NANO LETTERS
·
2025
·
IF 9.1
Hongyu Qin,Xiaoyang Chen,Fei Gao,Qifan Liu,Haiming Lv,Yan Huang
Conductive polymer-based electrochromic materials (ECMs), distinguished by their wide color tunability and low cost, are limited particularly in terms of their optical modulation range and response time; meanwhile, their monomers pose significant risks to human health and the environment. In this work, we report a nontoxic polyaniline (PANI)-based derivative, poly(N-phenylglycine) (PNPG). By introducing carboxyl groups onto the nitrogen atoms of the polymer backbone, the conjugated and electronic structure of the polymer was modified, thus reducing the bandgap of PNPG and facilitating charge transportation. Therefore, PNPG demonstrates a remarkable optical modulation amplitude (85% at 778 nm) and a broad color gamut (CIE chromaticity coordinate ranges: x, 0.26–0.4; y, 0.29–0.47). Furthermore, PNPG is successfully integrated into both rigid and flexible electrochromic devices. This work offers a solution for the development of high-performance, nontoxic conductive polymers, highlighting the potential for advanced applications in smart electronics.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 29
·13985-13992
·
IF 3.3
Luo Xu,Fang Yang,Jiagen Li,Qihui Wang,Lin Du,Min Yang,Xiaohong Fu
In this work, an electrochemical sensor based on a highly efficient competitive method is proposed that uses SiO2-PNPG as an adsorbent for the efficient detection of Pb(II) in soil. The silica (SiO2) and N-phenylglycine (NPG) polymer (SiO2-PNPG), synthesized using a one-pot polymer method, was applied to construct specific metal electrochemical sensors with high sensitivity. The high sensitivity and good selectivity were accomplished in the determination of Pb(II) due to the selective penetration and accumulative effect of SiO2-PNPG. The correlation between the current response and the Pb(II) concentration presents a linear range from 2.12 to 15.78 μg mL−1 with a detection limit of 0.166 μg mL−1 (S/N = 3, R2 = 0.9987). The sensitivity, reproducibility and stability of this sensor are promoted due to the facilitated electron transfer.
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Journal of Food Measurement and Characterization
·
2023
·Vol. 17
·期 6
·6363-6369
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IF 3.4
Tang Man,Guo Junying,Shen Zhen
The presence of pesticide residues in agricultural products, such as tea, poses significant health risks to consumers and has become a major concern for the food industry. Carbendazim, a widely used fungicide, has been identified as one of the harmful contaminants in tea. Rapid and accurate detection of carbendazim residues is therefore essential for ensuring food safety and quality. In this study, we propose a novel machine learning-assisted electrochemical sensor based on a CuO/reduced graphene oxide (rGO)/poly N-phenylglycine (NPAN) composite electrode for the rapid detection of carbendazim residues in tea. The CuO/rGO/NPAN electrode offers enhanced selectivity and sensitivity, enabling reliable detection of carbendazim even in the presence of other pesticides. By systematically evaluating various machine learning models and preprocessing techniques, we optimize the sensor’s performance and achieve accurate classification and identification of carbendazim residues. Our research contributes to the field of food safety assessment by introducing a novel electrode design and demonstrating the effectiveness of machine learning-assisted electrochemical sensors for the detection of carbendazim residues in tea.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2021
·
IF 3.205
Lei Feng,Xianyu Liang,Xuejin Mao,Hao Wan,Yan Wu,Quanbin Han
N-phenylglycine (NPG) in human urine could be an important biomarker for predicting cancers, but its detection has difficulty due to its low abundance in urine. Herein, we report a molecular imprinted polymer (MIP) method to efficiently recognize NPG in urine. The MIP was prepared by precipitation polymerization, adopting NPG as the template, acrylamide (AM) as functional monomer, trimethylpropane triacrylate (TRIM) as crosslinking agent, and acetonitrile as porogen. The specificity and selectivity of MIP towards NPG in human urine were determined by comparing MIP's adsorption to the NPG and N-crotonylglycine (NTG) under the same conditions. The result β = Q MIP-NPG / Q MIP-NTG = 4.7 indicated the satisfactory specificity and selectivity. Parameters affecting the extraction efficiency were further optimized. Under the optimum conditions, the linear range, limit of detection, and limit of quantification of NPG were 0.5–100 mg∙L −1 , 1.6 × 10 −2 mg∙L −1 , and 5.5 × 10 −2 mg∙L −1 , respectively. Recoveries of NPG in human urine were in the range of 84.7–100.0% with RSD S of 3.8–10.8%. The developed method demonstrated superior selectivity to the target analyte, which can be applied to separate and enrich the NPG from urine samples.
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PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Kexin Liu,You Wu,Yanni Xi,Zhanxiong Li
A desired synthetic route of N -phenyl anhydride was proposed, and it was used as a monomer raw material. Poly(amino acid) chains were formed via in situ ring-opening polymerization of the acid anhydride, initiated by the self-assembled amine monomolecular film, and were subsequently grafted on the surface of cotton fibers to create a rough morphology and obtain a low-surface-energy surface. The effects of various experimental conditions on the rough surface structure with microspherical morphology were then studied. Moreover, the morphology of the grafted polymer on the fiber surface was observed by scanning electron and atomic force microscopy , substantiating the correlation analysis of the growth process and formation mechanism of the poly(amino acid) microspheres . On this basis, the poly(amino acid)–cotton fabric surface was modified with octyl isocyanate, which endowed the fabric with lower surface energy and superhydrophobicity. Notably, the water contact angle of the fabric reached 158.2 ± 0.8°. Self-cleaning and oil–water separation tests showed that the prepared superhydrophobic cotton fabrics displayed superior stain resistance and oil–water mixture separation performances. The prepared fabrics are highly rated for physicochemical stability and unaffected wearability, and are expected to broaden the application range of cotton fabrics.
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Biomaterials Science
·
2019
·Vol. 7
·期 4
·1705-1715
·
IF 5.251
Chanjuan Liu,Changping Ruan,Rui Shi,Bang-Ping Jiang,Shichen Ji,Xing-Can Shen
Indocyanine green (ICG), a multifunctional near-infrared (NIR) imaging agent approved by the FDA, has been extensively used in clinical cancer theranosis, but limited by its inherent instability, short plasma half-life and lack of targeting ability. Herein, an in situ formed photothermal network based thermosensitive hydrogel (PNT-gel) constructed by using supramolecular cross-linking conjugated polymers was developed for the stabilization of ICG and efficient combinatorial photothermal/photodynamic antitumor therapy. While the conjugated polymeric backbone in PNT-gel anchored the aromatic phototherapeutic agent ICG via π–π stacking interactions to avoid premature leakage, it also directly converted low-dose NIR light to induce localized hyperthermia to enhance the photothermal effect. The PNT-gel shows a reversible gel-to-sol upper critical solution temperature (UCST) that is slightly above body temperature. Therefore, the controlled release of ICG was switched on or off by NIR via photothermal-induced gel–sol transition. In vitro and in vivo antitumor experiments demonstrated that ICG loaded PNT-gel not only efficiently induced the killing of 4T1 cancer cells, but also achieved almost complete eradication of 4T1 cells by one-dose intratumoral injection in combinatorial photothermal/photodynamic therapy under irradiation of a low-dose 808 nm laser (0.14 W cm−2). Additionally, the combinational therapy proved to enhance the effectiveness of photodestruction without tumor recurrence compared with photothermal therapy (PTT) or photodynamic therapy (PDT) treatment alone.
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COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Mingli Ni,Guannan Chen,Yong Wang,Haiyan Peng,Yonggui Liao,Xiaolin Xie
Holographic polymer nanocomposites containing the liquid crystal (LC) have garnered a great deal of attention primarily because of their unique electric-switchable optical properties . Herein, three types of polyhedral oligomeric silsesquioxane (POSS) are doped into the holographic polymer nanocomposites to tune their ordered structure and electro-optical performance. These POSS dopants are methacryl POSS with eight reactive double bonds, methacrylisobutyl POSS with one reactive double bond, and aminopropylisobutyl POSS with nonreactive groups. Interestingly, methacryl POSS is primarily chemically bonded to the polymer network within the constructive regions, which deteriorates the diffraction efficiency and electro-optical performance due to the depressed ordered structures. In contrast, methacrylisobutyl POSS displays a negligible effect on the diffraction efficiency and electro-optical performance while significantly improving the thermostability of holographic polymer nanocomposites, although it is also chemically linked to the polymer network within the constructive regions. Distinctively, aminopropylisobutyl POSS mainly locates in the destructive regions and clearly improves the electro-optical performance and thermostability of holographic polymer nanocomposites.
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MACROMOLECULES
·
2015
·
IF 5.8
Mingli Ni,Haiyan Peng,Yonggui Liao,Zhifang Yang,Zhigang Xue,Xiaolin Xie
We synthesize zinc sulfide (ZnS) nanoparticles with a diameter of ∼5 nm and formulate novel photopolymer/ZnS nanocomposites for holographic recording. By taking advantage of the photoinitibitor, composed of 3,3′-carbonylbis(7-diethylaminocoumarin) (KCD) and N-phenylglycine (NPG), with a capability of spatiotemporally tailoring the grating formation process, we successfully achieve high performance holographic photopolymer/ZnS nanocomposites with as high as 93.6% of diffraction efficiency (η), 26.6 × 10–3 of refractive index modulation (n1), 8.4 per 200 μm of dynamic range, and 9.8 cm/mJ of photosensitivity. In addition, for an aim of roughly describing the grating formation process, we establish a novel exponential correlation between the ZnS nanoparticles segregation degree (SD) and the ratio of photopolymerization gelation time (tgel) to holographic mixture viscosity (v). Finally, we reconstruct and display 3D images that are clearly identifiable to the naked eye through a master technique, opening a versatile class of potential applications in high capacity data storage, stereoadvertisements, and anticounterfeiting.
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Polymer Chemistry
·
2015
·Vol. 6
·期 48
·8259-8269
·
IF 5.52
Haiyan Peng,Guannan Chen,Mingli Ni,Yan Yan,Jiaqing Zhuang,V. A. L. Roy,Robert K. Y. Li,Xiaolin Xie
Holographic polymer dispersed liquid crystals (H-PDLCs) pertain to one type of intriguing switchable electro-optical device, and there is a constant need to quantitatively understand the photopolymerization kinetics and gelation process during the formation of H-PDLCs for the purpose of improving the diffraction efficiency and driving voltage. Herein, we quantitatively investigate the effect of the photoinitibitor composed of 3,3′-carbonylbis(7-diethylaminocoumarin) (KCD) and N-phenylglycine (NPG), with initiation and inhibition functions simultaneously generated under monochromatic illumination, on the formation of H-PDLCs. The outcomes reveal that an augmentation of KCD loading from 0.3 × 10−3 to 1.4 × 10−3 mol L−1 dramatically promotes the photopolymerization rate and monomer conversion. Reversely, a further increase in KCD content drastically depresses photopolymerization. The numerical deduction shows that the kinetics complies with the classical photopolymerization kinetics characteristics in the full range of the KCD content. Counterintuitively, the gelation time almost keeps constant when the KCD content is less than 1.8 × 10−3 mol L−1, and then is able to grow by more than 4 times when the KCD loading further increases. Ketyl radical inhibition, which subsequently results in shortened weight-average chain lengths and increased gel point conversions, is believed to account for the kinetics and exceptional gelation behaviors. H-PDLCs with a scaffolding morphology are formed, and with an augmentation of the KCD content, the segregation degree and diffraction efficiency significantly improve from zero to 64% and 78 ± 11%, respectively, and then level off, allowing for the facile fabrication of glass-free colored 3D images; while the critical driving voltage gradually decreases from 8.9 ± 1.0 to 4.6 ± 0.7 V μm−1.
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Nanophotonics
·
2017
·Vol. 7
·期 2
·473-478
·
IF 4.492
Lihua Ye,Fangjie Li,Changgui Lu,Zhixiang Cheng,Guohua Hu,Yanqing Lu,Yiping Cui
The random laser from sheared dye-doped polymer-dispersed liquid crystal (DDPDLC) is investigated. As the emission intensity weakens, the threshold of random laser from DDPDLC increases from 2.0 mJ/pulse to 4.0 mJ/pulse, and the degree of polarization (DOP) increases from 0.1 to 0.78, obviously when the shear distance increases from 0 mm to 4 mm. As the liquid crystal droplets are gradually oriented in the shear direction caused by alignment direction of polymer chain and anisotropy of droplet shape, the scattering intensity perpendicular to the shear direction gradually decreases and that parallel to the shear direction gradually increases. The anisotropic absorption of the laser dye also plays a certain role as the shear distance is 0 mm. The controllable intensity and polarization degree of random laser have a huge potential for sensing applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chenxuan Xie,Mingzhe Li,Ziyu Ling,Xiaofen Wang,Yuzhen Lv,Kepi Chen
Highly efficient and stable electrocatalysts toward hydrogen evolution reaction (HER) under large current density are essential for alkaline water splitting. Herein, an active and durable CoMoO 4 -based HER electrocatalyst is developed, with a coupling of surface phosphorization and polypyrrole (PPy) modification to accelerate water dissociation and prevent alkaline corrosion during HER process, ensuring great catalyst stability. The prepared PPy-CoMoO 4 /P@NF catalyst achieves perfect HER activity with only 242.1 mV overpotential at the industrial current density of 1000 mA·cm −2 in 1.0 M KOH as well as a low Tafel slope of 39.0 mV dec −1 . Moreover, PPy modification greatly inhibits the alkaline corrosion and the catalyst exhibits stable operation for 100 h at 1000 mA·cm −2 with a conservation rate of 98.5 %. Electrochemical tests and theoretical calculations reveal that the multiple interfaces formed by CoMoO 4 /CoP/PPy significantly reduce the energy barrier of hydrolysis and improve the interfacial adsorption of H ads . Meanwhile, the surface phosphating changes the Gibbs free energy of rate-determining step (RDS) from −0.54 to −0.29 eV, optimizing the energy barriers for hydrogen adsorption-desorption. Remarkably, an electrolyzer with PPy-CoMoO 4 /P @NF as cathode catalyst only needs a cell voltage of 1.92 V at 1000 mA cm −2 for overall water splitting. This study provides an effective way to develop highly efficient and stable HER catalysts toward industrial water splitting.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Guannan Chen,Mingli Ni,Haiyan Peng,Feihong Huang,Yonggui Liao,Mingkui Wang,Jintao Zhu,V. A. L. Roy,Xiaolin Xie
Holographic photopolymer composites have garnered a great deal of interest in recent decades, not only because of their advantageous light sensitivity but also due to their attractive capabilities of realizing high capacity three-dimensional (3D) data storage that is long-term stable within two-dimensional (2D) thin films. For achieving high performance holographic photopolymer composites, it is of critical importance to implement precisely spatiotemporal control over the photopolymerization kinetics and gelation during holographic recording. Though a monochromatic blue light photoinitibitor has been demonstrated to be useful for improving the holographic performance, it is impractical to be employed for constructing holograms under green light due to the severe restriction of the First Law of Photochemistry, while holography under green light is highly desirable considering the relatively low cost of laser source and high tolerance to ambient vibration for image reconstruction. Herein, we disclose the concurrent photoinitiation and inhibition functions of the rose bengal (RB)/N-phenylglycine (NPG) system upon green light illumination, which result in significant enhancement of the diffraction efficiency of holographic polymer-dispersed liquid crystal (HPDLC) gratings from zero up to 87.6 ± 1.3%, with an augmentation of the RB concentration from 0.06 × 10–3 to 9.41 × 10–3 mol L–1. Interestingly, no detectable variation of the ϕ1/2kp/kt1/2, which reflects the initiation efficiency and kinetic constants, is given when increasing the RB concentration. The radical inhibition by RBH• is believed to account for the greatly improved phase separation and enhanced diffraction efficiency, through shortening the weight-average polymer chain length and subsequently delaying the photopolymerization gelation. The reconstructed colored 3D images that are easily identifiable to the naked eye under white light demonstrate great potential to be applied for advanced anticounterfeiting.
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