Biomedical Materials
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2021
·Vol. 16
·期 6
·065024
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IF 3.715
Ruochen Luo,Yiqian Huang,Xiaojing Yuan,Zuoying Yuan,Liwen Zhang,Janming Han,Yuming Zhao,Qing Cai
For craniofacial bone regeneration, how to promote vascularized bone regeneration is still a significant problem, and the controlled release of trace elements vital to osteogenesis has attracted attention. In this study, an ion co-delivery system was developed to promote angiogenesis and osteogenesis. Magnesium ions (Mg2+) and lanthanum ions (La3+) were selected as biosignal molecules because Mg2+ can promote angiogenesis and both of them can enhance bone formation. Microspheres made of poly(lactide-co-glycolide) were applied to load La2(CO3)3, which was embedded into a MgO/MgCO3-loaded cryogel made of photocrosslinkable gelatin methacryloyl to enable co-delivery of Mg2+ and La3+. Evaluations of angiogenesis and osteogenesis were conducted via both in vitro cell culture using human bone marrow mesenchymal stromal cells and in vivo implantation using a rat model with calvarial defect (5 mm in diameter). Compared to systems releasing only Mg2+ or La3+, the combination system demonstrated more significant effects on blood vessels formation, thereby promoting the regeneration of vascularized bone tissue. At 8 weeks post-implantation, the new bone volume/total bone volume ratio reached a value of 40.1 ± 0.9%. In summary, a properly designed scaffold system with the capacity to release ions of different bioactivities in a desired pattern can be a promising strategy to meet vascularized bone regeneration requirements.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Hang-bo Zheng,Yu-ling Li,Yuan-li Wang,Feng Ma,Peng-zhao Gao,Wen-ming Guo,Hang Qin,Xiao-pan Liu,Han-ning Xiao
The development of efficient, inexpensive, and stable hydrogen evolution reaction (HER) electrocatalysts is the key to large-scale water electrolysis technologies for hydrogen production. Constructing heterojunction electrocatalysts has become one of the effective strategies for designing high-performance HER electrocatalysts due to their unique heterogeneous interfaces. Herein, a new strategy of PH 3 assisted synthesis of metaphosphate is reported, which is used to construct Co(PO 3 ) 2 @NPC/MoS 2 heterostructures (where NPC is N-doped porous carbon). The results show that the formation of Co(PO 3 ) 2 @NPC/MoS 2 heterogeneous interfaces can optimize the electronic structure of the electrocatalyst and greatly improve its HER performance. As a result, a lower overpotential of 119 mV at 10 mA cm −2 is obtained in alkaline electrolyte . This work provides a new perspective for the design of high-performance electrocatalysts for electrocatalytic water splitting.
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Chemical Science
·
2021
·Vol. 12
·期 43
·14432-14440
·
IF 9.825
Jing Yan,Yu Qin,Wen-Ting Fan,Wen-Tao Wu,Song-Wei Lv,Li-Ping Yan,Yan-Ling Liu,Wei-Hua Huang
Recently, stretchable electrochemical sensors have stood out as a powerful tool for the detection of soft cells and tissues, since they could perfectly comply with the deformation of living organisms and synchronously monitor mechanically evoked biomolecule release. However, existing strategies for the fabrication of stretchable electrochemical sensors still face with huge challenges due to scarce electrode materials, demanding processing techniques and great complexity in further functionalization. Herein, we report a novel and facile strategy for one-step preparation of stretchable electrochemical biosensors by doping ionic liquid and catalyst into a conductive polymer (poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate), PEDOT:PSS). Bis(trifluoromethane) sulfonimide lithium salt as a small-molecule plasticizer can significantly improve the stretchability and conductivity of the PEDOT:PSS film, and cobalt phthalocyanine as an electrocatalyst endows the film with excellent electrochemical sensing performance. Moreover, the functionalized PEDOT:PSS retained good cell biocompatibility with two extra dopants. These satisfactory properties allowed the real-time monitoring of stretch-induced transient hydrogen peroxide release from cells. This work presents a versatile strategy to fabricate conductive polymer-based stretchable electrodes with easy processing and excellent performance, which benefits the in-depth exploration of sophisticated life activities by electrochemical sensing.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jinchao Fang,Yuji Chen,Chuanjie Fang,Liping Zhu
In this work, we report on a regenerable and robust adsorptive membrane with superb dynamic adsorption capacity towards dyes prepared by a controllable mussel-inspired co-deposition of dopamine (DA) and polyethyleneimine (PEI) on a polyvinylidene fluoride (PVDF) microfiltration membrane. The DA oxidative self-polymerization occurred to form polydopamine for high adhesion with the PVDF membrane. On the other hand, the PEI provided a large number of amino groups with high adsorption ability, and had both Michael addition and Schiff base reaction with DA to induce covalent interaction for high stability. In addition, the co-deposition process was controlled to happen on the membrane surface and inside the membrane bulk pores simultaneously. By these ingenious designs, the prepared adsorptive membrane thus showed high dynamic adsorption capacity (up to 188 mg g −1 ) and ultra-high removal ratio (＞99.9%) towards typical anionic dye of methyl blue. Not only that, the membrane could separate rapidly and selectively anionic dyes from dye mixtures. More importantly, the adsorptive membrane showed highly regenerative ability in NaOH solution (after 6 recovery cycles, the treating efficiency maintained higher than 95%), and good durability with robust resistance in acidic and alkaline environments. This work affords an innovative strategy and insight in fabricating the adsorptive membrane using mussel-inspired co-deposition for organic dye removal in water.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Jing Wang,Hanyue Deng,Yajuan Sun,Cheng Yang
A biocompatible oil-in-water emulsion containing no surfactant or other organic modifier was prepared using two negatively charged, naturally derived materials: alginate and montmorillonite (MMT), and it was found that the stable emulsion has good storage stability and coalescence stability. The dispersing and suspending effects of alginate to MMT were observed, and the interaction between alginate and MMT was confirmed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and Zeta potential. The distribution of particles at the oil-water interface and in the aqueous phase of the emulsion was observed by confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). A unique mechanism of the stable Pickering emulsion was then proposed. It is demonstrated that alginate not only thicken the continuous phase, create a gel-like environment around the droplets, but also could modify the MMT surface, synergistically enhance the electrostatic force of droplets due to the same charge property with MMT. Moreover, the rheological properties of the emulsion co-stabilized by MMT/Alginate can be well adjusted using various stimuli including pH and salt. In general, this work presents a highly stable, tunable and biocompatible emulsion for potential applications in food and cosmetic products.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Ai-Yue Wang,Kai Sun,Liping Wu,Ping Wu,Wenchao Zeng,Zhongmin Tian,Qun-Xing Huang
Different biomass materials (walnut shell, coconut shell or cottonwood sawdust) were co-pyrolyzed with carbon-enriched oily sludge to produce aqueous phase sulfamethoxazole (SMZ) adsorption materials. The co-pyrolysis char was activated with K 2 CO 3 to modify its micro-structure and functional groups. Results show that ACs prepared from the mixture contained more mesopores than biomass-based ACs, more porous and higher yield than oily sludge-based ACs. One-step activation method was more attractive than two-step activation in larger specific surface area (up to almost 4 times), wider pore size distribution (2–3 nm), stronger SMZ adsorption ability (higher than 2 times). The maximum BET surface area was 1342 m 2 /g for the ACs prepared from the mixture of walnut shell and oily sludge by one-step activation and it had the maximum SMZ adsorption capacity up to 361.9 mg/g, which is higher than previous reported values. The capacity of SMZ adsorption of ACs was mainly attributed to pore size distribution, specific surface area and functional groups. Among them, the appropriate content of C O and C O functional groups, larger specific area and more pores range from 2 to 3 nm lead to higher adsorption capacity.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Gang Shao,Junfang Liang,Wanyu Zhao,Biao Zhao,Wen Liu,Hailong Wang,Bingbing Fan,Hongliang Xu,Hongxia Lu,Yiguang Wang,Rui Zhang
Ultra-wide absorption bandwidth is one of the goals of ideal absorbing materials. In this article, three-dimensional porous microstructure Co/SiCN ceramic aerogel composites (CACs) were synthesized through a reverse microemulsion method, which is aimed to avoid the aggregation of cobalt nanoparticles , and makes better impedance matching between CACs surface and air to obtain an outstanding microwave absorption (MA) performance. The complex permittivity of the CACs could be tuned via the concentration of cobalt acetate solution. The MA results indicate that CACs with cobalt acetate solution concentration of 0.5 mol/L shows an excellent MA properties with ultrabroad bandwidth 8.5 GHz covering the whole K band (18–26.5 GHz). The excellent MA performance can be attributed to good impedance matching, multiple reflections, polarization processes, and the synergistic effects in the CACs. Therefore, our study paves a novel way to fabricate the promising lightweight MA materials with ultrabroad absorption bandwidth at higher frequency.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Xin Zhao,Dong-Mei Guo,Qing-Da An,Shu-Feng Bo,Zuo-Yi Xiao,Wei-Jie Cai,Hai-Song Wang,Shang-Ru Zhai,Zhong-Cheng Li
In order to solve the pollution of electromagnetic interference (EMI), hierarchical Co/N-co-doped carbonaceous compounds with absorption promoting nanostructures were prepared as absorbing materials via a seaweed-based hydrogel strategy. XRD , Raman, SEM, TEM, VSM and XPS were used to characterize the resultant samples. All the tests indicated that the absorber carbonized at 700 °C (SA/N-Co x O y -700, among, SA represents sodium alginate and 700 means that the carbonization temperature was 700 °C) has an excellent performance, which minimal RL can reach to −47.31 dB at 16.16 GHz and the effective absorption bandwidth (RL < -10 dB) is 4.56 GHz from 13.44 to 18 GHz. The relative superior performance is mainly attributed to the cooperative effect of nitrogen-doped carbon skeleton, expanded surface, multiple defects, various phase interface and hierarchal pore structures , thus leading to the improvement in multiple reflections and scattering, nature resonance, eddy-current effect, the consumption of thermal energy, dipoles and interfacial polarization.
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Russian Journal of Physical Chemistry A
·
2019
·Vol. 93
·期 11
·2256-2262
·
IF 0.581
Shibin Lu,Meng Ying,Yuan Jiangtao,Wang Feifei,Dai Yuehua,Chen Junning
Abstract The composites of porous Co 3 O 4 /MWCNTs and porous Co 3 O 4 /Co/RGO have been prepared by the wet chemical method and carbonization process. Due to well impedance matching characteristics, dielectric loss properties and highly porous structure Co 3 O 4 /Co/RGO composite displays extremely strong electromagnetic wave absorption with a maximum reflection loss of –54.2 dB at 13.14 GHz and the absorption bandwidth with the reflection loss exceeding –10 dB is 5.46 GHz (10.24–15.7 GHz) with the thickness of only 2.0 mm. Furthermore, the addition amount of the composite into paraffin matrix is merely 10 wt %, less than that of most EMW absorber reported previously. Therefore, Co 3 O 4 /Co/RGO composite can be used as a promising lightweight EMW absorbing material.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Jun Wang,Yao Cheng,Rui Peng,Qianling Cui,Yufeng Luo,Lidong Li
In recent years, molecularly imprinted polymer have attracted intensive interests owing to its abundant tailor-made recognition sites, which show high affinity and specificity toward template molecules. Herein, we reported the synthesis of paracetamol (PCM) imprinted fluorescent polymer nanoparticles through a simple co-precipitation method using commercial starting materials, followed by acidifying and washing steps to remove the templates. The fluorescence intensity of the obtained PCM imprinted nanoparticles could be quantitatively quenched by re-binding with PCM. Its efficient sensing behavior on PCM was demonstrated with a linear working range from 10 μM to 100 μM and a detection limit of 1 μM. Moreover, its accurate assay on PCM content in commercial tablets proved it a promising and reliable chemosensor for PCM sensing. Furthermore, the reported preparation only consists of co-precipitation and washing steps under mild conditions, which is a simple, cost-, time-, and energy-saving tactic to develop various kinds of molecularly imprinted polymer nanoparticles.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Shizong Wang,Jianlong Wang
High efficient and stable activator is desired for the sulfate radical-based wastewater treatment. Cobalt sulfide and cobalt oxide have high catalytic activity for peroxymonosulfate (PMS), but poor stability. Here, a novel composite, nano Co 9 S 8 and CoO encapsulated by nitrogen and sulfur co-doped sludge-derived biochar (CoO/Co 9 S 8 @N-S-BC) was synthesized, characterized and applied for activating PMS. The results showed that CoO/Co 9 S 8 @N-S-BC can effectively activate PMS for sulfamethoxazole (SMX) degradation, and 0.08 mM of SMX could be completely degraded within 10 min. The influencing factors, such as pH, temperature, chloridion, carbonate and humic acid were investigated. The SMX degradation conformed to pseudo first-order kinetics with rate constant of 0.379 min −1 . Sulfate radicals (dominant) and hydroxyl radicals contributed to SMX degradation. Carbon defects, pyridinic N, quaternary N, the carbon atoms next to pyridinic N, C O groups, -C-S-C and Co(II), all contributed to PMS activation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Zhirong Yang,Jing Zhang,Jiejie Huang,Gang Qian,Xuezhi Duan,Xinggui Zhou
To promote biomass-derived tar and coke upgrading, biomass pyrolysis intensification was utilized by the co-pyrolysis of biomass and caking coal with suitable particle size. The intensification led to a 15% increase in light tar fraction in tar, indicating a transformation from heavy tar to light components (phenols, aliphatic hydrocarbons). Moreover, the resulting coke achieved high strength (M25 > 80%) that can meet the requirement for moving bed gasification. To further facilitate tar upgrading and alleviate secondary reactions of volatiles that result in more secondary-coke and less gas, calcium-based Ca@Cu catalysts were synthesized and then loaded along the predicted coke cracks to improve tar quality without compromising coke granularity and strength. The results indicated that the catalytic upgrading mitigated the formation of pyrolytic water and secondary-coke, and dramatically improved tar quality as the light tar fraction in tar increased by 15–30%. Specifically, the upgraded light tar contains more phenols, naphthalenes, and anthracenes but less acids, ketones, and furfurals. It was postulated that selective cleavage of oxygen-containing functional groups (mainly ether bonds) promoted tar reconstruction to release more light aromatics during the catalysis. The coke strength continued to increase by 3–6%, possibly due to mitigation of H2O formation as indicated by more oxygen-containing groups retained in the aromatics during the Ca@Cu catalysis. The current study provided a new strategy to simultaneously upgrade coke and tar during catalytic pyrolysis of biomass for efficient utilization of the biomass.
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