Institutional Repository of Ningbo Institute of Material Technology & Engineering, CAS
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Unraveling the mechanism of ion and electron migration in composite solid-state electrolyte using conductive atomic force microscopy
No full textComposite solid electrolytes (CSEs) which formed a flexible interface with electrodes are considered as promising electrolytes candidates for all-solid-state batteries (ASSBs). However, the role of inorganic particles and migration of Li-ions still need to be investigated. Herein, LLZO-PEO composite electrolyte is prepared with different weight ratios (0, 50, 75 wt. %) of LLZO and in-situ conductive atomic force microscopy (c-AFM) is employed to observe the changes in electrolyte topography and mechanical properties at different temperatures. Furthermore, c-AFM provides novel insights into the inhomogeneous migration of ions and electrons within the electrolyte. At high temperatures, Li-ions migrate along the amorphous PEO interphase of 0 and 50 wt. % LLZO-PEO electrolytes. With the increase of LLZO content (75 wt. %), LLZO particles form a continuous ionic network and Li-ions migrate through the LLZO particles. At low temperatures, Li-ions can only migrate along the amorphous PEO. Also, the addition of LLZO inhibits the migration of electrons and improves the insulative properties of the composite electrolyte. The current work provides novel insights into the design and development of composite electrolytes for next-generation ASSBs
Peptide nucleic acid-assisted colorimetric detection of single-nucleotide polymorphisms based on the intrinsic peroxidase-like activity of hemin-carbon nanotube nanocomposites
No full textHere, taking the advantage of single-stranded (ss) DNA specific nuclease (S1) and peptide nucleic acid (PNA), we demonstrated a novel, rapid, and label-free colorimetric nanosensor for the sensitive and accurate detection of SNPs based on the intrinsic peroxidase-like activity of hemin-functionalized single-walled carbon nanotubes (hemin-SWCNTs). PNA, a man-made mimic of DNA with extraordinary stability toward enzymatic degradation, can effectively protect DNA in the fully matched DNA/PNA duplexes from nuclease digestion. While the DNA in DNA/PNA duplexes containing a mismatch can be cleaved into small fragments. This difference can be visually monitored from the specific color change of TMB/H2O2 system by employing the peroxidase activity of hemin-SWCNTs because of its different aggregation states responding to ssPNA or DNA/PNA duplex. Under optimized conditions, the SNPs in the human tumor suppressor gene TP53 have been successfully genotyped in a linear range of 50-1000 nM with a detection limit of 0.11 nM. Moreover, this platform can effectively discriminate a series of single-base mismatches. This assay avoids the assistance of sophisticated instruments and complicated modifications of probes or nanomaterials, and function well for both cell lysate samples and PCR amplicons from standard cell lines, implying its potential practical applications for bioanalysis and biosensors
Non-covalent assembly of a super-tough, highly stretchable and environmentally adaptable self-healing material inspired by nacre
No full textDeveloping autonomous ambient temperature self-healing materials with excellent mechanical strength is extremely challenging. Herein, inspired by nacre and mussels, we utilize the T-shaped chain extender with quadruple hydrogen bonds on the side chain to extend the polyurethane (PU) prepolymer. Then by virtue of the high-density non-covalent bond interaction at the interface between the dopamine-modified graphene oxide and the PU matrix, we obtained an ultrarobust strong self-healing material. Relying on the rapid and dynamic reconstruction of side chain quadruple hydrogen bonds, the composite with an inverse artificial nacre structure and interwoven network exhibits excellent stretchability (596.2%), high ultimate tensile strength (10.3 MPa), toughness (37.8 MJ m(-3)), and Young's modulus (31.5 MPa), as well as unexpected ambient temperature rapid self-healing ability (90%, 25 degrees C for 1 h). Interestingly, graphene arranged in parallel in PU can significantly enhance the impermeability and long-term corrosion resistance of the coating. This bionic strategy provides a potential pathway to develop ultrarobust self-healing materials used in marine harsh environment equipment, various flexible functional devices and even medical materials
Synergistic effect of carbon fiber and graphite on reducing thermal resistance of thermal interface materials
No full textThermal interface materials (TIM) have become a leading solution to achieve lower operating temperature in electronic devices. To improve thermal conductivity and to simultaneously reduce thermal resistance, this work investigates the thermal properties for interface materials with carbon fiber and graphite. When the ratio between carbon fiber to graphite is 1:1, the thermal resistance can be reduced to 1.8 x 10-4 K m2 W-1 at 30 psi, although the bulk thermal conductivity is lowered from 34 to 19 W m-1 K-1. The synergistic effect between carbon fiber and graphite is investigated. Surface roughness of TIMs was measured and two different types of thermal conductivity measurement were applied to demonstrate that graphite makes a contribution to bulk thermal conductivity where a CF played an important role for smoothing the surface, thereby lowering the thermal resistance. In real applications, the hybrid filler is shown to perform better in enhancing the heat conduction for electrical packaging
Proximity-Induced Novel Ferromagnetism Accompanied with Resolute Metallicity in NdNiO3 Heterostructure
No full textEmploying X-ray magnetic circular dichroism (XMCD), angle-resolved photoemission spectroscopy (ARPES), and momentum-resolved density fluctuation (MRDF) theory, the magnetic and electronic properties of ultrathin NdNiO3 (NNO) film in proximity to ferromagnetic (FM) La0.67Sr0.33MnO3 (LSMO) layer are investigated. The experimental data shows the direct magnetic coupling between the nickelate film and the manganite layer which causes an unusual ferromagnetic (FM) phase in NNO. Moreover, it is shown the metal-insulator transition in the NNO layer, identified by an abrupt suppression of ARPES spectral weight near the Fermi level (E-F), is absent. This observation suggests that the insulating AFM ground state is quenched in proximity to the FM layer. Combining the experimental data (XMCD and AREPS) with the momentum-resolved density fluctuation calculation (MRDF) reveals a direct link between the MIT and the magnetic orders in NNO systems. This work demonstrates that the proximity layer order can be broadly used to modify physical properties and enrich the phase diagram of RENiO3 (RE = rare-earth element)
Facile synthesis of biocompatible magnetic titania nanorods for T-1-magnetic resonance imaging and enhanced phototherapy of cancers
No full textCancer treatment has been recently energized by nanomaterials that simultaneously offer diagnostic and therapeutic effects. Among the imaging and treatment modalities in frontline research today, magnetic resonance imaging (MRI) and phototherapy have gained significant interest due to their noninvasiveness among other intriguing benefits. Herein, Fe(iii) was adsorbed on titanium dioxide to develop magnetic Fe-TiO2 nanocomposites (NCs) which leverage the Fe moiety in a double-edge-sword approach to: (i) achieve T-1-weighted MRI contrast enhancement, and (ii) improve the well-established photodynamic therapeutic efficacy of TiO2 nanoparticles. Interestingly, the proposed NCs exhibit classic T-1 MRI contrast agent properties (r(1) = 1.16 mM(-1) s(-1)) that are comparable to those of clinically available contrast agents. Moreover, the NCs induce negligible cytotoxicity in traditional methods and show remarkable support to the proliferation of intestine organoids, an advanced toxicity evaluation system based on three-dimensional organoids, which could benefit their potential safe application for in vivo cancer theranostics. Aided by the Fenton reaction contribution of the Fe component of the Fe-TiO2 NCs, considerable photo-killing of cancer cells is achieved upon UV irradiation at very low (2.5 mW cm(-2)) intensity in typical cancer PDT. It is therefore expected that this study will guide the engineering of other biocompatible magnetic titania-based nanosystems with multi-faceted properties for biomedical applications
Double-Layer Nitrogen-Rich Two-Dimensional Anionic Uranyl-Organic Framework for Cation Dye Capture and Catalytic Fixation of Carbon Dioxide
No full textA novel two-dimensional double-layer anionic uranyl-organic framework, U-TBPCA {[NH2(CH3)(2)][(UO2)(TBPCA)], where H(3)TBPCA = 4,4',4-s-triazine-1,3,5-triyltripamino-methylene-cyclohexane-carboxylate}, with abundant active sites and stability was obtained by assembling UO2(NO3)(2). 6H(2)O and a triazine tricarboxylate linker, TBPCA(3-). Due to the flexibility of the ligand and diverse coordination modes between carboxyl groups and uranyl ions, U-TBPCA exhibits an intriguing topological structure and steric configuration. This double-layer anionic uranyl-organic framework is highly porous and can be used for selective adsorption of cationic dyes. Due to the presence of high-density metal ions and basic -NH- groups, U-TBPCA acts as an effective heterogeneous catalyst for the cycloaddition reaction of carbon dioxide with epoxy compounds. Moreover, the various modes of coordination between the tricarboxylic ligand and uranyl ion were studied by density functional theory calculations, and several simplified models were established to probe the influence of hydrogen bonding between carbon dioxide and U-TBPCA on the ability of U-TBPCA to bind carbon dioxide. This work should aid in improving our understanding of the coordination behavior of uranyl ion as well as the development and utilization of new actinide materials
High-performance Li-air battery after limiting inter-electrode crosstalk
No full textLi-air battery (LAB), the energy-storage technology with highest theoretical energy density, is still seriously challenged by poor energy efficiency and limited durability though plenty of progresses have been made. In this work, we demonstrate that high performance LAB operated in N-2-O-2 (78:22) atmosphere could be achieved after limiting the inter-electrode crosstalk. The Li+-filtration membrane placed between electrodes could tailor the side reactions on lithium and suppress the anodic consumption of solvents & additives. With the adoption of lab-made blocking layer, the optimal cells stably operate for 1500 cycles with energy efficiencies as high as 90 similar to 95%, significantly better than other energy-storage systems. This approach presents the necessity of inhibiting interelectrode crosstalk in LAB to the community, which shed light on the practical utilization of LAB as secondary batteries in the future
