Fusion Of Particles Research Articles

Establishing the regularity of the emulsification process

The study is aimed at assessing the influence of the degree of quantitative content of vegetable oil in an aqueous-oily medium on the emulsification process. Safflower oil was chosen as the main ingredient of the oil phase. The degree of quantitative content of safflower oil varied from 20 to 80% in relation to water. The stability of emulsions depends on many factors, including the degree of ultrasonic action, the stability of water-oil emulsions is ensured only if a film forms on the interfacial surface that mechanically prevents the aggregation of particles of the dispersed phase. It is the stabilizing adsorption film, and not the low interfacial tension, that exclude the possibility of fusion of particles of dispersed phases. The production of water-oil emulsions based on various oils, including emulsions used in perfumery, food, petrochemical and other industries. The disadvantage of the above analogues is that the influence of quantitative parameters on the emulsification process has been established and they do not have a set of functional and technological properties necessary for the production of new types of food products. This paper presents the results of the influence of the quantitative parameters of the components on the formation of a water-oil emulsion based on safflower oil under ultrasound exposure. The process of formation of a water-oil emulsion largely depends on the quantitative parameters of the components and the parameters of ultrasonic exposure - the frequency and amplitude of ultrasound, as well as its power. Therefore, establishing the regularity of the emulsification process of a water-oil mixture based on safflower oil using ultrasonic exposure is an urgent task. In connection with the expansion of the scope of ultrasound in the production of various types of emulsions, studies are being conducted on the influence of quantitative parameters of components in the process of ultrasonic treatment on the physico-chemical and rheological parameters of the final product.

Research on improving the spreadability of viscous powder in additive manufacturing

The cohesive effect between particles is crucial in influencing the quality of the powder layer in additive manufacturing (AM), which will induce low reproducibility of the subsequent particle fusion process and degrade the performance of final products. In this work, the phenomenon and mechanism of interparticle cohesive effect were investigated through numerical simulations, based on which the methods that may reduce the negative effects of high cohesive interactions were proposed, assessed, and optimized. Results indicated that increasing the particle size could weaken the cohesion and effectively improve the packing fraction of the powder layer, but the surface roughness becomes worse due to the serious boundary effect of large particles under the blade. Besides, the spreading of viscous powders at low velocity and high deposition height could facilitate dense powder layers to some extent, while it contradicts the rapid fabrication and thin layer thickness required by AM. In contrast, the methods of increasing the friction resistance of substrate and optimizing the blade geometry could recover the powder layer quality under multiple indicators through limiting the scattered motion of particles and facilitating powder downward deposition, respectively. Consequently, the optimal approach was preferentially proposed to reduce the cohesive effect during spreading and obtain the powder layer with optimum packing fraction, uniformity, and surface roughness. On this basis, the operation window was further extended to high velocity and low deposition height, which can provide effective references for the practical AM process. • Cohesive effects on spreading of Ti6Al4V powders were numerically investigated. • Methods that reducing the cohesive effects on powder spreading were proposed. • Effectiveness/adaptability of these methods were assessed from parametric studies. • The underlying mechanisms were analyzed and corresponding solutions were provided.

Thermoelectric properties of Zn-Sb compound semiconductor

The article discusses the results obtained in the study of the thermoelectric properties of the semiconducting Zn-Sb polycrystalline structure obtained by powder technology. Studies show that thermal processing stages and temperature changes significantly affect its thermoelectric properties. At the initial stages of heat treatment, with an increase in temperature, the Seebeck coefficient (α), thermal conductivity (λ) and thermoelectric index (ZT) first decrease, then increase, and decrease again with an increase in temperature. From the fourth stage of heat treatment, all parameters increase with temperature. The research results were explained on the basis of the formation of intergranular boundary areas and its physical properties. The first stage of thermal treatment is the initial stage of ZnSb particle fusion, and the supplied thermal energy Q is not enough for ZnSb particle fusion. In the next stage of heat treatment, the atoms of the crystal lattice, which consists of a broken bond or defect between the pressed particles, are forced together or condensed. As the temperature increases, the phases of the crystal lattice atoms change and their reactivity increases. This leads to the formation of a ZnSb semiconductor with a polycrystalline structure. As the temperature increases, the localized traps with Ein energy level are ionized and electron-hole pairs are formed in the two adjoining boundary areas. Charges created in area A move to area V, which has a relatively low temperature, along the Ein energy levels. As a result, the total λ increases at the same time as the thermal conductivity of these two adjacent areas.

A New Hybrid Positioning Method by Fusion of BDS and 5G Signal Using the Particle Swarm Method

In recent years, with the vigorous construction of 5G networks, the high-density deployment, low delay, and high bandwidth of 5G network systems have enabled high-precision positioning services. By integrating the BeiDou Navigation Satellite System (BDS) and 5G systems, more reliable positioning services can be provided, and BDS–5G signal integrated positioning has become a new research hotspot. However, BDS–5G signal fusion positioning faces the problems of how to build an effective fusion positioning model between heterogeneous systems and the high complexity of multiobjective function positioning solutions. Therefore, this paper constructs a TOA/TDOA fusion positioning model of BDS–5G signals and introduces the multiobjective particle swarm optimization positioning solution method (MOPSO) to realize the reliable positioning of BDS and 5G signal system fusion (MOPSO-TOA/TDOA). The experimental results show that compared with the traditional BDS–5G signal fusion positioning algorithm based on a Kalman filter, the positioning accuracy of the BDS–5G signal joint solution system based on a multiobjective particle fusion algorithm is 24.8% higher than that of the Kalman filter in terms of positioning convergence time, 18.9% higher in terms of system positioning accuracy, and 50–80% higher than that of the BDS positioning system alone, and the reliable positioning ability in complex environments is effectively enhanced.

Effect of laser surface modification on the structure and mechanical properties of Al–8%Ca, Al–10%La, Al–10%Ce, and Al–6%Ni eutectic aluminum alloys

Additive manufacturing, which includes a set of technologies for manufacturing complex-shaped products with the required set of properties, is currently widely developed. Most additive technologies are associated with the manufacture of the product by melting and fusion of metal powder particles due to laser irradiation. Al–Ca, Al–Ce, Al–La, and Al–Ni eutectic aluminum alloys featuring excellent casting properties are supposedly promising for use in additive technologies. However, there is very little information on the effect of laser processing on such eutectic structures in the literature. In this regard, the paper investigated the effect of laser irradiation on the structure and mechanical properties of samples made of eutectic compositions, namely Al–8%Ca, Al–10%La, Al–10%Ce, and Al–6%Ni. This was achieved by continuous laser modification of their surfaces. The hardening level was evaluated by measuring the microhardness of the modified surface. The mechanisms of sample fracture under tensile testing were established. It was shown that the distribution of the second component in the structure of modified sample surfaces of all the four alloys becomes more uniform compared to the base metal structure. In the Al–8%Ca alloy, the greatest hardening effect was observed, which, however, contributes to embrittlement under tensile stress. However, the modified Al–8%Ca alloy is of interest because of its increased hardness and possibly increased wear resistance. On the contrary, laser modification of the Al–10%Ce, Al–10%La, and Al–6%Ni alloy sample surfaces provides a lower hardening effect, but increases their tensile strength with the formation of a ductile or mixed ductile-brittle fracture. The results obtained confirm the prospects of using the Al–Ca, Al–Ce, Al–La, and Al–Ni alloys in additive manufacturing.

Biobased Castor Oil-Based Polyurethane Foams Grafted with Octadecylsilane-Modified Diatomite for Use as Eco-Friendly and Low-Cost Sorbents for Crude Oil Clean-Up Applications.

Herein we report the synthesis and characterization of novel castor oil-based polyurethane (PU) foam functionalized with octadecyltrichlorosilane (C18)-modified diatomaceous earth (DE) particles, exhibiting superior hydrophobicity and oil adsorption, and poor water absorption, for use in effective clean-up of crude oil spillage in water bodies. High-performance and low-cost sorbents have a tremendous attraction in oil spill clean-up applications. Recent studies have focused on the use of castor oil as a significant polyol that can be used as a biodegradable and eco-friendly raw material for the synthesis of PU. However, biobased in-house synthesis of foam modified with C18-DE particles has not yet been reported. This study involves the synthesis of PU using castor oil, further modification of castor oil-based PU using C18 silane, characterization studies and elucidation of oil adsorption capacity. The FTIR analysis confirmed the fusion of C18 silane particles inside the PU skeleton by adding the new functional group, and the XRD study signified the inclusion of crystalline peaks in amorphous pristine PU foam owing to the silane cross-link structure. Thermogravimetric analysis indicated improvement in thermal stability and high residual content after chemical modification with alkyl chain moieties. The SEM and EDX analyses showed the surface's roughness and the incorporation of inorganic and organic elements into pristine PU foam. The contact angle analysis showed increased hydrophobicity of the modified PU foams treated with C18-DE particles. The oil absorption studies showed that the C18-DE-modified PU foam, in comparison with the unmodified one, exhibited a 2.91-fold increase in the oil adsorption capacity and a 3.44-fold decrease in the water absorbing nature. From these studies, it is understood that this novel foam can be considered as a potential candidate for cleaning up oil spillage on water bodies.

The effect of pulsed electron irradiation on the structure, phase composition, adhesion and corrosion properties of calcium phosphate coating on Mg0.8Ca alloy

The influence of pulsed electron irradiation (PEI) on the surface morphology, structure, phase composition, adhesion and corrosion properties of micro-arc coatings with β-tricalcium phosphate (β-TCP) particles on Mg0.8Ca alloy has been studied. When modifying the PEI coating with an energy density of 10 J/cm2, a melted layer is formed up to the substrate, as well as a denser transition layer between the coating and the substrate. At the same time, the surface layer of the coating is enriched with Ca and P due to the fusion of β-TCP particles and an increase in the adhesive strength of the coating is observed. With the help of potentiodynamic polarization curves, EIS test, and localized electrochemical analysis performed by SVET and SIET methods, a lower corrosion activity of this coating was established in comparison with the initial, unmodified state.

Effect of mixed magnetic field on physical properties of atmospheric suspended fine particles

In recent years, the fine particles suspended in the atmosphere, especially the particle size less than 10 μm, have caused very adverse effects on the climate environment and human health. However, the current research on the causes of air pollution mainly focuses on human activities and weather conditions. Considering the weak magnetism and chargeability of atmospheric fine particles, this study proposed a new view that space electromagnetic radiation may affect the physical properties of fine particles. We first analyzed the dynamic characteristics of magnetic micro-particle in the electromagnetic environment, and built a simulation model in the COMSOL simulation software. Finally, based on the theoretical analysis and simulation results, we built an experimental verification system to evaluate the effects of electromagnetic radiation on the physical properties of micro-particle, and carried out a 30-day control experiment. The experimental results showed that the physical properties such as particle size distribution, mass concentration, and morphology of suspended fine particles in the atmosphere under electromagnetic radiation are significantly different from those under non-electromagnetic radiation environment. It can be inferred that the aggregation, fusion, and deposition of suspended particles in the atmosphere are closely related to the complex electromagnetic environment in space.

In situ calibration of charged particle spectrometers on the OMEGA Laser Facility using 241Am and 226Ra sources

Charged particle spectrometry is a critical diagnostic to study inertial-confinement-fusion plasmas and high energy density plasmas. The OMEGA Laser Facility has two fixed magnetic charged particle spectrometers (CPSs) to measure MeV-ions. In situ calibration of these spectrometers was carried out using 241Am and 226Ra alpha emitters. The alpha emission spectrum from the sources was measured independently using surface-barrier detectors (SBDs). The energy dispersion and broadening of the CPS systems were determined by comparing the CPS measured alpha spectrum to that of the SBD. The calibration method significantly constrains the energy dispersion, which was previously obtained through the measurement of charged particle fusion products. Overall, a small shift of 100keV was observed between previous and the calibration done in this work.

Origin of nontopological soliton dark matter: solitosynthesis or phase transition

This work demonstrates that nontopological solitons with large global charges and masses, even above the Planck scale, can form in the early universe and dominate the dark matter abundance. In solitosynthesis, solitons prefer to grow as large as possible under equilibrium dynamics when an initial global charge asymmetry is present. Their abundance is set by when soliton formation via particle fusion freezes out, and their charges are set by the time it takes to accumulate free particles. This work improves the estimation of both quantities, and in particular shows that much larger-charged solitons form than previously thought. The results are estimated analytically and validated numerically by solving the coupled Boltzmann equations. Without solitosynthesis, phase transitions can still form solitons from particles left inside false-vacuum pockets and determine their present-day abundance and properties. Even with zero charge asymmetry, solitons formed in this way can have very large charges on account of statistical fluctuations in the numbers of (anti)particles inside each pocket.

Co-combustion of sewage sludge and Zhundong coal: Effects of combustion conditions on gaseous pollutant emission and ash properties

The combustion of sewage sludge (SS) generates large amounts of NOx and SOx, while that of alkali and alkaline earth metal-rich coals produces slagging-prone ash. To determine whether these problems can be mitigated through the co-combustion of SS and coal, we examined the effects of SS and Zhundong coal co-combustion in a horizontal tubular furnace on the emission of NOx and SOx, analyzing the micromorphology, composition, and pore structure of the produced ash. Sludge content was inversely correlated with SO2 emission but had little effect on NOx emission. A high sludge content promoted the fusion of ash particles, whose size was positively correlated with combustion temperature. Na/Ca-feldspar miscibility led to the fusion of ash particles, facilitating the production of magnesia-iron spinel and complex phosphates to alleviate slagging. The specific surface area of ash was negatively correlated with temperature and was the largest at a sludge content of 20 wt%. The fractal dimensions calculated to examine pore structure complexity and pore surface roughness revealed that the latter parameter was inversely correlated with temperature. A reaction temperature of 900 °C and sludge content of 20 wt% were optimal conditions for gaseous pollutant emissions and ash agglomeration behaviors during co-combustion. Thus, this study provides a theoretical basis for controlling the operation of coal/SS co-fired power plants in terms of pollutant emission, combustion efficiency, and ash slagging.

Inhibition of Gas-evolved electrolyte decomposition in cylindrical Li-ion battery cells of Ni-rich layered oxide with a dry coating process without post thermal annealing

Although Ni-rich layered oxide materials widely used as the cathode of lithium-ion batteries (LIBs) possess several interesting properties e.g., high energy density, they encounter severe capacity degradation and intrinsic poor thermal stability concerning the Ni-concentration. Herein, a core-shell-like architecture has been achieved by employing the cost-effective dry particle fusion method without an energy-consuming thermal annealing process with alumina (Al2O3) nanoparticles over LiNi0.8Mn0.1Co0.1O2 or NMC811 and resulting in an intact layer with an average shell thickness of 150–200 nm. Such NMC811@ Al2O3 core-shell exhibits excellent cycling stability compared with pristine NMC811. The chemical lithium diffusion coefficient, as calculated from a galvanostatic intermittent titration technique (GITT) infers that the introduction of Al2O3 coating slightly reduces the lithium diffusivity; however, it limits the active material dissolution, as perceived from post-ICP-OES analysis of the counter electrode. Besides, such modified systems exhibit a significant delay in onset potential related to surface layer decomposition and lattice oxygen release. Therefore, the present investigation concludes that the Al2O3 shell in the NMC811@ Al2O3 not only offers superior electrochemical performance but also exhibits good thermal stability. It could achieve thru a cost-effective and scalable dry-fusion method.

Influences of powder morphology on the densification and microstructure of a ZrO2‐based nanocrystalline glass–ceramic

AbstractMorphology is an important characteristic of raw powder utilized for ceramic sintering but the role of powder morphology is mostly overlooked. In this study, two types of ZrO2–SiO2 powder with different morphologies (fiber and particle) were synthesized by blow spinning and sol–gel method, respectively, followed by direct current electric field‐assisted hot pressing (FAHP) to obtain nanocrystalline glass–ceramics (NCGCs). Results showed that the two as‐synthesized powders had different pyrolysis behaviors. The two types of as‐synthesized powders were amorphous and tetragonal‐ZrO2 nanocrystallites first formed after calcination at 800°C. During FAHP, the particle powder can be densified at a lower temperature than that of the fiber powder, due to the facts that the particle powder showed higher specific surface area and higher densification driving force. The fiber powder was predominately densified by fiber fusion and plastic deformation, whereas the particle powder was densified via particle fusion. Both the two types of powder can be fully densified to obtain ZrO2–SiO2 NCGCs at 1230°C for 4 min. Tetragonal‐ZrO2 nanocrystallites in the NCGCs with particles as raw powder showed higher stability than those in the NCGCs with fibers as raw powder.

Ultrasonic Waveguides for Quench Detection in HTS Magnets

High-temperature superconductors (HTS) are expected to have a major impact on the development of future particle accelerators and fusion energy systems. One of key challenges associated with HTS is a slow propagation of the normal zone that complicates early detection of thermal runaway (quench) in an HTS magnet using voltage-based techniques. Furthermore, fusion systems require field ramping rates up to several T/s under strong time-varying ac magnetic fields imposed on the conductor which makes voltage-based quench detection difficult or impractical. We propose an alternative non-voltage quench detection solution based upon monitoring ultrasonic wave propagation in a solid fiber-like flexible waveguide. The latter can be co-wound with the superconducting cable and carry acoustic waves over long distances. Acoustic waveguides allow for measuring local variation of strain or temperature in a way similar to optical fibers. However, unlike fiber-optic sensors, mechanical waveguides are constructed of robust materials and eliminate the need for expensive and complex signal receivers and data processing equipment. We will present our early developments in cryogenic ultrasonic waveguide technology, and discuss preliminary experiments conducted towards validating it for future use in practical HTS magnets.

Investigation on mechanical and microstructural evolution of lithium-ion battery electrode during the calendering process

To increase battery capacity and improve electronic conductivity and electrochemical performance, lithium-ion battery electrodes are produced using a calendering process. This work aims to reveal the evolution of mechanics and microstructure during the calendering process, while a predictive model was derived to determine the thickness and porosity. Here, the discrete element method simulations and calendering experiments were adopted to analyze the microscale and macroscale responses. A predictive model was supplemented using the Heckel equation. Furthermore, the electrodes were manufactured under incremental line load. According to the electrode morphology, the deformation mechanism was summarized: Particle pulverization, secondary particle fusion, binder network compression and the current collector's surface deformation. The increase of the electronic conductivity is related, on the one hand, to the conductive path inside the electrode being improved and, on the other hand, to the tightening of the contact between the coating and the current collector • The discrete element method is taken to analyze the microscale and macroscale response. • A predictive model is derived for the determination of the thickness and porosity. • The deformation mechanism is summarized according to the electrode morphology.

Investigation of (d, 3n) reaction cross section using theoretical nuclear codes calculations on some nuclear materials

It is important to examine the effects of the nuclear reaction, which is used as a building material in nuclear reactors. Nuclear reactions occur as a result of the interaction between incident particles with the target nuclei. The charged particle-induced reactions have prime importance in understanding the reaction mechanism which can be applicable to understand the particles resulting from the reaction. It is useful to develop shielding the particle accelerators and fusion reactors. The present study contributes to providing the theoretical prediction of excitation functions for 112Cd (d, 3n)111In, 141Pr (d, 3n)140Nd, 167Er (d, 3n)166Tm, 197Au (d, 3n)196Hg and 209Bi (d, 3n)208Po reactions using theoretical model codes such as TALYS-1.95, EMPIRE-3.2.3, and ALICE-2014 within the incident deuteron energy range of threshold energy to 50 MeV. Also, newly developed (d, 3n) cross-section formula (Kavun, 2020) calculations have been performed for these reactions at 20 MeV of deuteron energy. Lastly, all calculated results have been compared with one another and with the previously published experimental data of the EXFOR database.

Supersaturated amorphous solid dispersions of celecoxib prepared in situ by microwave irradiation

This study investigated the ability of in situ amorphisation using microwave irradiation in order to prepare highly supersaturated ASDs, i.e. ASDs with drug loads higher than the saturation solubility in the polymer at ambient temperature. For this purpose, compacts containing the crystalline drug celecoxib (CCX) and polyvinylpyrrolidone (PVP), polyvinylpyrrolidone—vinyl acetate copolymer (PVP/VA), or polyvinyl acetate (PVAc), were prepared at drug loads between 30 and 90 % w/w. Sodium dihydrogen phosphate (NaH2PO4) monohydrate was included in all compacts, as a source of water, to facilitate the dielectric heating of the compacts upon dehydration during microwave irradiation. After processing, the samples were analysed towards their solid state using X-ray powder diffraction (XRPD) and modulated differential scanning calorimetry (mDSC). Complete amorphisation of CCX was achieved across all the investigated polymers and with a maximal drug load of 90, 80, and 50 % w/w in PVP, PVP/VA, and PVAc, respectively. These drug loads corresponded to a 2.3-, 2.4-, and 10.0-fold supersaturation in the investigated polymers at ambient temperature. However, dissolution experiments with the in situ prepared ASDs in fasted state simulated intestinal fluid (FaSSIF), showed a lower initial drug release (0–2 h) compared to equivalent physical mixtures of crystalline CCX and polymers or crystalline CCX alone. The lower drug release rate was explained by the fusion of individual drug and polymer particles during microwave irradiation and, subsequently, a lack of disintegration of the monolithic ASDs. Nevertheless, supersaturation of CCX in FaSSIF was achieved with the in situ amorphised ASDs with PVP and PVP/VA, albeit only after 3–24 h. Overall, the present study confirmed that it is feasible to prepare supersaturated ASDs in situ. However, in the current experimental setup, the monolithic nature of the resulting ASDs is considered a limiting factor in the practical applicability of this preparation method, due to limited disintegration and the associated negative effect on the drug release.

Physical Insight into the Conditions Required in the Solid-Phase Molecular Self-Assembly of SDS Revealed by Coarse-Grained Molecular Dynamics Simulation.

Molecular self-assembled materials have attracted considerable interest in recent years. As part of the efforts to overcome the shortcoming that the solution-based methods were hardly applicable in preparing bulk macroscopic molecular self-assemblies, Yan [ CCS Chem. 2020, 2, 98-106] developed a strategy of solid-phase molecular self-assembly (SPMSA) that allows scaling up the generation of massive supramolecular films. It is highly desired to understand the physical insight into the SPMSA at a molecular level. Here, in combination with the experimental study, we report molecular dynamics (MD) simulations on the SPMSA of the surfactant sodium dodecyl sulfate (SDS) using a coarse-grained method with the Martini force field model. The MD simulations clearly manifest that a small amount of water is required to endow the SDS molecules with sufficient mobility to self-assemble, and the smaller size of the preassembled SDS particles favors their further fusion into mesophases by reducing the total surface Gibbs free energy, while the smaller interparticle distance decreases the time for the particle fusion. The simulation results agree well with the conditions required in the experiment, confirming that SMPSA is a free-energy-favored process leading to bulk self-assembled materials.

Improvement of JASMINE code for ex-vessel molten core coolability in BWR

Evaluation of the molten core coolability in the wet cavity needs techniques to treat under-water melt behaviors including particle formation by break-up, horizontal spreading at the cavity bottom, and so on. The Japan Atomic Energy Agency extended the applicability of their fuel-coolant interaction analysis code JASMINE to simulate the relevant phenomena of molten core in a severe accident. It is assumed that three types of fuel debris with different coolable geometries would be produced in the wet cavity as particulate debris, agglomerated debris and cake debris. An agglomeration model that considers the fusion of hot particles on the cavity floor was implemented in the JASMINE code. Another significant improvement is the introduction of the melt spreading model based on the shallow water equation that takes crust development at the melt surface into account. These models have adjusting parameters, such as frequency of agglomeration occurrence between contacting particles as a function of melt enthalpy, mechanical strength of the surface crust governing the termination of melt spreading. For optimization of these parameters, we referred to data from the agglomeration experiment DEFOR-A and the under-water spreading experiment PULiMS conducted by Royal Institute of Technology (KTH) in Sweden. The JASMINE analyses reproduced most of the experimental results well with a common parameter set, suggesting that the primary phenomena are appropriately modelled.

Quenching-induced interfacial amorphous layer containing atomic Ag on Fe2O3 nanosphere for high-performance lithium-ion batteries and mechanism

The interfacial effect of nanomaterials plays a key role in their electrochemical performance when used in lithium-ion batteries (LIBs), but interfacial modification is a big challenging. Herein, a composite Fe2O3 nanoparticles with atomic Ag/amorphous layers were successfully prepared by co-deposition and subsequent quenching method. Compared to pristine Fe2O3, it maintains a higher capacity and longer cycle life in LIBs, with a capacity of 1150 mAh g−1 after 600 cycles at 0.5 Ag−1, and a long 1800 cycles at a current density of 5 Ag−1 after activation. Detailed experiments and Ex-situ TEM demonstrate that the fusion of surface particles occurred after calcination and quenching treatment, resulting in amorphous layers. The amorphous layer can act as a stabilizer during cycling, which protects the overall nanospheres structure from collapsing and thus leads to ultra-long cycling life. Our findings shed light on the surface modification of nanoscale materials and provides a manner to enhance the electrochemical performance of nanomaterials for LIBs.