Nature Communications
·
2023
·Vol. 14
·期 1
·1-14
·
IF 16.6
Tang Xiaoduo,Ren Jingyan,Wei Xin,Wang Tao,Li Haiqiu,Sun Yihan,Liu Yang,Chi Mingli,Zhu Shoujun,Lu Laijin,Zhang Junhu,Yang Bai
Autologous skin flap transplantation is a common method for repairing complex soft tissue defects caused by cancer, trauma, and congenital malformations. Limited blood supply range and post-transplantation ischemia-reperfusion injury can lead to distal necrosis of the flap and long-term functional loss, which severely restricts the decision-making regarding the optimal surgical plan. To address this issue, we develop a hydrogel patch that releases carbon monoxide and nitric oxide gases on demand, to afford a timely blood supply for skin flap transplantation during surgery. Using an ischemia-reperfusion dorsal skin flap model in rats, we show that the hydrogel patch maintains the immediate opening of blood flow channels in transplanted tissue and effective blood perfusion throughout the perioperative period, activating perfusion of the hemodynamic donor site. We demonstrate that the hydrogel patch promotes distal vascularization and long-term functional reconstruction of transplanted tissues by inhibiting inflammatory damage and accelerating blood vessel formation.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 9
·1-11
·
IF 5.7
Liu Yujie,Gao Ran,Liu Xingcen,Zheng Jinhua,Wu Xia
Curcumin (Cur) possesses diverse biological and pharmacologic effects. It is widely used as a food additive and therapeutic medicine. A study to determine a sensitive detection method for Cur is necessary and meaningful. In this work, double rare earth ions co-doped fluorescent coordination polymer nanoparticles (CPNPs) were developed for the Cur detection. The CPNPs were synthesized by using adenosine monophosphate (AMP) as bridge ligands via coordination self-assembly with Ce 3+ and Tb 3+ . The AMP-Ce/Tb CPNPs exhibited the characteristic green fluorescence of Tb 3+ and had high luminescence efficiency. Under the optimal conditions, the fluorescence intensity of AMP-Ce/Tb CPNPs could be significantly quenched by Cur. The fluorescence quenching extent at λ ex / λ em of 300 nm/544 nm showed a good linear relationship with the Cur concentration in the range of 10 to 1000 nM. The detection limit was as low as 8.0 nM ( S/N = 3). This method was successfully applied to the determination of Cur in real samples with satisfactory results. The luminescence mechanism of AMP-Ce/Tb CPNPs and the fluorescence quenching mechanism of the CPNPs by Cur were both examined. Graphical abstract
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 38
·e54441
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IF 3
Yunxiao Dong,Yong Yang,Jinggang Wang,Qianfeng Wang,Xiaoqin Zhang,Han Hu,Jin Zhu
In this work, we prepared a series of bio-based poly(butylene adipate- co -furandicarboxylate) (PBAF) copolyesters with BF segments ranging from 20 to 80 mol% through a two-step polycondensation. Then, their thermal, mechanical, gas barrier, and degradable properties were investigated. With the increase of BF content, the glass transition temperatures ( T g ) and melting temperatures ( T m ) of PBAFs increase constantly. Besides, PBAF copolyesters exhibit excellent mechanical performance with elongation at break in the range of 140% to 870%. The elastic modulus and tensile strength of PBAF60 are 138 and 17 MPa respectively, which are comparable to those of commercial poly(butylene adipate- co -terephthalate) (PBAT). Moreover, thanks to the structural characteristics of the furan ring, the barrier performances against CO 2 , O 2 , and H 2 O of PBAFs are 4.6–147.5 folds, 4.0–76.0 folds, and 0.8–8.7 folds of PBAT, respectively. Finally, the degradation tests reveal that the weight losses of PBAFs increase with decreasing BF contents. It is worth emphasizing that although the compost degradation rate of PBAF60 is slightly lower than that of PBAT, it is still a prospective alternative to PBAT due to its improved barrier properties. And it provides a possibility for applications in food packaging, mulch films, and structural elements.
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COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 301
·期 8
·957-966
·
IF 2.4
Liao Wenbo,Wu Weicai,Zhong Guoyu,Ye Lingyun,Zheng Shaona
A novel procedure for the preparation of superhydrophilic poly(styrene-co-acrylate)/SiO 2 composite materials was prepared from conventional emulsion polymerization in the presence of colloidal silica. TEM photos revealed that poly(styrene-co-acrylate) latexes exhibited a clear core–shell structure, and the electrostatic repulsion and hydrogen bonds between poly(styrene-co-acrylate) latexes and SiO 2 nanoparticles guaranteed the uniform dispersion of silica nanoparticles. The average diameter data indicated that the particle size of composite latexes (78 nm) was slightly smaller than that of polymer (82 nm), although the slight aggregation of SiO 2 nanoparticles had increased the average diameter to 87 nm. FTIR spectra confirmed that hydrogen bonds were formed and gel reaction of –OH groups occurred during film formation. Two kinds of Si–O bonds were found in XPS spectra with a weight ratio addition of 20.0% SiO 2 , which one was related to the Si–OH groups of colloidal silica nanoparticles, while the other was attributed to the Si–O-Si groups obtained from the gel reaction. SEM and AFM images displayed that the formation of micro/nano structure from the gel reaction had increased the roughness of the composite films. The water contact angle (WCA) of the composite films was found to decrease from 45 to 3º (3 s) and exhibit superhydrophilicity. Graphical abstract
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Journal of Energy Chemistry
·
2023
·
IF 13.1
Hua-Qing Yin,Zuo-Shu Sun,Qiu-Ping Zhao,Lu-Lu Yang,Tong-Bu Lu,Zhi-Ming Zhang
Traditional urea synthesis under harsh conditions is usually associated with high energy input and has aroused severe environmental concerns. Electrocatalytic C–N coupling by converting nitrate and CO 2 into urea under ambient conditions represents a promising alternative process. But it was still limited by the strong competition between nitrate electrochemical reduction (NO 3 ER) and CO 2 electrochemical reduction (CO 2 ER). Here, Fe II -Fe III OOH@BiVO 4 - n heterostructures are constructed through hydrothermal synthesis and exhibited superior performance toward urea electrosynthesis with NO 3 − and CO 2 as feedstocks. The optimized urea yield and Faradaic efficiency over Fe II -Fe III OOH@BiVO 4 -2 can reach 13.8 mmol h −1 g −1 and 11.5% at −0.8 V vs. reversible hydrogen electrode, which is much higher than that of bare FeOOH (3.2 mmol h −1 g −1 and 1.3%), pristine BiVO 4 (2.0 mmol h −1 g −1 and 5.4%), and the other Fe II -Fe III OOH@BiVO 4 - n ( n = 1, 3, 5) heterostructures. Systematic experiments have verified that BiVO 4 and FeOOH are subreaction active sites towards simultaneous CO 2 ER and NO 3 ER, respectively, achieving co-activation of CO 2 and NO 3 − on Fe II -Fe III OOH@BiVO 4 -2. Moreover, the urea synthesis via the *CO and NO* intermediates and C–N coupling was confirmed by the in situ Fourier transform infrared spectroscopy. This work not only alleviates the CO 2 emission and nitrate pollution but also presents an efficient catalyst for synergistic catalysis towards sustainable urea synthesis.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Shujie Liang,Xiaohui Zhong,Zuqi Zhong,Hong Deng,Wai-Yeung Wong
Photoconversion of CO 2 into value-added fuels has aroused widespread interest; however, this process is significantly limited by the inefficient thermodynamics and sluggish reaction dynamics in the diluted CO 2 . To circumvent these obstacles, we design a bipyridine-based polyimide polymer for anchoring single Ni site for diluted CO 2 photoreduction. The desired Ni single atomic catalysts achieve high generation activity of ∼ 2262 μmol/h with apparent quantum efficiency (A.Q.E.) of 0.20% for CO 2 -to-CO in 0.1 atm CO 2 pressure. No measurable H 2 is produced in the catalytic process, affording nearly 100% CO selectivity over water splitting. This superior activity and selectivity outperform most previous atomical catalysts. Mechanistic analyses elucidate that the highly dispersed Ni atoms act as active sites for effective CO 2 binding and activation, and stabilize the rate-determining step of intermediates for CO generation. This work discloses the relationship between catalytic properties and single atoms for efficient solar-driven diluted CO 2 reduction.
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ChemistrySelect
·
2023
·Vol. 8
·期 18
·e202204645
·
IF 2.1
Yingzi Huang,Xue Ye,Xinhua Gao,Lisheng Guo,Yaqiong Wang,Wenlin Xu,Jie Li
Graphical A hollow microcage structured CoMn- x catalyst was synthesized by the template method. In which abundant CO 3+ as well as surface reactive oxygen species on the surface of the CoMn-2 catalyst enabled it to exhibit extremely high catalytic activity for CO under space velocity 36,000 mL g cat −1 h −1 , being able to completely eliminate CO at 80 °C and maintain stable catalytic activity for up to 100 h. Cost-effective and highly efficient catalyst is a promising way for the removal of CO in automotive exhaust purification. Herein, a series of novel self-assembled CoMn bimetallic catalysts with hollow microcage structure have been prepared through zeolitic imidazole framework (ZIF-67) assisted method followed by direct pyrolysis in static air. Both the Mn loading and the unique hollow microcage structure play important roles in CO low-temperature oxidation, and the highest catalytic activity is obtained for CoMn-2 catalyst, which presents T 100 (temperature of 100 % CO conversion) at 80 °C. Through a systematic series of experiments, we further demonstrate that our catalysts’ superior catalytic performance arises from small particle size, high surface active oxygen content and Co 3+ /(Co 2+ +Co 3+ ) ratio. Such configuration of catalysts will pave the way for new strategies to design noble-free high-performance catalysts for CO low-temperature oxidation.
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Nanomaterials
·
2021
·Vol. 12
·期 1
·41
·
IF 5.076
Tong Yu,Chenpu Wu,Zhongyan Chen,Mingen Zhang,Zhuan Hong,Honghui Guo,Wenyao Shao,Quanling Xie
In this study, a novel photocatalytic self-cleaning nanofiltration (NF) membrane was fabricated by constructing aspartic acid-functionalized graphene quantum dots (AGQDs) into the polydopamine/polyethyleneimine (PDA/PEI) selective layer via the co-deposition method. The chemical composition, microstructure, and hydrophilicity of the prepared membranes were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), attenuated total reflection (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), and water contact angle (WCA). Meanwhile, the effects of PEI molecular weight and AGQDs concentration on NF membrane structures and separation performance were systematically investigated. The photocatalytic self-cleaning performance of the PDA/PEI/AGQDs membrane was evaluated in terms of flux recovery rate. For constructing high-performance NF membranes, it is found that the optimal molecular weight of PEI is 10,000 Da, and the optimal concentration of AGQDs is 2000 ppm. The introduction of hydrophilic AGQDs formed a more hydrophilic and dense selective layer during the co-deposition process. Compared with the PDA/PEI membrane, the engineered PDA/PEI/AGQDs NF membrane has enhanced water flux (55.5 LMH·bar−1) and higher rejection (99.7 ± 0.3% for MB). In addition, the PDA/PEI/AGQDs membrane exhibits better photocatalytic self-cleaning performance over the PDA/PEI membrane (83% vs. 69%). Therefore, this study provides a facile approach to construct a self-cleaning NF membrane.Keywords:nanofiltration;graphene quantum dots;L-aspartic acid;self-cleaning;co-deposition
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Acta Pharmaceutica Sinica B
·
2021
·
IF 11.614
Yang Zhou,Fan Tong,Weilong Gu,Siqin He,Xiaotong Yang,Jiamei Li,Yue-Dong Gao,Huile Gao
Considering that photodynamic therapy (PDT)-induced oxygen consumption and microvascular damage could exacerbate hypoxia to drive more glycolysis and angiogenesis, a novel approach to potentiate PDT and overcome the resistances of hypoxia is avidly needed. Herein, morpholine-modified PEGylated bilirubin was proposed to co-deliver chlorin e6, a photosensitizer, and diclofenac (Dc). In acidic milieu, the presence of morpholine could enable the nanocarriers to selectively accumulate in tumor cells, while PDT-generated reactive oxidative species (ROS) resulted in the collapse of bilirubin nanoparticles and rapid release of Dc. Combining with Dc showed a higher rate of apoptosis over PDT alone and simultaneously triggered a domino effect, including blocking the activity and expression of lactate dehydrogenase A (LDHA), interfering with lactate secretion, suppressing the activation of various angiogenic factors and thus obviating hypoxia-induced resistance-glycolysis and angiogenesis. In addition, inhibition of hypoxia-inducible factor-1 α (HIF-1 α ) by Dc alleviated hypoxia-induced resistance. This study offered a sequentially responsive platform to achieve sufficient tumor enrichment, on-demand drug release and superior anti-tumor outcomes in vitro and in vivo .
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Yanjie Duan,Zhixiong Huang,Xiangbin Dong,Jingyu Ren,Lin Lin,Shuhong Wu,Runping Jia,Xiaowei Xu
Transition metal oxalates have attracted people's attention owing to their low cost, low lithium insertion potential and high theoretical reversible capacities. Disappointingly, high irreversible capacity thanks to the formation of SEI as well as the consumption and exfoliation of active materials during the process of cycling severely restrict its application of it. In this work, a comprehensive evaluation of Co, Ni, Cu and Zn doped manganese oxalate was made. All samples are synthesized via facile and time-saving microwave hydrothermal method . It is intriguing that merely 30 min is required to accomplish the entire process and all samples possess fine electrochemical performance. As far as the four bimetallic oxalates, the resulting Mn 0·5 Ni 0·5 C 2 O 4 exhibits the optimum performance (746.2 mA h g −1 after 100 cycles at 0.2 A g −1 and 546.7 mA h g −1 at 1 A g −1 after 400 cycles), which can be attributed to one-dimensional rod-like morphology of Mn 0·5 Ni 0·5 C 2 O 4 as well as the synergistic and catalytic effect of Mn and Ni, resulting in faster electrode kinetics . Mn 0.5 Ni 0.5 C 2 O 4 displays incalculable potential and can be applied in the highly reversible lithium-ion batteries.
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JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Xiangsi Wu,Chunlei Tan,Caimei He,Tong Zhao,Xianwen Wu,Zhaoling Ma,Hongqiang Wang,Yezheng Cai,Qiang Wu,Qingyu Li
Electrocatalyst is the pivotal component promoting the kinetics of oxygen reduction reaction in aqueous metal-air batteries . However, the content of increased bond as the active species is usually limited by the metal loading, tiny pore canal, insufficient nitrogen further restraining the electrocatalytic effectiveness of single-atom catalysts in oxygen reduction reaction (ORR). Herein, Co, N-dual doped carbon (Co/NNC) is prepared by a versatile strategy of the combination approach of SiO 2 template with extra nitrogen source. Based on ZIF-67 prepared with the assistance of SiO 2 template, the extra nitrogen source was introduced in the high-temperature pyrolysis procedure. The material characterizations of XRD , SEM, HRTEM , BET, Raman and XPS are conducted to synthetically analyze the functional role of extra nitrogen source. Moreover, the Co/NNC with increased Co-N x active sites is employed into two aqueous metal-air batteries of Zn-air and Mg-air batteries, which exhibits excellent performances especially in the aspects of discharge specific capacity, discharge stability and power density.
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Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 134
·期 2
·823-835
·
IF 2.081
Wang Ying,He Runfa,Wang Cong,Li Gang
A kind of heterogeneous catalyst MCM-41-S-ImBr was prepared by grafting 1-vinyl-3-ethylimidazolium bromide ([VEIM]Br) on the surface of MCM-41. The catalyst was characterized by X-ray diffraction patterns, Fourier transform infrared spectroscopy and element analysis as well as scanning electron microscopy. It showed that [VEIM]Br was successfully grafted on MCM-41 and the catalyst possessed an average particle size of 1.4 µm with intact mesoporous structure. Moreover, the catalyst exhibited high catalytic activity in the cycloaddition reaction of CO 2 with epichlorohydrin without co-catalyst. The conversion of epichlorohydrin was 98.5% and the selectivity of cyclic carbonate was 98.3% at 130 °C under 1.6 MPa for 6 h. Reaction kinetic study indicated that the pseudo-first order rate constant was 0.223 ± 0.001 h −1 . It is proved that MCM-41-S-ImBr could be used at least 4 times without obvious decrease in catalytic performance. A possible reaction mechanism was also proposed: the quaternary imidazolium ion cooperatively worked with the bromide ion to catalyze the reaction. Graphical Abstract
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