OPTICS EXPRESS
·
2025
·Vol. 33
·期 6
·13895-13906
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IF 3.3
Xiaoxiao Chen,Xueguang Lu,Lu Tang,Kefan Chen,Wanxia Huang
Despite striking advances in terahertz (THz) sources and detectors, the exploitation of active materials that can alter their properties in response to external excitations for the manipulation of THz waves is another major issue. Here, freestanding and easily scalable composite film based on vanadium dioxide/carboxymethyl cellulose (VO2/CMC) is proposed to realize thermally and optically tunable THz waves. This VO2/CMC composite film exhibits broadband modulation with a modulation depth of up to 76%, a response time of about 1.2 s and high stability both in mechanical deformation and in air. Based on the above VO2/CMC composite film, a THz metamaterial with absorption-reflection switchability is demonstrated. By controlling the temperature-dependent phase transition of VO2 particles, the reflection dip of the metamaterial at 0.423 THz with an amplitude of -25 dB first shifts to lower frequencies accompanied by an increase in amplitude, and finally disappears with the THz metamaterial reflecting THz waves almost completely. The experimental results agree well with numerical simulations and the modulation mechanism of the metamaterial is also investigated. This work provides a simple and low-cost method for developing VO2-based THz multifunctional smart devices with promising applications in areas such as but not limited to THz modulators and sensors.
研究领域:
材料科学
·
光学工程
·
太赫兹技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Engineering
·
2022
·
IF 12.834
Xiao-Chang Xing,Yang Cao,Xiao-Yong Tian,Lingling Wu
Metamaterials have attracted increasing attention in recent years due to their powerful abilities in manipulating electromagnetic (EM) waves. However, most previously reported metamaterials are unable to actively control full-band EM waves. In this paper, we propose a thermo-tunable broadband metamaterial (T-TBM) using paraffin-based composites (PD-Cs) with different phase transition temperatures. Active control of the T-TBM reflection loss peaks from low to high frequency is realized by manipulating the solid–liquid state of the PD-Cs at different phase transition temperatures. The absorption peak bandwidth (where the reflection loss value is less than −30 dB) can be changed, while the broad bandwidth absorption (where the reflection loss value is less than −10 dB) is satisfied by adjusting the temperature of the T-TBM. It is shown that the stagnation of the phase transition temperature of the PD-Cs in the T-TBM provides a time window for actively controlling the EM wave absorption response under different thermal conditions. The device has a broad application prospect in the fields of EM absorption, intelligent metamaterials, multifunctional structural devices, and more.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 63
·33466-33473
·
IF 3.708
Qing Wang,Zhi Min Wu,Yongfei Li,Ying Tan,Ning Liu,Yuejin Liu
The efficient hydroxyalkylation of phenol with formaldehyde to bisphenol F over a thermoregulated phase-separable reaction system containing a water-soluble Brønsted acidic ionic liquid was studied. The reaction system containing the water-soluble IL showed thermoregulated biphasic behavior with change of the alkyl chain length of IL, temperature and water amount. Four types of imidazolium-, ammonium-, phosphonium- and pyridinium-based water-soluble ionic liquids with different anions of dihydrogen phosphate [H2PO4]−, acetate [CH3COO]− and hydrogen sulfate [HSO4]− were used as both Brønsted acidic catalysts and thermoregulated solvents. Among them, [C6MIM][HSO4] gave a high yield of 80.5% and a selectivity of 96.9% for bisphenol F, and the optimal reaction conditions were stirring speed 450 rpm, phenol–formaldehyde ratio 6 : 1, IL catalyst molar concentration 12.5%, reaction temperature 90 °C and reaction time 1 h. [C6MIM][HSO4] could be recovered by simple decantation and could retain its original activity even after six recycling-uses [CnMIM][HSO4] with the alkyl chain length n = 6 found to be the most suitable for the synthesis of bisphenol F because of both the formation of a thermoregulated monophasic reaction system at 90 °C to enhance the reaction efficiency and as a thermoregulated phase-transition solvent to facilitate its recovery from the reaction system.
研究领域:
化学工程
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Min Wang,Qi Wang,Junzheng Wang,Ronghao Liu,Guanju Zhang,Yanzhao Yang
Two ionic liquid (IL) thermomorphic systems were designed. The thermoregulated property exhibited by the IL systems was utilized for the recovery of Au(III) from acidic medium. The cloud point order of the two ILs was proposed and evidenced via a combination of experimental measurements and quantum chemical calculations. The impacts of salt ions and acid on the thermomorphic phase behavior of the IL–H2O binary mixture system were investigated. After comprehensive comparison, a systematic study of Au(III) extraction by the [Suc][Tf2N]2 (succinyl bis(trifluoromethylsulfonyl)imide) system was carried out because of its outstanding hydrophobicity and extraction ability. Then, a comparison between traditional liquid–liquid extraction (TLLE) and homogeneous liquid–liquid extraction (HLLE) was made during the process of optimization of various extraction parameters. In addition, the anion-exchange mechanism in the extraction process was revealed. The thermoregulated [Suc][Tf2N]2 system presented an excellent selectivity for Au(III) in a solution of coexisting multimetallic ions. Finally, Au(III) was almost completely stripped from the loaded IL phase by oxalic acid. The extraction efficiency of Au(III) using regenerated IL still maintains a surprising stability after five turns of cycling experiments. Hence, the dicationic IL [Suc][Tf2N]2 was regarded as a potential extractant for the recovery of gold.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Energies
·
2022
·Vol. 15
·期 12
·4197
·
IF 3.252
Guokun Yang,Tianle Liu,Hai Zhu,Zihan Zhang,Yingtao Feng,Ekaterina Leusheva,Valentin Morenov
This study aims to develop a novel low-heat cement slurry using phase change microcapsule additives to reduce the decomposition of hydrate-bearing sediments during cementing. Microcapsules were prepared by coating mixed alkanes with polymethyl methacrylate, and lipophilic-modified graphite was incorporated to enhance the thermal conductivity of microcapsules. The effects of microcapsules upon the hydration heat, pore distribution, and compressive strength of the cement slurry/stone were studied through a variety of tests. The results showed that the phase-change temperature, thermal enthalpy, and encapsulation efficiency of the microcapsules were 8.99–16.74 °C, 153.58 Jg−1, and 47.2%, respectively. The introduction of lipophilic-modified graphite reduced the initial phase-change temperature of microcapsules by 0.49 °C, indicating an improvement in their temperature sensitivity. The maximum hydration heat of cement slurry decreased by 41.3% with 7% dosage of microcapsules; the proposed microcapsules outperformed comparable low-heat additives. Moreover, the presence of microcapsules could reduce the number of large pores in (and thereby improve the compressive strength of) cement stone. The innovation of this study is that it comprehensively and intuitively confirms the feasibility of the application of low-heat cement slurry with MPCM as the key in hydrate sediments rather than just focusing on the reduction of hydration heat; furthermore, a self-made cementing device was developed to simulate the cementing process of hydrate deposition. The results show that the thermal regulation of microcapsules inhibited the temperature increase rate of the cement slurry, significantly reducing the damage caused to the hydrate. These findings should improve the safety and quality of cement in offshore oil and gas well applications.Keywords:microencapsulated phase-change materials;heat control;temperature sensitivity;cementing;hydration heat;natural gas hydrate-bearing sediment
研究领域:
土木工程
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材料科学
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海洋工程
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Zhitao Li,Dong Wang,Hong Gao,Hui Cao,Yuzhen Zhao,Zongcheng Miao,Zhou Yang,Wanli He
Cholesteric liquid crystal (CLC) exhibits selective reflection, making it a great application in the field of light control. Here, a near-infrared light (NIR) was used to drive the self-organizing spiral superstructure of the cholesteric liquid crystal to adjust the reflection notch. The polymer dye M2 with near-infrared absorption properties was synthesized by thiol-ene click polymerization and [2 + 2] click reaction; and has good solubility in the CLC system. M2 absorbs near-infrared light to increase the temperature of the system and the temperature-sensitive chiral dopant CD can realize the photothermal tuning of CLC system by the spiral twisting force of CLC with the change of temperature. The use of near-infrared light is beneficial compared to ultraviolet (UV) and visible light because of its invisibility, high penetration and ease of remote control. The entire CLC system has good near-infrared absorption, fast light response and a wide adjustable range.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 16
·3962-3972
·
IF 5.256
Shunsheng Ye,Hongyu Wang,Hongyang Su,Lingxia Chang,Shuli Wang,Xuemin Zhang,Junhu Zhang,Bai Yang
A facile strategy is reported for the electrostatic self-assembly of homogeneous and gradient plasmonic nanoparticle arrays with tunable interparticle distances and optical properties. The interparticle distance is dominated by the surface charge density of the substrate, which is tuned via thermal annealing according to the temperature-dependent molecular mobility of the polymer. Oxygen plasma is employed to endow neutral polystyrene (PS) films with sufficient charges, enabling subsequent electrostatic adsorption. The density of surface charges can be readily tuned via a thermal annealing step after plasma treatment, which is confirmed by quantitative analyses of oxygen and nitrogen using X-ray photoelectron spectroscopy. Afterwards, PS films with regulated charge densities reshape the double layers around nanoparticles to various degrees during the assembly, leading to tunable interparticle separations. UV-Vis spectroscopy reveals tunable plasmonic properties owing to the critical role of interparticle separation in plasmon coupling. Here such structures are demonstrated to act as wavelength-selective substrates for multiplexed acquisition of surface enhanced Raman scattering. Alternatively, by applying a temperature gradient in the annealing step, we create a macroscopic surface with a continuous gradient in plasmonic properties. Such a “plasmonic library” can be a promising material for fast screening of interparticle distance or extinction spectrum in specific applications on one single substrate.
研究领域:
纳米材料
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光学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 12
·10483-10489
·
IF 9.5
Chen Zongwei,Li Zhengxiao,Li Fan,Huo Jingzhu,Meng Xinyi,Ma Shihao,Zhu Wenbo,Guo Fengqi,Hu Jia-Hua,Wu Kaifeng
Precise modulation of photoluminescence (PL) of nanomaterials by external control is of great interest in such diverse areas as photocatalysis, memory and sensing. Recent studies have combined colloidal quantum dots (QDs) with photochromic molecules to construct optically switchable PL systems. However, it still remains challenging to switch the PL on and off in the near-infrared (NIR) region with multi-stimuli such as light and heat. Here, we present light and heat triggered modulation of the NIR PL of PbS QDs using adjacent spiropyran derivatives. The NIR PL of PbS was reversibly switched on and off through the isomerization process of spiropyran molecules that can be triggered by either light irradiation or heating. The PL intensity of the off state is low enough to yield an on/off ratio as high as 54. Transient absorption measurements revealed ultrafast photoinduced hole transfer from PbS to spiropyran, the rate and efficiency of which depend critically on the driving force that can be deeply modulated through spiropyran isomerization. This study not only establishes a novel multi-stimuli switchable PL system in the NIR, but also provides fundamental guidelines for the design for such systems for a variety of emerging applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Analytical Methods in Chemistry
·
2018
·
IF 1.262
Rui Lv,Shuya Cui,Yangmei Zou,Li Zheng
Two thermoregulated dicationic ionic liquids were synthesized and applied for effective extraction of the common dye malachite green oxalate (MG). The extraction parameters such as amount of ionic liquids, pH of water phase, extraction time, cooling time, and centrifugal time on the extraction efficiency were investigated systematically. It revealed that the dye has been successfully extracted into the ionic liquids, with high extraction efficiency higher than 98%, and recovery of 98.2%–100.8%, respectively. Furthermore, these ionic liquids can be recycled easily after elution. The reusable yields were 87.1% and 88.7%. The extraction of the dye into the thermoregulated ionic liquid provides a method of minimizing pollution of waste water potentially.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY AND BUILDINGS
·
2025
·
IF 7.1
Jianjuan Yuan,Xuan Zhao,Xuemei Zhang,Yue Han,Xiangfei Kong
Phase change materials (PCM) hold promise for enhancing the performance of building transparent envelope structures. Using PCM alone in window lacks the ability to regulate the indoor light environment, a drawback that photochromic materials can effectively address. Herein, this study successfully synthesized a novel light-modulating phase change material named SPCM@PC-film through the spinning drop method, by combining shaped phase change material (SPCM) with photochromic film (PC film). The transmittance of this composite material reaches 62.10 % under high-temperature conditions, which can fully meet indoor lighting requirements. Compared with SPCM, SPCM@PC-film exhibits significantly lower transmittance for infrared and ultraviolet rays, demonstrating excellent light-blocking performance. A comparative analysis of the regulatory effects of SPCM smart windows (W1) and SPCM@PC-film smart windows (W2 and W3) on indoor thermal and optical environments revealed that W2 achieved the optimal performance, with the PC film facing the outdoor side. W2 not only effectively reduced indoor temperature but also maintained indoor illumination. Furthermore, under simulated outdoor conditions in summer, W2 reduced indoor temperature by up to 1.66 ℃ while keeping indoor illumination stable within 2000 lx. Moreover, during the noon period, W2 cut indoor temperature by 2.75 ℃ at most and illumination by 1088 lx, maintaining it at 1704 lx. These results fully demonstrate that the SPCM@PC-film smart window has the ability to create a more comfortable indoor thermal and optical environment.
研究领域:
建筑材料
·
能源效率
·
智能技术
·
光学工程
·
热管理
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yuting Liao,Dong Liu,Bin Wang,Zijian Wu,Miao Ni,Mengchen Wang,Cheng-Hua Wang,Yuan Lu
The intensification of microreactions is important for biological and chemical reactions with microliter volumes as reaction units, including microliter bioassay or protein synthesis. At the micro/nanoscale, the fluid flow is usually located in the laminar region, making the interaction between different layers of material more difficult. In the absence of external intervention, the microscale transport of substances is dominated by passive diffusion, leading to a lower mixing efficiency and longer reaction times, which is disadvantageous for reactions requiring timeliness, such as microliter bioassays. Therefore, the intensification of microreactions is essential. Here, a dual magnetic–photothermal microreaction control platform was created, based on the cooperative roles of a close-loop photothermally controlled magnetically active nanoswarm (PMANS) as a nanostir for quick fluid mixing and as a nanoheating agent for the reaction solution. The platform was demonstrated to be enhanced for microreactions by using the glucose oxidase and horseradish peroxidase cascade and cell-free synthetic superfolder green fluorescent protein reactions, which are typical in the fields of diagnostic testing and biomanufacturing, respectively. The rotational motion of the PMANS is controlled by the magnetic field to achieve efficient and homogeneous mixing of fluids at the microscale. On the other hand, the PMANS is used to heat the reaction system through light control. The construction of a dual magnetic–temperature control platform provided a new strategy for microreaction enhancement that was convenient, controllable, and broadly applicable. This control platform has great potential for microscale reaction enhancement in detection, sensing, catalysis, and synthesis.
研究领域:
生物化学
·
纳米医学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kai Liu,Na Wang,Zongliang Kou,Xiaxin Jiao,Suguang Yang,Minghui Lyu,Hong Li,Zhenyu Zhao,Xin Gao
Precise utilization of microscale localized heat to enhance catalytic reactions and nanomaterial preparation requires insights into the effects of external microscale heat transfer and key process factors on its formation and quantitative regulation. Here, we innovatively developed microwave-responsive nanoencapsulated fluorescence thermometers (MNFT S ) as a research platform with regular shapes, excellent thermosensitive fluorescent properties, and adjustable MW-absorbing properties that enable the precise fluorescence thermometry and flexible creation of micro-localized hotspots, allowing the systematical investigation of microscale localized heat regulation in chemical production. In-situ observations of MNFTs revealed that localized thermal convection induced by solid–liquid temperature differences and solvent warming reduced the overheating of the microscale hotspot by 38%. In comparison, the hotspot intensity maintained only 10% of its initial value under forced convection, emphasizing the importance of external microscale heat transfer in quantitatively regulating microscale localized heat. Subsequently, an innovatively developed and rigorously validated theoretical model accurately elucidated the key influencing factors and quantitative regulation mechanisms of MW-induced microscale hotspots, facilitating the precise regulation of microscale hotspots in MW-assisted catalytic reactions, material synthesis, and chemical separation processes. This fundamental research advanced our understanding of quantitatively regulating microscale localized heat, promoting its better application in chemical production.
研究领域:
化学工程
·
材料科学
·
热力学
✓ 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）