Showing papers by "Henan University of Technology published in 2017"
TL;DR: In this article, the authors provide an overview on the current status of self-healing gels for use in soft selfhealing devices, with the main focus on wearable devices.
Abstract: Self-healing gels, which are able to restore their original shape/condition after damage, have recently attracted considerable interest. The present review provides an update on the current status of self-healing gels for use in soft self-healing devices, with the main focus on wearable devices. Following a brief introduction of conventional self-healing gels, this review summarizes the current strategies for synthesizing self-healing gels, comparing the properties of polymeric and small molecular self-healing gels. Some of the strengths and weaknesses of these two types of self-healing gels are clearly highlighted. Several typical instances to outline the emerging applications of self-healing gels with partially or fully self-healing devices/materials, including wearable sensors, supercapacitors, lithium batteries, and coatings, are provided. Finally, the current challenges and future perspectives regarding the further development of self-healing gels are also discussed.
149 citations
TL;DR: Investigations of the polysaccharides from the seed meal of Chinese quince provide a scientific basis for the use of the by-products of quince seed oil processing, particularly as an ingredient in functional foods and medicines.
146 citations
TL;DR: In this paper, a series of novel aggregation-induced emission luminogens (AIEgens) based on 2,5-bis(4-alkoxycarbonylphenyl)-1,4-diaryl-1, 4-dihydropyrrolo[3,2-b]pyrrole (AAPP) was developed.
Abstract: Aggregation-induced emission luminogens (AIEgens) have attracted extensive interest for their outstanding luminescence properties in the aggregated state and even in the solid state. In this work, we developed a series of novel AIEgens based on 2,5-bis(4-alkoxycarbonylphenyl)-1,4-diaryl-1,4-dihydropyrrolo[3,2-b]pyrrole (AAPP). The AIEgens can be facilely synthesized through a single-step reaction under mild conditions with satisfactory yields. Interestingly, AAPP was found to have multiple luminous mechanisms that result in variable fluorescence properties. The propeller-like structure of AAPP enables a restricted intramolecular rotation (RIR) process which significantly enhances its fluorescence in the aggregated state (i.e. AIE fluorescence). In addition, there is a donor-acceptor interaction between the heterocycle center and the alkoxycarbonyl units in AAPP which allows a typical twisted intramolecular charge transfer (TICT) process in the dispersed state, resulting in strong fluorescence emissions in non-polar or low-polarity solvents but fluorescence quenching in high-polarity solvents. Due to the tunable RIR and TICT processes and the multiple fluorescence, AAPP compounds exhibit multifunctional applications: (1) as a reversible fluorescent thermometer, AAPP exhibited excellent fatigue resistance. There was a good linear relationship between its fluorescence intensity and temperature from 10 °C to 60 °C. (2) The desethyl AAPP derivative (CAPP) was successfully applied in the detection of Cd(ii) in aqueous solution at neutral pH, and showed a 500-fold fluorescence "turn-on" response to Cd(ii) with good selectivity.
136 citations
TL;DR: Hydroxyapatite-encapsulated γ-Fe2O3 nanoparticles were prepared, and lipase from Candida rugosa was covalently bound onto the magnetic materials via covalent linkages and showed a strong magnetic responsiveness and displayed high catalytic activities towards the interesterification of soybean oil.
130 citations
TL;DR: A transition metal-free direct C-3 arylation of quinoxalin-2(1H)-ones with arylamine with a broad range of substrates and functional group tolerance has been explored.
Abstract: A transition metal-free direct C-3 arylation of quinoxalin-2(1H)-ones with arylamines has been explored. This reaction proceeded smoothly through a radical process under mild conditions and produced the desired arylation products in good yields. The reactions proceeded efficiently with a broad range of substrates and functional group tolerance.
125 citations
TL;DR: In this article, the dependence structure between economic policy uncertainty and stock market returns in G7 and BRIC was examined using quantile regression techniques, and it was shown that eight out of ten stock markets reveal asymmetric dependence with EPU, with the exception of France and the UK.
104 citations
TL;DR: In this article, the effects of calcium treatment combined with cold storage on the physical properties, polysaccharide content and nanostructure of apricots were investigated, and the results suggest that texture of Apricots can be effectively maintained by 1% calcium chloride treatment and storage at 5°C or 10°C.
95 citations
TL;DR: In this article, the modification and application of dietary fiber in foods is reviewed with respect to definition and classification and methods for measurement, extraction, and modification of dietary fibre, which plays an important role in human health.
Abstract: Dietary fiber plays an important role in human health. The modification and application of dietary fiber in foods is reviewed with respect to definition and classification and methods for measurement, extraction, and modification of dietary fiber. The supplementation of dietary fiber for flour, meat, and dairy products is also reviewed. Finally, the benefits and risks of increasing consumption of dietary fiber are discussed.
94 citations
TL;DR: The sodium storage performance of Sb2Se3/C is observably enhanced, benefiting from the 1D structure and the introduction of a carbon layer with robust structure stability and conductivity.
Abstract: One-dimensional Sb2Se3/C rods are prepared through self-assembly by inducing anisotropy, and their corresponding sodium storage behaviors are evaluated, presenting excellent electrochemical performances with superior cycling stability and rate capability. Sb2Se3 delivers a high initial charge capacity of 657.6 mA h g–1 at a current density of 0.2 A g–1 between 2.5 and 0.01 V. After 100 cycles, the reversible capacity of Sb2Se3/C is still retained at 485.2 mA h g–1. Even at a high rate current density of 2.0 A g–1, the charge capacity is still retained at 311.5 mA h g–1. Through the analysis of cyclic voltammetry and in situ electrochemical impedance spectroscopy, the in-depth understanding of high rate performances is explored effectively. Briefly, the sodium storage performance of Sb2Se3/C is observably enhanced, benefiting from the 1D structure and the introduction of a carbon layer with robust structure stability and conductivity.
91 citations
TL;DR: In this article, a reversible photochromic molecule (1) with aggregation-induced emission (AIE) properties was developed, which exhibits typical AIE properties as a result of restricted intramolecular rotation (RIR) and excited-state intramerolecular proton transfer (ESIPT) processes.
Abstract: Luminescent molecules with photochromic properties show strong potential in molecular switches, molecular logic gates, photo-controllable materials, bio-imaging, anti-counterfeiting, photo-patterning, etc. However, research is still scarce in such molecules exhibiting reversible photo-controllable color and fluorescence changes in solid states, which is due to the aggregation-caused quenching (ACQ) effect of most luminogens. In this work, a reversible photochromic molecule (1) with aggregation-induced emission (AIE) properties was developed. Compound 1 exhibits typical AIE properties as a result of restricted intramolecular rotation (RIR) and excited-state intramolecular proton transfer (ESIPT) processes. As a photochromic molecule, compound 1 shows reversible color and fluorescence changes upon UV light irradiation with good fatigue resistance. More importantly, the conversion rate from its irradiated form to its initial form is controllable by temperature and long wavelength light irradiation, which makes it suitable for photo-patterning materials with erasable properties.
89 citations
TL;DR: The results revealed that the thermostability of lysozyme, a model protein used in this study was dramatically increased in TCCL3-DES75, as evidenced by the disappearance of the denaturing peak from their Differential Scanning Calorimetry (DSC) traces.
TL;DR: In this article, an ultrasensitive sandwich-type electrochemical biosensor for microRNA (miRNA) detection is developed based on magnesium oxide (MgO) nanoflower and graphene oxide-gold nanoparticles (GO-AuNPs) hybrids coupling with electrochemicalchemical-chemical detection system.
Abstract: An ultrasensitive sandwich-type electrochemical biosensor for microRNA (miRNA) detection is developed based on magnesium oxide (MgO) nanoflower and graphene oxide–gold nanoparticles (GO–AuNPs) hybrids coupling with electrochemical–chemical–chemical (ECC) detection system. In this bioassay system, MgO nanoflowers and AuNPs are modified on electrode to act as sensing platform. The thiolated capture probe is then self-assembled onto AuNPs/MgO substrate via formation of Au-S bonds. Subsequently, a biotinylated DNA signal probe is conjugated to GO–AuNPs hybrids. When miRNA-21 is added, a sandwich complex is formed and a lot of signal indicators streptavidin-conjugated alkaline phosphatases (SA-ALP) are immobilized upon electrode by the specific reaction between avidin and biotin. Finally, ECC reaction is performed in the system to improve detection signal. The proposed sandwich-type assay benefits from advantages of sandwich-type structure for enhanced sensitivity and specificity, MgO nanoflowers/AuNPs as sensing platform and GO–AuNPs hybrids as signal carriers for signal amplification, and ECC as a sensitive detection system for low detection limit. This biosensor exhibits a good dynamic ranging from 0.1 to 100 fM and a low detection limit of 50 aM (S/N = 3) toward target miRNA-21.
TL;DR: In this article, the effects of chitosan-based coatings on the post-harvest performance Chinese cherry during a twenty-day storage period were investigated, and the most effective treatment was a combined chitosa and nano-SiOx coating, which led to 51% less weight loss, 32% less decay rate, 57% more firmness, and less SSC and TA content changes than the control group.
TL;DR: In this paper, the authors designed and synthesized CoS2 and MoS2/CoS2 nanotube arrays by one-step hydrothermal method using Co(OH)2 nanorod arrays as the template.
Abstract: We have designed and synthesized CoS2 and MoS2/CoS2 nanotube arrays by one-step hydrothermal method using Co(OH)2 nanorod arrays as the template. The products were characterized by X-ray diffraction pattern, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, and transmission electron microscopy. The MoS2/CoS2 electrode is demonstrated to have a relatively high area capacitance of 142.5 mF cm–2 at 1 mA cm–2, which is higher than that of CoS2 or MoS2 electrode. Besides, the electrode also shows excellent cycle stability of 1000 cycles with 92.7% retention, which is also superior to that of CoS2 and MoS2 electrodes. These results indicate that MoS2/CoS2 nanotube arrays have potential as electrode materials of supercapacitors because of the synergistic reaction of MoS2 (which supplies the specific surface area and effective electrolyte accessibility) and CoS2 (which serves as a conductive channel and reduces the phenomenon of aggregation). The design of MoS2/CoS2 architecture may o...
TL;DR: The effects of the degree of milling on amino acid composition, thiamine, riboflavin, phytic acid (PA), and mineral (Mg, Fe, Zn, Mn, Cu, Ca, Se, and Pb) contents of japonica Xinfeng 2 and indica T-You 15 brown rice were investigated.
Abstract: The effects of the degree of milling (DOM) on amino acid composition, thiamine, riboflavin, phytic acid (PA), and mineral (Mg, Fe, Zn, Mn, Cu, Ca, Se, and Pb) contents of japonica Xinfeng 2 and indica T-You 15 brown rice were investigated. Almost all amino acids slightly decreased as DOM increased. Quadratic and linear relationships were observed between DOM and milling time at 0–30 s and 30–100 s, respectively. Thiamine and riboflavin content decreased linearly as DOM increased. Approximately 57.6–65.4% of thiamine and 40.3–45.7% of riboflavin were removed after 30 s of milling (DOM = ca. 9%). Considerable losses were observed for PA, Mg, Mn, Fe, and Pb during milling (DOM = ca. 9%), whereas the losses of Ca, Cu, Zn, and Se were relatively lower. In addition, the linear correlations of Mg, Mn, Pb, and Fe levels with PA concentration were revealed. These results indicate that DOM should be supervised to improve nutrient utilization and appropriately control toxic metal contamination.
TL;DR: The results suggested that LJP could be considered as an ingredient of functional foods for diabetes, and this is the first report about the hypoglycemic and hypolipidemic effects of the polysaccharides extracted from Lonicera japonica.
TL;DR: This novel, simple, visual and label-free method for telomerase detection by using enzymatic etching of gold nanorods (GNRs) was considerably suitable for point-of-care diagnostics in resource-constrained regions because of the easy readout of results without the use of sophisticated apparatus.
Abstract: Early diagnosis and life-long surveillance are clinically important to improve the long-term survival of cancer patients. Telomerase activity is a valuable biomarker for cancer diagnosis, but its measurement often used complex label procedures. Herein, we designed a novel, simple, visual and label-free method for telomerase detection by using enzymatic etching of gold nanorods (GNRs). First, repeating (TTAGGG)x sequences were extented on telomerase substrate (TS) primer. It formed G-quadruplex under the help of Hemin and K+. Second, the obtained horseradish peroxidase mimicking hemin/G-quadruplex catalyzed the H2O2-mediated etching of GNRs to the short GNRs, even to gold nanoparticles (GNPs), generating a series of distinct color changes due to their plasmon-related optical response. Thus, this enzymatic reaction can be easily coupled to telomerase activity, allowing for the detection of telomerase activity based on vivid colors. This can be differentiated sensitively by naked eyes because human eyes are ...
TL;DR: This work provided a simple strategy for graphene composite fabrication, but also unveiled the underlying mechanism for its stimulation on BES, which promises new opportunity of graphene composite application in various biosystems.
TL;DR: This work would provide a novel option to treat low-strength CWW, discern the relationship between bacterial community and CWW quality, and further explore the cometabolic degradation through bacterial community structures.
TL;DR: Overall, these results demonstrated that SHH and SPI could generate novel emulsions with improved physical and chemical stability by Mallsird reaction for application in food and pharmaceutical products.
TL;DR: A simple colorimetric strategy for label-free quantification of human telomerase activity in urine by using hemin-graphene nanomaterial (H-GNs), which has the linear range from 100 to 2300 HeLa cells/ mL and the detection limit was 60 cells/mL and has been successfully applied to detect telomerases activity in real urine samples.
TL;DR: Wang et al. as mentioned in this paper pointed out that becoming a net importer of crude oil has encouraged China to develop new energy systems for heat and power generation, and increasing crude oil prices have increased the potential wide influence on Chi...
Abstract: Becoming a net importer of crude oil has encouraged China to develop new energy systems for heat and power generation. Increasing crude oil prices have increased the potential wide influence on Chi...
TL;DR: The results indicated that Sulfuricella, S sulfuritalea Thiobacillus, and S sulfurimonas are effectiveDB (denitrification bacteria)/PRB (perchlorate reduction bacteria) are effective DB/PRB bacteria.
TL;DR: In this article, a new parameterized discontinuous stabilizer is designed to ensure the FFTS of switched discontinuous systems in the sense of Filippov solutions, and a detailed analysis is provided on how to regulate the power parameters to determine the settling time is finite or fixed.
Abstract: This paper investigates the finite-time and fixed-time stabilization (FFTS) of switched systems with discontinuous dynamics, external disturbances and delays. Firstly, a new parameterized discontinuous stabilizer is designed to ensure the FFTS of switched discontinuous systems in the sense of Filippov solutions. Secondly, a detailed analysis is provided on how to regulate the power parameters to determine the settling time is finite or fixed. Thirdly, a new adaptive controller is further designed to stabilize the considered system in a finite time, and the corresponding settling time is estimated as well. Finally, two examples are given to demonstrate the efficiency of the proposed method.
TL;DR: In this article, the main purpose of the present research is to develop an environmentally more attractive process for the production of biodiesel by using a magnetic separable solid catalyst, and the magnetic carrier and biguanide-functionalized HAp-γ-Fe 2 O 3 nanoparticles were fully characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR) spectra, energy dispersive Xray (EDX) analysis, transmission electron microscopy (TEM), vibrating-sample magnetometer (VSM), and nitrogen adsor
TL;DR: Two types of distributed observer algorithms are proposed to solve the consensus problem by utilizing continuous and intermittent position measurements, respectively, where each observer does not interact with any other observers.
Abstract: This paper considers the position-based consensus in a network of agents with double-integrator dynamics and directed topology. Two types of distributed observer algorithms are proposed to solve the consensus problem by utilizing continuous and intermittent position measurements, respectively, where each observer does not interact with any other observers. For the case of continuous communication between network agents, some convergence conditions are derived for reaching consensus in the network with a single constant delay or multiple time-varying delays on the basis of the eigenvalue analysis and the descriptor method. When the network agents can only obtain intermittent position data from local neighbors at discrete time instants, the consensus in the network without time delay or with nonuniform delays is investigated by using the Wirtinger’s inequality and the delayed-input approach. Numerical examples are given to illustrate the theoretical analysis.
TL;DR: In this review, the advances in the area of organocatalytic asymmetric vinylogous Michael reactions on the period from 2014 to nowadays are discussed, including the current scope, limitations of the transformations and applications in asymmetric synthesis of complex and valuable compounds.
Abstract: Since R. C. Fuson formulated the principle of vinylogy, this platform has been extensively developed through combining diverse predominant chemical transformations. Among them, asymmetric vinylogous Michael reaction has been recognized as an efficient method to build chiral 1,7-dioxo C chains (1,9-dioxo C chains for bisvinylogous manifold) with diverse functional groups, which provides robust approaches to access numerous chiral compounds with pharmaceutical importance. In this review, the advances in the area of organocatalytic asymmetric vinylogous Michael reactions on the period from 2014 to nowadays are discussed, including the current scope, limitations of the transformations and applications in asymmetric synthesis of complex and valuable compounds.
TL;DR: In this article, 3D hollow porous carbon microspheres (3DHPCMs) are firstly prepared by the carbonization and post acid-treatment of 3DMn-MOFs, showing a high surface area of 788.2 m2 g−1 and a diameter of about 2 μm.
Abstract: Extensive efforts have been put into developing new materials with a 3D hollow porous spherical structure for increasing their applications in energy storage. In this work, 3D hollow porous carbon microspheres (3DHPCMs) are firstly prepared by the carbonization and post acid-treatment of 3D hollow microspherical Mn-MOFs (3DMn-MOFs), showing a high surface area of 788.2 m2 g−1 and a diameter of about 2 μm. Importantly, this is the first time that the conversion from 1D nanorods to 3D hollow spheres of Mn-MOFs through regulating the amount of poly(vinylpyrrolidone) (PVP) has been realized. Besides, the sodium storage behavior of 3D hollow porous carbon microspheres is also firstly studied. When utilized as anodes for sodium ion batteries (SIBs), the 3DHPCMs deliver excellent electrochemical storage performances with a high specific capacity of 313.8 mA h g−1 at a current density of 100 mA g−1. Impressively, a high discharge specific capacity of 112.5 mA h g−1 is obtained at 5 A g−1. The outstanding electrochemical performances can be attributed to the 3D hollow porous microsphere structure, which can enhance the mechanical stability, buffer the volume expansion, and accelerate the transport of Na+ and electrons. This work provides a new route for the development of materials with a 3D hollow spherical structure.
TL;DR: In this article, a small-scale horizontal axis hydrokinetic turbine is designed, manufactured and studied both experimentally and numerically in this study, which is expected to work in most of China's sea areas where the ocean current velocity is low and to supply electricity for remote islands.
13 Jan 2017-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the boundary strengthen mechanism based Hall-Petch relationship was used to explain the mechanism and to predict the influence of the ultrasonic residual effect for aluminium and titanium.
Abstract: The mechanism of ultrasonic softening effect has been widely investigated and used in the metal material processing area. Deficiency discussion, however, has been focused on the residual effect of ultrasonic vibration on the plasticity of metals only. In this study, ultrasonic vibration assisted compression (UAC) experiments were carried out using commercially pure aluminium and titanium samples. Despite the similar ultrasonic softening effect, different ultrasonic residual effects were observed in the aluminium and titanium samples. Aluminium exhibited a residual hardening phenomenon, whereas in titanium the initial residual hardening effect transferred to a residual softening effect with an increase in amplitude of the applied ultrasonic vibration. Electron backscatter diffraction (EBSD) characterizations revealed that substructure multiplication, texture evolution and dynamic recrystallization caused by the ultrasonic vibration are the main causes of the residual hardening effect of aluminium. The boundary strengthen mechanism based Hall–Petch relationship was used to explain the mechanism and to predict the influence of the ultrasonic residual effect for aluminium. For the titanium, it was found that the ultrasonic vibration reduced the density of deformation twinning in the specimen, and the evolution of residual effect was analysed from the aspects of grain refinement, deformation twinning induced strain hardening. By quantitative study, the main reason for the residual hardening effect of UAC aluminium sample is identified to be the ultrasonic vibration induced grain refinement, while for the titanium, the weakened strain hardening effect induced by deformation twinning should be the main factor accounting for the residual softening of titanium. Also the ultrasonic vibration could have a similar influence as that of the thermal treatment to the titanium sample, resulting in the yield point elongation (YPE) phenomenon.