FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 10
·2664-2672
·
IF 2.153
Li Jiahe,Wu Weihong,Meng Weihua,Zhang Weiwei,Zhou Zhaoxi,Wang Tian,Xu Jianzhong,Qu Hongqiang
In this study, we designed a new flame retardant to improve the fire safety performance of epoxy resin (EP). Graphitic carbon nitride (g-C 3 N 4 ) was derived from melamine through a solid-phase reaction, after which nickel ammonium phosphate nanowires (NiNH 4 PO 4 ·H 2 O) were grown on the g-C 3 N 4 using a hydrothermal method. The resulting material (g-C 3 N 4 /NiNH 4 PO 4 ·H 2 O) was a halogen-free flame retardant containing effective flame-retardant elements such as C, N, P, and Ni. Subsequently, g-C 3 N 4 /NiNH 4 PO 4 ·H 2 O was added to EP to test its fire resistance and mechanical properties. When the amount of g-C 3 N 4 /NiNH 4 PO4·H 2 O was 5 phr (per hundred resin), the peak of smoke production rate and peak heat release rate of the EP composite were reduced by 35.42 and 70.4 %, respectively, compared to those of pure EP. Meanwhile, the limiting oxygen index of the EP composite was enhanced to 30.0 % from 24.5 % (pure EP). Finally, the flame-retardant mechanisms of the gas phase and condensed phase were explored.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 3
·528-534
·
IF 1.307
Yu Ruomeng,Shi Yongzheng,Yang Dongzhi
M icro-size oil adsorbents are effective for the rapid remediation of special oil spills. Here, N-doped reduced graphene oxide(RGO) microspheres( ca. 150 µm in diameter) with a local radially aligned and porous structure are fabricated by combining electrospray-freeze-drying with thermal treatment for rapid separation of oil-water. Owing to its hydrophobic/oleophilic properties and oriented structure, the N-doped RGO microspheres achieve high capacities and fast adsorption rates for a variety of oils and organic solvents. Furthermore, excellent oil-water separation performance on floating oil/oil-water emulsions and stable cyclic adsorption capacities are obtained for the local radially aligned and porous microsphere. Therefore, N-doped RGO microspheres with the unique porous structure have the potential for the remediation of oily sewage and oil spills.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 6
·1-10
·
IF 5.833
Zhang Li,Wang Zihan,Wang Huiping,Dong Wenjuan,Liu Yang,Hu Qin,Shuang Shaomin,Dong Chuan,Gong Xiaojuan
Carbon dots (CDs) are a rising star in the field of cellular imaging, especially cytoplasmic imaging, attributing to the super-stable optical performance and ultra-low biological toxicity. Nucleolus can accurately reflect the expression state of a cell and is strongly linked to the occurrence and development of many diseases, so exploring bran-new CDs for nucleolus-orientation imaging with no-wash technology has important theoretical value and practical significance. Herein, nitrogen-doped carbon dots (N-CDs) with green fluorescence (the relative fluorescence quantum yield of 24.4%) was fabricated by the hydrothermal treatment of m -phenylenediamine and p -aminobenzoic acid. The N-CDs possess small size, bright green fluorescence, abundant surface functional groups, excellent fluorescence stability and good biocompatibility, facilitating that the N-CDs are an excellent imaging reagent for cellular imaging. N-CDs can particularly bind to RNA in nucleoli to enhance their fluorescence, which ensures that the N-CDs can be used in nucleolus-orientation imaging with high specificity and wash-free technique. This study demonstrates that the N-CDs have a significant feasibility to be used for nucleolus-orientation imaging in biomedical analysis and clinical diagnostic applications. Graphical abstract
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 19
·11324-11334
·
IF 4.22
Shen Xiaoshuang,Guo Dengkang,Jiang Pan,Yang Sheng,Li Gaiyun,Chu Fuxiang
Furfurylation could have a significant influence on wood hygroscopicity. However, moisture sorption and its mechanism of furfurylated wood are not fully understood. The aim of this study was to clarify the effect of furfurylation on sorption behavior and the mechanism of moisture sorption for furfurylated wood. Water vapor sorption isotherms were derived from dynamic vapor sorption apparatus and analyzed employing Hailwood–Horrobin model. Simultaneously, fiber saturation point and accessible hydroxyl groups were determined by NMR cryoporometry and deuterium exchange method, respectively. Results indicated that compared with control sample, furfurylated samples with different weight gain percents (WPGs) exhibited a little difference in reduced equilibrium moisture content (EMC R ) throughout RH range. Specifically, an increase below 30% RH and above 60% RH, and a reduction at 30–60% RH in EMC R of the furfurylated samples were showed, when compared with that of control sample. EMC R of 69% WPG displayed no distinguishable difference with that of 23% WPG over the whole RH range. Fiber saturation point increased with enhanced WPGs . However, accessible OH groups possessed a reduction with increased WPGs. The hygroscopic mechanism of furfurylated wood was associated with not only accessible OH groups but also other effects. This work could provide valuable guidance to control moisture-related properties of furfurylated wood.
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ARCHIVES OF MICROBIOLOGY
·
2021
·Vol. 203
·期 7
·4259-4272
·
IF 2.552
Ahmad Manzoor,Ling Juan,Zhang Yanying,Sajjad Wasim,Yang Qingsong,Zhou Weiguo,Dong Junde
Polycyclic aromatic hydrocarbons (PAHs), originating from anthropogenic and natural sources, are highly concerned environmental pollutants. This study investigated the impact of two model PAHs (pyrene and phenanthrene) on bacterial community succession in the seagrass meadows sediment in a lab-scale microcosm. Halophila ovalis sediment slurry microcosms were established, one group was placed as a control, and the other two were treated with pyrene and phenanthrene. Bacterial community succession in response to respective PAHs was investigated by 16S rRNA amplicon sequencing. The results demonstrated that bacterial diversity decrease in each microcosm during the incubation process; however, the composition of bacterial communities in each microcosm was significantly different. Proteobacteria (37–89%), Firmicutes (9–41%), and Bacteroides (7–21%) were the predominant group at the phylum levels. Their abundance varies during the incubation process. Several previously reported hydrocarbon-degrading genera, such as Pseudomonas , Spinghobium , Sphingobacterium , Mycobacterium , Pseudoxanthomonas , Idiomarina , Stenotrophomonas , were detected in higher abundance in pyrene- and phenanthrene-treated microcosms. However, these genera were distinctly distributed in the pyrene and phenanthrene treatments, suggesting that certain bacterial groups favorably degrade different PAHs. Statistical analyses, such as ANOSIM and PERMANOVA, also revealed that significant differences existed among the treatments' bacterial consortia ( P < 0.05). This work showed that polycyclic aromatic hydrocarbon significantly affects bacterial community succession, and different PAHs might influence the bacterial community succession differently.
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高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 6
·1-8
·
IF 5.833
Wang Hai-Bo,Mao An-Li,Tao Bei-Bei,Zhang Hong-Ding,Xiao Zhong-Liang,Liu Yan-Ming
An interesting phenomenon is described that the fluorescence signal of poly(adenine) (A) DNA-templated gold nanoclusters (AuNCs) is greatly improved in the presence of l -histidine by means of l -histidine-DNA interaction. The modified nanoclusters display strong fluorescence emission with excitation/emission maxima at 290/475 nm. The fluorescence quantum yield (QY) is improved from 1.9 to 6.5%. Fluorescence enhancement is mainly ascribed to the l -histidine-DNA interaction leading to conformational changes of the poly(A) DNA template, which offer a better microenvironment to protect AuNCs. The assay enables l -histidine to be determined with good sensitivity and a linear response that covers the 1 to 50 nM l -histidine concentration range with a 0.3 nM limit of detection. The proposed method has been applied to the determination of imidazole-containing drugs in pharmaceutical samples. Graphical abstract
A turn-on fluorescent method has been designed for the sensitive detection of l -histidine as well as imidazole-containing drugs on the basis of the l -histidine-DNA interaction.
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高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2021
·Vol. 27
·期 3
·269-277
·
IF 0
Shi Han,Cheng Yingying,Kang Peng
The metal oxide/nitrogen-doped carbon (NC) compounds zirconium oxide/NC (ZrO 2 /NC) and cerium oxide/NC (CeO 2 /NC) were synthesized via the pyrolysis of polyaniline on the metal oxide surface. The characterization of the ZrO 2 /NC and CeO 2 /NC catalysts showed more active CO 2 reduction reaction activity than that of NC catalyst without metal oxide. Gas chromatography analysis revealed that CO and H 2 were the primary products, and no liquid-phase products were detected via proton nuclear magnetic resonance spectroscopy or high-performance liquid chromatography. The maximum Faraday efficiency of ZrO 2 /NC reached 90% at − 0.73 V (vs. RHE), with the current density of CO at 5.5 mA/cm 2 ; this Faraday efficiency value was higher than that of NC (41%), with the current density of CO at 3.1 mA/cm 2 . The interaction between the metal oxide and carbon allowed the efficient formation of defect sites, especially imine-type nitrogen, strengthening the adsorption of the key reaction intermediate CO 2 •− and thus promoting the CO 2 reduction reaction.
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2021
·Vol. 107
·期 1
·147-153
·
IF 2.151
Zhang Rui,Dong Pengyue,Sun Hongwen,Liu Chunguang
To investigate the combined effects of excess boron (B) and high salinity on the growth of freshwater algal species, Chlorella vulgaris and Microcystis aeruginosa were cultured in the medium with different B and salinities. The results show that high levels of B and salinity inhibited the growth of the two algal species. For C. vulgaris , low levels of B can alleviate the growth inhibition induced by salinity, and low levels of salinity can also relieve the growth inhibition induced by B. In contrast, high levels of salinity have little effect on B toxicity, while high levels of B aggravate salinity stress. For M. aeruginosa , salinity aggravates B toxicity, regardless of salinity levels. B supply worsens salinity stress on M. aeruginosa , regardless of supply doses. These results suggest that it may be possible to control algal bloom by regulating B or salinities.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 12
·7386-7396
·
IF 4.22
Zhou Weixiu,Shen Jiyun,Lin Jiaomin,An Miao,An Lu,Tian Qiwei,Yang Shiping
Gd–chelate magnetic resonance imaging (MRI) contrast agents used in conventional clinical medicine still have some shortcomings, such as their low relaxation rates and poor imaging sensitivity. In this work, a Gd–chelate (Gd–DTPA), with a comparison made to the commercial contrast agent Magnevist was loaded into a zeolitic imidazolate framework (ZIF-8) to construct the efficient T 1 MRI contrast agent Gd–DTPA@ZIF-8. At 0.5 T, the longitudinal relaxivity value ( r 1 ) of Gd–DTPA@ZIF-8 reaches 29.60 mM −1 s −1 , which is about 6 times higher than that of Gd–DTPA. In terms of the retention of Gd–DTPA in ZIF-8, no obvious Gd 3+ ions are released in water and complete culture solution over a long time period. Haemolysis and cytotoxicity experiments revealed that Gd–DTPA@ZIF-8 has good biocompatibility. In addition, the in vivo MRI results prove that Gd–DTPA@ZIF-8 can significantly enhance the T 1 -weighted MRI contrast effect of the tumour site. These advantages make Gd–DTPA@ZIF-8 a potential candidate for biomedical applications.
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Food Analytical Methods
·
2021
·Vol. 14
·期 6
·1121-1132
·
IF 3.366
Sun Chao,Gao Xiaoqi,Wang Lei,Zhou Nan
Reactive nitrogen species (RNS) are vital signaling molecules involved in most physiological and pathological processes. Within RNS, nitric oxide (NO) and its metabolite nitrite (NO 2 − ) have been widely applied in medicinal, food, and environmental fields. However, at present, the methods of detecting RNS by fluorescence quenching through chemical reactions have disadvantages, such as long reaction time and weak anti-interference ability. In response to these existing problems, we have developed a novel fluorescent probe, namely, carbon quantum dots (CDs) that are passivated by benzylamine. The obtained CDs (named B-CDs) possess excellent down- and upconversion properties. In particular, upconversion is used to sensitively and selectively measure NO and NO 2 − under different pH conditions in aqueous media via two different mechanisms (static and dynamic quenching). At pH 7.4, the nanomolar concentration of NO, produced from sodium nitroprusside (SNP) in a concentration-dependent manner, can be rapidly detected with a correlation coefficient ( R 2 ) greater than 0.99. Similarly, the quantitative detection of NO 2 − at pH 1.6 also shows a good linear relationship with a linear range of 0–14 μM, and a limit of detection (LOD) that is as low as 43 nM and 0.65 μM at excitation wavelengths of 800 nm and 375 nm, respectively. Notably, this probe stands out due to its extremely short response time and outstanding selectivity and anti-interference ability against a variety of common interfering substances, while realizing the fast and highly selective and sensitive detection of NO and NO 2 − . Finally, this probe has been successfully applied to the sensing of NO in fetal bovine serum (FBS) samples and NO 2 − in milk and tap water samples. Graphical abstract
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Nano Research
·
2020
·Vol. 14
·期 5
·1397-1404
·
IF 8.183
Chen Tianyu,Huang Mengna,Ye Zhongju,Hua Jianhao,Lin Shen,Wei Lin,Xiao Lehui
Blinking fluorophore perovskite nanocrystals (NCs) were employed to image the fine structure of the polystyrene (PS) electrospun fibers. The conditions of CsPbBr 3 NCs embedded and dispersed into PS were investigated and optimized. The stochastic optical reconstruction microscopy is employed to visualize the fine structure of the resulted CsPbBr 3 @PS electrospun fibers at sub-diffraction limit. The determined resolution in the reconstructed nanoscopic image is around 25.5 nm, which is much narrower than that of conventional fluorescence image. The complex reticulation and multicompartment in bead sub-diffraction-limited structures of CsPbBr 3 @PS electrospun fibers were successfully mapped with the help of the stochastic blinking properties of CsPbBr 3 NCs. This work demonstrated the potential applications of CsPbBr 3 perovskite NCs in super-resolution fluorescence imaging to reconstruct the sub-diffraction-limited features of polymeric material.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 7
·4922-4939
·
IF 3.553
Gao Hongwei,Liu Huihui,He Jinmei,Bai Yongping
Abstract Linear 1,10-decanediamine was chosen as a modified monomer to prepare modified poly(ethylene terephthalate) (PET) with a low content of amide bonds through two different synthetic methods. To evaluate the effect of amide bonds on the properties of poly(ester amide) analogs (PETAs), the performance of this new type of PET was compared with 1,10-decanediol-modified PET as a control group. The formation of hydrogen bonds in the PETAs was confirmed, and the stability of hydrogen-bonding interactions based on the low content of amide bonds at high temperature was discussed. Interestingly, physical cross-linking networks formed by hydrogen-bonding interactions improved the thermal stability, rheology, and mechanical properties of the PETAs. The crystallization properties were studied in depth by a series of tests, the results of which illustrated that the low content of amide bonds acted as a critical crystallization accelerator in the PETAs. A feasible strategy to prepare high-performance PET, which may be used as a packaging material, was introduced in this work. Graphical abstract
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危险品化学品经营许可证（带存储）