POLYMER
·
2017
·
IF 3.684
Jia-Min Li,Chuan-Shan Hu,Jian-Ming Shao,Hui-Juan Li,Peng-Yun Li,Xi-Chuan Li,Wei-Dong He
Ternary hydrogels composed of poly[acrylamide- co -2-(dimethylamino)ethyl methacrylate] [P(AM- co -DMAEMA)], poly(vinyl alcohol) (PVA) and β -cyclodextrin ( β -CD) were fabricated based on the multiple physical interactions such as inclusion complexation, hydrogen bonding and polymer crystallinity , and exhibited high storage modulus . To illustrate the individual role of each physical interaction, symmetrical investigation has been performed. P(AM- co -DMAEMA)s with two compositions , prepared by radical polymerization at −20 °C below the freezing point of reaction medium of water, were served as the inclusion guest for the inclusion host of β -CD. The inclusion complex between dimethylaminoethyl group of DMAEMA and β -CD was identified through 2D NOESY NMR spectroscopy . Hydrogen bonding between each pairs of hydrogel components was confirmed with FTIR analysis and contributed the second form of crosslinkage. Under freezing polymerization and further freezing-thawing treatment, PVA component tended to crystallize to serve as the third type of physical crosslinkage, which was recognized with X-ray diffraction. Rheological and thermo-gravimetrical analysis was used to inspect the modulus and thermal stability of the hydrogels, respectively. Three hydrogels of P(AM- co -DMAEMA)/PVA-g- β -CD, P(AM- co -DMAEMA)/PVA/ β -CD and P(AM- co -DMAEMA)/PVA were synthesized under the same condition to make the comparison. The whole results disclosed the strong dependence of hydrogel properties on the hydrogel components, reflecting the synergistic effects of different physical crosslinkages for the formation of those physical hydrogels.
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DOI
高影响因子
CHIRALITY
·
2019
·Vol. 32
·期 2
·168-184
·
IF 1.927
Yazhou Shuang,Yuqin Liao,Hui Wang,Yuanxing Wang,Laisheng Li
A triazole-bridged bis (β-cyclodextrin) was synthesized via a high-yield Click Chemistry reaction between 6-azido-β-cyclodextrin and 6-propynylamino-β-cyclodextrin, and then it was bonded onto ordered silica gel SBA-15 to obtain a novel triazole-bridged bis (β-cyclodextrin)–bonded chiral stationary phase (TBCDP). The structures of the bridged cyclodextrin and TBCDP were characterized by the infrared spectroscopy, mass spectrometry, elemental analysis, and thermogravimetric analysis. The chiral performance of TBCDP was evaluated by using chiral pesticides and drugs as probes including triazoles, flavanones, dansyl amino acids and β-blockers. Some effects of the composition in mobile phase and pH value on the enantioseparations were investigated in different modes. The nine triazoles, eight flavanones, and eight dansyl amino acids were successfully resolved on TBCDP under the reversed phase with the resolutions of hexaconazole, 2′-hydroxyflavanone, and dansyl- DL -tyrosine, which were 2.49, 5.40, and 3.25 within 30 minutes, respectively. The ten β-blockers were also separated under the polar organic mode with the resolution of arotinolol reached 1.71. Some related separation mechanisms were discussed preliminary. Compared with the native cyclodextrin stationary phase (CDSP), TBCDP has higher enantioselectivity to separate more analytes, which benefited from the synergistic inclusion ability of the two adjacent cavities and bridging linker of TBCDP, thereby enabling it a promising prospect in chiral drugs and food analysis.
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高影响因子
CATALYSIS COMMUNICATIONS
·
2018
·
IF 3.463
Chengwu Dong,Changlong Yin,Tongtong Wu,Zhuyan Wu,Dong Liu,Chenguang Liu
An unsupported Ni Mo catalyst was modified by β-zeolite nanoclusters synthesized by the hydrothermal method. The effect of the nanoclusters on the acidity of unsupported catalyst was studied. Results showed that the Lewis acid and the total acid amount of the unsupported catalyst were improved. Indicating that the β-zeolite nanoclusters was successfully introduced into the unsupported catalyst. And the catalytic activity results showed that the introduction of β-zeolite nanoclusters not only led to the higher desulphurization and isomerization activity, but also improved the ratio of direct desulfurization paths (DDS), which is in favor of reducing hydrogen consumption.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2013
·
IF 4.612
Xilun Weng,Zongbi Bao,Huabin Xing,Zhiguo Zhang,Qiwei Yang,Baogen Su,Yiwen Yang,Qilong Ren
A cellulose derivative-based chiral stationary phase (CSP) is considered one of the most widely applied CSPs due to its powerful enantioseparation ability. The high loading capacity and mechanical strength of CSPs are crucial for their application in preparative chromatography, such as a simulated moving bed. Compared to traditional cellulose-based CSPs that have been adsorbed onto chromatographic supports, organic–inorganic hybrid CSPs exhibit a potentially higher loading capacity and mechanical strength by increasing the density of chiral recognition groups. A hybrid cellulose 3,5-dimethylphenylcarbamate chiral stationary phase (organic/inorganic: 70/30, w/w) was prepared via a sol–gel method and characterized with several analytical techniques, including Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and 29 Si cross polarization/magic angle spinning nuclear magnetic resonance ( 29 Si CP/MAS NMR). In addition, the as-synthesized hybrid chiral silica spheres were treated with an end-capping process to mask the residual silica hydroxyl groups. Compared to a commercial Chiralpak IB column, better separation of β-blocker drugs, including pindolol (selectivity of 5.55), metoprolol (2.30), propranolol (1.96), bisoprolol (1.74) and atenolol (1.46), on the end-capped CSP was achieved using liquid chromatography, which suggests that the packing material synthesized in this work has sufficient chiral discriminating ability for the effective separation of β-blocker drugs.
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DOI
高影响因子
Materials Advances
·
2023
·Vol. 4
·期 21
·5215-5223
·
IF 5
Dong-Xue Xia,Li-Wen Fan,Ming-Fu Ye,Wen-Qi Sun,Rui-Lian Lin,Jing-Xin Liu
Three distinct viologen derivatives have been designed and successfully synthesized. They have been shown to form 1 : 1 or 2 : 1 host–guest inclusion complexes with β-cyclodextrin (β-CD) in aqueous solution. In comparison with the traditional N-alkyl-substituted viologen, the inclusion complexes of the conjugation-extended viologens with β-CD exhibit interesting bathochromic-shifted photochromic behaviors in the solid state, which have been characterized by UV-vis diffuse-reflectance and electron-spin resonance (ESR) spectroscopy. Owing to the bathochromic-shift effect, the photoproducts of these three inclusion complexes undergo significant color changes from blue to green and then to orange. In addition, these three inclusion complexes display interesting photomodulable fluorescence emissions. The excellent photochromic and fluorescence properties of these three inclusion complexes endow them with potential applications in protection, erasable inkless multi-color printing, multiple anti-counterfeiting and multilevel information encryption, which have also been extensively demonstrated in this work.
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DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2013
·Vol. 21
·期 7
·726-731
·
IF 1.639
Huang Hui,Fan Yifan,Wang Junwei,Gao Haoqi,Tao Shiying
A water-insoluble β -cyclodextrin ( β -CD) polymer was synthesized by reacting β -CD with hexamethylene diisocyanate, and its adsorption kinetics and thermodynamics for phenol from aqueous solution was investigated. The kinetics of adsorption followed the pseudo-second-order model and the adsorption isotherms could be well fitted by the Freundlich adsorption equation. The values of thermodynamic parameters demonstrated that the adsorption was a physisorption in a spontaneous and exothermic process.
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 1
·017507
·
IF 3.9
Juanjuan Hu,Xuyuan Chen,Jun Xu,Xiaoying Wang
Amyloid-β oligomers (AβOs) play an important role in Alzheimer's disease (AD), and have attracted wide attention as a significant and promising biomarker. Currently, triple-helix aptamer probe (TAP) has yet to fully capture people's eyes. The previous studies in our group have proved that TAP is an effective alternative to traditional sandwiches or direct detection strategies. Nevertheless, these developed "signal off" sensors suffered from complex nanomaterial preparation procedures and possibility of false positives. Herein, we successfully constructed a signal-enhanced regenerative electrochemical aptasensor (EA) based on TAP strategy to realize reliable assay for AβOs, subtly keeping off false positive responses. In this work, ferrocene (Fc)-labeled complementary strand (CS) (Fc-CS) acted as a signal label, avoiding the need for complex nanomaterials. Fc-CS hybridized with label-free aptamer (Apt) to form TAP on Au electrode (AE). The formation and destruction of TAP structure could adjust the weak and strong DPV signal. Thus, sensitive electrochemical detection for AβOs was achieved with and a low detection limit of 0.47 fM. Moreover, the EA could exhibit outstanding selectivity, specificity, stability, reproducibility and regenerability. Meanwhile, it can be applied to the determination of artificial cerebrospinal fluid (A-CSF) samples, providing a convenient and low consumption platform for practical applications.
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Guangyang Liu,Lingyun Li,Donghui Xu,Xiaodong Huang,Xiaomin Xu,Shuning Zheng,Yanguo Zhang,Huan Lin
A novel magnetic copper-based metal–organic framework (M-MOF) was prepared using a Fe 4 O 3 –graphene oxide (GO)–β-cyclodextrin (β-CD) nanocomposite as the magnetic core and support, and used for adsorption and removal of neonicotinoid insecticide pollutants from aqueous solution. M-MOF characterization suggested that 1 Fe 4 O 3 –GO–β-CD consisted of a thin single layer with anchored Fe 3 O 4 . The M-MOF was coated on the Fe 4 O 3 –GO–β-CD surface. The M-MOF had a large Brunauer–Emmett–Teller surface area (250.33 m 2 g −1) and high super-paramagnetism with saturation magnetization of 10.47 emu g −1 . Adsorption model analysis showed that the equilibrium data for thiacloprid fitted Langmuir monolayer adsorption and the other insecticides tested showed Freundlich bimolecular layer adsorption. The results show that M-MOF is a promising hybrid adsorbent for rapid removal of neonicotinoid insecticide pollutants from environmental waters.
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高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2022
·Vol. 649
·期 4
·e202200279
·
IF 1.414
Shuai-Cong Huo,Yao Li,Peng-Fei Ji,De-Xiang Zhang,Zhi-Jiao Zhang,Ying Yang,Herbert W. Roesky
Treatments of β -diketiminate aluminum dihydride LAlH 2 (L=HC[C(Me)N(Ar)] 2 , Ar=2,6- i Pr 2 C 6 H 3 ) with (2-chlorophenyl)methanol, 2,3-dimethylbutane-2,3-diol, 2,2-dimethylpropane-1,3-diol, 2,2-bis(bromomethyl)propane-1,3-diol, and p -diphenol resulted in the formation of compounds containing the C−O−Al−O−C linkages, including the acyclic LAl[( μ -O)CH 2 ( o -Cl−C 6 H 4 ) 2 ] 2 ( 1 ), the five-membered ring LAl[( μ -O)CMe 2 ] 2 ( 2 ), the six-membered ring LAl[( μ -O)CH 2 ] 2 CMe 2 ( 3 ) and LAl[( μ -O)CH 2 ] 2 C(CH 2 Br) 2 ( 4 ), and the macrocyclic [LAl( μ -O) 2 ( p -C 6 H 4 )] 4 ( 5 ), respectively. These practices prove that β -diketiminate aluminum dihydride is a valuable precursor for the preparation of acyclic and cyclic systems. 1 – 5 were characterized by melting point, 1 H and 13 C NMR, FT-IR, and single-crystal X-ray diffraction studies.
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高影响因子
Inorganic Chemistry Frontiers
·
2016
·Vol. 3
·期 8
·1082-1090
·
IF 4.532
Min Li,Xiaoyang Liu,Li Liu,Bing Ma,Benxian Li,Xudong Zhao,Wenming Tong,Xiaofeng Wang
A series of Yb3+/Tm3+ co-doped β-NaYF4 (β-NaYF4:Yb,Tm) crystals have been successfully synthesized via the molten salt synthesis (MSS) method. A unique strong green emission of Tm3+ was observed, which cannot be obtained by any other method. The red, green and blue (RGB) light emissions have been obtained simultaneously in the presence of a single activator (Tm3+). The influencing factors of crystal growth have been studied in detail, in order to understand the change of the transition probabilities of Tm3+. Subsequent studies indicate that the RGB light emissions of Tm3+ can be effectively tuned by varying the concentration of sensitizers (Yb3+ and Mn2+) and the reaction time. Consequently, the effective multicolor upconversion (UC) luminescence was obtained, especially a strong white light, which was not obtained in the β-NaYF4:Yb,Tm system earlier. To our knowledge, it is the first time that the UC properties in the β-NaYF4:Yb,Tm system have been investigated by altering the transition probabilities at the same energy level of Tm3+.
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高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Yezhou Jiang,Bingchuan Liu,Jikun Xu,Keliang Pan,Huijie Hou,Jingping Hu,Jiakuan Yang
A complex chitosan/β-cyclodextrin polymer was synthesized by bridging with maleoyl chains followed by cross-linking with glutaraldehyde. The adsorption performance of the synthetic polymer was investigated for selective removal of methyl orange (MO) from aqueous solution. The kinetic behavior was well fitted by the pseudo-second order model, while the adsorption process at equilibrium followed the Langmuir isotherm model. The thermodynamic parameters suggested that the adsorption was exothermic and spontaneous. Under optimal adsorption conditions, the capacity for MO reached 392 mg/g with the dosage of 10 mg/50 mL. Based on the analysis from FTIR, 1 H NMR, TGA and zeta potential, the adsorption mechanism could be explained by the synergistic effect of electrostatic attraction of amino groups from chitosan and host-guest interaction from β-cyclodextrin. This adsorbent also demonstrated high selectivity towards MO due to the unique structure of cross-linked chitosan/β-cyclodextrin polymer that are complementary to that of MO molecule.
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高影响因子
Polymer Chemistry
·
2025
·
IF 3.9
Yanqing Feng,Penghui Guo,Jinfang Chu,Wei Ding,Yushun Jin,Ruofan Liu,Yibo Wu
To overcome the environmental and resource constraints of petroleum-based polyisobutylene (PIB), the cationic random copolymerization of isobutylene (IB) with the sustainable and renewable monomer β-pinene (Bp) was systematically investigated using an Al2Et3Cl3/trace water initiation system. Through condition optimization (T = -80 °C, [Al2Et3Cl3] = 1.00×10-2 mol/L, nIB:nBp = 98:2), IB-co-Bp copolymers with high molecular weight (Mn was up to 7.86×104 g/mol) were successfully synthesized. This random copolymer structure and reaction mechanism were elucidated via 1H-NMR and DFT. The structural characteristics, thermal properties and mechanical properties of the copolymer were systematically investigated to clarify its composition-property relationships. More importantly, dynamic mechanical analysis of the vulcanized samples demonstrated that Bp incorporation significantly influenced the copolymer’s viscoelastic behavior and network structure. The vulcanization of IB-co-Bp copolymers was shown to effectively enhance its damping performance, thus providing a novel strategy for high molecular weight bio-based PIB and a sustainable pathway for developing advanced elastomers.
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