ChemistrySelect
·
2022
·Vol. 7
·期 44
·e202203402
·
IF 2.307
Xiaoying Ma,Lei Shi,Yao Fu,Buyue Zhang,Xiufeng Zhang
Graphical The cyclic induction of H-aggregates and J-aggregates can be achieved by adding rare earth ions, methanol and EDTA to the MTC solution. The intuitive color expression can be used as a La 3+ detection switch. In recent years, the assembly of cyanine dye supramolecular aggregates has been a very important task because its photophysical and photochemical properties are widely used in many scientific fields, such as, materials, biomedical and industrial. In this work, H- and J-aggregates of cyanine dyes were constructed under controllable conditions, and a simple method was developed to achieve cycle induction around these aggregates which induced by rare earth ions, and the process can be repeated for many cycles. Assembly and circulation induce these aggregates to be easy to manipulate and identify, which can be directly observed with the naked eye. This simple supramolecular assembly provides another direction in the field of sensors, while bringing a new idea to the control of supramolecular aggregates.
研究领域:
材料科学
·
生物医学
·
工业化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 7
·5750-5758
·
IF 3.086
Yinghui Bian,Jinshe Chen,Shaotang Xu,Yulu Zhou,Lijun Zhu,Yuzhi Xiang,Daohong Xia
Two novel metal-free phthalocyanines have been designed and synthesized, namely tetra{[1H-benzo(d)imidazol-2-yl]thiol}phthalocyanine (TBIT-Pc) and tetra{[benzo(d)thiazol-2-yl]thiol}phthalocyanine (TBTT-Pc). These two compounds showed similar structures, while imidazolyl-NH in the substitutes of TBIT-Pc could form more hydrogen bonds. TBIT-Pc and TBTT-Pc were fully characterized by elemental analysis, 1H NMR, MALDI-TOF MS, FT-IR and the UV-Vis absorption spectrum. The self-assembly properties of TBIT-Pc and TBTT-Pc were comparatively studied. TBIT-Pc and TBTT-Pc were present as monomers in DMF in the concentration range of 9.04–20.3 μM. Depending mainly on the intermolecular hydrogen bonding (N–H⋯N) between benzimidazole substitutes, “head-to-tail” J-aggregates of TBIT-Pc were formed in DMSO, while there was no aggregation of TBTT-Pc in the same solvent. “Face-to-face” H-aggregates of TBIT-Pc and TBTT-Pc were formed with the addition of water to the solutions of DMSO, and the degree of aggregation increased with the introduction of H-bonds (N–H⋯N) in the benzimidazole substitutes of TBIT-Pc. The atomic force microscope (AFM) image and dynamic light scattering (DLS) displayed the formation of well-defined nanoparticles with a diameter of ca. 30 ± 15 nm with J-type aggregation of TBIT-Pc. And the dendritic nanostructures with H-aggregates of TBIT-Pc and TBTT-Pc with different size were observed from transmission electron microscopy (TEM) images. The possible mechanism of the effect of H-bonds on the formation of J-aggregates of TBIT-Pc and the H-aggregation of TBIT-Pc and TBTT-Pc was also discussed. In the formation process of aggregates, H-bonds and π–π interaction may be the dominant factors. In addition, the nanostructures fabricated from TBIT-Pc and TBTT-Pc showed good semiconducting properties revealed by current–voltage measurements.
研究领域:
超分子化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 12
·11611-11619
·
IF 2.76
Miao Lingzhan,Wang Chao,Hou Jun,Wang Peifang,Ao Yanhui,Li Yi,Lv Bowen,Yang Yangyang,You Guoxiang,Xu Yi
The stability of CuO nanoparticles (NPs) is expected to play a key role in the environmental risk assessment of nanotoxicity in aquatic systems. In this study, the effect of alginate (model polysaccharides) on the stability of CuO NPs in various environmentally relevant ionic strength conditions was investigated by using time-resolved dynamic light scattering. Significant aggregation of CuO NPs was observed in the presence of both monovalent and divalent cations. The critical coagulation concentrations (CCC) were 54.5 and 2.9 mM for NaNO 3 and Ca(NO 3 ) 2 , respectively. The presence of alginate slowed nano-CuO aggregation rates over the entire NaNO 3 concentration range due to the combined electrostatic and steric effect. High concentrations of Ca 2+ (>6 mM) resulted in stronger adsorption of alginate onto CuO NPs; however, enhanced aggregation of CuO NPs occurred simultaneously under the same conditions. Spectroscopic analysis revealed that the bridging interaction of alginate with Ca 2+ might be an important mechanism for the enhanced aggregation. Furthermore, significant coagulation of the alginate molecules was observed in solutions of high Ca 2+ concentrations, indicating a hetero-aggregation mechanism between the alginate-covered CuO NPs and the unabsorbed alginate. These results suggested a different aggregation mechanism of NPs might co-exist in aqueous systems enriched with natural organic matter, which should be taken into consideration in future studies.
Hetero-aggregation mechanism of CuO nanoparticles and alginate under high concentration of Ca 2+
研究领域:
环境科学
·
纳米毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2015
·Vol. 22
·期 3
·1-7
·
IF 1.92
Ji Yanfeng,Kang Wanli,Liu Shuren,Yang Runmei,Fan Haiming
An amphiphilic polymer in water could form an aggregate due to its hydrophobic groups. The rheological properties of the three amphiphilic polymers’ solutions are different because of their different hydrophobic groups. By using a rheometer and a rotatory viscometer, the rheological properties and apparent viscosities of three kinds of amphiphilic polymers have been studied. The results show that all of the polymers are Newtonian fluids at a low shearing rate and pseudoplastic fluids at a high shearing rate. In addition, the amphiphilic polymer-P(AM/BHAM/NaA) has the best thickening behavior and the lowest value of critical aggregation concentration (CAC), which was also verified by fluorescence spectroscopy. By combining creep-recovery with cohesive energy calculation, the structural performance and interaction energy of the aggregate is the reason for the above mentioned phenomenon. By increasing the strength of hydrophobic groups, i.e., with an oil–water partition coefficient, then the structural viscoelasticity of the groups could be improved, and the associate is easily formed in the solution.
研究领域:
高分子化学
·
物理化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Chun-Tao Li,You-Liang Xu,Jian-Gong Yang,Yong Chen,Hyeong Seok Kim,Qian-Yong Cao,Jong Seung Kim
A novel tetraphenylethene-based probe bearing bis-imidazolium anion donors is herein reported for pyrophosphate anion recognition. This probe can self-assemble finite, small sphere nanoaggregates with very weak emission in aqueous solution, and changes into large rod-like nanoaggregates with strong aggregation-induced emission upon binding with the pyrophosphate anion.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Cheng-Long Shen,Qing Lou,Kai-Kai Liu,Guang-Song Zheng,Run-Wei Song,Jin-Hao Zang,Lin Dong,Chong-Xin Shan
Control of aggregation plays an important role in the photophysical behavior of luminescent nanomaterials . Herein, the concentration-dependent self-assembled hybrid of carbon nanodots (CDs) with the alteration spectral characters of H-/J-aggregation were observed. In detail, the CDs aging under different conditions presented obvious spectral variations ranging from visible to near-infrared regions, accompanied by the spontaneous evolution of nanoaggregates from CD nanoparticles . Theoretical calculations and experimental results confirmed the inhomogeneous surface functional groups could render CDs into nanoaggregates with the H- or J-aggregation through intraparticle or interparticle interaction, inducing the discrepant surface-confined charges in these intraparticle nanoaggregates and further contributing to their shift of absorption and emission bands. With the novel aggregation regulation, the CDs exhibited a tunable increase in their photothermal and photodynamic capability in comparison to their original counterparts. These findings shed a new light on the understanding of the photophysical behaviors for the self-assembled hybrid of CDs with the concept of supramolecular engineering.
研究领域:
纳米材料科学
·
超分子工程学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF BIOMATERIALS APPLICATIONS
·
2015
·
IF 2.197
Yan-Ling Luo,Yuan Wang,Xuan Wang,Feng Xu,Ya-Shao Chen
Tribrachia star-shaped random copolymers with tunable thermosensitive phase transition temperature were designed and synthesized via a simple one-pot ammonolysis reaction approach with trimesic acid as cores. The self-assembly micellization behavior of the copolymers in aqueous solution was examined by surface tension, UV–vis transmittance, transmission electron microscope, and dynamic light scattering measurements, etc. The results indicated that the resultant copolymers formed thermosensitive micelle aggregates through hydrophobic interactions among the isopropyl groups of poly(N-isopropylacrylamide) PNIPAM chains and inter-star association at a polymer concentration above critical aggregation concentrations from 4.06 to 6.55 mg L−1, with a cloud point range from 36.6℃ to 52.1℃, and homogeneously distributed micelle size below 200 nm. The arm length and the compositional ratios of the two comonomers had effect on physicochemical properties of the polymer micelle aggregates. Particularly, the cloud point values were enhanced as the (N,N-dimethylacrylamide) DMAM monomer was introduced and reached to 36.6℃ and 41.0℃–44.7℃ when the mass ratio of NIPAM to DMAM was 90:10 and 80:20, respectively. The thermo-triggered drug release and cytotoxicity were evaluated to confirm the applicability of the random copolymer micelle aggregates as novel drug targeted release carriers.
研究领域:
材料科学
·
药学
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2021
·
IF 4.051
Denghui Li,Lian Liu,Honggao Yang,Jie Ma,Huiling Wang,Jiamin Pan
A novel-fluorescent sensor named TPAPI, is designed and constructed successfully. In DMSO/H 2 O (pH = 7.4) system, the TPAPI sensor demonstrates two different fluorescent responsive properties with the water volume fraction ( f w ): At 90%, the TPAPI shows an aggregation induced emission (AIE) effect around 670 nm, and can be used as a turn-off sensor; Meanwhile, at 10%, based on the fluorescent property of titration product, the aggregation caused quenching (ACQ) type fluorescent sensor can be constructed around 470 nm with LOD at 1.37 × 10 −7 mol·L −1 . The TPAPI sensor exhibits outstanding selectivity, anti-interference for hydrazine among thirty molecules and ions. The sensing mechanism is attributed to the formation of hydrazone (TPAP-N 2 H 4 ), confirmed by LC-MS. Theoretical calculations further confirm TPAPI molecules possess AIE property and TPAP-N 2 H 4 has the ACQ character. In addition, the TPAPI test strip can be prepared and applied successfully for the detection of N 2 H 4 .
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Xuechun Ding,Shengchao Wei,He Bian,Lijun Zhu,Daohong Xia
Despite the studies on asphaltene aggregation throughout few decades, the formation of asphaltene aggregates and subsequent deposition are still the biggest challenges in the oil industry. Especially, the role of porphyrins existing in oil naturally on asphaltene aggregation is not completely understood due to asphaltene’s and porphyrin’s special structures. Herein, we investigated the influence of tetraphenylporphyrin (TPP), nickel tetraphenylporphyrin (NiTPP), and vanadium tetraphenylporphyrin (VOTPP) on asphaltene aggregation by a multiscale approach, which provides an in-depth understanding of the role of porphyrins on asphaltene aggregation. UV–vis spectroscopy and fluorescence spectroscopy were performed to examine the self-aggregation of TPP, NiTPP, and VOTPP and the influence of porphyrins on the aggregation of asphaltene. The changes of stacking structures, microscopic structures, and particle size distributions of co-aggregates of asphaltenes with porphyrins were analyzed in detail via X-ray diffraction, inverted fluorescence microscopy, and granulometric distribution, respectively. The characterization results indicated that the aggregation ability of the porphyrins (TPP, NiTPP, and VOTPP) was stronger than that of asphaltene and porphyrins can promote the aggregation of asphaltene, which leads to the increase of the average aromatic sheet number, aggregation morphology, and particle size of asphaltene aggregates. Based on experimental analysis, the possible mechanism by which porphyrins promoted asphaltene aggregation was elucidated. This research provided new insights into the aggregation and disaggregation of asphaltenes.
研究领域:
石油化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Lihua Liu,Wenhan Jin,Yanan Huang,Jianan Dai,Xuwei Zheng,Yu Liu,Minzi Ju,Baoxing Shen
Many incurable or unmanageable human protein conformational diseases are associated with the misfolding or aggregation of the aberrantly processed or mutant proteins . In this work, we report an aggregation-induced emission (AIE) derivative of fluorescent protein chromophore used to detect the insoluble protein aggregates in live cells. Based on the 4-hydroxybenzylidene-imidazolinone (HBI), we designed and synthesized a series of AIEgens that span a wide range of viscosity coefficients (χ), thus mimicking the viscous microenvironment of a wide variety of amorphous protein aggregates. The mechanism of these AIEgens were systematically investigated using a combination of photophysical studies, computational analyses and structure-function studies. With the aid of the AggTag method, the optimized probe was used to realize the imaging of the aggregated proteome under the control of the proteostasis network. Besides, we also described the formation and decomposition of protein aggregates under the control of small molecule proteostasis regulators. Briefly, we developed a series of AIEgens that explore varying viscosity sensitivities to visualize protein aggregation in live cells as well as study other biological processes that associated with local viscosity changes.
研究领域:
生物化学
·
分子生物学
·
医学
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2022
·Vol. 76
·期 11
·6879-6889
·
IF 2.146
Yan Nana,Wang Qiaoling,Chen Kaimin,Qu Yi,Wen Shaoguo
At present, there is a serious challenge to prepare fluorescent nanoparticles with excellent stability, low toxicity, and low detection limits in ion detection. In this work, two kinds of fluorescent nanoparticles with different fluorescent molecules, the aggregation-caused quenching (ACQ)-based PS@PAA@5-AF and the aggregation-induced emission (AIE)-based PS@P(AA- co -TPEAM), were prepared. The fluorescent properties and stability were studied and ions detection was carried out and found that each of them holds its own characteristics in these aspects. The results showed that the increase in the TPEAM dosage made the fluorescence intensity increase gradually by fluorescence spectrophotometer for PS@P(AA- co -TPEAM), while the fluorescence intensity of PS@PAA@5-AF increased first and then burst off. Subsequently, they were applied to the detection of Cu 2+ and Fe 3+ , and the detection limits obtained were 64 nM and 25 nM, respectively. Then, fluorescent nanoparticles with ACQ and AIE effect with tunable intensity and uniform distribution are prepared, which have many potential applications in ion detection, biological imaging, etc. Graphical abstract
研究领域:
分析化学
·
材料科学
·
生物医学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Jingwen Song,Kai Ma,Tifeng Jiao,Ruirui Xing,Lexin Zhang,Jingxin Zhou,Qiuming Peng
Graphene oxide (GO)-based nanocomposite films via facile and appropriate self-assembly methods have demonstrated many potential applications in wide fields. This study demonstrates a facile and clean route to prepare graphene oxide-dye composite films using Langmuir-Blodgett (LB) technique at room temperature. By electrostatic interaction between cationic dye molecules and negatively charged GO sheets as well as π-π interactions, GO-dye composite LB films were formed spontaneously. As a soft platform for dye molecules, GO sheets induce dye molecules to self-assemble and form highly ordered structures containing H-aggregates and/or J-aggregates. The morphological characterization results show the formation of GO-dye composite films with smooth and dense surfaces. And the spectral results reveal that dye molecules stack in well-organized aggregates on the surface of GO sheets corresponding to monomers in bulk solution. The present research work about GO-dye composite films by LB method may provide new clues to prepare organized composite films and demonstrate potential applications in many fields.
研究领域:
材料科学
·
纳米科技
·
表面化学
·
胶体与界面科学
·
功能薄膜
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）