SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2014
·
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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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 12
·3192
·
IF 5.076
Hao Xu,Liangjing Zhang,Aiwu Wang,Juan Hou,Xuhong Guo
Photochromic materials have attracted increasing attention. Here, we report a novel photo-reversible color switching system based on oxygen-vacancy-engineered MoOxnanostructures with water/N-methyl-2-pyrrolidone (NMP) as solvents. In this work, the system rapidly changed from colorless to blue under UV irradiation (360–400 nm) and slowly recovered its colorless state under visible light irradiation. The obtained oxygen vacancy-engineered MoOxnanostructures exhibited good repeatability, chemical stability, and cycling stability. Upon UV light irradiation, H+was intercalated into layered MoOxnanostructures and the Mo6+concentration in the HxMoOxdecreased, while the Mo5+concentration increased and increased oxygen vacancies changed the color to blue. Then, it recovered its original color slowly without UV light irradiation. What is more, the system was highly sensitive to UV light even on cloudy days. Compared with other reported photochromic materials, the system in this study has the advantage of facile preparation and provides new insights for the development of photochromic materials without dyes.
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 72
·44323-44331
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IF 3.119
Hanyu Xue,Xinzhong Li,Jianrong Xia,Qi Lin
Improving the adhesion between layers and achieving the recycling of resins are challenges in additive manufacturing (AM) technology. In this work, a new type of photo-reversible crosslinking resin based on polyvinyl alcohol (PVA) and coumarin (HMC) was prepared via grafting reaction. The critical idea was to create a coumarin based photo-reversible crosslinking resin by carefully tailoring the photo-crosslinking time and temperature, so that the resin could be extruded through the nozzle and then maintain the proper shape during UV-curing. Photo-reversible crosslinking of AM resin was realized without the use of monomers, photo-initiators or propagating. A reasonable irradiation time with 354 nm (crosslink) or 254 nm UV light (cleavage) of 10 min was critical for photo-reversible crosslinking of PVA-g-HMC at 120 °C. An important result of this work was that the developed photo-reversible crosslinked resin could be reused and the printed resin exhibits excellent adhesion properties, thermal conductivity and oxygen barrier performance.
研究领域:
材料科学
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化学工程
·
制造技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaochun Liu,Jianyu Wu,Zilun Tang,Jianxin Wu,Zhiyi Huang,Xingshan Yin,Jiahao Du,Xiaofeng Lin,Wenjing Lin,Guobin Yi
Developing a shape memory polyurethane with high mechanical properties, excellent self-healing has become a huge challenge for the development of smart materials. Herein, we report the design and fabrication of a shape memory polyurethane network terminated with coumarin units (HEOMC-PU) to address this conundrum. The synthesized HEOMC-PU exhibits exceptional mechanical performance with a breaking elongation of 746% and toughness of 55.5 MJ·m–3. By utilizing the dynamically reversible behavior of coumarin units to repair the damaged network, the efficient self-healing performance (99.2%) of HEOMC-PU is obtained. In addition, the prepared network and light-induced dynamic reversibility endow the HEOMC-PU with both liquid-state remoldability and solid-state plasticity, respectively, enabling polyurethane to be recycled and processed multiple times. Furthermore, based on the fluorescence responsive characteristic of coumarin, HEOMC-PU with a fluorescent pattern can be deformed into specific three-dimensional configurations by combining photolithography, self-healing, and the shape memory effect. Such a multilevel and multidimensional anti-counterfeiting platform with rewritable fluorescent patterns and reconfigurable shapes can open up a new encryption approach for future intelligent anti-counterfeiting.
研究领域:
材料科学
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智能材料
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Xueting Zhao,Junhao Ma,Jindan Zha,Kuisui Huang,Chenghui Chai,Zhaoyi Yin,Zhiguo Song,Jianbei Qiu,Yongjin Li
Traditional inorganic photoreversible color-switching materials (PCSMs) usually exhibit slow color switching and single color switching characteristics, which severely restrict their use in information storage, anti-counterfeiting, and other applications. Herein, we report a fast photoresponsive color-switching inorganic PCSM based on oxygen-vacancy (OV) Bi3O4Br:Yb3+,Er3+ (BYE-OV) nanosheets. The BYE-OV nanosheets demonstrated considerable photoreduction activity and effective charge carrier separation when exposed to ultraviolet (UV) light, resulting in a rapid change in color from light yellow to dark brown. Moreover, under 980-nm excitation, the green and red emissions of the BYE-OV nanosheets were considerably enhanced, being 9.6 and 8.8 times higher than those of the BYE nanosheets, respectively. Additionally, BYE-OV nanosheets were combined with an agarose hydrogel to produce BYE-OV/agarose nanocomposite films, which exhibited excellent photoreversible color switching and upconversion (UC) luminescence. This research provides new insights into the development of innovative inorganic PCSMs, thereby considerably broadening their potential applications.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yuliang Wang,Ahmed Olalekan Omoniyi,Mingyu Zhang,Mingda Yang,Tuotuo Li,Dan Li,Chenyang Zou,Yang Zhou,Jianfu Zhang
This study introduces waterborne polyurethane (WPU) films with defined shape memory and multistimuli responsive properties for information encryption. The shape memory feature is attributed to the semicrystalline structure of polycaprolactone (PCL) serving as the soft segment in the WPU. Incorporating the photoreversible moiety 9-anthracenemethanol (9-An) impacts photoresponsive characteristics and enhances the tensile strength of the film after 1 h of ultraviolet irradiation. The demulsification-induced fast solidification (DIFS) method offers rapid film preparation, controllable thicknesses, and multidimensional shapes, surpassing the conventional cast method. Cellulose nanocrystals (CNCs) render the WPU composite films solvent-sensitive, inducing color changes through cholesteric structure pitch alterations. The resulting combination of photo- and solvent-sensitivity with shape memory attribute positions the films as promising candidates for multilevel information encryption, offering an approach to functional polymer film development.
研究领域:
材料科学
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高分子化学
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光学材料
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
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2020
·Vol. 8
·期 44
·15697-15704
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IF 7.059
Mengyu Deng,Yangdaiyi Zhang,Yufei Wang,Shimei Jiang
A new kind of photoswitchable polymer nanoparticle is prepared using polymerizable alkenyl carbon dots (PCDs) and a spiropyran derivative, together with methyl methacrylate (MMA) as the monomer, and mediated by one-pot miniemulsion polymerization. Switching between two different wavelengths of emitted light can be realized by intraparticle fluorescence resonance energy transfer (FRET). The FRET efficiency could be easily controlled by the feed ratios of the two chromophores and the excitation wavelengths. UV and visible light can be applied to modulate the fluorescence emission of the prepared nanoparticles. Upon visible light irradiation, the nanoparticles emit blue-green fluorescence of the CDs while spiropyran is in its closed form (SP). UV irradiation of SP gives rise to an open-ring isomer (MC). An SP-to-MC photoisomerization triggers a CD-to-MC FRET, and the resulting nanoparticles emit red light. Their fluorescence could be reversibly switched between blue-green and red by using UV/vis light irradiation with excellent photoreversibility and high stability. In addition, the novel nanoparticles with reversibly photoswitchable fluorescence could be directly applied in rewritable fluorescence patterning and dual-color fluorescence imaging of living cells.
研究领域:
材料科学
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生物医学工程
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光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 8
·3863-3873
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IF 10.733
Kewei Yang,Xiaoyu Chen,Zhenhuan Zheng,Jiaqi Wan,Miao Feng,Yan Yu
TiO2 nanocrystal (NC)-based photoreversible color switching (PCS) materials, which are capable of actively responding to external light, have significant potential for use in printable rewritable paper in the creation of sustainable technologies. Reductive TiO2 NCs with high hole-scavenging capabilities can be obtained by surface disorder or lattice distortion, but achieving an optimum balance between them is still a great challenge to enable simultaneous retention of the photoreduction performance and visible light catalytic ability of the TiO2 NCs. Here, we demonstrated solvent-controlled synthesis of interstitial Sn2+-doped TiO2 NCs and investigated the effects of solvent-induced surface disorder and doping-induced lattice distortion on the PCS properties of the TiO2 NCs. The midgap state produced by surface disorder combines with the energy level produced by the interstitial Sn2+ dopants in TiO2 NCs to become the main center for photogenerated electron transfer. Thus, efficient PCS was achieved, with the number of switching cycles greatly increased. The ethylene glycol-synthesized TiO2 NCs with a Sn2+-doping concentration of ca. 3% are the most favorable catalyst for achieving PCS performance. The process of PCS can be repeated 48 times without any rest. The results of this work suggest an approach to the design and preparation of PCS materials that exhibit excellent scalability and outstanding reversible performance by using colloidal NCs with optimized surface composition, lattice structure, and particle size as key-functional photocatalysts.
研究领域:
材料科学
·
光催化
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产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Le Liu,Rongjin Zeng,Jiawei Jiang,Tiancheng Wu,Peisheng Zhang,Chonghua Zhang,Jiaxi Cui,Jian Chen
The photoswitchable system with color and multi-state fluorescence changes is the key to the realization of advanced multi-level information storage, and its application potential has far exceeded the monochromatic fluorescent system. Herein, we introduced a novel multi-state photoswitchable fluorescent polymeric nanoparticles , which contains two energy-matched photoswitchable fluorescent molecules, i.e. diarylethene derivative (BH, donor) and spiropyran derivative (SPMA, acceptor), to construct a tunable fluorescence resonance energy transfer (FRET) system. By optimizing the feeding ratio of the two photochromic molecules to control the efficiency of energy transfer, the fluorescence of the nanoparticles can be reversibly switched among none, red, orange, and green by adjusting the wavelength of light stimuli. In addition, the nanoparticles display good water dispersibility , high brightness, fast responsiveness, excellent photoreversibility, and long-term fluorescence stability. We also verified that the system has great potential in optical data storage, multi-layer information encryption , and anti-counterfeiting.
研究领域:
材料科学
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光学
·
化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
You Zhang,Wenzhong Ma,Jing Zhong,Zhou Zhou,Haicun Yang,Zheng Cao,Shuo Wang
Shape memory polymers (SMPs) designed with desired performance depend on a deeper understanding of network topology and macro characteristics. Although photoreversible dynamic covalent bonds are used for permanent shape reconstruction of SMPs due to their economical and rapid, the disordered network structure limits the ability to improve shape memory performance through structural adjust. In this work, the polycaprolactone networks with sliding structural components (polyrotaxane) and photoreversible components (coumarin) were prepared by preprogrammed precursors. The SMPs network topology is controlled by adjusting the length of molecular chain and sliding distance. Reversible bonding can realize complex shape designability and solid remodeling. Furthermore, the supramolecular structure of polyrotaxane can adjust the uneven stress distribution caused by network topology defects, so the material can instantly return to its original shape under more than 300 % strain, and its elongation at break is over 1600 %. Especially the thermo-mechanical properties of materials can be adjusted by simple preliminary monomer synthesis steps. The results revealed the material has excellent shape memory and controllable thermodynamic properties, which provides a new paradigm for the preparation of high performance SMPs.
研究领域:
材料科学
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高分子化学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 44
·2303765
·
IF 19
Xiang Li,Hong Wang,Jian Chen,Yong Tian,Chongchen Xiang,Wanqiang Liu,Zhihua Zhou,Jiaxi Cui,Xudong Chen
Photoswitchable fluorescent polymers (PFPs) are emerging as a class of promising systems for photowritable pattern, optical anti-counterfeiting, and information encryption. They typically use harmful UV light as the stimulus, which often leads to inevitable photobleaching and poor reversibility. To address this issue, visible-light-driven PFPs by copolymerization of novel negative photochromic spiropyran monomer and methyl acrylate are developed. The obtained copolymers display bright red fluorescence, which can be reversibly turned off by visible light irradiation. Many appealing features are observed in this system, including fast photo-responsibility, prominent photo-reversibility and photostability, simple preparation process, and processability. Their applications in photorewritable patterns, optical anti-counterfeiting, and information encryption are also demonstrated.
研究领域:
材料科学
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光电
·
化学
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2025
·
IF 5.2
Xiyu Wang,Qing Zheng,Xinhua Lu,Yuanli Cai
Biomimetic synthesis represents a cutting-edge topic in chemistry/materials science. Herein, we demonstrate poly(ethylene glycol) (PEG) short side-chain-assisted monomer complex coacervation and reaction-induced polyion complex compartmentalization that lead to oxygen-tolerant polymerization-induced electrostatic self-assembly (PIESA). This is achieved by the one-pot synthesis of a PEGylated anionic polyelectrolyte and heterogeneous iterative polymerization of a cationic monomer under ecofriendly ambient, in-air aqueous photo-RAFT conditions. Simultaneous reversible all-segment-participating ternary complex coacervation and Coulombic interdomain interactions lead to coacervate nanoreactors that are capable of immediate initiation and fast reversible addition–fragmentation chain transfer reactions. Approximately 2 nm monomer complex nanoclusters act as building blocks to drive liquid–liquid phase separation. Polymerization induces hierarchical self-assembly in a droplet nucleation–fusion–fission mechanism together with PEG-crowded polyion complex compartmentalization, using nanoclusters as building blocks, mechanistically similar to liquid–liquid phase separation through supramolecular polymerization. Consequently, protein-like, one-component multicompartment coacervate nanoreactors with oxygen-tolerant well-controlled fast reactions are achieved. This work provides important implications for the efficient precise synthesis of biomimetic coacervate nanodevices of increasing complexity.
研究领域:
化学
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材料科学
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聚合物化学
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纳米技术
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）