IEEE SENSORS JOURNAL
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2026
·
IF 4.5
Weiwei Qin,Xuefeng Hu,Ming Zhou,Jilei Yang,Jiaming Liu,Peipei Li,Xiaoliang Wang,Liping Tan,Yali Bi,Wenjuan Yu,Wei Zhang
The detection of hydrogen-methane (H2-CH4) in exhaled breath takes on paramount importance for small intestinal bacterial overgrowth (SIBO) diagnosis. However, the concentrations of H2 and CH4 associated with SIBO are significantly lower, reaching only 20 and 12 ppm, respectively. Furthermore, the detection of these gases can be compromised by the presence of various volatile organic compounds (VOCs) and relative humidity (RH) in exhaled breath. In this study, a low-powered system with three high-performance tin dioxide (SnO2)-based micro-electro-mechanical system (MEMS) gas sensors for H2-CH4-VOCs detection was modified by magnetron sputtering deposition and coating, which are named as Pd/SnO2-M (M means magnetron), Pd/SnO2-C (C means coating), and SnO2-D (D means multiple doping), respectively. Particularly, the Pd/SnO2-M sensor shows excellent selectivity, high sensitivity, and low detection limitation (down to 0.033 ppm) toward H2, which is attributed to the compact grains of the film and the Pd catalysis for the dissociation of H2 molecule into two active hydrogen atoms better than other gases. In addition, the Pd/SnO2-C sensor exhibits high sensitivity and low detection limitation toward H2 (down to 0.186 ppm) and CH4 (down to 1.1 ppm) since doped Pd also gives rise to adsorbed oxygen species (Oads) above the SnO2 surface besides its catalysis. Moreover, the assembled MEMS sensor array system demonstrates gas recognition capability based on linear discriminant analysis (LDA) under controlled single-gas conditions in high-humidity environments. Then, the as-modified MEMS sensor array system is a promising platform for H2-CH4 detection.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhangyi Huang,Jiaochun Zheng,Yutong Zhang,Yang Shi,Junjing Duan,Ruichong Chen,Tiecheng Lu,Zhijun Wang,Jianqi Qi,Haomin Wang
Gd 2 Zr 2 O 7 (GZO)-based ceramic waste form has attracted broad interest due to its potential applications in the long-term disposal of high-level nuclear waste . However, its high-capacity isomorphic immobilization and leaching mechanism are not well understood yet. Herein, GZO-based waste form with a single pyrochlore phase and homogeneous element distribution, achieving an isomorphic waste load as high as 50 wt%, was fabricated successfully. Isomorphism failure of the waste form is due to the Ln 6 MoO 12 (Ln is lanthanides) formation and direct precipitation of PdO from the oversaturated solid solution. Chemical durability tests showed that the 42-day leaching rates of nearly all elements in the waste form with the maximum waste load were only between 10 −6 and 10 −5 gm −2 d −1 . The leaching of 0.5SW·0.5GZO over a period of 42 days is primarily controlled by dissolution, leading to a gradual restructuring of the surface in two distinct stages: the formation of an amorphous passivation film and the agglomeration of amorphous precipitates. Notably, the formation of the amorphous passivation film stands as the primary factor influencing the leaching rate of the waste form.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhangyi Huang,Wanying Guo,Yang Shi,Ruichong Chen,Zhijun Wang,Yutong Zhang,Junjing Duan,Jianqi Qi,Haomin Wang
The Gd 2 Zr 2 O 7 (GZO)-based ceramic waste form exhibits promising potential for radioactive waste immobilization. However, the isomorphic immobilization capacity and irradiation effects of GZO-based ceramic waste forms with varying waste loads remain inadequately understood. This study employed a facile combustion method to synthesize ceramic powders and utilized conventional sintering with a relatively short dwelling time to fabricate GZO-based ceramic waste forms. We investigated the isomorphic immobilization behavior and He ion irradiation effects of the synthesized waste forms. The outcomes demonstrate that GZO effectively immobilizes simulated waste composed of 11 types of oxides, achieving a waste load as high as 50 wt% with a single pyrochlore phase and homogeneous element distribution. Under He + irradiation, aggravated structural degradations, including exacerbated lattice swelling, increased amorphization degree, and premature He bubble chain/microcrack formation, were observed in GZO-based waste forms with an increasing waste load.
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Polymers
·
2023
·Vol. 15
·期 12
·2623
·
IF 5
Jiadong Wang,Min Wang,Chenxin Xu,Yang Han,Xuan Qin,Liqun Zhang
The development of damping and tire materials has led to a growing need to customize the dynamic viscoelasticity of polymers. In the case of polyurethane (PU), which possesses a designable molecular structure, the desired dynamic viscoelasticity can be achieved by carefully selecting flexible soft segments and employing chain extenders with diverse chemical structures. This process involves fine-tuning the molecular structure and optimizing the degree of micro-phase separation. It is worth noting that the temperature at which the loss peak occurs increases as the soft segment structure becomes more rigid. By incorporating soft segments with varying degrees of flexibility, the loss peak temperature can be adjusted within a broad range, from −50 °C to 14 °C. Furthermore, when the molecular structure of the chain extender becomes more regular, it enhances interaction between the soft and hard segments, leading to a higher degree of micro-phase separation. This phenomenon is evident from the increased percentage of hydrogen-bonding carbonyl, a lower loss peak temperature, and a higher modulus. By modifying the molecular weight of the chain extender, we can achieve precise control over the loss peak temperature, allowing us to regulate it within the range of −1 °C and 13 °C. To summarize, our research presents a novel approach for tailoring the dynamic viscoelasticity of PU materials and thus offers a new avenue for further exploration in this field.Keywords:micro-phase separation;polyurethane;dynamic viscoelasticity;diols
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Yutong Zhang,Zhangyi Huang,Jianqi Qi,Zhe Tang,Lang Wu,Kuibao Zhang,Tiecheng Lu
In this work, 0.5TRPO•0.5Gd 2 Zr 2 O 7 ceramic with an average grain size of only ∼15 nm was prepared by a high pressure (5 GPa/520 °C) sintering method. Phase evolutions and microstructure changes of the as-fabricated super nano and micron-grained ceramics under a high-dose displacement damage induced by 300 keV Kr 2+ ions were investigated. The results show that the super nano-grained ceramic has low degree of amorphization , obvious grain growth (2–3 times in grain size) and big Kr bubbles (10–68 nm) formation after irradiation. The micron-grained ceramic was severely amorphized after irradiation and many microcracks were formed parallel to its surface. The formation mechanism of Kr bubbles in the super nano-grained ceramic is on account of grain boundary diffusion and migration induced by the accumulation of the injecting Kr ions and irradiation defects. Nevertheless, microcracks formed in the micron-grained sample are caused by the accumulation of Kr atoms.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 13
·47291
·
IF 1.901
Zhen Jia,Jinggang Wang,Liyuan Sun,Fei Liu,Jin Zhu,Xiaoqing Liu
A series of poly(propylene- co -1,4-cyclohexanedimethylene 2,5-furandicarboxylate)s (PPCFs) with different compositions were synthesized from bio-based aromatic monomer 2,5-furandicarboxylic acid and 1,3-propanediol (PDO), along with 1,4-cyclohexanedimethylene (CHDM). The chemical structure, composition, and sequence distribution of PPCFs were determined by nuclear magnetic resonance ( 1 H NMR and 13 C NMR). Results showed that the compositions of copolyesters depended on the feed molar ratio of PDO and CHDM, and all the obtained PPCFs copolyesters had triad component in a random sequential structure. With the addition of CHDM, the gas barrier properties of poly(propylene 2,5-furandicarboxylate) (PPF) deteriorated. However, when the content of CHDM reached 79%, PPCF79 still showed the CO 2 and O 2 barrier improvement factor of 4.5 and 3.25, respectively, which were better than those of poly(ethylene naphthalate), a well-known polymer with barrier property. Besides, PPCF79 showed good performance on tensile modulus, tensile strength, elongation at break, and the crystallization enthalpy was improved from 3.2 J g −1 for PPF to 30.7 J g −1 for PPCF79. It has the potential to serve as a promising bio-based polymer with excellent comprehensive performance. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47291.
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REACTIVE & FUNCTIONAL POLYMERS
·
2013
·
IF 2.505
Li Zhang,Yakai Feng,Hong Tian,Changcan Shi,Miao Zhao,Jintang Guo
Novel biodegradable amphiphilic ABA triblock copolymers , i.e. poly(3(S)-methyl-morpholine-2,5-dione- co - p -dioxanone)-block-poly(ethylene glycol)-block-poly(3(S)-methyl-morpholine-2,5-dione- co - p -dioxanone) [P(MMD- co -PDO)- b -PEG- b -P(MMD- co -PDO)], were successfully prepared by ring-opening polymerization of 3(S)-methyl-morpholine-2,5-dione (MMD) and p -dioxanone (PDO) in the presence of poly(ethylene glycol) 6000 as an initiator. These triblock copolymers were characterized by 1 H NMR, 13 C NMR, Fourier transform infrared, gel permeation chromatography and differential scanning calorimetry measurements. P(MMD- co -PDO)- b -PEG- b -P(MMD- co -PDO) could self-assemble into stable nanosized microspheres with critical micellar concentrations of 0.41–0.66 μg/mL. The microspheres showed high hydrolytic degradation. In addition, doxorubicin (DOX) was chosen as a model drug and successfully encapsulated into the microspheres by hydrogen-bond interaction and hydrophobic effect . The transmission electron microscopy and dynamic light scattering measurements revealed that these microspheres were ellipsoidal nanoparticles with diameters ranged from 50 to 100 nm. These copolymer microspheres exhibited high loading capacity (LC), encapsulation efficiency (EE) of DOX and sustained drug release behavior in phosphate buffered solution (PBS). Moreover, the release rate of DOX from those microspheres in pH 4.0 PBS was faster than that in pH 7.4 due to pH sensitivity of the polymer–drug systems and the degradation of the matrix polymers . These amphiphilic depsipeptide multiblock copolymers would be potential promising carriers for anti-tumour drug delivery.
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2013
·Vol. 51
·期 15
·3213-3226
·
IF 3.543
Li Zhang,Yakai Feng,Hong Tian,Miao Zhao,Musammir Khan,Jintang Guo
Well-defined amphiphilic multiblock copolymers PDMAEMA-b-P(IBMD- co -PDO)-b-PEG-b-P(IBMD- co -PDO)-b-PDMAEMA [PDMAEMA-PIBMD-PPDO-PEG], based on poly(2-(dimethylamino)ethyl methacrylate) block (PDMAEMA), poly(3( S )-isobutyl-morpholine-2,5-dione- co-p -dioxanone) block (P(IBMD- co -PDO)), and poly(ethylene glycol) block (PEG) were successfully synthesized by combination of ring-opening polymerization (using 3( S )-isobutyl-morpholine-2,5-dione and p -dioxanone initiated by hydroxyl end of PEG) and atom transfer radical polymerization (ATRP). Furthermore, all these copolymers were characterized by 1 H NMR, 13 C NMR, Fourier transformed-infrared, gel permeation chromatography, differential scanning calorimetry, and thermogravimetric analysis measurements. The degradation experiments showed that the molecular weight of PDMAEMA-PIBMD-PPDO-PEG decreased along with degradation time. In addition, these copolymers could readily self-assemble into nanosized microspheres in phosphate buffered solution. Ibuprofen (IBU) and doxorubicin (DOX) as a kind of combined model drugs were loaded into these microspheres by the combination of ionic interaction and hydrophobic effect. These copolymer microspheres exhibited high loading capacity (LC, up to 26.88%), encapsulation efficiency (EE, up to 61.29%), and sustained release behavior of IBU–DOX in phosphate buffered solution. The results of transmission electron microscopy and dynamic light scattering showed that the microspheres were well-defined uniform spherical particles with average diameter less than 120 nm. Therefore, it can be envisaged that these copolymer systems are promising candidates for controlled release application. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 3213–3226
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高影响因子
ACS Omega
·
2017
·
IF 0
Weikeng Luo,Jiaxiang Qin,Min Xiao,Dongmei Han,Shuanjin Wang,Yuezhong Meng
High-molecular-weight poly(propylene carbonate) (PPC) [number-average molecular mass (Mn): 80 000–100 000] is readily alcoholized into PPC macrodiols in the presence of 1,2-propanediol (PDO), 1,4-butanediol (BDO), or 1,6-hexanediol (HDO). The high-molecular-weight PPC and small amount of diols, such as PDO, BDO, or HDO, were stirred at elevated temperatures to convert the extremely viscous high-molecular-weight polymer to low-molecular-weight macrodiols with gel permeation chromatography-measured Mn of about 3000 Da. The chopping reaction of the high-molecular-weight PPC was studied in detail, such as the influences of the catalyst residue, the kinds of alcoholysis agents, reaction temperature, and time. The reaction mechanism of alcoholysis is proposed according to the experimental results. The results indicate that the presence of a trace residue of zinc catalyst (Zn-G-III) in PPC, excess diol feeding, and higher temperature can accelerate the alcoholysis. Moreover, different diols can produce different PPC macrodiols with varying end-capping. Finally, polycarbonate ether urethane can be successfully synthesized using as-synthesized PPC macrodiols and poly(propylene glycol) (Mn ≈ 3000) as the soft segment and 4,4′-diphenylmethane diisocyanate or BDO as the hard segment. The full evaluation for the synthesized PPC macrodiols demonstrates their potential applications in the polyurethane industry.
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RSC Advances
·
2024
·Vol. 14
·期 25
·17440-17447
·
IF 3.9
Kai Lu,Xinyi Shen,Yunhai Shi,Zejian He,Dahong Zhang,Mi Zhou
The Biginelli reaction, a three-component cyclocondensation reaction, is an important member of the multicomponent reaction (MCR) family. In this study, we conducted end-group modifications on a variety of biodegradable polyesters, including poly(1,4-butylene adipate) (PBA), poly(ε-caprolactone) (PCL), polylactic acid (PLA), and poly(p-dioxanone) (PPDO), based on the precursor polyethylene glycol (PEG). By combining two polymers through the Biginelli multi-component reaction, four new biodegradable polyester copolymers, namely DHPM–PBA, DHPM–PCL, DHPM–PLA, and DHPM–PPDO, were formed. These Biginelli reactions demonstrated exceptional completeness, validating the efficiency of the synthesis strategy. Although the introduction of various polyesters lead to different properties, such as crystallinity and cytotoxicity, the newly synthesized 3,4-dihydro-2(H)-pyrimidinone compounds (DHPMs) exhibit enhanced hydrophilicity and can self-assemble in water and N,N-dimethylformamide (DMF) solution to form micelles with a controllable size. Furthermore, DHPM–PPDO promotes cellular growth and has potential applications in wound healing and tissue engineering. In conclusion, this method demonstrates great universality and methodological significance and offers insights into the medical applications of polyethylene glycol.
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高影响因子
Nature Synthesis
·
2025
·
IF 20
Wu Bei,Liu Xiaocheng,Liu Peigen,Wu Geng,Tian Lin,Han Xiao,Li Junmin,Hong Xun
Amorphous metal oxide (AMO) nanomaterials are attractive because of their unique short-range order structure, but controllable synthesis is still challenging. Here we report a Li + -assisted liquid-phase reduction method, which converts a series of crystalline metal oxides into amorphous structures (RuO x , PtO x , CuO x , NiO x , PdO x , MnO x and NiCoO x ). Taking RuO 2 as an example, in situ Raman and X-ray absorption spectroscopy indicate that the reduction of Ru–O coordination number and distortion of the medium-range structure of Ru–Ru during the amorphization process are caused by naphthalene radical anions and lithium ions. Theoretical calculations indicate that Li⁺ insertion in RuO x strengthens its electrostatic interaction with the naphthalene radical anion, accelerating the stripping of oxygen from Li⁺-inserted RuO x . The introduction of positive charge by Li⁺ insertion can disrupt the internal charge balance of crystal ruthenium oxide, and therefore reduce the formation energy of intermediates for producing amorphous RuO x . This strategy paves a way for achieving the controllable synthesis of AMOs.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Qi Zhao,Fei Wu,Junyi Wang,Pengyuan Gao,Kaimin Shih
A non‑aqueous separation strategy that combines acetonitrile (ACN) with 1, 3‑propanediol (PDO) is presented for the 90 yttrium(III)/ 90 strontium(II) (Y(III)/Sr(II)) separation. In an initial dissolution step, the ACN-PDO mixture displays a pronounced solubility contrast between Y nitrate (1.22 g/100 g) and Sr nitrate (0.09 g/100 g), enabling the selective dissolution of trace Y(III) while Sr(II) remains largely undissolved. Furthermore, ACN-PDO mixture also exhibits favorable physicochemical properties, e.g., relatively low viscosity (about 40 mPa·s), a suitable density difference (0.25 g/cm 3 ) from n -octane, and lower miscibility with n -octane, for constituting an extraction system with N,N,N’,N’ tetra-octyl-3-oxopentanediamide in n -octane, in which both Y(III) extraction efficiencies and separation factors greatly exceed those of aqueous-based extraction systems. Density functional theory calculations also confirmed that the Y/Sr separation is more favorable in ACN-PDO/ n -octane systems compared to water/ n -octane systems due to differences in solvation effects and contact ion pairs. A practice integrated separation process achieved a Y(III) recovery of >90 % with product purity exceeding 99 %. The overall decontamination factor (>460,000) is markedly higher than the values reported for existing aqueous‑based methods.
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危险品化学品经营许可证（带存储）