International Journal of Nanomedicine
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2023
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IF 8
Ying Yang,Zhonggen Dong,Min Li,Lihong Liu,Hang Luo,Pu Wang,Dou Zhang,Xinghua Yang,Kechao Zhou,Shaorong Lei
Purpose Wound healing, especially of infected wounds, remains a clinical challenge in plastic surgery. This study aimed to manufacture a novel and multifunctional wound dressing by combining graphene oxide/copper nanocomposites (GO/Cu) with chitosan/hyaluronic acid, providing significant opportunities for the therapy of wound repair in wounds with a high risk of bacterial infection.Methods In this study, GO/Cu-decorated chitosan/hyaluronic acid dressings (C/H/GO/Cu) were prepared using sodium trimetaphosphate (STMP) crosslinking and the vacuum freeze-drying method, and chitosan/hyaluronic acid dressings (C/H) and GO-incorporated chitosan/hyaluronic acid dressings (C/H/GO) served as controls. The surface characterization, in vitro degradation under various pH values, antimicrobial potential, cytocompatibility and in vivo therapeutic efficacy in a bacteria-infected full-thickness skin defect model were systematically evaluated.Results Our experimental results indicated that the acidic environment facilitated the release of copper (CuNPs and Cu2+) from the dressings, and prepared C/H/GO/Cu dressings exhibited significant in vitro antimicrobial activities against the two tested bacterial strains (ATCC35984 and ATCC25923). All three dressings showed satisfactory cytocompatibility with mouse fibroblasts (NIH/3T3-L1). Moreover, remarkably accelerated wound healing was found in the C/H/GO/Cu group, with controlled inflammatory infiltration and improved angiogenesis in granulation tissues. In addition, no pathological damage was noted in the tissue structures of the tested organs (heart, lung, liver and kidney) in any of the four groups.Conclusion Collectively, GO/Cu-incorporated chitosan/hyaluronic acid dressings suggested a synergistic antimicrobial efficacy and acceptable biocompatibility both in vitro and in vivo, as well as a significantly accelerated healing process of bacteria-infected wounds. Thus, the multifunctional C/H/GO/Cu composite is expected to be a potential alternative for wound dressings, especially for the management of intractable wounds caused by bacterial infection.
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Journal of Nanostructure in Chemistry
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2023
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IF 10.1
Yu Dexin,Zhang Feng,Yu Kai,Qu Fengyu
Cobalt-based Layered double hydroxides (Co-LDHs) through designing composite nanostructures and heterogenous junctions, has absorbed an increased concern for dual-function applications including electrochemical sensing and energy devices. Herein, the g-C 3 N 4 and GO are applied as two-dimensional (2D) scaffolds for one-pot synthesis of 2D α/β-Co(OH) 2 phase junction (α/β-Co(OH) 2 /g–C 3 N 4 /rGO, denoted as CCG) in dopamine sensing and oxygen evolution reaction (OER). The coexist of hetero-phase structure (α and β-Co(OH) 2 ) toward crystalline phase has been confirmed by various techniques. Dependent on hetero-phase structural and compositional characteristics of CCG, CCG has revealed excellent electrochemical performance: a ranking sensing response to dopamine with ppb-level sensitivity and wide detection range; and high electrocatalytic ability (38.02 mV dec −1 ) with more stable catalytic capacity toward oxygen evolution reaction (OER). The above considerable potentials for CCG ascribes to the synergistic effect of heterostructure, phase structure along with defect of α/β-Co(OH) 2 .
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2023
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IF 3.6
Dang Xu,Bangzheng Wei,Ruizhi Chen,Rui Zhou,Jian Yang,Pengqi Chen,Jigui Cheng
WC reinforced W Cu composites have excellent wear resistance and high-temperature strength , and can replace conventional W Cu composites in special applications. In this work, W Cu composites with WC@W core-shell structure are fabricated through a novel microwave-heating salt-bath carbonization (MSC) and infiltration method, using graphite as the carbon source. The MSC behavior of W particles and the influence of the graphite content on the microstructure and properties of the W Cu composites are investigated. The results show that WC is successfully coated on the surface of W particles by the MSC method. The addition of an appropriate amount of graphite to W powders can improve the high-temperature mechanical properties and wear resistance of the W Cu composites. Compared with conventional W Cu composites, the W Cu composites with 0.9 wt% graphite have higher thermal conductivity (245 W/(m·K)), higher hardness (293.8 HV), higher bending strength (1089.4 MPa), and higher compressive strength (410 MPa| 600 °C ). The addition of graphite also significantly improved the wear resistance of the W Cu composites. The average coefficient of friction (CoF) and wear rates (WR) of WCu9 composites are 0.51 and 5.37 × 10 −6 mm 3 N −1 m −1 , respectively. The WC reinforced W Cu composites prepared in this work provide an excellent approach to improve the wear resistance and high-temperature properties of guide plates in guide devices.
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Chemistry-An Asian Journal
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2022
·Vol. 18
·期 3
·e202201130
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IF 4.839
Yuhang Han,Yingyi Ma,Junming Zhang,Shun Yao,Kaizheng Xu
Graphical Enhancing the low-dielectric, water resistance and mechanical properties of PI film through integrating GO and a sandwich-type porous structure was achieved. Simultaneous improvement in dielectric, water resistance and mechanical properties of polyimide (PI) films is critical for their practical use, but difficult to achieve. Herein, a sandwich-type porous GO/PI film with excellent comprehensive properties was obtained through integrating a GO-containing complex, fluorine-containing porous structure and sandwich-type distribution of porous structure by a simple, low-cost and green breath figure method. With the addition of only a small amount of GO-containing complex, a low dielectric constant of 2.21, water absorption of 0.51%, increment in dielectric constant after moisture treatment of 1.60% and high tensile strength of 113.1 MPa, tensile modulus of 1.70 GPa, with 35.39%, 79.42%, 81.81% of reduction and 17.22%, 21.43% of increase compared to PI film were shown, respectively. Moreover, these properties could be adjusted through regulating the component and porous structure by changing the parameters of breath figure method. These outstanding properties make the film a promising candidate for high-performance low-dielectric materials.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Yuhang Shen,Li Zheng
Polyaniline-poly (methylene blue) nano-rod composite has been prepared by a chemical oxidative polymerization method. The PANI-PMB composite was characterized by scanning electron microscopy, spectrophotometry, Fourier transforms infrared spectrometry, and X-ray diffraction. The electrochemical performance of the PANI-PMB composite was studied by electrochemical impedance spectroscopy, cyclic voltammetry, and differential pulse voltammetry. The prepared nanocomposite was applied for the electrochemical sensing of ascorbic acid. The results show that the PANI-PMB modified carbon paste electrode (PANI-PMB/CPE) had better catalytic activity to the electrochemical oxidation of ascorbic acid compared with PANI/CPE, PMB/CPE and CPE, which was due to the fast electron transfer efficiency of the PANI-PMB composite. Under the optimized experimental conditions, the differential pulse voltammetric peak current was linear with the ascorbic acid concentration in the range from 4 to 110 μM with a detection limit of 1.3 μM. Furthermore, the proposed method has been applied for the determination of ascorbic acid content in vitamin C tablets.
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ACS Applied Materials & Interfaces
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2023
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IF 9.5
Yimeng Su,Xiumei Zhang,Yan Wei,Yu Gu,Huilun Xu,Ziming Liao,Liqin Zhao,Jingjing Du,Yinchun Hu,Xiaojie Lian,Weiyi Chen,Yi Deng,Di Huang
Chronic inflammation caused by invasive bacterial infections severely interferes with the normal healing process of skin regeneration. Hypoxia of the infection microenvironment (IME) seriously affects the antibacterial effect of photodynamic therapy in phototherapy. To address this serious issue, a nanocatalytic hydrogel with an enhanced phototherapy effect consisting of a hydrogel polyvinyl alcohol (PVA) scaffold, MXene/CuS bio-heterojunction, and polydopamine (PDA) for photothermal antibacterial effects and promoting skin regeneration is designed. The MXene/CuS bio-heterojunction has a benign photothermal effect. Singlet oxygen (1O2) and hydroxyl radicals (·OH) were generated under near-infrared light, which made the hydrogel system have good antioxidant and antibacterial properties. The addition of PDA further improves the biocompatibility and endows the nanocatalytic hydrogel with adhesion. Additionally, in vivo assays display that the nanocatalytic hydrogel has good skin regeneration ability, including ability to kill bacteria, and promotes capillary angiogenesis and collagen deposition. This work proposes an approach for nanocatalyzed hydrogels with an activated IME response to treat wound infections by enhancing the phototherapeutic effects.
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FUEL
·
2023
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IF 7.4
Licheng Liang,Linyan Bian,Yanping Fan,Shuyan Guan,Xianyun Liu,Qunying Sun,Baozhong Liu
The research and development of efficient catalysts is very important for the sustainable utilization of hydrogen energy. Herein, we designed the Ru/Ti 3 C 2−x N x catalysts using N -doped two-dimensional material MXene (Ti 3 C 2−x N x ) as support toward hydrogen generation from ammonia borane (AB) hydrolysis. Due to the confinement and anchoring effects of Ti 3 C 2−x N x , the as-prepared Ru/Ti 3 C 2−x N x catalysts show an ultrafine particle size of 1.55 nm and remarkable AB hydrolysis activity with high turnover frequency (TOF) value of 1334 min −1 and r B value of 297 × 10 3 mL·min −1 ·g Ru −1 at 298 K. XPS results show that the doped N atoms in Ti 3 C 2−x N x support provide electron-feeding effect for Ru in the reaction to form electron-rich Ru. The isotope experiments confirm that the dissociation of H 2 O is the rate-determining step (RDS) in AB hydrolysis reaction catalyzed by Ru/Ti 3 C 2−x N x . According to the density functional theory (DFT) calculations, the N atoms introduced into Ti 3 C 2−x N x decrease the dissociation energy of O–H bond in H 2 O molecules, accelerating the desorption of H* from Ti 3 C 2−x N x surface. This research provides a strategy to enhance synergistic interaction between support and metal through N -doping, so as to effectively improve the catalytic performance of heterogeneous catalysts.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
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IF 6.1
Tianfei Chu,Mengmeng Cheng,Shifeng Hou,Yanzhao Yang
Effective removal of excess manganese ions (Mn 2+ ) from water is urgently needed to maintain human health and ecological balance. To date, electrochemical deposition (ED) techniques have been widely used for their simplicity and flexibility, while the active surface area and reliability of electrodes are still major issues. Herein, modified graphite papers (MGP) fabricated by the anionic intercalation method were used as the working electrode to remove Mn 2+ from wastewater via the electrochemical deposition method. The results showed that the highest removal of Mn 2+ by MGP-E was achieved when the voltage was 1.0 V, the deposition time was 6 h, and the pH value of the wastewater was 3.0. Under the above parameters, the removal rate of Mn 2+ in simulated wastewater can reach over 99.73 %, while the removal rates in industrial wastewater and groundwater can reach 96.20 % and 99.27 %, respectively, which can meet the standard of water treatment. The related tests confirmed that the deposition process had excellent cycling stability and low energy consumption. This study may provide an economical, sustainable and efficient electrode material for Mn 2+ removal from industrial wastewater and groundwater via electrochemical deposition technology.
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JOURNAL OF POWER SOURCES
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2023
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IF 9.2
Qingting Liu,Yuqing Luo,Shoukun Yang,Yuyue Xiong,Rongxin Wang,Xudong Fu,Rong Zhang,Shengfei Hu,Xujin Bao,Chenxi Xu
The preparation of traditional graphene oxide (GO)-based proton exchange membrane (PEM) composites asks for multiple transfer steps due to the different solvent requirements of GO preparation and polymer synthesis . Moreover, GO is easy to agglomerate in polymer matrix , it is difficult to give full play to the excellent proton conductivity of single/few-layered nanosheets . Herein, a novel transfer-free in-situ method is developed to prepare poly(2,5-benzimidazole) (ABPBI)-grafted electrolytic graphene oxide (EGO) composites (ABPBI-EGO) for high-temperature (HT) PEM fuel cells applications . The process involves the in-situ electrochemical oxidation and exfoliation of graphite foil into single/few-layered EGO in Eaton's reagent and followed by in-situ synthesis of ABPBI-grafted-EGO composites in the same reagent. This strategy leads to a single or few-layered dispersion of EGO nanosheets in ABPBI matrix, thus significantly improving the physicochemical performance. By constructing fast proton-conducting channels through single/few-layered GO nanosheets , composite membranes without free phosphoric acid exhibit superior proton conductivities over the whole temperature range of 120–180 °C. ABPBI-0.5EGO composite membrane-based fuel cell achieves a power density of 349 mW/cm 2 at 180 °C, which is nearly 2.3 times higher than the original ABPBI membrane. Thus, this transfer-free in-situ strategy shows great promise for developing high-performance HT-PEMs.
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CARBON
·
2022
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IF 11.307
Sijin Dong,Yang Li,Mengdi Zhang,Juntao Wang,Fengchun Li,Shuang Wu,Pengcheng Dai,Tao Xing,Xin Gu,Mingbo Wu
Defect-enriched carbon nanomaterials possess high potassium storage capacity and rapid ion transport capability; nevertheless, their rate performance is restricted by the deteriorated electronic conductivity induced by over-broken sp 2 -C conjugated structure. Herein, intrinsic defect-enriched carbon nanosheet (DCS) with controllable defect density is reported for the high-efficiency anode of potassium-ion batteries (PIBs). The DCS constructed by internal sp 2 -C configuration and external sp 3 -C defects can ensure good electron transport ability and afford abundant active sites for K + storage. As PIBs anode, DCS-24 obtained by ball-milling for 24 h with optimized defect density delivers a high specific capacity of 270.9 mAh g −1 at 0.5 C, an excellent rate performance (189 mAh g −1 at 10 C), as well as long cycle durability (255.1 mAh g −1 over 3000 cycles at 1 C). Electrochemical results and density functional theory simulations indicate that the intrinsic defects of carbon materials improve the capacitive K + storage capacity, speed up the K + diffusion, and lower the K + adsorption energy .
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ADVANCED MATERIALS
·
2023
·Vol. 35
·期 16
·2210753
·
IF 29.4
Yong Qi,Liujun Song,Changtong Zhou,Shufen Zhang
Shape-memory photonic crystals (SMPCs) transform the nanoscale deformation of copolymers into structural color through an undifferentiated response to stimuli; however, activatable selective responses are extremely rare. Herein, activatable dual confined shape-memory effects (CSMEs) derived from the remodeling of the interchain hydrogen bonds (H-bonds) in cold-programmable SMPCs are revealed. The first level is the water-triggered reconstruction of interchain H-bonds, which can activate/lock the collapsed skeleton, showing shape recovery/retention in response to ethanol vapor. The second level is the pressure-induced reorganization of interchain H-bonds that results in the recovered skeleton being locked even when exposed to ethanol vapor or water, while the background porous structure can switch between collapse and recovery. Dual CSMEs result from the Laplace pressure difference and the binding effect of interchain H-bonds in the skeleton according to insights of swelling, in situ deformation tracking, multidimensional infrared spectra, and water wetting/evaporation simulations. The signal interference, source code extraction, and color enhancement of structurally colored patterns can be implemented using CSMEs. This work opens up a new method for fabricating activatable responsive structural color and contributes to the expansion of nanophotonic technology in water printing, erasable watermarks, signal amplifiers, and information coding.
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SYNTHETIC METALS
·
2023
·
IF 4.4
Hongru He,Pan Xu,Tiantian Shang,Shan Wang,Mengtian Jiang,Xigui Yue
A flexible and efficient reduced graphene oxide/Fe 7 Co 3 /polydimethylsiloxane (rGO/Fe 7 Co 3 /PDMS) composite electromagnetic wave (EMW) absorber was prepared by a fast and simple liquid reduction and subsequent liquid phase blend method. The introduction of rGO tunes the dielectric constant and dielectric loss of the composite absorber, and Fe 7 Co 3 imparts magnetic loss characteristics to the material. The rheological properties of PDMS enable rGO/Fe 7 Co 3 to be well dispersed within it, forming a homogeneous structure, which contributes to the synergistic effect of the components and improves the impedance matching conditions and attenuation capability of the composite absorber. It is worth noting that the EMW absorption properties of the composites can be effectively adjusted by changing the amount of rGO/Fe 7 Co 3 added to the PDMS. When the amount of rGO/Fe 7 Co 3 is 8.00 wt%, rGO/Fe 7 Co 3 /PDMS-8 shows superior EMW absorption property. The minimum reflection loss (RL min ) of − 52.58 dB at 1.80 mm, and the widest effective absorption bandwidth (EAB, RL≤−10 dB) can reach 6.40 GHz (11.40–18.00 GHz) at only 1.60 mm. Furthermore, the twist test shows that the RL min and widest EAB of rGO/Fe 7 Co 3 /PDMS-8 remained at 92.64 % and 97.50 % of its initial values after 1500 twists, respectively, demonstrating its excellent flexibility. These results indicate that such rGO/Fe 7 Co 3 /PDMS-8 composite is very promising as a next generation flexible and efficient EMW absorbing material.
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