APPLIED SURFACE SCIENCE
·
2009
·
IF 1.576
J.C. Chen,W.Q. Luo,H.D. Wang,J.M. Xiang,H.F. Jin,F. Chen,Z.W. Cai
A versatile method was developed for the chain-end functionalization of the grafted polymer chains for surface modification of nanoparticles with functionalized groups through a combination of surface-initiated atom-transfer radical polymerization (ATRP) and Huisgen [3 + 2] cycloaddition. First, the surface of SiO 2 nanoparticles was modified with poly(methyl methacrylate) (PMMA) brushes via the “grafting from” approach. The terminal bromides of PMMA-grafted SiO 2 nanoparticles were then transformed into an azide function by nucleophilic substitution. These azido-terminated PMMA brushes on the nanoparticle surface were reacted with alkyne-terminated functional end group via Huisgen [3 + 2] cycloaddition. FTIR and 1 H NMR spectra indicated quantitative transformation of the chain ends of PMMA brushes onto SiO 2 nanoparticles into the desired functional group. And, the dispersibility of the end-functional polymer-grafted SiO 2 nanoparticles was investigated with a transmission electron microscope (TEM).
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Xiaofei Li,Xiao Wang,Yukun Yuan,Mingyuan Wu,Qingyun Wu,Jiuyi Liu,Jianjun Yang,Jianan Zhang
A facile approach to prepare sprayable, durable, and superhydrophobic coating was designed for highly efficient oil/water separation and oil absorption based on silica particle brushes via surface-initiated (SI-ATRP). Octadecyl group bonded and poly(styrene-co-acrylonitrile) (PSAN) grafted silica nanoparticles (NPs) (C18-SiO 2 -g-PSAN) were prepared by sequential initiator tethering and SI-ATRP processes, which were directly applied as surface superhydrophobic coating for various porous substrates. The results confirmed that octadecyl group and PSAN were successfully bonded on silica NPs. After facile spraying of C18-SiO 2 -g-PSAN, the coated porous substrates displayed superhydrophobicity with an advancing water contact angle (WCA) exceeding 150° due to the synergistic effects of low surface energy compositions contributed by the tethered octadecyl group and the rough structure induced by silica NPs and porous substrates. Superhydrophobic porous substrates exhibited high oil/water separation efficiency achieving 98.8% by using cotton fabric as substrate and remarkable oil absorption capacity of 39.2 g/g for isooctane using polyurethane sponge as substrate. The recyclability and strong durability against mechanical abrasion enable them to be promising candidates for industrial oil-contaminated water treatments and marine spilt oil cleanup in harsh environments.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Xiang Xu,Junjie He,Yanning Zeng,Caili Yu,Faai Zhang
The surface-initiated metal-free atom transfer radical polymerization (ATRP) solution polymerization of methyl methacrylate was carried out for the first time on the basis of the reductive quenching mechanism. In this study, the 2-bromoisobutyryl bromide (BiBB) was anchored on the surface of self-synthesized rod-like mesoporous material SBA-15 as the initiator, with the commercially available organic dye fluorescein (FL) as photocatalyst and triethylamine (TEA) as electron donor under the irradiation of blue lamp. The obtained composites and polymers were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, N 2 adsorption/desorption measurements, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and gel permeation chromatography. The results demonstrated that the ordered mesoporous structure of SBA-15 was not disrupted after the polymerization. With an increase in illumination time, the grafting amount and the number average molecular weight of poly(methyl methacrylate) (PMMA) on the surface of SBA-15 linearly increased, and the molecular weight distribution ( Đ ) widened. PMMA with a relatively narrow Đ value was obtained after polymerization for 10 h (1.47). The increase in the grafting amount and molecular weight after chain extension confirmed the chain end functionality of PMMA grafted on SBA-15.
研究领域:
高分子化学
·
材料科学
·
纳米技术
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表面工程
·
光化学
✓ 已验证
DOI
高影响因子
Theranostics
·
2020
·
IF 8.579
Chaoli Wang,Peng Chen,Youbei Qiao,Yuan Kang,Chaoren Yan,Zhe Yu,Jian Wang,Xin He,Hong Wu
Background : Biofilm infection caused by multidrug-resistant bacteria is difficult to eradicate by conventional therapies. Photodynamic therapy (PDT) is an effective antibacterial method for fighting against biofilm infection. However, the blocked photosensitizers outside of biofilm greatly limit the efficacy of PDT. Methods : Herein, a novel acid-responsive superporogen and photosensitizer (SiO 2 -P Ce6-IL ) was developed. Because of the protonation of the photosensitizer and the high binding energy of the polyionic liquid, SiO 2 -P Ce6-IL changed to positive SiO 2 -P IL + in an acidic microenvironment of biofilm infection. SiO 2 -P IL + could combine with negatively charged extracellular polymeric substances (EPS) and create holes to remove the biofilm barrier. To strengthen the interaction between SiO 2 -P IL + and EPS, SiO 2 -P IL + of high charge density was prepared by grafting the high-density initiation site of ATRP onto the surface of the SiO 2 base. Results : Due to the rapid protonation rate of COO - and the strong binding energy of SiO 2 -P IL + with EPS, SiO 2 -P Ce6-IL could release 90% of Ce6 in 10 s. With the stronger electrostatic and hydrophobic interaction of SiO 2 -P IL + with EPS, the surface potential, hydrophobicity, adhesion and mechanical strength of biofilm were changed, and holes in the biofilm were created in 10 min. Combining with the release of photosensitizers and the porous structure of the biofilm, Ce6 was efficiently concentrated in the biofilm. The in vitro and in vivo antibacterial experiments proved that SiO 2 -P Ce6-IL dramatically improved the PDT efficacy against MRSA biofilm infection. Conclusion : These findings suggest that SiO 2 -P Ce6-IL could rapidly increase the concentration of photosensitizer in biofilm and it is an effective therapy for combating biofilm infection.
研究领域:
材料科学
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纳米技术
·
生物医学工程
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微生物学
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药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Xiaoling Xu,Bin Peng,Yanqiu Wang,Yaqi Dong,Hui Wang,Wentong Chen,Yan Liu,Qiang Zhang
The incorporation of polyhedral oligomeric sesquisiloxane (POSS), a distinctive nanoparticle, into the membrane separation layer represents an effective strategy for enhancing the chlorine resistance of membranes. This modification contributes to both the durability of the membrane and its separation efficiency. However, POSS is easy to agglomerate, which affects the separation performance of the membrane. In this paper, POSS-centered polyhydroxy polymer (OMEPOSS-P(GMA-NMDG)) was synthesized via photo-induced atom transfer radical polymerization and used as water-soluble monomer to prepare polyester separation layer on porous substrates through interfacial polymerization with trimelanoyl chloride. The obtained POSS-centered polyester membrane exhibits a high dye removal rate exceeding 99 %, and it can realize the screening of dye molecules with different molecular weight and different charge. Notably, the membrane demonstrates excellent chlorine resistance, maintaining effective separation efficiency after exposure to sodium hypochlorite solutions at concentrations of 10 000 ppm for 96 h and 1000 ppm for 7 days. It is worth noting that the membrane showed high anti-fouling performance. This method provides a useful guideline for the development of chlorine-resistant and anti-fouling separation membranes.
研究领域:
材料科学
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分离技术
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2019
·Vol. 304
·期 8
·1900176
·
IF 3.038
Shixin Song,Shan Xia,Yingcong Wei,Xue Lv,Shulin Sun,Quanming Li
Poly(methyl methacrylate)-grafted carbon nanotubes (PMMA@MWCNTs) are nondestructively prepared via the integration of mussel-inspired polydopamine (PDA) chemistry and the surface-initiated atom transfer radical polymerization (ATRP) method. The structures and properties of the poly(vinylidene fluoride)-based (PVDF-based) nanocomposites filled with pristine MWCNTs and PMMA@MWCNTs are investigated. The results show that the encapsulation of PMMA on the MWCNTs surface not only improves the dispersibility of MWCNTs in the PVDF matrix but also enhances the interfacial interaction between MWCNTs and PVDF. The addition of PMMA@MWCNTs nanofillers to PVDF can effectively induce the crystal structure of PVDF to transform from the α-phase to the β/γ -phase, and nearly 100% β/γ -phase PVDF formed when the nanofiller loading is higher than 5 wt%. Compared with the MWCNTs/PVDF composites, the PMMA@MWCNTs/PVDF composites exhibit obvious improvement in the percolation threshold because the PMMA shells hinder the direct contact of the MWCNTs. Moreover, the loss tangent of the PMMA@MWCNTs/PVDF composites is effectively suppressed due to the reduced leakage current in the composites and the enhanced interfacial strength between the nanofiller and the matrix.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2018
·Vol. 27
·期 11
·881-887
·
IF 1.278
Zeng Le-Lin,Xie Wan-Yun,Yang Cai-Xia,Liang Enxiang,Wang Guo-Xiang
In this study, a novel photocatalyst, pentarylenebis(dicarboximide) dye: (1,6,13,18-tetra(4-(2,3,3-trimethylbut-2-yl)phenoxy)- N,N ’-(2,6-diisopropylphenyl)-pentarylene-3,4,15,16-tetracarboxidiimide) (TTPDPT), was first used in metal-free photoinduced atom transfer radical polymerization (ATRP) of methyl methacrylates (MMA). The initiator was methyl α-bromoisobutyrate (MBI) and the light source was mild near-infrared (NIR) light irradiation ( λ max ≈ 870 nm). The TTPDPT-mediated ATRP relies on in situ photoreduction of a MBI through an electron transfer process to generate the desired alkyl radical, which could induce polymerization of the monomer. The photoinduced metal-free ATRP of MMA shows typical characteristics of controlled free radical polymerization, showing the linear evolution of number-average molecular weight ( M n,GPC ) with monomer conversion, where polymers with predetermined degree of polymerization have well-controlled molecular weights and narrow molecular weight distribution ( M w / M n ). The photoinduced metal-free ATRP of MMA can be carried out with just ppm level of TTPDPT. The polymerization initiation and propagation can be operated by the aid of pulsed light sequences while NIR light source was used to promote carbon–carbon bond formation and to produce poly(methyl methacrylate) (PMMA) with M w / M n as low as 1.5. The synthesized PMMA was characterized by 1 H nuclear magnetic resonance ( 1 H NMR). The resultant PMMA contained a bromide end group that can be employed to reinitiate styrene polymerization to produce block copolymers through chain extension experiments.
研究领域:
高分子化学
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材料科学
·
光化学
✓ 已验证
DOI
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2015
·
IF 0.669
Wenming Yang,Yang Cao,Xiaoni Ni,Weihong Hunag,Wanzhen Xu
We herein report the successful synthesis of molecularly imprinted polymers (MIPs) by surface imprinting methods. The synthesized MIPs were subsequently used to selectively adsorb indole from fuel oil. A new polymerization method (SR&NI ATRP), which combines the atom transfer radical polymerization (ATRP) and reverse atom transfer radical polymerization methods, is applied for the preparation of indole–MIPs. The indole–MIPs prepared have large specific surface area and porosity, as revealed by a series of morphology characterization studies. Static adsorption data indicate that the adsorption capacity of indole–MIPs was 55.8 mg g−1, and the adsorption equilibrium is achieved in 120 minutes. According to the results of thermodynamic analysis, the adsorption process is spontaneous. In addition, results of kinetics analysis indicated that the adsorption performances of indole–MIPs obey pseudo-second-order model. The Sips and Langmuir equations better fitted with the experimental isothermal data than the Freundlich equation. The selectivity of indole–MIPs was significant and the adsorbent could be reused even after five regeneration cycles.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Chaoqun Dong,Huiyu Wang,Zhuo Zhang,Tao Zhang,Baorui Liu
Circulating tumor cells (CTC) capture is one of the most effective approaches in diagnosis and treatment of cancers in the field of personalized cancer medicine. In our study, zwitterionic carboxybetaine methacrylate (CBMA) oligomers were grafted onto nylon via atomic transfer random polymerization (ATRP) which would serve as a novel material for the development of convenient CTC capture interventional medical devices. The chemical, physical and biological properties of pristine and modified nylon surfaces were assessed by Fourier transform infrared spectra, atomic force microscope, water contact angle measurements, X-ray photoelectron spectroscopy, protein adsorption, platelet adhesion, and plasma recalcification time (PRT) determinations, etc. The results, including the significant decrease of proteins adsorption and platelets adhesion, as well as prolonged PRTs demonstrated the extraordinary biocompatibility and blood compatibility of the modified surface. Furthermore, we showed that upon immobilization of anti-epithelial cell adhesion molecular (anti-EpCAM) antibody onto the CBMA moiety, the modified nylon surface can selectively capture EpCAM positive tumor cells from blood with high efficiency, indicating the potential of the modified nylon in the manufacture of convenient interventional CTC capture medical devices.
研究领域:
生物医学工程
·
癌症研究
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-9
·
IF 6.232
Zhang Xiaoxia,Wu Dan,Shen Jiwei,Wei Yinmao,Wang Chaozhan
An immobilized metal affinity (IMA) adsorbent was prepared by grafting bottlebrush polymer pendant with iminodiacetic acid (IDA) from the surface of polydopamine (PDA)-coated magnetic graphene oxide (magGO), via surface-initiated atom transfer radical polymerization (SI-ATRP). Poly(hydroxyethyl methacrylate) (PHEMA) was grafted firstly from the PDA-coated magGO as the backbone, and then poly(glycidyl methacrylate) was grafted from the PHEMA chains via the second SI-ATRP to afford the bottlebrush polymer–grafted magGO Thereafter, IDA was anchored on the nanocomposites to produce the IMA adsorbent after chelating copper ions. The adsorbent was characterized by various physical and physicochemical methods. Its adsorption properties were evaluated by using histidine-rich proteins (bovine hemoglobin, BHb) and other proteins (lysozyme and cytochrome-C). The results show that its maximum adsorption capacity to BHb was 378.6 mg g −1 , and the adsorption equilibrium can be quickly reached within 1 h. The adsorbent has excellent reproducibility and reusability. It has been applied to selectively purify hemoglobin from human whole blood, indicating its potential in practical applications.
Graphical abstract
研究领域:
材料科学
·
生物医学工程
·
化学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 412
·期 17
·4155-4163
·
IF 3.637
Li Jinge,Zhao Liying,Wen Dongxiao,Li Xiaofei,Yang Huaixia,Wang Dazhong,Kong Jinming
In this work, a new method of CYFRA21-1 DNA (tDNA) detection based on electrochemically mediated atom transfer radical polymerization (e-ATRP) and surface-initiated reversible addition-fragmentation chain transfer polymerization (SI-RAFT) cascade polymerization and AgNP deposition is proposed. Firstly, the peptide nucleic acid (PNA) probe is captured on a gold electrode by Au-S bonds for specific recognition of tDNA. After hybridization, PNA/DNA strands provide high-density phosphate groups for the subsequent ATRP initiator by the identified carboxylate-Zr 4+ -phosphate chemistry. Then, a large number of monomers are successfully grafted from the DNA through the e-ATRP reaction. After that, the chain transfer agent of SI-RAFT and methacrylic acid (MAA) are connected by recognized carboxylate-Zr 4+ -carboxylate chemistry. Subsequently, through SI-RAFT, the resulting polymer introduces numerous aldehyde groups, which could deposit many AgNPs on tDNA through silver mirror reaction, causing significant amplification of the electrochemical signal. Under optimal conditions, this designed method exhibits a low detection limit of 0.487 aM. Moreover, the method enables us to detect DNA at the level of PCR-like and shows high selectivity and strong anti-interference ability in the presence of serum. It suggests that this new sensing signal amplification technology exhibits excellent potential of application in the early diagnosis of non-small cell lung cancer (NSCLC).
Electrochemical detection principle for CYFRA21-1 DNA based on e-ATRP and SI-RAFT signal amplification technology.
研究领域:
生物化学
·
分析化学
·
癌症诊断
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Liu Yang,Jiachen Guo,Ling Zhang,Chunzhong Li
The rapid development of integrated circuits and micro-devices has brought serious thermal failure and huge fire hazards to polymer composites due to the inefficient heat dissipation. Here, in order to simultaneously achieve the excellent thermal conductivity (TC) and flame retardancy (FR) of composites, we proposed a strategy of grafting a flame retardant on the surface of an exfoliated boron nitride nanosheet (BNNS). Briefly, the atom transfer radical polymerization (ATRP) reaction was initiated on the surface of the BNNS with predeposited polydopamine to obtain poly(glycidyl methacrylate) (PGMA) chain with high graft density, and then the flame-retardant molecule 6H-dibenz(C,E)(1,2)oxaphosphorin-6-oxide (DOPO) was further decorated to form a flame-retardant functionalized BNNS with branched structure. Due to the improvement of interfacial compatibility, the BNNS exhibits uniform dispersion and robust interfacial interaction with the epoxy resin (EP), which will further promote the formation of heat conduction paths and the reduction of interfacial thermal resistance (Rb). In particular, the EP composite containing 30 wt % BNNS-DOPO exhibits a TC of 1.25 W/m·K, exceeding that of the composite loaded with serious aggregated BNNS by 32%. Simultaneously, the EP composite with only 20 wt % BNNS-DOPO presents a superior FR with an obvious decrease in the values of peak heat release rate (PHRR), total heat release (THR), smoke production rate (SPR), and total smoke production (TSP) compared to EP, corresponding to a reduction of 47.6, 44.7, 46.5, and 50%, respectively. The enhanced FR is mainly ascribed to the catalytic carbonization of DOPO, and the continuous and compact protective layer formed by the char combined with the BNNS effectively prevents the exchange of heat, oxygen, and volatile gases. Therefore, this surface modification strategy of the BNNS provides a new idea for exploring thermally conductive and flame-retardant composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）