JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Guanjie Xing,Min Huang,Simeng Hao,Chuansheng He,Xiaohong Li,Louzhen Fan,Yunchao Li
To obtain high-capacity electrode materials and meanwhile actualize the reuse of scrap lead paste, a novel alkylamine-mediated thermolysis route is proposed herein for one-pot preparation of high-quality PbO nanomaterials , relying on the thermal decomposition of lead carboxylate in hot solvent in the presence of hexadecylamine (HDA). This synthetic route allows us to produce uniform PbO nanowires with a diameter of 7.1 nm and a length beyond 10 μm, and nanosheets and nanorings with a lateral size of ca. 310 nm on a gram scale, by simply tuning the alkylamine content or reaction time. In particular, we have employed various means to unveil the key role of HDA, i.e., precursor activation and surface passivation function, in the controlled preparation of such PbO nanomaterials. Impressively, when serving as the positive active materials for lead acid batteries (LABs), the anodes based on PbO nanowires displayed an excellent discharge performance: its discharge capacity and active material utilization ratios could reach 164.3 mA h/g and 68.5% respectively even at a discharge current density as high as 50 mA/g, which are superior to most of the previously-reported values. Such an excellent discharge performance was speculated to result from the synergization effect of the large ECSA, small charge transfer resistance and highly active exposed facets associated with the PbO nanowires.
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ENERGY & FUELS
·
2020
·
IF 3.421
Suya Yin,Taishun Yang,Yuan Xue,Maiying Xie,Fengfei Chen,Hualin Lin,Bin Dai,Feng Gao,Sheng Han
High-efficiency pour point depressants (PPDs) for diesel fuel were obtained using a series of tetradecyl methacrylate-N-α-methacrylamide copolymers (C14MC-NMLR) with different molar ratios synthesized through radical polymerization of tetradecyl methacrylate (C14MC) and various forms of N-α-methacrylamide (NMLR, R = -phenyl, -naphthyl, -cyclohexyl, -14a, -16a, -18a). The copolymers were characterized by Fourier transform infrared spectroscopy, 1H nuclear magnetic resonance, and thermogravimetric analysis. Results showed that diesel treated with C14MC-NML-phenyl (9:1) and C14MC-NML-14a (6:1) presented better cold flow properties at 2000 ppm, and the reductions in cold filter-plug point (ΔCFPP) and solid point (ΔSP) were (23 and 10 °C) and (22 and 11 °C) at 2000 ppm, respectively. The depressive effects further improved after compounding. When they were combined at a 1:4 mass ratio, PPDC-6 presented the best depressive effects, and the ΔCFPP and ΔSP reached 25 and 11 °C at 1000 ppm dosage and 28 and 15 °C at 2000 ppm dosage, respectively. Additionally, the crystallization behavior and crystal morphology of each treated diesel were explored.
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ORGANIC ELECTRONICS
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2020
·
IF 3.31
Weikun Lin,Gengxu Chen,Enlong Li,Hongxing Xie,Gang Peng,Weijie Yu,Huipeng Chen,Tailiang Guo
All inorganic perovskite quantum dots (PeQDs) of CsPbX 3 (X = Cl, Br, I, or their mixture) are regarded as promising candidates for photovoltaics and optoelectronic devices owing to their excellent and unique optical and electronic properties. However, their inherent poor stability severely limits their practical applications. Herein, aiming at improving their stability and photoluminescence (PL) properties, a novel surface capping ligand strategy was performed via directly synthesizing CsPbX 3 quantum dots (QDs) by hot injection method with straight-chain n-alkylmonoamine instead of conventional organic amine (oleylamine) as ligands. With stronger intermolecular interaction and denser alignment, n-alkylmonoamine ligands would form a stable protective layer on the surface of PeQDs. As a result, the n-alkylmonoamine capped CsPbBr 3 QDs exhibited remarkable long-term storage with 70% of PLQY retaining after 30 days in the open air, impressive water resistance for over 1 h in water, significant photostability with hour-scale laser exposure, and high thermal stability with 60% of PLQY retaining after heating at 80 °C for over 60 min. In addition, by blending the CsPbBr 3 QDs with polymer as the gate dielectric , novel light-erasable transistor memories were fabricated based on the device architecture of a floating-gate transistor memory (FGOTM). Acting as dense charge tunneling layers for charge trapping materials (PeQDs) in light-erasable transistor memory, the alkylmonoamine ligand layers led to significant broadening of memory windows, presenting various charge capture abilities of the PeQDs with the different capping ligands.
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FUEL
·
2020
·
IF 5.578
Fengfei Chen,Jinbao Liu,Taishun Yang,Suya Yin,Baoting Su,Maiying Xie,Bin Dai,Sheng Han,Yuan Xue
Precipitation of n-alkanes at low temperatures is the main factor that affects the cold flow properties of diesel fuel. In order to improve the clod flow properties of diesel fuel, maleic anhydride-methyl benzyl acrylate copolymer (MA-MB) were synthesized and modified with long-chain fatty amine and long-chain fatty alcohol (RNH 2 and ROH, R = C 14 , C 16 , C 18 ) to obtain a series of aminated copolymers R 1 MA-MB (R 1 = N 14 , N 16 , N 18 ) and esterified copolymers R 2 MA-MB (R 2 = C 14 , C 16 , C 18 ). These copolymers were characterized by gel permeation chromatography (GPC), Fourier transform infrared (FTIR) spectroscopy, and proton nuclear magnetic resonance ( 1 H NMR), and the oil affinity and oil solubility were studied by the static contact angle. The influences of them used as pour point depressants (PPDs) on the cold flow properties of diesel fuel were investigated. Results indicate that the esterified copolymers exhibit a better depression effect in depressing the solid point (SP) and cold filter plugging point (CFPP) than that of aminated copolymers. Among that, C 14 MA-MB exhibited the most considerable reduction on the SP and CFPP by 24 and 8 °C at 500 ppm addition, respectively. In addition, the depression mechanism was explored by differential scanning calorimetry, rheological analysis and polarizing optical microscopy. The analysis shows that C 14 MA-MB changed the crystal behaviors by modifying the crystal growth direction, restraining the crystal accumulation, and retarding the formation of large crystals, thus enhancing the cold flow properties of diesel fuel. Therefore, the synthesized copolymers are the highly effective PPDs of diesel fuels.
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Science Bulletin
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2020
·
IF 9.511
Daixing Wei,Yubo Tan,Yiqing Wang,Tingting Kong,Shaohua Shen,Samuel S. Mao
A novel metal/semiconductor photocatalyst , Cu nanoparticles (NPs) modified TiO 2 hollow spheres (Cu/TiO 2 ), was designed for efficient photocatalytic overall water splitting (POWS) under both ultraviolet (UV) and visible (Vis) light. This Cu/TiO 2 photocatalyst possesses excellent POWS performance under Vis light at the highest level among the reported TiO 2 -based photocatalysts. Interestingly, the metal/semiconductor junction formed between Cu and TiO 2 enables controlled water-oxidation product selectivity (H 2 O 2 or O 2 ) via different reaction pathways regulated by irradiation wavelengths. Under UV light , the electrons excited in TiO 2 are captured by Cu NPs through the Cu/TiO 2 Schottky interface for H 2 production, with the photoholes in TiO 2 producing H 2 O 2 through a two-electron process; whilst under Vis light, Cu NPs act as plasmon to inject hot electrons to TiO 2 for H 2 production, while O 2 is produced by hot holes on Cu NPs via a four-electron process. This rational design of function-switchable metal/semiconductor junction may be helpful to understand the mechanisms for POWS with desired gas/liquid water-oxidation products.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 41
·16138-16147
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IF 3.069
Yu Guo,Qing-Ying Yu,Ji Zhang,Hui-Zhen Yang,Zheng Huang,Xiao-Qi Yu
The unique properties of 1,4,7,10-tetraazacyclododecane (cyclen) make it not only a suitable polyamine headgroup in cationic lipids for gene delivery, but also a good host molecule for metal coordination. In this study, a series of cyclen-based lipids and their Zn(II)-complexes were synthesized to study the effect of Zn-coordination on the gene transfection. Both the Zn-free and Zn-containing lipids could form nano-sized particles with suitable positive potential to condense and protect DNA from degradation by DNase. More importantly, Zn coordination could significantly reduce the cytotoxicity of the liposomes. Meanwhile, the gene transfection efficiency of the cyclen-based lipids could also be distinctly improved by the Zn-coordination. Mechanistic studies reveal that the Zn-free and Zn-containing liposomes showed similar cellular uptake properties. However, confocal microscopy shows that Zn-containing liposomes may induce more efficient endosomal escape than the Zn-free counterpart, which could be attributed to their much higher pH buffering capacity. This study presents an efficient strategy to enhance the gene transfection efficiency and biocompatibility of cyclen-based cationic lipids.
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Journal of Materials Chemistry C
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2019
·Vol. 7
·期 40
·12588-12600
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IF 6.641
Saisai Yan,Zhinong Gao,Jia Han,Zhengqin Zhang,Fei Niu,Yingfang Zhang
Exploring stimuli-responsive luminescent materials is still an urgent need for fabricating smart nanodevices. Herein, by taking advantage of the aggregation-induced emission (AIE) effect originating from nonconventional chromophores, stimuli-responsive fluorescent silica nanoparticles (SiO2-NH2-F) have been facilely constructed without adding any fluorophores. The SiO2-NH2-F can not only provide fascinating blue emission but also contrasting fluorescence and shape-transforming responses to acidic pH and high temperature. Significantly, the nanostructure and stimuli-responsive fluorescence properties of SiO2-NH2-F could be further tuned using a tetraphenylethene (TPE)-functionalized carboxylate gemini surfactant (N16-TPE-N16). Owing to its unique chemical-structure, surface-activity, pH-sensitivity and fluorescent properties, the designed N16-TPE-N16 can not only serve as an ingenious “additive” to regulate the construction of SiO2-NH2-F in the structure-directing process but also provide anchored fluorophores and chromophores to improve its original photoluminescence. By appropriately tuning the concentration of N16-TPE-N16, shape-controlled fluorescent silica nanoparticles (AIE-SNs-F) can be prepared directly, producing three different types of silica nanorods (AIE-300-F, AIE-400-F and AIE-600-F). In particular, the incorporated N16-TPE-N16 will further endow the AIE-SNs-F with enhanced fluorescence intensity, especially for longer wavelength bands (up to 3.7-fold), accompanied by improved sensitivity to acidic pH and temperature. The developed AIE-SNs-F integrates two kinds of AIE characteristics into a single system, opening up a new avenue for the controllable fabrication of multifunctional fluorescent nanomaterials.
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Journal of the American Chemical Society
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2019
·
IF 14.695
Xi Hu,Fangyuan Li,Fan Xia,Xia Guo,Nan Wang,Lili Liang,Bo Yang,Kelong Fan,Xiyun Yan,Daishun Ling
Recent advances in nanomedicine have facilitated the development of potent nanomaterials with intrinsic enzyme-like activities (nanozymes) for cancer therapy. However, it remains a great challenge to fabricate smart nanozymes that precisely perform enzymatic activity in tumor microenvironment without inducing off-target toxicity to surrounding normal tissues. Herein, we report on designed fabrication of biodegradation-medicated enzymatic activity-tunable molybdenum oxide nanourchins (MoO3–x NUs), which selectively perform therapeutic activity in tumor microenvironment via cascade catalytic reactions, while keeping normal tissues unharmed due to their responsive biodegradation in physiological environment. Specifically, the MoO3–x NUs first induce catalase (CAT)-like reactivity to decompose hydrogen peroxide (H2O2) in tumor microenvironment, producing a considerable amount of O2 for subsequent oxidase (OXD)-like reactivity of MoO3–x NUs; a substantial cytotoxic superoxide radical (·O2–) is thus generated for tumor cell apoptosis. Interestingly, once exposed to neutral blood or normal tissues, MoO3–x NUs rapidly lose the enzymatic activity via pH-responsive biodegradation and are excreted in urine, thus ultimately ensuring safety. The current study demonstrates a proof of concept of biodegradation-medicated in vivo catalytic activity-tunable nanozymes for tumor-specific cascade catalytic therapy with minimal off-target toxicity.
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Polymers
·
2019
·Vol. 11
·期 12
·2005
·
IF 3.164
Jizhen Tian,Jincheng Mao,Wenlong Zhang,Xiaojiang Yang,Chong Lin,Meng Cun,Jinhua Mao,Jinzhou Zhao
ZID16PM, a zwitterionic hydrophobic associating polymer, has equivalent positive and negative charges and some hydrophobic monomers with twin-tailed long hydrophobic chains. It exhibits a great heat resistance and salt tolerance to the common salt in formation brine (MgCl2, CaCl2, NaCl, and KCl), which is attributed to its anti-polyelectrolyte effect and strong association force. High-salinity water (seawater or formation water) can be prepared as a fracturing fluid directly. In this paper, the formation water of the West Sichuan Gas Field is directly prepared into fracturing fluid with a concentration of 0.3% ZID16PM (Fluid-1), and the seawater of the Gulf of Mexico is directly prepared into fracturing fluid with a concentration of 0.3% ZID16PM (Fluid-2). Finally, rheological measurements, proppant suspension tests, and core matrix permeability damage rate tests for the Fluid-1 and Fluid-2 are conducted. Results show that after 120 min of shearing at 140 and 160 °C, respectively, the viscosity of Fluid-1 remains in the range of 50–85 mPa·s, and the viscosity of Fluid-2 remains in the range of 60–95 mPa·s. And the wastewater produced by an oilfield in Shaanxi, Xinjiang, and Jiangsu are also prepared into fracturing fluids with a concentration of 0.3% ZID16PM, the viscosity of these fracturing fluids can remain 32, 42, and 45 mPa·s, respectively, after 120 min of shearing at 160 °C. All results demonstrate that the polymer ZID16PM displays prominent performance in fracturing fluids.Keywords:zwitterionic hydrophobic associating polymer;salt effect;fracturing fluid system;high-salinity water;oilfield wastewater
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JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2019
·
IF 2.886
Qingfeng Hou,Yuanyuan Wang,Zhe Wang,Qi Wu,Fan Wang,Chen Ni,Xiaobo Zheng,Yan Xu,Yujun Zhao
In this study, a series of CO 2 -switchable acetamidines surfactants with different hydrophobic tail groups were synthesized using N, N-dimethylacetamide dimethyl acetal and different aliphatic amines. The conductivity assessment demonstrated the exceptional CO 2 -switchable performance of these surfactants. It was believed this switchability mainly resulted from the activity of acetamidine groups which could react with CO 2 to form the amphiphilic acetamidine carbonate. For this reason, the protonation during CO 2 bubbling of acetamidine surfactants with longer hydrophobic tail was more likely to occur at higher temperature due to the improved solubility. It was also found that acetamidines containing shorter hydrophobic tail tend to be more temperature-insensitive in the protonation process. However, as for the deprotonation process (N 2 bubbling), the as-formed acetamidines bicarbonates with short hydrophobic tails displayed evident temperature sensitivity, and thus higher temperature favored the regeneration of acetamidines. Additionally, the acetamidine bicarbonates with longer hydrophobic tails showed remarkable surface activity in the hexadecane/water emulsion than those with shorter hydrophobic tails. Furthermore, higher temperature and longer standing time accelerated the N 2 -triggered demulsification and the recovery of oil phase. The temperature sensitivity could allow these acetamidines to be deployed in CO 2 -triggered enhanced oil recovery (EOR).
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FUEL
·
2019
·
IF 5.128
Feifei Li,Xiaodong Wang,Hui Pan,Qiuye Li,Jianjun Yang
In this paper, disk-like α -Fe 2 O 3 nanoparticles were synthesized by one-step via an n-octyl alcohol-mediated self-assembly process and were subsequently used as the catalyst for the updating of heavy crude oil. The characterization results show that the diameter of the as-prepared α -Fe 2 O 3 disks is in the range of 150–200 nm and the nanoparticles have a hematite structure with [1 1 0] preferred orientation. The catalyst strongly acts on the asphaltene and causes its lower S content and N content, lower aromaticity and aromatic condensation, and higher branchiness index. Adding tetralin causes the increment of aromatics content, the decrease of resin, and more molecules containing aromatic moieties bearing 2 and 3 rings. The viscosity of the Shengli extra heavy oil reduced substantially from 161180 mPa∙s to 45882 mPa∙s (50 °C) through the combination of the α -Fe 2 O 3 nanoparticles and tetralin (a hydrogen donor).
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Journal of Physical Chemistry C
·
2019
·
IF 4.309
Keyang Yin,Dandan Lu,Liping Wang,Quanxin Zhang,Junying Hao,Gaozhan Li,Hongguang Li
In the preparation of carbon dots (C dots) through pyrolysis, organic molecules with multiple functional groups are popular, and monosubstituted compounds, such as aliphatic amines, are used only as an auxiliary component. Here, we provide a strategy to transfer aliphatic amines and aliphatic aldehydes to C dots in the absence of any other reagent under mild conditions. In a typical experiment, C dots were facilely obtained by refluxing dodecylamine (C12–NH2) in chlorobenzene, which shows blue emission with wavelength-dependent characteristics. The C dots are soluble in a variety of organic solvents and can be further processed by either gel permeation chromatography or silica gel column chromatography, which gives highly pure C dots with absolute fluorescence quantum yield over 10%. The C dots are photoluminescent in the solvent-free state and can be used as fluorescent ink. They are also compatible with polymers such as poly(methyl methacrylate) and polydimethylsiloxane. Influence of the type of functional group was checked. Blue-emitting C dots were obtained as well by refluxing dodecanal in chlorobenzene, but using a compound bearing a carboxylic or hydroxy group only showed little success.
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