A journey from bulk brass to nanobrass: A comprehensive study showing structural evolution of various Cu/Zn bimetallic nanophases from the vaporization of brass

Bhaskar, Srilakshmi P.; Jagirdar, Balaji R.

doi:10.1016/j.jallcom.2016.09.318

Cited by 23 publications

(16 citation statements)

References 66 publications

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“…50-1333 and 65-6567), respectively, and are distinctively shifted from the fcc metallic copper pattern (JCPDS no. 04-0836), as reported elsewhere for brass BNPs and shown in Figure . Moreover, by using MDI’s Jade software for a whole peak fit and lattice calculation and based on the main crystallographic plane (111) of the fcc structure, the lattice parameter, a , was found to be 3.6294 Å which is noticeably distorted compared to the value of metallic copper (3.615 Å).…”

Section: Resultssupporting

confidence: 65%

Nanobrass CuZn Nanoparticles as Foliar Spray Nonphytotoxic Fungicides

Antonoglou

Moustaka

Adamakis

et al. 2018

ACS Appl. Mater. Interfaces

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Inorganic nanoparticles (NPs) have been proposed as alternative fertilizers to suppress plant disease and increase crop yield. However, phytotoxicity of NPs remains a key factor for their massive employment in agricultural applications. In order to investigate new effective, nonphytotoxic, and inexpensive fungicides, in the present study CuZn bimetallic nanoparticles (BNPs) have been synthesized as antifungals, while assessment of photosystem II (PSII) efficiency by chlorophyll fluorescence imaging analysis is utilized as an effective and noninvasive phytotoxicity evaluation method. Thus, biocompatible coated, nonoxide contaminated CuZn BNPs of 20 nm crystallite size and 250 nm hydrodynamic diameter have been prepared by a microwave-assisted synthesis. BNPs' antifungal activity against Saccharomyces cerevisiae was found to be enhanced compared to monometallic Cu NPs. Reactive oxygen species (ROS) formation and photosystem II (PSII) functionality at low light (LL) and high light (HL) intensity were determined on tomato plants sprayed with 15 and 30 mg L of BNPs for the evaluation of their phytotoxicity. Tomato leaves sprayed with 15 mg L of BNPs displayed no significant difference in PSII functionality at LL, while exposure to 30 mg L of BNPs for up to 90 min resulted in a reduced plastoquinone (PQ) pool that gave rise to HO accumulation, initiating signaling networks and regulating acclimation responses. After 3 h of exposure to 30 mg L of BNPs, PSII functionality at LL was similar to control, indicating nonphytotoxic effects. Meanwhile, exposure of tomato leaves either enhanced (15 mg L) or did not have any significant effect (30 mg L) on PSII functionality at HL, attributed to the absence of semiconducting oxide phases and photochemical toxicity-reducing modifications. The use of chlorophyll fluorescence imaging analysis is recommended as a tool to monitor NPs behavior on plants.

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Section: Resultssupporting

confidence: 65%

Nanobrass CuZn Nanoparticles as Foliar Spray Nonphytotoxic Fungicides

Antonoglou

Moustaka

Adamakis

et al. 2018

ACS Appl. Mater. Interfaces

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“…In spite of detailed knowledge about the bulk phases of brass, little is known about brass NPs, and even though a lot of progress has been made in recent years, experimental synthesis and characterization of brass NPs remains a 1 arXiv:2103.14130v1 [cond-mat.mtrl-sci] 25 Mar 2021 formidable challenge. Hence, to date only a few studies have addressed the synthesis of brass NPs, [13][14][15][16][17] and also theoretical studies are still rare. [18][19][20] Although a variety of methods such as basinhopping Metropolis Monte Carlo [21][22][23] (BHMC), genetic algorithms 24,25 and minima hopping 26 are available to identify low-energy configurations of large metal NPs, the global optimization (GO) of these systems remains a challenging task, [27][28][29][30][31][32] because alloy NPs have many degrees of freedom such as size, shape, composition and distribution of the elemental species.…”

Section: Introductionmentioning

confidence: 99%

Properties of α-Brass Nanoparticles II: Structure and Composition

2021

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Nanoparticles have become increasingly interesting for a wide range of applications, because in principle it is possible to tailor their properties by controlling size, shape and composition. One of these applications is heterogeneous catalysis, and a fundamental understanding of the structural details of the nanoparticles is essential for any knowledge-based improvement of reactivity and selectivity. In this work we investigate the atomic structure of brass nanoparticles containing up to 5000 atoms as a typical example for a binary alloy consisting of Cu and Zn. As systems of this size are too large for electronic structure calculations, in our simulations we use a recently parametrized machine learning potential providing close to density functional theory accuracy. This potential is employed for a structural characterization as a function of chemical composition by various types of simulations like Monte Carlo in the Semi-Grand Canonical Ensemble and simulated annealing molecular dynamics. Our analysis reveals that the distribution of both elements in the nanoparticles is inhomogeneous, and zinc accumulates in the outermost layer, while the first subsurface layer shows an enrichment of copper. Only for high zinc concentrations alloying can be found in the interior of the nanoparticles, and regular patterns corresponding to crystalline bulk phases of α-brass can then be observed. The surfaces of the investigated clusters exhibit well-ordered single-crystal facets, which can give rise to grain boundaries inside the clusters. The melting temperature of the nanoparticles is found to decrease with increasing zinc-atom fraction, a trend which is well-known also for the bulk phase diagram of brass.

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“…图 8 两种金属纳米粒子共消化熟化制备合金纳米粒子的结构示意图 Figure 8 Schematic illustration for alloy nanostructures by codigestive ripening of two metal nanoparticles 纳米合金与结构规整的金属间化合物的制备相对简单, 其共消化熟化的结果受热力学控制. 通过金属与配体的配合物的扩散, 实现不同颗粒之间的金属原子交换 [30] , 这种方法制备的纳米合金如 Au-Pd [96,97] 、 Au-Ag [19,98] 、Cu-Mg [99] 、Cu-Pd [100] 、Cu-Zn [101] 和磁性 FePt 纳米粒子等 [102,103] , 金属间化合物包括 Au-Cu [104,105] 、 Au-Sn [106] 、AgIn 3 和 AuIn 2 [107] 等.…”

Section: 金属纳米粒子的合金化unclassified

“…杨云等 [18] 结合消化熟化方法和种子生长法合成了系列核壳型双金属纳米粒子(Ag@Pd、 Pd@Au、 Pd@Ag、 Au@Pd、Au@Ag、Pt@Au 和 Pt@Pd), 其中颗粒尺寸、壳层厚度和元素组成可以通过调节前驱物与种子比例控制; 如果延长消化熟化时间, 这些核壳型纳米粒子则转变为合金. 此外, Jagirdar 等 [101] 将核壳型 Cu@Zn 纳米粒子在对异丁基甲苯中加热回流时, 发现铜原子从内部逐渐扩散到表面聚集, 再进行配体消化后可以形成两种金属的异质结.…”

Section: 金属纳米粒子的合金化unclassified

Digestive Ripening at Nanoscale and Its Application in the Preparation of Monodisperse Nanomaterials

Li¹,

Gao²,

Zhang³

et al. 2019

Acta Chim. Sinica

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Recently, a digestive ripening process at nanoscale has been widely used to prepare monodisperse nanoparticles (NPs), especially for sub-10 nm small NPs, with significant advantages such as the very narrow size distribution of the obtained nanoparticles, the versatile applications for various nanoparticles and the simple operation process. However, no Chinese references are reported on digestive ripening process till now, which may limit the cognition and utility of digestive ripening method for some domestic scientists. Thus, this review starts from the discovery of the phenomenon and the proposal of mechanism for digestive ripening at nanoscale, to the analysis of influence factors including the precursor in the precipitation reaction, the digestive ripening reagent, heating treatment temperature and processing time, solvent media and so on. Then, theoretical hypothesis and the derived results are introduced based on the charged surface, the curvature effect, the interaction between NP surface and attached ligand layer, the diffusion effect and the competing reaction balance in the digestive ripening process. Subsequently, the important applications of digestive ripening method in the preparation of monodisperse nanomaterials of metal NPs, alloy NPs, quantum dots of metal oxide and metal chalcogenide, and other NPs are discussed, the obtained small metal or alloy NPs show a perfect sphere shape and a very narrow size distribution (relative standard deviation less than ±5%). Finally, the broad perspectives are proposed in the NP assembly for optical, electric and magnetic nanodevices, and the heterogeneous catalysis of monodisperse metal, alloy and semiconducotr NPs via the digestive ripening method.

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A journey from bulk brass to nanobrass: A comprehensive study showing structural evolution of various Cu/Zn bimetallic nanophases from the vaporization of brass

Cited by 23 publications

References 66 publications

Nanobrass CuZn Nanoparticles as Foliar Spray Nonphytotoxic Fungicides

Nanobrass CuZn Nanoparticles as Foliar Spray Nonphytotoxic Fungicides

Properties of α-Brass Nanoparticles II: Structure and Composition

Digestive Ripening at Nanoscale and Its Application in the Preparation of Monodisperse Nanomaterials

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