Frontiers in Bioengineering and Biotechnology
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2020
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IF 3.644
Li Jianfeng,Liu Xiao,Crook Jeremy M.,Wallace Gordon G.
Tissue engineering, based on a combination of 3D printing, biomaterials blending and stem cell technology, offers the potential to establish customized, transplantable autologous implants using a patient‘s own cells. Graphene, as a two-dimensional (2D) version of carbon, has shown great potential for tissue engineering. Here, we describe a novel combination of graphene with 3D printed alginate (Alg)-based scaffolds for human adipose stem cell (ADSC) support and osteogenic induction. Alg printing was enabled through addition of gelatin (Gel) that was removed after printing, and the 3D structure was then coated with graphene oxide (GO). GO was chemically reduced with a biocompatible reductant (ascorbic acid) to provide electrical conductivity and cell affinity sites. The reduced 3D graphene oxide (RGO)/Alg scaffold has good cytocompatibility and can support human ADSC proliferation and osteogenic differentiation. Our finding supports the potential for the printed scaffold’s use for in vitro engineering of bone and other tissues using ADSCs and potentially other human stem cells, as well as in vivo regenerative medicine.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Haojie Zeng,Zongxue Yu,Liangyan Shao,Xiuhui Li,Meng Zhu,Yuchuan Liu,Xiaofang Feng,Ximei Zhu
A composite membrane based on a novel strategy was prepared which using graphene oxide (GO), UiO-66-NH 2 and polyacrylic acid (PAA) as basic materials on the surface of nylon membrane by vacuum filtration self-assembly. The structure of the composite membrane was made of graphene oxide as vertical separation layer, the PAA@UiO-66-NH 2 (PAA@UiO) embedding between GO as horizontal capture material. The PAA@UiO-66-NH 2 /GO (PAA@UiO/GO) membrane was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Compared with the GO membrane, PAA@UiO/GO membrane combined the effects of GO, UiO-66-NH 2 and PAA, which significantly enhances the separation performance of dye wastewater. In particular, the PAA@UiO/GO membrane can achieve complete removal of MB , RB and CR while the fluxes during filtration process can reach about 100 L ∙ m - 2 ∙ h - 1 . At the same time, PAA@UiO/GO membrane almost retained stable removal rate on all dyes under extreme pH and ionic strength conditions. In addition, after 10 cycles of experiments, PAA@UiO/GO membrane retained a removal rate and a flux more than 95% and 85 L ∙ m - 2 ∙ h - 1 for all dyes, respectively. Compared to a composite membrane based on intercalation, the unique structure of PAA@UiO/GO membrane with a large number of adsorption sites and screening structures, resulting a better removal rate for dyes. Furthermore, PAA@UiO/GO membrane has a great potential in practical applications and a solution to balance trade-off effect.
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MATERIALS CHARACTERIZATION
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2020
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IF 3.562
Zhen Wang,Yanjiao Zhu,Haibin Yu,Zhifeng Li
Hexagonal boron nitride nanosheets (h-BNNS) and graphene (G) are considered to be the representative materials in the two-dimensional (2D) materials community. h-BNNS and G are considered to exhibit high potential in thermal management materials for their prominent thermal conductivity . However, the conventional methods to synthesize h-BNNS and G are restricted by several problems (e.g., high energy consumption, environmental pollution and complex preparation methods). In the present study, a xylitol (C 5 H 12 O 5 )-assisted ball milling method was developed for scalable synthesis of a 2D material mixture of h-BNNS and graphene (BNNS@G). With this method, about 52% yield could be achieved. Moreover, the produced mixture was re-dispersed; it also exhibited high stability in water. The method proposed in this study is capable of effectively transferring green chemistry solutions to the preparation. Besides, a green solution was also proposed to apply the synthesized BNNS@G. The as-obtained BNNS@G was mixed with the cellulose nanofiber solution to form a series of G@BNNS/CNF membranes that exhibited high flexibility and ultrahigh thermal conductivity. Furthermore, 70 wt% BNNS@G membrane (3.4 W/mK) exhibited the in-plane thermal conductivity 300% higher than the membrane without BNNS@G. Thus, it is suggested that the synthesized membranes exhibit high potentials in the thermal management of portable mobile devices.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Luyao Su,Jie Mao,Sui Wang,Yufang Hu
Herein, the paper developed a bimodal electrochemiluminescence (ECL) method based on dual-enhancement Ru(bpy) 3 2+ /CQDs/AA system combined with magnetic field enhanced solid-phase microextraction (MFE-SPME) for the direct determination of ascorbic acid (AA). The nanocomposite of Fe 3 O 4 @CS@GO, as a magnetic adsorbent, could efficiently extract AA under the external magnetic field provided by the magnetic glassy carbon electrode (MGCE) with the extraction efficiency up to 89.2%. Based on carbon quantum dots (CQDs) as the co-reactant for Ru(bpy) 3 2+ , when the potential was swept cyclically between −3.5 and 2.0 V, the bimodal ECL emissions were obtained in the Ru(bpy) 3 2+ /CQDs/AA system and were enhanced as AA concentration increased. The method could quantitatively detect AA, because the ln(ECL-1/ECL-2) of bimodal ECL system was in a good linear relationship with the negative logarithm of the AA concentration in the range of 10 −5 –10 −9 M with the limit of detection (LOD, S/N = 3) of 330 pM. After a series of evaluations, the method exhibited good sensitivity, satisfactory repeatability and excellent anti-interference, demonstrating that the developed method had great application potential in analysis fields.
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SYNTHETIC METALS
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2020
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IF 3.286
Ke Qu,Yuqi Bai,Bo Chen,Miao Deng
Researchers have been focusing on the electrochemical energy storage system to tackle with the current energy crisis problem. With the increased demand of wearable electronics, all-solid-state flexible supercapacitors are becoming promising energy storage device. In this study, a simple and facile method was practiced to prepare hybrid composites by integrating molybdenum disulfide (MoS 2 ) and graphene oxide (GO) as dual dopants to co-dope conducting polymer polyaniline (PANI), affording the PANI/MoS 2 /GO composite via in situ chemical oxidative polymerization. The as-prepared PANI/MoS 2 /GO composite was characterized by various spectroscopic methods, ranging from X-ray powder diffraction, infrared spectroscopy to scanning electron microscopy. The supercapacitive properties of the prepared dual dopant-doped composite as electrode materials have been evaluated electrochemically and yielded specific capacitance of 130.4 F/g under 1.0 A/g current density. Excellent rate performance was observed for the PANI/MoS 2 /GO composite, giving specific capacitance of 96.7 F/g with 10.0 A/g current density applied. The composite remained to give an excellent capacitance retention of 98.5 % after 500 galvanostatic charge-discharge cycles, which demonstrated the unique stabilizing effects of MoS 2 and GO dual dopants toward PANI’s energy storage behavior in terms of supercapactive performances. The findings in this study will contribute significantly to the progress of conducting polymer-based energy storage materials.
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Energy Storage Materials
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2020
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IF 16.28
Chao Li,Banggui Lao,Zhike Li,Huibin Yin,Zhenyu Yang,Hongyu Wang,Deliang Chen,Xiaoli Zhang,Yongjun Xu,Chenghua Sun
Dual-ion batteries (DIBs) offer unique merits for energy storage, such as high energy density and excellent safety, but are usually limited by sluggish kinetics for anions intercalation into graphite cathodes under high voltage range (≥5.4 V). Here, we reported MoS 2 as a novel cathode to store anion owing to larger layered spacing (~ 6.15 Å) than graphite (~ 3.35 Å). Such structure can effectively improve anion intercalation kinetics and achieve excellent stability in a wide voltage window (below 5 V). Complete batteries have been further fabricated, achieving stable cycling performance with promising working voltage and energy density, which exceeds most reported DIBs.
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Royal Society Open Science
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2020
·Vol. 7
·期 7
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IF 2.646
Mingjun Niu,Hao Wang,Jing Li,Hongyan Chen,Lin Li,Huige Yang,Xuying Liu,Zhihao Chen,Hongzhi Liu,Jinzhou Chen
Strength and toughness are both of great importance for the application of polylactic acid (PLA). Unfortunately, these two properties are often contradictory. In this work, an effective and practical strategy is proposed by using carboxylated graphene oxide (GC) grafted with polyethylene glycol (PEG), i.e. GC-g-PEG. The synthesis procedure of GC-g-PEG is firstly optimized. Then, a series of PLA nanocomposites were prepared by the melt blending method via masterbatch. In comparison to that achieved over pure PLA, these nanocomposites are of higher crystallinity, thermal stability and mechanical strength. This is mainly attributed to well-tailored interface and good dispersion. Especially, while retaining the tensile strength of the original PLA, the elongation at break increases by seven times by adding 0.3 wt% GC-g-PEG.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Mengjie Zhang,Jiaxin Cui,Tao Lu,Guosheng Tang,Shutian Wu,Wenjing Ma,Chaobo Huang
This work proposes an anti-corrosive nanofibrous membrane by combining one-pot solvothermal reduction method and electrospinning technology as a solution to the ever-increasing water pollution issues. Such membrane is made of aromatic polymer-polyimide and further modified by reduced graphene oxide, which maintained the original performance under different external environment and multi-cycled test, and achieved high separation efficiency (99.19%) and flux (2040.04 L m -2 h −1 ) at the same time. The purification process is suitable for various contaminants and different combinations. Additionally, the inherent purification mechanism was fully explored in this study. The practicability of the membrane can be tested for the contaminated water purification, the recycle of poisonous and harmful substances, pre-process of precision extraction and so on.
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JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 29
·14137-14152
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IF 3.553
Ji Jingqi,Zhao Jianqing,Ke Yangchuan
Abstract There has been growing interest in using nanomaterials to improve the comprehensive properties of polymer microspheres as plugging agents in the oil industry. Chemically functionalized graphene was prepared via water-phase direct exfoliation by cell fragmentation. The resultant graphene nanosheets were used to fabricate poly(acrylamide-acrylic acid-4-acryloylmorpholine)-based nanocomposite microspheres via in situ emulsion polymerization. Microspheres containing 0.3 wt% graphene (Graphene 0.3/terpolymer) showed high water retention and heat and shear resistance. Moreover, these microspheres exhibited improved nanomechanical properties, implying high dispersity and flowability in aqueous media. A rheology test demonstrated that the suspension of Graphene 0.3/terpolymer behaved as a Newtonian fluid under high shear conditions, which indicated an improvement in the migration ability in the plugging process. The substantially improved comprehensive properties ensured a deep profile control and enhanced oil recovery of Graphene 0.3/terpolymer microspheres. This research revealed that graphene can serve as a promising filler for fabricating high-performance microspheres in industry. Graphic abstract
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FOOD CHEMISTRY
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2020
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IF 6.306
Yijian Zhao,Xiaohan Zheng,Qinzhi Wang,Taotao Zhe,Yaowen Bai,Tong Bu,Meng Zhang,Li Wang
Various pesticides employed in modern agriculture result in large amounts of pesticide residues in agricultural production, greatly threatening human health. Herein, we report a facile approach to fabricate a reduced graphene oxide/cyclodextrin modified glassy carbon electrode (rGO/CD/GCE) for the sensitive electrochemical sensing of imidacloprid (IDP). Three different modified electrodes using CDs ( α -, β -, γ -CD) were fabricated, and their electrochemical performance was further studied. The results demonstrate that α -CD possesses the best signal amplification for IDP. Compared with wet-chemical synthesis of rGO/CDs (W-rGO/CDs), the electrochemical synthesis of rGO/CDs (E-rGO/CDs) produced sensors that showed better performance for IDP sensing. Taking advantage of prepared E-rGO/ α -CD nanocomposite, the fabricated sensor offered a low detection limit (0.02 μM) with a wider linear range (0.5–40 μM) and long-term stability. The new sensor was successfully applied for the detection of IDP in brown rice, providing a new technique for efficient and convenient monitoring of pesticide residues in food.
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CHEMOSPHERE
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2020
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IF 5.778
Danping Wu,Fangfang Li,Quan Chen,Min Wu,Wenyan Duan,Qing Zhao,Bo Pan,Baoshan Xing
Significant degradation of organic contaminants in biochar sorption systems has recently been reported, demonstrating a promising potential application of biochar in pollution control . We hypothesized that the degradation of organic chemicals by biochar may be further enhanced under irradiation by UV light due to the photocatalytic activities of carbonaceous materials . Our results confirmed that UV conditions increased the degradation of rhodamine B (RhB) by up to three times compared to dark conditions. Washing biochar with ultrapure water further increased RhB photodegradation by up to ten times. This photodegradation increase was the highest for biochar produced at 1000 °C. HF treatment and the addition of biochar supernatant did not increase RhB photodegradation. Therefore, the biochar properties mediating RhB photodegradation may be related to solid particles, mostly the combination of graphite structures and organic functional groups. Based on XPS and FTIR analysis, we propose that the quinoid C O in biochar may play an essential role in RhB photodegradation. Further research on identifying the photoactive components of biochar will be fundamental for improved biochar manufacture and application.
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Polymers
·
2020
·Vol. 12
·期 5
·1116
·
IF 3.426
Gang Ma,Junjie Qi,Qifan Cui,Xueying Bao,Dong Gao,Chengfen Xing
The multifunctional photothermal therapy (PTT) platform with the ability to selectively kill bacteria over mammalian cells has received widespread attention recently. Herein, we prepared graphene oxide-amino(polyethyleneglycol) (GO-PEG-NH2) while using the hydrophobic interaction between heptadecyl end groups of 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[amino(polyethyleneglycol)] (DSPE-PEG-NH2) and graphene oxide (GO). Based on GO-PEG-NH2, the versatile PTT system was constructed with simultaneous selective recognition, capturing, and photothermal killing of bacteria. When the cells undergo bacterial infection, owing to the poly(ethylene glycol) (PEG) chains and positively charged amino groups, GO-PEG-NH2can specifically recognize and capture bacteria in the presence of cells. Meanwhile, the stable photothermal performance of GO-PEG-NH2enables the captured bacteria to be efficiently photothermally ablated upon the irradiation of 808 nm laser. Besides, the GO-PEG-NH2is highly stable in various biological media and it exhibits low cytotoxicity, suggesting that it holds great promise for biological applications. This work provides new insight into graphene-based materials as a PTT agent for the development of new therapeutic platforms.Keywords:photothermal therapy (PTT);graphene oxide (GO);selective recognition and capturing;antibacterial
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