Ti3C2-MXene-based composites provide multifunctional interfaces in diagnosis and treatment of tumors. Herein, we proposed a multifunctional nanoplatform based on Ti3C2-MXene–Au nanocomposites, which ...combines photothermal properties and peroxidase-like activity, accomplishing synergistic photothermal therapy (PTT) and enzyme dynamic therapy (EDT) accompanied by photoacoustic (PA) and thermal dual-mode imaging in vivo. Furthermore, PTT induces immunogenic cell death, and EDT promotes cell apoptosis, facilitating dendritic cell (DC) maturation and T cell infiltration into the tumor. On this basis, the antibody OX40 (αOX40) was utilized to further contribute immune therapy for reversing the immunosuppressive tumor microenvironment by activating CD4+ and CD8+ T cells. In summary, a triune of PTT/EDT/antitumor immune therapy is achieved by combining Ti3C2-MXene–Au nanocomposites and αOX40, which possesses several strong features of good biocompatibility, NIR-controlled targeting, significant cancer cell killing, and satisfactory biosafety in vitro and in vivo. Our work might highlight the promising application of MXene-based nanoplatforms for cancer therapy.
Abstract The synergistic effect of cavitation bubbles and sediment particles on material damage is a significant problem in fluid machinery. The dynamic behavior of a cavitation bubble near a ...spherical particle were simulated in this study using the Volume of Fluid (VOF) method. The effects of the particle-bubble size ratio δ on the bubble profiles, the collapse time, the micro-jets and the pressure at the particle surface have been investigated under the conditions of three values of stand-off distance γ . The results show that (1) the bubble collapse time rises as the particle-bubble size ratio δ increases; (2) the peak values of the maximum jet velocity and the maximum pressure exerting on the particle appear at γ = 1.0 and δ = 1.2, which are 165.3 m/s and 10.46 MPa, respectively; (3) the influence on the particle caused by the micro-jets cannot be ignored when the stand-off distance is less than 1.5.
The in situ growth of nano-array on material structure is a novel and high-efficient strategy to design catalysts, however, it still remains a challenge to fabricate unique nano-architecture ...electrocatalyst with prominent activity and superior durability for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Herein, a unique nano-architecture catalyst is successfully synthesized by using NiFe LDH nanosheets as framework to the in situ growth Mo-doped Ni2P ultrafine nanosheets (marked as Mo-Ni2P@NiFe LDH/NF). The unique 3D core-shell nano-architecture is favorable for enhancing electron transfer/mass diffusion, providing abundant active sites, prompting O2/H2 gas release, and creating the synergistic effect between Mo-Ni2P and NiFe LDH. Therefore, comparing with pure NiFe LDH/NF and Mo-Ni2P/NF electrodes, walnut-like Mo-Ni2P@NiFe LDH/NF catalyst exhibits significantly improved electrocatalytic activities and durability towards OER (269 mV @ 40 mA cm−2), HER (82 mV @ 10 mA cm−2), and overall water splitting (1.46 V @ 10 mA cm−2), respectively. Such electrocatalytic activity of Mo-Ni2P@NiFe LDH/NF is comparable with that of majority reported non-precious metal catalysts and even precious catalysts (IrO2 and Pt/C). This work presents a new perspective strategy to fabricate ingeniously bifunctional electrocatalysts with well-designed structure and superior performance for clean energy conversion technologies or storage devices.
Display omitted 3D walnut-like nano-architecture Mo-Ni2P@NiFe LDH/NF behaves as an efficient catalyst for electrochemical activities in 1.0 M KOH and 1.0 M PBS solution.
Non‐conjugated fluorescent polymers have attracted great attention due to their excellent biocompatibility and environmental friendliness. However, it remains a huge challenge to obtain a polymer ...with high fluorescence quantum yield (QY) and multicolor emission simultaneously. Herein, we reported three kinds of nonaromatic hyperbranched polyborates (P1–P3) with multicolor emission, surprisingly, P2 also exhibits an unanticipated high QY (54.1 %). The natural bond orbital (NBO) analysis and density functional theory (DFT) calculation results revealed that the synergistic effect of rigid BO3 planar and flexible carbon chain, as well as the through‐space dative bond in supramolecular aggregate, were the key factors contributing to the ultrahigh QY of P2. Moreover, the applications of P2 in Fe3+ ions detection and cell imaging were also investigated. This work provides a new perspective for designing non‐conjugated fluorescent polymers with both high QY and multicolor emission.
A nonaromatic hyperbranched polyborate was successfully synthesized. It exhibits multicolor emission and unanticipated high fluorescence quantum yield (54.1 %). This is due to the “rigid–flexible synergistic effect” of the rigid BO3 planar and the aliphatic flexible carbon chains as well as the through‐space dative bond in the compact aggregate structure.
Abstract
Li–CO
2
batteries are attractive electrical energy storage devices; however, they still suffer from unsatisfactory electrochemical performance, and the kinetics of CO
2
reduction and ...evolution reactions must be improved significantly. Herein, a composite of ruthenium–copper nanoparticles highly co‐dispersed on graphene (Ru–Cu–G) as efficient air cathodes for Li–CO
2
batteries is designed. The Li–CO
2
batteries with Ru–Cu–G cathodes exhibit ultra‐low overpotential and can be operated for 100 cycles with a fixed capacity of 1000 mAh g
−1
at 200 and 400 mA g
−1
. The synergistic effect between Ru and Cu not only regulates the growth of discharge products, but also promotes CO
2
reduction and evolution reactions by changing the electron cloud density of the surface between Ru and Cu. This work may provide new directions and strategies for developing highly efficient air cathodes for Li–CO
2
batteries, or even practical Li–air batteries.
Bayer red mud (RM) occupies a large amount of land, which excessive Na+ seriously damages groundwater resources. In this research, a RM based cementitious material (RMC) composed of RM and ordinary ...Portland cement (OPC) was developed. It is interesting to find that a binary reaction consisting of cement hydration and geopolymer reaction in RMC. The mechanical and Na+ consolidation rate of RMC were improved by the synergistic effect of binary reaction. The results indicated that the compressive strength of RMC is the highest and reaches 32.5R OPC when the mass ratio of CaO/(SiO2+Al2O3) is 1.37, and the Na+ leaching concentration is environmentally acceptable. The 7 days compressive strength of RM-based cementitious material No.2 (RMC2) can reach 93.80% of that of 28 days. As the predominant hydration products, cement hydration product (Ca5(SiO4)2(OH)2) and geopolymer (CaAl2Si2O8·2H2O and Na3Al3Si3O12·2H2O) were principally responsible for the strength development of RMC2 at 7 days. The optimal densification microstructure and SiO4 polymerization structure was presented in RMC2. The supreme Na+ consolidation rate was 99.23% in RMC2 due to the cooperation of physical fixation and Si(Al)O4 charge balance principle. This paper provides a fresh theoretical guidance for the utilization of RM and its Na+ in building materials.
Display omitted
•The binary reaction in red mud based cementitious material has been studied clearly.•Cement hydration and geopolymer reaction constitute a binary reaction.•The cooperation of cement hydration and geopolymer reaction has enhanced effect.•Hydration products based on binary reaction have highly dense polymer structure.•Na+ in red mud was utilized to form geopolymer to improve early strength of RMC.
Electromagnetic (EM) pollution affecting people’s normal lives and health has attracted considerable attention in the current society. In this work, a promising EM wave absorption and shielding ...material, MXene/Ni hybrid, composed of one-dimensional Ni nanochains and two-dimensional Ti3C2T x nanosheets (MXene), is successfully designed and developed. As expected, excellent EM wave absorption and shielding properties are obtained and controlled by only adjusting the MXene content in the hybrid. A minimum reflection loss of −49.9 dB is obtained only with a thickness of 1.75 mm at 11.9 GHz when the MXene content is 10 wt %. Upon further increasing the MXene content to 50 wt %, the optimal EM shielding effectiveness (SE) reaches 66.4 dB with an absorption effectiveness (SEA) of 59.9 dB. Mechanism analysis reveals that the excellent EM wave absorption and shielding performances of the hybrid are contributed to the synergistic effect of conductive MXene and magnetic Ni chains, by which, the dielectric properties and electromagnetic loss can be easily controlled to obtain appropriate impedance matching conditions and good EM wave dissipation ability. This work provides a simple but effective route to develop MXene-based EM wave absorption and shielding materials. A universal guideline for designing the absorbing and shielding materials for the future is also proposed.
Dispersion of graphene in water and its incorporation into waterborne resin have been rarely researched and hardly achieved owing to its hydrophobicity. Furthermore, it has largely been reported that ...graphene with impermeability contributed to the improved anticorrosion property. Here, we show that highly concentrated graphene aqueous solution up to 5 mg/mL can be obtained by synthesizing hydrophilic polypyrrole (PPy) nanocolloids as intercalators and ultrasonic vibration. On the basis of π–π interaction between PPy and graphene, stacked graphene sheets are exfoliated to the thickness of three to five layers without increasing defects. The corrosion performance of coatings without and with PPy and graphene is obtained by potential and impedance measurements, Tafel curves, and fitted pore resistance by immersing in a 3.5 wt % NaCl solution. It turns out that composite coating with 0.5 wt % graphene additive exhibits superior anticorrosive ability. The mechanism of intercalated graphene-based coating is interpreted as the synergistic protection of impermeable graphene sheets and self-healing PPy and proved by the identification of corrosion products and the scanning vibrating electrode technique.
