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81.
Molecularly imprinted polymer (MIP) for selective extraction of p-hydroxybenzoic acid (p-HB) was synthesized by suspension polymerization using p-HB as template, 4-vinyl pyridine as functional monomer and ethylene glycol dimethacrylate as crosslinker. As characterized by scanning electron microscopy, the MIP particles are spherical, with size ranging from 1 to 8 μm. Compared with the non-imprinted polymer (NIP), the MIP shows higher binding capacity toward p-HB: maximum binding capacity for p-HB being 8.07 μmol g−1 over MIP and 3.88 μmol g−1 over NIP. The adsorption of p-HB on MIP follows the Freundlich model and displays pseudo-second-order kinetics. The results of selective and competitive binding experiments confirm that the molecularly imprinted sites have excellent recognition ability toward p-HB. The results reveal that the MIP is a promising adsorbent for selective extraction of p-HB from water samples. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 46984. 相似文献
82.
Jin-Bo Pan Sheng Shen Lang Chen Chak-Tong Au Shuang-Feng Yin 《Advanced functional materials》2021,31(36):2104269
Photoelectrochemical (PEC) water splitting into hydrogen and oxygen is a promising solution for the conversion and storage of solar energy. Because sluggish water oxidation is the bottleneck of water splitting, the design and preparation of an efficient photoanode is intensively investigated. Currently, all known photoanode materials suffer from at least one of the following drawbacks: ① low carriers separation efficiency; ② sluggish surface water oxidation reaction; ③ poor long-term stability; ④ insufficient water adsorption and gas desorption. Core–shell configurations can endow a photoanode with improved activity and stability by coating an overlayer that plays energetic, catalytic, and/or protective roles. The construction strategy has an important effect on the activity of a core–shell photoanode. Nonetheless, the mechanism for the improvement of performance is still ambiguous and is worthy of a closer examination. In this review, the successes and challenges of core–shell photoanodes for water oxidation, focusing on synthesis strategies as well as functionalities (facilitating carrier separation, surface reaction promotion, corrosion prevention, and bubble detachment) are explored. Finally, the perspectives of this class of materials in terms of new opportunities and efforts are discussed. 相似文献
83.
84.
Hua Yang Shi-Xiao Wei Han Chen Lang Chen Chak-Tong Au Ting-Liang Xie Shuang-Feng Yin 《American Institute of Chemical Engineers》2022,68(10):e17810
A high-throughput (105.5 g/h) passive four-stage asymmetric oscillating feedback microreactor using chaotic mixing mechanism was developed to prepare aggregated Barium sulfate (BaSO4) particles of high primary nanoparticle size uniformity. Three-dimensional unsteady simulations showed that chaotic mixing could be induced by three unique secondary flows (i.e., vortex, recirculation, and oscillation), and the fluid oscillation mechanism was examined in detail. Simulations and Villermaux–Dushman experiments indicate that almost complete mixing down to molecular level can be achieved and the prepared BaSO4 nanoparticles were with narrow primary particle size distribution (PSD) having geometric standard deviation, σg, less than 1.43 when the total volumetric flow rate Qtotal was larger than 10 ml/min. By selecting Qtotal and reactant concentrations, average primary particle size can be controlled from 23 to 109 nm as determined by microscopy. An average size of 26 nm with narrow primary PSD (σg = 1.22) could be achieved at Qtotal of 160 ml/min. 相似文献
85.
In this paper, the construction, evaluation, and application of cDNA libraries from eight unfertilized oocytes and single four-cell-, seven-cell-, and blastocyst-stage embryos are described. Rapid, reproducible, and efficient procedures for the construction of PCR-based cDNA libraries from fewer than 10 cells were first developed in small populations of fibroblast cells. The human embryo libraries display complexities sufficient (between 10(5) and 10(6) clones) to represent the entire active gene population at these early stages of human development. The ubiquitous cytoskeletal elements, beta-actin, keratin-18, and alpha-tubulin, were detected at the expected frequency. Sequencing of consecutively picked random clones, without selection, showed the presence of a variety of sequences, such as the human transposable element, LINE-1 and Alu repeat sequences, housekeeping genes, and tissue-specific genes, such as alpha-globin and FMR-1. In addition to cDNAs corresponding to known ESTs (expressed sequence tags) in the GenBank and dbEST databases, a high proportion of novel sequences were detected. Applications of the libraries to several areas of interest, such as expression of CpG-island-containing "tissue-specific" genes, developmental genes expressed in a stage-specific manner, and a search for monoallelic expression of imprinted genes, are described. The libraries are a valuable resource for the study of gene expression during human preimplantation development and obviate the need for research on the human embryos themselves. 相似文献
86.
Zhen Xu Fei Xie Jing Wang Heather Au Mike Tebyetekerwa Zhenyu Guo Shengyuan Yang Yong‐Sheng Hu Maria‐Magdalena Titirici 《Advanced functional materials》2019,29(39)
Na‐ion hybrid capacitors consisting of battery‐type anodes and capacitor‐style cathodes are attracting increasing attention on account of the abundance of sodium‐based resources as well as the potential to bridge the gap between batteries (high energy) and supercapacitors (high power). Herein, hierarchically structured carbon materials inspired by multiscale building units of cellulose from nature are assembled with cellulose‐based gel electrolytes into Na‐ion capacitors. Nonporous hard carbon anodes are obtained through the direct thermal pyrolysis of cellulose nanocrystals. Nitrogen‐doped carbon cathodes with a coral‐like hierarchically porous architecture are prepared via hydrothermal carbonization and activation of cellulose microfibrils. The reversible charge capacity of the anode is 256.9 mAh g?1 when operating at 0.1 A g?1 from 0 to 1.5 V versus Na+/Na, and the discharge capacitance of cathodes tested within 1.5 to 4.2 V versus Na+/Na is 212.4 F g?1 at 0.1 A g?1. Utilizing Na+ and ClO4? as charge carriers, the energy density of the full Na‐ion capacitor with two asymmetric carbon electrodes can reach 181 Wh kg?1 at 250 W kg?1, which is one of the highest energy devices reported until now. Combined with macrocellulose‐based gel electrolytes, all‐cellulose‐based quasi‐solid‐state devices are demonstrated possessing additional advantages in terms of overall sustainability. 相似文献
87.
In the non-oxidative aromatization reaction (temperature = 770 C, flow rate = 34 ml min-1), 2 wt% Mo/HZSM-5 deactivated after 4 h due to severe coking. We observed that with a suitable amount of O2 (5.3 vol%) in the methane feed, the catalyst could last for more than 6 h with a ca. 4% yield of aromatics at 770 °C. Depending on the concentration of O2 or the reaction temperature, there are three reaction zones in the catalyst bed: (i) methane oxidation; (ii) methane reforming; and (iii) methane aromatization. CO and H2 produced in the first two zones are accountable for stability amelioration of the catalyst. The addition of NO exhibited similar effects on the reaction. Further increase in O2 (8.4 vol%) or NO (14.2 vol%) concentration would result in CO and CO2 being the predominant carbon-containing products; C2H4 and C2H6 were generated in small amounts and no aromatics were detected. 相似文献
88.
D. Zhou S. H. Lo F. T. K. Au Y. K. Cheung 《International Journal of Mechanical Sciences》2002,44(12):2503-2522
In this paper, the vibration characteristics of rectangular Mindlin plates with internal line supports in one or two directions are studied by using the Rayleigh–Ritz method. The static Timoshenko beam functions are employed as admissible functions, which are composed of a set of transverse deflection functions and a set of rotation-angle functions due to bending. The static Timoshenko beam functions are derived from a point-supported strip of unit width taken from the particular plate under consideration in a direction parallel to the edge of the plate and acted upon by a series of static sinusoidal loads distributed along the length of the strip. It can be seen that the suggested approach is very simple mathematically, and each of the beam functions is only a sine or cosine function plus a polynomial function of not more than the third order. A unified program can be easily prepared, because the changes in boundary conditions, number and locations of internal line supports and thickness ratio of the plate will result in a corresponding change of only the coefficients of the polynomials. Both high accuracy and low computational cost have been verified by convergence and comparison studies. In addition, it can be seen that the admissible functions presented in this paper can also properly describe the discontinuity conditions of the shear forces at the line supports. Therefore, accurate results can be expected for the analysis of dynamic response and internal force distribution of the plate. 相似文献
89.
K.F. Au W.K. Wong X.H. Zeng 《The International Journal of Advanced Manufacturing Technology》2006,29(3-4):408-417
Clothing manufacturers’ direct investment and joint ventures in developing regions have grown rapidly in the last few decades.
An inappropriate decision on site selection can cause adverse affects on productivity and increase manufacturing and logistical
costs. Manufacturers often face with difficulties during the decision-making process, due to vague and subjective considerations.
The process is hampered with variables that cannot be represented in terms of objective values, such as country risk and community
facilities. The decision on plant location thus relies mostly on the subjective intuition and assessment of the manufacturer.
This paper explains the development of a decision-making model for a clothing plant location, using the feed-forward neural
network with an error back-propagation (EBP) learning algorithm and a fuzzy analytical hierarchy process (FAHP). Significant
variables in the selection of a clothing plant location will be identified and input into the proposed decision-making model.
A suitability index was computed for each site. The sites with higher suitability indices were more appropriate for the establishment
of a clothing plant. It was also identified that those variables considered on plant location with lower evaluation weights
can be neglected without affecting the prediction accuracy of the proposed decision model . 相似文献
90.