JOURNAL OF BIOSCIENCE AND BIOENGINEERING
·
2016
·
IF 1.964
Xiaoyao Fei,Shaoyun Chen,Dai Liu,Chunjie Huang,Yongchun Zhang
Two functionalized SBA-15 [amine-functionalized SBA-15 (AFS) and epoxy-functionalized SBA-15 (GFS)] with different types of functional groups were synthesized by a hydrothermal process and post functionalized with 3-aminopropyltriethoxysilane (APTES) and 3-glycidyloxypropyltrimethoxysilane (GPTMS), respectively. They were used for the immobilization of carbonic anhydrase (CA). The physicochemical properties of the functionalized SBA-15 were characterized by X-ray powder diffraction (XRD), N 2 adsorption–desorption, 13 C, 29 Si solid-state nuclear magnetic resonance (NMR) spectroscopy, and scanning electron microscopy (SEM). Before and after CA was immobilized on AFS and GFS, the effects of temperature and pH value on the enzyme activity , storage stability, and reusability were investigated using para -nitrophenyl acetate ( p -NPA) assay. CA/GFS showed a better performance with respect to storage stability and reusability than CA/AFS. Moreover, the amount of CaCO 3 precipitated over CA/AFS was less than that precipitated over CA/GFS, which was almost equal to that precipitated over the free CA. The results indicate that the epoxy group is a more suitable functional group for covalent bonding with CA than the amino group, and GFS is a promising support for CA immobilization.
研究领域:
生物化学
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材料科学
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DOI
PubMed
高影响因子
Polymer Chemistry
·
2017
·Vol. 9
·期 1
·108-120
·
IF 5.375
Lincan Yang,Hongwei Ma,Li Han,Xinyu Hao,Pibo Liu,Heyu Shen,Yang Li
The alkynyl-functionalized 1,1-diphenylethylene (DPE) derivative DPE-yne was incorporated into a polymer chain through living anionic polymerization (LAP). An unanticipated coupling reaction occurred and could be restrained by extra feeding of DPE derivatives. Investigating the mechanism of the side coupling indicated that excess P-SLi coupled with the DPE-yne units in the chain when the feed of DPE-yne was insufficient. Although the use of excess DPE-yne can effectively restrain the side coupling during the copolymerization, these conditions afford only an alternating polymer sequence. For the diversity of sequence structure and multi-functionalization, another DPE derivative, DPE-NMe2, was introduced into the polymerization, and the use of an appropriate amount of DPE-NMe2 effectively inhibited the side coupling. Additionally, two functional groups (alkynes and amines) can be incorporated into polymer chains, and their sequence distribution was investigated. The in situ1H NMR method was applied to monitor the chain propagation during the terpolymerization in real time. The in situ1H NMR results showed that the entire sequence is a gradient structure with compositional drift from a predominant St-(DPE-yne) fraction initially to a St-(DPE-NMe2) fraction finally, and the sequence between them is a gradual transition fraction. Consistent with the special sequence distribution in the polymer chain, the terpolymerization kinetic was investigated, and the apparent kinetic constants for each monomer were obtained. The corresponding reactivity ratios (rSt) were also calculated. The rSt-Dyne and rSt-Dnme were simulated as 0.08 and 5.8 during the terpolymerization, respectively. The terpolymerization investigated here not only inhibited the side coupling reaction but also allowed the introduction of a third functional monomer; moreover, its sequence structure shows potentially novel and intriguing properties that could further the applications of functionalized polymers.
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Yanjun Ren,Yufen Zhai,Liansong Wu,Wenjing Zhou,Haihang Qin,Pingquan Wang
Shale hydration is the main cause of wellbore instability during drilling using water-based drilling fluids (WBD). In this work, NH 2 - and HO-functionalized ionic liquids (ILs) were investigated for their performances on inhibiting the shale hydration, as well as their influences on the properties of WBD, using immersion and sedimentation tests, linear swelling test, hot-rolling dispersion test, rheological and filtration experiments. The mechanisms were identified by X-ray diffraction (XRD), zeta-potential and particle size distribution analyses, scanning electron microscopy (SEM) and related theoretical analysis. Evaluation experiment results showed that the NH 2 -functionalized IL had the best inhibition performance, followed by poly(propylene glycol)bis(2-aminopropyl ether), HO-functionalized IL and KCl. NH 2 -functionality was more favorable to shale inhibition than HO-functionality. When used in WBD, ILs could prevent viscosity building-up at high temperature, but cause filtration and inhibition failure, which could be mitigated when polyanionic cellulose (PAC) was added in WBD prior to inhibitors. Three critical observations helped elucidate the inhibitive mechanisms: the intercalation of cationic groups of ILs into the clay interlayers, the decrease of both interlayer spacing and double layer thickness. The NH 2 -functionalized IL allowed the smallest interlayer spacing and double layer thickness and therefore performed best in inhibition. The inhibition failure in WBD with ILs depended on two aspects: the consumption of ILs untimely and the filtration failure of WBD. PAC could decrease both of ILs’ loss within WBD and water loss toward shale, mitigating the WBD’s inhibition failure. Our work will facilitate the rational design of efficient and environmentally acceptable inhibitors and their rational applications in WBD for drilling shale formation.
研究领域:
石油工程
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化学工程
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DOI
高影响因子
Small
·
2021
·Vol. 17
·期 34
·2101048
·
IF 13.281
Junning Zhang,Haibo Ding,Xiaojiang Liu,Hongcheng Gu,Mengxiao Wei,Xiaoran Li,Shengnan Liu,Sen Li,Xin Du,Zhongze Gu
Two-photon lithography (TPL) is a powerful tool to construct small-scale objects with complex and precise 3D architectures. While the limited selection of chemical functionalities on the printed structures has restricted the application of this method in fabricating functional objects and devices, this study presents a facile, efficient, and extensively applicable method to functionalize the surfaces of the objects printed by TPL. TPL-printed objects, regardless of their compositions, can be efficiently functionalized by combining trichlorovinylsilane treatment and thiol–ene chemistry. Various functionalities can be introduced on the printed objects, without affecting their micro-nano topographies. Hence, microstructures with diverse functions can be generated using non-functional photoresists. Compared to existed strategies, this method is fast, highly efficient, and non photoresist-dependent. In addition, this method can be applied to various materials, such as metals, metal oxides, and plastics that can be potentially utilized in TPL or other 3D printing technologies. The applications of this method on the biofunctionalization of microrobots and cell scaffolds are also demonstrated.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2021
·
IF 3.196
Qi Yao,Ruifeng Zhan,Hegang Ren,Bo Yang,Ying Yang
Stringent water resources scarcity and severe environmental restriction requires environmentally friendly and efficient scale inhibitors exploitation. Functionalization of polyamidoamine dendrimers for scale inhibitor was performed using 2-phosphate-1, 2, 4-butane tricarboxylic acid (PBTCA) and succinic anhydride (SA). In this study, PBTCA modified polyamidoamine dendrimers (PAMAM-1), SA modified first and second generation polyamidoamine dendrimers (CAMAM-1 and CAMAM-2) are prepared. Static scale inhibition method is employed to assess the scale inhibition efficiency of linear low molecular polyacrylic (LPAA), PBTCA, PAMAM-1, CAMAM-1 and CAMAM-2 against CaCO 3 and CaSO 4 . The results show that carboxyl terminated polyamidoamine dendrimers has excellent scale inhibition performance comparable to PBTCA and PAMAM-1. Compared to LPAA and PBTCA, dendritic structure can effectively improve the scale inhibition performance of the scale inhibitor. Furthermore, the scale inhibition performance enhances with increasing generation of carboxyl-terminated polyamidoamine dendrimer. The inhibition efficiency of CAMAM-2 against CaCO 3 and CaSO 4 is about 96.3% and 95.2% at a concentration of 10 mg/ L. Moreover, The CAMAM-2 performs above 85% scale inhibition at Ca 2+ concentration is 4000 mg/L and 90% scale inhibition at border pH 5–9. The FT-IR, XRD and SEM-EDX results show that the CaCO 3 changes from stable calcite to metastable aragonite and vaterite, and the needle like structure of CaSO 4 is destroyed to small crystals. CAMAM-2 only occupies the crystallization site and distorts the lattice of calcium scale in the crystal growth process rather than adsorb on the final crystal surface. This paper provides data support for the application of phosphate or carboxyl terminated polyamidoamine dendrimer in scale inhibition.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2024
·
IF 7.2
Cheng Zhang,Ning Zhou,Shiting Wang,Xiaoxia Yang,Tingyan Peng,Zhifeng Dai,Feiyong Xiang,Yubing Xiong
The efficient conversion of atmospheric CO 2 into high value-added chemicals remains a persistent challenge. In this study, a novel strategy for the fabrication of triazine- and amino-functionalized poly(ionic liquid)s (PILs) was reported. By virtue of the rich nitrogen species, the newly-developed PILs possessed great potential in CO 2 conversion to produce high-value chemicals. The systematic investigation illustrated that rich-nitrogen PILs could promote the cycloaddition reaction of CO 2 and epoxides through the intramolecular synergy of multiple active sites. Excellent conversion and selectivity were achieved under the mild conditions without any co-catalysts and solvents. In addition, PIL heterogeneous catalysts could be easily recovered and reused at least several times without obvious loss in activity. The density functional theory calculation demonstrated that the superior catalytic activity of rich nitrogen PILs was attributed to the synergistic effect of hydrogen bond donor and triazine ring in the catalytic process. Our finding thus presents a versatile platform for fabricating multi-functional heterogeneous catalysts for efficient CO 2 conversion.
研究领域:
化学
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催化材料
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环境科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 24
·65712-65727
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IF 5.8
Wang Bing,Zeng Yao,Ou Jinghan,Xiong Mingyang,Qiu Ruisi
In recent years, metal-organic frameworks (MOFs) have been employed in numerous applications for adsorption. Researchers synthesize new MOFs by various methods, including the introduction of functional groups. In this study, three different aluminum-based MOFs (with non-functionalized, amino-functionalized, nitro-functionalized) were produced by hydrothermal synthesis and used for investigating typical endocrine disrupting chemicals (EDCs), namely for bisphenol A (BPA) adsorption. We used several methods to characterize the MOFs and conducted batch adsorption experiments to investigate their adsorption properties, and explore the influence of different functional groups on adsorption materials. The specific surface area of Al-MOF-NH 2 is 6 times larger than that of Al-MOF according to the N 2 adsorption and desorption isotherms of the material, that is, the BET of Al-MOF, Al-MOF-NH 2 , and Al-MOF-NO 2 were 109.68, 644.03, and 146.60 m 2 /g. Note that although the same synthesis method is used, pore size is greatly changed because of the different functional groups. Al-MOF and Al-MOF-NO 2 have more mesopores, and Al-MOF-NH 2 is mainly microporous. The BPA adsorption capacities of Al-MOF, Al-MOF-NH 2 , and Al-MOF-NO 2 were 46.43, 227.78, and 155.84 mg/L. The outcomes can also be explained by the improved adsorption performance from the addition of amino functional groups. In this research, the adsorption isotherms and adsorption kinetics of the three Al-MOFs for BPA were also investigated to explain the different adsorption properties of various functional groups. The results show that the amino-functionalized materials have remarkable characterization morphologies, uniform particle distributions, appropriate particle sizes, excellent specific surface areas, and superior adsorption effects. Graphical abstract
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Yuanting Qiao,Zhen Zhan,Yuwan Yang,Manying Liu,Qi Huang,Bien Tan,Xuebin Ke,Chunfei Wu
Hypercrosslinked polymers (HCPs) are very promising for large-scale applications due to their easy preparation, high thermal stability, and good capability of CO 2 capture. Currently, many amine-functionalized porous materials are prepared through two steps. In this paper, the amine-functionalized HCPs was obtained with a one-step method and it showed a high CO 2 adsorption up to 4.24 mmol/g at 273.15 K. In addition, since the azo-functionalized porous materials have many potential applications like the photoresponsive ‘smart’ materials, azobenzene is an attracting functional group for the development of porous materials. Herein, the azo-functionalized HCPs is firstly reported, and it is used as CO 2 adsorbents (3.02 mmol/g at 273.15 K) performing good CO 2 /N 2 selectivity (34.52 at 298.15 K).
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
POLYMER
·
2025
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IF 4.5
Congmei Lin,Chengcheng Zeng,Shijun Liu,Bo Jin,Zhijian Yang,Jiahui Liu,Liping Pan,Chunliang Ji,Lixiao Hao,Yushi Wen,Feiyan Gong,Jiang Li,Shaoyun Guo
The poor interfacial adhesion between energetic crystals and polymer matrices results in undesirably low mechanical properties, limiting the application of energetic composites. Surface engineering has been widely implemented in materials science to regulate the mechanical properties. However, to achieve strong interfacial adhesion with precise control of interfacial structure is attractive and highly challenging for polymer bonded explosives. To address this issue, a covalent functionalization strategy were developed via the self-polymerization of dopamine on the surface of the energetic crystals, followed by the covalent grafting of fluoro-polymers using toluene-2,4-diisocyanate (TDI) as a bridging molecule. In-depth characterizations, combined with molecular dynamics simulation, have been systematically adopted to investigate the interfacial interaction and mechanical performance after covalent grafting of fluoro-polymers. Remarkably, both experimental results and numerical simulations revealed that the covalent functionalization and fluorine-containing binder system significantly increased the number of hydrogen bonds and interfacial interactions, thereby enhancing the interfacial adhesion between energetic crystals and the polymer matrix. Energetic composites with fluoro-polymer functionalization exhibited substantial interfacial enhancement effects. The mechanical properties of the composites improved with increasing grafted fluoro-polymer content. The composites based on energetic crystals with 2 wt% grafted fluoro-polymer exhibited optimal performance, with compressive and tensile fracture energies increased by 97.7 % and 182.0 %, respectively, compared to the unmodified composites. Additionally, computational simulations provided fundamental insights into how the interfacial structure affects the mechanical properties of energetic composites, confirming that the covalent functionalization and fluorine-containing binder system enhance interfacial adhesion by increasing hydrogen bond numbers and interfacial interactions.
研究领域:
材料科学
·
爆炸物工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yi Liu,Shuangjiang Li,Ying Chen,Mengrui Li,Zewen Chen,Tianding Hu,Lan Shi,Manoj Pudukudy,Shaoyun Shan,Yunfei Zhi
The development of highly efficient and metal- and halogen-free heterogeneous catalysts for the chemical conversion of CO 2 to cyclic carbonates plays a critical role in the reduction of greenhouse gas emissions. Herein, two melamine-based organic polymers namely UM-OP and AM-OP with abundant N sites and –NH- groups were synthesized by a facile method and their activity for cycloaddition of CO 2 with epoxides was investigated. The structural analysis shows that the UM-OP and AM-OP catalysts were composed of specially designed urea and amide group linkages, respectively. UM-OP and AM-OP are metal-free, halogen-free, and can efficiently catalyze CO 2 cycloaddition under solvent-free and cocatalyst-free conditions. Moreover, the UM-OP catalyst exhibited higher catalytic activity than AM-OP, good structural stability, recyclability, separability from the products, and shown high activity to a series of epoxides. The density functional theory (DFT) calculations revealed the activation of epoxides by –NH- groups and CO 2 by N sites in the samples, respectively, and N sites can also act as nucleophiles to realize ring opening of epoxides. Combining the results of experiments and calculations, it was further found that the double –NH- (urea group) is more efficient than single –NH- (amide group) to activate the epoxides. This paper reveals the mechanism of N sites and –NH- groups synergistically catalyzing the CO 2 cycloaddition, and further supports the theory that N atoms acts as nucleophile for ring opening, providing a reference for the design of metal- and halogen-free heterogeneous catalysts.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2016
·
IF 2.38
Baohua Yue,Guangbo Zeng,Yepei Zhang,Sheng Tao,Xiaoming Zhang,Liuming Yan
The synergetic proton conducting effect was observed in an acid-base composite composed of phosphonic acid functionalized polysulfone (PSF-PA) and triazolyl functionalized polysulfone (PSF-CH 2 -iPrOHTri), with three orders of magnitude improvement compared to that of the acidic or basic component. The maximum proton conductivity of 42.71 mS cm − 1 at 100 °C and 90% RH was observed in PSF-PA/PSF-CH 2 -iPrOHTri composite membrane composed of 75.0% PSF-CH 2 -iPrOHTri. In addition, the acid-base composite membrane showed higher thermal and oxidative stability , reduced hydrophilicity and methanol permeability , significantly improved mechanical strength . For the hydrated membranes of PSF-PA or PSF-CH 2 -iPrOHTri, the tensile strengths showed significant degradation with values only about halves of the dry membranes. On the other side, the tensile strength of the acid-base composite composed of 75.0% PSF-CH 2 -iPrOHTri showed only slight drop from 35.52 MPa to 30.59 MPa.
研究领域:
材料科学
·
燃料电池技术
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产品关联
DOI
高影响因子
ANALYST
·
2022
·Vol. 147
·期 9
·1995-2007
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IF 5.227
Rui Han,Fei Wang,Chuanfeng Zhao,Meixing Zhang,Shihai Cui,Jing Yang
Pyrethroids and neonicotinoids are widely used insecticides. However, their residues have unfavorable effects on ecological systems. Magnetic solid phase extraction is a reliable pretreatment method for a better detection of insecticides at low concentrations. In this work, amino- and carboxyl-functionalized magnetic KIT-6 were designed according to the electron-accepting groups of pyrethroid molecules and electron-donating groups with neonicotinoid structures. The characterization of these two materials was conducted using transmission electron microscopy, scanning electron microscopy, nitrogen adsorption–desorption analysis, etc. The aminated composite was applied to the magnetic solid phase extraction of pyrethroid insecticides while the carboxylic one was applied to neonicotinoids, and the adsorption effects were comprehensively compared for the first time. The material dosage, solution pH, and some factors that influenced the recovery were studied and optimized. The adsorption processes of the materials were all spontaneous and exothermic. They also fitted well with pseudo-second order kinetics and Langmuir adsorption isotherms. Both physical (pore function) and chemical (electrostatic interaction) adsorption mechanisms were present in the process. The two nanocomposites were then successfully used to enrich the two kinds of insecticides in environmental water samples. The proposed method has great application potential for insecticide monitoring in complex environmental samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）