CERAMICS INTERNATIONAL
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2018
·
IF 3.057
Mingye Ding,Zheyan Shen,Yongjun Yuan,Wangfeng Bai,Chunhua Lu,Zhenguo Ji
β-NaYF 4 :Yb 3+ /Er 3+ nanocrystals embedded transparent glass ceramic has been successfully fabricated by direct incorporation of hydrophilic upconversion nanoparticles (UCNPs) into sol-gel silica glass and subsequent heat treatment. The temperature-sensitive upconversion luminescent behaviors of the as-fabricated UCNPs-silica glass ceramic are systemically investigated in order to investigate its potential application as luminescent thermometric medium. Impressively, benefiting from low-phonon-energy environment, highly UC emission for erbium ions in β-NaYF 4 nanophase and high transparency, good chemical/mechanical stability of the oxide glass matrix, the investigated glass ceramic has superiorities of high relative temperature sensitivity (~ 1.16% K −1 ) and excellent thermal stability for accurate temperature sensing. This preliminary study not only provides a reference for fabricating other transparent bulk glass ceramics containing highly luminescent nanomaterials , but also exploits an effective approach for developing high-performance luminescent thermometers.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 54
·期 6
·4589-4600
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IF 2.993
Tan Jiabin,He Xiaobo,Yin Fengxiang,Liang Xin,Chen Biaohua,Li Guoru,Yin Huaqiang
In this study, a β-Mo 2 C/N, P-co-doped carbon (NPC) catalyst with a porous structure of β-Mo 2 C nanoparticles loading on NPC matrix was prepared by vacuum-rotary evaporation and followed by a facile pyrolysis process for hydrogen evolution reaction (HER). The porous structure is beneficial for exposing more active sites and the mass transfer during the HER. In addition, the carbon matrixes with the highly doped N and P heteroatoms also provide their positive contributions to its high catalytic activity for HER. Owing to the advantages mentioned above, the optimized catalyst shows a small overpotential of 181 mV for driving a cathodic current density of 10 mA cm −2 , a low Tafel slope of 65.3 mV dec −1 and a high exchange current density of 1.5 × 10 −2 mA cm −2 during HER processes in acid electrolyte. The excellent performance of the β-Mo 2 C/NPC makes it a great potential candidate as the HER electrocatalyst.
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高影响因子
MATERIALS RESEARCH BULLETIN
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2018
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IF 2.873
Zhangxu Chen,Ming-Lai Fu
To extend the activities of TiO 2 to the near infrared (NIR) region and to separate and recycle photocatalysts easily is vital for the high harvest of solar energy for sustainable society. The magnetic NIR activated Fe 3 O 4 @SiO 2 /β-NaYF 4 :Yb 3+ ,Tm 3+ /TiO 2 (FS/UC/T) composites have been synthesized by using the solvothermal method by adding Fe 3 O 4 @SiO 2 and Degussa P25 into the mixed solution of NaOH, ethanol, oleic acid, Re(NO 3 ) 3 and NH 4 F. Moreover, the obtained composites were explored for photocatalytic applications. It was found that FS/UC/T emit UV–vis light under irradiation of 980 nm laser and efficient energy transfer from β-NaYF 4 :Yb 3+ ,Tm 3+ to TiO 2 was verified. The photodegradation experiments for treating methylene blue (MB), rhodamine B (RhB), methyl orange (MO) and colorless phenol were carried out to evaluate the photocatalytic activities of the samples. The photodegradation rates reach 76.62%, 68.48%, 30.05% and 27.16% for MB, RhB, MO and phenol under irradiation of 980 nm laser, respectively, which suggested magnetic FS/UC/T composite is an advanced NIR-driven photocatalyst. Moreover, the magnetic photocatalyst showed easy separation and good stability in the recycled tests. It suggested a promising system to utilize the NIR energy for photocatalysis based on TiO 2 and to utilize the magnetic for separation of photocatalysts, which will contribute to practical environmental remediation in the future.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Ping Xiao,Song Ye,Huazhen Liao,Deping Wang
In this work, the monodisperse spherical pure β-NaYF 4 :Yb 3+ ,Er 3+ core NCs with average size of 7.2 nm were synthesized by using NaOA as sodium source instead of the conventional NaOH, based on which the sub-20 nm β-NaYF 4 :Yb 3+ ,Er 3+ @NaGdF 4 core-shell NCs with magnetic-optical bifunctional properties were successfully obtained with seed-mediated growth method. The magnetization of the core-shell NCs enhanced proportionally with increased shell thickness, and the maximum upconversion intensity was three orders of magnitude increased in the 18.3 nm NaYF 4 : Yb 3+ ,Er 3+ @NaGdF 4 core-shell NCs compare with the corresponding core NCs. Besides, the upconversion mechanism for the core and core-shell NCs were discussed. This work may lead to an ideal platform for the preparation of sub-20 nm spherical NCs with magnetic and optical properties for application in biomedical imaging and drug delivery.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Liqin Zhou,Zhijun Xu,Kai Yi,Qiuyuan Huang,Kungang Chai,Zhangfa Tong,Hongbing Ji
The water contamination by 2,4-dichlorophenol (2,4-DCP) is a tough environmental problem, so its removal has aroused much attention recently. In this study, the synthesis of a β-cyclodextrin-based submicron polymeric particles (CSPs) is described along with its utilization as adsorbent for the remediation of 2,4-dichlorophenol (2,4-DCP) from aqueous solution. Morphology and structural characterization illustrated the microstructure evolution of the aggregated CSPs with different catalytic doses. Using CSPs obtained under optimum conditions as sorbent, the adsorption performance for 2,4-DCP was systematically studied. The adsorption process fitted well the pseudo-second-order model and the Freundlich model, and thermodynamic studies manifested that the adsorption was a spontaneous and exothermic process. The slightly acidic and neutral pH as well as inorganic ions co-existence were found to be favorable for adsorption of 2,4-DCP onto CSPs. Further, CSPs had superior affinity for 2,4-DCP from aqueous media containing other analogues (2-chlorophenol and phenol). The comprehensive analysis of experimental and theoretical results suggested that the π–π, hydrophobic, and hydrogen bonding interactions may jointly drive the uptake process of 2,4-DCP. Thus, CSPs even with low surface-area showed high adsorption capacity for 2,4-DCP compared with activated carbon and other adsorbents. Also, CSPs displayed excellent structural stability and reversibility after 5 cycles of adsorption experiments. Considering the simple fabrication method employed, excellent 2,4-DCP adsorption capacity, remarkable structural stability, and reusability, CSPs provided an alternative platform for the remediation of 2,4-DCP from aqueous solution.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 48
·46885
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IF 1.901
Yu Cao,Jiayu Li,Jun Liu,Yuying Tang,Huan Liu,Yan Jiang,Hongwen Zhang
Four inclusion complexes were synthesized from β-cyclodextrin (β-CD) copolymers and potassium sorbate (PSA) using the self-assembly principle. Reactive β-CD monomers carrying unsaturated ester functional groups [β-CD-acryloyl chloride (AC)] were synthesized from β-CD and AC and copolymerized with styrene to obtain β-CD copolymers of the general formula poly(β-CD-AC- co -St). These β-CD copolymers having cavity structures were complexed with PSA to obtain the corresponding inclusion complexes of the general formula poly(β-CD-AC- co -St)/PSA. These complexes were added to the polystyrene (PS) sheets, as an antibacterial additive, to inhibit the adhesion and growth of bacteria on its surface. The chemical and physical structures of copolymers were characterized by Fourier transform infrared, nuclear magnetic resonance, and the slow release performance was investigated using ultraviolet spectroscopy. The results showed that the composition of the copolymers and their molecular weight could be controlled by changing the rate of charge while the rate and the amount of slow release could be controlled by altering the content of β-CD in the copolymer. The PS sheets containing the inclusion complexes exhibited excellent antibacterial activity that significantly reduced the adhesion of yeast and Staphylococcus aureus to its surface. With the increase of the β-CD content in the copolymers, they contained more of PSA and their bacteriostatic property became more pronounced. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46885.
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高影响因子
LANGMUIR
·
2018
·
IF 3.789
Dongmei Zhang,Cheng Yang,Ziru Niu,Changhao Wang,Somnath Mukherjee,Dan Wang,Xi Li,Ruiqi Liu,Jin Gao,Yashao Chen
Promoting a drug inclusion proportion in hydrophobic cavity of β-cyclodextrin using simple methods is a highly ambitious task. Herein, we report the crowning β-cyclodextrins formed by intramolecular hydrogen bonding interaction, which has greatly prolonged the cavity depth of β-cyclodextrin, and therefore further efficiently improved the inclusion proportion to complex drug molecule (vitamin E). Furthermore, the self-assembly behaviors, controllable release, and antioxidant properties of vitamin E embedded into the cavity of crowning β-cyclodextrins was investigated, and host–guest inclusions exhibited temperature-responsive controlled release, excellent antioxidant activity, and photostability.
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PubMed
高影响因子
ELECTROANALYSIS
·
2018
·Vol. 30
·期 10
·2467-2474
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IF 2.851
Zhaoxia Shi,Jie Tan,Yufei Hu,Gongke Li,Xiaohua Xiao
In this work, graphene oxide/β-cyclodextrin (GO/β-CD) composite was synthesised and applied to construct a highly sensitive electrochemical sensor for the determination of propyl gallate (PG) and butyl hydroxy anisole (BHA) in edible oil, simultaneously. Various methods were used to characterize the properties of GO/β-cyclodextrin composite. Furthermore, the oxidation peak currents of PG and BHA were increased obviously at the modified glassy carbon electrode, which improved the sensitivity of proposed method. Under optimal conditions, the peak currents of PG and BHA increased linearly with its concentration in the range of 0.1–30.0 μmol/L and 0.05–30 μmol/L, respectively. The limit of detections were as low as 0.01 μmol/L and 0.03 μmol/L, respectively. Finally, the sensor was successfully applied to edible oil sample analysis. The recoveries varied from 95.3 % to 108.6 % with the RSDs 2.9 %–4.9 %, indicated that the proposed sensor can be used for the simultaneous determination of PG and BHA in edible oil.
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Journal of Materials Chemistry B
·
2014
·Vol. 3
·期 2
·316-322
·
IF 0
Wen-Xing Gu,Mingran Zhu,Nan Song,Xiaoxu Du,Ying-Wei Yang,Hui Gao
A series of linear and star-shaped amphiphilic polyethylene glycol block polylactide (PEG-b-PLA) and β-cyclodextrin (CD) conjugated PEG-b-PLA (PEG-b-PLA-CD) copolymers were synthesized. Bovine serum albumin (BSA) aqueous solution was emulsified in the copolymer organic solutions to fabricate reverse micelles (RMs), and was then further transferred into ethyl oleate (EO), a pharmaceutically acceptable vehicle, by the RMs. As identified by 1H NMR, the RMs were formed with a hydrophilic core of PEG and CD, covered with a hydrophobic corona of PLA moiety, and were spherical in shape, as observed by a scan electronic microscope. Compared with the PEG-b-PLA RMs, the PEG-b-PLA-CD RMs presented higher encapsulation efficiency. The release of BSA was influenced by the copolymer composition and architecture. BSA stability in the release aqueous phase was confirmed by circular dichroism spectroscopy. The oil-based formulation fabricated from biodegradable copolymers with high drug loading showed a great potential for protein delivery.
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PubMed
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 12
·
IF 1.64
Xi-Xiang Deng,Zhong Chen,Qiang Huang,Xiong Fu,Chuan-He Tang
Microencapsulation is an effective strategy to improve the storage stability of β - carotene. This article investigated the potential and effectiveness of soy protein isolate (SPI) and octenylsuccinic anhydride-modified starch (MS), alone or in combination (1:1, w/w), to encapsulate β - carotene by spray drying. The results indicated that the microcapsule with MS exhibited much lower encapsulation efficiency (NE) and poorer dissolution behavior, but much better redispersion behavior, than that with SPI or its blends with MS. The NE was basically unaffected by total solid content (TC) or core/wall ratio; increasing the TC impaired the dissolution and/or redispersion behavior. The dispersion behavior was closely associated with the morphology of the microcapsules. The encapsulated β - carotene suffered a progressive loss upon storage under high humid or temperature environment, but it exhibited extraordinary stability at low temperatures (e.g., 4°C). The β - carotene degradation was independent of sunlight. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40399.
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高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 6
·1736-1742
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IF 1.938
Shiquan Xiong,Junjie Cheng,Lulu He,Min Wang,Xin Zhang,Zhengyan Wu
A β-cyclodextrin–graphene (β-CD–G) hybrid composite modified glassy carbon electrode for the first time was used for electrochemically detecting di(2-ethylhexyl)phthalate (DEHP), based on the inclusion of DEHP into β-CD. The electrode was characterized by cyclic voltammetry and electrochemical impedance spectroscopy. At the composites electrode, the impedance value increased linearly with the increasing DEHP concentration in the range of 2 μM to 18 μM, the limit of detection was 0.12 μM (3σ method), with a correlation coefficient of 0.998. The electrode showed good selectivity, reproducibility and stability. Obviously, the collected amounts of DEHP by β-CD–G could be detected through this electrochemical method. Furthermore, this simple and low-cost sensing platform can in principle be extended to the detection of other phthalate esters which can form host–guest complexes with cyclodextrin.
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高影响因子
ELECTROANALYSIS
·
2015
·Vol. 28
·期 4
·868-873
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IF 2.138
Juanjuan Xu,Qinghong Wang,Chunzhi Xuan,Qiao Xia,Xia Lin,Yingzi Fu
The nanohybrids which based on β-cyclodextrin, platinum nanoparticles and graphene (β-CD-PtNPs/GNs) were successfully synthesized and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FT-IR) and electrochemical impedance spectroscopy (EIS). Then they were used to construct a simple and reliable chiral sensing platform to interact with tryptophan (Trp) enantiomers. Differential pulse voltammetry (DPV) was used to investigate the stereo selectivity of β-CD-PtNPs/GNs to Trp enantiomers. After interaction, the obvious difference of peak currents of L -Trp and D -Trp was obtained, indicating this strategy could be employed to chiral recognition of Trp enantiomers. Under the optimum conditions, the chiral sensor exhibited a good linear response to Trp enantiomers in a linear range of 5.0×10 −5 to 5.0×10 −3 M with a low limit of detection of 1.7×10 −5 M (S/N=3). This approach provided a new available platform to recognize and determine Trp enantiomers.
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