Chemistry Africa-A Journal of the Tunisian Chemical Society
·
2021
·Vol. 5
·期 1
·79-87
·
IF 0
Naz Farah,Ciprian Matteo,Luo Zhixiong,Yan Shilin,Iqbal Shahzad Zafar,Zhu Meifang,Chaemchuen Somboon,Verpoort Francis
The synthesis and use of MOF-derived Co/NCF (N-doped carbon framework) material as a heterogeneous catalyst for copolymers synthesis via ring-opening polymerization (ROP) are reported for the first time. The Co/NCF material is applied for the copolymerization of L -lactides (LA) and ε-caprolactone (ε-CL) as monomers via ROP in bulk without any solvent or co-catalyst. The as-prepared catalyst is characterized using XRD, TPD, XPS, SEM, and TEM analytical techniques. At the same time, 1 H and 13 C-NMR spectroscopy were used to analyze the microstructure of the copolymer confirming the random copolymer structure. The average r values calculated from the heterodiad analysis of the 1 H NMR, data were r LA = 0.96 and r CL = 0.93 and L value calculated from the triads analysis of 13 C NMR, data were L LA = 3.17 and L CL = 2.79, respectively. It has been observed that the melting temperature and glass transition temperature of the copolymer increases with higher LA content. The XRD and DSC analyses also confirmed that the as-synthesized copolymer possesses two phases corresponding to the polylactide and polycaprolactone, respectively. Additionally, the activity of Co/NCF is also compared with other Co-based heterogeneous catalysts to demonstrate its ability. Graphic Abstract
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2017
·Vol. 43
·期 8
·4353-4368
·
IF 1.369
Yuan Hong,He Jie,Li Ruilan,Ma Xiaoqin
The solid acid catalysts SO 4
2− /TiO 2 were prepared by the impregnation technique under two preparation conditions which were different in calcination temperature and concentration of impregnation solution of H 2 SO 4 . The characterization was carried out by using Fourier transform infrared spectrometer (FTIR), X-ray diffraction (XRD), temperature programmed desorption of NH 3 (NH 3 -TPD), N 2 -BET, X-ray fluorescence and thermal gravity (TG)–differential scanning calorimetry (DSC). The characteristic peaks in the FTIR spectrum were essentially the same within the calcination temperature range of 400–600 °C. The XRD results indicated that the sample could show partial specific peaks of the anatase phase as the calcination temperature was higher than 400 °C. The obvious strong acid and superacid sites of the prepared SO 4
2− /TiO 2 were conformed by the NH 3 -TPD results. The BET surface areas of 102–206 m 2 /g were measured by the N 2 -BET method, and the pore size distributions were essentially mesoporous. The TG–DSC results showed that SO 4
2− /TiO 2 would decompose at about 500 °C in the air. The solid acid SO 4
2− /TiO 2 were used for the epoxidation of castor oil. The lowest iodine value of the product was 52.65/100 g when the reaction temperature was 65 °C, reaction time was 10 h and catalyst loading was 15 wt.%.
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Journal of the Iranian Chemical Society
·
2020
·Vol. 18
·期 1
·159-166
·
IF 1.552
Xu Wenjing,Ye Liuqing,Li Wei,Zhang Zhanying
MIL-101(Cr) morphology was modulated by addition of sodium stearate (SS) and cetyltrimethylammonium bromide (CTAB) in the precursor solution. The resulting SS modulation MIL-101(Cr) (SS@MIL-0.1 and SS@MIL-0.2) are quasi-spherical, and the CTAB modulation MIL-101(Cr) (CTAB@MIL-0.2) has a regular octahedral shape, similar to the pure MIL-101(Cr). Their particles after modification are reduced, and the structures of MIL-101(Cr) crystals are not destroyed. These modifications improve their adsorption capacity for methyl orange (MO). The maximum adsorption capacity of MO on the CTAB@MIL-0.2 and SS@MIL-0.2 can reach 645.2 and 454.5 mg g −1 , respectively, superior to many adsorbents reported in the literatures. The CTAB@MIL-0.2 and SS@MIL-0.2 exhibit outstanding selective adsorption of MO from the mixed solution of MO and methylene blue (MB). Our work may provide a feasible method to obtain MIL-101(Cr) with different morphologies, especially quasi-spherical, and open up a new doorway for utilizing MIL-101(Cr).
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2014
·Vol. 30
·期 5
·863-867
·
IF 1.119
Wang Huan,Yao Yuan,Han Lu,Che Shun’ai
Self-assembled triblock terpolymers have attracted intense attention in recent years because of their abundant variety of assembly mesostructure. We reported the synthesis of mesoporous silica materials with the amphiphilic ABC triblock terpolymer polyethylene-poly(ethylene oxide)-polycaprolactone(PE-PEO-PCL) as a template and tetraethoxysilane(TEOS) as a silica source. Increasing the hydrophilic head group(PEO) led to the decrease of packing parameter g , which gave rise to the mesophase transformation from a cylindrical two-dimensional hexagonal P 6 mm structure to a cage-type face centered cubic closed-packing mesostructure. This new templating route provided a new insight into the template factor governed inorganic-organic self-assembly mesophases.
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ENVIRONMENTAL MONITORING AND ASSESSMENT
·
2020
·Vol. 192
·期 6
·1-9
·
IF 1.903
Li Xuguang,Elgarhy Abdelbaky Hossam,Hassan Mohamed Elfatih,Chen Yanbo,Liu Guanglong,ElKorashey Reham
Existing research on phosphorus removal from wastewater mostly focused on inorganic phosphorus while ignoring organic phosphorus, which has potential bioavailability. This study aims to provide an innovation for the development of advanced treatment material for both inorganic and organic phosphorus removal in water. In this study, ferrihydrite loaded on the graphene oxide (FeOOH-GO) composite adsorbent was synthesized by surface precipitation method, and its ability to remove both phosphate and diazinon as forms of inorganic and organic phosphorous from water was investigated. Characterization of the loaded composite using X-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier transform-infrared spectroscopy (FTIR) indicated that FeOOH was successfully loaded onto graphene. The results of batch adsorption experiments showed that the adsorbent could remove both inorganic and organic phosphorus compounds simultaneously from water. When FeOOH content is 40%, the equilibrium adsorption amount of FeOOH-GO composite adsorbent for phosphate and diazinon was 5.81 and 23.20 mg g −1 , respectively. Environmental parameters such as pH and initial concentration have important influence on phosphorus removal by FeOOH-GO composite adsorbent and the removal efficiency of the inorganic and organic phosphorus from water decreases by increasing the initial concentration of phosphate and diazinon and the pH. It was concluded that the FeOOH-GO composite adsorbent has great potential to remove both inorganic and organic phosphate simultaneously from contaminated water.
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PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2014
·Vol. 71
·期 2
·267-275
·
IF 1.547
Zhang Jing,Lan Pinjun,Li Jia,Xu Hua,Wang Qin,Zhang Xianpeng,Zheng Liren,Lu Yuehui,Dai Ning,Song Weijie
This paper reports a facile means to gradually tailor refractive index from an ultra-low- n of 1.10–1.45 based on hollow silica nanospheres hybridized with acid-catalyzed silica. The influences of the hybridization on refractive index, thin-film uniformity, and roughness were systematically investigated. The single-layered antireflection (AR) coatings and the three-layered AR coatings were prepared using the hybridized thin films as building blocks. The former showed the near-perfect transmittance and reflectance, 99.16 and 0.42 %, respectively, at a single wavelength of 600 nm, while the average transmittance ( T
ave ) and reflectance ( R
ave ) from the near ultraviolet (UV) to the visible region (300–800 nm) were moderate; the latter demonstrated an excellent AR capability in broadband that T
ave reaches 97.29 %, much higher than that of the single-layered AR coating, 95.86 %. More interestingly, the three-layered AR coating showed an average transmittance of 97.94 % in the near-UV wavelength range from 345 to 400 nm and it was 6.77 % higher than that of bare glass. Moreover, the three-layered AR coatings had the less degradation in transmission and surface morphology after the highly-accelerated temperature and humidity stress tests, and the wet abrasion scrub tests. The findings imply that both good optical performance and durability are likely to be achieved using the sol–gel derived multilayered AR coatings.
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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-8
·
IF 3.998
Chang Chao,Wang Zongyu,Fu Benwei,Ji Yulong
Solar energy as an abundant renewable resource has been investigated for many years. Solar thermoelectric conversion technology, which converts solar energy into thermal energy and then into electricity, has been developed and implemented in many important fields. The operation of solar–thermal–electric conversion systems, however, is strongly affected by the intermittency of solar radiation, which requires installation of thermal storage subsystems. In this work, we demonstrated a new solar–thermal–electric conversion system that consists of a thermoelectric converter and a rapidly charging thermal storage subsystem. A magnetic-responsive solar–thermal mesh was used as the movable charging source to convert incident concentrated sunlight into high-temperature heat, which can induce solid-to-liquid phase transition of molten salts. Driven by the external magnetic field, the solar–thermal mesh can move together with the receding solid–liquid interface thus rapidly storing the harvested solar–thermal energy within the molten salts. By connecting with a thermoelectric generator, the harvested solar–thermal energy can be further converted into electricity with a solar–thermal–electric energy conversion efficiency up to 2.56%, and the converted electrical energy can simultaneously light up more than 40 orange-colored LEDs. In addition to stable operation under sunlight, the charged thermal storage subsystem can release the stored heat and thus enables the solar–thermal–electric system to continuously generate electricity after removal of solar illumination.
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PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-14
·
IF 14.7
Xue Fangchao,Zhao Shanlan,Tian Hao,Qin Haoxiang,Li Xiaochen,Jian Zhao,Du Jiahui,Li Yanzhao,Wang Yanhong,Lin Lin,Liu Chen,Shang Yongning,He Lang,Xing Malcolm,Zeng Wen
During myocardial infarction, microcirculation disturbance in the ischemic area can cause necrosis and formation of fibrotic tissue, potentially leading to malignant arrhythmia and myocardial remodeling. Here, we report a microchanneled hydrogel suture for two-way signal communication, pumping drugs on demand, and cardiac repair. After myocardial infarction, our hydrogel suture monitors abnormal electrocardiogram through the mobile device and triggers nitric oxide on demand via the hydrogel sutures’ microchannels, thereby inhibiting inflammation, promoting microvascular remodeling, and improving the left ventricular ejection fraction in rats and minipigs by more than 60% and 50%, respectively. This work proposes a suture for bidirectional communication that acts as a cardio-patch to repair myocardial infarction, that remotely monitors the heart, and can deliver drugs on demand.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 29
·22899-22912
·
IF 2.779
Zhang Yinkai,Zhang Xuanhe,Ye Huijian,Xu Lixin
Polymer film capacitor with large power density is potentially embedded in energy suppliers and wearable devices. Currently, the strategy of polymer composite is an effective solution for the enhancement of energy density for dielectric film. Exploring the relation between neighboring interface and polarized response of composite is the primary route for the improvement of energy storage capability in polymer film. In this work, the interface with tailored electrical conductivity has been constructed in carbon-coated BaTiO 3 /poly(vinylidene fluoride-chlorotrifluoroethylene) (BT@C/P(VDF-CTFE)) composite. Core–shell BT@C particles with various calcined crystal structures were synthesized via sol–gel method with following carbonization. The calcination process affects the constitution of graphitic carbon that determines the electrical resistivity of received BT@C particles. The presence of carbon layer on the cubic BT core was evidenced by X-ray photoelectron spectroscopy and transmission electron microscope. BT@C/P(VDF-CTFE) composite with tailored conductive interface was prepared through the solution casting method. The electric displacement of composite is improved due to the interfacial polarization. The electrical resistivity depends on the permeation effect of interfacial carriers, resulting in the decrease of energy efficiency during charge–discharge cycle. The exploration between interface effect and polarization provides insightful prospects on interfacial design of polymer composite for film capacitor.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 10
·7606-7615
·
IF 2.22
Cai Haopeng,Wei Qinqin,Xiao Hongbo,Liu Hongwei,Wang Jun
The petal-like CoO/CNFs composites was synthesized in situ by a simple hydrothermal modus. Electromagnetic parameters of the CoO/CNFs composites are further adjusted by adjusting the weight fractional number of the CoO. A rich interface of CoO is introduced into the carbon nanofibers to form a flower-like composite. This unique flower-like layered structure and appropriate electromagnetic parameters effectively enhance the impedance matching and attenuation capabilities. When the mass ratio of CoO to CNFs is 2:1, the obtained flower-like CoO/CNFs composites achieves a maximum reflection loss of − 34.62 dB with a thickness of 3 mm at 7.8 GHz. At the same time, the effective absorption area is 2.89 GHz (7.035–9.925 GHz). Therefore, taking into consideration its excellent microwave absorption properties, the petal-like CoO/CNFs composites may be deemed as a high-efficiency absorbing agent that satisfies the impedance matching and attenuation characteristics.
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Journal of the Iranian Chemical Society
·
2022
·Vol. 19
·期 6
·2543-2551
·
IF 2.271
Ge Dandan,Zhang Yi,Deng Xiujun,Yuan Lin
In this study, a zinc-based MOF material-[Zn 2 (btc)(atrz)(H 2 O) 2 ]·2H 2 O (btc = benzene-1,2,4-tricarboxylic acid, artz = 4-amino-1,2,4-triazole) was designed and applied as a sorbent for the vortex-assisted micro-solid-phase extraction (VA-µ-SPE) of UV filters from water and toner samples, followed by high performance liquid chromatography-diode array detector determination. Parameters affecting VA-µ-SPE such as sorbent amount, desorption solvent, vortex time, desorption time, solution pH and salt concentration were optimized. Under the optimized conditions, linearity of the UV filters was obtained in the range of 5(10)–1000 ng mL −1 , and the correlation coefficient was higher than 0.9959. The limits of detection ranged between 1.5 and 3.2 ng mL −1 and limits of quantification were in the range of 4.2–10 ng mL −1 . The relative standard deviations were in the range of 2.3–7.1%. The recoveries for the spiked real samples were in the range of 90.7–111.3% with relative standard deviation less than 7.2%. It proved to be a fast, accurate and convenient method for extraction of UV filters from different matrices.
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Nano-Micro Letters
·
2019
·Vol. 11
·期 1
·1-17
·
IF 9.043
Cao Wentao,Ma Chang,Tan Shuo,Ma Mingguo,Wan Pengbo,Chen Feng
An ultrathin and flexible carbon nanotubes/MXene/cellulose nanofibrils composite paper with gradient and sandwich structure was successfully fabricated via a facile alternating vacuum-assisted filtration process.
The composite paper exhibits excellent mechanical property and electromagnetic interference shielding performance.
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危险品化学品经营许可证（带存储）