Science China-Materials
·
2022
·Vol. 65
·期 9
·2585-2590
·
IF 8.64
Chen Zilong,Zeng Hao,Chu Dongdong,Zhang Fangfang,Cheng Meng,Yang Zhihua,Pan Shilie
A new deep-ultraviolet (DUV) birefringent crystal, LiB 5 O 5 F 2 (OH) 4 (LBOFH), was designed and synthesized by a high-temperature solution method. Its structure features a [B 5 O 5 F 2 (OH) 4 ] anionic group that is constructed by four π-conjugated units, i.e., two [BO 3 ] units and two [BO(OH) 2 ] units connected by the [BO 2 F 2 ] unit, which forms a near-coplanar configuration. The group exhibits large anisotropic polarizability and highest unoccupied molecular orbital-lowest unoccupied molecular orbital (HUMO-LUMO) gap, thus providing a good balance between the large birefringence (0.124 at 546 nm) and band gap (7.99 eV) in LBOFH. This work suggests new possibilities for the design and fabrication of advanced DUV birefringent crystals using the novel anionic group and the expansion of their alternative system with new hydroxyfluorooxoborates.
研究领域:
材料科学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Liang Lai,Mengyao Zhang,Yuexiang Chang,Minyi Li,Jacques Crommen,Jia-Huan Qu,Dongsheng Xu,Zhengjin Jiang
The structure of zwitterion has great impact on the separation properties of zwitterionic hydrophilic stationary phases. To better understand the role of anionic groups of zwitterions, a novel carboxybetaine-based zwitterionic monolithic column was first prepared through thermo-initiated copolymerization of functional monomer (3-acrylamidopropyl)-dimethyl-(2-carboxymethyl) ammonium (CBAA) and crosslinker ethylene dimethacrylate (EDMA) within 100 μm ID capillary. The optimal poly(CBAA- co -EDMA) monolithic column exhibited satisfactory mechanical and chemical stability, good repeatability, high column efficiency (96,000 plates / m), and excellent separation performance for different classes of polar compounds (i.e., phenols, monophosphate nucleotides, urea and allantoin). A comparative study was then performed among three zwitterionic hydrophilic stationary phases containing different anionic groups, i.e. poly(CBAA- co -EDMA) (carboxybetaine), poly(2-{2-(methacryloyloxy) ethyldimethylammonium}ethyl n-butyl phosphate- co -EDMA) (phosphocholine), and poly(N,N-dimethyl-N-(3-methacrylamidopropyl)-N-(3-sulfopropyl) ammonium betaine- co -EDMA) (sulfobetaine) using benzoic acid derivatives, amine compounds, nucleobases and nucleosides as model analytes. The carboxybetaine-based monolithic column exhibited much higher positive zeta-potential and hydrophilicity, which endows it with a stronger retention capacity for acidic and neutral compounds, but sulfobetaine-based monolithic column exhibited much higher selectivity and retention capacity for the amines. Moreover, their enrichment efficiencies for N- glycopeptides were also evaluated based on their different hydrophilicity, and it was observed that the poly(CBAA- co -EDMA) monolithic material captured 4-8 times more N- glycopeptides compared to the other two materials.
研究领域:
分析化学
·
色谱技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE FORUM
·
2016
·
IF 0
Yan Ou Hu,Hui Qin Lian,Lei Zu,Yue Ting Li,Yang Liu,Xiu Guo Cui,Zhong Kai Hu,Yan Hua Jiang,Lei Wang,Yu Peng Liu,Ben Ze Wu
Ionic polyurethane (IPU) was synthesized as shape memory materials. Poly (tetramethylene ether) glycol with 2000g/mol number average molecular weight were used as soft segment, 4,4-methylenebis (phenyl isocyanate), and 1,2-dihydroxy-3-propanesulfonic acid salt were used to compose the segment of SMP materials. The structure and properties of these IPU films were characterized by Fourier Transform infrared, X-ray diffraction, Thermal gravimetric analysis and Differential scanning calorimeter. The results showed that the glass transition temperature of the IPU increased with the increase of hard segment content. The physical properties in terms of swelling property, water absorption and ion-exchange capacity increased with the improving of sulfonic group content in IPU. The shape memory property of IPU exhibited that the shape fixity ratio and recovery rate improved remarkably with the increase of hard segment content.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Mingfu Li,Juan Yin,Lingyu Hu,Siyuan Chen,Douyong Min,Shuangfei Wang,Lianxin Luo
The properties of the chemo-mechanical pulp were determined by the position and quantity of anionic groups in the pulp fibers. In this study, the effects of anion group content and structure in sulfonated mulberry stem chemo-mechanical pulp (SCMP) were investigated during the hydrogen peroxide (H 2 O 2 ) bleaching process. Surface morphology and anion group structure of the pulp fibers were analyzed by scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and gas chromatography-mass spectrometry (GC MS). The results indicate that the sulfonic group content in bleached pulp decreases with the concentration of H 2 O 2 to a minimum content of 71.53 μmol g −1 , which is reduced by 22.68% in comparison to the unbleached pulp content of 92.51 μmol g −1 . The content of carboxyl groups in pulp first increases and then decreases with the concentration of H 2 O 2 . The maximum carboxyl group content is 164.79 μmol g −1 , which is increased by 53.97% compared with unbleached pulp at 107.03 μmol g −1 . The total anion groups content of SCMP first increases and then decreases with the concentration of H 2 O 2 . FTIR and XPS analysis show that the content of anion groups on the surface of the pulp fibers increases slightly after H 2 O 2 bleaching. GC MS analysis demonstrates that the content of uronic acid increases after H 2 O 2 bleaching and the order of increase is 4-O-MeGlcA > GlcA > GalA . The contents of sulfonic acid group, total anion groups (TAGs) and surface anion groups (SAGs) of bleached pulp increase because of the hydroxyl group oxidation , terminal group reduction, methyl esterification of pectin and decomposition of polyxylose, resulting in the formation of new carboxyl groups and more uronic acid. This study reveals the mechanism of the effect of hydrogen peroxide bleaching on the anionic groups in the SCMP pulp, which is conducive to the development of bleaching technology for high yields of mulberry stem pulp.
研究领域:
制浆造纸工程
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SN Applied Sciences
·
2020
·Vol. 2
·期 4
·1-11
·
IF 0
Yu Wenjie,Li Hengye,Zhang Lin,Liu Jing,Kong Fenying,Wang Wei
Abstract Adsorption is a promising technique for water treatment. Porous aromatic frameworks (PAFs) have been witnessed as advanced adsorbents for various applications and PAFs with task-specific functionality and porosity are desirable adsorbents. Herein, a charged PAF, PAF-CH 2 N(CH 3 ) 3 I, was prepared through precursor-designed method. The charged PAF is densely and homogeneously functionalized with cationic groups and featured with hierarchical pore structure. The content of the charged groups in the framework reaches up to 52.27 wt% and the hierarchical structure facilitates fast adsorption/desorption of dye molecular. It demonstrates strong affinity, fast adsorption rate, high adsorption efficiency and high adsorption capacity towards not only small model anionic dye but also large-sized one, which can not be adsorbed efficiently by other microporous adsorbents. In addition, benefiting from the hierarchical structure, the charged PAF can be easily regenerated and reused with almost no loss of its efficiency even after 10 adsorption–desorption cycles. These excellent features demonstrate that the charged PAF is a promising adsorbent for wastewater treatment and this study provides a new perspective to explore functionalized PAFs as a versatile type of advanced adsorbents. Graphic abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
Small
·
2024
·
IF 13
Zequan Huang,Danyi Zhu,Mingjie Ma,Bing Zhao,Jiazhen Liang,Liang Zhang,Chao Chen,Mengjiao Liu,Congjie Gao,Fei Huang,Lixin Xue
The degradation of fixed cationic groups in most anion exchange membranes (AEMs) under alkaline environments limits their durability for alkaline water electrolysis (AWE). Ion-solvating membranes (ISMs) have emerged as a promising alternative to address this issue. Herein, a cationic group-free ion solvating membrane in a free-standing gel form (ISM-PBI-FG) is presented, created through a sol-to-gel transformation process followed by KOH imbibing. This approach yields a 3D porous microstructure composed of entangled polybenzimidazole (PBI) nanofibrils, achieving 89% porosity, which enables ultrahigh alkali uptake (346% in 6 M KOH) and exceptional ionic conductivity (763 mS cm −1 at 80 °C). The absence of cationic groups avoids the attack by OH − , thus ensures good alkaline stability with a conductivity retention rate of 91.6% over a 3120 h ex situ test in 6 M KOH. The resulting membrane delivered outstanding AWE performance with current densities of 5.5 A cm −2 using platinum-group-metal (PGM) catalysts and 2.2 A cm −2 using PGM-free catalysts at 2.0 V. Notably, the in situ electrolyzer device based on ISM-PBI-FG offers extensive operational flexibility ranging from 40–100 °C and demonstrates record durability in concentrated alkaline conditions, with a voltage decay rate of only 23.5µV h −1 , outperforming most reported AEMs and ISMs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Huizhen Zheng,Meng Gao,Ying Ren,Ruyun Lou,Hongguo Xie,Weiting Yu,Xiudong Liu,Xiaojun Ma
The surface properties of implanted materials or devices play critical roles in modulating cell behavior. However, the surface properties usually affect cell behaviors synergetically so that it is still difficult to separately investigate the influence of a single property on cell behavior in practical applications. In this study, alginate–chitosan (AC) microcapsules with a dense or loose gel structure were fabricated to understand the effect of gel structure on cell behavior. Cells preferentially adhered and spread on the loose gel structure microcapsules rather than on the dense ones. The two types of microcapsules exhibited nearly identical surface positive charges, roughness, stiffness, and hydrophilicity; thus, the result suggested that the gel structure was the principal factor affecting cell behavior. X-ray photoelectron spectroscopy analyses demonstrated that the overall percentage of positively charged amino groups was similar on both microcapsules. The different gel structures led to different states and distributions of the positively charged amino groups of chitosan, so we conclude that the loose gel structure facilitated greater cell adhesion and spreading mainly because more protonated amino groups remained unbound and exposed on the surface of these microcapsules.
研究领域:
生物材料学
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Shixin Zhu,Guilan Fu,Xiuhua Sun,Changlu Gao
Cationic copolymers formulated with different weight percentages of random copolymerized amphiphilic poly(carboxybetaine methacrylate ester)-poly(methyl methacrylate)-polyvinylpyrrolidone (PCBMAE–PMMA-PVP) side chain and polycaprolactone (PCL)/siloxane main chain were developed via a one-pot continuous reaction for the preparation of marine antifouling coatings. By tuning the weight percentage of the side chain and main chain, a 30% quaternization degree can be achieved without obvious gelation of the cationic copolymer. The hydrolyzable PCBMAE in the side chain and degradable PCL in the main chain led to the self-replenishment of the coating. Moreover, the surface hydrophilicity of the developed coatings was greatly improved owing to the creation of a zwitterionic group during PCBMAE hydrolysis. Results on the weight loss rate of the coating revealed that the amphiphilic side chains, more specifically, the PCBMAE moiety rather than PCL moiety in the hydrophobic main chain, dominated the surface renewal speed. Therefore, the fouling-resistance and fouling-release abilities of the developed cationic copolymer-based coatings were largely promoted compared with the control samples, which only had a main chain. Additionally, experimental results demonstrated that a higher content of amphiphilic side chains correlated with less protein adsorption, but a higher content of siloxane showed more advantages in antibacterial ability. The antibacterial rate of the developed coatings against Escherichia coli and Staphylococcus aureus ranged from 83 to 95%. The marine field test manifested that the optimized coatings can stand the marine biofouling for four months in the thriving growth season of marine microorganisms.
研究领域:
材料科学
·
海洋生物学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Chunmei Yuan,Xin Zhong,Peishu Tian,Zhe Wang,Guanghui Gao,Lianfeng Duan,Chunsheng Wang,Fengwei Shi
Hydrogel electrolytes have attracted great attention because the properties of integrated conductivity and mechanical flexibility endow them with potential applications in flexible solid-state batteries. However, hydrogels are easy to freeze when the temperature drops below zero, resulting in the reduction of ionic conductivity and mechanical strength of hydrogels. Herein, an antifreezing polymer hydrogel electrolyte was developed by introducing a zwitterionic group and salt into the double-network polymer. The polymer hydrogel electrolyte possessed a perfect ionic conductivity of 10.38 mS cm–1 at −20 °C and could remain unfrozen until −50 °C. A flexible solid-state Zn//LiFePO4 battery assembled with the prepared hydrogel electrolyte exhibited a discharge capacity of 126.1 and 75.1 mAh g–1 at 20 and −20 °C at 1 C, respectively. In addition, it showed quite perfect cycling performance and maintained a capacity retention of 72.6% after 1000 cycles with a favorable Coulombic efficiency (∼100%) at −20 °C at 1 C. The hydrogel electrolyte with perfect antifreezing performance is supposed to broaden the range of working temperature and practical applications of the zinc ion battery.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Meng Cheng,Congcong Jin,Wenqi Jin,Xueling Hou
Borates provide an excellent platform for investigating the optical nonlinearity and linearity of crystals as photoelectric functional materials. In our work, borate derivatives with isolated [B3O3] six-membered rings as structural features are the preferred system due to their simple functional units and excellent properties. Herein, by utilizing the target-oriented synthesis, a series of borate derivatives, A2[B3O3F4(OH)] (A= NH4, Rb, Cs) (ABOFH), K2.3Cs0.7B3O3F6 (KCsBOF), and Cs3[B3O3(OH)3]Cl3 (CsBOHCl), with novel heteroanionic groups containing [BOxF4–x] (x = 0–3) and/or [BO2(OH)] units were obtained. ABOFH, KCsBOF, and CsBOHCl construct different two-dimensional pesudolayers featuring [B3O3F4(OH)], [B3O3F6], and [B3O3(OH)3] units, respectively. Also, the optical properties and the arrangement information of these anionic groups were studied. Among the total five compounds, (NH4)2[B3O3F4(OH)] and Cs3[B3O3(OH)3]Cl3 with enlarged birefringence and sufficient band gaps were screened out as promising birefringent crystals due to the optimally aligned configuration of birefringence-active heteroanionic units. The successful results of target-oriented synthesis indicate a more profound conclusion that the borate system now has more diversified structural chemistry, and an effective strategy was proposed to modify the arrangement and species of anionic units to optimize the performance of optical crystals.
研究领域:
材料科学
·
晶体化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Xiaoyan Yang,Sangen Zhao,Shipeng Geng,Li Yang,Qingzhen Huang,Xiaojun Kuang,Junhua Luo,Xianran Xing
RbNaMgP2O7 is a newly reported nonlinear optical (NLO) crystal that displays remarkable second harmonic generation (SHG) enhancement upon heating. In this work, we carried out in situ neutron powder diffraction and impedance spectroscopy measurements through its polar-to-polar phase-transition region and confirmed that the dynamic process for the alignment of NLO-active anionic [P2O7]4– groups is composed of thermo-induced incremental rotation of [P2O7]4– groups, which is accompanied by cationic migration enhancement. Furthermore, we elucidated a new mechanism of coupling between anionic group alignment and cationic migration for the first time in NLO materials. This mechanism could offer extra freedom for new NLO material design and anionic group alignment control for a better SHG response via tuning the cationic migration.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2024
·
IF 2.2
Shikun Liang,Yunzhan Ying,Xiangwei Xu,Chengbo Qian,Long Jiang,Jing Zhou,Yulong Wan,Lie Wang,Yuyuan Yao
The widespread use of emerging refractory organic contaminants poses a significant threat to human health, prompting the need for a cost-effective and efficient removal strategy. While the iron ions/PMS system effectively removes organic pollutants, slow Fe3+ to Fe2+ transformation hampers its efficiency, and the homogeneous distribution of iron ions complicates separation, resulting in secondary sludge pollution. Herein, we developed a novel submicron Fe-MoS2 (S-Fe-MoS2) catalyst with abundant surface cationic groups and sulfur vacancy through a cationic polyacrylamide aerogels (CPAMA) confined hydrothermal synthesis strategy. These features promote active site exposure, enhance reactant adsorption, and accelerate electron transfer between Mo and Fe sites, improving catalytic kinetics and promoting Fe3+/Fe2+ cycle for PMS activation. As a result, the S-Fe-MoS2/PMS system exhibited a high catalytic rate constant (kobs) of 0.32 min−1, in the degradation of 4-chlorophenol (4-CP), 1.5 times higher than that of the conventional Fe-MoS2/PMS system. It also achieved 82.9% total organic carbon (TOC) degradation within 60 min. Additionally, it possessed similar degradation performance for various organic pollutants, along with remarkable reusability (four cycles) and broad pH adaptability (2–8), indicating significant potential for widespread application. This study provided a new way for developing advanced heterogeneous catalysts with high efficiency for water treatment.
研究领域:
环境科学
·
催化材料科学
✓ 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）