Polymers
·
2019
·Vol. 11
·期 7
·1152
·
IF 3.164
Huiqin Zhang,Pan Liu,Zheng Chi,Xuegang Chen
Hydrophilic copolymers containing 2,2′:6′,2″-terpyridine moieties and acrylic acid (AA) units poly (acrylic acid-co-4-(2,2′:6′,2″-terpyridin-4′-yl)styrene) (P(AA-co-TPY)) were synthesized and characterized. Coordinated with different transition metal ions, the dilute aqueous solution of the copolymers exhibited red-shifted UV-vis absorption peaks of π-π* transition from 317 to 340 nm. Further, interacting with iron ions, the copolymer showed new absorption peaks at a longer wavelength region (570 nm) and the absorption intensity enhanced with increase of the ion concentration. When enough ions were added to coordinate with the 2,2′:6′,2″-terpyridine moieties, novel metallo-supramolecular hydrogels were obtained due to the formation of metal coordination bonds between polymer back bones and transition metal ions (Ni2+, Zn2+, Cd2+, Fe2+and Cu2+), which acted as self-assembly crosslinking structures. The mechanical strength and morphology of the resulting metallo-supramolecular hydrogels have been investigated.Keywords:terpyridine;hydrophilic polymer;metallo-supramolecular;hydrogels
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 5
·4204-4210
·
IF 1.798
Huang Xuechen,Zhang Wenqin,Xie Juan,Xu Qi,Zhang Lin,Hao Hua,Liu Hanxing,Cao Minghe
Nb 2 O 5 doped 0.8BaTiO 3 –0.2(Na 1/4 Bi 3/4 )(Mg 1/4 Ti 3/4 )O 3 (0.8BT–0.2NBMT) polycrystalline ceramics were prepared by solid state reaction method. 0.8BT–0.2NBMT samples were observed to possess two dielectric peaks, which were attributed to the formation of core–shell structure (Huang et al. in J Eur Ceram Soc 36:533–540, 2015 ). Longer sintering induced uniform distributions of the additives. The introduction of Nb 2 O 5 into 0.8BT–0.2NBMT could obviously bring about the improvement of the dielectric temperature stability, the degradation of the dielectric loss at room temperature and the decrease of the sintering temperature. The 0.8BT–0.2NBMT ceramics doped with 2.0 at% Nb 2 O 5 could satisfy the temperature range of the X9R (−55 to 200 °C, △C/C 25°C = ±15% or less) characteristics, with a moderate dielectric constant of 1130, low dielectric loss of 0.7%, low sintering temperature of 1050 °C and insulation resistivity of 5 × 10 12 Ω cm at room temperature, which might be promising for practical use in multilayer ceramic capacitors. The inhomogeneous distribution and the existence of the secondary phases were responsible for this excellent dielectric temperature characteristic. The complex impedance analysis was introduced to elaborate the conduction mechanism.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 9
·2319-2327
·
IF 3.125
Chen Yanrong,Wang Kan,Liu Zongrui,Sun Rongjin,Cui Daxiang,He Jinghua
Rapid and quantitative detection of biomarkers with high sensitivity and specificity has become a common practice in the clinical diagnosis and treatment of cancer. Herein, a quantitative lateral flow immunoassay (LFIA) based on superparamagnetic nanoparticles (SPMNPs) was developed for detection of carbohydrate antigen 72-4 (CA72-4) in human serum. This direct and rapid method did not involve any sample preparation and was accomplished using a test strip in which a sandwich reaction was performed. Probes on the conjugate pad were prepared by coupling monoclonal antibody CC49 specific to CA72-4 onto SPMNPs. Coupled monoclonal antibody B72.3 and goat anti-mouse IgG were loaded onto a nitrocellulose (NC) membrane, serving as the test and control lines, respectively. Initially, results were evaluated by macroscopic observation. Afterwards, the magnetic signal strength of the reaction area was quantified using a magnetic assay reader (MAR). Several parameters that may influence the detection sensitivity were studied and optimized. Under optimal conditions, the proposed method was capable of detecting as low as 0.38 IU/mL of CA72-4 in 20 min and had a wide detection linearity range (0–100 IU/mL). We evaluated 100 clinical samples (70 positive and 30 negative) to assess the validity of these test strips, which exhibited high sensitivity (99 %) and specificity (97 %). The results indicated a high rate of accuracy (98.4–102 %) and a low relative standard deviation according to the average recovery test. In conclusion, the test strips based on SPMNP probes are a rapid, sensitive, and quantitative method for the detection of CA72-4 and possess great potential in point-of-care testing (POCT).
Schematic illustration of the strategy for CA72-4 detection and quantification using a superparamagnetic immunochromatographic strip
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POLYMER INTERNATIONAL
·
2013
·Vol. 62
·期 9
·1358-1367
·
IF 2.125
Gang Zhang,Dong-ting Bai,Dong-sheng Li,Sheng-ru Long,Xiao-jun Wang,Jie Yang
Two kinds of monomers containing thioether units 4,6-bis(4-chloroformylphenylthio)pyrimidine (BPPM-DC) and 3,6-bis(4-chloroformylphenylthio)pyridazine (BPPD-DC) were synthesized by two steps and were reacted with diamine-containing thioether (−S–) and sulfone units to prepare a kind of polyamide containing heterocycles and high contents of thioether groups. These polyamides had good optical properties, including an optical transmittance of the aromatic polyamide film at 450 nm that was higher than 87%. Additionally, the pyridazine, pyrimidine and the large quantity of thioether units provided the polymers with high refractive indices of 1.722–1.732 and low birefringences of 0.004–0.006. These polyamides were also found to have good thermal properties. They showed improved solubility in polar aprotic solvents and could form tough films with a tensile strength of 79.2–112.3 MPa and a storage modulus of 1.4–2.4 GPa (at 200 °C).© 2013 Society of Chemical Industry
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JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH
·
2025
·
IF 1.3
Ning Li,Xing-Long Dai,Gui-Xin Xiong,Wan-Li Meng,Jie Hao,Jie-Jie Hao
N-(4-Guanidinobutyl)-2-(4-hydroxyphenyl)-2-oxoacetamide (C1), a marine-derived leonurine analogue, was synthesized via a six-step route with 38% total yield. Biological evaluation demonstrated potent anticoagulant activity through significant prolongation of APTT (20 mM) and PT (5 mM). C1 dose-dependently (100–200 μM) suppressed LPS-induced NO production in RAW 264.7 macrophages without cytotoxicity and modulated phagocytosis. In LPS-induced acute lung injury rats, C1 reduced proinflammatory cytokines in BALF. These findings highlight C1’s dual anticoagulant and anti-inflammatory properties as a promising lead compound.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 15
·5801-5809
·
IF 4.569
Yuan Yuan,Yuangang Xu,Qiang Xie,Dongxue Li,Qiuhan Lin,Pengcheng Wang,Ming Lu
A series of cyclo-N5−-based lead-containing energetic coordination polymers [Pb(OH)]4(N5)4 (1), [Pb3(N5)3(H2O)9(NO3)]4(N5)8(H2O)5 (2), [Pb(OH)]4(N5)3(NO3)(H2O)3 (3), and [Pb(OH)]4(N5)3(ClO4)(H2O) (4) were synthesized by self-assembly and characterized by single-crystal X-ray diffraction, powder X-ray diffraction, infrared and Raman spectroscopy, high resolution mass spectrometry, elemental analysis, scanning electron microscopy, and differential scanning calorimetry. In addition, their thermal decomposition kinetics have been studied theoretically and experimentally. The results revealed that the synthesized CPs possess regular structures, very high densities (2.852–4.537 g cm−3), good oxygen balances (CO2) (−2.72–+2.61%), good thermal stabilities (80–110 °C), and acceptable sensitivities (9.5–20 J; 120–240 N). This work will provide new inspiration for the development of cyclo-N5−-based coordination polymers and energetic materials.
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HIGH PERFORMANCE POLYMERS
·
2023
·
IF 2.1
Jinshui Lu,Jinyuan Zhang,Heng Liu,Weipeng Chen,Jiangrong Luo,Ziqing Wang,Tingting Cui,Yonggang Min,Yidong Liu
In this work, a new diamine was designed by connecting flexible structures such as ether bond and aliphatic carbon chain between benzene rings, and was synthesized and purified through simple reactions such as Suzuki reaction. Finally, a series of polyimide (PI) films were synthesized by copolymerization with 4.4`-diaminodiphenyl ether (ODA)\pyromellitic dianhydride (PMDA) in different proportions. We prepared polyimide films with new monomer copolymerization ratios of 1% (PI-1), 5% (PI-2), 10% (PI-3), and 20% (PI-4). The polyimide films showed excellent glass transition temperatures, which were attributed to their unique bent architectures. The mechanical and thermal properties of the thermosets were studied using tensile testing, static thermomechanical analysis (TMA), and thermogravimetric analysis (TGA). As the results, the films exhibited the optimal glass transition temperatures (317.56°C–381.91°C), and the component with the highest copolymerization ratio has a 15% decrease in glass transition temperature compared to the component without copolymerization. Moreover, PI-1-PI-4 showed good heat resistance in the N2 atmosphere. The temperatures corresponding to a 5% heat loss in the films (T5%) were 458.12 °C–548.75°C, respectively.
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JOURNAL OF CHEMICAL SCIENCES
·
2020
·Vol. 132
·期 1
·1-14
·
IF 1.406
Cheng Si Yuan,Yang Xi Nan,Tao Zhu,Wei Lian Tong,Zhao Wei Wei,Jiang Dao Fa,Jin Yan Mei,Gao Jie,Ma Pei Hua
Abstract The host–guest binding characteristics of cyclopentanocucurbit[6]uril (CyP 6 Q[6]) and cyanine dye trans -4-[4-(dimethylamino)styryl]-1-methylpyridinium iodide ( t -DSMI) have been studied. The results show that CyP 6 Q[6] and t -DSMI form a 1:1 inclusion system, generating strong fluorescence. On this basis, the fluorescent probe t -DSMI@CyP 6 Q[6] has been constructed, and its anion recognition ability has been investigated. In a neutral environment, BF 4 − , H 2 PO 4 − , and I − elicit obvious specific responses from the probe, since they have stronger binding forces. This probe shows greater sensitivity than the previously reported probe t -DSMI@HMeQ[6]. Graphic abstract Since the complex formed by CyP 6 Q[6] and t -DSMI can produce strong fluorescence at pH > 4.6, t -DSMI@CyP 6 Q[6] was constructed to recognize the anions at pH ≅ 5. The results show that in a near neutral environment, BF 4 − , H 2 PO 4 − , and I − elicit obvious specific responses from the probe.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2014
·Vol. 302
·期 1
·123-130
·
IF 1.415
Sun Zhi-Zhong,Wei Hong-Yuan,Wang Guan-Quan,Zhou Zhi-Jun,He Jia-Heng,Wang Jing,Luo Shun-Zhong
[ 131 I]-5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin and [ 131 I]-5-(4-aminophenyl)-10,15,20-triphenylporphyrin ( 131 I-TPPOH and 131 I-TPPNH 2 ) were prepared and their biodistribution properties were evaluated in normal Kunming (KM) mice and SMMC-7721 tumor-bearing BALB/c mice. The optimized labeling yields were 98 and 96 % for 131 I-TPPOH and 131 I-TPPNH 2 , respectively. They were stable in vitro saline and in vivo. Both compounds had a specific affinity to liver and lung, and mainly metabolized through liver. They showed a time-dependent accumulation and retainable characteristics in SMMC-7721 tumor. These results supported their potential value for targeted tumor therapy agents.
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Inorganic Chemistry Frontiers
·
2023
·Vol. 11
·期 1
·107-113
·
IF 7
Zihao Yu,Qingran Ding,Yuhang Jiang,Weiqi Huang,Changsheng Yang,Sangen Zhao,Junhua Luo
The research on nonlinear optical (NLO) crystals is mainly focused on two relatively separate systems, π-conjugated or non-π-conjugated systems, respectively. In this work, we report a new NLO crystal Na10Zn(NO3)4(SO3S)4 combining inorganic π-conjugated [NO3] and non-π-conjugated heteroanion [S2O3] groups, which was synthesized by the aqueous solution method. In the structure, the similar coexistence of planar triangular anionic groups (π-conjugated) and heteroanion tetrahedra (non-π-conjugated) is rarely mentioned, which provides a new approach for designing NLO crystals. Notably, this compound exhibits a phase-matching second-harmonic generation (SHG) response 1.2 times that of KH2PO4. In addition, birefringence, absorption edge and theoretical calculations are also reported in this article. This work provides a new designing route to expand NLO systems via combining planar π-conjugated and non-π-conjugated heteroanion groups.
研究领域:
材料科学
·
光学材料
·
晶体化学
·
非线性光学
·
功能材料
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FOOD HYDROCOLLOIDS
·
2026
·
IF 13.8
Yongpeng Yin,Jianing Cai,Yingzhi He,Kun Huang,Xiner Ning,Shan Sun,Dingding Li,Beiwei Zhu,Xiaoming Guo
Gum arabic (GA), as a natural emulsifier, has been broadly applied in the food industry. However, it suffers from issues such as high dosage requirements and poor emulsion stability. This study aims to prepare amide-modified GA (M-GA) by inducing endogenous amidation crosslinking in GA using 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholine chloride (MMTM). Subsequently, the emulsification mechanism of M-GA was thoroughly investigated from structural and interfacial perspectives. The results indicate that crosslinking treatment extended the molecular chains of M-GA, forming larger ellipsoidal aggregates with higher molecular weight (1.27×10 6 g/mol) and surface hydrophobicity compared to control GA (C-GA). In terms of interfacial properties, although high molecular weight M-GA adsorbed more slowly at the oil-water interface, it can form a film with higher interfacial concentration, effectively inhibiting droplet coalescence. Furthermore, the emulsions stabilized by M-GA exhibited superior emulsification stability and pH stability. These findings confirm that endogenous amidation crosslinking can enhance the emulsifying stability of GA and decrease the emulsifier dosage, offering a novel approach for developing high-performance emulsifiers.
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LANGMUIR
·
2026
·
IF 4.4
Zhengqiu Chen,Junyu Chen,Huaming Mao,Jungang Yin,Yu Ren,Wei Dai,Shuanglong Zhao,Hongwei Yang
Although the preparation of silver nanosheets (AgNSs) through diverse methods has largely advanced over the past few decades, the simple and efficient synthesis of high-quality AgNSs under mild conditions remains challenging. Herein, we report a strategy for preparing rounded and sharp-cornered AgNSs with uniform thicknesses of 30–40 nm via simple liquid-phase reduction. Structural characterization revealed that the reduction reaction rate was mediated by coordination of silver ions with the amino groups of gelatins and the carboxylate ions of glutaric acid (GA), effectively suppressing burst nucleation. Density functional theory calculations further identified the adsorption preference of GA anions on Ag(111) as the key factor that dictates the anisotropic growth of silver nanosheets. Furthermore, selective etching with hydrogen peroxide (H2O2) mediates the morphological evolution of AgNSs from rounded to sharp-cornered morphologies, effectively removing byproduct particles to achieve sharp-cornered AgNSs in yields exceeding 90%. Catalytic performance testing of the hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) indicates that the mass-normalized rate constants reached 156.67 and 154.22 s–1 g–1 for the rounded and sharp-cornered AgNSs, respectively. The conversion rate of 4-NP decreased by only about 2% after five consecutive catalytic cycles. This work provides guidelines for the efficient, economical, and green synthesis of two-dimensional metal nanomaterials while offering valuable insights into the application of the AgNSs in the catalytic reduction of 4-nitrophenol.
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