JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
·
IF 8.067
Xun Fan,Fengchao Wang,Qiang Gao,Yu Zhang,Fei Huang,Ronglin Xiao,Jianbin Qin,Han Zhang,Xuetao Shi,Guangcheng Zhang
Hierarchical layered structures, whether in a compact form like nacre or a porous manner like bone, are well known for their combined features of high stiffness, strength, and lightweight, inspiring many man-made materials and structures for high performance applications. The use of nacre/bone like hierarchical structures in polymer nanocomposites can achieve excellent mechanical and functional properties with high filler volume fractions after carefully aligning functional nanofillers, although the fabrication and processing remain a great challenge. In this work, a bio-inspired lightweight nano-cellular epoxy/graphene-Fe 3 O 4 nanocomposite with high nanofiller loading of 75 wt.% was successfully fabricated by combining features from both nacre and bone structures, via a simple compression molding process together with an eco-friendly supercritical CO 2 foaming process to achieve robust mechanical strength and excellent electromagnetic interference (EMI) shielding effectiveness (SE) simultaneously. Highly aligned graphene-Fe 3 O 4 nanoplatelets with well controlled nanoscale porous structures (52.6 nm) enabled both low density (1.26 g/cm 3 ) and high specific EMI SE >5200 dB/cm 2 /g, as well as preserved tensile strength of 67 MPa. This study provides a sustainable route to fabricate nature mimicked structures with high performance and high flexibility for a wide range of applications, from portable electronics to healthcare devices.
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高影响因子
FOOD CHEMISTRY
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2021
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IF 7.514
Xue Gao,Zhiying Ma,Minjun Sun,Xiuying Liu,Keli Zhong,Lijun Tang,Xuepeng Li,Jianrong Li
Based on the electrostatic interaction, we constructed a ratiometric fluorescence nanomixture of graphene quantum dots-gold nanoclusters (GQDs-AuNCs) for the quantitative detection of Cu 2+ and Cd 2+ . When Cu 2+ or Cd 2+ was added into the reaction system, the fluorescence of GSH-AuNCs at 565 nm can be quenched by Cu 2+ and enhanced by Cd 2+ while the intensity of N -GQDs at 403 nm stayed constant. Under the optimized conditions, the fluorescence intensity ratio (I 565 /I 403 ) of the GQDs-AuNCs system was proportional to the concentration of Cu 2+ and Cd 2+ in the range of 8×10 −8 mol/L-6×10 −6 mol/L and 1×10 −6 mol/L-4×10 −5 mol/L, respectively, with detection limits of 4.12×10 −9 mol/L and 9.43×10 −7 mol/L, respectively. In the presence of Cu 2+ and Cd 2+ , the paper-based vision sensor would produce visible fluorescent color changes, which can be used for rapid detection on site. The method has been successfully applied to the determination of Cu 2+ and Cd 2+ in scallops with satisfactory results.
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Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Yangjinghua Yu,Runjun Sun,Zhong Wang,Mu Yao,Guohe Wang
Graphene oxide (GO) composite materials as adsorbent have been widely researched in the adsorption various heavy metal contaminated water . In order to improve its structural stability and adsorption properties, self-support GO/Sodium Alginate (SA)/1, 2-Propanediamine (PDA) composite membrane was prepared by vacuum filtration. The performance of amino functional groups in composite membranes was observed using X-ray photoelectron spectrum (XPS). The X-ray diffraction (XRD) was used to characterize the interlayer spacing. The Pb 2+ adsorption properties of composite membranes were discussed by intermittent adsorption experiments. Intermittent adsorption experiments include the subject of the pH, contact time, adsorption film weight, concentration of metal ion and temperature change. The Pb 2+ adsorption on the composite membrane strongly depends on pH. After 20 min of adsorption, the membrane reached the adsorption equilibrium, and the adsorption rate was fast. The maximum adsorption capacity of the composite membrane to Pb 2+ was 189.25 mg g −1 . The adsorption process of the membrane was consistent with the chemisorption process and mono-layer adsorption process. The GO/SA/PDA membranes can be used to the adsorption of Pb 2+ , which might give contribution to environmental protection.
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高影响因子
Nanomaterials
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2021
·Vol. 11
·期 8
·2126
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IF 5.076
Yanjie Chen,Enzhu Hu,Hua Zhong,Jianping Wang,Ayush Subedi,Kunhong Hu,Xianguo Hu
Graphene has been widely used as a lubricating additive to reduce the energy consumption of engines and improve fuel economy because of its unique crystal structure. Herein, graphene (GR) and fluorinated graphene (F-GR) nanoparticles were prepared by ball milling and liquid-phase exfoliation. The SEM/EDS, HRTEM, XPS, Raman spectrometer, X-ray spectrometer, FTIR were used to investigate the morphologies, surface groups, and crystal structure of two kinds of graphene materials. The influence of loads on the tribological properties of two kinds of particles was investigated in Poly Alpha Olefin (PAO6) using a UMT-2 reciprocating tribometer. Results showed that the crystal structure of GR is better than F-GR. F-GR can improve the lubrication performance of PAO6. For PAO6 containing 1 wt% F-GR at 10 N, the average friction coefficient and average wear rate decreased by 12.3% and 87% relative to pure PAO6, respectively. However, the high load resulted in an inconspicuous anti-wear and anti-friction effect. The influence of F-GR on the tribological behavior of PAO6 was more substantial than that of GR. The friction and wear mechanisms attributed to F-GR quickly entered the interface between the friction pairs. Friction-induced F-GR nanosheets mainly took the tribo-chemical reactions to participate in the lubrication film formation and helped achieve a low friction coefficient and wear rate.Keywords:friction modifiers;solid lubricant additives;fluorocarbons;friction mechanisms
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International Wound Journal
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2021
·Vol. 19
·期 3
·679-691
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IF 3.315
Meiping Dong,Yi Mao,Zhiwei Zhao,Jinbo Zhang,Lipeng Zhu,Linlu Chen,Liexiang Cao
The development of biologically active multifunctional hydrogel wound dressings can assist effectively to wound regeneration and also has influenced multiple functions on wound injury. Herein, we designed a carbon-based composited injectable silk fibroin hydrogel as multifunctional wound dressing to provide effective anti-bacterial, cell compatibility and in vivo wound closure actions. Importantly, the fabricated injectable hydrogel exhibit sustained drug delivery properties, anti-oxidant and self-healing abilities, which confirm that composition of hydrogel is highly beneficial to tissue adhesions and burn wound regeneration ability. Frequently, designed injectable hydrogel can be injected into deep and irregular burn wound sites and would provide rapid self-healing and protection from infection environment with thoroughly filled wound area. Meanwhile, incorporated carbon nanofillers improve injectable hydrogel strength and also offer high fluid uptake to hydrogel when applied on the wound sites. In vitro MTT cytotoxicity assay on human fibroblast cell lines establish outstanding cytocompatibility of the injectable hydrogel and also have capability to support cell growth and proliferations. In vivo burn wound animal model results demonstrate that the hydrogel dressings predominantly influenced enhanced wound contraction and also promoted greater collagen deposition, granulation tissue thickness and vascularization. This investigation's outcome could open a new pathway to fabricate multifunctional biopolymeric hydrogel for quicker burn wound therapy and effectively prevents microenvironment bacterial infections.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Xianhui Peng,Yang Liu,Siqi Hu,Pengfei Zheng,Yidan Fu,Peng Dong,Jie Xiao,Lina Han,Yingjie Zhang
Due to the bonding force between the surface Co atom and the adsorbed intermediate are so strong that intermediate cannot desorb from Co atom, the oxygen reduction reaction of Co 2 P based electrocatalyst cannot satisfy the commercialized application of the Zn-air battery. In this work, a GO-induced assembly strategy was designed to construct cobalt phosphide (Co 2 P) nanoparticles encapsulated in N-doped carbon nanotubes (Co 2 P@NCNTs). The experimental results show that adding graphene oxide (GO) content has a significant impact on the formation of well-defined Co 2 P@NCNTs nanotubes structures and the exaltation of the graphitization degree. Benefitting from the synergistic effect between N-doped nanotubes and Co 2 P, the Co 2 P@NCNTs-15 electrocatalysts exhibited better catalytic performance, a more positive onset potential (0.90 V vs RHE) and half-wave potential (0.82 V vs RHE), maximum limiting diffusion current density (5.5 mA cm −2 ) and Tafel slope only 73 mV dec −1 . The potential gap (ΔE) between E j=10 of OER and ORR half-wave potential (E 1/2 ) of Co 2 P@NCNTs-15 is only 0.93 V, which lower than Pt/C electrocatalyst (1.15 V). More importantly, the Co 2 P@NCNTs-15-based rechargeable Zn-air battery performed the highest peak power density (159.7 mW cm −2 ), specific capacity (792.6 mAh g −1 at 10 mA cm −2 ) and remarkable cycle stability. This method also offers a high yield and cost-effective synthesis strategy for preparing the other transition metal phosphide electrocatalysts.
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高影响因子
ADVANCED POWDER TECHNOLOGY
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2021
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IF 4.833
Hongji Li,Jinyue Zhang,Dandan Wang,Junfu Wang,Wei Jiang,Tianyu Zhou,Chunbo Liu,Guangbo Che
In this study, it presents a novel surface-enhanced Raman scattering (SERS) imprinted membrane to be applied into the detection of trace-level antibiotic in aqueous samples. Graphene oxide- argentum (GO/Ag) composites are chosen as the SERS substrates to fabricate on poly(vinylidene fluoride) (PVDF) membrane surface, increasing the hydrophilia and promoting the sensitivity. The amount of GO is investigated to confirm the optimal concentration. Whereafter, in order to effectively apply into practical sample detection, the technique of molecular imprinting is also introduced to improve the selectivity of SERS membrane. The SERS imprinted membrane (AGP-MIM) is synthesized by the process of two-step precipitation polymerization and applied into the detection of enrofloxacin hydrochloride. The characteristics are adequately investigated and proved that the AGP-MIM can be applied into practical samples detection.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 32
·18061-18077
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IF 4.22
Xi Jufang,Zhang Liyun,Zheng Wenting,Zeng Qingle,He Yi,He Ze,Chen Jingyu
Highly efficient adsorbents, which can effectively remove both metal ions and dyes from wastewater with robust stability, are strongly required for the remediation of current polluted aqueous system, but still a challenge to be realized. Herein, a new adsorbent has been designed to solve this problem by anchoring diethylene triamine pentaacetic acid (DTPA) grafted polyethyleneimine (PEI) onto carboxylated GO (GOC-g-PD). Given the amino and carboxyl active groups from PEI and GOC/DTPA, our GOC-g-PD displays good adsorption capacity against not only inorganic metal ions (Cu 2+ and Pb 2+ ) but also organic dye (methylene blue: MB). The maximum adsorption capacity of GOC-g-PD for Cu 2+ , Pb 2+ and MB reached 309.60 mg·g −1 , 316.17 mg·g −1 and 262.10 mg·g −1 , respectively. Furthermore, our GOC-g-PD also exhibits good cycling stability and chemical stability against wide pH values. These outstanding properties revealed our GOC-g-PD held great potential in purifying the sewage discharged from industries. Graphical abstract
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 36
·16679-16688
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IF 3.591
Lijuan Zhang,Dongqing Zhao,Yao Lu,Jinghan Chen,Haotian Li,Jinghan Xie,Yue Xu,Haikuan Yuan,Xijian Liu,Xueyan Zhu,Jie Lu
A highly efficient strategy was developed to fabricate a graphene oxide modified cellulose nanocrystal/PNIPAAm IPN (GO-CNC/PNIPAAm IPN) hydrogel, which was capable of effectively adsorbing cationic and anionic dyes. The adsorption of Congo red (CR) and methylene blue (MB) was investigated based on the effects of pH, adsorption isotherms, adsorption kinetics, and recycling experiments. The adsorption capacities for CR and MB of the GO-CNC/PNIPAAm IPN hydrogel adsorbent were 728.8 mg g−1 and 281.9 mg g−1, respectively, and the difference is due to complex electrostatic and chemisorption effects between the adsorbent and the dye, which could be explained using the Langmuir isotherm adsorption model and pseudo-second-order kinetics model. In addition, the GO-CNC/PNIPAAm IPN hydrogel could be used repeatedly, and the adsorption capacities for CR and MB were 84.9% and 82.4% of the original hydrogel after five re-adsorption experiments, respectively. This type of adsorbent provided the advantages of being low-cost, having simple preparation, being non-polluting, and having good adsorption effects and a long service life, which is promising for its use in dye wastewater treatment in the future.
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Journal of Materials Chemistry A
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2021
·Vol. 9
·期 40
·23243-23255
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IF 12.732
Hongjie Chen,Jianren Huang,Jiantao Liu,Jianfeng Gu,Jundong Zhu,Bing Huang,Jin Bai,Jinquan Guo,Xiaoxiang Yang,Lunhui Guan
The conductive hydrogel has shown extensive applications in multifunctional sensors. However, the intrinsic characteristics of conductive hydrogels, such as lacking anti-freezing, mechanical strength, and being easily dehydrated have hindered their application in wearable devices. Herein, reduced graphene oxide (rGO) and graphene oxide (GO) nanosheets were incorporated into a porous cross-linking poly(vinyl alcohol) (PVA) hydrogel network within dimethyl sulfoxide (DMSO)/H2O binary solvent. A honeycomb-like dense micro-network and uniform dispersion conductive tough fillers endow high toughness (3.1 MPa @ 600% strain) and conductivity to the organohydrogel. With the intense interaction between water and DMSO, the organohydrogel exhibits reliable mechanical and electronic performance in a wide range of temperatures (−30 to 60 °C) and possesses excellent ambient stability. The organohydrogel had excellent sensitivity and linear repeatable response ability in both mechanical and thermal stimulation. With the integrated unique features, the sensitive organohydrogel was developed for a multifunctional sensor. As a strain/pressure sensor, it exhibited a sensitive response to the applied tensile or compressed strain with repeatability and durability. As a temperature sensor, it presented excellent linear and reliable thermal response with a high sensing accuracy. This work provides a new paradigm for designing a wearable multifunctional sensor or E-skin, which is used to detect the motion or temperature of the human in the future.
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COLLOID AND POLYMER SCIENCE
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2021
·Vol. 299
·期 11
·1767-1776
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IF 1.931
Jiang Yuxiang,Li Zaifeng
Polyurethane-functionalized graphene oxide (MGO) was fabricated by surface modification of graphene oxide (GO) with a self-made waterborne polyurethane. MGO/polyurethane (MGO/PU) elastomer was produced by in situ polymerization. The structure and properties of GO and MGO and their effect on polyurethane elastomer were investigated. The results show that after the waterborne polyurethane successfully grafted and modified, the ordered crystal structure of GO transforms into the disordered structure, as well as its interlayer spacing becomes larger and the lipophilicity of GO improves greatly. The addition of MGO could promote the formation of hydrogen bonding of the PU and reduce the breaking speed of the hydrogen bonding. In addition, the results of thermogravimetric analysis and temperature-dependent mechanical properties indicate that the thermal stability and mechanical properties of MGO/PU are better than PU and GO/PU. Graphical abstract
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高影响因子
Biomolecules
·
2021
·Vol. 11
·期 10
·1399
·
IF 4.879
Kongliang Xu,Bin Wang,Chenlu Si,Chaoping Lin,Renchao Zheng,Yuguo Zheng
As a type of important and versatile biocatalyst, amidase immobilization on solid materials has received broad attention with its relatively easy procedure and available reusability. However, current porous supports have suffered from limited loadings, and it is highly desired to develop a new type of material with abundant space so as to ensure a high loading of amidase. Here, graphene oxide was adopted as the support for amidase immobilization, which showed the highest loading capacity for amidase (~3000 mg/g) to date. To the best of our knowledge, it is the first case of amidase immobilized on graphene oxide. Through surface modulation via reducing the contents of oxygen-containing functional groups, activity recovery of immobilized amidase increased from 67.8% to 85.3%. Moreover, surface-modulated graphene oxide can efficiently uptake amidase under a wide range of pH, and the maximum loading can reach ~3500 mg/g. The resultant biocomposites exhibit efficient biocatalytic performance for asymmetric synthesis of a chiral amino acid (i.e., L-4-fluorophenylglycine, an intermediate of aprepitant).Keywords:amidase;enzyme immobilization;graphene oxide;high loading;biocatalysis;surface modulation
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