Biomedical Physics & Engineering Express
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2019
·Vol. 5
·期 2
·025002
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IF 0
Orwa Shueibi,Ziyan Zhou,Xianliu Wang,Bingcheng Yi,Xing He,Yanzhong Zhang
Graphene oxide (GO) and reduced graphene oxide (rGO) are two of the most representative graphene derivatives that can be employed to engineer bioactive and/or electroactive scaffolds for neural tissue engineering (NTE). However, a comparison with regard to their chemical structural impact on cytocompatibility has yet to be performed. In this study, GO was prepared using a modified Hummers' method followed by thermal treatment to obtain the rGO. Thereafter, a stable jet electrospinning approach was used to electrospin a viscous mixed solution of polycaprolactone (PCL)/poly(ethylene oxide) (PEO) (mass ratio 4:1) containing a tiny amount of GO and rGO (1% w/w), for the generation of highly-aligned nanoscale fibers of PCL-PEO-GO and PCL-PEO-rGO, respectively. Structural characteristics and physicochemical properties of the GO and/or rGO incorporated PCL-PEO nanofibers were characterized by various analytical techniques including Raman, FTIR, SEM, water drop contact angle, cyclic voltammetry and tensile testing. Finally, biological study in vitro by culturing the fibrous scaffolds with murine Schwann cells for cytocompatibility evaluation demonstrated that comparatively PCL-PEO-GO scaffold could more favorably promote the proliferation of the Schwann cells. However, considering the noted higher electroconductivity, the fibrous PCL-PEO-rGO may be applied to induce stem cell differentiation towards neural lineage. This research could provide a guidance for judicious selection of the GO and rGO incorporated nanofibers to construct electroactive scaffolds for engineering functional neural tissues.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Mingyan Chen,Jie Chen,Yucheng Liu,Jie Liu,Lingli Li,Bing Yang,Lili Ma
A new type of metal organic framework GO/Ni-MOF-199 was synthesized using the solvothermal method in combination with different amounts of graphene oxide (0%, 0.5%, 1.75% and 5%) in order to remove thiophene from model oil. The adsorption desulfurization performance was tested by removing thiophene from the n-octane/thiophene model oil. The thermal stability of composites is improved by modification. Adsorption capacity of MOF-199 was enhanced by doping Ni 2+ and graphene oxide (GO) with appropriate content. Bimetallic ions combine with the oxygen-containing function of GO to form a stronger synergistic effect. The synthesized samples are characterized using XRD , SEM, FTIR, BET, and TGA methods. By using the appropriate characterization methods, it is shown that an excessive GO content will damage the structures of the composites. The investigation’s results demonstrated that the maximum adsorption capacity of 1.75% GO/Ni-MOF-199 reached 50.38 mgS/g MOF at 35 ℃, and a v (oil) /m (absorbent) ratio of 150 ml/g occurred after 3.5 h of adsorption. Furthermore, the 1.75% GO/Ni-MOF-199 composites could be reused at least four times. The pseudo-second-order dynamic model and Langmuir model are more suitable to represent how the GO/Ni-MOF-199 materials adsorb thiophene from the model oil.
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Materials Research Express
·
2019
·Vol. 6
·期 11
·115075
·
IF 1.449
Shaofeng Zhou,Haoran Liu,Shuzhan Wang,Lin Gan,Jin Huang,Guizhe Zhao,Yaqing Liu
Designing and fabricating novel nanomaterials with good dispersion as lubricant additives through green and simple method has remarkably potential for reducing the industrial energy consumption and engineering material loss. This study introduced a electrostatic self-assembly method to prepare graphene-load ZrO2 nanocomposites (ZrO2@GO), and their dispersion characteristics and tribological performance were investigated using as lubricant additives in paraffin oils. ZETA potential, FTIR spectra, Raman spectra, XPS and TEM characterization confirmed ZrO2 nanoparticles had been anchored on the surface of GO nanosheets. With the introducing of polar functional groups and loading function of GO, the as-prepared ZrO2@GO nanocomposites indicated good dispersion stability in paraffin oil. Thus, compared with pure paraffin oil, friction coefficient and wear rate of ZrO2@GO added paraffin oil were reduced by 20.7% and 21.5% respectively. Optical microscope photograph, 3D morphology and rough results further presented ZrO2@GO exhibited good friction reduction and wear resistance performance than single ZrO2 or GO in paraffin oil. The possible tribological mechanisms were described by a tribological model that the ZrO2@GO nanocomposites could play a synergistic role of bearing frictional load of ZrO2 nanoparticles and forming transfer film of GO on the worn surface.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Chuanmin Ding,Xue Wang,Kaijing Song,Bing Zhang,Junwen Wang,Zhihuan Zhao,Honghong Chang,Wenlong Wei
Herein visible light was utilized as activator to enable colorimetric immunoassay to detect tumor marker based on ternary GO-C 3 N 4 -AgBr heterojunction nanophotocatalyst. Firstly, synthesized photocatalyst GO-C 3 N 4 -AgBr could oxidize TMB due to photogenerated hole and the oxidation ability was enhanced due to ternary heterojunction structure. Secondly, depending on the specific binding of antigen and antibody, the sandwich-type immunocomplex were constructed on the platform of magnetic bead with advantages of convenient cleaning and easy separation. Finally, TMB was added into the ABS buffer solution of immunocomplex. Under visible light radiation, fast change in color was observed within 10 s. Under optimal conditions, there was a linear relation between absorbance and target protein concentration in the range of 0.5 ng mL −1 –25 ng mL −1 with the detection limit of 20 pg mL −1 . Meanwhile, the developed colorimetric immunoassay displayed preferable selectivity, repeatability, and stability.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
·
IF 3.927
Mingmin Jia,Yi Feng,Jianhao Qiu,Xiong-Fei Zhang,Jianfeng Yao
UiO-66-NH 2 @GO nanoparticles were synthesized by growing UiO-66-NH 2 on graphene oxide (GO) nanosheets. The obtained nanoparticles were incorporated in polyimide (PI) matrix to improve the CO 2 separation performance. The crystalline structure, interaction between UiO-66-NH 2 and GO and the dispersion of UiO-66-NH 2 @GO were characterized by various techniques. Owning to the interaction between UiO-66-NH 2 and GO, UiO-66-NH 2 nanocrystals were well-anchored on GO sheets and the size was tailored. Also, it can be found that the high-aspect GO nanosheets in polymer matrix improved the dispersion of UiO-66-NH 2 nanoparticles. The high porosity of UiO-66-NH 2 @GO and inherent adsorption property to CO 2 significantly enhanced the gas separation performance of composite membranes compared to pristine PI membrane. The developed UN@GO-PI mixed matrix membrane with 5 wt% of UiO-66-NH 2 @GO loading showed excellent and stable CO 2 /N 2 separation performance with the CO 2 permeability of 7.28 Barrer and the CO 2 /N 2 selectivity of 52.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2014
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IF 2.129
Xiangying Sun,Bin Liu,Chuanxiao Yang,Congcong Li
In this work we designed a fluorescent self-assemblied multilayers, with thrombin aptamers and ssDNA as aptamer fixed onto the outermost layer, respectively. This multilayers can effectively sense biomolecules by interfacial florescence resonance energy transfer from multilayers to graphene oxide. High fluorescence quenching efficiency of graphene oxide and self-assemblied membrane’ concentration results in good sensitivity for biosensing. A new interfacial sensing method with extremely high sensitivity for thrombin and DNA sequence was established, and the detection limit for thrombin and DNA was 16.2 pM and 72.6 fM, respectively.
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RSC Advances
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2016
·Vol. 6
·期 92
·89221-89230
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IF 3.289
Jing Hong,Changhua Liu,Xi Deng,Ting Jiang,Lin Gan,Jin Huang
SiO2 coated with graphene oxide (GO) hybrids (SiO2@GO) were fabricated by electrostatic self-assembly and introduced into an epoxy polymer (EP) matrix to prepare epoxy composites by a solvent-free curing process. The thermal stability, mechanical properties and tribological behavior of SiO2@GO/EP composites were investigated and compared. It was found that the epoxy composites with the aligned core–shell structure of SiO2@GO improved the thermal stability, as well as excellent mechanical and tribological properties. The low content 0.5 wt% SiO2@GO/EP nanocomposites exhibited nearly 88.4% reduction in the friction coefficient and several orders of magnitude reduction in wear rate, constituting a potential breakthrough for future tribological applications. Compared with unfilled epoxy polymers or epoxy polymers with unmodified fillers, the major increase in the tribological properties of the SiO2@GO/EP composites shows the synergy effect between nano-SiO2 and GO during the wear process. The behavior of nano-SiO2 and GO were probably mostly due to ball-bearing and an ultrathin lamellar effect, respectively. The obtained results indicate that the core–shell structure of SiO2@GO as a more effective synergistic system is a valid method for greatly improving the friction and wear properties and mechanical properties of resin-based composites.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 10
·1-13
·
IF 2.8
Ge Rui,Shi Bin,Liu Xiaobo,Yin Bing
With the development of the internet of things technology, sensors have played an important role in aerospace, industry, agriculture, medical and other fields. Especially in the aspect of wearable respiratory monitoring, real-time monitoring of multiple respiratory physiological parameters through intelligent sensors enable people to achieve early prevention and timely diagnosis of respiratory diseases. However, most of the humidity sensors have the disadvantages of poor permeability, long response time and narrow detection range. Therefore, this paper introduced a flexible humidity sensor with a wide detection range and fast response time for respiratory monitoring. The sensor used PEDOT:PSS-GO composite material as humidity sensitive material. Due to the addition of GO, the sensor had a wide linear detection range of humidity (35–80%RH) and a short response/recovery time (0.53/0.8 s). Moreover, the sensor used the micromesh structure of PI as the substrate, which had better flexibility and permeability and the sensor was easy to attach to complex surfaces such as masks or human skin. Based on these excellent sensing characteristics, the humidity sensor was connected with a miniature wireless communication component for human respiratory detection. The humidity sensor can clearly show the difference between normal and abnormal respiratory signals and this provided a new idea for the intelligent healthcare technology.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2024
·
IF 8.1
Tianqi Jiang,Jialiang Zhou,Ruixue Wang,Hengxue Xiang,Jinqi Wang,Zexu Hu,Senlong Yu,Gongxun Zhai,Chao Jia,Meifang Zhu
Achieving rapid and long-term antibacterial effects in medical protective textiles is a significant challenge. In this work, Cu 2 O-GO nanocomposites are prepared by in-situ growth of small-sized cuprous oxide (Cu 2 O) nanoparticles on the surface of graphene oxide (GO). At a concentration of 20 µg/mL, Cu 2 O-GO achieves 99 % antibacterial rate against E. coli and B. subtilis within 10 min, with complete eradication in 30 min. After 6 months of air exposure, the Cu 2 O-GO exhibits an antibacterial efficacy of 84.7 % against B. subtilis and 96.7 % against E. coli , significantly higher than that of Cu 2 O alone. PA6/Cu 2 O-GO fibers produced via melt spinning show over 99.99 % antibacterial efficiency at just 0.6 % addition and retain effectiveness even after 50 washes. The antibacterial mechanism of Cu 2 O-GO involves the release of copper ions and generation of reactive oxygen species, which disrupt bacterial cell membranes, leading to protein and DNA damage, ultimately causing cell death. This research offers valuable insights for the development of long-term antibacterial materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Rui Ge,Teng Huo,Ming Xue Nie,Juan Lu,Haijun Hou,Xia Zhan
Graphene oxide membrane (GOM) possesses ultrafast and tunable two-dimensional water transport pathways, making it an ideal candidate for nanofiltration separation of dye wastewater. However, GOM also faces great challenges such as poor aqueous stability, collapse of non-oxygenated regions under high pressure, and limitations imposed by trade-off effects. In this study, covalent organic frameworks (COFs) were in-situ formed within GOM interlayers and on membrane surface to enlarge interlayer spacings and enhance hydrophilicity of GOM simultaneously via a two-step method including monomer retention in GOM and in-situ confined interfacial polymerization of COFs. Fourier transformation infrared spectroscopy (FT-IR) and X-ray photoelectron spectrometry (XPS) results confirmed the successful synthesis of COF on GOM surface, which enhanced membrane surface hydrophilicity and bridged the split defects of GOM. According to X-ray diffraction measurements (XRD) and scanning electron microscope (SEM) results, COF@GO membranes possessed enlarged interlayer spacings and increased thickness of selective layer, which indicated the successful intercalation of COF into GO interlayer. COF@GO-50 membrane exhibited an ultrahigh pure water permeability (PWP) of 148.1 L/(m 2 ·h·bar), with 99.0 % rejection for direct red 80 (DR80) aqueous solution and 9.6 % NaCl rejection. The ultrahigh water permeance might be ascribed to the enlarged interlayer pathways, the shortened vertical pathways provided by in-plane pores of COF nanosheets, and enhanced water adsorption capacity due to enhanced membrane hydrophilicity. Moreover, COF@GO nanofiltration membrane demonstrated excellent anti-fouling properties and long-term stability in 30h continuous operation, maintaining considerable separation efficiency under harsh conditions. This work provides a straightforward and applicable strategy to simultaneously enlarge interlayer spacings and enhance surface hydrophilicity of GOM via in-situ confined preparation of COFs, achieving ultrahigh water permeance and overcoming the trade-off effect between permeability and selectivity of GOM.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jie Zhang,Xiaofeng Li,Feng Yang,Zhengdong Ouyang,Pan He,Zhimin Jia,Honghan Long,Ningning He,Yingdan Zhang,Yingdi Zou,Bo Jiang,Ziqian Han,Guohong Tao,Ning Liu,Yang Li,Lijian Ma
The efficient preparation of two-dimensional large-sized monolayer covalent organic framework (COF) nanosheets for highly permeable membranes has posed a long-standing challenge in the COF field. While the self-exfoliation of charged COFs represents a promising method for nanosheet production, its efficiency requires further enhancement. In this study, we present a novel finding that the presence of hydroxyl groups on the monomer significantly influences the self-exfoliation efficiency of charged COFs. Through precise regulation of hydroxyl group numbers on the monomers, we successfully achieved the efficient fabrication of large monolayer cationic COF nanosheets with impressive solubilities in common organic solvents. By virtue of their positive charge, COF monolayer nanosheets rapidly interacted with negatively charged monolayer graphene oxide (GO) in solution, facilitating their assembly into interlaced composite membranes through electrostatic interactions. The composite membranes benefited from the strong Coulombic attraction between the COF and GO nanosheets, leading to enhanced membrane stability, while the shielding effect of GO on the COF pores contributed to improved size sieving efficiency. This innovative strategy enabled the composite membranes to achieve highly selective separation of ReO4– and MoO42–, with a remarkable 100% interception rate for MoO42–.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wentao Wu,Gaojie Zhao,Liangyong Chu,Jian Wu,Kexin Miao,Liming Shen,Xiaobao Li,Ningzhong Bao
The giant reduction of the barrier properties due to self-healing microcapsules and the lack of real-time protection during the healing remained the main challenges in self-healing anticorrosion coatings. Herein, a facile strategy using Janus graphene oxide (GO) as a dense and flexible shell has been proposed to synergistically solve these challenges. Benzotriazole (BTA) was used to synthesize Janus GO at the oil–water interface, and Janus GO/BTA/poly(methyl methacrylate) microcapsules were prepared. Energy-dispersive X-ray spectroscopy, Fourier infrared spectroscopy, Raman spectroscopy, and ultraviolet spectrophotometer analysis confirmed the formation of a Janus GO structure with one surface hydrophilic and the other hydrophobic. The surface morphology of J-GO-capsules with a high GO coverage rate was observed by scanning electron microscopy. The high biobased content coating containing J-GO-capsules showed a low-frequency impedance value above 1010 as assessed by electrochemical impedance spectroscopy after being immersed in 3.5 wt % NaCl solution for 60 days. In addition, the low-frequency impedance values of the coating were maintained after being scratched due to the self-healing properties of the J-GO-capsules as well as the real-time protective effect of the BTA. Biobased coatings with the best overall properties among all of the self-healing anticorrosion coatings were prepared.
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