INORGANIC CHEMISTRY
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2016
·
IF 4.82
Chade Lv,Gang Chen,Jingxue Sun,Yansong Zhou
The creation of a phase junction structure in photocatalysts is a wise approach to promote photocatalytic performance, as phase junctions possess the potential to inhibit the recombination of photoinduced charge carriers. Here, Bi4V2O11 nanofibers with an α–β phase junction are fabricated via electrospinning with subsequent calcination. Electrospinning offers the opportunity to keep α-Bi4V2O11 from transforming into β-Bi4V2O11 completely due to an electrospinning retardation effect, leading to the formation of an α–β Bi4V2O11 phase junction. Furthermore, the α–β Bi4V2O11 phase junction realizes a well-established type-II band alignment. Photoelectrochemical measurements and photoluminescence spectroscopic investigations demonstrate that the phase junction structure has a significant impact on the separation and transfer of photogenerated electrons and holes. Thus, the α–β phase junction on Bi4V2O11 holds the key to achieving promoted efficiency in the photocatalysis process.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Le Zhang,Xin Zhou,Shaohua Chai,Jian Guan,Guijun Fan,Wuxinchen Yang,Guojun Ma,Ning Han,Yunfa Chen
There is a high demand to synthesize ozone decomposition catalysts especially in high-space-velocity and high-relative-humidity (RH) environments. Herein, two polymorphs of cobalt hydroxide, α- and β-Co(OH)2, are synthesized and applied for ozone elimination. β-Co(OH)2 shows ∼90% ozone decomposition efficiency under high space velocity (weight hourly space velocity (WHSV) = 1,200,000 mL g–1 h–1, 25 °C, 40 ppm), which is far higher than that of α-Co(OH)2 (∼5%). β-Co(OH)2 has high spin Co(II) in distorted octahedral coordination caused by the Jahn-Teller effect, leading to a higher crystal field splitting energy level and thus contributing to the easier electron transfer between the ozone and catalyst. Moreover, β-Co(OH)2 still shows high performance (∼87%) even in humid conditions (RH ∼50%, 25 °C, 40 ppm, WHSV = 600,000 mL g–1 h–1), which is attributable to its abundant surface non-hydrogen-bonded hydroxyls weakening water molecule adsorption, providing an idea to develop highly efficient catalysts for ozone decomposition in humid environments.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yindian Wang,Yuan Qi,Chuxuan Chen,Changwen Zhao,Yuhong Ma,Wantai Yang
Exploring a suitable immobilization strategy to improve catalytic efficiency and reusability of cellulase is of great importance to lowering the cost and promoting the industrialization of cellulose-derived bioethanol. In this work, a layered structure with a thin PEG hydrogel as the inner layer and sodium polyacrylate (PAANa) brush as the outer layer was fabricated on low density polyethylene (LDPE) film by visible-light-induced graft polymerization. Two enzymes, β-glucosidase (BG) and cellulase, were separately coimmobilized onto this hierarchical film. As supplementary to cellulase for improving catalytic efficiency, BG was in situ entrapped into the inner PEG hydrogel layer during the graft polymerization from the LDPE surface. After graft polymerization of sodium acrylate on the PEG hydrogel layer was reinitiated, cellulase was covalently attached on the outer PAANa brush layer. Owing to the mild reaction condition (visible-light irradiation and room temperature), the immobilized BG could retain a high activity after the graft polymerization. The immobilization did not alter the optimal pH and temperature of BG or the optimal temperature of cellulase. However, the optimal pH of cellulase shifts to 5.0 after immobilization. Compared with the original activity of single cellulase system and isolated BG/cellulase immobilization system, the dual-enzyme system exhibited 82% and 20% increase in catalytic activity, respectively. The dual-enzyme system could maintain 93% of carboxymethylcellulose sodium salt (CMC) activity after repeating 10 cycles of hydrolysis and 89% of filter paper activity after 6 cycles relative to original activity, exhibiting excellent reusability. This layer coimmobilization system of BG and cellulase on the polymer film displays tremendous potential for practical application in a biorefinery.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2019
·
IF 3.571
Yongkang Xi,Yuxiao Zou,Zhigang Luo,Liang Qi,Xuanxuan Lu
Lipid-based delivery systems (LBDSs) are widely applied in pharmaceuticals and health care because of the increased bioavailability of lipophilic components when they are coadministered with high-fat meals. However, how to accurately control their in vivo release and stability is still challenging. Here, after introducing the simple esterification and coprecipitation, we created the dual-functional composite ODS-β-CD-VE by the coassembly of β-cyclodextrin (β-CD), octadecenyl succinic anhydride (ODSA), and vitamin E (VE). The resulting dual-functional particle presented a uniform sheetlike shape and nanometer size. In addition, its chemical structure was clarified in detail via nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). Benefiting from the antioxygenation of VE, lipid oxidation in the ODS-β-CD-VE-stabilized Pickering emulsion was effectively inhibited. Meanwhile, pH-induced protonation/deprotonation of carboxyl groups guaranteed that the emulsions kept steady at pH ≤4 but were unsteady under neutral conditions. In this way, the lipids contained in the emulsion were protected from gastric juice and then digested and accurately released as n-3 polyunsaturated fatty acids (PUFA) in the simulated intestine environment. This strategy sheds some light on the rational and efficient construction of LBDSs for nutrient supplements and even pharmaceuticals in a living digestive tract.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Hao Tang,Ying Xu,Xianhua Cheng
In this study, Cr 3+ and Mg 2+ co-doped β-NaYF 4 :Yb 3+ /Er 3+ (NYFYE) microcrystals were synthesized for the first time by the facile hydrothermal method . Cr 3+ and Mg 2+ co-doping was confirmed to influence the structure, morphology and UCL property of NYFYE microcrystals. The growth mechanism of NYFYE microcrystals doped with different Cr 3+ and Mg 2+ was discussed in detail. With 16 mol% Cr 3+ and 4 mol% Mg 2+ co-doping into NYFYE, the UC emissions were enhanced to 7 times (green) and 4 times (red) higher than those of the undoped counterpart, and the mechanism was explored by considering the different roles of Cr 3+ and Mg 2+ , the surface quenching and concentration quenching effects. This finding suggests the co-doping of two different impurity ions may be a better approach than corresponding single impurity ion doping for morphology control and UCL intensity enhancement, which is instructive for high performance UC crystals design.
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Food Packaging and Shelf Life
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2021
·
IF 6.429
Changzhu Li,Wenqing Chen,Subramanian Siva,Haiying Cui,Lin Lin
To develop a novel food packaging material, hydroxypropyl-β-cyclodextrin (HP-β-CD) with good water solubility was used to encapsulate cinnamaldehyde (CA). The prepared CA/HP-β-CD inclusion complex (CA/HP-β-CD-IC) was further embedded into the nanofibers, which were composed of phospholipid and poly (ethylene oxide). FTIR and molecular structure modeling indicated that CA was encapsulated in HP-β-CD most probably by directly inserting the phenyl of CA into the cavity of HP-β-CD. Subsequently, the preferable mechanical properties with the uniform diameter distribution of the mat of nanofibers were realized. Meanwhile, the thermal stability of CA was further improved after being embedded into HP-β-CD and the mat of nanofibers. For the application on fresh-cut cucumber, the mat of nanofibers encapsulated with CA/HP-β-CD-IC exhibited antibacterial activity against Listeria monocytogenes at 4 °C and 25 °C for 4 days, without significant effect on the sensory indicators of fresh-cut cucumber. Thus, the mat of nanofibers encapsulated with CA/HP-β-CD-IC could be a promising and practical food packaging material.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 12
·123504
·
IF 4.316
Yuan Du,Liu Hao,Wang Zixuan,Wang Xi,Miao Guirong,Wu Xu
β-PbO2 is an important high oxygen overpotential anode coating material. Further study on nanoscale β-PbO2 with higher performance and lower cost is a critical issue in order to develop the electrochemical ozone generator. Herein, an improved β-PbO2 nanoparticles synthesizing strategy based on the traditional Pb(OAc)4 hydrolysis method is proposed in this work, which is more scalable for industrial-scale production compared with existed nano β-PbO2 synthesizing methods. The possible mechanism of synthesizing β-PbO2 nanoparticles via Pb(OAc)4 hydrolysis was discussed for the first time. Based on the proposed mechanism, the size and morphology of the β-PbO2 nanoparticles were effectively controlled, and alternative raw material that can significantly reduce costs was developed. SEM, TEM, XRD, and XPS results indicate that pure phase β-PbO2 nanoparticles range from 10–30 nm were obtained. In addition, the use of alternative raw materials reduces the cost by 90%–95% compared to the traditional Pb(OAc)4 hydrolysis method. The β-PbO2 nanoparticles showed good ozone generation performances. The energy consumption per unit ozone of the β-PbO2 nanoparticles is reduced by 51.9% at the optimized operation condition than the reference PbO2 particles used for comparison.
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LANGMUIR
·
2012
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IF 4.186
Dong Wang,Panfeng Long,Renhao Dong,Jingcheng Hao
A new ternary system of tetradecyldimethylamine oxide (C14DMAO)/4-phenylazo benzoic acid (AzoH)/H2O was first investigated, and it was found that the self-assembly can be regulated via temperature and β-cyclodextrin (β-CD) recognition. In the temperature regulated self-assembly, the self-assembled phase structural transition between wormlike micelles and multilamellar vesicles (onions) were determined by cryogenic-transmission electron microscopy (cryo-TEM) images and 2H nuclear magnetic resonance (2H NMR) spectra. The phase structural transition temperatures (PSTT) controlled by changing the amount of AzoH were measured by differential scanning calorimetry analysis. The self-assembled phase structural transition mechanism was discussed. It is argued that the self-assembled phase structural transition is the synergetic balance among the hydrophilic headgroup, steric structures of the hydrophobic chain, and membrane charge. β-CD molecules were used as controlling hands to modulate the phase structural transition of self-assembly of the C14DMAO/AzoH/H2O system in solution via snatching C14DMAO molecules. The phase structural transitions from the threadlike micellar phase to the lamellar phase and from the lamellar phase to the vesicular phase can each be controlled because of the β-CD molecular recognition. The phase structural transitions were confirmed by cryo-TEM observations and 2H NMR measurements. The rheological properties were also investigated to display the importance in the phase structural transition. It was found that the dye molecule, AzoH, is harder to enclose by β-CD than by C14DMAO because of the lower complex stability constant (i.e., KC14DMAO@β-CD ≫ KAzoH@β-CD. Therefore, the phase structural transition is mainly controlled by the inclusion of C14DMAO into the hydrophobic cavity of β-CD molecules. The phase structural transition controlled via temperature and β-CD may find potential applications such as in actuators, shape memories, drug delivery systems, and drag-reducing fluids, etc.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Yao Hu,Chao Qiu,Zhengyu Jin,Yang Qin,Chen Zhan,Xueming Xu,Jinpeng Wang
Stable Pickering emulsions were prepared by using hybrid β-cyclodextrin/short linear glucan nanoparticles (β-CD/SLG NPs). The β-CD/SLG NPs displayed spherical shape and with an average size at around 60 nm. Newly formed SLG-β-CD structure in the nanoparticles was thought the main reason for the improved thermal stability, alleviated aggregation, and improved dispersity in aqueous systems. Depending on the contact angle and zeta-potential results, unique emulsifying mechanism of β-CD/SLG NPs was existed. The formation of inclusion complex between β-CD and oil molecules accelerated the adsorption of the whole nanoparticles at the oil-water interface, while the swelling of SLG contributed to the long-term stability (6 months) of emulsions. Once the hybrid ratio of β-CD/SLG NPs reached saturation (1:1), excess β-CD led to co-emulsifying effect of both the hybrid regions and easily dissociated β-CD regions. These hybrid β-CD/SLG NPs showed superiority with great potential in applications to the food, cosmetic, and pharmaceutical industries.
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Analytical Methods
·
2015
·Vol. 7
·期 19
·8352-8359
·
IF 1.821
Zhaokun Yang,Dongjian Shi,Mingqing Chen,Shirong Liu
Inverse opals of molecularly imprinted photonic hydrogels (CD-MIPHs) based on β-cyclodextrin were first elaborated by using a colloidal crystal template method. The film can be exfoliated from the substrate in H2O to get a free-standing photonic crystal film. L-Tryptophan imprinted polyacrylamide photonic hydrogels (PAM-MIPHs) and CD-MIPHs were fabricated in this paper. The PAM-MIPHs exhibited a good sensing property to L-Trp and the redshift of the Bragg diffraction peak was 83 nm. Furthermore, improved recognition of L-Trp can be achieved by using CD-MIPHs. The Bragg diffraction peak of CD-MIPHs redshifted by 126 nm when the CD-MIPHs were immersed in a series of concentrations of L-Trp solution, and a visually perceptible color change was clear. Moreover, enantioselective recognition of Trp enantiomers was accomplished by CD-MIPHs instead of PAM-MIPHs. In short, the resultant CD-MIPHs showed a rapid response, high selectivity, high sensitivity and specificity towards imprinted molecules in an aqueous environment.
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Journal of Nanomaterials
·
2012
·
IF 1.376
Suli Wu,Yanhui Ning,Shufen Zhang
Novel chelating ligands are very significant for preparing nanocrystals with different morphologies and applications. In this paper, we directly introduced amine groups onto UCNPs by choosing a new chelating ligand tetraethylene pentamine (TEPA) to synthesis
N
a
Y
F
4
:Yb, Er through hydrothermal method. The influences of rare earth concentration, the ratio of RE/TEPA, solvent composition, and reaction time on the morphology and fluorescence intensity of the as-prepared
N
a
Y
F
4
:Yb, Er samples were systematically investigated and discussed. Field emission scanning electron microscopy (FE-SEM), powder X-ray diffraction (XRD), and upconversion luminescence spectroscopy were used to characterize the product. It was found that rare earth concentration, ratio of RE/TEPA, solvent composition, and reaction time were all responsible for the luminescent intensity and morphology.
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JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Xiangqiong He,Adeel Ahmed,Shuaibing Guo,Chuankui Kang,Youqing Shen,Hailin Cong,Bing Yu
Recently, the design and development of efficient chiral stationary phases is still the core and goal of chiral chromatography. In order to quickly separate chiral drugs, we designed and prepared an environmentally friendly small particle chiral stationary phase: p-methylphenylurea-β-cyclodextrin chiral stationary phase (SiO 2 @PMPU-β-CD). Firstly, p-methylphenylurea-β-cyclodextrin (PMPU-β-CD) was connected to the surface of mesoporous silica microspheres by diazoresin (DR) to prepare a SiO 2 @PMPU-β-CD. In reverse elution mode, the column temperature was set at 25 °C, the flow rate was 0.2 mL/min, and ACN H 2 O (v/ v = 70:30) was used as the elution condition of the mobile phase. The enantiomers of chlorpheniramine maleate, 2-phenylcyclohexanone, and promethazine were separated within 5 min. In addition, the addition of TEAA buffer to the mobile phase improved the enantiomer resolution of chlorpheniramine maleate from 1.03 to 5.69. The experimental results show that the SiO 2 @PMPU-β-CD column can be used for the separation of appellant chiral drugs with good repeatability, and the use of DR instead of silane coupling agent has the advantages of being non-toxic, environmentally protected, and easy to operate, which is of great significance for the development of chiral stationary phase.
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