JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2017
·
IF 2.764
Baihao You,Qingtao Li,Hua Dong,Tao Huang,Xiaodong Cao,Hua Liao
The fabrication of osteochondral tissue engineering scaffolds comprised of different layers is a big challenge. Herein, bilayers comprised of double network hydrogels with or without nano hydroxyapatite (HAp) were developed by exploiting the radical reaction of poly(ethylene glycol) diacrylate (PEGDA) and the Schiff-base reaction of N-carboxyethyl chitosan (CEC) and oxidized hyaluronic acid sodium (OHA) for osteochondral tissue engineering. The bilayered osteochondral scaffold was successfully fabricated based on the superior self-healing property of both hydrogels and evaluated by scanning electron microscopy, macroscopic observation and mechanical measurements. In addition, the hydrogels exhibited good biocompatibility as demonstrated by the in vitro cytotoxicity and in vivo implantation tests. The results indicated that the bilayered hydrogel had great potential for application in osteochondral tissue engineering.
研究领域:
材料科学
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生物医学工程
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组织工程
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生物材料
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 21
·6716
·
IF 3.623
Shiyu Ma,Yan Lu,Bo Wang,Jinkai Li
White LEDs were encapsulated using Cs4PbBr6quantum dots and Gd2O3:Eu red phosphor as lamp powder. Under the excitation of a GaN chip, the color coordinates of the W-LED were (0.33, 0.34), and the color temperature was 5752 K, which is close to the color coordinate and color temperature range of standard sunlight. The electric current stability was excellent with an increase in the electric current, voltage, and luminescence intensity of the quantum dots and phosphors by more than 10 times. However, the stability of the quantum dots was slightly insufficient over long working periods. The photocatalytic devices were constructed using TiO2, CsPbBr3, and NiO as an electron transport layer, light absorption layer, and catalyst, respectively. The Cs–Pb–Br-based perovskite quantum dot photocatalytic devices were constructed using a two-step spin coating method, one-step spin coating method, and full PLD technology. In order to improve the water stability of the device, a hydrophobic carbon paste and carbon film were selected as the hole transport layer. The TiO2layer and perovskite layer with different thicknesses and film forming qualities were obtained by changing the spin coating speed. The influence of the spin coating speed on the device’s performance was explored through SEM and a J–V curve to find the best spin coating process. The device constructed by the two-step spin coating method had a higher current density but no obvious increase in the current density under light, while the other two methods could obtain a more obvious light response, but the current density was very low.
研究领域:
材料科学
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光电
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光催化
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DOI
高影响因子
PeerJ Computer Science
·
2024
·
IF 3.5
Kashif Ishaq,Atif Alvi,Muhammad Ikram ul Haq,Fadhilah Rosdi,Abubakar Nazeer Choudhry,Arslan Anjum,Fawad Ali Khan
Programming courses in computer science play a crucial role as they often serve as students’ initial exposure to computer programming. Many university students find introductory courses overwhelming due to the vast amount of information they need to grasp. The traditional teacher-lecturer model used in university lecture halls frequently leads to low motivation and student participation. Personalized gamification, a pedagogical approach that blends gamification and personalized learning, offers a solution to this challenge. This approach integrates gaming elements and personalized learning strategies to motivate and engage students while addressing their individual learning needs and differences. A comprehensive literature review analyzes 101 studies based on research design, intervention, outcome measures, and quality assessment. The findings suggest that personalized gamification can enhance student cognition in programming courses by boosting motivation, engagement, and learning outcomes. However, the effectiveness of personalized gamification depends on various factors, including the types of gaming elements used, the level of personalization, and learner characteristics. This article offers insights into designing and implementing effective personalized gamification interventions in programming courses. The findings may inform educators and researchers in programming education about the potential benefits of personalized gamification and its implications for educational practice.
研究领域:
计算机科学教育
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教育技术
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教学设计
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学习科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Wei Wan,Xinxin Han,Yayun Zhou,Fangrui Chen,Xiping Jing,Shi Ye
Developing a secure and unclonable anti-counterfeiting technology with more dimensional encryptions is urgently demanded. All-inorganic halide perovskites hold great potential for applications in advanced fluorescence anti-counterfeiting owing to their superior optical properties, such as tunable emission colors, narrow emission peaks, etc. By further utilizing the feasibility of anion exchange for perovskite halides, this research successfully designs five-dimensional (5D) anti-counterfeiting barcodes with core–shell-like structured perovskite-like oxide and perovskite halide composites. The composites are prepared by a facile synthesis method, which includes adhesive growth of Cs(Pb x Mn 1-x )(Cl y Br 1-y ) 3 on the surface of CsCa 2 Ta 3 O 10 : Yb, Er (abbreviated as CCTO: Yb, Er@CsMX 3 ) via sharing Cs + at the interface. The unique structure makes it possess sensitivity to some additive decrypted inks, offering one more intriguing anti-counterfeiting dimension beyond the common dual-mode fluorescence and time-gating technique. The CCTO: Yb, Er@CsMX 3 composites exhibit typical green upconversion (UC) luminescence under a 980 nm laser, red or green or blue (RGB) emission under ultraviolet (UV) light irradiation, ns-ms emission decay time, and changeable emission color when treated with decrypted inks. The fluorescent inks and barcodes are simple for fabrication, efficient for coding, easy for viewing and difficult for cloning, making them promising for anti-counterfeiting applications.
研究领域:
材料科学
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光学
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纳米技术
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防伪技术
✓ 已验证
DOI
高影响因子
ANALYTICAL BIOCHEMISTRY
·
2023
·
IF 2.9
Yan Xiong,Shu Zhu,Hua Zhao,Jin Li,Yanting Li,Tao Gong,Yanru Tao,Jiangling Hu,Hongmei Wang,Xinhui Jiang
For patients receiving organ transplants, monitoring the blood concentration of MPA can provide timely information on whether MPA has reached the effective therapeutic window to better function while reducing the incidence of rejection or adverse reactions. In this study, an electrochemical sensor for the detection of MPA was built using a nanocomposite made of CS-MWCNT and AuNPs. At the same time, the high performance liquid phase (HPLC) method for MPA was established and compared with this sensor. The surface morphology, structure, and roughness of the material on the electrode were characterized by scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FTIR), and atomic force microscopy (AFM). In addition, the electrochemical behavior of the modified electrode was characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The standard curve was obtained in blank plasma, not pure buffer solution. The peak current was linearly related to the MPA concentration in the linear range of 0.001–0.1 mM with a detection limit of 0.05 μM and good anti-interference ability. Moreover, the sensor was employed with success for the determination of MPA in rat plasma with good recovery. The electrochemical sensor presented here is eco-friendly, and sensitive, and offers a great possibility for practical applicability.
研究领域:
电化学
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纳米技术
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分析化学
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生物医学工程
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药物分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Xiaofang Ma,Jing Chen,Yali Wu,Samrat Devaramani,Xiaoyan Hu,Qixia Niu,Caizhong Zhang,Duoliang Shan,Huan Wang,Xiaoquan Lu
The RGO/AuNPs/CS/ZnTCPP nanocomposites were successfully prepared with reduced graphene oxide (RGO) loaded with Au nanoparticles (AuNPs) existed in chitosan (CS) and water-soluble zinc meso-tetra (4-carboxylphenyl) porphyrin (ZnTCPP) by π-π nanoassembly method and were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), 1 H NMR spectra and UV–vis absorption spectroscopy. The most important advantage of the RGO/AuNPs/CS/ZnTCPP nanocomposites was environmentally friendly. Indium tin oxide (ITO) electrode surface was modified with the RGO/AuNPs/CS/ZnTCPP nanocomposites exhibited a good photocurrent response at −0.2 V under whitelight of Xenon lamp illumination. The photocurrent response could be greatly increased by adding hydroquinone (HQ) to the solution. Electrons of ZnTCPP were excited from HOMO to LUMO by irradiating light. The photoexcited electrons injected into the RGO , and then transferred to AuNPs further to the ITO. Addition of HQ resulted in the enhanced photocurrent signal by acting as a sacrificial electron donor ; Thereby scavenged the photogenerated holes of the excited ZnTCPP and oxidized to benzoquinone (BQ). Based on the above interaction, detection of HQ was developed by a novel photoelectrochemical (PEC) sensor (S/N = 3) with a linear range from 5 to 300 nmol/L (r = 0.997) and detection limit of 0.5 nmol/L. Proposed biosensor is simple, rapid and this was successfully applied for the quantification HQ in the real sample matrices.
研究领域:
纳米技术
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光电化学
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环境科学
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分析化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN NUCLEAR ENERGY
·
2023
·
IF 2.7
Wei Zhang,Hongwei Zhu,Zelin Gao,Gang Xu,Xiaotong Chen,Bing Liu,Yaping Tang
As one of potential treatments for irradiated graphite (i-graphite) waste, the oxidation method has been attracting more concern due to features of high treating efficiency and significant volume reduction. The release of fission products during oxidation is of great significance for further off-gas decontamination procedures. Focusing on the release behavior of volatile cesium (Cs), Cs-loaded graphite was prepared by impregnation in this work followed by definite distribution and chemical speciation analyzing. Results showed that the increasing temperature and humidity during the oxidation were evidenced to promote the release of Cs compounds, and the chemical speciation of released compounds was prominently dependent on oxidizing temperature. When the oxidation temperature was around 700 °C, Cs 2 O was predominately released with the morphology of spherical particles. When the oxidation temperature was increased to 900 °C, the predominant releasing composition turned to Cs 2 CO 3 with morphologies of both spherical particles and nanorod-like shapes. The different predominant releasing chemical compositions at different temperatures mainly resulted from the kinetics of graphite oxidization and temperature synergistically. These findings will provide theoretical foundations to the environmental evaluation of i-graphite thermal oxidation .
研究领域:
核科学与工程
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Jiangmin Song,Guanxing Huang,Dongya Han,Qinxuan Hou,Ruinan Liu
High performance and high permeability of reactive materials are crucial issues for the remedy of arsenic (As)-enriched groundwater by permeable reactive barriers. The remediation strategy integrating adsorption and oxidation has gained wide concerns due to its deep removal for As(Ⅲ). In this study, a granular bifunctional nanocomposite MgO-Chitosan-MnO 2 (MgO-CS-MnO 2 ) was fabricated as permeable reactive media for the in-situ remediation for high As groundwater. The needle structure of MnO 2 could provide adequate oxidation sites, furthermore, the multilayer porous characteristic of MgO-CS could also meet higher adsorption capacity. As a result, the estimated maximal adsorption capacity of MgO-CS-MnO 2 for As(Ⅲ) reached to 266.61 mg/g and 578.05 mg/g for arsenate (As(Ⅴ)), which are much higher than current similar adsorbents. The adsorption behaviors of As(Ⅲ/Ⅴ) follow pseudo-second-order kinetic model and Freundlich isotherm model, suggesting that both As(Ⅲ) and As(Ⅴ) are mainly chemisorbed onto MgO-CS-MnO 2 . It could perform effectively in a broad range of pH values (3−11), moreover, competing oxyanions (CO 3 2- , NO - , and SO 4 2- ), organic matters (humic acid) and ion strength exert no significant influence towards As remediation. XPS results revealed As(Ⅲ) adsorbed onto composite completely transformed to As(Ⅴ), and removal mechanisms involved oxidation and metal-O-As(Ⅲ/Ⅴ) complexation. In addition, it can be easily regenerated and recycled maintaining an excellent adsorption and oxidative ability. Besides, Column experiment demonstrated this composite column could effectively treat 1300 and 1700 bed volume (BV) of synthetic As(Ⅲ/Ⅴ)-contaminated groundwater, respectively. Therefore, MgO-CS-MnO 2 have a great potential applicability towards high As groundwater improvement as permeable reactive media.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Bin Zuo,Qinyue Deng,Han Shao,Bingbing Cao,Yunhui Fan,Wanfang Li,Mingxian Huang
In this work, we designed the Fe3O4@mesoporous-SiO2@chitosan@polyaniline core–shell nanoparticles (Fe3O4@mSiO2@CS@PANI, hence abbr. FSCP), which can be used to capture Cr(VI) in wastewater. Rapid adsorption behavior and high removal capability (249.6 mg Cr(VI) per gram of FSCP) were exhibited by this material. X-ray photoelectron spectroscopy (XPS) analysis demonstrates that Cr(VI) was adsorbed and in situ reduced on FSCP at pH 2. Adsorption was facilitated by the electrostatic attraction of HCrO4– and −N+═C–/–N+H–, while the active −NH–/–N+H– sparked the reduction of Cr(VI) to Cr(III). Moreover, the coordination of the resulting Cr(III) with the amino group promoted adsorption, thus achieving detoxification of Cr(VI) in wastewater. After eight recycling experiments, the Cr(VI) removal efficiency of this material is still more than 90%, indicating that this material has excellent stability and good application potential. Therefore, this magnetic adsorbent offers a potential solution for the successful handling of chromium-containing wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tingting Yan,Senlin Deng,Gang Wang,Jie Li,Wei Chang,Guoliang Zhang,Chunshan Li
Acid-base bifunctional Cs-Zr supported SiO 2 exhibit high catalytic performance on aldol condensation of methyl propionate (MP) and formaldehyde (FA) toward methyl acrylate (MMA). However, the effect of structural configuration of surface active sites on the formation rate and selectivity of MMA remains unclear. In this study, a surface engineering strategy was proposed to directionally induce the formation of catalytically active centers. Comprehensive characterizations were performed to identify the structural configuration of surface active Cs and Zr sites and their influence on MMA production in combination with catalytic evaluation. It was discovered that the increased density of isolated hydroxyl groups (≡Si-OH) on SiO 2 support after calcination treatment promoted the formation of well-defined Si-O-Zr and Si-O-Cs structures, corresponding to the medium strong acid and weak base sites. The acid-base properties and their balance of as-prepared Cs/Zr/SiO 2 catalyst could be controllably modulated by the surface hydroxyl density and Cs (Zr) loading. These highly dispersed Cs and Zr species generated through the strong interaction with hydroxyl groups facilitated the production of MMA while suppressed the undesired Methylacrolein (MAL). Consequentially, the formation rate and selectivity of MMA could reach up to 0.91 mmol/h/g Cat. and 94.3 % on the optimal 1.5Cs/0.25Zr/SiO 2 catalyst. Further mechanistic studies using In-situ DRIFT revealed the catalytic pathway toward MMA and MAL, confirming the activation of MP was the kinetic-relevant step.
研究领域:
催化化学
·
材料化学
·
表面科学
·
有机合成
·
工业催化
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2020
·Vol. 32
·期 42
·2004630
·
IF 27.398
Minchao Qin,Haibo Xue,Hengkai Zhang,Hanlin Hu,Kuan Liu,Yuhao Li,Zhaotong Qin,Junjie Ma,Hepeng Zhu,Keyou Yan,Guojia Fang,Gang Li,U-Ser Jeng,Geert Brocks,Shuxia Tao,Xinhui Lu
Two-step-fabricated FAPbI 3 -based perovskites have attracted increasing attention because of their excellent film quality and reproducibility. However, the underlying film formation mechanism remains mysterious. Here, the crystallization kinetics of a benchmark FAPbI 3 -based perovskite film with sequential A-site doping of Cs + and GA + is revealed by in situ X-ray scattering and first-principles calculations. Incorporating Cs + in the first step induces an alternative pathway from δ-CsPbI 3 to perovskite α-phase, which is energetically more favorable than the conventional pathways from PbI 2 . However, pinholes are formed due to the nonuniform nucleation with sparse δ-CsPbI 3 crystals. Fortunately, incorporating GA + in the second step can not only promote the phase transition from δ-CsPbI 3 to the perovskite α-phase, but also eliminate pinholes via Ostwald ripening and enhanced grain boundary migration, thus boosting efficiencies of perovskite solar cells over 23%. This work demonstrates the unprecedented advantage of the two-step process over the one-step process, allowing a precise control of the perovskite crystallization kinetics by decoupling the crystal nucleation and growth process.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Chao Wang,Zhengguang Yan,Lin Ma,Jiawen Xiao
Advanced optical information encryption usually relies on the integration of multicolor, stimulus-responsive, and afterglow luminescence. However, achieving these simultaneously within a single-phase system has posed challenges, complicating the design process. In this study, an advanced 3D information encryption strategy is presented based on undoped and alloyed Cs₂CdCl₄, encrypted through three distinct channels: emission wavelength, water stimulation, and afterglow time. Specifically, Mn 2+ , Sb 3+ , and Ag + doped Cs₂CdCl₄ single crystals are successfully synthesized via a modified hydrothermal method, which exhibit bright orange, green, and blue emissions, respectively. Decryption of specific information can be achieved by employing corresponding narrowband filters. Furthermore, the Cs₂CdCl₄ system demonstrates hydrochromism, attributed to water-induced sequential phase transitions. Upon water treatment, the 2D Cs₂CdCl₄ will undergo a phase transition to Cs 3 Cd 2 Cl 7 , and finally to cubic CsCdCl 3 . Interestingly, the resultant CsCdCl 3 exhibits pronounced afterglow, originating from the triplet emission of Cd ions. Leveraging these unique properties, a highly secure and adjustable 3D encrypted quick response code is designed. The encrypted information is encoded in coordinates, and decrypted information can be retrieved in both compressed and decompressed modes as required. These findings pave the way for the development of novel smart photonic materials and multimodal optical information encryption.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）