LANGMUIR
·
2021
·
IF 3.882
Huimin Kong,Wenjie Zhang,Ge Shi,Zhe Cui,Peng Fu,Minying Liu,Yanjie He,Xiaoguang Qiao,Xinchang Pang
A colloidal nanocrystal cluster (CNC) is a hierarchical nanostructure formed by clustering several nanocrystals into one nano-ensemble, which may exhibit unique optical or catalytic properties different from individual nanocrystals owing to the mutual interactions among neighboring component nanocrystals. However, there is still no universal synthetic route that could be applicable to diverse material compositions with precisely controlled hierarchical structures (i.e., nanocrystal number density, component nanocrystal size, and overall diameter of the CNC) up to now. Herein, a general and novel synthetic strategy was reported for crafting a wide range of inorganic CNCs (i.e., noble metal, semiconductor, and metal oxide) via utilizing amphiphilic star-like poly(4-vinylpyridine)-block-polystyrene diblock copolymers as nanoreactors prepared by sequential atom transfer radical polymerization. The hierarchical structure of rationally designed CNCs could be readily tailored by varying the P4VP molecular weight of star-like nanoreactors and the parameter optimization during the CNC preparation process, which was inaccessible by conventional synthetic methods.
研究领域:
材料科学
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纳米技术
·
化学工程
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产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Shusu Ren,Xiang Xu,Jiyuan Sun,Haitao Zhao,Weiwei He,Lifen Zhang,Zhenping Cheng
Antimicrobial resistance is still a major clinical challenge worldwide today and the development of novel antimicrobial agents with high antimicrobial activity and low bacterial resistance is of great importance. In this work, quaternized 2-(dimethylamino) ethylmethacrylates iodonium salt-type monomers with different lengths of pendent alkyl (qDMAEMA(C x ), x = 3, 6 and 8) are synthesized for preparation of a series of cationic porphyrin-based star-shaped (co)polymers by photo-controlled bromine-iodine transformation reversible-deactivation radical polymerization (BIT-RDRP). Especially, qDMAEMA(C x ) not only acts as a monomer but also can be used as an intrinsic catalyst for the BIT-RDRP. In addition, effects of alkyl chain length (x), degree of polymerization and hydrophilic-hydrophobic balance ( H.L.B. ) on the antibacterial activity of the prepared (co)polymers are investigated. The resulting zinc ion coordinated copolymers [email protected] (qDMAEMA(C 8 ) 20 - co -PEGMA 35 ) (denoted as [email protected] ) exhibits good water solubility and is able to be absorbed effectively on the surfaces of bacteria, exhibiting excellent photodynamic inhibition activity against both S. aureus and E. coli under irradiation with 570 nm light source according to the coated plate experiments. The minimum bactericidal concentration (MBC) of [email protected] against S. aureus and E. coli are 1.5 and 2.0 μM, respectively, in the presence of light. Meanwhile, [email protected] shows quite low cytotoxicity and satisfying photolysis ability at working concentrations, displaying promising biological application prospects.
研究领域:
高分子化学
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材料科学
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生物医学工程
·
微生物学
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产品关联
DOI
高影响因子
Journal of Animal Science and Biotechnology
·
2022
·Vol. 13
·期 1
·1-13
·
IF 6.175
Zhou Xiaoge,Mo Zhaoyi,Li Yankun,Huang Liang,Yu Sihai,Ge Lan,Hu Yamei,Shi Shengjie,Zhang Lutong,Wang Liguang,Gao Lei,Yang Gongshe,Chu Guiyan
Background Oleic acid is an abundant free fatty acid present in livestock that are in a negative energy-balance state, and it may have detrimental effects on female reproduction and fertility. Oleic acid induces lipid accumulation in bovine granulosa cells, which leads to a foam cell-like morphology and reduced steroidogenesis. However, why oleic acid increases lipid accumulation but decreases steroidogenesis remains unclear. This study focused on oleic acid’s effects on lipid type and steroidogenesis. Results Oleic acid increased the lipid accumulation in a concentration-dependent manner and mainly increased the triglyceride level and decreased the cholesterol ester level. Oleic acid also led to a decline in estradiol and progesterone production in porcine granulosa cells in vitro. In addition, oleic acid up-regulated the expression of CD36 and diacylglycerol acyltransferase 2, but down-regulated the expression of 3-hydroxy-3-methylglutaryl-coenzyme A reductase, scavenger receptor class B member 1 and acetyl-Coenzyme A acetyltransferase 2, as well as steroidogenesis-related genes, including cytochrome P450 family 11 subfamily A member 1, cytochrome P450 family 19 subfamily A member 1 and 3 as well as steroidogenic acute regulatory protein at the mRNA and protein levels. An oleic acid-rich diet also enhanced the triglyceride levels and reduced the cholesterol levels in ovarian tissues of female mice, which resulted in lower estradiol levels than in control-fed mice. Compared with the control, decreases in estrus days and the numbers of antral follicles and corpora lutea, as well as an increase in the numbers of the atretic follicles, were found in the oleic acid-fed female mice. Conclusions Oleic acid changed the lipid type stored in lipid droplets of ovarian granulosa cells, and led to a decrease in steroidogenesis. These results improve our understanding of fertility decline in livestock that are in a negative energy-balance state.
研究领域:
生殖生物学
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内分泌学
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动物科学
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DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Rui Liu,Wanfen Pu,James J. Sheng,Daijun Du
This work fabricated a novel star-like hydrophobically associative polyacrylamide called SHPAM used in enhanced oil recovery (EOR) processes in harsh reservoir conditions. SHPAM composed of a core of nano-silica and a layer of amphiphilic-polymeric chains was synthesized via a facile water free radical polymerization. It was systematically characterized using TEM, SEM, IR, 1 H NMR and DLS. Measurements from solubility, thickening efficiency, long-term stability and rheological performance indicated that the three-dimensional microstructure and intermolecular associations provided SHPAM solution with fantastically comprehensive properties, outperforming hydrophobically associative polyacrylamide. The evidence from rectangle cores in a serial model experiments implied that SHPAM was well compatible with permeable cores and it had desirable injectivity with sustainable mobility control in porous media. Moreover, core flooding tests revealed that after extensive water flooding, SHPAM with the concentration of 1500 mg/L increased the oil recovery factor by 20% in sandstone cores. This study showed the robust potential of SHPAM as a polymer flooding candidate in high temperature and high salinity reservoirs where harsh conditions associated with lack of fresh water constrain the applications of conventional polymers.
研究领域:
石油工程
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高分子化学
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DOI
高影响因子
POLYMER
·
2010
·Vol. 52
·期 2
·391-399
·
IF 3.573
Yuan Meng,Xing-Hong Zhang,Bin-Yang Du,Bo-Xuan Zhou,Xin Zhou,Guo-Rong Qi
Core crosslinked star (CCS) polymers, which have crosslinked poly (divinyl benzene-co-styrene) [P(DVB-St)] core and multiple arms of polystyrene- b -poly(ethylene oxide) diblock copolymer (PEO- b -PS) [denoted as PEO- b -PS/P(DVB-St) CCS], were synthesized via atom transfer radical polymerization(ATRP). PEO- b -PS/P(DVB-St) CCS polymer was spherical with average diameters of scores of nanometers from transmission electron microscopy (TEM) and dynamic light scattering (DLS), and blended with diglycidyl ether of bisphenol (DGEBA) and 4,4′-diamino diphenyl methane (DDM) in tetrahydrofuran (THF). With 5 or 10 wt% PEO- b -PS/P(DVB-St) CCS polymer, spherical core–shell nanodomains with average diameters of 29 or 32 nm were observed from atomic force microscopy (AFM), which were randomly distributed in the resultant thermosets . Considering the difference in miscibility of the epoxy with P(DVB-St) and PEO- b -PS after and before curing reaction, a reaction-induced microphase separation (RIMPS) mechanism was proposed to account for the formation of the core–shell nanodomains in the thermosets . During curing, the RIMPS of PS subchain occurred but was confined by P(DVB-St) core, resulting in formation of thermoplastic PS shell around the crosslinked core. Such core–shell nanodomain could be easily etched away by THF, whereas the control thermosets containing PEO/P(DVB-St) CCS polymer could not be etched by THF. The glass transition temperatures ( T g s) of the epoxy thermosets containing PEO- b -PS/P(DVB-St) CCS polymer were significantly improved compared with pure epoxy thermosets.
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DOI
高影响因子
FOOD CONTROL
·
2026
·
IF 7
Xiangmin Kuang,Qingbo Huang,Jiapeng Wu,Sakamon Devahastin,Chaofan Guo,Yongli Jiang,Junjie Yi
Pesticide residues on dried star anise remain major barrier to product safety and quality; current washing practices unfortunately fail to balance decontamination efficiency with retention of bioactive compounds. Suitability of emerging decontamination media, in particular alkaline electrolyzed water (ALEW), for star anise has nevertheless not been assessed. The present study therefore compared use of ALEW with use of conventional methods at ambient and high-temperature conditions to decontaminate star anise; four representative fungicides were tested. Quality of dried star anise was then determined in terms of color, rehydration behavior, shikimic acid and volatile oil contents. ALEW treatment at ambient temperature provided superior pesticide reduction (9.3–14.7%) compared with other treatments; such treatment also led to enhanced rehydration capacity and color. Unexpectedly, high-temperature soaking markedly reduced effectiveness of ALEW and caused significant losses of shikimic acid and volatile oils. Machine learning modeling identified support vector regression as most accurate tool to predict influences of pH, soaking temperature and soaking time of ALEW on pesticide residues decontamination and reveals distinct parameter sensitivities among different pesticides. Short-duration, ambient ALEW treatment offers practical and quality-preserving solution for pesticide control in star anise processing, with clear implications for sustainable spice manufacturing.
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产品关联
DOI
高影响因子
POLYMER
·
2026
·
IF 5.1
Tianyu Liu,Xuening Li,Yunhan Wu,Yunjie Cai,Tong Shen,Mingmei Wang,Xinping Zhang,Zezhong Lin,Rongchao Xue,Chong Wang,Guiying Zhu
PVC as an important plastic material, has gained widespread application due to its excellent physical properties, good heat and chemical resistance, as well as low cost. By incorporating plasticizers and other plastic additives, rigid PVC can be extended to applications in the flexible PVC field. However, conventional low-molar-mass phthalate plasticizers tend to migrate from the PVC matrix to the external environment during long-term use. This migration not only deteriorates the physical properties of PVC but also poses risks to human health and the environment. Therefore, improving the stability of plasticizers in PVC materials is of great significance.In this study, two structurally different plasticizers were prepared by hydroxyl-initiated ring-opening polymerization of ε-caprolactone. The mechanical properties of PVC plasticized with Lignin-PCL, C 5 H 12 O-PCL, and the conventional plasticizer DOP were compared. The results show that PVC plasticized with Lignin-PCL exhibited improved mechanical properties compared to those plasticized with the conventional plasticizer. Interestingly, the hyperbranched plasticized PVC demonstrated higher modulus, strength, and toughness than its linear counterpart. The resulting plasticized PVC materials exhibited a high modulus of approximately 30 MPa while ensuring an elongation at break exceeding 300%. The migration rates of all Lignin-PCL-PVC samples were below 5%, which is only 0.026 times that of DOP-PVC. Moreover, as both lignin and PCL are degradable and environmentally friendly materials, the degradation performance of the materials was also investigated. The study found that the hyperbranched plasticizer Lignin-PCL could be degraded by more than 80%, which is crucial for the development of environmentally friendly flexible PVC materials.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Xuesong Chen,Lida Wang,Zhongqiang Yu,Xu Chen,Wen Sun,Zhengqing Yang,Qian Wang,Junhai Luo,Guichang Liu
Synergistic scale inhibition integrating electrochemical water softening (EWS) with scale inhibitors is proposed as a process-intensified strategy to mitigate scaling and enable higher cycles of concentration (CoC) in circulating cooling water systems. Distinct from conventional linear UCST-type polymers, the star-shaped topology introduces a confined internal architecture and elevated local functional group density, which strengthen cooperative intramolecular hydrogen bonding and enable a sharper and more controllable upper critical solution temperature (UCST) transition. A temperature-responsive star-shaped polymer scale inhibitor (star-SI) was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization and exhibits reversible conformation contraction–expansion behavior. At high temperatures, the scale inhibition performance of star-SI remains unaffected by the electric field and electrode reactions, achieving an inhibition efficiency exceeding 95%. At low temperatures, star-SI does not interfere with cathodic precipitation in EWS, yielding a CaCO 3 precipitation rate of up to 16.05 g/(m 2 ·h) at 36 A·m −2 . Molecular simulations and electrochemical analyses indicate that star-SI adopts a contracted conformation at low temperatures and exhibits negatively charged characteristics near the cathode and alkaline interfaces, thereby minimizing interference with electrochemical softening. Additionally, star-SI adsorbs onto the surface of CaCO 3 crystals, modulating growth kinetics and delaying nucleation at the heating interface. This synergistic system enables a novel treatment mode of room-temperature hardness removal and high-temperature scale inhibition.
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2026
·
IF 4
Hui Bai,Yinan Zhao,Shuxian Zhang,Lei Chen
Star-Phe-CD exhibited enhanced host-guest recognition. • The prepared CSP presents superior selectivity with an α value from 1.55 to 1.9. • Simultaneous separation of two catechin epimer pairs is realized. • The CSP enables efficient monitoring of epimer transformation by LC-MS. • The chiral recognition mechanism is clarified via molecular docking. The active ingredients of natural products represent a critical source for innovative drug discovery. However, the poor stereochemical stability and transformation of stereoisomers during storage directly influence therapeutic efficacy and safety. Therefore, the development of new chiral stationary phases (CSPs) with high chiral and structural selectivity is imperative for reliable quality control of natural products. Here, a star phenylalanine cyclodextrin (CD) polymer, Star-Phe-CD, was designed and synthesized. It features a CD parent nucleus, with Phe-derivatized CD as the sidechain monomers. Subsequently, a mixed-mode Sil-Star-Phe-CD CSP was fabricated with Star-Phe-CD as the chiral ligand, which exhibited significant fluorescence enhancement effects and multiple mixed-mode chromatographic retention mechanisms. The Sil-Star-Phe-CD CSP exhibits exceptional shape selectivity and stereoselectivity towards structurally similar analytes, demonstrating outstanding stereoseparation selectivity for analytes with rigid structures or multiple benzene rings with α lansoprazole = 1.90 and α atropine = 1.55, respectively. Coupled with LC-MS analysis, an online approach was established to simultaneously separate two pairs of catechin epimers and monitor their epimerization process. Molecular docking studies revealed the mechanism of chiral recognition, which relies on the cooperative effects of diverse intermolecular interactions, including hydrogen bonding, π–π interactions, and hydrophobic interactions. These interactions are crucial for recognizing structurally similar stereoisomers in complex systems.
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DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
Guiru Ding,Xudong Liu,Weidong Yu,Yan Bing,Ning Sun,Hongji Jiang
To investigate the effects of trifluoromethyl and tert -butyl moieties on the general optoelectronic properties of star-shaped hosts based on phenyls substituted carbazole, we used 3,6,9-tris (4-( tert -butyl)-phenyl)-9 H -carbazole ( M1 ) as a reference, and different numbers of electron-withdrawing 3,5-bis(trifluoromethyl) benzene were introduced into 3, 6 and 9 positions of carbazole to obtain compounds 9-(3,5-bis(trifluoromethyl)phenyl)-3,6-bis(4-( tert -butyl)phenyl)-9 H -carbazole ( M3) , 3,6-bis(3,5-bis(trifluoromethyl)phenyl)-9-(4-( tert -butyl)phenyl)-9 H -carbazole ( M5) and 3,6,9-tris(3,5-bis(trifluoromethyl)phenyl)-9 H -carbazole ( M6) . After the introduction of 3,5-bis (trifluoromethyl) benzene, the thermal temperature at 5 % mass loss of M3 , M5 and M6 decreased to 344 °C, while the glass transition temperature and melting point of M3 and M5 showed a significant increase. However, M6 did not show obvious glass transition, but its melting point also showed a significant increase. M3 crystallized at 125 °C as evidenced by differential scanning calorimetry, and the linking model of M3 is helpful to crystalize. In addition, when compared with those of M1 , the fluorescence emission peaks of M3 and M6 showed a blue-shift, while M5 showed a red-shift, all of which were in the deep blue emission range. The color purity of blue light for M1 in tetrahydrofuran solution is the highest, and M1 exhibit aggregation-induced emission characteristics. Compared to the photoluminescence quantum efficiency (PLQY) of compound M1 of 39 % in toluene, the PLQYs of M3 and M6 decreased to 34 % and 29 %, and the PLQY of M5 increased to 46 %. The function of the lowest unoccupied molecular orbital trap of M3 film under the external electrical field will increase, which not only offsets the increasing effect of the electrical field to the electron carrier and further decreases the carrier mobility when the electrical field increase, and the same situation is also feasible for the highest occupied molecular orbital traps in M5 , M6 and M1 . The organic blue light emitting diodes were prepared by using M1 , M3 , M5 and M6 as the hosts of bis [2-(4,6-difluorophenyl)pyridinato-C 2 ,N](picolinato)iridium, and the optimized device of M1 as the host showed the best performance with a maximum luminescence brightness of 2978 cd/m 2 , maximum current efficiency of 39.42 cd/A and maximum external quantum efficiency of 18.36 %.
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2015
·
IF 2.358
Jie Yi,Congshu Huang,Haiyan Zhuang,Hui Gong,Chuyi Zhang,Runtao Ren,Yupu Ma
The star-shaped polyester polyols based on initiators (trimethylolpropane or pentaerythritol) and ɛ-caprolactone were prepared by polycondensation reaction. The degradable polyurethane (PU) films were prepared by mixing star-shaped polyester polyols and crosslinker agent (hexamethylene diisocyanate trimer). The hydrolytic degradation and water absorption experiments demonstrated that the PU films could erode in artificial sea water, which were controlled by varying the ratios of ɛ-caprolactone/trimethylolpropane and the arm number of star-shaped polyester polyols. The mechanical properties of PU films and coatings increased with decreasing the ratios of ɛ-caprolactone/trimethylolpropane and increasing the arm number of star-shaped polyester polyols. The surfaces of PU films and coatings kept eroding, which were revealed by scanning electron microscopy. The copper ion release rates from PU coatings reached steady state at about 31 days. The marine field tests of PU coatings demonstrated that the degradable PU coatings based on star-shaped polyester polyols were effective coatings for marine antifouling.
研究领域:
材料科学
·
海洋生物学
·
化学工程
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DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Chen Qijing,Shi Ting,Han Fei,Li Zihan,Lin Chao,Zhao Peng
A hydrophobic CCS polymer of poly(benzyl methacrylate) (PBzMA) was prepared in toluene by reversible addition-fragmentation chain transfer (RAFT)-mediated dispersion polymerization. The CCS polymer, with poly(benzyl methacrylate) as the arm and crosslinked N , N ′-bis(acryloyl)cystamine (BAC) as the core, was confirmed by characterization with gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR) spectroscopy. Three kinds of oils (toluene, anisole and styrene) were chosen to study the emulsification properties of PBzMA CCS polymer. The oils can be emulsified by CCS polymer to form water-in-oil (w/o) emulsions. Moreover, w/o high internal phase emulsions (HIPEs) can be obtained with the increase of toluene and styrene volume fractions from 75% to 80%. Porous polystyrene monolith and microparticles were prepared from the emulsion templates and characterized by the scanning electronic microscopy (SEM). With the internal phase volume fraction increased, open-pore porous monolith was obtained.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）