CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Fengjiao Lai,Feng Yan,Pengju Wang,Shubin Wang,Shun Li,Zuotai Zhang
The design of stable heteropolyacid (HPA) catalysts with strong Brønsted acidity and mild Lewis acidity is crucial for the efficient conversion of renewable biomass to value-added chemicals. Firstly, a novel strategy was proposed to synthesize the Ce-based HPA of H 5 CeW 12 O 40 . Secondly, the H 5 CeW 12 O 40 was combined with ChCl to form a series of temperature-responsive HPA catalysts (Ch n H 5-n CeW 12 O 40 , n = 1–5), which allowed the catalysts to be applied as soluble catalysts at a temperature >80 °C and be easily separated as an insoluble catalyst at a temperature <80 °C. In the H 2 O/DMSO/MIBK biphasic system, one-pot production of 5-hydroxymethylfurfural (5-HMF) from cellulose was achieved with an excellent yield of 67.5% over ChH 4 CeW 12 O 40 catalysis at 140 °C for 6 h, and other carbohydrates were converted, including fructose (83.1%), glucose (74.2%), sucrose (75.8%), cellobiose (70.2%) and starch (68.7%). Such high efficiency was attributed to the homogeneous catalysis at high temperature, the strong Brønsted acidity of [H 5-n CeW 12 O 40 ] n− , and the appropriate Lewis acidity from Ce(III). Moreover, the temperature-responsive property and the high stability were beneficial for recycling without significant structural change and activity loss.
研究领域:
化学工程
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生物质能
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催化化学
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2015
·Vol. 64
·期 10
·1415-1424
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IF 2.409
Weijuan Sheng,Teng Liu,Shouxin Liu,Qinqin Wang,Xuan Li,Naer Guang
A novel temperature responsive copolymer, poly[2-(2-methoxyethoxy)ethyl methacrylate- co -oligo(ethylene glycol)methacrylate- co-N -hydroxymethyl acrylamide] [P(MEO 2 MA- co -OEGMA- co -HMAM)], was synthesized by atom transfer radical polymerization. pH responsive poly(methacrylic acid) (PMAA) was synthesized by reversible addition-fragmentation chain transfer polymerization. After the hydroxyl groups on P(MEO 2 MA- co -OEGMA- co -HMAM) were transformed into azide groups and the carboxyl groups on PMAA were transformed into alkyne groups respectively, a novel temperature and pH responsive hydrogel was fabricated by click chemistry between the azide-P(MEO 2 MA- co -OEGMA- co -HMAM) and alkyne-PMAA in the presence of CuSO 4 and sodium ascorbate in aqueous solution. The rheological kinetics of gel formation demonstrated that gelation had commenced within 5 min at 25 °C, since then the storage modulus ( G ′) was higher than the loss modulus ( G ″). SEM images of hydrogel morphology and the swelling ratios of hydrogel at different temperatures and pH proved that the formed hydrogel had temperature and pH sensitivities. Bovine serum albumin was used as a model to evaluate the sustained release of the hydrogel; the results indicated that the hydrogel was a promising candidate for controlling protein drug delivery. © 2015 Society of Chemical Industry
研究领域:
材料科学
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生物医学工程
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高分子化学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2023
·
IF 6
Xinyu Ma,Pan Du,Ben Niu,Jiaxuan Zhang,Huaisong Yong,Xianru He
Though the mechanism of temperature-induced lower critical solution temperature (LCST) in water is clear for the classic homopolymer poly( N -isopropylacrylamide) (PNIPAM), the LCST of other homopolymer or copolymer remains to be understood. In this work, a novel random copolymer poly(2-hydroxyethyl- co -methyl acrylate) (P(HEA- co -MA)) was prepared. The LCST of the copolymer P(HEA- co -MA) can vary from 11 °C to 65 °C by adjusting flexibly the ratio of the two monomers, showing a broad tunable range. The experimental results showed that the balance of hydrogen bond bridge formed by P(HEA- co -MA) in water and the hydrophobic interaction between polymers can cause the LCST transition of P(HEA- co -MA). An interesting observation is that the sharp phase transition (cosolvency) of P(HEA- co -MA) exists when a rather small amount of alcohol or water is added in polymer solutions at constant temperatures. Moreover, it was found that the increase of LCST is correlated with the increase of alcohol concentration in the water-rich regime, but the decrease of upper critical solution temperature (UCST) is related to the increase of water concentration in the alcohol-rich regime. This work shed light on the understanding of cosolvency by studying the solution behavior of copolymer P(HEA- co -MA) in mixed solvents, which can be of interest for the design of stimuli-responsive polymer materials by variation in solvent composition.
研究领域:
高分子化学
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材料科学
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物理化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Bing Qi,Bingjie Fan,Bo Xu,Man Zhou,Yuanyuan Yu,Li Cui,Qiang Wang,Ping Wang
In view of the frequent occurrence of oil-containing pollutant discharge events, many optimal strategies for oil-water separation were proposed. However, the large-scale application of these strategies is severely limited by the lack of environmental unfriendliness and intelligent response capability. To address these issues, we developed a thermo-responsive fabric with switchable wettability that can be applied for efficient oil-water separation by an eco-friendly enzymatic method . Briefly, 3-(trimethoxysilyl) propyl methacrylate (KH-570) and boron nitride (BN) nanosheets were introduced to the surfaces of cotton fabric, followed by enzymatic graft polymerization of N,N -dimethyl (methacryloylethyl) ammonium propane sulfonate (DMAPS) onto the fibers using horseradish peroxidase (HRP). Thanks to the switchable wettability of the composite layer on the yarn surfaces, oil and water can pass through the cotton fabric at the temperatures below and above 28 °C, respectively, realizing highly efficient oil-water separation. The resulting temperature-responsive textiles exhibit encouraging separation performance, and the separation efficiency, oil flux, and water flux reach as high as 95%, 542.57 L·h −1 m −2 , and 477.26 L·h −1 m −2 , respectively. Meanwhile, the cyclic separation capability, acid-alkali tolerance, and mechanical friction stability of the composite textiles are encouraging. The present work provides an alternative for construction of oil-water separation materials, which inspires further research on the smart oil-water separation strategies.
研究领域:
材料科学
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环境科学
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生物化学
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2023
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IF 4.1
Ying Wang,Xiaodan Wu,Guansong Shao,Tao Wang,Zihan Wang,Bingyang Qin,Jingru Zhao,Zhiguo Liu,Yujie Fu
In this article, thermosensitive molecularly imprinted polymer and composite aerogel were combined for the first time to create an intelligent temperature-responsive aerogel reactor to effectively enrich ursolic acid (UA). Because aerogel carrier had a higher specific surface area and higher porosity compared to other carriers, the ursolic acid molecularly imprinted intelligent temperature responsive aerogel reactor (ITR&AR(G570)&UA-MIP) demonstrated a higher adsorption capacity for UA. More notably, ITR&AR(G570)&UA-MIP have the extraordinary capacity to spontaneously adsorb-desorb target molecule UA by regulating the reaction temperature. The ratio of the target molecule UA to the functional monomer and crosslinker in the grafting process and external influences had a major impact on how ITR&AR(G570)&UA-MIP were prepared overall. When the molar ratio of UA to 4-VP was 1:8, the weight ratio between ITR&AR(G570)&UA-MIP and EGDMA/DVB was 1:2:10, the reaction temperature was 60 °C, and the ambient pH = 6, the material showed the best adsorption capacity, reaching a peak of about 70 mg g −1 . After researching the appropriate synthesis conditions, ITR&AR(G570)&UA-MIP were applied to lingonberry (Vaccinium Vitis-Idaea L .) berry extracts in this work. The outcomes show that this technique provides a new, intelligent, temperature-controlled adsorption material for the solid-phase extraction of triterpenoid acids in natural products, with good specific adsorption performance for the target molecule UA.
研究领域:
材料科学
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药物化学
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生物技术
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
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2022
·Vol. 11
·期 2
·480-487
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IF 8.067
Xiaoyu Liu,Qin He,Jiageng Pan,Hui Liang,Noreen Rehmat,Liang Gao,Yanping Huo,Shaomin Ji
Effective triplet–triplet annihilation photon upconversion (TTA-UC) is usually difficult to achieve under aerobic conditions, but is highly desirable for practical applications in which durability is greatly needed to sustain environmental loads and expand the lifespan of the relevant devices. Here, we developed a novel upcoversion organogel with platinum octaethylporphyrin (PtOEP) as sensitizer, 9,10-diphenylanthracene (DPA) as acceptor and n-octanal-modified polyvinyl alcohol (PVA) as structural matrix. The acquired organogel demonstrated self-healing ability and malleability. The exquisite combination of these components affords a variety of features, such as high oxygen resistance, high transparency, strong mechanics, and malleability, benefitting from the dynamic features of the noncovalently crosslinked network and highly compact morphology as well as the enhanced contact probability of the chromophores. The organogel shows effective green-to-blue upconversion, with a quantum yield ΦUC of up to 6.7% in the aerobic environment. The upconversion efficiency of the organogel can maintain over 67% of its original value after long-term sealed storage (>180 days). This research provides a simple and effective strategy for the development of high-efficiency upconversion solid carrier materials.
研究领域:
材料科学
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光学
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化学
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DOI
高影响因子
ACS Applied Polymer Materials
·
2020
·
IF 0
Dong Wang,Yuzheng Xia,Dong Zhang,Xiaomeng Sun,Xiaonong Chen,Susan Oliver,Shuxian Shi,Lei Lei
Most injectable hydrogels are prone to irreversible deformation or damage under sustained shear forces and exhibit low mechanical properties, which limit their practical applications in biological engineering. In this work, the first hydrogen-bonding reinforced injectable thermoresponsive hydrogel system has been fabricated through an in situ hydrazide–aldehyde cross-linking reaction between hydrazide-functionalized poly(N-isopropylacrylamide) (PNIPAM) and dialdehyde dextrin. The mechanical strength and stability of the hydrogel were reinforced by the introduction of intermolecular hydrogen-bonding from poly(N-acryloyl glycinamide) (PNAGA), which possesses great biocompatibility and similarity to PNIPAM. The internal morphology, dynamic moduli, de-cross-linking properties, and temperature responsiveness of the hydrogels were systematically investigated. Upon hydrogen-bonding reinforcement, the hydrogel elasticity, reflected by the maximum storage modulus, dramatically increased from 90.2 to 517.0 kPa, which is about a 570% increase compared with unreinforced hydrogels. In addition, the mechanical properties of the hydrogel were reinforced as the de-cross-linking could be inhibited by PNAGA-based hydrogen-bonding. The temperature release behavior of the hydrogel was assessed with a model drug (propranolol hydrochloride, PHCl) and could be precisely controlled by adjusting the environmental temperature between 25 and 37 °C. Therefore, PNAGA reinforced thermoresponsive hydrogels are promising functional biological materials for use in tissue-repair engineering and controlled-release drug delivery.
研究领域:
生物材料
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组织工程
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药物递送系统
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DOI
ENERGY & FUELS
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2024
·
IF 5.2
Yifan Wang,Kaifeng Lu,Yuan Zhao,Lingjun Zhu,Shurong Wang
Converting renewable biomass into liquid fuels and value-added chemicals has emerged as a pivotal technology, driving the transformation of the energy landscape. Efficiently transforming the cellulose components of biomass into the crucial liquid fuel precursor levulinic acid holds profound significance. The principal objective of this study is to fabricate a temperature-responsive catalyst based on Al-doped silicotungstic acid, which is intended for converting glucose into levulinic acid. By exploiting the interaction between choline chloride and silicotungstic acid, which exhibits a notable capacity for high proton migration, we successfully synthesized a stable acid catalyst with responsive properties to temperature changes. Through precise adjustments of Al3+ concentration, we engineered a collection of Lewis/Brønsted composite catalysts capable of responding to temperature variations. A comprehensive analysis of the catalyst’s structure and acidity was conducted using various techniques including FTIR, XRD, TEM, and Py-IR. These methods revealed crucial insights into the crystalline architecture, surface morphology, and distribution of acidic domains, providing a solid foundation for a deeper understanding of the catalytic reaction mechanism. Through the meticulous optimization of key reaction parameters, including Al3+ loading, solvent composition, reaction temperature, and reaction duration, the ChAl2/3HSiW12O40 catalyst achieved its pinnacle of efficiency at 150 °C over an 8 h period. This resulted in the remarkable outcome of complete glucose conversion, yielding an impressive 62.01% of levulinic acid. Additionally, an evaluation of the catalyst’s recyclability was carried out, demonstrating its commendable hydrothermal stability and ability for repetitive usage without any reduction in catalytic efficiency.
研究领域:
化学工程
·
可再生资源转化
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产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 9
·1248
·
IF 4.7
Pengzhi Bi,Xiuzhong Zhu,Li Tian,Jinbang Han,Wanbin Zhang,Tong Wang
In recent years, a great deal of work has been devoted to the development of thermoresponsive polymers that can be made into new types of smart materials. In this paper, a branched polymer, HTPB-g-(PNIPAM/PEG), with polyolefin chain segments as the backbone and having polyethylene glycol (PEG) and poly(N-isopropylacrylamide) (PNIPAM) as side chains was synthesized by ATRP and click reactions using N3-HTPB-Br as the macroinitiator. This initiator was designed and synthesized using hydroxyl-terminated polybutadiene (HTPB) as the substrate. The temperature-responsive behavior of the branched polymer was investigated. The lower critical solution temperature (LCST) of the branched polymer was determined by ultraviolet and visible spectrophotometry (UV-vis) and was found to be 35.2 °C. The relationship between the diameter size of micelles and temperature was determined by dynamic light scattering (DLS). It was found that the diameter size changed at 36 °C, which was nearly consistent with the result obtained by UV-vis. The results of the study indicate that HTPB-g-(PNIPAM/PEG) is a temperature-responsive polymer. At room temperature, the polymer can self-assemble into composite micelles, with the main chain as the core and the branched chain as the shell. When the temperature was increased beyond LCST, the polyolefin main chain along with the PNIPAM branched chain assembled to form the nucleus, and the PEG branched chain constituted the shell.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Pan Gu,Na Fan,Yexin Wang,Jiping Wang,Peter Müller-Buschbaum,Qi Zhong
Linear control of moisture permeability and anti-adhesion of bacteria in a broad temperature region are realized by cross-linking thermoresponsive microgels onto cotton fabrics. The microgels are copolymerized by monomers di(ethylene glycol) methyl ether methacrylate (MEO2MA), (ethylene glycol) methyl ether methacrylate (OEGMA300), and ethylene glycol methacrylate (EGMA) with a molar ratio of 10:10:1. Transition temperatures of PMEO2MA and POEGMA300 are 25 and 60 °C, respectively. Due to the compression of already collapsed PMEO2MA to still swollen POEGMA300, the microgels present a linear shrinkage in a broad temperature region (20–70 °C). Additionally, the contact angle of the microgels stays below 60° even if the temperature is increased to 50 °C, illustrating the reserved surface hydrophilicity. The obtained microgels are cross-linked onto cotton fabrics by 1,2,3,4-butanetetracarboxylic (BTCA). The weight gain ratios (WGRs) are 15% and 30%. The moisture permeability shows an excellent linear increase between 20 and 50 °C when the WGR is 30%, which is attributed to the linear shrinkage of the cross-linked microgels upon heating. Because the moisture permeability is related to the fabric comfort, a linear control of comfort is obtained. In addition, the cross-linked cotton fabrics can realize 96.5% bacterial anti-adhesion at 30 °C as the surface remains hydrophilic. On the basis of these two unique properties, the realized cotton fabrics cross-linked with microgels are promising for application as smart textiles for wound addressing.
研究领域:
材料科学
·
纺织工程
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR BIOSCIENCE
·
2013
·Vol. 13
·期 4
·494-502
·
IF 3.742
Jun Shi,Chao Du,Jin Shi,Yaming Wang,Shaokui Cao
Hollow multilayer microcapsules made of aliphatic poly(urethane-amine) (PUA) and sodium poly(styrene sulfonate) (PSS), templated on PSS-doped CaCO 3 particles, are prepared for pH-/thermally responsive drug delivery. The electrostatic interaction and hydrogen bonding under weak-acid conditions between aliphatic PUA and PSS contribute to the formation of multilayer microcapsules. Scanning electron microscopy (SEM) results demonstrate an obvious variation of the hollow multilayer microcapsules in response to changes in temperature and pH value. Drug-release behaviors using DOX as a model drug demonstrate that the drug release increases on decreasing the pH value because of the interaction weakness between aliphatic PUA and PSS in acidic conditions. Moreover, the drug release is higher at 55 °C than that at 37 °C for the sake of the shrinkage of aliphatic PUA above its lower critical solution temperature (LCST).
研究领域:
材料科学
·
药学
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2016
·Vol. 34
·期 6
·777-784
·
IF 1.811
Shi Mei,Duan Xin-rui,Liu Zhao-tie,Liu Zhong-wen,Jiang Jin-qiang
A betaine-type styrene monomer with the quaternary ammonium-borate anion inner-salt pair was synthesized through the quaternization reaction and polymerized to afford the target polybetaine of poly(4-vinylbenzyl methyl-diethanol ammonium borate) (PVMAB). The chemical structures of the monomer and polymer were well demonstrated with 1 H-NMR and 11 B-NMR spectra analysis. The thermal-sensitive experiment showed that PVMAB in water afforded gradually welldefined sigmoidal transmittance-temperature ( T - t ) curves along with the increasing polymer concentration. However, the phase transition temperatures at the bottom of the S-shaped curves were always below 10 °C due to the very weak zwitterionic association of the ammonium-borate inner-salt pairs. The UCST phase transition could also be tuned by changing the ethanol content in the ethanol/water mixture. And the cytotoxicity experiment demonstrated the good biomimetic property of PVMAB. This study enriches the toolbox of polybetaines by introducing the quaternary ammonium-borate anion zwitterionic pair in the repeat units, therefore broadens the scope of synthetic polybetaines.
研究领域:
材料科学
·
生物学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）