CHROMATOGRAPHIA
·
2018
·Vol. 82
·期 8
·1285-1293
·
IF 1.401
Wang Huimin,Guo Bin,Pang Xiaoya,Yu Huan,Liu Haiyan,Yan Hongyuan,Han Dandan,Guo Huaizhong,Bai Ligai
A poly(NMA-ST- co -TAIC-EDMA) monolithic column was prepared by redox initiation method using N -methylolacrylamide (NMA) and styrene (ST) as co-monomers. The composite monolith was characterized by scanning electron microscopy (SEM) and nitrogen adsorption–desorption isotherm and was used as a solid phase extraction (SPE) absorbent for enrichment of β -sitosterol by high performance liquid chromatography (HPLC). Under the optimum conditions for extraction and determination, the calibration equation was y = 1.02247 x + 0.1766; the linear range was 0.015–0.75 mg mL −1 and the linear regression coefficient was 0.998. The limit of detection (LOD) and the limit of quantification (LOQ) were 0.006 mg mL −1 and 0.02 mg mL −1 , respectively. The spiked recoveries of β -sitosterol in edible oil samples were 83.60–103.88%; precisions for intra-day and inter-day assays presented as relative standard deviations were less than 6.0% and 6.2%, respectively. The enrichment factor of β -sitosterol was 60 and the results showed that the monolithic column had high selectivity and good permeability as an on-line SPE absorbent for the enrichment and determination of β -sitosterol from edible oils.
研究领域:
分析化学
·
食品科学
·
材料科学
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DOI
高影响因子
Biosensors-Basel
·
2026
·Vol. 16
·期 6
·303
·
IF 6.2
Yu Chen,Lina Dong,Hengyan Tian,Fei Yang,Dengbang Jiang,Minglong Yuan
Magnetic polymeric microspheres are pivotal solid-phase carriers in chemiluminescence enzyme immunoassays (CLEIA). However, their practical clinical application is frequently hindered by non-specific adsorption, irreversible aggregation, and the intrinsic susceptibility of exposed outermost Fe3O4nanoparticles to oxidation. To overcome these critical bottlenecks, we rationally engineered highly original monodisperseP(St-MMA)@Fe3O4@P(St-MMA) sandwich-structured microspheres. The bespoke amphiphilic outer shell acts as an impenetrable shield against hydration and oxidation, while maintaining a topologically size-matched mesoporous network (average pore size of 13.11 nm) for optimal antibody anchoring. Strikingly, this architecture ensures exceptional long-term colloidal stability, completely preventing macroscopic agglomeration for over six months in buffer solutions. When evaluated in a carcinoembryonic antigen (CEA), CLEIA, our microspheres achieved an ultra-low limit of detection (LOD) of 0.055 ng·mL−1and high analytical recovery (93.37–108.25%). In a head-to-head comparison with industry-standard commercial magnetic beads, the engineered microspheres delivered stronger chemiluminescent signals and lower background noise, demonstrating excellent intra-assay (CV < 4.37%) and inter-assay (CV < 10%) precision. This work establishes a scalable, highly stable materials platform that effectively resolves the persistent oxidation limitations, holding immense practical importance for next-generation ultrasensitive clinical in vitro diagnostics.
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Jie Jiang,Wen-Jun Wang,Bo-Geng Li,Shiping Zhu
The tactics of targeting copolymer composition (CC) and molecular weight (MW) via semibatch controlled radical polymerization (CRP) have been extensively studied. However, little effort is made to target copolymer sequence length (CSL) and its triad sequence, which are among the key microstructures determining material properties of the copolymers. This work presents a method to design and synthesize targeted CSL and copolymer triads in a reversible addition–fragmentation chain transfer radical mini-emulsion copolymerization system (RAFT) through a semibatch chain and sequence model coupled with Alfrey Mayo model. The kinetic model was first derived and correlated with experimental results of the batch St/BA copolymerizations. The semibatch RAFT model was then employed to calculate the feed-rate to target CSL and their triads. St/BA copolymers with different uniform CSLs and their triads are synthesized through the programmed semibatch RAFT mini-emulsion copolymerization processes.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Hui Qiu,Wenxiang Ni,Haihan Zhang,Kai Chen,Jiacheng Yu
Chemical modification of agricultural waste biomass has proved to be an economy and effective approach to capture phosphate ions, except for that under acidic conditions and highly competitive ion systems. According to this, a new nanocomposite (HFO@St+) was fabricated by incorporating nano-sized hydrous Fe(III) oxides (HFO) within aminated wheat straw in order to overcome the bottleneck. The optimal pH of phosphate uptake by HFO@St+ was greatly broadened and observed over a wide pH range between 2.0 and 7.0. The binary exchange reaction indicated that phosphate was strongly and preferably adsorbed by HFO@St+ with the separation factor K of phosphate over nitrate increasing from 0.23–1 or 0.20–0.26 to 2.5–38 or 2.5–15 for near neutral or acidic pHs, respectively. The sorption selectivity for HFO@St+ followed the order of phosphate > nitrate > chloride under experimental conditions. The presence of inorganic and organic ligands (SO 4 and HA) showed no significant effect on phosphate adsorption. XPS and FT-IR analyses were performed to explore the underlying mechanism of adsorption. The exhausted material could be regenerated with NaOH-NaCl solution for at least ten cycles, indicating that HFO@St+ can be used as a sustainable biomass product with excellent adsorption affinity for phosphate removal .
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2019
·
IF 0
Jiawei Liu,Jiahui Liu,Feiyang Ma,Jiguang Liu
Particles with circumstance-responsive conductivity have an appealing performance in constructing sensors. Here, “smart” conducting polyaniline-doped poly(styrene-co-N-isopropylacrylamide) composite spheres, i.e. PANI/P(St-NIPAM) particles, are reported. A series of PANI/P(St-NIPAM) particles can be prepared with different ratios of N-isopropylacrylamide to monomers, i.e. N/M ratios. With the improved N/M ratios in polymerization, the amount of polyaniline (PANI) incorporating into the produced particles increased, resulting in an enhanced conductivity. With the improved N/M ratios, the hydrodynamic diameters of PANI/P(St-NIPAM) particles increased at a low temperature, whereas they decreased at a high temperature; resulting in the enhanced volume-change ability with the increasing poly(N-isopropylacrylamide) (PNIPAM) content in particles. Depending on the temperature-induced volume change, these particles exhibit “smart” conductivity in a homemade device, in which these particles can be used as a temperature-responsive conducting medium to construct an “on–off” circuit, and the switch of an LED lamp can be triggered by temperature. These particles with the smart conducting property provide wide potential applications in sensors, microelectronics, energy storage, and other fields.
研究领域:
材料科学
·
传感器技术
·
高分子化学
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DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Hang Wu,Lei Xie,Liang Zhu,Tengbo Yu,Yingze Zhang
As a common malignant bone tumor in adolescents, osteosarcoma (OS) possesses a very poor prognosis and lacks effective treatments. In this study, we developed a multifunctional nanotherapeutic agent (WSe 2 /AIPH/GOx) that can combine photothermal therapy (PTT) /thermodynamic therapy (TDT) /starvation therapy (ST) against OS. The prepared WSe 2 /AIPH/GOx exhibited a high photothermal conversion efficiency of 37.3% under 808 nm near-infrared laser irradiation, which could effectively eliminate tumor cells. In addition, the local high temperature caused by photothermal heat induces the rapid release and decomposition of AIPH, generating oxygen-independent alkyl radicals that promote tumor cell death in the hypoxic microenvironment. More importantly, the introduction of GOx depletes glucose to starve tumor cells on the one hand, and on the other hand can indirectly increase the thermal sensitivity of cells. In vivo experiments have demonstrated that WSe 2 /AIPH/GOx can effectively inhibit tumor growth in mice due to the combined effects of multiple therapies. Overall, this work provides an effective strategy for potential osteosarcoma treatment based on combination therapies.
研究领域:
肿瘤学
·
纳米医学
·
生物材料学
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DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·
IF 3.9
Hao Yanjun,Zheng Xuecheng,Fan Wei,Chen Siqi,Ye Zhongbin,Tai Lei
In view of the extremely developed bedding of shale formations, which are dominated by micro-nano pores and fractures, traditional sealing agents make it difficult to produce a tight seal on shale formations due to their huge particle sizes. Combining the bridging effect of inorganic nanoparticles and the deformation properties of organic particles, this article synthesized a core-shell structure nano-blocking agent through emulsion polymerization, which was called P(MMA-St-BD)/KH570-SiO 2 . The structure of the synthesized nano-plugging agent was characterized utilizing Fourier transform infrared spectroscopy (FT-IR), particle size distribution, thermogravimetric analysis (TGA), and transmission electron microscopy (TEM). Performance characterization was carried out through the effect of nano-blocking agents on emulsion stability, rheological properties, microporous filter membrane plugging experiments, and core pressure-bearing capacity tests. The findings demonstrate that P(MMA-St-BD)/KH570-SiO 2 ’s structure satisfies design specifications, and that the nano-plugging agent has outstanding thermal stability, homogeneous particle size distribution, and good dispersion. Its decomposition temperature also exceeds 400 °C. This study analyzed the plugging efficiency of nano-blocking agents from the temperature perspective, indicating that the nano-blocking agents seal shale formations tightly. Ultimately, through mechanism analysis, nanomaterials can squeeze and deform through the polymer shell and enter the shale micropores and micro-cracks for sealing, forming a high-strength sealing zone.
研究领域:
材料科学
·
石油工程
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产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 8
·901
·
IF 4.501
Huaigang Su,Ze Zong,Wenjing Lou,Qin Zhao,Xiaobo Wang,Xiang Feng,Yanxing Qi,Zhaoning Song
In this study, Zr active species were implanted into a ZSM-5 zeolite framework to form a solid acid catalyst through steam treatment and the liquid-solid isomorphous substitution process. The as-synthesized Zr-ZSM-5-st catalyst ensured excellent esterification of trimethylolpropane and fatty acids (FAs) to achieve a polyol ester production yield of 94.41%. Combined with N2physisorption, X-ray diffraction, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, transmission electron microscopy mapping, X-ray photoelectron spectroscopy, NH3temperature-programmed desorption, and inductively coupled mass plasma spectroscopy were conducted. The results revealed that the excellent performance of Zr-ZSM-5-st catalyst could be attributed to the enhanced acidity and the developed surface area and pore structure.Keywords:Zr-containing solid acid catalyst;ZSM-5 zeolite;polyol ester;esterification;lubricating ester oils
研究领域:
化学工程
·
催化材料
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DOI
高影响因子
Journal of Advanced Dielectrics
·
2019
·
IF 0
Peng Chen,Leiyang Zhang,Ziyang Wang,Yifei Wang,Chunlin Song,Jinzhu Hu,Gang Liu,Yan Yan
CaO doped 0.5Na 0 . 5 Bi 0 . 5 TiO 3 (NBT)-0.5SrTiO 3 (ST) were prepared by a traditional solid-reaction method under various sintering temperatures. X-ray diffraction (XRD), electron scanning microscopy (SEM), and electrical measurements were employed to check the phases, microstructures, and energy storage properties. The doping of CaO can deeply affect the relaxation nature of NBT-ST ceramics. So the energy storage performance could be modified. Specially, sample with 1 at.% CaO exhibits a high energy storage density of 1.51 J/cm 3 . Any further details can be found within this study.
研究领域:
材料科学
·
物理学
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DOI
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·Vol. 65
·期 30
·15885-15893
·
IF 3.9
Yang Binghan,An Wenjie,Zhang Yichun,Lu Quanfang,Yu Jie
Viscosity
index improvers (VIIs) are indispensable polymer additives
in modern lubricating oil formulations. In this work, a one-pot in situ free-radical polymerization strategy is proposed
for the synthesis of poly(lauryl methacrylate-methyl methacrylate-styrene)
(P(LMA-MMA-ST)) terpolymer VII in base oil, eliminating solvent removal
and complex post-treatment steps. The results showed that the maximum
thermal decomposition temperature, glass transition temperature, particle
size, and dispersity of terpolymers are 346 ° C, −33.64
° C, 16 nm, and 2.17, respectively, confirming that the copolymer
has a uniform molecular structure and adequate thermal stability.
The terpolymer exhibits favorable rheological properties in base oil.
At a content of 7.5 wt %, the viscosity index reaches 225 with a pour
point of −29 ° C, and when increasing the content to 9.1
wt %, the viscosity index further improves to 244 without deterioration
of low-temperature performance. The tribological performance shows
that the maximum reduction of the friction coefficient is up to 14.89%.
Compared with other VIIs, the P(LMA-MMA-ST) delivers competitive efficiency.
All the results demonstrated that the base oil-mediated one-pot strategy
has industrialization potential and practical application in the synthesis
of poly(methacrylate)-type VIIs.
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高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2025
·
IF 2.4
Weimin Yan,Chengmin Hou
The composite particles (St/Fe3O4) were prepared using the co-precipitation method, whereby FeSO4 and FeCl3 were precipitated under alkaline conditions. The particles were composed of a starch matrix and Fe3O4. Subsequently, AA was grafted and cross-linked onto the composite particles (St/Fe3O4) via a one-step traditional free radical polymerization method, resulting in the formation of polymer-modified composite particles (St/Fe3O4-g-pAA). The initiator used in this process was 2,2’-Azobis(2-methylpropionitrile). The structures of St/Fe3O4 and St/Fe3O4-g-pAA were characterized by FTIR, thermogravimetric analysis and hysteresis loop. The impact of varying parameters, including the dosage of the St/Fe3O4 and St/Fe3O4-g-pAA adsorbents, the initial pH value of the Cu(II) solution, the initial Cu(II) concentration, the absorption time, and the temperature, on the adsorption behavior of Cu(II) was investigated. The results demonstrated that St/Fe3O4-g-pAA exhibited excellent adsorption performance for Cu(II), with a unit adsorption capacity of 123.92 mg/g and a maximum removal rate of 85% when the original concentration of the Cu(II) solution was 10. The experiment was conducted with 24 mg/L of Cu(II) at a pH of 7 at room temperature, with a mass of 1.5 mg of St/Fe3O4-g-pAA and an adsorption time of 3 h. The adsorption process followed the Langmuir model and the pseudo-second-order kinetic model, which was dominated by chemical adsorption and belonged to single-layer adsorption. The results of the renewable performance studies demonstrated that following eight cycles of adsorption, 92% of the initial adsorption effect was retained. It can therefore be concluded that the St/Fe3O4-g-pAA adsorbent material prepared in this work is an effective means of improving the adsorption rate of Cu(II).
研究领域:
环境科学
·
材料科学
·
化学工程
·
高分子科学
·
水处理技术
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产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 29
·21107-21117
·
IF 3.9
Yang Bai,Jianing He,Jinsheng Sun,Ren Wang,Ruifang Wang
To treat the issue of increased resource wastage due to the higher plugging tendencies of oil-based drilling fluids (OBDF) relative to water-based drilling fluids, this study synthesized a ternary composite oil-absorbing resin and optimized its synthesis parameters. The influence of temperature variations on the resin's oil absorption capacity was assessed. Techniques such as infrared spectroscopy, scanning electron microscopy, TGA-DSC measurements, crosslinking degree analysis, contact angle analysis, X-ray photoelectron spectrometry analysis and examination of the resin's plugging mechanism were employed to investigate its molecular structure, oil absorption properties, and plugging efficiency. Additionally, the impact of various synthesis conditions on the oil absorption expansion rate of the oil-absorbing resin was examined. The findings indicate that the resin developed in this research maintains robust oil absorption capabilities at 160 °C, exhibiting an oil absorption expansion rate of 12.5 g g−1. At this temperature, the composite resin particles effectively sealed leaks of widths 0.25, 0.5, and 0.75 μm. Comparative analysis revealed that adding 3% of these resin particles to OBDF significantly enhanced the sealing of fractures. Remarkably, at 160 °C, OBDF amended with resin particles managed to completely seal fractures measuring 0.25 μm. The novelty of this study is attributed to the utilization of styrene for enhancing the resin's rigidity, coupled with the application of octadecyl methacrylate, which contains long-chain alkyl groups, to optimize the oil absorption and expansion characteristics of the oil-absorbing resin.
研究领域:
材料科学
·
石油工程
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产品关联
DOI
PubMed
高影响因子
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