Inorganic Chemistry Frontiers
·
2016
·Vol. 3
·期 8
·1082-1090
·
IF 4.532
Min Li,Xiaoyang Liu,Li Liu,Bing Ma,Benxian Li,Xudong Zhao,Wenming Tong,Xiaofeng Wang
A series of Yb3+/Tm3+ co-doped β-NaYF4 (β-NaYF4:Yb,Tm) crystals have been successfully synthesized via the molten salt synthesis (MSS) method. A unique strong green emission of Tm3+ was observed, which cannot be obtained by any other method. The red, green and blue (RGB) light emissions have been obtained simultaneously in the presence of a single activator (Tm3+). The influencing factors of crystal growth have been studied in detail, in order to understand the change of the transition probabilities of Tm3+. Subsequent studies indicate that the RGB light emissions of Tm3+ can be effectively tuned by varying the concentration of sensitizers (Yb3+ and Mn2+) and the reaction time. Consequently, the effective multicolor upconversion (UC) luminescence was obtained, especially a strong white light, which was not obtained in the β-NaYF4:Yb,Tm system earlier. To our knowledge, it is the first time that the UC properties in the β-NaYF4:Yb,Tm system have been investigated by altering the transition probabilities at the same energy level of Tm3+.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2020
·
IF 4.982
Xin Jin,Xiaorong Li,Jiao Kong,Wei Xie,Meijun Wang,Jiancheng Wang,Weiren Bao,Liping Chang
The high yields of coke and tar pitch relating to volatile reactions can cause plug in the product lines during low temperature pyrolysis of low-rank coals. To study the potential transformation of volatile into coke during its migration in the pyrolysis process, six distillates and their blends from the same coal tar were heated at 400–600 °C. The composition , radicals of six distillates and coke structure were characterized by GC × GC–MS, ESR and Raman techniques, respectively. The results show that the coke yields increase with temperature during thermal reaction for all six distillates. When light oil and pitch are blended, the interaction between the two distillates compresses the transformation of volatile into coke above 500 °C. This can be ascribed to that the reactive hydrogen radicals generated from light oil may weaken the bonding between large molecules. By contrast, other distillates (phenolic oil, naphthalic oil, wash oil and anthracene oil) promote coke formation, resulting in higher coke yields than expected. It is also observed that the highest extent of interaction occurs between phenolic oil and pitch, which may be related to the high content of oxygen containing compounds in phenolic oil and the high electron density of the compounds in pitch.
研究领域:
化学工程
·
能源科学
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2015
·Vol. 6
·期 48
·8343-8353
·
IF 5.52
Lingdi Chen,Jiaxing Zhang,Yujie Liu,Hongdong Zhang,Guowei Wang
Several novel multiblock copolymers, (PEO-b-PS-b-PEO-Diyne)s, [PEO-b-PS-b-PEO-(OH)4]s and (PEO-b-PS-b-PEO-Acetal)s, with the same compositions but different linkages were constructed, and their micellization and application were studied. First, the precursor HO-PEO-b-PS-b-PEO-OH was prepared by sequential LAP and ROP mechanisms, and the precursor Propargyl-PEO-b-PS-b-PEO-Propargyl was achieved by a subsequent modification procedure. Subsequently, using the efficient Glaser coupling reaction, the multiblock copolymer (PEO-b-PS-b-PEO-Diyne)s was synthesized and the dyine groups embedded in the main chain were modified by a thiol–yne reaction to give multiblock copolymer [PEO-b-PS-b-PEO-(OH)4]s. Also, using the efficient Williamson reaction, the multiblock copolymer (PEO-b-PS-b-PEO-Acetal)s was obtained. Finally, the micellar morphologies formed from the synthesized copolymers were investigated and compared by DLS and TEM measurements, and the in vivo distribution of the micelles was also studied by loading them with a fluorescent probe. The results revealed that, under the same conditions, the multiblock copolymers can form micelles of different sizes. Due to the hydrophobicity of the introduced dyine groups and PS segments, smaller sized micelles can be formed, which traverse the BBB and therefore might result in a therapeutic application in the treatment of brain disease. However, the hydrophilicity of the acetal and hydroxyl groups gave a similar effect to that of the PEO segment, and larger sized micelles were formed.
研究领域:
高分子化学
·
纳米医学
·
药物递送
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Jingyu Zhao,Cong Wang,Yaru Li,Congmei Chen,Ping Na
This study revealed the mechanism of the photocatalytic oxidation of As(III) by phosphotungstic acid (PTA) via experiments and density functional theory (DFT) simulations. All the experimental results were highly consistent with the simulated data. The results showed that hydroxyl radical ( OH)was the main reactive species for the photocatalytic oxidation of As(III) by PTA. Interestingly, when 2-propanol was added to the system, the main reactive species was converted to peroxide species (-OOH). The effect of the O 2 , H-sites, radicals, and light irradiation time were studied in this research and a 5 steps -OOH mechanism of oxidation of As(III) was first proposed and proved. This mechanism included the adsorption of O 2 on H-sites of the catalyst surface; the formation of the peroxide species -OOH; the -OOH dissociated from catalyst surface and reacted with As(III) to form HOO-As(III) compound; the transformation of the HOO-As(III) to As(V); and the regeneration of the catalyst. What represented in this study should provide a rational theoretical support for oxidation of As(III) to As(V).
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Shouxian Zhong,Longjie Yuan,Xiang Li,Yan Xie,Danping Wu,Xinwei Dong,Chenghong Ao
Dye recovery offers a sustainable approach to treating dyeing wastewater. However, existing adsorbents used in such treatments lack high selectivity for dyes with the same charge and have unsatisfactory recycling properties, which have hindered progress in this field. Herein, the in situ loading of silicon carbide (SiC) and in situ growth of lanthanum hydroxide (La(OH) 3 ) on a cellulose gel-coated filter paper were achieved using a facile dip-coating method. The cellulose used was extracted from bagasse. The resulting membrane exhibits a high rejection rate for the anionic dye Congo red (97%) but a low rejection rate for anionic methyl orange (1.5%) owing to the incomplete coverage of La(OH) 3 by SiC. La(OH) 3 , an electron-deficient compound, shows a strong affinity towards electron-rich organics (e.g. Congo red). Moreover, its electron-deficient characteristic is conducive to separating photoinduced electrons/holes in SiC, improving membrane recyclability by enhancing photodegradation of the adsorbed dyes. Notably, after spraying with a low-concentration cellulose solution, the recyclability of the membrane is further improved because of its increased structural integrity during the recycling process. This work offers a method to utilise waste bagasse for dye recovery while demonstrating the feasibility of La(OH) 3 for photocatalytic applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2025
·
IF 6.6
Kangzhi Deng,Kai Feng,Huan Li
Biomass waste, a renewable energy source, can be converted into electricity through electrochemical processes. Liquid catalytic fuel cells (LCFCs) have garnered increasing attention due to their ability to utilize complex biomass fuels directly. However, conventional LCFCs face challenges related to the cross-membrane permeation of catalysts, which leads to electrolyte imbalance and cell failure. To address the issue, this study proposed a novel LCFC system using the same catalyst, molybdovanadophosphoric heteropolyacid (PMoV), on both the anode and cathode, effectively mitigating catalyst permeation. Under ambient conditions, the PMoV-LCFC system achieved a maximum power density of 3.39 mW/cm2 using glucose as the fuel, and the system demonstrated stable performance over five days. Notably, cyclic discharge tests using expired bread as fuel further show the system's effectiveness. The TOC degradation rate reached a maximum of 23.36%, and formic acid was the primary intermediate. The PMoV-LCFC system effectively reduced catalyst crossover and maintained stable electrochemical performance, offering new insights for designing biomass fuel cells and significantly contributing to waste management.
研究领域:
能源科学
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环境科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2016
·
IF 3.902
Shenna Chen,Haowen Huang,Lingyang Zhang,Yun Chen,Xuanyong Liu
In this study, a strategy for load and release of different kinds of molecules on the same gold nanorods (GNRs) was developed. An anticancer drug, doxorubicin hydrochloride (DOX), was firstly chemically conjugated on the GNRs. To efficiently load another type of target molecules DNA on the same GNRs, a polyelectrolyte Poly (ethylene imine) (PEI) was adsorbed on the [email protected] to form [email protected] @PEI. Then, the positive charge [email protected] @PEI allows the GNR conjugates to interact with negative charged DNA by an electrostatic interaction, enabling their full conjugation. A platform to load two kinds of target molecules conjugated on the same GNRs was fabricated. On the other hand, selective and sequential release of the different target species may be triggered by chemical reaction and near infrared (NIR) laser. The release of DOX was achieved by Na 2 S 2 O 3 reacting with GNRs and the discharge of DNA conjugated on the [email protected] @PEI was accomplished by local-heating using NIR laser triggered release. Furthermore, the selective and alternate release of different target species from the GNRs inside MCF-7 cells was monitored by fluorescent imaging, providing a potential synergistic cancer treatment.
研究领域:
纳米技术
·
癌症研究
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生物医学工程
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Haisheng Lin,Qingyin Li,Lijun Zhang,Shu Zhang,Xun Hu
The high tendency towards polymerization is a bottle-neck issue in upgrading of bio-oil, which, however, is highly desirable in co-hydrothermal carbonization (HTC) of biomass with bio-oil for enhancing production of hydrochar . In this study, co-HTC of bio-oil of the same origin with poplar sawdust was conducted at 180 to 260 °C. The results showed that the HTC in a water medium containing 10% bio-oil could enhanced the yield of hydrochar by ca. 36% at 220 or 260 °C through the cross-polymerization of the sugar-derived furans and ketones/aldehydes as well as the phenolics in bio-oil with the sawdust-derived organics. Furans/sugars in bio-oil showed much more contribution to the increase of hydrochar yield than the phenolics like guaiacol . The highly reactive organics in bio-oil even could react with the crystal region of cellulose at 180 °C, and affected property of hydrochar at especially the higher temperatures by promoting deoxygenation , enhancing carbonization, eliminating polar functionalities like -OH, retaining C=O for continued polymerization, etc. The co-existence of aliphatic organics and phenolics in bio-oil renders the simultaneous formation of highly volatile fraction and aromatic structures in the hydrochar. These created the carbon-rich hydrochar with higher crystallinity , lower hydrophilicity and improved comprehensive combustion index.
研究领域:
能源与环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Yuqing Zhong,Yongling Lu,Lishuang Lv
Reactive carbonyl species (RCS) are generated during thermal food processing, and their accumulation in the body increases the risk of various chronic diseases. Herein, the RCS-scavenging ability of theanine, a unique nonproteinogenic amino acid, was evaluated in terms of the scavenging rate, reaction kinetics, and reaction pathway using LC–MS/MS. Three major products of theanine conjugated with acrolein (ACR) and glyoxal (GO) were prepared and identified using nuclear magnetic resonance. Thereafter, the simultaneous reactions of four types of RCS (namely, ACR, crotonaldehyde, methylglyoxal, and GO) with theanine were discussed in RCS–theanine and RCS–tea models. Under different reaction ratios, theanine could nonspecifically scavenge the four coexisting RCS by forming adducts with them. The amount of theanine–RCS adducts in green and black tea was more than that of catechin (epigallocatechin gallate, epigallocatechin, epicatechin gallate, and epicatechin)–RCS adducts despite the lower content of theanine than catechins. Thus, theanine, as a food additive and dietary supplement, could demonstrate new bioactivity as a promising RCS scavenger in food processing.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2020
·
IF 4.089
Mengwei Wang,Yiming Ma,Peng Shi,Shichao Du,Songgu Wu,Junbo Gong
There have been many studies on the preparation of cocrystals based on the synthon structures, but the synthons cannot completely guarantee the formation of cocrystals. On the basis of the widespread presence of the amino-pyridine synthon, we selected nimesulide (NMS) as the host component and a series of pyridine analogues (pyrazine (PYE), 4,4′-bipyridine (BP), trans-1,2-bis(4-pyridyl)ethylene (BPE), 1,2-bis(4-pyridyl)ethyne (BPY), 1,2-bis(4-pyridyl)ethane (BPA), and 1,3-bis(4-pyridyl)propane (BPP)) as coformers and thoroughly explored the difference in the ability of cocrystal formation. We successfully obtained four new cocrystals of NMS-BP/BPE/BPA/BPY, while cocrystals of NMS and PYE/BPP were not identified. By means of structural analysis and theoretical computation, we believe that PYE, with the weakest H-bond acceptor capacity and insufficient benzene ring, has difficulty in constructing a three-dimensional structure with NMS through effective N–H···N H-bonds and π–π stacking. Molecular flexibility could be a great resistance to form a cocrystal between BPP and NMS. Through quantitative calculation of Ridge and Lasso regression, it is found that the molecular electrostatic potential (MESP), h_ema (sum of hydrogen bond acceptor strengths), Kier flex (molecular flexibility), and the horizontal distance of two N atom projections of coformers have a descending effect on the cocrystal formation.
研究领域:
药物化学
·
晶体工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Jian-Fang Xu,Fei Wang,Xing Fan,Turghun Muhammad,Peter N. Kuznetsov,Ya-Ya Ma
Two coal samples in the same mine but different coal seams, soft coal and hard coal, were subjected to a parallel thermal dissolution process using two organic solvents to obtain four soluble portions (SPs). A preparative high performance liquid chromatography (prep-HPLC) with a fraction collector was introduced to obtain twenty-eight fractions from the SPs. Both gas chromatograph/mass spectrometry (GC/MS) and Orbitrap-MS with a collision cell were employed to elucidate the molecular structure of soluble species. Some heavy aromatic compounds in SPs not identified by GC/MS were detected in fractions, indicating that the off-line prep-HPLC is of perfect separation and enrichment ability, and can improve the reliability of analytical data. In addition, to preferably elucidate the difference in composition of compounds between the two coals, the possible fragmentation pathways in the collision cell were proposed. Such accurate identification will provide theoretical guidance for the efficient utilization of coals in the same mine but different coal seams, and the safety guidance to avoid mine accidents generated by the inconsistence in coal seams.
研究领域:
煤炭化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Junkun Yan,Yinhao Dai,Guiqin Xiao,Yuhua Zhang,Jinlin Li,Jingping Hong
Three Nb 2 O 5 supported Pt-promoted cobalt catalysts were prepared by co-impregnation and sequential impregnation methods. The dispersion of cobalt species was controlled by glow discharge plasma technique, and cobalt particle size on all three catalysts are in the same level (4.2–4.6 nm). It was found that the metal precursor impregnation sequence significantly affected the interaction among Co, Pt and Nb 2 O 5 , and thus results in different H 2 adsorption capacity. Compared to the catalyst prepared by first impregnation of Pt precursor (Pt-Co/Nb 2 O 5 ), the catalysts prepared by simultaneous impregnation of Co and Pt precursors (CoPt/Nb 2 O 5 ) and first Co impregnation (Co-Pt/Nb 2 O 5 ) obtained a significantly decreased interaction among Co and Nb 2 O 5 . Moreover, high cobalt reducibility (>88 %) was realized at such high cobalt dispersions on these two catalysts, the corresponding weaker H 2 adsorption strength and more active sites resulted in their 1.8 times higher FTS activities than Pt-Co/Nb 2 O 5 .
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）