scholarly journals High Effective Preparation of Amorphous-Like Si Nanoparticles Using Spark Erosion Followed by Bead Milling

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 594
Author(s):  
Mingcai Zhao ◽  
Juan Zhang ◽  
Wei Wang ◽  
Qi Zhang
Keyword(s):  
Amorphous Phase ◽  
Silicon Nanoparticles ◽  
Milling Time ◽  
Amorphous Structure ◽  
Processing Route ◽  
Bead Milling ◽  
Spark Erosion ◽  
Si Nanoparticles ◽  
Crystal Grains ◽  
Time And Energy

This work aims to prepare the silicon nanoparticles with the nanocrystal-embedded amorphous structure through spark erosion followed by bead milling. Spark erosion breaks up monocrystal silicon ingots into micro/nanoparticles, refines the crystal grains, makes the crystals randomly disordered, and increases isotropic character. Bead milling further refines the crystal grains to a few nanometers and increases the amorphous portion in the structure, eventually forming an amorphous structure with the nanocrystals embedded. Spark erosion saves much time and energy for bead milling. The crystallite size and the amount of amorphous phase could be controlled through varying pulse durations of spark discharge and bead milling time. The final particles could contain the nanocrystals as small as 4 nm and the content of amorphous phase as high as 84% and could be considered as amorphous-like Si nanoparticles. This processing route for Si nanoparticles greatly reduced the production time and the energy consumption and, more importantly, is structure-controllable and scalable for mass production of the products with higher purity.

Study on Amorphization of Mechanical Alloyed Cu50Zr40Ag10 Alloy

2011 ◽  
Vol 306-307 ◽  
pp. 1379-1382
Author(s):  
Lin Yan Xia ◽  
Yan Wang
Keyword(s):  
Mechanical Alloying ◽  
Amorphous Phase ◽  
Milling Time ◽  
Nearest Neighbor ◽  
Mechanical Stability ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Short Range Ordering

The amorphization and crystallization of mechanical alloyed Cu50Zr40Ag10 alloy have been investigated using X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results demonstrate that a full amorphous phase of Cu50Zr40Ag10 can be obtained through mechanical alloying. The amorphous phase begins to show the initial mechanical crystallization when the milling time is 108 h and subsequently the main milling product is still amorphous structure with increasing milling time up to 208 h. Therefore, the amorphous alloy exhibits the excellent mechanical stability during mechanical alloying. The nearest-neighbor distance of atoms firstly increases then reduces with the increasing milling time, indicating that there is a closely correlation between the initial crystallization behavior and short range ordering.

Mechanochemical Synthesis and Characteristics of Pb(Mg1/3Nb2/3)O3

2010 ◽  
Vol 177 ◽  
pp. 29-31
Author(s):  
Hao Wu ◽  
Cheng Chen ◽  
Dan Yu Jiang ◽  
Tao Feng ◽  
Qiang Li
Keyword(s):  
Mechanochemical Synthesis ◽  
Milling Time ◽  
Perovskite Phase ◽  
Annealing Treatment ◽  
Ferroelectric Material ◽  
Nano Particles ◽  
Processing Route ◽  
Sem Images ◽  
Lower Temperature ◽  
Xrd Patterns

This paper presents a novel mechanochemical synthesis technique for making nano-structured Pb(Mg1/3Nb2/3)O3 (PMN) ferroelectric material without annealing treatment in a much shorter time and at much lower temperature than those reported in the literature, by using the starting precursors MgO, PbO, and Nb2O5. Specimens of various milling time (3-6h) are characterized from XRD patterns to track and analyze the synthesizing procedure of this mechanochemical processing route. The time used to make the desired PMN powders varies with different milling power. When the constituent oxides were mechanically activated at 1.8KW milling power for 6h, the perovskite phase PMN powder was obtained; while it was formed when milling at 3KW for only 3h. Typical SEM images of the as-received PMN powders show that the powders are aggregated of nano-particles of about 100nm in size.

scholarly journals Morphology engineering of silicon nanoparticles for better performance in Li-ion battery anodes

2020 ◽  
Vol 2 (11) ◽  
pp. 5335-5342 ◽  
Author(s):  
Samson Y. Lai ◽  
Jan Petter Mæhlen ◽  
Thomas J. Preston ◽  
Marte O. Skare ◽  
Marius U. Nagell ◽  
...  
Keyword(s):  
Silicon Nanoparticles ◽  
Li Ion Batteries ◽  
Li Ion Battery ◽  
Si Nanoparticles ◽  
Morphology Engineering ◽  
Li Ion

To demonstrate the influence of the origin of Si materials on their performance in Li-ion batteries, Si nanoparticles were synthesized via silane pyrolysis. We highlight the importance of morphology engineering for creating long-lasting materials for Li-ion batteries.

Encapsulating silicon nanoparticles into N-doped carbon film as a high-performance anode for lithium ion batteries

2018 ◽  
Vol 11 (04) ◽  
pp. 1850067 ◽  
Author(s):  
Zheng Xing ◽  
Chunlai Huang ◽  
Yichen Deng ◽  
Yulong Zhao ◽  
Zhicheng Ju
Keyword(s):  
Current Density ◽  
High Performance ◽  
Large Scale ◽  
Silicon Nanoparticles ◽  
Specific Capacity ◽  
Carbon Film ◽  
Lithium Ion ◽  
Fast Diffusion ◽  
Lithium Storage ◽  
Si Nanoparticles

A flexible strategy is to exploit encapsulating Si nanoparticles into N-doping carbon film (Si-NC) that can effectively localize the Si nanoparticles, thereby solving the problem of serious volume change during cycling as well as facilitating the fast diffusion of Li[Formula: see text], and thus achieving improved anode performance. A maximum capacity of 883.1[Formula: see text]mAh[Formula: see text]g[Formula: see text] at the current density of 100[Formula: see text]mA[Formula: see text]g[Formula: see text] after 50 charge and discharge processes is achieved for Si-NC. Even at a large current density of 2000[Formula: see text]mA[Formula: see text]g[Formula: see text], a specific capacity of 415[Formula: see text]mAh[Formula: see text]g[Formula: see text] is maintained. Moreover, the charge capacity can still almost recover the initial capacity as the current density is reverted to 100[Formula: see text]mA[Formula: see text]g[Formula: see text], indicating that Si-NC has a superior rate performance in lithium storage. This facile synthesis route provides a new perspective to produce Si/C composite at a low cost and large scale with good electrochemical performance.

scholarly journals Specific Features of Structure Transformation and Properties of Amorphous-Nanocrystalline Alloys

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 358 ◽  
Author(s):  
Alexandr Aronin ◽  
Galina Abrosimova
Keyword(s):  
Amorphous Phase ◽  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Structural Changes ◽  
Shear Bands ◽  
Component Composition ◽  
Amorphous Structure ◽  
Structure Evolution ◽  
Current State ◽  
Heterogeneous Phase

This work is devoted to a brief overview of the structure and properties of amorphous-nanocrystalline metallic alloys. It presents the current state of studies of the structure evolution of amorphous alloys and the formation of nanoglasses and nanocrystals in metallic glasses. Structural changes occurring during heating and deformation are considered. The transformation of a homogeneous amorphous phase into a heterogeneous phase, the dependence of the scale of inhomogeneities on the component composition, and the conditions of external influences are considered. The crystallization processes of the amorphous phase, such as the homogeneous and heterogeneous nucleation of crystals, are considered. Particular attention is paid to a volume mismatch compensation on the crystallization processes. The effect of changes in the amorphous structure on the forming crystalline structure is shown. The mechanical properties in the structure in and around shear bands are discussed. The possibility of controlling the structure of fully or partially crystallized samples is analyzed for creating new materials with the required physical properties.

Mechanisms of Visible Photoluminescence from Size-Controlled Silicon Nanoparticles

2002 ◽  
Vol 737 ◽  
Author(s):  
Toshiharu Makino ◽  
Nobuyasu Suzuki ◽  
Yuka Yamada ◽  
Takehito Yoshida ◽  
Ikurou Umezu ◽  
...  
Keyword(s):  
Silicon Nanoparticles ◽  
Localized States ◽  
Excitation Spectra ◽  
Excitation Process ◽  
Visible Photoluminescence ◽  
Peak Energy ◽  
Recombination Processes ◽  
Si Nanoparticles ◽  
Oxygen Gas ◽  
Size Controlled

ABSTRACTWe have observed visible photoluminescence (PL) spectra (peak energy: 3.1 eV) of size-controlled silicon (Si) nanoparticles annealed in oxygen gas. The PL peak energy did not depend on the temperature, and the PL lifetime was relatively fast (on the order of nanoseconds). It was inferred that the visible PL was attributed to localized states in the oxidized surfaces of size-controlled Si nanoparticles. We also observed the PL excitation spectra and studied the excitation process. In order to elucidate mechanisms of the visible PL, excitation and recombination processes are discussed.

Silicon nanoparticles embedded in a porous carbon matrix as a high-performance anode for lithium-ion batteries

2016 ◽  
Vol 4 (29) ◽  
pp. 11381-11387 ◽  
Author(s):  
Lili Wu ◽  
Juan Yang ◽  
Xiangyang Zhou ◽  
Manfang Zhang ◽  
Yongpeng Ren ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Porous Carbon ◽  
High Performance ◽  
Silicon Nanoparticles ◽  
Reduction Process ◽  
Lithium Ion ◽  
Carbon Matrix ◽  
Magnesiothermic Reduction ◽  
Carbonization Process ◽  
Si Nanoparticles

Si nanoparticles embedded in a carbon matrix have been prepared by a carbonization process followed by a magnesiothermic reduction process.

Polyacrylonitrile-based turbostratic graphite-like carbon wrapped silicon nanoparticles: a new-type anode material for lithium ion battery

RSC Advances ◽  
2016 ◽  
Vol 6 (16) ◽  
pp. 12737-12743 ◽  
Author(s):  
Xiaozhong Dong ◽  
Chunxiang Lu ◽  
Liyong Wang ◽  
Pucha Zhou ◽  
Denghua Li ◽  
...  
Keyword(s):  
Lithium Ion Battery ◽  
Anode Material ◽  
Silicon Nanoparticles ◽  
Lithium Ion ◽  
Lithium Intercalation ◽  
Si Nanoparticles ◽  
New Type

The carbonaceous matrix formed by PAN-based turbostratic graphite-like carbon could give full play to the lithium-intercalation ability of Si nanoparticles.

scholarly journals Iodine and Selenium Biofortification of Chervil Plants Treated with Silicon Nanoparticles

Plants ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2528
Author(s):  
Nadezhda Golubkina ◽  
Anastasia Moldovan ◽  
Mikhail Fedotov ◽  
Helene Kekina ◽  
Viktor Kharchenko ◽  
...  
Keyword(s):  
Silicon Nanoparticles ◽  
Phenolic Content ◽  
Growth Stimulation ◽  
Complex Interaction ◽  
Shoot Biomass ◽  
Sodium Selenate ◽  
Plant Growth And Development ◽  
Joint Application ◽  
Si Nanoparticles ◽  
Total Antioxidant

Production of functional food with high levels of selenium (Se) and iodine (I) obtained via plant biofortification shows significant difficulties due to the complex interaction between the two elements. Taking into account the known beneficial effect of silicon (Si) on plant growth and development, single and joint foliar biofortification of chervil plants with potassium iodide (150 mg L−1) and sodium selenate (10 mg L−1) was carried out in a pot experiment with and without Si nanoparticles foliar supplementation. Compared to control plants, nano-Si (14 mg L−1) increased shoot biomass in all treatments: by 4.8 times with Si; by 2.8 times with I + Si; by 5.6 times with Se + Si; by 4.0 times with I + Se + Si. The correspondent increases in root biomass were 4.5, 8.7, 13.3 and 10.0 times, respectively. The growth stimulation effect of Se, I and I + Se treatments resulted in a 2.7, 3.5 and 3.6 times increase for chervil shoots and 1.6, 3.1 and 8.6 times for roots, respectively. Nano-Si improved I biofortification levels by twice, while I and Se enhanced the plant content of each other. All treatments decreased nitrate levels, compared to control, and increased the photopigment accumulation. Improvement of total antioxidant activity and phenolic content was recorded only under the joint application of Se + I + Si. Foliar nano-Si treatment affected other element content in plants: decreased Na+ accumulation in single and joint supplementation with Se and I, restored Fe, Mn and Cr amount compared to the decreased levels recorded in separately Se and I fortified plants and promoted Al accumulation both with or without Se and I biofortification. The results of this research suggest high prospects of foliar nano-Si supply for enhancing both growth and joint I/Se biofortification of chervil.

scholarly journals Ab Initio-Based Structural and Thermodynamic Aspects of the Electrochemical Lithiation of Silicon Nanoparticles

Catalysts ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 8 ◽  
Author(s):  
Seung-Eun Lee ◽  
Hyung-Kyu Lim ◽  
Sangheon Lee
Keyword(s):  
Atomistic Simulation ◽  
Silicon Nanoparticles ◽  
Crystalline Silicon ◽  
Silicon Nanoparticle ◽  
Maximum Capacity ◽  
Electrochemical Lithiation ◽  
Si Nanoparticles ◽  
Negative Effect ◽  
Thermodynamic Mechanism ◽  
New Si

We reported the theoretical understandings of the detailed structural and thermodynamic mechanism of the actual lithiation process of silicon nanoparticle systems based on atomistic simulation approaches. We found that the rearrangement of the Si bonding network is the key mechanism of the lithiation process, and that it is less frequently broken by lithiation in the smaller sizes of Si nanoparticles. The decreased lithiation ability of the Si nanoparticles results in the lithiation potential being significantly lower than that of crystalline silicon phases, which impedes the full usage of the theoretical maximum capacity. Thus, nanosized Si materials could have a negative effect on performance if they become too fine-sized. These findings provide a detailed view of the electrochemical lithiation process of silicon nanoparticles (Si NPs) and engineering guidelines for designing new Si-based nanostructured materials.

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