JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
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2019
·Vol. 57
·期 20
·1386-1393
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IF 2.596
Alberto García-Peñas,Yu Wang,Alexandra Muñoz-Bonilla,Marta Fernández-García,Florian J. Stadler
The effect of the molecular weight on the lower critical solution temperature (LCST) has been discussed extensively, where LCST increased with molar mass, decreased or kept constant, which leads to confusion. This work is focused on the preparation of poly( N -isopropyl acrylamide) homopolymers, obtained in a wide molecular weights range. The LCST behavior is analyzed by calorimetry and rheology, and a deep study of molecular features is carried out for a better knowledge of the influence of various parameters involved on LCST. Finally, the molecular weight trend is observed, and its influence on LCST is compared with the effect of other parameters as polymer concentration in water, end-group effect, and tacticity. It is observed that other parameters such tacticity and end-group effect will affect the LCST behavior over molecular weight, if this one is not high enough. Furthermore, the study of the LCST ranges will be a useful tool for analyzing the molecular weight trends. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019 , 57 , 1386–1393
研究领域:
高分子科学
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温敏聚合物
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聚合物物理
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材料化学
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CARBOHYDRATE POLYMERS
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2026
·
IF 12.5
Shanshan Li,Lixin Xia,Shuo Wang,Ruibao Ju,Zi Han,Xiansen Lv,Baoqin Han,Jinhua Chi
Acute liver injury (ALI) caused by acetaminophen (APAP) has a high incidence rate worldwide, and severe cases may cause liver failure or even death. N -acetylcysteine (NAC), as an effective treatment drug approved for clinical application in ALI, has limitations such as a short half-life and the requirement for high-dose injections. Consequently, it is imperative to optimize new administration method of NAC and promote alternative therapeutic strategies for ALI. Herein, hydrogel patches ONC composed of oxidized chondroitin sulfate (OCS) and NAC-grafted CMCS were developed, and their reparative effects on APAP-induced ALI were investigated. ONC hydrogels exhibited excellent biocompatibility and appropriate biodegradability, and favorable hemostatic effects in the liver. In vitro experiments demonstrated that ONC could promote the proliferation and migration of hepatocytes, as well as the angiogenesis of HUVECs. By establishing an APAP-induced ALI model in mice, liver enzymes after ONC hydrogel patches treatment recovered to near-normal levels. Moreover, histological examination, RT-qPCR, and transcriptome sequencing results demonstrated that ONC patches could reduce the expression of inflammatory factors and apoptosis in the liver, while simultaneously activating antioxidant-related signaling pathways, thereby promoting the regeneration and functional repair of damaged tissues. Therefore, ONC hydrogel patches may be a promising alternative strategy for treating ALI.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2026
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IF 3.7
Zongying Li,Zihao Su,Hongyan Song,Chunxi Li,Hong Meng,Yingzhou Lu
Boron–nitrogen co-doped carbon materials (BNCM) have demonstrated remarkable potential applications in energy storage, catalysis, and adsorption owing to their unique structure and dual acidic and basic sites, and their efficient preparation is highly demanding. Here, we proposed a facile preparation method of BNCM by ball milling calcium carbide (CaC 2 ), BCl 3 and cyanuric chloride (C 3 N 3 Cl 3 ) at ambient temperature. The structure and composition of the BNCMs were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, Raman spectra, transmission electron microscope, etc ., and their adsorption performance for Congo red (CR) and methylene blue was investigated. The results show that BNCMs are nanosized mesoporous carbon materials with surface area of 385.3 m 2 ·g –1 and C, N and B-content of 74.6%, 6.6% and 2.4% respectively for BNCM-3. Furthermore, the contents of B and N can be regulated by the ratio of BCl 3 and cyanuric chloride to calcium carbide. BNCMs shows excellent adsorption performance for CR, with adsorptivity of 606 mg·g –1 at 2.1 μg·g –1 equilibrium concentration, making it suitable for the deep treatment of dye wastewater. Compared to Langmuir model, the Freundlich model can better describe the isothermal adsorption behavior. The removal rate of CR still remained 94.4% after 5 recycles. This study provides a green method for preparing boron–nitrogen co-doped carbon materials under mild conditions, which is of reference significance for the synthesis of other doped carbon materials.
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Journal of Water Process Engineering
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2026
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IF 6.7
Haolan Xiao,Weilin Wu,Xinyi Wang,Zezhen Zhang,Liming Xia,Wanyu Chen,Lili Wu
Membrane fouling remains one of the primary obstacles hindering the sustainable development of membrane technology. This study pioneers the controlled growth of PNIPAM hydrogel on TA/Fe 3+ /CA coatings via surface UV photocatalysis, resulting in the fabrication of temperature-responsive PNIPAM@PVDF-Fe/CA membranes featuring thermosensitive PNIPAM hydrogel coatings. The modified membrane's water contact angle decreased from 78° to 36° and achieved complete wetting within 2 s. Water absorption increased from 204 % to 236 %, while separation efficiency improved to 97.8 %. Furthermore, the PNIPAM hydrogel remains in a swollen state at room temperature. When the temperature approaches 32 °C, it undergoes a dramatic volume contraction. This rapid and reversible hydrophilic-hydrophobic transition, accompanied by significant changes in polymer volume, enables the membrane to achieve a high flux recovery rate of 97.29 % during 30–50 °C cyclic cleaning cycles, demonstrating outstanding thermally-induced self-cleaning capability. This study provides a novel approach for constructing hydrogel coatings on membrane surfaces while enabling recycling of modified raw materials, even after multiple cycles of modification, stable modified membranes can still be prepared. The thermosensitive response holds potential for enhancing membrane performance. Combining excellent mechanical properties with recyclability, this membrane demonstrates significant application potential in wastewater treatment.
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Advanced Composites and Hybrid Materials
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2026
·
IF 15.5
Li Fan,Tan Pengyu,Li Degui,Zhuge Xiangqun,Luo Kun,Ren Yurong,Chen Yimin,Luo Yujia,Yang Kaiwen,Lu Jianwei,Liu Dan,Lei Weiwei,Ma Aijing
The extraction of chitin/chitosan from biowaste shrimp shells involves the heavy use of strong acids and alkaline solutions, resulting in a series of decomposed amino acids in the extraction waste. Herein, we demonstrate a new strategy to grow FeNi nanoalloys encapsulated in nitrogen-doped carbon nanotubes (3FeNi-NCNTs) at a high percentage by sintering the extracted amino acids, FeCl 3 , NiCl 2 and melamine at 900 ℃ in N 2 . The FeNi-NCNT exhibits a competitive limiting current density in oxygen reduction reaction (ORR) to the commercial 20% Pt/C, with the onset potential and half-wave potential at 0.98 V and 0.84 V versus RHE. The oxygen evolution reaction (OER) performance also rivals the RuO 2 catalyst, and the overpotential (E j =10 mAcm -2 - E 1/2 ) of as low as 0.76 V, highlighting a green pathway to yield superior bifunctional catalysts at low cost. When used in zinc-air batteries (ZABs), the aqueous ZAB showed excellent cyclic and rate performance, together with the peak power density and specific capacity of 173.6 mW cm -2 and 809.9 mAh g -1 (corresponding to an energy density of XXX Wh kg -1 based on the mass of consumed zinc); and the flexible ZAB with a polyacryl-amide hydrogel electrolyte also exhibited a high peak power density of 133 mWcm -2 and a long cycle life of 140 h, superior to the reference Pt/RuO 2 -based ZABs, highlighting a sustainable biowaste upcycling of shrimp shell valorization on energy storage. Graphical
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2026
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IF 3.1
Zhang Yili,Deng Jingyu,Yang Zitong,Qi Wenkai,Dai Xinyi,Zhang Yuxia
In the study, we present a molten salt-assisted hard-templating strategy for synthesising cobalt and nitrogen-doped carbon nanoflowers (Co/N-CNFs) as high-performance electrocatalysts for highly sensitive and selective electrochemical dopamine detection. The hierarchical surface roughness and excellent conductivity of Co/N-CNFs, combined with their uniformly dispersed Co sites, facilitate exceptional electrocatalytic performance toward dopamine oxidation. Electrochemical measurements demonstrated that the Co/N-CNFs composite exhibited outstanding performance for dopamine sensing, featuring a broad linear response range from 1 to 1000 µM and an exceptionally low detection limit of 0.13 µM. Moreover, the sensor exhibited remarkable stability, excellent anti-interference capability, and high accuracy in actual sample analysis. The work presents an innovative design strategy for Co/N-doped carbon catalytic systems, enabling the detection of dopamine in spiked human serum samples.
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APPLIED CATALYSIS A-GENERAL
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2026
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IF 4.8
Siyu Yi,Guobin Zhou,Yi Wang,Mengxia Ji,Jinman Yang,Yi Zhang,Pengcheng Yan,Zhao Mo,Zhaolong Wang,Junjie Yuan,Hui Xu,Xiaojie She
Electrocatalytic CO 2 methanation is promising for carbon neutrality but hindered by complex multi-electron transfer process, thereby obtaining low product selectivity. Herein, we report a copper single atom catalyst anchored on nitrogen doped carbon nanotubes (Cu-N-CNTs) for efficient electrocatalytic CO 2 methanation. By synergistically regulating the precursor, Cu-N 4 active sites are precisely constructed at the atomic scale, effectively suppressing copper aggregation. In situ characterization indicates that the catalyst forms a moderate local alkaline microenvironment during the reaction, suppressing C-C coupling side reactions and promoting methane pathways. In the flow cell, Cu-N-CNTs achieve a FE CH4 of 59.2% and a partial current density of 168.7 mA cm −2 at −1.577 V vs. RHE, and operated stably for 10 h. Moreover, Cu-N-CNTs exhibit remarkable methane selectivity in membrane-electrode assembly (MEA) systems employing both alkaline and pure-water electrolytes. A scaled-up MEA prototype further verifies the outstanding operational stability of Cu-N-CNTs under practical conditions. These results collectively underscore the substantial potential of Cu-N-CNTs for industrially relevant electrocatalytic CO 2 methanation.
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Food Packaging and Shelf Life
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2026
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IF 10.8
Jing Kang,Nan Du,Huimin Wu,Yang Li,Tianbin Li,Alideertu Dong
Fresh meat is rich in nutrients and, compared to frozen meat, offers a more flavorful taste, making it a common ingredient in daily life. However, during storage, fresh meat exudes natural juices. The abundant moisture and nutrients in these juices promote microbial proliferation, thereby accelerating meat spoilage. Therefore, controlling microbial contamination during the storage, transportation, and preservation of fresh meat is particularly important. Among various antimicrobial materials, N -halamine-based antimicrobial materials have gained increasing research attention in recent years due to their excellent characteristics, such as broad-spectrum antimicrobial activity and renewable functional groups. This study investigates the potential application of N -halamine polymers in antimicrobial packaging for fresh meat preservation. The results show that incorporating N -halamine antibacterial polymers (PAMPS-Cl) into absorbent pads exhibits outstanding antibacterial performance (sterilization rate>99.99%). Subsequent application studies on fresh meat preservation indicate that N -halamine-based antimicrobial packaging materials can significantly reduce the total microbial count in fresh meat, thereby improving its sensory qualities. The shelf life of fresh meat can be extended to the 8th days at 4 °C, prolonging the shelf life compared to the group without preservation treatment, where the total bacterial count exceeded the microbiological limit for fresh meat between the 4th and 6th days. This highlights their considerable potential for research and practical application in the fields of fresh meat packaging and preservation.
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NANO
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2026
·
IF 1.3
Keqiang Zhu,Jincheng Wang,Xinxin Tan,Zhiyong Jia,Yun Wang,Chuang Zhang
Developing efficient and cost-effective oxygen reduction reaction (ORR) catalysts is crucial for advancing clean energy technologies. In this study, the 3D polypyrrole aerogel was synthesized using methyl orange as a soft template. The subsequent in-situ spatially confined pyrolysis ensures the atomic dispersion of Co-N x active sites while effectively suppressing metal agglomeration. The optimized CoNC-150 catalyst exhibited a high surface area (298.53 m 2 /g) and well-distributed cobalt-coordinated active sites (Co-N 4 ), significantly enhancing ORR performance. Electrochemical evaluations demonstrated an exceptional half-wave potential of 0.886 V, closely approaching that of commercial 20 wt% Pt/C (0.892 V). The catalyst followed a fourelectron transfer pathway, ensuring efficient ORR kinetics. Remarkably, this robust 3D monolithic architecture endows the catalyst with exceptional stability in alkaline media. Long-term durability tests over 40,000 cycles confirmed their remarkable stability, with only a 0.008 V loss in half-wave potential, significantly lower than the 0.022 V loss in Pt/C under similar conditions. The degraded CoNC-150 exhibited a half-wave potential of 0.878 V, significantly outperforming Pt/C (0.870 V). Kinetically, CoNC-150 exhibits a Tafel slope of 146.16 mV/dec, indicating favorable ORR dynamics. These results highlight the potential of CoNC-150 as a highly active and durable non-precious metal catalyst (NPMC) for ORR applications. This study provides valuable insights into the rational design of transition metal-based electrocatalysts, offering a promising route toward scalable and sustainable energy conversion technologies.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2026
·Vol. 109
·期 4
·e70709
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IF 4.2
Quanwei Jiang,Zhibin Chen,Zhen Tian,Jianbo Li,Xiaowei Shi,Huijun Kang,Zongning Chen,Enyu Guo,Tongmin Wang
Calcium titanite, as an eco-friendly thermoelectric material, offers great potential for thermoelectric power generation. However, the polar metal–oxygen bonds place a low ceiling on the electrical conductivity, thereby limiting the overall thermoelectric performance. In this work, high-purity Ca 1- x Pr x Ti 0.95 Nb 0.05 O 3 ( x = 0–0.20) compounds are synthesized to investigate the electrical and thermal transport features. Nb doping enhances bond covalency, as confirmed by electron localization function (ELF) and crystal orbital Hamilton population (COHP) analyses. This enhancement leads to high carrier mobility by weakening the electron–phonon coupling, a mechanism verified by direct electron–phonon coupling calculations. Meanwhile, the multiscale hierarchical architectures, including dual point defects, nanoprecipitates, dislocations, etc., originating from the large mass and strain field fluctuations, further reduce the lattice thermal conductivity close to the minimum value estimated from Cahill's model. A peak ZT value of 0.33 is acquired for Ca 0.90 Pr 0.10 Ti 0.95 Nb 0.05 O 3 at 1073 K, approximately 267% higher than that of the pristine CaTiO 3 sample. Our investigation highlights that weakening the carrier–phonon coupling by modulating chemical bonding is a reasonable strategy, which could be applied in other thermoelectric systems.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2026
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IF 3.9
Doudou Li,Xingyu Zhou,Yu Feng,Weiwei He,Lifen Zhang,Zhenping Cheng
The search for innovative and cost-effective flame-retardant polymers is attracting increasing interest in both the academics and industrial community. In this work, flame-retardant polymers with high performance are developed through a monomer-to-polymer strategy. Specifically, biobased N–P synergistic vanillin-based acrylate monomers (MAPDVAs) are designed and synthesized, which are then polymerized via reversible addition–fragmentation chain transfer (RAFT) polymerization to obtain a biobased polymer, namely, PMAPDVA. The obtained PMAPDVA (Mn,GPC = 39100 g/mol) has a high residual carbon content of about 42.0 wt % at 800 °C. The peak heat release rate (PHRR) of PMAPDVA is only 62.0 W/g in a micro calorimeter (MCC) test, confirming excellent flame-retardant efficiency. The PHRR and the total heat release rate (THR) of poly 2-ethylhexyl acrylate (2-EHA) decreased by 33.8% and 42.7%, respectively, when 30.0 mol % MAPDVA was copolymerized. In addition, the copolymer coatings display light transmission more than 80% in the range of 380–780 nm, indicating fine transparency of the copolymer and satisfying compatibility of PMAPDVA. Finally, scanning electron microscopy (SEM) and thermogravimetric analysis infrared (TGA-IR) are applied to explore the flame-retardant mechanism of the resultant polymers. This work provides a key clue for the preparation of flame retardants from natural products.
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ACS Applied Materials & Interfaces
·
2026
·Vol. 18
·期 35
·48341-48350
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IF 7.8
Lu Chunyan,Li Mingjin,Li Wen,Deng Haoyun,Jiang Jutao,Wang Pengxi,Yang Biao,Yang Cheng,Li Xiaodong,Hu Ziyang,Zhang Wenjun
Inverted perovskite solar cells (PSCs) often suffer from inefficient electron extraction due to the intrinsically p-type nature of the perovskite surface at the electron transport layer interface. Here, we report a near-surface sulfidation strategy using dibutyl sulfide (DBS) to induce a surface p-to-n transition, which creates a near-surface electric field that facilitates electron extraction and suppresses interfacial recombination. Simultaneously, the formation of Pb-S coordination bonds passivates undercoordinated Pb 2+ defects, reducing nonradiative recombination losses. As a result, DBS-treated inverted PSCs achieve a champion power conversion efficiency of 26.28% with a high open-circuit voltage of 1.191 V. The treated devices also exhibit enhanced thermal stability, retaining 91% of their initial efficiency after more than 700 h of aging at 85 ° C in a N 2 atmosphere. This work presents a simple yet effective surface engineering approach that simultaneously enhances both the efficiency and stability of inverted PSCs.
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危险品化学品经营许可证（带存储）