MICROCHIMICA ACTA
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2022
·Vol. 189
·期 6
·1-9
·
IF 6.408
Gao Hongfei,Cui Dandan,Zhai Shanshan,Yang Yao,Wu Yuhua,Yan Xiaohong,Wu Gang
A label-free electrochemical impedimetric biosensor was constructed based on gold carbon dots (GCDs) modified screen-printed carbon electrode for the detection of genetic modified (GM) soybean. The structure and property of GCDs were investigated. The GCDs can directly bind to single-stranded DNA probes through Au-thiol interaction and boost electric conductivity for the DNA sensor construction. The quantification of target DNA was monitored by the change of electron-transfer resistance ( R et ) upon the DNA hybridization on sensor surface. Under the optimal conditions, the R et response (vs. Ag reference electrode) increased with the logarithm of target DNA concentrations in a wide linear range of 1.0 × 10 −7 − 1.0 × 10 −13 M with a detection limit of 3.1 × 10 −14 M ( S / N = 3). It was also demonstrated that the proposed DNA sensor possessed high specificity for discriminating target DNA from mismatched sequences. Moreover, the developed biosensor was applied to detect SHZD32-1 in actual samples, and the results showed a good consistency with those obtained from the gel electrophoresis method. Compared with the previous reports for DNA detection, the label-free biosensor showed a comparatively simple platform due to elimination of complicated DNA labeling. Therefore, the proposed method showed great potential to be an alternative device for simple, sensitive, specific, and portable DNA sensor. Graphical abstract
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Frontiers of Optoelectronics
·
2022
·Vol. 15
·期 1
·1-10
·
IF 0
Jiang Mengjia,Li Shuyu,Zhen Chun,Wang Lingsong,Li Fei,Zhang Yihan,Dong Weibing,Zhang Xiaotao,Hu Wenping
Simultaneously realizing the optical and electrical properties of organic materials is always challenging. Herein, a convenient and promising strategy for designing organic materials with integrated optoelectronic properties based on cocrystal engineering has been put forward. By selecting the fluorene (Flu) and the 7,7′,8,8′-tetracyanoquinodimethane (TCNQ) as functional constituents, the Flu-TCNQ cocrystal prepared shows deep red emission at 702 nm, which is comparable to the commercialized red quantum dot. The highest electron mobility of organic field-effect transistor (OFET) based on Flu-TCNQ is 0.32 cm 2 V −1 s −1 . Spectroscopic analysis indicates that the intermolecular driving force contributing to the co-assembly of Flu-TCNQ is mainly charge transfer (CT) interaction, which leads to its different optoelectronic properties from constituents. Graphical Abstract
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Journal of Inorganic and Organometallic Polymers and Materials
·
2022
·Vol. 32
·期 7
·2473-2481
·
IF 3.518
Chen Lei,Li Yan,Sun Ping,Chen Hualin,Li He,Liu Jun,Chen Ziyue,Wang Bin
It is of great meaning to develop a facile, reliable and sensitive method to detect copper ions in water. In the study, a facile method has been developed for rapid and sensitive detection of Cu 2+ . An interesting phenomenon has been observed that 3,3′,5,5′-tetramethylbenzidine (TMB) ethanol solution can be extremely fast passed from colorless to yellow once Cu 2+ ions are added. It easily occurs to us that Cu 2+ can be quantitatively determined via the absorbance at 904 nm of the color changed TMB solution. More importantly, some specific anions (Cl − , Br − ) can significantly enhance the absorption intensity. Under the optimized experimental conditions, this method exhibits a good linear response range for Cu 2+ from 0.5 to 100 μM, with the detection limit of 93 nM. Moreover, the possible detection principle has been explored. It is worth mentioning that the color change can be clearly observed by naked eyes for the detection of 1 μM Cu 2+ , which is far below the threshold limit of Cu 2+ in drinking water suggested by World Health Organization. It means that this method possess great promise for on-site Cu 2+ detection.
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Science China-Materials
·
2022
·Vol. 65
·期 10
·2675-2684
·
IF 8.64
Wei Yue,Xu Gao,Wei Yujie,Ji Lvlv,Wang Tao,Liu Zhun,Wang Sheng
Developing highly efficient, cost-effective, and stable electrocatalysts for hydrogen evolution reaction (HER) is of considerable importance but remains challenging. Herein, we report the fabrication of a robust Ru-based electrocatalyst, which comprises heterostructured Ru-Ru 2 P nanoparticles that are embedded in the N,P-codoped carbon nanofibers (CNFs), through a synthetic strategy involving electrospinning and temperature-controlled pyrolysis treatment. The as-prepared Ru-Ru 2 P catalyst (Ru-Ru 2 P@CNFs) shows excellent HER catalytic activities with low overpotentials of 11 and 14 mV in acidic and alkaline media, respectively, to achieve a current density of 10 mA cm −2 , which are superior to the individual components of pure Ru and Ru 2 P catalysts. Density functional theory calculations demonstrate the existence of electronic coupling effect between Ru and Ru 2 P at the heterointerfaces, leading to a well-modulated electronic structure with optimized hydrogen adsorption strength and enhanced electrical conductivity for efficient HER electrocatalysis. In addition, the overall synthetic strategy can be generalized for the synthesis of a series of transitional metal phosphide-based nanofibers, thereby holding a remarkable capacity for various potential applications.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-8
·
IF 17.694
Xu Jie,Shao Gonglei,Tang Xuan,Lv Fang,Xiang Haiyan,Jing Changfei,Liu Song,Dai Sheng,Li Yanguang,Luo Jun,Zhou Zhen
Defect engineering is an effective strategy to improve the activity of two-dimensional molybdenum disulfide base planes toward electrocatalytic hydrogen evolution reaction. Here, we report a Frenkel-defected monolayer MoS 2 catalyst, in which a fraction of Mo atoms in MoS 2 spontaneously leave their places in the lattice, creating vacancies and becoming interstitials by lodging in nearby locations. Unique charge distributions are introduced in the MoS 2 surface planes, and those interstitial Mo atoms are more conducive to H adsorption, thus greatly promoting the HER activity of monolayer MoS 2 base planes. At the current density of 10 mA cm −2 , the optimal Frenkel-defected monolayer MoS 2 exhibits a lower overpotential (164 mV) than either pristine monolayer MoS 2 surface plane (358 mV) or Pt-single-atom doped MoS 2 (211 mV). This work provides insights into the structure-property relationship of point-defected MoS 2 and highlights the advantages of Frenkel defects in tuning the catalytic performance of MoS 2 materials.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 13
·6963-6970
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IF 4.682
Lu Haitao,Shi Huili,Sathasivam Sanjayan,Zhang Xia
In this work, multiwalled carbon nanotubes (modified MWCNTs) were modified by stearic acid and then added to silicone for the fabrication of C/silicone composite monolith materials. The obtained C/silicone monolith demonstrates strong robust superhydrophobicity after Taber abrasion, stretching, bending, twisting, high external pressure and knife scratching. The elongation rate and tensile strength of C/silicone were also increased by approximately 172% and 300%, respectively, compared with those of pristine silicone. In addition, the introduction of carbon nanotubes endows the composite materials with superior photothermal conversion performances, correspondingly presenting outstanding anti-icing and accelerated deicing effects, which can greatly reduce the heat loss of photothermal materials in practical applications. Importantly, the whole fabrication process would not include any fluorinated polymers so that the materials can be considered to be potentially safe and environment friendly.
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ECOTOXICOLOGY
·
2022
·Vol. 31
·期 5
·735-745
·
IF 2.935
Wei Xinrong,Li Xiao,Liu Hongsong,Lei Haojun,Sun Weijun,Li Dan,Dong Wu,Chen Hongxing,Xie Lingtian
Cadmium (Cd) is a non-essential element and can be toxic to aquatic organisms at low concentrations. Despite its well-known toxicity to Daphnia magna , the effects of Cd on physiological parameters (heart rate and thoracic limb activity) and molting- and reproduction-related genes are relatively understudied. In this study, D. magna were exposed to 0 (control), 25, 50 and 75 μg L −1 of Cd for 7 d and 21 d to determine the toxicity of Cd. The results showed that the Cd body burden in D. magna was significantly increased with elevated Cd concentrations, up to 13.4 μg Cd/g dry weight (dw) after exposure to 75 μg L −1 for 21 d. After 21 d of exposure, the body length and body weight of D. magna were significantly decreased in all Cd treatments compared to the control. The heart rate and thoracic limb activity were reduced by 4.3–11.7 and 5.0–10.3%, respectively. The levels of malondialdehyde (MDA) were increased by ~24–37% and the activity of catalase (CAT) was inhibited by ~50% compared to the control. The reproductive parameters (i.e., size of the first brood, the total number of offspring per female and the number of offspring per brood) were remarkably reduced, causing adverse effects on the population dynamics. In addition, the transcripts of genes ( cyp314 , cyp18a1 , ecra , usp , hr3 , cut , cht and cht3 ) related to the molting of D. magna were altered, whereas the transcripts of genes ( vtg1 , vtg2 and vmo1 ) related to reproduction were down-regulated. This study helps better understand the effects of Cd at different biological levels.
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Journal of Coatings Technology and Research
·
2022
·Vol. 19
·期 4
·1233-1241
·
IF 2.339
Wang Tian-Yu,Yang Wei,Hui Hao-Hao,Lei Xiang-Yang,Zhang Qing-Hua,Wang Jian,Xu Qiao,Deng Xue-Ran
The sol–gel method is an important process for the preparation of laser frequency conversion components, such as dihydrogen phosphate (KDP), which are often employed in high-power laser facility. Methyltriethoxysilane (MTS) precursor is a typical matrix to prepare polysiloxane under hydrolysis and polycondensation process. Further coating and curing procedure is applied to obtain desired polysiloxane coating which acts as the moisture-proof and refractive index matching layer. Subsequently, an antireflective coating is prepared over this polysiloxane coating (a bilayer coating system) to realize ultrahigh transmission at desired wavelengths. Due to the low curing temperature (limited by the phase transition temperature of KDP), current MTS-polysiloxane coating could not be completely cured and inter-coating permeation between this bilayer coating system would lead to deterioration of coating properties. Thus, copolymerization of MTS and tetraethylorthosilicate (TEOS) is adopted to fabricate the polysiloxane coating with improved curing property (denser structure and higher hardness after curing). It is found that under certain molar ratio of MTS to TEOS, the structure of modified polysiloxane coating could be effectively densified and the coating hardness increases significantly. Meanwhile, the bilayer coating system still exhibits excellent transmission, high laser-induced damage threshold as well as satisfactory moisture resistance.
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CELLULOSE
·
2022
·Vol. 29
·期 7
·4243-4254
·
IF 6.123
Lin Ling,Wang Chunxia,Mao Haiyan,Wu Huanling,Li Ziyin
Research on multi-functional fabrics is an inevitable trend in the future development of textile field. Nevertheless, the key to the development of multifunctional fabric is how to solve the problem of contradictory function combination and how to achieve the multifunctions. In this work, a novel multifunctional fabric based on cellulose/silica microcapsules was developed by using a facile and economical method. Owing to the loaded essence and hydrophobic coupling reagent and UV absorber modified silica of microcapsules, the coated fabric not only exhibited the slow-release property of fragrance, but also had the excellent superhydrophobicity and ultraviolet (UV) protection. Furthermore, this multifunctional fabric also displayed the durable superhydrophobicity and UV protection even after chemically or mechanically damaged. The development of multifunctional fabrics largely depends on the development of textile functional finishing agent and finishing technology. Therefore, it is very important to develop new functional microcapsules or finishing agent. Graphical abstract
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 17
·4877-4884
·
IF 4.478
Deng Hao-Hua,Yang Hui-Jing,Huang Kai-Yuan,Zheng Yi-Jing,Xu Ying-Ying,Peng Hua-Ping,Liu Yin-Huan,Chen Wei,Hong Guo-Lin
As a kind of sensing and imaging fluorescent probe with the merit of low toxicity, good stability, and environment-friendly, silicon nanoparticles (SiNPs) are currently attracting extensive research. In this work, we obtained mitoxantrone-SiNPs (MXT-SiNPs) with green emission by one-pot synthesis under mild temperature condition. The antenna based on pyridoxal phosphate (PLP) was designed for light-harvesting to enhance the luminescence of MXT-SiNPs and to establish a novel sensing strategy for alkaline phosphatase (ALP). PLP transfers the absorbed photon energy to MXT-SiNPs by forming Schiff base. When PLP is dephosphorized by ALP, the released free hydroxyl group reacts with aldehyde group to form internal hemiacetal, which leads to the failure of Schiff base formation. Based on the relationship between antenna formation ability and PLP hydrolysis degree, the activity of ALP can be measured. A good linear relationship was obtained from 0.2 to 3.0 U/L, with a limit of detection of 0.06 U/L. Furthermore, the sensing platform was successfully used to detect ALP in human serum with recovery of 97.6–106.2%. The rational design of antenna elements for fluorescent nanomaterials can not only provide a new pathway to manipulate the luminescence, but also provide a new direction for fluorescence sensing strategy.
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npj Science of Food
·
2022
·Vol. 6
·期 1
·1-9
·
IF 7
Cao Qing-Qing,Wang Jie-Qiong,Chen Jian-Xin,Wang Fang,Gao Ying,Granato Daniel,Zhang Xuebo,Yin Jun-Feng,Xu Yong-Quan
Tieguanyin is one of the most consumed oolong teas because of its distinctive flavor. The brewing process is crucial for the flavor performance of traditional teas, thus the effects of brewing conditions, including water/tea ratio (R), brewing temperature (T), and time (S) on the sensory traits, chemical composition, and antioxidant activity of Tieguanyin tea infusion were investigated using quadratic orthogonal regression design. Results showed that R affected all the quality variables most, its reduction could lead to the promotion of tea infusion concentration, antioxidant activity, and taste intensity, which was favored by the tea consumers drinking tea almost daily (DTD) but unacceptable for those drinking tea hardly (DTH). Based on the optimization of brewing conditions in response surface methodology (RSM), we recommended several brewing schemes for diverse consume goals: R = 34 mL/g, T = 80 °C, S = 80 s for DTH; R = 39 mL/g, T = 100 °C, S = 127 s for DTO (the consumers drinking tea occasionally); R = 20 mL/g, T = 100 °C, S = 100 s for DTD; R = 26 mL/g, T = 100 °C and S = 127 s for the common consumers seeking for flavor and health benefits. These results would be helpful for tea consumers with multiple demands.
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Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 2
·1221-1232
·
IF 11.806
Zhang Chentao,Sun Jiaxun,Lyu Sha,Lu Zhengyang,Li Tao,Yang Ye,Li Bin,Han He,Wu Bangyao,Sun Haoyang,Li Dandan,Huang Jintao,Sun Dazhi
The worldwide pandemic, coronavirus COVID-19, has been posing a serious threat to the global economy and security in last 2 years. The monthly consumption and subsequent discarding of 129 billion masks (equivalent to 645,000 tons) pose a serious detrimental impact on environmental sustainability. In this study, we report a novel type of nanofibrous membranes (NFMs) with supreme filtration performance and controllable degradation rates, which are mainly composed of polylactic acid (PLA) and artificially cultured diatom frustules (DFs). In this way, the filtration efficiency of particular matter (PM) and the pressure drop were significantly improved in the prepared PLA/DFs NFMs as compared with the neat PLA NFM. In specific, with incorporation of 5% DFs into fibers, PM 0.3 removal with a filtration efficiency of over 99% and a pressure drop of 109 Pa were achieved with a membrane thickness of only 0.1 mm. Moreover, the yield strength and crystallinity degree of the PLA/DFs5 NFMs were sharply increased from 1.88 Mpa and 26.37% to 2.72 Mpa and 30.02%. Besides those unique characters, the PLA/DFs5 presented excellent degradability, accompanied by the degradation of 38% in 0.01 M sodium hydroxide solution after 7 days and approximately 100% in natural condition after 42 days, respectively. Meanwhile, the environmentally friendly raw materials of the composite polylactic acid and artificially cultured diatom frustules could be extracted from corn-derived biomass and artificially cultivated diatoms, ensuring the conformance to carbon neutrality and promising applications in personal protection. Graphical abstract
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危险品化学品经营许可证（带存储）