JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2025
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IF 3.1
Mumtaz Nighat,Li Yanchun,Artiaga Ramón,Guo Qian,Mumtaz Amina
A major challenge in polymer composite research is accurately predicting thermal degradation behavior under different heating conditions while effectively distinguishing primary polymer decomposition from filler-related mass loss. This study introduces a novel approach by employing a logistic derivative function fitting method, which allows for the clear separation of magnesium hydroxide (MH) dehydration from the main degradation of linear low-density polyethylene (LLDPE). Understanding the thermal stability of LLDPE composites is crucial for enhancing fire safety and long-term durability in industrial applications. This study investigates the effect of MH and multi-walled carbon nanotubes (MWCNTs) on the thermal degradation of LLDPE under a nitrogen atmosphere, using non-isothermal thermogravimetric analysis (TGA). Pure LLDPE (PE), LLDPE/MH (mPE), and LLDPE/MH/MWCNTs (mcPE) composites were tested at four heating rates (5, 10, 15, and 20 K min –1 ). The degradation kinetics were analyzed using ASTM E698 and Ozawa–Flynn–Wall classical methods, alongside a logistic-based model that enhances the accuracy of degradation predictions. The results revealed that while the main degradation process of LLDPE remains largely unchanged, secondary degradation reactions were effectively suppressed by the fillers. Additionally, the logistic model allowed for accurate estimation of degradation behavior at untested heating rates. This methodology provides a powerful tool for optimizing polymer composite formulations, particularly in cable insulation and fire-retardant coatings, where enhanced thermal stability is essential for safety and material longevity.
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MICROCHIMICA ACTA
·
2010
·Vol. 171
·期 3
·385-392
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IF 2.648
Yin Huanshun,Zhou Yunlei,Liu Tao,Cui Lin,Ai Shiyun,Qiu Yanyan,Zhu Lusheng
An amperometric biosensor for nitrite was prepared by immobilizing cytochrome c (Cyt c) on a gold electrode that was modified with Nafion and a Cu-Mg-Al layered double hydroxide (Cu-LDH). The Cu-LDH was characterized by Fourier transform infrared spectroscopy and powder X-ray diffraction. The UV-visible spectrum suggests that Cyt c retains its native conformation in the modified film. The direct electrochemical investigation indicated that the composite film represents a good platform for the immobilization of Cyt c as well as an excellent promoter for the electron transfer between Cyt c and the gold electrode. Moreover, the biosensor showed a remarkable bioelectrocatalytic activity for the oxidation of nitrite with a linear range from 0.75 to 123 μM. The detection limit is 2 × 10 −7 M (S/ N = 3). The biosensor was successfully applied to the determination of nitrite in food samples.
研究领域:
生物分析化学
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电化学传感
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食品分析
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生物传感器
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分子诊断
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SEMICONDUCTOR SCIENCE AND TECHNOLOGY
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2023
·Vol. 38
·期 9
·095012
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IF 1.9
Ming Li,Ruohe Yao,Yurong Liu
Development of high-performance nano-ZnO based piezoelectric tactile sensors with outstanding sensitivity, good linearity, flexibility, durability and biocompatibility has a great significance for smart robotics, human healthcare devices, smart sensors and electronic skins. A flexible piezoelectric pressure sensor with a sandwich structure was fabricated by using PI/Cu film as top and bottom electrodes, Mg-doped ZnO nanorods (MZO NRs) as sensing layer and polydimethylsiloxane polymer as charge coupling layer. The MZO NRs were synthesized by a one-step hydrothermal method and their structure, morphology and defect states were characterized by using scanning electron microscopy, atomic force microscope and x-ray photoelectron spectroscopy. The piezoelectric properties of the flexible tactile sensors based on MZO NRs hydrothermally synthesized from different Mg2+/Zn2+ molar ratios were investigated comparatively by evaluating their force response actions. The results indicate that the sensors exhibit a linear response in the range of 0–1 N. The device based on MZO NRs can achieve an ultra-high sensitivity of 3.1 V N−1 (308.5 mV kpa−1) due to higher piezoelectric coefficient of MZO NRs, which is about five times higher than that of the undoped ZnO NRs sensor. Moreover, the sensor shows excellent stability and durability by loading 2500 cycles of pressing. It is demonstrated that the sensor can used to accurately monitor human motion status and vital signs in real time, such as facial motion, joint movement, wrist pulse, cervical artery, and heartbeat.
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Surfaces and Interfaces
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2023
·
IF 6.2
Lei Zhou,Xiangyu Xi,Haidong Li,Han Song,Qiong Mei,Yuankun Yang,Shu Chen,Qunwei Dai,Faqin Dong
Vanadium contamination has gained increasing attention around the world and it is urgent to develop feasible approach to tackle this growing pollution (e.g., vanadate). Herein, density functional theory (DFT) calculations combined with batch experiments were used to systematically evaluate the capacity of Mg(OH) 2 to adsorb vanadate , by investigating the impacts of different exposed facet and surface OH defect on the structure configurations, adsorption energy and the efficiency of vanadate adsorption. DFT calculations suggested that although the capacity of vanadate adsorption on the facets of Mg(OH) 2 would be obviously influenced by the formation of various coordination complex (e.g., monodentate, bidentate and tridentate) on each facet, the capacity for these facets of Mg(OH) 2 towards vanadate adsorption followed the order: (100) > (001). Moreover, such a vanadate adsorption was further enhanced by the presence of surface OH defect, owing to altered densities of states (DOS) of the adsorption site. Batch experiments verified the defect-rich Mg(OH) 2 was favorable to adsorb vanadate, and both (001) and (100) facet play the great roles. This molecular-level understanding of the facet-dependent and defect-enhanced adsorption behavior of Mg(OH) 2 toward vanadate provides a useful insight into designing and applying effective adsorbents for the removal of heavy metal oxyanions.
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CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Yingjie Fan,Jingli Li,Jingwen Lv,Xinyu Zeng,Quan Li,Yan Yan,Chunlin Song,Gang Liu,Zhanbing He
Lead-free relaxor ferroelectric ceramics 0.95Na 0.425 Bi 0.425 Ca 0.15 TiO 3 -0.05 Mg with different polyvinyl alcohol contents (NBCT-Mg- x PVA) were prepared by viscous polymer processing to generate high density and induce high breakdown strength (BDS) and high recoverable energy storage density ( W rec ). The rheology properties of the ceramic pastes had been systematically studied. The content of PVA has exhibited a great influence on the microstructure and property of ceramics. Through the analysis of ceramics with different PVA contents, it is found that the less PVA content, the less pores and greater BDS on the premise of film formation. The related other electrical performances of the resulting ceramics have also been performed. Especially for the NBCT-Mg-0.4PVA ceramics, the BDS of it reached as high as 320 kV/cm, and the W rec was 4.51 J/cm 3 , which also exhibited excellent temperature stability (30–135 °C) and frequency stability (0.2–50 Hz), as well as good stability during charged-discharged process and achieve high power density.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 13
·3974-3986
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IF 5
Meng Xia,Zheng Shen,Shaoze Xiao,Minyan Gu,Yalei Zhang
During the catalytic transformation of biomass into valuable chemicals, enhancing the yield of target products and inhibiting undesirable reactions are vital but challenging. In this study, a facile and efficient method for synthesizing a hierarchical bimetallic Mg–Sn-Beta-H zeolite was developed. Using this method, the simultaneous fabrication of catalytically active sites and hierarchical structures was achieved. Selective experiments and kinetic analysis confirmed that the catalytically active sites and hierarchical structures in the catalyst exhibited a clear synergistic effect on the transformation of glucose into lactic acid with a high yield of 62.7%, and the lactic acid yield remained above 58% after reusing the catalyst four times. An in-depth analysis of the synergistic catalysis mechanism demonstrated that strong and weak Lewis acidity in the catalytically active sites promoted the main reaction steps, including isomerisation and retro-aldol condensation, whereas the hierarchical structure induced by the introduction of magnesium into the parent Sn-Beta zeolite regulated the main reaction steps and suppressed the side reactions. The coupling of multifunctional active sites and hierarchical structures provides a new strategy for addressing the challenges of commercial lactic acid production.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yang Chen,Guomin Xia,Hong Yan,Yong Xin,Honggun Song,Chao Luo,Hongyu Guan,Chassagne Luc,Zhi Hu
Corrosion inhibitors, have the characteristics of environmental friendly and high efficient, are widely used to inhibit the corrosion of alloys; however, their corrosion inhibition mechanism and adsorption behavior is still unclear. Herein, a cationic dye (1,8-naphthalenimide, NP) is synthesized for fluorescent visualisation of the sodium dodecyl sulfate (SDS) adsorption behavior on the α-Mg and β-Li phases. In-situ observation showed that obvious fluorescence adsorption preferentially appeared on the α-Mg phase via physicochemical adsorption. Moreover, stronger fluorescence intensity was observed on the local corrosion sites due to the precipitation of Mg-SDS complex. Micro-scale in situ observation under electrochemical control is applied to explain the inhibition mechanism from the perspective of corrosion kinetics. The inhibition efficiency is evidently improved (>90%) after the addition of SDS, and the optimum value reaches 95.1% at the SDS concentration of 0.04 M. Surface characterizations are conducted to validate the adsorption behaviour of SDS on the Mg alloy surface. The inhibition mechanism of SDS is proposed by experimental and theoretical calculations. This work advances the development and application of specific fluorescence tracking to elucidate the adsorption behaviour of corrosion inhibitors at the micro-level and provides a new idea for the development of efficient corrosion inhibitors.
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ACS Sustainable Chemistry & Engineering
·
2021
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IF 8.198
Xiaoqing Cao,Jun Zhou,Zhipeng Zhai,Song Li,Guo Yuan,Gaowu Qin
Development of efficient and sustainable monolithic catalysts for NaBH4 hydrolysis remains an important goal for hydrogen cycling. In this work, the structured catalyst Ru/MgO with an on–off feature has been prepared by directly growing a nano-Ru-embedded MgO coating layer on a Mg substrate via an instant high-temperature plasma oxidation process. The porous MgO framework provides an ideal space for the access of reactants and diffusion of mass transport, which facilitates reaction triggering and the expulsion of byproducts to avoid poisoning the catalyst. Importantly, Ru nanoparticles (NPs) are monodisperse with ultrasmall particle size deriving from a concurrent rapid arcing and fast quenching. The hierarchical structured Ru NP catalysts are highly active for hydrolysis of sodium borohydride by achieving a high hydrogen generation rate (HGR) of 101,189 mL min–1 g–1 and exhibit attractive stability. In addition, it is facile to realize the “on–off” functionality based on simple separation that could accurately control the hydrogen generation, suggesting the structured catalyst to be of great potential for practical applications. This simple method opens valuable opportunities for fast synthesis of the high-quality structured catalyst and could be extended to various noble metals on oxides of valve metals with high catalytic performance.
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SURFACE ENGINEERING
·
2021
·
IF 3.169
Hanaa Soliman,Abdel Salam Makhlouf,Guojiang Wan
Since the bioactive surface needs hydrophilic coating; and the high corrosion resistance needs a hydrophobic one, it is a challenge to design a bioactive film that exhibits corrosion protection. In this article, Hexa-Methylene Diamine Tetra-Methylene Phosphonic Acid (HMDTMPA) film was deposited on Mg substrate at different heat treatment conditions. The heat-treated films at 150°C showed remarkable anticorrosion performance about five times the non-heated film. In addition, bioactivity character such as live cells attraction was noticed due to the increase of P–O groups that compensated the decrease of O–H groups in the film structure. Through the post-heat treatment, we were able to provide a new insight towards understanding how particular functional groups (OH) can modify the organic coating quality. The master key here is the formation of a stable film of chloroapatite that plays dual functions to inhibit the corrosive ions penetration and improve the bioactivity to attract the living-cell.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Hui Yong,Xin Wei,Yanhao Wang,Shihai Guo,Zeming Yuan,Yan Qi,Dongliang Zhao,Yanghuan Zhang
To improve hydrogen storage property of Mg-based alloy, the Mg–Ce–Y–Ni + 10 wt % M (M = Zr, Ti, V) composites were prepared by the combination of alloying and ball-milling, and their microstructure, phase evolution, as well as hydrogen storage thermodynamic and kinetic properties, were investigated by XRD , PCT, and DSC methods. The result shows that the hydrogenated samples are composed of MgH 2 , Mg 2 NiH 4 and corresponding ZrH 2 , TiH 2 and VH 1.9 phases. In comparison, the |Δ H| value of M = Ti sample is larger than that of M = Zr and M = V samples, and the M = Ti sample has the highest the peak temperatures and lowest plateau pressure, which indicates that Zr and V elements are more efficient to reduce the thermodynamic stability of RE-Mg-Ni hydrogen storage alloys. Besides, the DSC curve of the M = V sample has another endothermic peak which corresponds to the decomposition reaction between VH 1.9 and VH 0.8 , which has a contribution to desorption kinetic property for the M = V sample. The apparent activation energies ( E de ) show an increasing trend in the following order: M = Zr (87.7 kJ/mol) < M = V (89.1 kJ/mol) < M = Ti (99.3 kJ/mol).
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2021
·
IF 5.268
Weijie Li,Ya Su,Liang Ma,Shijie Zhu,Yufeng Zheng,Shaokang Guan
To improve the service performance of vascular stents, we designed/selected a series of organic compounds from commercial drugs, natural plants, and marine life as the potential corrosion inhibitors for ZE21B alloy. Paeonol condensation tyrosine (PCTyr) Schiff base was found to be the most efficient inhibitor among them. The biocompatible, self-healing, anti-corrosive sol-gel coating loaded with corrosion inhibitor was fabricated on the Mg substrate through a convenient dip-coating tactic. The corrosion resistance, self-healing ability, cytotoxicity, and hemocompatibility of the coated sample were evaluated. These results suggested the potentiality of Schiff base inhibitor-loaded sol-gel coating for enhanced corrosion protection and desired biocompatibility of bioabsorbable cardiovascular implants.
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PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Changhao Yan,Shouteng Zheng,Na Chen,Shouqi Yuan,Yao Chen,Bing Li,Yunlei Zhang
In this work, the novel acid-base bi-functional mesoporous SBA-15 catalysts with four kinds of morphologies were synthesized by Mg incorporated and sulfated zirconia (SZ) grafted. The introduction of Mg to mesoporous SBA-15 materials significantly improves the strength of the base. And the supported SZ group exhibit effective Brønsted/Lewis acid strength. The physical and chemical properties of the prepared materials were systematically analyzed by the characterization tests of SEM, TEM, XRD , N 2 adsorption-desorption of, FT-IR, TGA , XPS, NH 3 /CO 2 -TPD and in-suit PY-IR. The obtained catalysts of SZ@Mg-SBA-15 could be applied to the fructose conversion into 5-hydroxymethylfurfural (5-HMF) with the co-solvent system of iPrOH/DMSO ( v / v = 9:1). 5-HMF was achieved under the optimal reaction condition with the highest yield of 98.6%. The result shows that the reaction of fructose dehydration into 5-HMF could be caused by the combination of Brønsted acid site and basic site. This work developed reaction system could avoid the large use of environmentally dangerous solvents, and provides a new economical and feasible method for the large-scale conversion of fructose biomass.
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