JOURNAL OF MATERIALS SCIENCE
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2023
·Vol. 58
·期 17
·7441-7455
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IF 4.5
Wang Yijie,Li Qiulan,Xia Qinghai,Yang Yaling,Yang Dezhi
Sensitive and effective detection of xanthine oxidase (XOD) is essential for assessing human health. Herein, a dual-enzyme-based cascaded reaction system was developed for xanthine and xanthine oxidase assay based on the peroxidase (POD)-like catalytic activity of Fe 3 O 4 @MWCNTs/Hemin nanocomposite. The XOD could catalyze xanthine to produce H 2 O 2 , which is subsequently converted by Fe 3 O 4 @MWCNTs/Hemin into hydroxyl radicals (·OH) to oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a light blue. Notably, it is demonstrated that the modification of MWCNTs and Hemin could significantly enhance the POD-like activity from 9.78 × 10 −8 M s −1 ( V max value of Fe 3 O 4 ) to 23.34 10 −8 M s −1 ( V max value of Fe 3 O 4 @MWCNTs/Hemin), which makes the detection of xanthine oxidase more sensitive. By using the smartphone to capture the colorimetric signal of oxidized TMB (oxTMB), the assay can detect xanthine and XOD as low as 0.250 µM and 0.216 mU mL −1 , respectively. The reliability of the method in human serum suggested satisfactory spiked recoveries in the range of 92.350–105%. This work provided a new insight for Fe 3 O 4 -based nanozyme design and monitoring XOD level in blood. Graphical Abstract
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Ding Hongbo,Wang Jue,Zhou Jiang,Wang Chengxin,Lu Bingan
In nature, the human body is a perfect self-organizing and self-repairing system, with the skin protecting the internal organs and tissues from external damages. In this work, inspired by the human skin, we design a metal electrode skin (MES) to protect the metal interface. MES can increase the flatness of electrode and uniform the electric field distribution, inhibiting the growth of dendrites. In detail, an artificial film made of fluorinated graphene oxide serves as the first protection layer. At molecular level, fluorine is released and in-situ formed a robust SEI as the second protection “skin” for metal anode. As a result, Cu@MES | | K asymmetric cell is able to achieve an unprecedented cycle life (over 1600 cycles). More impressively, the full cell of K@MES | | Prussian blue exhibits a long cycle lifespan over 5000 cycles. This work illustrates a mechanism for metal electrode protection and provides a strategy for the applying bionics in batteries.
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Science China-Materials
·
2023
·Vol. 66
·期 7
·2843-2851
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IF 8.1
Xia Shan,Fu Wei,Liu Jiahao,Gao Guanghui
Ionic conductive hydrogels have emerged as one of the most promising alternatives to wearable sensors for human motion detecting, owing to their unique advantages in biocompatibility, conductivity and flexibility. However, the current hydrogel electronics still face the limitations of non-reusability and single-signal detection capability. Here, an ionic conductive hydrogel based on polyvinyl alcohol, sodium alginate fibers, and collagen was prepared by simulating the network structure and ion conduction mechanism of organisms for dual-mode signal acquisition of human motion and electrophysiological signals. Through the synergistic regulation of sodium alginate fibers and collagen, the hydrogels exhibit skin-like mechanical properties with low modulus, high toughness, and fatigue resistance to maximize the wearing comfort and motion detection capabilities of hydrogel wearable sensors. Furthermore, the hydrogel conductors with ion-transporting behavior close to organisms can be used as epidermal electrodes to collect the epidermis biopotential containing important human physiological information. As a result, through the rational design and assembly of wearable devices, hydrogels can be used to not only continuously and accurately identify whole-body motion signals, but also collect different electrophysiological signals such as electromyogram and electrocardiogram signals. Notably, the hydrogel based on the non-covalent cross-linked structure is completely recyclable, which can be arbitrarily reconstituted into new electronic devices while retaining the original function, improving the reusability of the hydrogels and reducing electronic waste.
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Biomass Conversion and Biorefinery
·
2023
·
IF 4
Du Peng,Chu Zhengkun,Zhang Jing,Ma Jieyu,Cao Feng,Liu Jie
With the increase of agricultural production, the utilization of biomass waste has become the focus of current research. In this study, Si-containing carbon dots (Si-CDs) were prepared from peanut shells by one-pot hydrothermal method. These Si-CDs exhibit peroxidase-like activity and can catalyze H 2 O 2 oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a chromogenic reaction, while cysteine (Cys) can reduce the oxidation product of TMB (ox-TMB) to discolor it. A method for the determination of Cys using Si-CDs as peroxidase was developed. In addition, the effect of environmental factors on the enzyme-like reaction was investigated. The experimental results showed that the best catalytic effect was achieved at pH = 2.5, reaction temperature of 60 °C, and reaction time of 55 min when the concentrations of TMB and H 2 O 2 were 5 mmol·L −1 and 2.75 mmol·L −1 , indicating that Si-CDs still have the potential for enzymatic activity in extreme environments. The decrease in absorbance of the system (ΔA) showed a good linear relationship with Cys in the range of 5–100 μmol·L −1 , and the limit of detection was 0.037 μmol·L −1 . This sensor was successfully used for the determination of edible Cys content.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 12
·2163-2172
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IF 4.3
Zhang Haotian,Wang Xiaohong,Xu Zuhui,Ma Jimei,Li Zi-Long,Cheng Wan-Min,Jiang Hong
Salmonella enteritidis is one of the most common foodborne pathogens. Many methods have been developed to detect Salmonella , but most of them are expensive, time-consuming, and complex in experimental procedures. Developing a rapid, specific, cost-effective, and sensitive detection method is still demanded. In this work, a practical detection method is presented using salicylaldazine caprylate as the fluorescent probe, which could be hydrolyzed by caprylate esterase liberated from Salmonella lysed by phage, to form strong fluorescent salicylaldazine. The Salmonella could be detected accurately with a low limit of detection of 6 CFU/mL and a broad concentration range of 10–10 6 CFU/mL. Moreover, this method was successfully used for the rapid detection of Salmonella in milk within 2 h through pre-enrichment by ampicillin-conjugated magnetic beads. The novel combination of fluorescent turn-on probe salicylaldazine caprylate and phage ensures this method has excellent sensitivity and selectivity. Graphical Abstract
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Nano Research
·
2023
·Vol. 16
·期 7
·8827-8835
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IF 9.9
Wang Xin,Miao Ming,Tang Bowen,Duan Haotian,Zhu Fulong,Zhang Huigang,Zhang Xian,Yin Wen-jin,Fu Yongzhu
Electrochemical conversion of CO 2 (CO 2 RR) into high-value fuel is identified as one of the promising approaches to achieve carbon neutrality. The synthesis of high-efficiency CO 2 reduction electrocatalysts with high C 2 :C 1 , selectivity remains a field of intense interest. Previous studies have shown that the presence of Cu(I) is beneficial for the reduction of CO 2 into C 2 products. However, the stable presence of Cu(I) remains controversial, especially in the negative potential window. Here we report a simple and easily scalable catalyst precursor Cu 2 (OH) 3 Cl/C, which automatically forms in-situ chlorine-doped Cu/Cu 2 O heterointerface during electrocatalysis. The catalyst not only exhibits a Faradaic efficiency of 33.03% but also provides a long-term stability of Cu + , gaining a stable electrolysis of 11 h, with an ethylene/methane ratio over 50. The experimental results and mechanistic studies confirm that the presence of Cl − inhibits the reduction of Cu + , inducing the formation of Cu 0 /Cu + , and reduces the reaction energy of the intermediate ⋆CO dimerization, thereby facilitating the formation of C 2 products. This work provides a feasible way to synthesize copper ions with long-term and stable positive charge in CO 2 RR and expands a new way to synthesize ethylene industrial products in the future.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 18
·53355-53369
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IF 5.8
Ding Chunsheng,Lei Jia,Cai Zhiyue,Gao Mengying,Zou Zhaozheng,Li Yuanfeng,Deng Jing
In this research, FeCo 2 O 4 nanomaterial was successfully synthesized by a typical sol–gel method and conducted as an effective agent for peroxymonosulfate (PMS) activation to eliminate antibiotics flurbiprofen (FLU), a strong nonsteroidal drug. FeCo 2 O 4 nanomaterial was characterized by XRD, TEM, SEM, and XPS. Various characterization results proved that FeCo 2 O 4 held stable spinel structure. The interfering factors including initial pH, PMS concentration, catalyst dosage, inorganic anions, and humic acid on FLU removal were also discussed. The conclusion was that the removal efficiency of FLU reached 98.2% within 120 min after adding FeCo 2 O 4 (0.4 g L −1 ) and PMS (3 mM). The optimal pH for FLU degradation was the initial pH of 6.5; too acidic or alkaline was not conductive to the degradation. The existence of HA and Cl − restrained the degradation of FLU, and HCO 3 − promoted the removal, while the influence of NO 3 − and SO 4 2− could not be considered. The radical scavenging experiment confirmed that • OH, O 2 •− , and SO 4 •− participated in FLU removal and SO 4 •− functioned a leading role. FeCo 2 O 4 showed high efficiency for PMS activation in pH range of 3.0 to 10.0. After the fourth cycle operation, the FLU removal rate exceeded 76.9%, and the Co leaching rate was low during the catalytic reaction. This study shows that FeCo 2 O 4 nanomaterial is an efficient and environment-friendly catalyst, which can be applied for PMS activation to remove organic pollutants in water.
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Journal of Coatings Technology and Research
·
2023
·Vol. 20
·期 5
·1579-1594
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IF 2.3
Lin Ruijun,Yin Xingshan,Liu Huameng,Chen Lijing,Wu Jianxin,Liu Liang,Gu Yuxin,Li Yong,Lin Xiaofeng,Lin Wenjing,Yi Guobin
Self-matting acrylate has attracted much interest due to excellent weather resistance, hardness, water resistance, and chemical resistance. However, the poor mechanical properties of acrylate limit its application in coatings. To overcome this problem, a series of self-matting acrylate emulsions (SMAE) modified by xylitol-based hyperbranched urethane acrylate (HP-IH) were successfully synthesized. The results revealed that the amount of emulsifier was the primary factor affecting the gloss of the films. Upon the incorporation of HP-IH, the elongation at break and fracture energy of the SMAE films were significantly improved by 52.6% and 59.6%, respectively, due to the internal plastic effect and increased crosslink density induced by HP-IH. The S-2-1.5 sample exhibited the excellent comprehensive performance, i.e., tensile strength of 12.7 MPa, elongation at break of 952%, fracture energy of 71.1 MJ/m 3 , adhesion of 5B, temperature of 5% weight loss at 350 °C, and gloss at 60° of 14.8, respectively, indicating its great application potential in the field of low-gloss coatings.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 14
·2775-2780
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IF 4.3
Jin Shanxia,Li Yaqin,Yang Liuquan,Li Wei,Zhou Ping
The affinity interactions between boronic acids and sugars have been successfully exploited in many fields, such as the sensing of saccharides, selective enrichment of glycoconjugates, and drug delivery. However, despite multiple techniques having been adopted to investigate the reaction of boronate affinity, the pathway of boronate esters formation under aqueous conditions remains controversial. We report a MALDI-MS approach to investigate the interactions between phenylboronic acid and monosaccharides in neutral aqueous solution by using polylevodopa as an innovative substrate instead of conventional matrix. A series of unusual tri-benzeneboronic esters were then revealed. The mass spectrometry data indicate that they bear a dibenzenepyroboronate cyclic ester moiety with seven-membered ring or eight-membered ring. With the aid of theoretical computations, their most likely geometrical structures are elucidated, and these tri-benzeneboronic esters are proposed to be formed via a boroxine binding monosaccharide pathway. This work provides more insight into the mechanism of boronate affinity interaction between boronic acid and sugars and proves the developed MALDI-MS approach is promising for studying interactions between small molecules. Graphical Abstract
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Nano Research
·
2023
·Vol. 16
·期 6
·8497-8503
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IF 9.9
Zou Jian,Wu Zhenrui,Tang Ruilin,Ren Zhenzhen,Niu Xiaobin,Wang Liping
Copper sulfide (CuS) is a promising cathode for lithium-ion batteries (LIBs) due to its impeccable theoretical energy density (∼ 1015 Wh·kg −1 and 4743 Wh·L −1 ). However, it suffers from voltage decay leaded energy density loss and low energy efficiency, which hinders its application. In this work, with combined ex-situlin-situ X-ray diffraction (XRD) and electrochemical analysis, we explore detailed degradation mechanisms. For the voltage decay, it is attributed to a spontaneous reaction between CuS cathode and copper current collector (Cu CC). This reaction leads to energy density loss and active materials degradation (CuS → Cu 1.81 S). As for energy efficiency, CuS undergoes a series of phase transformations. The main phase transition processes are CuS → α -LiCuS → Li 2− x Cu x S + Cu → Li 2 S + Cu for discharge; Li 2 S + Cu → Li 2− x Cu x S → β -LiCuS → CuS for charge. Here, α -LiCuS, β -LiCuS, and Li 2− x Cu x S are newly identified phases. These phase changes are driven by topotactic-reaction-related copper diffusion and rearrangement. This work demonstrates the significance of transition-metal diffusion in the intermediates formation and phase change in conversion-type materials.
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POLYMER BULLETIN
·
2023
·
IF 3.2
Mei Li,Lixian Zhou,Jialin Yu,Zihan Zhu,Jiaqi Lin,Yufu Li,Kancheng Mai
To enhance antimicrobial resistance of ZnO-based polymer materials, ZnO supported diatomite (DZ) was prepared and characterized by SEM, XPS, BET and inhibition zone method. The antimicrobial resistance, thermal decomposition, crystallization characteristics and mechanical properties of DZ and nano-ZnO filled polylactic acid (PLA)/poly(butylene adipate- co -terephthalate) [PBAT] composites were compared by tablet counting method, thermogravimetric analysis, differential scanning calorimetry and mechanical testing. The antimicrobial resistance of DZ filled PLA/PBAT composites was higher that of nano-ZnO filled PLA/PBAT composites, indicating higher antimicrobial resistance of DZ than that of nano-ZnO. The thermal decomposition temperature of DZ filled PLA/PBAT composites was much stable than that of nano-ZnO filled PLA/PBAT composites. Meanwhile, crystallization properties of DZ filled PLA/PBAT composites had little effect. But the nano-ZnO distinctly decreased the mechanical properties of PLA/PBAT composites. Loading on diatomite with ZnO can effectively improve the antibacterial properties and thermal stability of ZnO filled PLA/PBAT composites.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-8
·
IF 16.6
Fang Zizheng,Shi Yunpeng,Mu Hongfeng,Lu Runzhi,Wu Jingjun,Xie Tao
Delicate geometries and suitable mechanical properties are essential for device applications of polymer materials. 3D printing offers unprecedented versatility, but the geometries and mechanical properties are typically fixed after printing. Here, we report a 3D photo-printable dynamic covalent network that can undergo two independently controllable bond exchange reactions, allowing reprogramming the geometry and mechanical properties after printing. Specifically, the network is designed to contain hindered urea bonds and pendant hydroxyl groups. The homolytic exchange between hindered urea bonds allows reconfiguring the printed shape without affecting the network topology and mechanical properties. Under different conditions, the hindered urea bonds are transformed into urethane bonds via exchange reactions with hydroxyl groups, which permits tailoring of the mechanical properties. The freedom to reprogram the shape and properties in an on-demand fashion offers the opportunity to produce multiple 3D printed products from one single printing step.
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