JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Lina Guo,Xiaochao Chen,Ruijun Xie,Limin Han,Ning Zhu
4-Phenyl-2-(2′-pyridyl) quinoline ( L1 ) was synthesized by a three-component reaction of aniline, phenylacetylene and pyridine-2-aldehyde catalyzed by trifluoromethanesulfonic acid (TfOH). Its structure was confirmed by FT-IR, MS, NMR and X-ray single crystal diffraction analysis. L1 was investigated as a probe for the detection of Fe 3+ and Fe 2+ ions, which displayed fluorescence enhancement by Fe 3+ and fluorescence quenching by Fe 2+ . This unique fluorescence switching property of L1 was used to identify Fe 2+ and Fe 3+ with high selectivity and sensitivity. The detection limit of Fe 2+ was 8.772 × 10 −9 mol/L and that of Fe 3+ was 1.912 × 10 −9 mol/L. Mechanism investigation revealed that the fluorescence quenching of probe L1 was caused by ferrous-induced PET process and the fluorescence enhancement was due to the combinational effect of ferric-induced PCT enhancement and PET inhibition. In addition, the cyclic voltammetry curves demonstrated that both the Fe 2+ complexes and the Fe 3+ complexes displayed reversible redox process, indicating that the Fe 2+ and Fe 3+ complexes can be reversibly converted into each other upon electrical stimulation. The reversible “On” and “Off” of the fluorescence emission of iron complexes upon electrochemical stimulation could potentially be used in information recording and erasing.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhenming Wang,Lanxiu Ni,Xiaobo Zhang,Liang Feng
To alleviate the lack of sensors on the Internet of Things (IoT), a novel flexible substrate-free sensing membrane has been put forward, of which the fabrication is simple, low-cost and has potential of large-scale production via a vacuum filtration method. After alkaline hydrolysis , paper fibers were covered with reduced graphene oxide (rGO) and further functionalized with a layer of polyaniline (PANI) by in-situ polymerization. The rGO functionalized fiber (GF) played a competent role as the embedded conductive network, efficiently transferring the charge signal from the surface sensing layer. Eventually, the functionalized fibers were re-filmed under a 0.1 MPa negative pressure by vacuum filtration method. The surface area of the film was about 23.76 cm 2 and 1 × 1 cm 2 square was cut for the following test. The sensing membrane based on PANI covered rGO functionalized fiber (PGF) has shown superb sensing performance to NH 3 , with excellent stability, selectivity and sensitivity at room temperature . The linear response range of sensor based on PGF was 25 ppm, the correlation coefficient was 0.9908 and the limit of detection (LOD) was 34 ppb. The response to NH 3 was ∼14% while the responses of other testified interfering gases were all below 0.5%. Most importantly, the sensing membrane has exhibited an excellent capability of resisting bending, and maintained the response to 10 ppm NH 3 (13.55–14.3%) even after 1200 bends, indicating that the sensor has a bright prospect of future wearable applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 58
·期 1
·170-185
·
IF 4.682
Zang Yu,Gao Shan,Jing Boyu,Sun Hong,Wang Jianjun,Liu Jiao,Miao Fengjuan,Xu Liang
Four kinds of conjugated microporous polymers (CMPs) with imine structures were synthesized by a Sonogashira coupling reaction followed by a postreaction between aldehydes and amines. Palladium nanoparticles (Pd NPs) were successfully supported on the CMPs to prepare Pd/CMP heterogeneous catalysts and were used to catalyze the Suzuki–Miyaura coupling reaction. The number of aromatic nuclei and nitrogen atoms in the CMPs highly affects Pd loading. In the Suzuki–Miyaura coupling reaction, the Pd/CMP with good Pd NPs dispersibility and appropriate Pd content (Pd/CMP-NA) exhibited the highest catalytic efficiency with 100% conversion and 95.4% yield which can be used for many substrates. The Pd/CMP-NA heterogeneous catalyst was easy to recover and still exhibited good catalytic efficiency after 5 cycles. To further understand the catalytic mechanism of Pd/CMP-NA on the Suzuki–Miyaura coupling reaction, we proposed a rational catalytic cycle. This paper provides an idea for the structural design of CMPs used for Suzuki–Miyaura catalytic reaction.
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Ting Qin,Xiaohui Gao,Pin Zhang,Longlong Qin,Chen Li,Haipeng Xie,Shengxiang Huang,Congwei Liao,Lianwen Deng
The electrochromic (EC) process is essentially an electrochemical reaction associated with the intercalation (de-intercalation) of ions to (from) the EC film. To improve the infrared emissivity modulation performances of the infrared electrochromic devices (IR-ECDs), polyaniline/carbon quantum dots (PANI/CDs) flexible films were fabricated by the electropolymerized approach in this paper. The prepared PANI/CDs porous films were exhibited and verified excellent electrochromic properties through micromorphology analysis and electrochemical tests. The measured emittance variation (Δ ε ) of the prepared PANI/CDs samples are 0.41, 0.46, and 0.42 in ranges of wavelength 3–5 μm, 8–14 μm, and 2.5–25 μm, respectively. In addition, for the infrared range of 2.5–25 μm, the radiation energy can be continuously modulated from 80.77 to 241.98 W/m 2 (ΔP = 161.21 W/m 2 ). The assembled IR-ECD based on PANI/CDs films obtains excellent IR modulation ability, that the emittance variations are 0.39, 0.41, and 0.37 in the wavelength ranges of 3–5 μm, 8–14 μm, and 2.5–25 μm, respectively. The switching times of the device for the coloration and bleaching are 3.1 s and 3.7 s respectively, much shorter than that of previously reported ECDs based on PANI. Meanwhile, the developed ECD presents decent durability, as the Δε values of IR-ECD in wavelength ranges of 3–5 μm, 8–14 μm, and 2.5–25 μm maintaining radio of 75%, 76%, and 68%, and current maintaining ratio of the device is above 90% after aging measurements of consecutive 100 cycles. Furthermore, the integrated IR-ECD was proposed to achieve dynamic conversion from golden yellow to dark green in the visible light regime through precise tuning of external biasing voltage. The proposed ECD based on PANI/CDs technology is promising for the future of adaptive IR sensors and thermoregulation-related applications.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Yufeng Bai,Lili He,Peng Lv,Chunhua Ge,Haoran Xu,Xiangdong Zhang
A microwave absorbing composite material with good thermal conductivity has been prepared to solve the problem of electromagnetic wave pollution in high-power density electronic equipment without increasing the heat load of the equipment. Herein, we prepared the quaternary absorbing material hydroxylated boron nitride nanosheets (BN-o)/reduced graphene oxide (r-GO) @Fe 3 O 4 @polyaniline (PAn) (BCFA) and adjusted the content of PAn to enhance the impedance matching and modulate the microwave absorption effect. At a PAn content of 40 wt%, the absorber exhibits admirable microwave absorption performance, the lowest reflection loss (RLmin) of −54.72 dB and effective microwave absorption bandwidth (RL < −10 dB, EAB) of 3.12 GHz at a thickness and frequency of 3.5 mm and 7.2 GHz, respectively. The excellent microwave absorption is due to a suitable mechanism of dielectric and magnetic losses and the excellent impedance matching of the absorber. Moreover, the high thermal conductivity and phonon transport properties of the BN-o/r-GO van der Waals heterostructure give the composite thermal conductivity of 1.69 W(m·K) −1 when the BN-o/r-GO content is approximately 14 wt%. Therefore, BCFA has become a candidate material to solve the electromagnetic pollution problem of high-power density electronic equipment.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Lili Xu,Shuai Liu,Zepeng Zheng,Ling Yu,Kuiling Li,Jianbing Wang,Jun Wang
Nanofiltration (NF) membrane with extraordinary acid stability and controllable separation performance is crucial for acidic wastewater treatment. In this study, we reported polyaniline (PANI)-based acid resistant membranes which can realize controllable ion transport under applied potential. To achieve this, electrically conductive membranes (ECMs) were fabricated by incorporating carboxylic multi-walled carbon nanotubes (MWNTs-COOH) and acids doped PANI via in-situ chemical polymerization. The external voltage was applied to manipulate the electrostatic interactions of ECMs with charged ions in order to regulate the ion transport. The results showed that the type of acid dopants (from small acid to polymer acid) affected the physicochemical and electrochemical properties of ECMs, and therefore influenced the ion rejection performance. ECM-PANI PSSA possessed the optimal acid stability performance among the three kinds of ECMs. It was interesting to find that all the ECMs showed elevated ion rejection rate in response to electrical voltage even immersed in the acid solution for different periods. The ion transport behavior in response to applied potential attributed to the interaction of steric hindrance, Donnan effect and dielectric effect. The proposed ion transport mechanism implied that the interaction energy barrier between ions and ECMs showed a significant change as a result of applied potential. For negatively charged membrane, the Donnan potential difference became more obvious under negative voltage, which made ion transfer more difficult. By contrast, negative voltage neutralized part of the positively charged surface, and therefore weakened the electrostatic interaction for positively charged membrane. The ECMs exhibit good ion rejection and membrane permeance by applying electrical voltage, whose performance was comparable to the current acid resistant NF membrane. This work offers a feasible guideline for the development of acid resistant membranes and opens opportunities in controllable ion transport for acidic wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2022
·
IF 6.978
Hou Liu,Yubin Feng,Songtian Che,Lin Guan,Xinting Yang,Yue Zhao,Linan Fang,Andrei V. Zvyagin,Quan Lin
Spinal cord injury (SCI) generally leads to long-term functional deficits and is difficult to repair spontaneously. Many biological scaffold materials and stem cell treatment strategies have been explored, but very little research focused on the method of combining exogenous neural stem cells (NSCs) with a biodegradable conductive hydrogel scaffold. Here, a NSC loaded conductive hydrogel scaffold (named ICH/NSCs) was assembled by amino-modified gelatin (NH2-Gelatin) and aniline tetramer grafted oxidized hyaluronic acid (AT-OHA). Desirably, the well-conducting ICH/NSCs can be simply injected into the target site of SCI for establishing a good electrical signal pathway of cells, and the proper degradation cycle facilitates new nerve growth. In vitro experiments indicated that the inherent electroactive microenvironment of the hydrogel could better manipulate the differentiation of NSCs into neurons and inhibit the formation of glial cells and scars. Collectively, the ICH/NSC scaffold has successfully stimulated the recovery of SCI and may provide a promising treatment strategy for SCI repair.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Coatings Technology and Research
·
2022
·Vol. 20
·期 3
·869-881
·
IF 2.339
Li Xianwen,Xu Xinmeng,Zhang Faai
Hydroxyl acrylate emulsion was prepared firstly by the semicontinuous seeded emulsion polymerization, and then adding polyaniline (PANI)/Cu/ZrO 2 ternary nanocomposites, two-component waterborne polyurethane (2 K WPU) composite coatings with antistatic and antibacterial properties were obtained by mixing the emulsion with hydrophilic modified polyisocyanate. The structure and morphology of the PANI/Cu/ZrO 2 were observed by Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray diffractometer. The thermal, antistatic, antibacterial, anticorrosion, and mechanical properties of the 2 K WPU composite coatings were determined. The results showed that the addition of the ternary nanocomposites increased the antistatic, antibacterial, anticorrosion, and mechanical properties of the 2 K WPU coating. The initial decomposition temperature increased from 200 to 225°C, and the tensile strength increased by 44.4%. The coatings still maintained good impact strength of 50/50 kg cm, adhesion of grade 2, flexibility of 1 mm, pendulum hardness of 293 s, and the gloss (60°) of 119.4.
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2023
·Vol. 224
·期 6
·2200365
·
IF 2.5
Yifei Gao,Jinyu Sun,Xiaohui Tian,Yizhong Yuan
Flexible strain sensors are one of the core devices in wearable electronics. At present, it is still difficult to develop flexible strain sensors with high stretchability, sensitivity, and long-term stability. In this study, polyaniline (PANI) is successfully coated onto the surface of epoxidized natural rubber (ENR) nanospheres to form the PANI@ENR composites with core–shell structure by in situ polymerization. At PANI content of 5 wt% (PANI/ENR), the optimally conductive networks of PANI endow the composites with excellent comprehensive properties. The strain-sensing tests show that the PANI@ENR composites possess two successive linear sensing ranges (gauge factor of 7.3 in 0–400% strain, gauge factor of 1.8 in 400–1000% strain) and excellent cycling stability (over 2500 cycles at 0–50% strain). In addition, PANI@ENR-based strain sensors can monitor the movements of human finger joints, elbow joints, and knee joints in real time, indicating a wide range of potential applications in wearable flexible electronics.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yuhang Shen,Li Zheng
Polyaniline-poly (methylene blue) nano-rod composite has been prepared by a chemical oxidative polymerization method. The PANI-PMB composite was characterized by scanning electron microscopy, spectrophotometry, Fourier transforms infrared spectrometry, and X-ray diffraction. The electrochemical performance of the PANI-PMB composite was studied by electrochemical impedance spectroscopy, cyclic voltammetry, and differential pulse voltammetry. The prepared nanocomposite was applied for the electrochemical sensing of ascorbic acid. The results show that the PANI-PMB modified carbon paste electrode (PANI-PMB/CPE) had better catalytic activity to the electrochemical oxidation of ascorbic acid compared with PANI/CPE, PMB/CPE and CPE, which was due to the fast electron transfer efficiency of the PANI-PMB composite. Under the optimized experimental conditions, the differential pulse voltammetric peak current was linear with the ascorbic acid concentration in the range from 4 to 110 μM with a detection limit of 1.3 μM. Furthermore, the proposed method has been applied for the determination of ascorbic acid content in vitamin C tablets.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 3
·2024-2035
·
IF 3.9
Jiale Wu,Liguo Wang,Shuang Xu,Yan Cao,Ziqiang Han,Huiquan Li
Developing efficient and green catalytic systems is highly desired in the syntheses of alicyclic amines via hydrogenation of nitroaromatics. Herein, we developed Ru–Pd dual active site catalysts in which Ru and Pd species were anchored and highly dispersed on air-exfoliated carbon nitride (Ru–Pd/C3N4-air). As-prepared catalysts were employed in the hydrogenation of nitrobenzene (NB) to cyclohexylamine (CHA). Compared with single Ru or Pd based catalysts, Ru–Pd dual active site catalysts obtained a higher CHA production rate of 26.7 mol CHA mol−1 Ru·Pd h−1 at 80 °C and 3 MPa H2. The activation energy for the hydrogenation of the nitro group and benzene ring was calculated as 26.26 kJ mol−1 and 66.30 kJ mol−1, respectively. Intrinsic kinetic studies demonstrated that Pd was the dominant metal for hydrogenation of nitro group, while Ru was dominant for benzene ring. Thereinto, the corresponding non-dominant metals enhanced activation and dissociation of H2, thereby improving catalytic activity significantly. This excellent performance of Ru–Pd catalysts could be attributed to highly dispersed Ru–Nx and Pd–Nx at a nanoscale distance, which was conducive to metal-assisted hydrogenation. Stability investigation showed that the performance of Ru–Pd catalysts could be essentially maintained at a high level. Additionally, the substrate scope could be successfully extended to hydrogenation of other nitroaromatics with different substituents.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Mingxia Sun,Juanjuan Feng,Yang Feng,Xubo Xin,Yali Ding,Min Sun
The efficient sample pretreatment and high-performance chromatographic separation are essential for an accurate analysis of the complex sample. Finding a material that can apply as both sorbent for sample preparation and stationary phase for chromatography is greatly important for analytical chemistry. With a large number of active sites and designable properties, the dendrimers displayed potential performance for sample preparation and chromatographic separation. In order to improve its selectivity restricted by the limited type of functional groups (amide, ethylidene, amino groups), ionic liquid (1,1′-(1,4-butyricdiyl)bis(1-aminopropyl imidazolium)dibromide) were introduced to functionalize dendrimers. With porous silica as the base, ionic liquid-functionalized dendrimer grafted silica (SiO 2 @G1.5-IL) was obtained and characterized by X-ray photoelectron spectroscopy, elemental analyzer, as well as specific surface and porosity analyzer. The material was used as stationary phase for mixed-mode chromatography and sorbent for SPE, respectively. Under reversed-phase liquid chromatography (RPLC), it successfully separated some hydrophobic analytes (five polycyclic aromatic hydrocarbons (PAHs), two bisphenols, diphenylpropane, and diphenylmethane), by utilizing hydrophobic, π-stacking and hydrogen bonding interactions. Based on the hydrophilic effect, it could separate hydrophilic analytes (nucleosides and alkaloids), which coincident with hydrophilic interaction liquid chromatography (HILIC). And it exhibited better separation capacity than NH 2 @SiO 2 and SiO 2 @G1.5 under the above two modes. Furthermore, the thermodynamic parameters (ΔH, ΔS, and ΔG) of the above types of analytes on the SiO 2 @G1.5-IL column were also investigated in detail, revealing the controlling factors during the chromatographic separation. And the relative standard deviations (RSDs, 0.03–2.95%, n = 10) of the repeatability of chromatographic separation were satisfactory. After that, SiO 2 @G1.5-IL-based SPE column was online combined with high-performance liquid chromatography to investigate the extraction selectivity for three types of hydrophobic organic pollutants (PAHs, estrogens, and bisphenols), and compared to SiO 2 and C18 columns. According to their extraction performance, PAHs were selected as the target analytes, and the online analytical method was established. The limits of detection were as low as 0.001 μg L -1 due to the high enrichment factor reach to 3869, limits of quantity were 0.003–0.17 μg L -1 , linear ranges were from 0.003 to 15.0 µg L -1 , the adsorption capacity was 16.10 μg g −1 , as well as RSDs were 0.5–3.7%, 0.6–6.7%, and 4.2–9.0% for intraday, interday tests and reproducibility. Finally, it was applied to analyze the environmental water samples (tap water, snow water, and rainwater), and satisfactory results were obtained (spiked recoveries were 86.8%-120.9%). Therefore, SiO 2 @G1.5-IL was a powerful material that can be used for the chromatographic separation of both hydrophobic and hydrophilic samples by RPLC or HILIC mode, as well as the efficient online extraction of hydrophobic targets prior to C18 column-based high-performance liquid chromatography.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）