JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Lingqi Wang,Xueying Chen,Jiajia Liu,Zhijian Tan
Recently, the use of stimuli-responsive ionic liquids (ILs) as extractants has received close attention due to their retrievability. In this study, a temperature-responsive ionic liquid (TR-IL) was synthesized and used for the extraction and subsequent separation of liquiritin (LQ) and glycyrrhizic acid (GA) from licorice ( Glycyrrhiza uralensis Fisch) root. This TR-IL was used as the extractant below its lower critical solution temperature (LCST), whereas it became hydrophobic to form a biphasic system to separate the two target compounds above its LCST. LQ and GA were distributed in the IL and aqueous phases, respectively. Moreover, the factors influencing the extraction and separation processes were studied to optimize the experimental conditions. The extraction yields of 9.63 and 28.51 mg/g and the distribution coefficients of 3.2 and 4.42 were obtained for LQ and GA, respectively. The selectivity coefficient of this biphasic system for LQ and GA was 14.2. Finally, the TR-IL was recycled and reused after extraction and separation. This study developed an efficient, green and sustainable strategy for the extraction and selective separation of bioactive ingredients from natural products.
研究领域:
化学工程
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药学
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分析化学
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绿色化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Chao Zheng,Xiaoyi Chen,Yuzhu Chen
Hydrogels containing polymers with a lower critical solution temperature (LCST) show great potential for thermochromic smart windows due to their excellent optical performances. However, relatively high cost limits their industrial application as building materials. To reduce costs, commodity chemicals acrylamide and diacetone acrylamide were used as raw materials to prepare these hydrogels. Additionally, a composite hydrogel strategy was employed, wherein polyacrylamide hydrogel is combined with a thermosensitive acrylamide/diacetone acrylamide copolymer, further reducing use of the more expensive diacetone acrylamide. Ultimately, by replacing only 3% of acrylamide with diacetone acrylamide, a composite hydrogel with excellent thermal stability and homogeneity during and after clouding was achieved. This hydrogel outperforms two classical systems: hydroxypropyl cellulose solution and poly( N -isopropylacrylamide) hydrogel. Furthermore, the composite hydrogel exhibits excellent luminous transmittance (90%) at low temperature and high modulation capability of luminous transmittance (74%), demonstrating significant cost efficiency for thermochromic smart windows.
研究领域:
材料科学
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高分子化学
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智能材料
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建筑节能
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Liangmiao Zhang,Hui Xia,Fang Xia,Yi Du,Yupeng Wu,Yanfeng Gao
Hydroxypropyl cellulose (HPC) hydrogels exhibit thermal-responsive transparency change due to their temperature-sensitive miscible–immiscible transitions, making them promising thermochromic materials for fabricating energy-saving smart windows. However, their transition temperatures, named lower critical solution temperature (LCST), are too high for building window applications, and it is also challenging to reduce LCST to comfortable room temperature range (e.g., 26–28 °C) in hot seasons. In this work, we report smart windows prepared using poly(acrylic acid) (PAA)-modified HPC hydrogels and demonstrate that the LCST of the resulting HPC/PAA hybrid hydrogels can be effectively tuned by solution pH, from 44 to 10 °C with decreasing pH from 6.0 to 1.0. At pH 2.5, an optimized LCST at 26.5 °C has been achieved. The sandwich-structured smart window, composed of two glass panes and an optimized HPC/PAA hydrogel in between, shows a high visible-light transmittance (Tlum = 90.1%), excellent solar energy modulation (ΔTsol = 47.5%), outstanding heat-shielding performance, and excellent stability after 100 heating and cooling cycles. These optical properties outperform the reported thermosensitive cellulose-based materials, vanadium oxide based smart windows, and other thermosensitive hydrogel-based smart windows. Furthermore, HPC/PAA hydrogels are easy to prepare, nontoxic, biocompatible, low-cost, and environmentally friendly, making them very promising materials for energy-saving and climate-adaptable smart windows.
研究领域:
材料科学
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化学工程
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能源效率
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建筑技术
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2018
·Vol. 9
·期 46
·5521-5530
·
IF 4.927
Qiangjun Li,Yongjie Yuan,Lifang He,Shenglan Liu,Hailiang Zhang
Recently, multistimuli-responsive photo-luminescent materials have received more and more attention due to the basic theoretical research on them and their wide potential applications. In this article, we reported a new multistimuli-responsive luminescent monomer and its corresponding polymer materials based on an α-cyanostilbenic derivative. The prepared monomer and polymer exhibited aggregation-induced emission enhancement characteristics (AIEE). More importantly, they showed responsive behavior to temperature, UV irradiation and ionic strength. Their aqueous solution showed fluorescence thermosensitivity. At first, their luminescence intensity decreased slightly with the increasing temperature, and then their luminescence intensity enhanced greatly when the temperature increased to their lower critical solution temperature (LCST). With the further increasing of temperature, there was a significant decline in their luminescence intensity. They also exhibited different UV irradiation responsive behaviors in aqueous solution and THF solution. In aqueous solution, the LCST of their aqueous solution also changed after UV irradiation and their luminescence intensity increased first and then remained unchanged with increasing irradiation time. While in THF solution, their emission intensity decreased with UV irradiation time. The aqueous solution of the monomer and its corresponding polymer also exhibited obvious ionic strength response behavior. The LCST of their aqueous solution varied with the addition of different salts and the change rule was in good agreement with the Hofmeister effect and the emission intensity changed with the addition of salts.
研究领域:
材料科学
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化学
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高分子科学
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光化学
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产品关联
DOI
高影响因子
POLYMER
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2022
·
IF 4.432
Congcong Cui,Guojie Liu,He Gao,Min Wang,Jun Gao
A photo and thermal-responsive smart polymer, enabling controllable wettability according to different temperature and light conditions, was developed in this paper. The 3-(3′,3′-dimethyl-6-nitrospiro-[chromene-2,2′-indolin]-1′-yl) propyl methacrylate (SPMA) and N -isopropylacrylamide (NIPAAm) by 2,2′-azobis(isobutyronitrile) (AIBN) were grafted on the surface of polydimethylsiloxane (PDMS) to induce free radical polymerization . The SPMA isomerizes from a colorless, hydrophobic spiropyran (SP) form to a deep purple, hydrophilic merocyanine form (MCMA) upon UV-light. The wettability of poly( N -isopropylacrylamide) (PNIPAAm) is sensitive to temperature, showing hydrophobicity above the low critical solution temperature (LCST) and hydrophilicity below LCST. Furthermore, the addition of SPMA has realized the significant reversible wettability synergistic with PNIPAAm. The reversible wettability can be controlled by selectively applying single or both factors of light and temperature. Thus, practical application of the above controllable wettability can be greatly expanded. When the polymer is transferred from 40 °C (>LCST)-visible light to 10 °C (
研究领域:
材料科学
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聚合物化学
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表面科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 18
·e53805
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IF 3
Dezhong Xu,Ao Li,Weijie Lin,Qiuxia Zou,Shuai Wu,Ajoy Kanti Mondal,Wangchuan Xiao,Fang Huang
In this study, pH and thermally responsive P(PFPHM 9 - b -DMAEMA- b -PEGMEA 480 ) was prepared by atom transfer radical polymerization (ATRP) using perfluoropolyether hydroxyethyl methacrylate (PFPHM) as hydrophobic core, 2-(Dimethylamino) ethyl methacrylate as pH and thermal response function segment, and poly (ethylene glycol) methyl ether acrylate 480 as hydrophilic shell, respectively. The chemical structure, critical micelle concentration (CMC), lower critical solution temperature (LCST), biological toxicity, stability of micelles, drug-loading performance and cumulative drug release rate of prepared P(PFPHM 9 - b -DMAEMA- b -PEGMEA 480 ) were analyzed by 19 F NMR, 1 H NMR, FTIR, DLS, UV–Vis, laser confocal microscopy and fluorescence spectrophotometer. The results show that P(PFPHM 9 - b -DMAEMA- b -PEGMEA 480 ) exhibites a CMC of 7.5 g/L, LCST of 37.6°C and excellent micelle stability. Moreover, the analysis of drug-loading indicates that the polymer displayed drug loading efficiency (DL) is 21.3% and the encapsulation efficiency (EE) is 90.0%. Its cumulative drug release rates at pH = 6.5 (42°C) is almost double of those at pH = 7.4 (42°C), pH = 6.5 (37°C) and pH = 7.4 (37°C). These results suggeste that the P(PFPHM 9 - b -DMAEMA- b -PEGMEA 480 ) at pH ranging from 6.5 to 7.4 and temperature ranging from 37 to 42°C are pH and temperature sensitive. It has great potential application as a drug loading for DOX.
研究领域:
聚合物化学
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药学
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材料科学
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2013
·Vol. 52
·期 1
·87-95
·
IF 3.543
Aihua Li,Jingquan Liu,Guozhen Liu,Jizhen Zhang,Shengyu Feng
In this article, the preparation of fluorescent nanohybrids with core–shell structure and metal-enhanced fluorescence (MEF) effect was presented. The fluorescent core–shell nanohybrids were prepared using silver nanoparticles (AgNPs) as cores and fluorophore tethered thermoresponsive copolymers with tunable lower critical solution temperature (LCST) from 15 to 90 °C as shells. These thermoresponsive copolymers were synthesized by the random copolymerization of oligo(ethylene oxide) acrylate and di(ethylene oxide) ethyl ether acrylate using reversible addition–fragmentation chain transfer polymerization and grafted on to AgNPs surface via Ag–S coordination interaction. By thermal manipulation of polymer spacer between AgNPs and fluorophores, the tunable MEF was achieved. It was also revealed that the fluorescent nanohybrids would exhibit maximal MEF when the polymerization degree was tuned to 350. The manipulation of the solution temperatures below and above LCST resulted in switchable MEF behavior. In addition, the phase transition process of the thermoresponsive copolymer was also studied by MEF effect using this fluorescent core–shell nanohybrid design. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52 , 87–95
研究领域:
材料科学
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纳米技术
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高分子化学
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物理化学
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光学
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表面科学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 19
·11742-11755
·
IF 10.733
Zhiming Li,Hua Tian,Yanyan Yuan,Xueqiong Yin,Xin Wei,Liwen Tang,Suying Wei
In this study, a novel gradient heating procedure was developed to fabricate the targeted metal-ion-imprinted thermo-responsive material, i.e. ion-imprinted thermo-responsive BC derivative (ITB), from bacterial cellulose using Cu2+ as a template and N-isopropylacrylamide (NIPAM) as a monomer; moreover, the structure and properties of ITB were analysed via various analytical techniques including FTIR spectroscopy, DSC, SEM, and Raman spectroscopy. The lower critical solution temperature (LCST) of ITB was 38.57 °C in the heating procedure, whereas it was 30.81 °C in the cooling procedure. The adsorption capacity of ITB for Cu2+ reached 95.20 mg g−1 at 45 °C (>LCST), the desorption rate was 98.81%, and desorption could be simply achieved by washing the adsorbents with water at 20 °C (
研究领域:
材料科学
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环境化学
·
分析化学
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产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2020
·Vol. 221
·期 9
·2000035
·
IF 2.335
Yu Wang,Alberto García-Peñas,Santiago Gómez-Ruiz,Florian J. Stadler
The functionalization of different structures with organometallic complexes provides exciting properties in terms of applicability due to its ability to provide multiple benefits for catalysis and biomedicine as well as in other fields. This work reports the direct, facile functionalization of copolymers based on N -isopropylacrylamide and dopamine methacrylamide with bis(cyclopentadienyl)titanium (IV) dichloride (Cp 2 TiCl 2 , Cp = η 5 -C 5 H 5 ), which can offer an easy preparation method in comparison with other functionalization procedures. In addition, the lower critical solution temperature (LCST) is studied through aqueous solutions of new structures, which is affected by the presence of the metallocene moieties. UV–vis spectroscopy shows an average of the LCST-behavior in comparison with rheology that provides essential information about the changes of the phase transition temperature associated with the composition of the polymeric chains and their interactions with the medium. Then, the inclusion of an organometallic complex along the polymeric chain can partially modify the phase transition temperature due to the interactions promoted by the organometallic complex of surroundings over the polymeric sections free of comonomer content.
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
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2014
·Vol. 25
·期 6
·613-623
·
IF 1.964
Yiting Xu,Jianjie Xie,Lingnan Chen,Hui Gao,Conghui Yuan,Cong Li,Weiang Luo,Birong Zeng,Lizong Dai
Organic/inorganic hybrid amphiphilic block copolymer poly(methacrylate isobutyl POSS)- b -poly( N -isopropylacrylamide- co -oligo(ethylene glycol) methyl ether methacrylate) (PMAPOSS- b -P(NIPAM- co -OEGMA)) was synthesized via reversible addition–fragmentation chain transfer polymerization. The self-assembly behavior of this block copolymer in aqueous solution was investigated by dynamic light scattering (DLS) and transmission electron microscopy. The results indicate that the novel block copolymer can self-assemble into spherical micelles with PMAPOSS segment as the hydrophobic part and P(NIPAM- co -OEGMA) segment as the hydrophilic part. The temperature-responsive characteristics of the assemblies were tested by UV–Vis spectra and DLS. Some factors such as the concentration, molecular weight, and copolymer generation that may affect the cloud point were studied systematically. The results reveal that this copolymer exhibits a sharp and intensive lower critical solution temperature (LCST). The essentially predetermined LCST can be conveniently achieved by adjusting the content of NIPAM or OEGMA domain. In addition, these novel hybrid micelles can undergo an association/disassociation cycle with the heating and cooling of solution and the degree of reversibility displaying a tremendous concentration dependence, as a novel organic/inorganic hybrid material with distinctive virtues can be potentially used in biological and medical fields, especially in drug nanocarriers for targeted therapy. Copyright © 2014 John Wiley & Sons, Ltd.
研究领域:
材料科学
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高分子化学
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纳米技术
·
生物医学工程
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Yaxin Hao,Minli Yang,Na Li,Yanfang Zhao,Yunshan Wang,Xiangfeng Chen,Feng Zhang
The thermal-responsive magnetic molecularly imprinted polymer (TrMMIP) sorbent was synthesized by surface imprinting method, and then used for magnetic solid-phase extraction (MSPE) and subsequent integrated into the ion source for elution and ionization. The shrinking-strength states change of the thermal-responsive polymer chain on TrMMIP alters the wettability of the sorbent when the working temperature crosses the lower critical solution temperature (LCST) of the polymer, and thus affects its behavior of in the extraction and clean-up process. The targeted analytes could be effectively extracted due to the high selectivity of MIPs and well dispersibility of polymer chain under the open state. Additionally, a hydrophilic polymer chain wrapped on the sorbent surface further protected target substances from co-elution during cleanup. Analytical methods for sulfonamide antibiotics (SAs) detection in complex food samples (milk, honey, fish) were developed, demonstrating potential for rapid and sensitive SAs analysis in diverse food and biological samples.
研究领域:
分析化学
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材料科学
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环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yanai Chen,Limin Chang,Ziheng Zhang,Min Zhou,Yuanwei Gao,Yong Wang,Yanfang Liu,Jianglei Qin
Thermo-responsive hydrogels with biodegradability have great application in biomedical areas, while the Poly(N-isopropylacrylamide) (PNIPAM) based hydrogels exhibiting lower critical solution temperature (LCST) around body temperature have shown promising applications in diverse areas such as drug delivery, tissue engineering, and wound repairing. In this study, PNIPAM based thermo-responsive copolymer with ketone functional group was polymerized and the LCST was regulated to body temperature, then biodegradable self-healing hydrogels with injectability were fabricated by cross-linking the thermo-responsive copolymers with dopamine functionalized pectin hydrazide (PDAH). The hydrogel exhibited good mechanical strength, excellent biocompatibility and thermo-responsive sustained drug release process. The nano-graphene oxide (GO) was incorporated to design near-infrared (NIR) sensitive nanocomposite hydrogel to serve as photothermal enhanced wound dressing with vancomycin loading. The composite hydrogel also showed pH-responsive drug release behavior and the NIR irradiation also accelerated the release rate based on photothermal induced phase transition. More importantly, the nanocomposite hydrogel with vancomycin loading and photothermal property can promoted burn wound repairing rate by inhibiting the bacterial growth. As a result, this GO composite hydrogel (GO/hydrogel) could act as NIR triggered photo-thermal enhanced drug delivery platform for promoted wound repairing in the near future.
研究领域:
材料科学
·
生物医学工程
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药学
·
组织工程
·
伤口愈合
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）