JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 22
·15430-15441
·
IF 2.993
Zhenfu Zhao,Liang Jing,Zhihai Wu,Jiong Cheng,Miaomiao Zhang,Yafei Hou
Halide perovskite quantum dots (PQDs) have been intensively studied because of their superior optical properties and have great potential applications in laser, display technology and light-emitting diodes (LEDs). Presently, high-efficiency green emissive CH 3 NH 3 PbBr 3 PQDs have been successfully fabricated. However, the synthesis of stable iodide-based CH 3 NH 3 PbX 3 (MAPbX 3 (X = Cl, Br, I), MA = CH 3 NH 3 ) QDs still faces significant challenges because they are sensitive to the moisture in open air. Herein, we investigated the effect of the solvent and ligand on the growth of the as-prepared MAPbBr 3 and MAPbI 3 sample, mainly involved in the volume ratio of N , N -dimethylformamide (DMF) and γ-butyrolactone (GBL) and the amount of n -octylamine in toluene. The results show that the low volume ratio of DMF and GBL is beneficial to prepare highly luminescent, stable and full-colored MAPbX 3 PQDs in open air. Besides, the PL emission peak of MaPbBr 3 PQDs can be adjusted from 430 to 513 nm via precisely controlling the amount of n -octylamine in toluene because of quantization. The obtained MAPbX 3 PQDs show high quantum yield and a wide range of tunable light emission from ultraviolet to near-infrared region. The MAPbX 3 PQDs, especially iodide-based MAPbX 3 PQDs, obtained from this method remain stable more than 3 months at ambient condition. We further demonstrated the multi-colored LEDs by using different color emissive MAPbX 3 PQDs as color converters and being subjected to excitation through a blue GaN chip. Furthermore, MAPbX 3 PQDs are expected to show interesting nanoscale optical properties and have great potential applications in electroluminescence devices, lasers and optical sensors.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 24
·20808-20819
·
IF 2.324
Zhao Ji,Zhao Dan,Liu Bao-Zhong,Xue Ya-Li,Fan Yan-Ping,Zhang Shi-Rui,Zong Qiu
A new member of rare-earth orthoborate K 3 Gd 3 B 4 O 12 was prepared by a flux method and structurally characterized by single-crystal structure analysis for the first time. It features a two-dimensional layer structure containing [Gd 8 (BO 3 ) 8 ] ∞ layers parallel to the ab -plane. Gd(3)O 7 groups, B(3)O 3 groups, B(4)O 3 groups and large K + ions distribute in between the[Gd 8 (BO 3 ) 8 ] ∞ layers, and bond adjacent layers. Theoretical researches by density functional theory (DFT) revealed that the compound K 3 Gd 3 B 4 O 12 is an indirect band-gap semiconductor and the optical absorption can be mainly ascribed to O→K, O→Gd and O→B charge transfers. Moreover, a series of K 3 Gd 3− x − y B 4 O 12 : x Tb 3+ , y Eu 3+ phosphors were prepared, their morphology and tunable multicolour emission properties were studied. Under UV or near-UV excitations the luminescence colours will tune from green through yellow, orange to red by simply adjusting the relative Tb 3+ and Eu 3+ concentrations.
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高影响因子
Journal of the Iranian Chemical Society
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2018
·Vol. 16
·期 2
·385-392
·
IF 1.593
Xu Wenjing,Chen Yizhen,Kang Jianxun,Li Baojun
The hybrid nanocomposites ZIF@L composed of Zn-based MOFs (ZIF-8) and lignin were successfully synthesized via a simple one-step method at room temperature. The yield of the hybrid nanocomposites ZIF@L were up to 52% and the synthesis time was greatly shortened. Characterization using FT-IR, XRD, SEM and N 2 -sorption analysis indicated that ZIF@L composites exhibited rhombic dodecahedral structure such as the parent ZIF-8 synthesized in the absence of lignin and the incorporation of lignin did not destroy the framework integrity of ZIF-8. The ZIF@L composites were used to remove methyl violet (MV). The ZIF@L nanocomposites had a remarkable improvement in adsorption capacity of MV compared with the parent ZIF-8. The modified Langmuir model fitted better the equilibrium data of MV adsorption on the ZIF@L-4 composite and the maximum adsorption capacity of MV is 1001.2 mg g −1 . The pseudo-second-order model could describe well the kinetics process of MV dye onto the prepared adsorbents.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2241-2255
·
IF 2.993
Ma Jing,He Yi,Shi Heng,Fan Yi,Yu Hao,Li Yubin
Graphene oxide (GO) membranes have great potential in separation technology. However, their instability under aqueous environments hinders their separation performance and practical application. Herein, we present a facile and environmentally friendly method to fabricate stable GO-based membranes via the intercalation of montmorillonite (MMT) nanoplatelets. The as-prepared membranes remain stable under water (neutral, acidic, and alkaline) in a fully hydrated state and exhibit a high pure-water flux up to 139.5 L·m −2 ·h −1 under 0.09 MPa. Furthermore, they also show high organic molecule rejection (98.75% for Congo red, 99.44% for rhodamine B, 99.90% for crystal violet, 99.94% for methylene blue, 96.26% for phenanthracene, and 51.32% for phenol) as well as good removal rate of heavy metal ions (100% for Ag(I), 100% for Cu(II), and 27.04% for Cr(VI)). Moreover, an outstanding recycling ability of the membranes also has been obtained. These significant performances make our membranes a good candidate in water purification.
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高影响因子
Food Analytical Methods
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2018
·Vol. 11
·期 12
·3283-3292
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IF 2.245
Du Li-Jing,Jiao Yan-Hua,Ye Li-Hong,Fei Ting-Hong,Wang Qiu-Yan,Hu Yu-Han,Cao Jun,Zhang Qi-Dong,Peng Li-Qing,Chen Yu-Bo
A fast, simple, and cost-effective miniaturized solid-phase extraction method using calixarenes as adsorbent was developed for the micro-extraction of cyanazine, simazine, atrazine, and propazine from complex samples. The ultrahigh-performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry was employed for the structural identification of target compounds. The parameters affecting the performance of extraction, such as the type of sorbents, the amount of the sorbent, desorption solvents, breakthrough volume, and adsorption capacity, were optimized. Under optimal conditions, the linear range was 6–600 ng mL −1 with the coefficients of determination from 0.9943 to 0.9998. The limits of detection and quantification for the four triazines were 0.01–0.04 and 0.04–0.15 ng mL −1 , respectively. The proposed method was successfully used to determine triazine herbicides in the honey and milk samples.
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高影响因子
FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 4
·703-710
·
IF 1.353
Jiang Huiyu,Wang Yujiao,Quan Heng,Li Wei
Waterborne polyurethane modified by acrylate/nano-ZnO (PUA/ZnO) was synthesized and used to improve the wet rubbing fastness of reactive dyed cotton fabric. The reaction conditions were optimized and the products were characterized by FT-IR, TG, DSC, SEM, and particle size distribution. The dyed cotton fabrics were finished with PUA/ZnO emulsion and the rubbing fastness, ultraviolet resistant property, and wearability of treated fabrics were measured. The wet rubbing fastness of treated fabrics was increased by about 0.5–1 rate to achieve 3–4 rate, and the ultraviolet protection factor (UPF) achieved 50+ level. The whiteness, air permeability, and elongation at break of treated fabric were not decreased significantly. SEM showed that the smooth and reticular coating on the surface of treated fabric reduced the mechanical friction force between dyed fabric and rubbing cloth, and thus improved the rubbing fastness. The decomposition temperature of finished fabric was increased by 50–80 °C.
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高影响因子
FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 4
·821-831
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IF 1.353
Zhang Bin,Meng Yang,Han Jian
A simple and facile method for fabricating the cotton fabric with superhydrophobicity, self-cleaning and flame retardancy was described in the present work. Three types of antimony pentoxide sol (Sb 2 O 5 ), aluminum hydroxide sol (Al(OH) 3 ) and 1H,1H,2H,2H-perfluorodecyltriethoxysilane (fluoroalkyl silanes) were used as coating for the cotton fabric. It was found that Sb 2 O 5 and Al(OH) 3 exhibited significant synergistic effects on the flame retardancy. When the weight ratio of Sb 2 O 5 /Al(OH) 3 (content 30 wt%) was 1:3, the results showed that the limiting oxygen index (LOI) value was 45.1 %, smoke density (SDR) value was 35 %, and it still passed UL94 V-0 rating. The cotton fabrics coated with fluoroalkyl silanes/Sb 2 O 5 / Al(OH) 3 showed a superhydrophobicity, anti-contamination and self-cleaning properties. In addition, the results exhibited the outstanding superhydrophobicity, oil/water separation, excellent waterproofing durability and flame retardancy of cotton fabric after 1000 cycles of washing by water, the LOI value was 40.1 %, SDR value was 39 % and WCA was 152° after 1000 cycles of washing. We believe that this simple, environmentally friendly and versatile fabrication of the cotton fabric had excellent real-life applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 20
·14456-14468
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IF 2.993
Dou Qianqian,Wong Ka Wai,Li Yang,Ng Ka Ming
The localized surface plasmon resonance (LSPR) behavior of indium-doped ZnO (IZO) nanocrystals synthesized in different solvents was studied. 1-octadecanol, oleic acid, oleyl alcohol, oleyl amine and 1-octadecene were used as solvent(s) and co-solvent(s) in the pyrolysis synthesis of indium-doped ZnO (IZO) nanoparticles. The results showed that the nanocrystals from a solvent system consisting of 1-octadecene, 1-octadecanol, and oleic acid exhibited enhanced LSPR near-infrared radiation absorption without sacrificing transparency in the visible region. The indium-rich core verified using ICP and XPS analysis was shown to be critical for the enhancement. The reaction mechanism of solvents on the generation of indium-rich core was elucidated through a systematic study of the reaction parameters. The interaction between the activating agent, inhibiting agent and solvent, and their effect on tuning the reactivity of dopant and host precursors were important for the formation of a nanostructure with a dopant-rich core. The solvent effect was also found in the synthesis of gallium-doped ZnO and confirmed to be a general phenomenon in the preparation of doped ZnO nanoparticles.
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高影响因子
SN Applied Sciences
·
2018
·Vol. 1
·期 1
·1-11
·
IF 0
Huang Yangfan,Zhu Jiameng,Liu Huie,Wang Zhenyou,Zhang Xiuxia
The graphene oxide (GO) and modified carbon nanotubes (MCNTs) were dispersed in water and mixed with toluene to form homogeneous emulsion, then the porous graphene–carbon nanotubes composites (MCG) were prepared through hydrothermal reaction. The adsorption mechanism of MCG was investigated by adsorption methylene blue. The morphology of MCG was analyzed by scanning electron microscope and transmission electron microscopy. It was found that MCG had rich micropore structures and MCNTs were interlaced on graphene sheets. The pore size of MCG can be effectively controlled by changing the volume ratio of toluene to the GO/MCNTs solution in the emulsion. MCG was characterized by X-ray diffractometer, Raman spectrometer, X ray photoelectric instrument and other analytical instruments. It was found that MCG had more oxygen functional groups. The experimental results show that kinetics can be well-described by pseudo-second-order model. The smaller the pore size, the higher the equilibrium adsorption capacity and the slower the adsorption rate. The adsorption thermodynamic parameters show that the adsorption process is spontaneous and belongs to physical adsorption, and high temperature is beneficial to adsorption. The fitting results of MCG-5 equilibrium adsorption data are matched with the Langmuir model and the saturated adsorption capacity is 232 mg g −1 . After five cycles of adsorption–desorption operation, the adsorption capacity of MCG-5 decreases slightly.
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NPG Asia Materials
·
2018
·Vol. 10
·期 11
·1046-1060
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IF 7.208
Li Tianliang,Zhou Jia,Zhang Chunlei,Zhi Xiao,Niu Jiaqi,Fu Hualin,Song Jie,Cui Daxiang
Active drug-loaded nanocarriers have been widely employed as efficient drug delivery systems for tumor theranostics. Herein, we report folate-mediated “all-in-one” nanobubbles for tumor-targeted NIR/MR/US imaging and combined chemo-photothermal therapy. The surface-engineered nanobubbles are constructed from oleylamine-/IR-780-loaded hollow structures, folate and the Gd DTPA-BSA@5-FU complex via electrostatic adsorption and further filled with gas after freeze drying. DLS data show that the nanobubbles have a hydrodynamic diameter of 120.41 ± 18.30 nm. TEM observations show a hollow inner cavity and a shell thickness of approximately 10 nm. The relaxivity (r1) of the nanobubbles reaches 16.56 s −1 /mM, indicating suitable features for use as a T1-weighted MR contrast agent. Moreover, due to the gas core inside, the nanobubbles are suitable for ultrasound contrast imaging. Interestingly, ξ-potential data and cumulative release measurements demonstrate that the nanobubbles undergo charge-switchable behaviors and pH-/light-sensitive drug-release behaviors after surface engineering, which could facilitate deep tumor penetration and accelerate drug release for efficient killing of cancer cells. In vivo trimodal imaging and chemo-photothermal therapy for MGC-803 tumor-bearing mice reveal selective tumor accumulation, long tumor retention, and enhanced antitumor behaviors. Therefore, the all-in-one nanobubbles could be applied for active tumor-targeting theranostics.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2018
·Vol. 12
·期 3
·346-357
·
IF 2.643
Zhang Chao,Lu Chenbao,Bi Shuai,Hou Yang,Zhang Fan,Cai Ming,He Yafei,Paasch Silvia,Feng Xinliang,Brunner Eike,Zhuang Xiaodong
Porous polymers have been recently recognized as one of the most important precursors for fabrication of heteroatom-doped porous carbons due to the intrinsic porous structure, easy available heteroatom-containing monomers and versatile polymerization methods. However, the heteroatom elements in as-produced porous carbons are quite relied on monomers. So far, the manipulating of heteroatom in porous polymer derived porous carbons are still very rare and challenge. In this work, a sulfur-enriched porous polymer, which was prepared from a diacetylene-linked porous polymer, was used as precursor to prepare S-doped and/or N-doped porous carbons under nitrogen and/or ammonia atmospheres. Remarkably, S content can sharply decrease from 36.3% to 0.05% after ammonia treatment. The N content and specific surface area of as-fabricated porous carbons can reach up to 1.32% and 1508 m 2 ∙g –1 , respectively. As the electrode materials for electrical double-layer capacitors, as-fabricated porous carbons exhibit high specific capacitance of up to 431.6 F∙g –1 at 5 mV∙s –1 and excellent cycling stability of 99.74% capacitance retention after 3000 cycles at 100 mV∙s –1 . Furthermore, as the electrochemical catalysts for oxygen reduction reaction, as-fabricated porous carbons presented ultralow half-wave-potential of 0.78 V versus RHE. This work not only offers a new strategy for manipulating S and N doping features for the porous carbons derived from S-containing porous polymers, but also paves the way for the structureperformance interrelationship study of heteroatoms codoped porous carbon for energy applications.
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FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 9
·1850-1860
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IF 1.353
Bismark Sarkodie,Zhu Zhifeng
The objectives of this work were to survey the effect of amphipathic modification of starch on the adhesion to cotton fibers for improving the adhesion of starch to cotton in warp sizing. The amphipathic starch (AS) with oleophilic octenylsuccinate and hydrophilic phosphate substituents was prepared by the phosphorylation with sodium tripolyphosphate (STP) followed by the octenylsuccinylation with 2-octenylsuccinic anhydride (OSA). Two series of AS samples with differential total degrees of substitution ( DS t ) and substituent ratios of phosphates to octenylsuccinates were evaluated by fourier transform infrared (FTIR) analysis, degree of substitution, adhesion to cotton and surface tension. The adhesion of the starch to fibers was investigated using a legal method (FZ/T 15001-2008). The FTIR spectra revealed that octenylsuccinates and phosphates have been attached to the backbones of the starch. The amphipathic modification of starch with STP and OSA was an effective method to enhance the adhesion of corn starch to cotton. The strong adhesion of the AS to cotton was attributed to the reduced surface tension arisen from oleophilic octenylsuccinate and hydrophilic phosphate substituents and increased steric hindrance of the substituents introduced onto starch. The investigation showed that the improvement in the adhesion of the starch after amphipathic modification could be buttressed by the tensile strength of cotton yarns sized with AS. It was found that the AS was desizable and showed satisfactory desizing efficiency in oxidant desizing. Based on the adhesion, reaction efficiencies, and desizability, the AS with a total DS t of 0.033 and a substituent ratio of DS p 0.014/ DS o 0.032 showed potential for use in warp sizing.
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高影响因子
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