Polymers
·
2024
·Vol. 16
·期 5
·679
·
IF 4.7
Peng Li,Lei Wang,Xiaojuan Lai,Jinhao Gao,Zhiqiang Dang,Rong Wang,Fan Mao,Yemin Li,Guangliang Jia
Two acid thickeners, ADMC and ADOM, were prepared by aqueous solution polymerization using acrylamide (AM) and methacryloyloxyethyl trimethyl ammonium chloride (DMC) as raw materials, with or without the introduction of octadecyl polyoxyethylene ether methacrylate (OEMA). It was characterized by FTIR,1H NMR, and the fluorescence spectra of pyrene. The double-layer thickening mechanism of ADOM was proved by comparing the thickening and rheological properties of ADMC and ADOM tested by a six-speed rotary viscometer and a HAKKE MARSIV rheometer during the acidification process. The results showed that the synthetic product was the target product; the first stage of the self-thickening ADOM fresh acid solution during high-temperature acidification was mainly affected by Ca2+concentration, and the second stage of self-thickening was mainly affected by temperature. The residual viscosity of the 0.8 wt% ADOM residual acid solution was 250, 201.5, and 61.3 mPa·s, respectively, after shearing at 90, 120, and 150 °C for 60 min at a shear rate of 170 s−1. The thickening acid ADOM with a hydrophobic association structure has good temperature resistance and shear resistance, which can be used for high-temperature deep-well acid fracturing. In addition, no metal crosslinking agent was introduced in the system to avoid damage to its formation, and ADOM exhibited good resistance to Ca2+, which could provide ideas for the reinjection of the acidizing flowback fluid. It also has certain advantages for environmental protection.
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高影响因子
Toxics
·
2024
·Vol. 12
·期 11
·796
·
IF 3.9
Xintong Li,Baocheng Qu,Jingyao Wang,Hongxia Zhao
Environmentally persistent free radicals (EPFRs) generated on particles under irradiation in water have attracted particular attention, and their formation mechanisms are not well understood. This study investigated the photoformation of EPFRs on both actual samples collected from an oil production plant in Panjin, Liaoning, China, and simulated Fe(III)-montmorillonite samples in water. The EPFRs detected on actual samples were not easily generated compared with those in the soil or in the air, based on the concentrations of identified PAHs. EPR signals in the range of 1017to 1018spin/g were detected on the simulated Fe(III)-montmorillonite samples. Their g factors were smaller than 2.0030, which indicated the generation of carbon-centered EPFRs. The primary byproducts were identified by chromatography–mass spectrometry (GC-MS), and a possible EPFR formation pathway during PAH degradation was proposed. Hydrogenation of PAHs during the photoformation of EPFRs was observed and might be due to the catalysis of the simulated particles and the interaction of the intermediates. Meanwhile, the effects of the typical anions (NO2−and Cl−) and the surfactant (TWEEN®80 and sodium dodecyl sulfate) were investigated and indicated that the phototransformation process and adsorption process would affect the formation of EPFRs. Overall, our study provided useful information to understand the photoformation of EPFRs in aqueous environments.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 19
·28525-28537
·
IF 0
Qiu Rui,Chen Aiyin,Zhang Peng,Tang Xuejiao,Wang Cuiping,Sun Hongwen
Herein, novel catalysts of Fe-containing zeolite-A (Fe/zeolite-A) were synthesized by exchanging iron ions into zeolite-A framework, and short-chain organic acids (SCOAs) were employed as chelating agents. Reactive Brilliant Blue KN-R (KN-R) was used as a model pollutant to evaluate the performance of these catalysts based on the heterogeneous Fenton reaction. The results showed that Fe-OA/3A, which applied zeolite-3A as the supporter and oxalic as the chelating agent, presented the most prominent KN-R decolorization efficiency. Under the initial pH of 2.5, 0.4 mM KN-R could be totally decolorized within 20 min. However, the mineralization efficiency of KN-R was only 58.2%. Therefore, anthraquinone dyes were introduced to modify zeolite-3A. As a result, the mineralization efficiency of KN-R was elevated to 92.7% when using Alizarin Violet (AV) as the modifier. Moreover, the modified catalysts exhibited excellent stability, the KN-R decolorization efficiency could be maintained above 95.0% within 20 min after operating for nine cycles. The mechanism revealed that the Fe(II)/Fe(III) cycle was accelerated by AV-modified catalyst thus prompting the KN-R decolorization in Fenton-like system. These findings provide new insights for preparing catalysts with excellent activity and stability for dye wastewater treatment.
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RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2024
·Vol. 94
·期 2
·456-470
·
IF 0.9
Xia J.,Li X.,Lv C.,Jiang J.,Zhu T.,Liu T.,Li J.,Zhang W.
Abstract Resveratrol (Res), a non-flavonoid polyphenolic compound extracted from natural plants, has many pharmacological effects such as anti-tumor, organ protection, improvement of cardiovascular disease, and anti-inflammation. However, due to its poor water solubility and light-degradable property, its bioavailability is restricted. In this study, the hyaluronic acid (Ha)-coated poloxamer 188 (F68) and poloxamer 407 (F127) and Ha-coated Res nanomicelles (Ha-F68/F127-Res-Mc) were prepared by film dispersion method. The nanomicelles were evaluated by indicators of encapsulation efficiency ( EE ), drug loading ( DL ), particle size, polydispersity index and ζ-potential. Besides, using the Box–Behnken design (BBD) based response surface methodology (RSM), obtained the optimum prescription process to obtain the Ha-F68/F127-Res-Mc. Compared with the Res active pharmaceutical ingredient (API), Ha-F68/F127-Res-Mc had higher water solubility and photostability, and could achieve sustained release. Compared with the Res active pharmaceutical ingredient (API), Ha-F68/F127-Res-Mc had higher water solubility and photostability, and could achieve sustained release. In conclusion, the prepared nanomicelles have stronger cytotoxic effect on MCF-7 than doxorubicin (DOX). This will provide a basis for the development of Res antitumor injection, and provide a reference for the research on nano-delivery systems of other BCS II drugs in the future.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
·
2024
·
IF 3.6
Mao-Lan Zhang,Gui-Ping Zhang,Hong-Shuo Ma,Yu-Zhu Pan,Xiao-Ling Liao
Considering the differences in pH between bacterial infection microenvironment and normal tissues, a series of pH-responsive drug-release amphiphilic polyurethane copolymers (DPU-g-PEG) have been prepared in this work. Fourier transform infrared (FT-IR) spectroscopy and 1H NMR was selected to detect the structure of the condensed polymers. The DPU-g-PEG amphiphilic copolymers could form stable micelles with a hydrophilic shell of polyethylene glycol (PEG) and a hydrophobic core of polylactic acid (PLA). We loaded a model drug called triclosan onto DPU-g-PEG micelles and studied how pH affects their particle size, Zeta potential, and drug release performance. The results revealed that when exposed to acidic conditions, the surface potential of DPU-g-PEG micelles changed, the micelles’ particle size increased, and the drug release performance was significantly enhanced. These results suggested that the micelles prepared in this study can release more antibacterial substances at sites of bacterial infection. Meanwhile, we also investigated the impact of different ratios of soft and hard segments on the properties of micelles, and the results showed that the pH responsiveness of micelles was strongest when the ratio of soft segments (PLLA diol + PEG 2000): 1,6-hexamethylene diisocyanate (HDI): 2,6-Bis-(2-hydroxy-ethyl)-pyrrolo[3,4-f]isoindole-1,3,5,7-tetraone (DMA) = 1: 1.2: 0.2. Furthermore, the results of inhibition zone test, minimum inhibitory concentration (MIC), and minimum bactericidal concentration (MBC) all confirmed the antibacterial activity of triclosan-load DPU-g-PEG micelles. In conclusion, the DPU-g-PEG micelles produced in this study have the potential to be used as intelligent drug delivery systems in the biomedical field.
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高影响因子
The Innovation
·
2025
·
IF 25.7
Yuting Lin,Jianyu Zhang,Wen-Jin Wang,Zhenguo Tang,Xianying Fang,Xu Xu,Fritz E. Kühn,Zheng Zhao,Qiang Yong,Ben Zhong Tang,Xu-Min Cai
The aggregation process plays a significant role in regulating the aggregate structures from molecules toward macroscopic photophysical properties. Pyrene (Py), as the simplest dimer candidate, serves as a suitable model for studying the aggregation. Herein, a series of Py-based aggregation-induced emission (AIE) materials have been investigated by clarifying the comprehensive roles of oxygen, substituents, molecular motion, and packing during aggregation, initially realizing the aim of controlling aggregate structures. With a largely planar and conjugated conformation, Py shows anomalous AIE characteristics due to the oxygen quenching at the molecular level but turn-on fluorescence in the aggregate state because of the oxygen isolation. Although introducing substituents induces molecular motion and similarly weakened luminescence in the molecular state, the impact of substituents on the aggregate-state photophysical properties enormously differs, exhibiting from weak blue, strong cyan, and strong green to weak yellow emissions, due to variable aggregate structures. Interestingly, the natural alicycle-substituted Py-dehydroabietylamine (Py-DAA) exhibits both mechanochromism and acidichromism, which can be synergistically applied in dynamic encryption-decryption. This work not only elucidates the unique AIE property of Py for the first time but also clarifies the bridging role of aggregation between single-molecular and aggregate states, achieving preliminary control over the aggregate structures.
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高影响因子
Soft Matter
·
2025
·
IF 2.8
Feixue Gong,Na Du,Wan Guo Hou
Simple single-tailed amphiphiles (STAs) can form vesicles in their single-component aqueous solutions, under the mediation of solid surfaces, particularly through a dehydration-rehydration (DHRH) process. However, knowledge about the characteristics of the STA vesicle-systems thus obtained is still lacking. In the current work, the vesicles formed by the simple STAs alkyl trimethylammonium bromides (CnTABs), including dodecyl, tetradecyl, and cetyl ones (DTAB, TTAB, and CTAB), via a DHRH process were chosen. The aggregation numbers of the STA vesicles (Nv) were first estimated, and their fluorescence quenching kinetics was then investigated by the time-resolved fluorescence quenching (TRFQ) technique, which were compared with those of conventional vesicle systems. In particular, the mole fractions of CnTAB existing in the form of micelles (fm) in the vesicle systems were estimated using the TRFQ data. The Nv values of DTAB, TTAB, and CTAB were obtained to be ca. 7.33×104, 8.33×104, and 10.6×104, respectively, similar to those of conventional vesicles. In addition, the values of fluorescence quenching kinetic parameters obtained for the STA vesicle-systems are also similar to those of conventional vesicles. For the STA vesicle systems, vesicles coexist with micelles, but the fm significantly decreases with an increase in chain length. DTAB molecules exist mainly in the form of micelles (with fm ~0.82), while TTAB and CTAB exist mainly in the form of vesicles (with fm ~10‒5). Overall, the properties of STA vesicles are similar to those of conventional vesicles. This work deepens our understanding on the features of simple STA-based vesicles. Key words: Single-tailed amphiphile; Alkyl trimethyl ammonium bromide; Vesicle; Aggregation number; Fluorescence quenching kinetics.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Peipei Zhou,Qi Jing,Huili Wang,Xuedong Wang,He Mei
Increasing polycyclic aromatic hydrocarbons (PAHs) pollution in dietary is becoming a significant worldwide problem due to their direct threat to human health. To achieve rapid and sensitive detection of PAHs, nanocomposites were fabricated by confining ionic liquids (ILs) within magnetic covalent organic frameworks (MCOFs). After the confinement of [C 8 MIM][PF 6 ] into MCOFs, the resulting MCOF@8 C maintained high crystallinity comparable to that of the pristine MCOF, limited the diffusion of ILs and reduced the aggregation effect caused by their high viscosity. The MCOF@8 C/HPLC-FLD method gave low detection limits (0.01-0.15 µg kg -1 ), good recoveries (85.32-99.57%) with RSDs ≤ 5.03% for seven PAHs congeners across five types of edible oils. In general, this study not only provides an excellent substitute for conventional multifunctional composites, but also develops a superior methodology for monitoring trace-level PAHs in complicated food matrices.
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