ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Qian Yao,Ying Zhang,Yao Fu
We report on catalytic fast pyrolysis microalgae under ammonia atmosphere into acetonitrile over Ga/HZSM-5, which provides a long-term sustainable option for acetonitrile production and microalgae valorization. The effect of various catalysts, reaction conditions and species of microalgae on acetonitrile production was explored systematically. Under the optimized conditions, the maximum carbon yield of acetonitrile from Chlorella vulgaris was 23.4%, and the selectivity of acetonitrile in bio-oil was up to 77.2%. The possible reaction pathways were proposed according to the comprehensive experimental investigation on the conversion of model compounds and intermediates (proteins, carbohydrates, lipids, amino acids, carboxylic acids, furans, and amines). High-resolution transmission electron microscopy (TEM) analysis showed that Ga was present mainly at the outer surface of zeolite crystals, and a small amount of Ga was doped into the zeolite crystals.
研究领域:
化学工程
·
环境科学
·
材料科学
·
生物化学
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产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 20
·1629
·
IF 4.4
Penghui Lei,Qing Chang,Mingkun Xiao,Chao Ye,Pan Qi,Fangjie Shi,Yuhua Hang,Qianwu Li,Qing Peng
A new type of SiCf/TiC-Ti3SiC2composite was prepared by the Spark Plasma Sintering (SPS) method in this work. The phase transformation and interface cracking of this composite under ion irradiation (single Xe, Xe + He, and Xe + He + H ions) and subsequent annealing were analyzed using transmission electron microscopy (TEM), mainly focusing on the interface regions. Xe ion irradiation resulted in the formation of high-density stacking faults in the TiC coatings and the complete amorphization of SiC fibers. The implanted H ions exacerbated interface coarsening. After annealing at 900 °C for 2 h, the interface in the Xe + He + H ion-irradiated samples was seriously damaged, resulting in the formation of large bubbles and cracks. This damage occurred because the H atoms reduced the surface free energy, thereby promoting the nucleation and growth of bubbles. Due to the absorption effect of the SiCf/TiC interface on defects, the SiC fiber areas near the interface recovered back to the initial nano-polycrystalline structure after annealing.
研究领域:
材料科学
·
核材料
·
复合材料
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产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 27
·e01710
·
IF 2
Jialu Ju,Xingyu Liang,Yongxin Tao,Weiming Zhang,Shan Li
Graphical Fluorescent CQDs and N-CQDs are prepared via a facile hydrothermal process using dried mulberry (fruit of Morus nigra L.) aqueous extract as the carbon precursor, with urea as the nitrogen dopant for N-CQDs. Their markedly enhanced antibacterial performance is attributed to their higher production of ROS under illumination, especially ·O2− and ·OH. Carbon quantum dots (CQDs) have attracted significant interest due to their intriguing physicochemical properties, and those derived from natural sources can inherit traits of the source material. Here, we report a facile one-step hydrothermal synthesis of fluorescent CQDs and nitrogen-doped CQDs (N-CQDs) using dried mulberry (fruit of Morus nigra L.) aqueous extract as the carbon precursor, with urea as the nitrogen dopant for N-CQDs. X-ray photoelectron spectroscopy (XPS) confirmed that N-CQDs contained a higher nitrogen and a lower oxygen content, compared with CQDs. Transmission electron microscopy (TEM) revealed spherical nanoparticles with diameters of 0.5–4.5 nm for CQDs and 1.2–2.6 nm for N-CQDs. CQDs exhibited concentration-dependent photoluminescence, shifting from strong blue to green emission, whereas N-CQDs consistently showed intense blue emission. In photodynamic antibacterial tests against Escherichia coli and Staphylococcus aureus , CQDs had a minimum inhibitory concentration (MIC) of 0.48 mg/mL after 1 h of 400–410 nm illumination, whereas N-CQDs had an MIC of only 0.06 mg/mL at 450–460 nm. This markedly enhanced antibacterial performance of N-CQDs is attributed to their higher production of reactive oxygen species (ROS) under illumination, especially superoxide radical (·O 2 − ). Therefore, this process can expand the potential application of mulberry, enabling deeper exploitation.
研究领域:
纳米技术
·
材料科学
·
光动力治疗
·
抗菌应用
·
绿色化学
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产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2015
·Vol. 293
·期 9
·2625-2634
·
IF 1.865
Li Ping,Yang Xiaoyi,Guo Chaohua,Wang Guoyong,Zhang Wei
The adsorption and aggregation behavior of three tetrasiloxane surface active room temperature ionic liquids, N -(2-aminoethyl)-3-aminopropyltetrasiloxane carboxylic acid ammonium, [Si(4)N(2)-2CA(n) ( n = 1, 2, 3)], have been studied on the basis of static/dynamic surface tension, conductivity, dynamic light scattering (DLS), and transmission electron microscopy (TEM). The static surface tension of the Si(4)N(2)-2CA(n) aqueous solutions measured at the critical aggregation concentration (CAC) is observed to be significantly lower than that of amide-functionalized ILs and is comparable to those reported for trisiloxane RT-SAILs, N -(2-aminoethyl)-3-aminopropyltrisiloxane carboxylic acid ammonium and 3-aminopropyltrisiloxane carboxylic acid ammonium. The dynamic surface tension results indicate that adsorption process is a mixed diffusion-kinetic adsorption mechanism. DLS and TEM analysis of Si(4)N(2)-2CA(n) solutions reveal that they can self-assemble into vesicles with an average diameter in the range of 70–500 nm.
研究领域:
化学
·
材料科学
·
胶体与界面化学
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产品关联
DOI
高影响因子
Optoelectronics Letters
·
2014
·Vol. 10
·期 3
·164-167
·
IF 0
Yang Ai-ling,Li Shun-pin,Wang Yu-jin,Bao Xi-chang,Yang Ren-qiang
By adjusting pH values of reactant system, the mass ratio of stabilizer/water and aging temperature, size controllable spherical silver nanoparticles (NPs) were synthesized. The properties of silver NPs are characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and ultraviolet visible (UV-VIS) absorption spectra. Within the pH values of 7.0–11.0, the aging temperature of 80 °C is better to improve silver NPs in shape to nearly sphere, concentrate size distribution and reduce aggregation than the aging temperature of 25 °C. The shape and dispersibility of silver NPs are the best when the pH of the reactant system is within 7.0–8.0. With pH of 7.5, aging at 80 °C, and stabilizer/water mass ratio of 1%, the spherical silver NPs with sizes of 50–70 nm were synthesized. The results are promising to be used to synthesize core/shell NPs when silver NPs are as core.
研究领域:
纳米技术
·
材料科学
·
化学
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产品关联
DOI
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Yanan Cai,Jing He
The release of Mn(II) occurs in the degradation of organic matters by manganese ore (MnO 2 ), resulting in a reduced efficiency. During the degradation of ciprofloxacin (CIP), in a biofilter, this paper put forward a novel method that similar to the geo-cycle of Mn (MnCS) on the Earth to regenerate MnO 2 . The freshly prepared MnO 2 was suitable for the use in the MnCS. It indicated that the mutual conversion between Mn(II), Mn(III), and Mn(IV) in the MnCS, which was driven by CIP and manganese oxidizing bacteria (MnOB), could maintain the activity of MnO 2 . The MnCS showed feasibility in the coexistence of ammonia or humic acid , and provided a kinetic degradation. The physicochemical features of MnO 2 before and after bio-regeneration were characterized by TEM , XRD, BET, and XPS. It was found that the morphological structure of MnO 2 became loose and the maximum peak of pore size distribution became smaller, but the increase of surface area, the change of Mn(III/IV) content, and the decrease of crystallinity favored the bio-regeneration process. Moreover, as a mediator in the MnCS, the group of MnOB was dramatically inhibited by CIP, and the bacterial community had changed significantly. The typical MnOB shared low abundance in the biofilter, while the rarely reported genera (e.g. Sphingomonas ) that related to the formation of Mn deposits appeared to be involved in the MnCS.
研究领域:
环境科学
·
微生物学
·
化学
·
生物技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Jing-Chuan Song,Zhong-Yuan Lu,Zhao-Yan Sun
3-Aminophenol/formaldehyde (AF) resin colloidal spheres with narrow size distribution and high nitrogen content are synthesized in the presence of urea. The obtained particles that indicated by transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM) are spherical morphology and uniform. It can be further carbonized into carbon spheres preserving high nitrogen percent. The particle size is tunable from 300 nm to 850 nm by appropriately varying the concentration of precursor or water/ethanol volume ratio. Even using the water as an only solvent, we can also obtain spherical particles with different size. Typically, the nitrogen percent in the obtained polymer and carbon particles is as high as 10.39 wt% and 8.95 wt%, respectively. The typical surface area of resulted carbon particles obtained from nitrogen adsorption measurement is 459 m 2 g −1 . X-ray diffraction demonstrates the obtained carbon spheres are amorphous , which are expected to have practical application in the field of energy devices. The method can be considered as a low cost and facile method for mass production.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2016
·Vol. 8
·期 23
·3636-3643
·
IF 4.724
Zhenyou Gui,Wenrong Cao,Shunmugavel Saravanamurugan,Anders Riisager,Lifang Chen,Zhiwen Qi
Graphical Efficient noble alloy : Au–Pd supported on zinc hydroxycarbonate (ZOC) catalysts shows high activity for 5-hydroxymethylfurfural oxidation. The basicity of ZOC can play a crucial role in enhancing the yield of FDCA. Moreover, Au–Pd/ZOC can be recycled at least six times without significant loss of its activity. Bimetallic catalysts with Au–Pd supported on zinc hydroxycarbonate (ZOC) were synthesized by a simple deposition–precipitation method and analyzed by transmission electron microscopy to have a narrow-size distribution of predominantly 1–2 nm. The prepared Au–Pd/ZOC catalysts exhibited excellent activity towards 5-hydoxymethylfurfural (HMF) oxidation in water in the presence of the base NaHCO 3 at benign conditions of 80 °C and 3 bar O 2 , resulting in quantitative yield of 2,5-furandicarboxylic acid (FDCA). The addition of base not only enhanced the yield of FDCA but also stabilized the support ZOC by preventing ZOC from the reaction with formed carboxylic acid intermediates/products, thus allowing Au–Pd/ZOC to be recycled for at least six times without significant loss of activity. The basicity of ZOC could play an important role in obtaining the improved yield of FDCA as compared to other supports.
研究领域:
催化化学
·
绿色化学
·
化学工程
·
材料科学
·
有机合成
·
环境科学
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2025
·
IF 5.2
Meng Xie,Yan He,Rui Xue,Wenjie Fan,Menglu Li,Quan Sun,Jennifer Q. Lu,Zongbo Zhang,Wenxin Fu
Next-generation, high-frequency communication systems demand polymer nanocomposites with simultaneously ultralow dielectric constant (Dk < 2.0) and high thermomechanical stability while addressing the critical challenge of reconciling nanoscale dispersion uniformity with interfacial compatibility. Herein, we propose a molecular engineering strategy to covalently anchor oligomeric silsesquioxane domains within a benzocyclobutene resin (BCB) matrix via synergistic click chemistry and thermally triggered Diels–Alder cross-linking. The silsesquioxane precursors are precisely synthesized through platinum-catalyzed hydrosilylation and hydrolysis-polycondensation, enabling the formation of ladder/cage-like and networked Si–O–Si structures. This covalent integration strategy ensures uniform silsesquioxane dispersion at the subnanoscale, as evidenced by small-angle X-ray scattering (SAXS) and high-resolution transmission electron microscopy (TEM). The optimized nanocomposite exhibits an ultralow dielectric constant (Dk = 1.78) and loss (Df = 2.73 × 10–3) at 1.15 kHz, outperforming most reported BCB hybrids. This work establishes a molecular-scale engineering paradigm for low-Dk materials, offering transformative potential in 5G/6G communications and high-density integrated circuit technologies.
研究领域:
材料科学
·
聚合物纳米复合材料
·
介电材料
·
电子封装
·
高频通信系统
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Faqiang Shi,Zhonghua Li,Limeng Liu,Jiandong Wu,Jinfu Ma,Yujin Wang
In previous works, it was found hard to synthesize “phase pure” ζ-Ta 4 C 3-z at relatively low temperatures even by prolonged heating, though ζ-Ta 4 C 3-z was believed stable till decomposition at ~2130°C. When the samples were subjected to TEM , vast richness of locally disordered structures in close relation with stacking of the close-pacted Ta-atom planes was observed. Although kinetic factors including diffusion of C atoms/vacancies and re-stacking of the Ta-atom planes explain the densely disordered structures, the richness of local disorders is a scenario that shows cohabitant of the cubic, rhombohedral, and hexagonal structures in a single grain, i.e. formation of a “hybrid grain” consisted of the three symmetries, indicating a transitional or intermediate stage before complete formation of the final phase of rhombohedral ζ-Ta 4 C 3-z . This time tantalum carbide ceramics TaC x with C:Ta atomic ratios x = 0.66 and 0.7 were prepared by reaction hot pressing of TaC and Ta powder mixtures. 5–30 mol% Cu/Ag additives and heat treatments were used to reproduce “hybrid grains” to facilitate further TEM and HRTEM observations on the disordered hybrid grains to argue for the transitional/intermediate stage. The cohabitant cubic, rhombohedral, and hexagonal structures in single grains may also help explain the difficulty in identification of the various phases by XRD in the transitional/intermediate stage of ζ-Ta 4 C 3-z reaction. Microstructural evolution and fracture toughness of the composites were also investigated.
研究领域:
材料科学
·
陶瓷
·
纳米材料
·
固体化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
·
2021
·
IF 5.277
Houqi Ning,Yu Cong,Hong Lin,Jingxue Wang
Cationic peptide chimeric lysins, Lysqdvp001-5aa, Lysqdvp001-10aa and Lysqdvp001-15aa, were designed based on lysin Lysqdvp001 from Vibrio parahaemolyticus ( V. parahaemolyticus ) phage qdvp001. These chimeric lysins showed equivalent peptidoglycan hydrolysis activities with Lysqdvp001 and could lyse the bacteria from the outside. The antibacterial activity as well as outer and inner membrane permeabilization of Lysqdvp001 and chimeric lysins against V. parahaemolyticus were Lysqdvp001-15aa>Lysqdvp001-10aa>Lysqdvp001-5aa>Lysqdvp001. Lysqdvp001-15aa exhibited an excellent antibacterial activity with minimum inhibition and bactericidal concentrations (MIC and MBC) of 0.2 and 0.4 mg/mL, respectively, and its antibacterial spectrum was much broader than phage qdvp001. Membrane hyperpolarization and membrane phospholipid exposure of V. parahaemolyticus were observed after Lysqdvp001-15aa treatments. Transmission electron microscope (TEM) showed Lysqdvp001-15aa destroyed structure integrity of V. parahaemolyticus . Besides, MIC and MBC of Lysqdvp001-15aa decreased V. parahaemolyticus counts in oyster by 3.20 and 4.03 log 10 CFU/g. Lysqdvp001-15aa at MBC eradicated about 50% of V. parahaemolyticus biofilms and inhibited over 90% of the formation of the bacterial biofilms.
研究领域:
微生物学
·
细菌学
·
食品安全
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYTOMEDICINE
·
2024
·
IF 6.7
Peipei Cheng,Xinting Wang,Qian Liu,Tianshu Yang,Enrui Dai,Wanjing Sha,Huiyan Qu,Hua Zhou
ABSTRACT Background The terminal stage of all cardiovascular diseases typically culminates in heart failure (HF), with no effective intervention available to halt its progression. LuQi formula (LQF) has been employed in clinical for numerous years to significantly ameliorate cardiac function in HF patients. Nevertheless, the underlying mechanism of LQF's efficacy remains inadequately comprehended. Cardiomyocyte ferroptosis has served as a pathogenic mechanism in HF. The goal of the current experiment was to ascertain whether LQF ameliorates HF by preventing cardiomyocyte ferroptosis and to elucidate the intrinsic mechanism involved. Purpose This research objective is to investigate the impact and underlying mechanism of LQF attenuating cardiomyocyte ferroptosis in heart failure. Methods Transverse aortic constriction (TAC) was performed to construct the HF mouse model. Neonatal rat cardiomyocytes (NRCMs) were subjected to in vitro experiments. High-performance liquid chromatography (HPLC) identified the bioactive compounds in LQF. Transcriptomic and quantitative proteomic analyses revealed the potential targets of LQF anti-HF. Specifically, histological staining evaluated cardiac hypertrophy and fibrosis. Transmission electron microscopy (TEM) observed mitochondrial morphology. The content of Fe 2+ , ROS, MDA, GSH, and GSSH was detected using kits. Molecular docking evaluated the binding activities between essential active ingredients of LQF and critical proteins of cardiomyocyte ferroptosis. Mechanistically, the expression levels of Nrf2, Keap1, HO-1, SLC7A11, and GPX4 were evaluated using qPCR, Western blot (WB), or immunohistochemical staining. Results The primary nine active ingredients in LQF were detected. Transcriptomic and proteomic analyses demonstrated that LQF may ameliorate HF by preventing cardiomyocyte ferroptosis. Histomorphometric analyses revealed that LQF attenuates myocardial hypertrophy and fibrosis. TEM revealed that LQF diminished mitochondrial shrinkage and increased membrane density in myocardial tissue. Additionally, LQF diminished reactive oxygen species (ROS) generation in cardiomyocytes and suppressed cardiomyocyte ferroptosis. Furthermore, the molecular docking technique revealed that the primary active ingredients of LQF had suitable binding activities with Nrf2, GPX4, and SLC7A11. Western analysis further verified that LQF activated the Nrf2/GPX4 signaling axis. decreased SLC7A11 and HO-1 expression. Conclusions These results demonstrated that LQF prevents cardiomyocyte ferroptosis via activating Nrf2/GPX4 signaling axis and suppressing SLC7A11 and HO-1 expression. Concurrently, it contributed to elucidating the intrinsic mechanism of LQF and provided a scientific rationale for its development as a novel cardiovascular therapeutic drug.
研究领域:
心血管疾病
·
药理学
·
分子生物学
·
细胞生物学
·
信号转导
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）