Journal of Macromolecular Science Part B-Physics
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2022
·
IF 1.366
Zengze Chu,Chen Liu,Xinxi Zhang
Copper(I) thiocyanate (CuSCN) is a cost-effective and excellent inorganic p-type semiconductor; it has attracted considerable attention as hole-transporting material for highly efficient perovskite solar cells (PSCs) in recent years. However, various interface issues are currently regarded as the main obstacles for the CuSCN-based PSCs. Herein, we designed and synthesized a star-shaped oligomer (SFX-10) based on a spiro(fluorene-9,9’-xanthene) core terminated with fluorene groups by a simple Sonogashira coupling reaction, and its molecular structure was characterized with 1H, 13C NMR spectra and a high-resolution mass spectrum. The thermal, optical, and electrochemical properties of SFX-10 were fully investigated. SFX-10 shows good thermal stability with a high glass transition temperature of 138 °C. The photovoltaic performance measurements demonstrated that the CuSCN-based PSC using SFX-10 as an interlayer shows an evident improvement in power conversion efficiency of 6.61% compared with 5.52% for the bare device due to the passivation effect of the perovskite surface and the enhancement of the interfacial contact between the perovskite and CuSCN layers.
研究领域:
材料科学
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光伏技术
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有机电子学
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半导体材料
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DOI
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Polymer Chemistry
·
2014
·Vol. 5
·期 15
·4580-4588
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IF 5.368
Yang Wang,Bo Liu,Xue Wang,Wei Zhao,Dongtao Liu,Xinli Liu,Dongmei Cui
Catalyst systems obtained from the inexpensive, ligand-free and commercially available MgnBu2 and alcohols were used for the ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) under mild conditions. The catalytic system of MgnBu2/Ph2CHOH showed very high activity as compared with the system of MgnBu2/Ph3COH, which applied a more bulky methanol derivative. Interestingly, in the presence of excess amount of alcohol (Ph2CHOH), i.e., varying the OH-to-Mg ratio in a wide range from 10 : 1 to 800 : 1, the system MgnBu2/Ph2CHOH still remained highly active, and produced up to 800 polycaprolactone (PCL) chains per Mg center, suggesting a “living immortal” polymerization mode. The molecular weights of the obtained PCLs are accurately controlled when the ratio of [CL]0/[Mg]0 changed from 500 to 8000 together with narrow molecular weight distributions. Moreover, diblock PCL-b-PLA copolymers with narrow PDIs have been facilely achieved. Furthermore, the allyl- and propargyl-functionalized diphenylmethanols could be employed as the chain transfer agents (CTA) in this system for in situ construction of allyl- and propargyl-functionalized PCLs that were facilely modified further to PCLs with multiple functionality as building blocks for amphiphilic and topological microstructured PCLs via coupling and click reactions.
研究领域:
高分子化学
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材料科学
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FOOD CHEMISTRY
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2023
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IF 8.8
Ying Xu,Jun Qi,Manman Yu,Ruishu Zhang,Hengxun Lin,Huimin Yan,Chao Li,Jingmin Jia,Yong Hu
This study aimed to determine the efficacy of star anise dietary fiber (SADF) in alleviating the oxidative damage of myofibrillar protein (MP) from the perspective of volatile components. SADF and SADF without essential oils (EOs) (NSADF) were added to oxidized MP. The addition of NSADF and SADF improved the water-holding capacity (WHC) and gel strength, with the 0.4% addition showing the highest values. Moreover, the WHC of MP from the SADF-treated group was significantly higher than that from the NSADF-treated group at the same dosage, suggesting that EOs in SADF improved the WHC through antioxidation. EOs in SADF prevented the attack of hydroxyl radicals on MP, increasing the β-sheet level and decreasing the random coil level, which was supported by the results of FT-IR, carbonyl content, and sulfhydryl content. Limonene and anisaldehyde present in EOs played an antioxidant role, and anisaldehyde could scavenge free radicals through demethoxylation.
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ANALYTICA CHIMICA ACTA
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2022
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IF 6.911
Ruihua Huang,Ke Zhang,Haowei Sun,Dafeng Zhang,Jian Zhu,Shuxing Zhou,Wenyan Li,Yongtao Li,Chunqiong Wang,Xiuxiu Jia,Thomas Wågberg,Guangzhi Hu
In this study, cetyltrimethylammonium bromide and zeolitic imidazolate framework-8 (ZIF-8) were first assembled via the chemical co-precipitation, and high-quality carbon-based metal-free nanomaterials were synthesized using a heat-treatment process. The internal and morphological characteristics of hexagonal Star ZIF-8 were investigated using scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrochemical sensor with a good response to Cd(II) was prepared via square-wave anodic stripping voltammetry (SWASV) with Star ZIF-8 nanomaterial-modified glassy carbon electrodes. The main parameters were adjusted to obtain the optimal stripping response and a wide linear range. Concurrently, under the calculation of SWASV, the sensitivity of Star ZIF-8-Nafion/GCE to Cd(II) was increased by five orders of magnitude (0.5–230 μg/L), and the determination level was even low to 0.48 μg/L. Based on the high anti-interference ability and stability of the sensor, the application potential of Star ZIF-8 carbon-based metal-free nanomaterials for the detection of trace Cd(II) in was confirmed.
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MACROMOLECULES
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2010
·
IF 4.539
Zhizhang Guo,Xingyu Chen,Jianyu Xin,Duo Wu,Jianshu Li,Chenlong Xu
The influence of molecular weight and arm number of star polymers on the buildup and pH-dependent morphology changes of multilayer films assembled from star poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA) and linear poly(styrenesulfonate) (PSS) was systematically investigated. Well-defined star PDMAEMA, consisting of β-cyclodextrin (CD) core and different arm number (21, 14, and 7) were successfully synthesized via atom transfer radical polymerization (ATRP). It is found that star polymers with certain arm number deposit more mass with the increase of molecular weight. As for the star polymers with almost the same arm length but different arm number, film assembled from 14-arm star PDMAEMA exhibits the fastest growth and the most significant morphology changes upon the pH 2.75 treatment. It is assumed that the interdiffusion of PSS controlled by star PDMAEMA with different structures should be responsible for the different buildup and pH-dependent morphology changes of the multilayer films.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
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2026
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IF 8.8
Silei Zhang,Qingbo Huang,Xiangmin Kuang,Chaofan Guo,Yongli Jiang,Fujie Zhang,Daihong Pan,Ming Du,Sakamon Devahastin,Junjie Yi
Blanching is widely applied as a pretreatment for drying star anise, yet how different pretreatment routes regulate enzyme activity, tissue structure, and final quality remains insufficiently clarified. Here, hot-water blanching (HB), alkaline blanching (AB), radio-frequency treatment (RF), high pressure processing (HPP), and alkaline-assisted HPP (AHPP) were comparatively evaluated, with freezing incorporated as a non-thermal pretreatment option. Drying behavior, water-state redistribution, color development, enzyme activities, bioactive compounds, and aroma-related attributes were assessed to elucidate structure-function relationships. Freezing-assisted pretreatments provided the most consistent improvement in dehydration, reducing the overall drying time from ∼19 h (untreated) to 13–15 h and markedly decreasing residual bound/immobilized water after drying. AHPP resulted in the highest essential oil yield (1.92-fold), while freezing combined with HPP produced the highest redness parameter ( a ⁎ = 14.96), closer to market-typical coloration. Although HB fully inactivated PPO and POD, it led to substantial color deterioration. Total phenolic and flavonoid contents decreased significantly after AHPP ( p < 0.05 ), likely due to enhanced diffusion/leaching losses. Overall, the results indicate that pretreatments modulate enzyme activities and quality primarily through controlled structural alteration, and freezing-assisted strategies offer a practical route to improve drying efficiency while tuning key quality attributes of dried star anise.
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Pharmaceutics
·
2021
·Vol. 14
·期 1
·52
·
IF 6.321
Huikang Yang,Nianhua Wang,Ruimeng Yang,Liming Zhang,Xinqing Jiang
β-cyclodextrin(βCD)-based star polymers have attracted much interest because of their unique structures and potential biomedical and biological applications. Herein, a well-defined folic acid (FA)-conjugated and disulfide bond-linked star polymer ((FA-Dex-SS)-βCD-(PCL)14) was synthesized via a couple reaction betweenβCD-based 14 arms poly(ε-caprolactone) (βCD-(PCL)14) and disulfide-containing α-alkyne dextran (alkyne-SS-Dex), and acted as theranostic nanoparticles for tumor-targeted MRI and chemotherapy. Theranostic nanoparticles were obtained by loading doxorubicin (DOX), and superparamagnetic iron oxide (SPIO) particles were loaded into the star polymer nanoparticles to obtain ((FA-Dex-SS)-βCD-(PCL)14@DOX-SPIO) theranostic nanoparticles. In vitro drug release studies showed that approximately 100% of the DOX was released from disulfide bond-linked theranostic nanoparticles within 24 h under a reducing environment in the presence of 10.0 mM GSH. DOX and SPIO could be delivered into HepG2 cells efficiently, owing to the folate receptor-mediated endocytosis process of the nanoparticles and glutathione (GSH), which triggered disulfide-bonds cleaving. Moreover, (FA-Dex-SS)-βCD-(PCL)14@DOX-SPIO showed strong MRI contrast enhancement properties. In conclusion, folic acid-decorated reduction-sensitive star polymeric nanoparticles are a potential theranostic nanoparticle candidate for tumor-targeted MRI and chemotherapy.Keywords:star polymer;β-cyclodextrin;tumor-targeted;disulfide bond;theranostic nanoparticles
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POLYMER BULLETIN
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2015
·Vol. 73
·期 1
·97-112
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IF 1.438
Teng Lijing,Nie Wangyan,Zhou Yifeng,Chen Pengpeng
In this paper, a series of star-shaped poly( l -lactide)s (s-PLLA) were synthesized via ring-opening polymerization of l -lactide (LLA) using erythritol as initiator. The structure and properties of s-PLLA were characterized by 1 H NMR, GPC and DSC. Then taking rifampicin (RIF) as the model drug, RIF-loaded s-PLLA microspheres were prepared using an oil-in-water emulsion solvent evaporation method. SEM and size analysis indicated that s-PLLA with high monomer/initiator molar ratios (s-PLLA98 and s-PLLA99) could form regular microspheres with smooth surface and have narrow size distributions, which hold the drugs well. The XRD spectra of the RIF-loaded microspheres demonstrated that s-PLLA and RIF were both in their amorphous state after the encapsulation process, which might be caused by the impediment effect of each other. The in vitro release profiles of the RIF-loaded microspheres showed that the s-PLLA99 microspheres were able to sustain the release of RIF for a considerable period of time (70–80 % within 180 h) and the release profiles of RIF from s-PLLA microspheres followed the Baker–Lonsdale model equation. Therefore, these biodegradable and biocompatible s-PLLA microspheres may find practical applications as drug delivery carriers.
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PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Lijian Liu,Haihua Wang,Xixi Hao,Qinghua Zhang,Guiqiang Fei,Yihao Duan,Liyu Sun
Durable superhydrophobic coating has become frequently investigated and reported, however, achieving concurrent mechanical robustness, long-term anti-corrosive and anti-fouling functionalities remains a formidable challenge. In this study, a polymer nanocomposite coating was created through the star crosslinking of polyhedral oligomeric silsesquioxane (POSS) and fluorinated polyimide (FPI) prepolymer. Subsequently, a superhydrophobic bilayer was created by using the aforementioned coating as base coating, hydrophobic polyolefin (POA) with high toughness and strong adhesive was selected to binder fluoride-modified SiO 2 nanoparticles (F-SiO 2 ) to construct robust superhydrophobic topcoat and simultaneously enhance the interfacial bonding between topcoat and base coating. Notably, the bilayer superhydrophobic coating exhibited robust mechanical durability, retaining its superhydrophobicity even after 100 cycles of sandpaper friction and 80 cycles of tape peeling. After a 50-day salt spray test, the superhydrophobic FPI/POSS@POA/F-SiO 2 bilayer coating demonstrated exemplary corrosion resistance, the low frequency impedance modulus (|Z| 0.01Hz ) was still as high as 7.04 × 10 10 Ω·cm 2 , which is one order of magnitude higher than that of FPI/POSS-4 coating (3.17 × 10 9 Ω·cm 2 ) and three orders of magnitude higher than pure FPI coating (1.82 × 10 7 Ω·cm 2 ). In addition, the superhydrophobic coating also demonstrated self-cleaning and anti-fouling properties. The enhanced comprehensive performance for the superhydrophobic FPI/POSS@POA/F-SiO 2 bilayer coating can be ascribed to the improved compactness and physical barrier resulted from the POSS star crosslinking, as well as the strong inhibitory effect endowed by the robust superhydrophobic surface. This study offers a fresh perspective on the preparation of superhydrophobic bilayer coatings with outstanding long-term anti-corrosive and anti-fouling attributes, showcasing their potential and prospective practical applications.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2026
·
IF 7.1
Silei Zhang,Qingbo Huang,Xiangmin Kuang,Chaofan Guo,Yongli Jiang,Fujie Zhang,Sakamon Devahastin,Junjie Yi
Oxidative polymerization of catechins drove the green-to-brown color transition. • Electrolyzed water with ultrasound improved drying efficiency and flavor retention. • More extensive cellular disruption contributed to accelerated moisture migration. • Color, aroma, and moisture changes closely reflected quality changes during drying. • Artificial neural network most accurately predicted moisture and catechin contents. Color is critical determinant of market grade and commercial value of star anise ( Illicium verum Hook. f.). However, mechanisms underlying its characteristic green-to-reddish-brown transformation during processing remain insufficiently understood. The present study investigated color evolution of star anise by comparing ultrasound-assisted electrolyzed water treatment (UEWT) with conventional hot-water blanching (HWB) using framework combining drying kinetics, E-nose, LF-NMR, untargeted LC-MS data as well as machine learning modeling. UEWT significantly enhanced drying efficiency, shortening drying time to 8 h compared to 13 h in case of HWB. LF-NMR spectra revealed that UEWT maintained distinct water mobility profiles, effectively reducing internal mass transfer resistance. UEWT also intensified the chromatic transition, as evidenced by a decline in L* , rapid increases in a* and BI, a greater Δ E , an overall decrease in H , and higher late-stage C* values than those observed under HWB. Catechin depletion, accompanied by formation of oligomeric oxidation products, represents key transformation pathway associated with color development. Among the evaluated machine learning models, ANN-based model exhibited superior performance, achieving high prediction accuracy for both moisture content ( R 2 > 0.98) and catechin content ( R 2 > 0.92). These findings provide new insights into physicochemical basis of color formation and offer practical strategy for real-time quality control during industrial drying of aromatic crops. Download: Download high-res image (294KB) Download: Download full-size image
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Chemistry-An Asian Journal
·
2016
·Vol. 11
·期 18
·2555-2563
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IF 4.592
Yafei Wang,Wanhui Liu,Jiyong Deng,Guohua Xie,Yuanwei Liao,Zuoming Qu,Hua Tan,Yu Liu,Weiguo Zhu
Pi-conjugated organic molecules featuring the donor–bridge–acceptor (D–π–A) structure have been widely used in semiconducting materials owing to their rigid structure, good thermal stability, excellent charge transfer, and high emission efficiency. To investigate the effect of the D–π–A molecular structure on the photophysical properties, in this contribution, three star-shaped D–π–A isomers based on the 2,4,6-triphenyl-1,3,5-triazine, spirofluorene, and triphenylamine moieties, that is, p -TFTPA, mp -TFTPA, and m -TFTPA, were synthesized by elaborately engineering the interconnecting position in the building-block units. The optophysical properties of these compounds were systematically explored by experiments and theory calculations. Definitively, changing the interconnecting position in these molecules played a significant role in the degree of π conjugation, which resulted in tunable emission colors from deep blue to green. Moreover, these isomers were employed as emissive dopants in organic light-emitting diodes. The highest external quantum efficiency of 2.3 % and current efficiency of 6.2 cd A −1 were achieved by using the p -TFTPA based device. This research demonstrates a feasible way to realize blue emitters by engineering D–π–A conjugation.
研究领域:
材料科学
·
光学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 11
·8769-8780
·
IF 3.741
Tao Li,Fang Luo,Xudong Fu,Lanxin Li,Jiayuan Min,Rong Zhang,Shengfei Hu,Feng Zhao,Xiao Li,Yanhua Zhang,Xujin Bao,Qingting Liu
Summary Star copolymers with good film-forming and mechanical properties were in situ synthesized for fabricating proton exchange membranes. The monomers of 3,4-diaminobenzoic acid were first grafted onto glycidyl-polyhedral oligomeric silsesquioxane (G-POSS) cores and then propagated to the poly(2,5-benzimidazole) (ABPBI) chains. The introduction of the star copolymer improves the movement of the ABPBI polymer chains, resulting in a lower internal viscosity and larger free volume that favor increased membrane flatness and absorbilities of water and phosphoric acid molecules, respectively. It was found that the star copolymers with 1.0 wt% of incorporated POSS (ABPBI-1.0POSS) had the best balance of the acid retentivity and film-forming property as well as mechanical properties that are desirable for proton exchange membranes without PA loss operating at high temperatures. The enhanced cell performance characteristics obtained using the ABPBI-1.0POSS-based membranes indicate that star copolymers are promising materials for use in high-temperature proton exchange membrane fuel cells.
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危险品化学品经营许可证（带存储）