SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2014
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IF 2.129
Linlin Wang,Yizhong Shen,Shaopu Liu,Jidong Yang,Wanjun Liang,Dan Li,Youqiu He
The interactions of topotecan hydrochloride (THC), neutral red (NR) and thioglycolic acid (TGA) capped CdTe/CdS quantum dots (QDs) built a solid base for the controlling of the fluorescent reversible regulation of the system. This study was developed by means of ultraviolet–visible (UV–vis) absorption, fluorescence (FL), resonance Rayleigh scattering (RRS) spectroscopy and transmission electron microscopy (TEM). Corresponding experimental results revealed that the fluorescence of TGA-CdTe/CdS QDs could be effectively quenched by NR, while the RRS of the QDs enhanced gradually with the each increment of NR concentration. After the addition of THC, the strong covalent conjugation between NR and THC which was in carboxylate state enabled NR to be dissociated from the surface of TGA-CdTe/CdS QDs to form more stable complex with THC, thereby enhancing the fluorescence of the TGA-CdTe/CdS QDs-NR system. What is more, through analyzing the optical properties and experimental data of the reaction between TGA-CdTe/CdS QDs and NR, the possible reaction mechanism of the whole system was discussed. This combination of multiple spectroscopic techniques could contribute to the investigation for the fluorescent reversible regulation of QDs and a method could also be established to research the interactions between camptothecin drugs and dyes.
研究领域:
药理学
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纳米生物学
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2024
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IF 7.1
Duo Wei,Nuoqing Yin,Dehua Xu,Lingling Ge,Rong Guo
Multicompartments in complex emulsions, which mimic the organelles of living cells, can spontaneously sequester reactants/products and confine spatially incompatible compounds. This provides opportunities to control spatiotemporal reaction processes and to be a sustainable and high-efficiency platform for biphasic reactions even under stirring-free and ambient temperatures. We introduce a new multicompartment droplet microreactor based on one-step prepared complex emulsions. An organic/aqueous addition reaction between oil-soluble stilbene and water-soluble N-bromosuccinimide is employed as a model biphasic reaction. The conversion in the proposed complex droplet microreactor achieves a rate about 25 times higher than that in a traditional triphasic batch system. Over a 10 times threshold of the reaction rate is finely tuned by rationally engineering diverse droplet morphologies. Reversible in situ control of the reaction kinetics is achieved based on the reversible topology transition manipulated by the surfactant composition and temperature, with no need for adding any extra substance. Furthermore, reaction kinetics are precisely regulated by the droplet size and the shape of the two inner lobes. After rapid demulsification, over 86% of the target product is spontaneously enriched in one separated phase with a maximum purity of 98% following solvent removal. The byproduct succinimide and the solvent fluorocarbon phase are fully recycled to avoid potential pollution problems.
研究领域:
化学工程
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生物化学
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材料科学
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DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
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2022
·Vol. 43
·期 6
·2100904
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IF 5.006
Guangyao Li,Mingcong Xu,Siyu Zhang,Guang Yang,Wei Li
Chirality represents a fundamental structure in nature and the induction and reversible modulation of supramolecular chirality with feasible techniques is of great value in the design of new chiroptical smart materials. Herein, two kinds of azobenzene side-chain polymers (without spacer: Azo-PMA0; with 6 spacers: Azo-PMA6) are synthesized, the length of spacer and azobenzene chromophores play a vital role in chirality transfer and modulation. The supramolecular chiral arrangement of Azo-PMA0 (amorphous phase) can be completely controlled and reversibly modulated over multiple cycles by 450 nm circularly polarized light driven by the supramolecular interaction between azo groups of polymer chains, with an absorption dissymmetry factor (g) value of 0.0019. The chiroptical properties of Azo-PMA6 (liquid crystal state) can also be reversibly modulated by UV light and thermal annealing treatment during trans-cis isomerization of azo chromophore, with the g -value changes from 0–0.038. The successful construction of reversible chiral induction and modulation based on side chain azobenzene polymers may pave the way for designing photo-switchable functional materials.
研究领域:
材料科学
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高分子化学
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光化学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2014
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IF 2.538
Yuanji Gao,Bing Xia,Jie Liu,Lisheng Ding,Bangjing Li,Yan Zhou
This study reported a smart, easy to apply, flexible and green strategy for obtaining a biomimic micro-nanostructures. 1-Mercapto-12-( p -nitrophenoxy) dodecane (MPND) and n -dodecanethiol were used to form low surface energy film on a silver mesodendritic structure coated zinc substrate. Scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS) were used to characterize surface morphology and mesocrystal structures. Noncovalently linked sodium nonanoyloxy benzene sulfonate (NOBS) was used to form “lipid-like bilayers” on the surface, making it possible for the surface to switch its surface wettability reversibly. The water contact angle (CA) on the constructed surface varies from 168 ± 2° (before processed by NOBS) to 55 ± 2° (after processed by NOBS). This phenomenon can be explained by the formation and disruption of “lipid-like bilayers” to affect the wettability of the surface. This work is of great scientific interests and may provide insights into the design of novel functional devices that are relevant to surface wettability, such as microfluidic devices and sensors.
研究领域:
材料科学
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生物仿生学
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表面化学
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DOI
高影响因子
Inorganic Chemistry Frontiers
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2019
·Vol. 6
·期 10
·2756-2766
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IF 5.934
Fengming Yang,Bing Jia,Tong Wei,Chuanzhen Zhao,Qingjun Zhou,Zepeng Li,Mingrun Du,Mingchao Wang,Yiyang Liu,Chanying Xie
Reversible upconversion (UC) luminescence modulation by external stimuli (i.e. electric field, magnetic field, and light irradiation) is extremely attractive for applications in a broad range of fields, such as photoswitches, high-density optical data storage devices, and optical sensing. In this work, one kind of novel phosphor, Er3+-doped Bi4Ti3O12 (Bi4−xErxTi3O12) ceramics, prepared by a conventional solid-state reaction approach, is reported which exhibits both bright UC luminescence and a remarkable photochromic (PC) effect. The UC luminescence, PC effect, and the coupling between UC and PC performances were investigated in detail. It is found that the UC luminescence could be readily modulated by alternating visible light irradiation and a thermal stimulus, and a large reversible luminescence regulation has been achieved based on the PC reaction. Meanwhile, the modulation of UC luminescence was shown to tightly depend on the irradiation time and thermal treatment processes. In addition, the coloration and decoloration processes also exhibited good fatigue resistance. The mechanisms related to the UC emissions, PC processes, and luminescence modulation are also discussed. These results indicated that Bi4−xErxTi3O12 samples could be potentially utilized as a kind of optical data storage material.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
Advanced Optical Materials
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2025
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IF 7.2
Jiao Liu,Zhen-Peng Song,Juan Wei,Jun-Jie Wu,Chi-Bo Feng,Xin-Yu Zhou,Jing-Xue Hu,Ruo-Chen Lan,Yun Ma,Bing-Xiang Li,Huai Yang,Yan-Qing Lu,Qiang Zhao
Dynamic and reversible manipulation of circularly polarized luminescence (CPL) in soft materials is highly desirable for advanced chiroptical devices, information encryption, and labeling technology. However, this remains a formidable challenge in circularly polarized organic ultralong room-temperature phosphorescence (CP-OURTP) materials. Herein, a bilayered chiral-switchable CP-OURTP system is presented, composed of a light-driven hydrazone photoswitch (M1)-doped soft helical superstructure layer and a room temperature phosphorescence (RTP) polymer layer, enabling dynamic chirality inversion in a reversible manner under alternating stimulation of 460 and 340 nm light irradiation. The obtained bilayered film exhibits CP-OURTP with a maximum absolute luminescence dissymmetry factor ( g lum ) value of 0.39 and a long-lived emission lifetime of 823 ms. Notably, the g lum values of the bilayered CP-OURTP film can be dynamically and reversibly modulated between +0.30 and−0.35 under the irradiation of light with different wavelengths over 50 cycles without fatigue, owing to the photoinduced configuration changes of M1, making the first example of dynamically and reversibly regulating the chirality inversion in CP-OURTP materials.
研究领域:
材料科学
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光学
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有机化学
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DOI
高影响因子
ADVANCED MATERIALS
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2025
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IF 26.8
Meng Wei,Junyi Han,Chen Yu,Pan Li,Xiaoye Zhang,Jiheng Ding,Mengwei Chen,Xuke Li,Guangqiang Yin,Tao Zhang,Jinggang Wang,Partick Théato,Tao Chen,Wei Lu
Current luminescent polymer hydrogels rely primarily on tunable emission intensities/colors. Room-temperature phosphorescence (RTP) hydrogels with on-demand programmable lifetimes, albeit long envisaged, have never been achieved, but such RTP hydrogels will provide another lifetime dimension to enrich the family of stimuli-responsive materials for broadening their emerging applications. Herein, the mass diffusion-dominated phase separation strategy is proposed to develop the first RTP polymer hydrogels, whose lifetime can be continuously programmed from 9.1 to 130.8 ms. Upon heating at 90 °C, cooperative coordination and hydrophobic interactions in hydrogels induce a dense/sparse polymer phase separation, leading to controllable rubbery-to-glassy transition with 154-fold enhancement in Young's modulus, thereby efficiently restricting molecular vibrations and stabilizing triplet excitons. Note that the hydrogels’ RTP performance is essentially not controlled by heat transport but is dominated by phase-separation kinetics, therefore their lifetimes can be widely programmed by merely manipulating the heating duration. Further natural cooling at 25 °C makes polymer phase re-fusion to recover the rubbery state, enabling the repeatable RTP lifetime programming. Based on these findings, rewritable spatiotemporal-resolved information decryption platform with time-dependent security is demonstrated. This study opens new avenues of RTP hydrogels by demonstrating the unprecedented lifetime-programming capacity and enriches the intelligence of luminescent materials.
研究领域:
材料科学
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发光材料
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聚合物物理
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智能水凝胶
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光学功能材料
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2025
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IF 8.2
Saima Rafique,Tian-Run Zhang,Zhong-Yan Xu,Shuang Chen,Zhong-Qiu Li,Xing-Hua Xia
Solid-state memristors and nanochannel-based ionic memristors both have received increasing attention in the field of brain-like computing. However, solid-state memristors (e.g., metallic-insulator–metallic structure) rely on electron dynamics, which results in limited tuning diversity and poor biocompatibility. Ionic memristors function with ion dynamics under solution conditions, while they confront challenges such as complex structures and limited memory capacities. Here, we report an ion transport coupled electron transfer-based “electrochemical memristor” in an aqueous electrolyte, which simply consists of two electrodes. This memristor is based on the reversible formation and depletion of the insulating layer on the electrode surface, resulting in an ON/OFF ratio exceeding 1000 and a memory retention time larger than 7 days. The excellent properties allow this electrochemical memristor to realize various neuromorphic functions, including the remembering and forgetting of information, the chemical modulation of synaptic activities, and the localized and global manipulation of neural network dynamics. This research highlights the potential of electrochemical memristors for constructing high-performance neuromorphic computing architectures.
研究领域:
生物医学工程
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神经工程
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电化学
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分子器件
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类脑计算
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DOI
PubMed
高影响因子
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