JOURNAL OF MATERIALS RESEARCH
·
2014
·Vol. 29
·期 22
·2694-2706
·
IF 1.815
Birong Zeng,Yueguang Wu,Qilong Kang,Ying Chang,Conghui Yuan,Yiting Xu,Feng-Chih Chang,Lizong Dai
Novel hybrid diblock copolymers consisting of bidentate ligand-functionalized chains have been synthesized via click reaction and RAFT radical polymerization. The chemical structure and molecular weight of the synthesized poly(methacrylate-POSS)-block-poly(4-vinylbenzyl-2-pyridine-1H-1,2,3-triazole) (PMAPOSS-b-PVBPT) were characterized by NMR and GPC. The copolymers had been utilized to construct metal-containing polymer micelle by the metal–ligand coordination and electrostatic interaction in this study. The self-assembly behaviors of PMAPOSS-b-PVBPT in chloroform, a common solvent, under the effect of Zn(OTf)2 and HAuCl4 were investigated by TEM, DLS, and variable temperature NMR. Besides, micellization of this diblock copolymer was achieved in ethylene glycol, a selective solvent for PMAPOSS-b-PVBPT. The experimental results revealed that the incorporation of heterocyclic rings bearing nitrogen atoms in polymer side chains played an important role in the construction of metal-containing copolymer micelles. The prepared metal-containing PMAPOSS-b-PVBPT micelles had good dynamic and thermal stability due to the strong metal–ligand coordination interaction and electrostatic interaction.
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
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Jun Li,Xiangbin Sun,Yaping Zhang,Tingjun Lu,Zeyuan Wang,Yufeng He,Rongmin Wang
Organic dyes pollution (especially methylene blue) in wastewater has seriously affected the livelihood and health of human beings. To address this issue, in this study, loess-based N-doped TiO 2 (NTiO 2 @ALS) photocatalysts were fabricated through in situ deposition of N-doped TiO 2 (NTiO 2 ) nanoparticles on the surface of acidified loess (ALS) particles by sol-gel method. The characterization was performed by XRF, SEM, FT-IR, XRD, XPS, UV–Vis DRS and BET, and small nanoparticles of NTiO 2 were found to be perfectly bound to the surface of the ALS particles. In addition, what factors affecting the photocatalytic activity were explored and it was found that calcination at 450 °C for 2 h was the best condition, under which the samples possessed the highest degradation efficiency under visible light irradiation. Furthermore, NTiO 2 @ALS was applied to the degradation of methylene blue (MB) and the mechanism of pre-adsorption and photocatalytic degradation was also investigated. Surprisingly, methylene blue (MB) could be degraded by 99.6% post pre-adsorption. This excellent result was attributed to the existence of dual coordination between catalytic active center (NTiO 2 ) and support (ALS) in NTiO 2 @ALS. Most significantly, the introduced ALS particles achieved the effective dispersion of small NTiO 2 nanoparticles and increased the specific surface area of materials, which greatly improved photocatalytic performance and adsorption properties. In brief, NTiO 2 @ALS holds promising application potential for the removal and degradation of organic dyes from wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Chen Yu,Zhenyi Jiang,Junyi Han,Chaojun Yue,Meng Wei,Wenqin Wang,Tao Chen,Wei Lu
With the growing demand for information security, luminescent hydrogels with time dependence are highly required. However, the insufficient encryption sophistication and poor rewritability still hinder their application exploration in various scenarios. Herein, reversible multi-responsive fluorescent hydrogels with time-dependent information displays are successfully developed based on a dynamic coordinated interaction strategy. The fluorescent hydrogels are prepared by penetrating pyridine-dihydrazone-crosslinked oxidized dextran into poly(vinyl alcohol) networks. Fluorescent quenching and enhancement are achieved by dynamically controlling the coordination interaction of pyridine-dihydrazone-based ligands with Fe 3+ and Zr 4+ via the intramolecular charge transfer (ICT) and coordination effect (CE) mechanism, respectively. Notably, distinct time-dependent fluorescent recoveries are found upon further treatment with H + , which is attributed to differential coordination energies of Fe 3+ and Zr 4+ with ligands. On the basis of multi-responsive distinct yet reversible fluorescence behavior, the encoded information loaded by Fe 3+ /Zr 4+ can be sequentially decrypted until erased under the treatment of H + over time. Moreover, excellent rewritability can be realized by the alternation of metal ions and acid. Ultimately, rewritable 2D and 3D anti-counterfeiting platforms with time dependence are established to improve the security level of information encryption. This work affords an inspiring approach to developing time-dependent information encoding systems with enhanced security and rewritability.
研究领域:
材料科学
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信息安全
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化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Guiliang Li,Jianrong Ye,Qile Fang,Fu Liu
Covalent organic frameworks (COFs) materials with designed skeleton structure and controlled pore size are a new class of adsorbent materials for environment remediation. Here, we synthesize two amide-based COFs materials via a polymerization reaction of acyl chloride and amino groups by mechanical ball milling at room temperature for Pb 2+ removal as adsorbents. Two types of diamine monomers are selected to construct COFs with different framework structure and functional groups contents, i.e. COF-TP from aromatic diamine and COF-TE from linear diamine. The as-prepared COFs materials display typical lamellar structure, and the amide groups on COFs skeleton are confirmed to behave as active adsorption sites for Pb 2+ capture via multi-coordination. COF-TE exhibits superior Pb 2+ adsorption capacity to COF-TP, because that less aromatic skeleton and weak π-π stacking of COF-TE facilitate higher internal diffusion of Pb 2+ adsorption. Meanwhile, the higher amide group content on COF-TE leads to its higher saturated adsorption capacity of 185.7 mg/g than COF-TP of 140.0 mg/g. Finally, great recycling stability of Pb 2+ adsorption allows the amide-based COFs materials to be promising adsorbents for heavy metal Pb 2+ removal or recovery.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2012
·
IF 3.898
Zhan Zhou,Qianming Wang
Here two novel terbium silica xerogels (H a and H b ) were assembled into cellulose hydrogels and two transparent films with narrow emission were successfully fabricated as fluorescent probes . We have found that the nitrite addition entailed efficient quenching effects of the photoluminescence intensity, contrasting the stable emissions upon exposure to other comparative ions (SO 4 2− , CO 3 2− , ClO 3 − , NO 3 − , AcO − , OH − , F − , Cl − , Br − , I − , K + , Na + , Fe 2+ , Mn 2+ , Pd 2+ , Cd 2+ , Co 2+ , Cu 2+ and Fe 3+ ). The recognition process may be ascribed to the coordination interaction between terbium ions and NO 2 − . Linear functions for spectroscopic titrations were obtained in both hydrogel-based films and the new soft sensors exhibit a dynamic range for determination of nitrite from 1 × 10 −5 to 1 × 10 −4 M.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 70
·17586-17594
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IF 5.236
Zi-Jian Li,Yu Ju,Zeya Zhang,Huangjie Lu,Yongxin Li,Ningjin Zhang,Xian-Long Du,Xiaofeng Guo,Zhi-Hui Zhang,Yuan Qian,Ming-Yang He,Jian-Qiang Wang,Jian Lin
Graphical The extraordinary coordination versatility of Th 4+ cation and the unexpected bridging role of formate allow polymorphism control of thorium-organic frameworks (TOFs) with five distinct phases, wherein the highest degree of interpenetration and porosity for TOFs have been achieved. The resulting TOFs exhibit considerably different adsorption behaviors toward organic dyes, thus suggesting that TOFs represent an excellent platform for structure-property relationship study. Polymorphism control of metal-organic frameworks is highly desired for elucidating structure-property relationships, but remains an empirical process and is usually done in a trial-and-error approach. We adopted the rarely used actinide cation Th 4+ and a ditopic linker to construct a series of thorium-organic frameworks (TOFs) with a range of polymorphs. The extraordinary coordination versatility of Th 4+ cations and clusters, coupled with synthetic modulation, gives five distinct phases, wherein the highest degree of interpenetration (threefold) and porosity (75.9 %) of TOFs have been achieved. Notably, the O atom on the capping site of the nine-coordinated Th 4+ cation can function as a bridging unit to interconnect neighboring secondary building units (SBUs), affording topologies that are undocumented for other tetravalent-metal-containing MOFs. Furthermore, for the first time HCOOH has been demonstrated as a bridging unit of SBUs to further induce structural complexity. The resulting TOFs exhibit considerably different adsorption behaviors toward organic dyes, thus suggesting that TOFs represent an exceptional and promising platform for structure-property relationship study.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 5
·317
·
IF 3.504
Zhichuan Shen,Hongjun Zhou,Huayao Chen,Hua Xu,Chunhua Feng,Xinhua Zhou
Salicylaldimine-modified mesoporous silica (Sal-MCM-3 and Sal-MCM-9) was prepared through a co-condensation method with different amounts of added salicylaldimine. With the coordination from the salicylaldimine, zinc ions were impregnated on Sal-MCM-3 and Sal-MCM-9. Then, Zn-Sal-MCM-3 and Zn-Sal-MCM-9 were calcined to obtain nano-zinc oxide loaded on mesoporous silica (ZnO-MCM-3 and ZnO-MCM-9). The material structures were systematically studied by Fourier transform infrared spectroscopy (FTIR), N2adsorption/desorption measurements, X-ray powder diffraction (XRD), zeta potential, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet diffused reflectance spectrum (UV-vis DRS), and thermogravimetry (TGA). Methyl orange (MO) was used to investigate the photocatalysis behavior of ZnO-MCM-3 and ZnO-MCM-9. The results confirmed that nano ZnO was loaded in the channels as well as the outside surface of mesoporous silica (MCM-41). The modification of salicylaldimine helped MCM-41 to load more nano ZnO on MCM-41. When the modification amount of salicylaldimine was one-ninth and one-third of the mass of the silicon source, respectively, the load of nano ZnO on ZnO-MCM-9 and ZnO-MCM-3 had atomic concentrations of 1.27 and 2.03, respectively. ZnO loaded on ZnO-MCM-9 had a wurtzite structure, while ZnO loaded on ZnO-MCM-3 was not in the same crystalline group. The blocking effect caused by nano ZnO in the channels reduced the orderliness of MCM-41. The photodegradation of MO can be divided in two processes, which are mainly controlled by the surface areas of ZnO-MCM and the loading amount of nano ZnO, respectively. The pseudo-first-order model was more suitable for the photodegradation process.Keywords:nano ZnO;mesoporous silica;salicylaldimine;coordination;photodegradation
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-11
·
IF 14.919
Wang Jia-Wei,Jiang Long,Huang Hai-Hua,Han Zhiji,Ouyang Gangfeng
The fulfillment of a high quantum efficiency for photocatalytic CO 2 reduction presents a key challenge, which can be overcome by developing strategies for dynamic attachment between photosensitizer and catalyst. In this context, we exploit the use of coordinate bond to connect a pyridine-appended iridium photosensitizer and molecular catalysts for CO 2 reduction, which is systematically demonstrated by 1 H nuclear magnetic resonance titration, theoretical calculations, and spectroscopic measurements. The mechanistic investigations reveal that the coordinative interaction between the photosensitizer and an unmodified cobalt phthalocyanine significantly accelerates the electron transfer and thus realizes a remarkable quantum efficiency of 10.2% ± 0.5% at 450 nm for photocatalytic CO 2 -to-CO conversion with a turn-over number of 391 ± 7 and nearly complete selectivity, over 4 times higher than a comparative system with no additional interaction (2.4%±0.2%). Moreover, the decoration of electron-donating amino groups on cobalt phthalocyanine can optimize the quantum efficiency up to 27.9% ± 0.8% at 425 nm, which is more attributable to the enhanced coordinative interaction rather than the intrinsic activity. The control experiments demonstrate that the dynamic feature of coordinative interaction is important to prevent the coordination occupancy of labile sites, also enabling the wide applicability on diverse non-noble-metal catalysts.
研究领域:
化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 1
·e70068
·
IF 3.4
Hailong Zhang,Ruimeng Li,Haishui Xu,Ling Quan,Chengyu Zhan,Peng Han,Kehan Xu,Yuping Tong
The accumulation of copper ions in the environment can devastate the ecological systems and threaten the health of organisms. Consequently, the development of effective adsorbents to extract Cu 2+ from aqueous solutions is urgently needed. Here, the Zeolitic Imidazolate Framework-8 (ZIF-8)/polyacrylonitrile (PAN) nanocomposite fibers were synthesized by electrospinning and further characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). ZIF-8 powders were uniformly distributed on the surface of the nanocomposite fibers, and amide CO NH bonds were formed between the NH 2 groups of ZIF-8 and the CO groups of PAN. The ZIF-8/PAN nanocomposite fibers demonstrated an exceptional Cu 2+ adsorption capacity of 275.7 mg g −1 at pH = 4.0. The adsorption process adhered to the pseudo-second-order kinetics and the Langmuir isotherm model. The adsorption mechanism, as conformed by FTIR and X-ray photoelectron spectroscopy (XPS) analysis, involves the coordination of the NH 2 and CO groups with Cu 2+ and the ion exchange processes between Cu 2+ and Zn 2+ for the nanocomposite fibers. This study provides a novel approach for the removal of Cu 2+ from aqueous solutions and addresses the challenge of recovering powder materials in wastewater treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zihan Tian,Shixiao Wang,Yilin Wu,Feng Yan,Shuhao Qin,Jingkui Yang,Jianxin Li,Zhenyu Cui
PVDF@TiO 2 NPs hybrid membranes with different hybrid modes were fabricated. The chemical structure , surface characteristic features and optical properties of the hybrid membranes were characterised. The effects of different hybrid modes on photocatalytic performance are discussed for the first time. The results indicated that the membrane with both chemical bonding and coordination between TiO 2 NPs and polymer matrix showed the best photocatalytic performance. Furthermore, the aggregation tendency of TiO 2 NPs on the hybrid membrane surface was effectively suppressed and the band gap of TiO 2 NPs was significantly reduced. The photogenerated electron-hole recombination rate was significantly decreased by the strongly electronegative fluorine (F), carboxyl and ester groups. Additionally, the negatively charged carboxyl groups on the surface of hybrid membrane facilitated the adsorption of methylene blue (MB) dye and promoted the adsorption-photocatalytic degradation of the MB. The photocatalytic degradation efficiency ( η ) of MB was higher than 95.4% and the η remained greater than 90% after 5 recycling cycles. Compared with membranes prepared by dip coating or blending, the grafted membrane exhibited higher degradation efficiency and improved recyclability. Therefore, this membrane provided a simple method for preparing stable hybrid membranes with better photocatalytic performance.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Wei Zhao,Hui Liu,Lijie Duan,Guanghui Gao
In this work, carboxylic groups were introduced to latex microspheres (LMs) to obtain poly(styrene-butyl acrylate) (P(St-BA)-COOH) LMs with negative charges by a soap-free emulsion polymerization method. Then P(St-BA)-COOH LMs were added into an aqueous solution composed of acrylamide (AAm) and acrylic acid (AAc). The P(AAm-co-AAc)-MBA/LMs hydrogel was fabricated after adding redox initiators and N,N’-methylene diacrylamide (MBA) as covalent crosslinker by a free radical copolymerization. Subsequently, P(AAm-co-AAc)-MBA/LMs hydrogels were soaked into a ferric solution to achieve a tough hybrid hydrogel with covalent crosslinking and ionic coordination interaction between ferric ions and negative carboxylic groups arising from LMs and P(AAm-co-AAc) chains. The resultant P(AAm-co-AAc)-MBA/LMs-Fe 3+ hydrogels possessed high fracture stress of 1440 kPa, large strain of 1140% and fracture energy of 6983 kJ/m 3 . This would help us to deeply understand the relationship between the structure and performance of LMs-reinforced hydrogels.
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
REACTIVE & FUNCTIONAL POLYMERS
·
2021
·
IF 3.975
Qichao Fan,Guanglin Wang,Da Tian,Anyao Ma,Wenxiang Wang,Liangjiu Bai,Hou Chen,Lixia Yang,Huawei Yang,Donglei Wei,Zhenglong Yang
Recently years, hydrogels have received increased attention due to their promising applications in wound dressing, tissue engineering, biosensors and human-machine interfaces. However, designing hydrogels with good mechanical strength and self-healing ability remains a challenge. As a novel strategy, functional Janus nanosheets (JNs) were used as reinforcement to develop self-healing nanocomposite hydrogels. Herein, the silica Janus hollow spheres were prepared by a sol-gel process, modified with poly(2-(acryloyloxy)ethyl ferrocenecarboxylate)(PMAEFc)/polydopamine(PDA) to the internal/external surfaces and then crushed to fabricate the SiO 2 @PMAEFc/PDA JNs. The SiO 2 @PMAEFc/PDA JNs were then used as robust reinforcement to design self-healing nanocomposite hydrogels. Based on multiple effects of metal–coordination and host–guest interactions, the mechanical strengths and self-healing properties of hydrogels were both enhanced. Specially, after introducing JNs, the rupture stress of hydrogels increased from 1.27 MPa to 2.23 MPa, and the self-healing efficiency improved from 66.7% to 92.4%. These results demonstrate that JNs can be used as robust reinforcement to fabricate self-healing nanocomposite hydrogels, which enriches the design of self-healing hydrogels and broadens the application prospects of Janus nanomaterials .
研究领域:
材料科学
·
生物医学工程
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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）