拉曼光谱对合成的纳米复合膜进行了结构表征。PVA-Ag纳米复合膜的FTIR光谱表明，纳米Ag修饰了PVA基体，这与拉曼光谱结果一致。TEM和FE-SEM显微形貌显示，银纳米颗粒呈球形。纳米复合材料的knoop显微硬度从PVA的2.4 Kgf/mm增加到0.062 wt% Ag纳米复合膜的12.1 Kgf/mm。版权所有©2018 VBRI出版社。

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引用次数: 1

A review of recent advances biomedical implants and their application 生物医学植入物及其应用的最新进展

Advanced Materials Proceedings

Pub Date : 2021-12-08 DOI: 10.5185/amp.2018/1428

K. Prem Ananth, Jinxing Sun, Jiaming Bai

引用次数: 0

Analysis of the effect of boron addition on steels for forged components 添加硼对锻件钢的影响分析

Advanced Materials Proceedings

Pub Date : 2021-12-08 DOI: 10.5185/amp.2018/6993

A. Di schino, Paolo Emilio Di Nunzio

Following the high cost of Mo and other alloying elements, many attempts are being carried out aimed to improve the hardenability of high thickness forged components without increasing their price. In this work the effect of B is examined on laboratory scale. In particular, two ingots have been cast in a pilot plant, with boron addiction. Boron as been added in a protected steel chemical composition, so to be effective in terms of hardenability. Materials were then hot rolled and cooled favoring the formation of a microstructure typical of that of forged components. Results on the material are compared to that of a standard steel in terms of hardenability. Copyright © 2018 VBRI Press.

引用次数: 0

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