JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Tao Yang,Yukun Sun,Xianyang Meng,Jiangtao Wu,J. Ilja Siepmann
This work reports new experimental data for the density and viscosity of n -decane + CO 2 binary mixtures. A simultaneous density and viscosity measurement apparatus was redesigned using a vibrating–wire viscometer coupled with a vibrating–tube densimeter. The measurements for the pure component ( n -decane) and three different binary mixtures ( n -decane + CO 2 ), with mole fractions of n -decane of (0.4026, 0.2225, 0.1262), were carried out at temperatures ranging from (303.15 to 373.15) K and pressures up to 80 MPa. The expanded relative uncertainties ( k = 2, level of confidence = 0.95) were estimated to be 0.2% for density and 3.0% for viscosity over the entire measurement range, respectively. Densities were correlated as a function of temperature and pressure through a modified Tait–type equation with an average absolute percentage deviation less than 0.05%. To model the viscosity of the binary mixtures as a function of temperature, density, and composition, the extended hard–sphere method combined with simple quadratic mixing rules were used to describe our experimental data. Good agreement is found between experiments and correlations, which attests to the predictive capabilities of semi–empirical equations. In addition, Monte Carlo simulations in the isobaric-isothermal ensemble with the Transferable Potential for Phase Equilibria–United Atom (TraPPE–UA) force field were carried out to characterize the microscopic structure of the studied systems.
研究领域:
化学工程
·
流体力学
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Qian Peng,J. Timothy Sage,Yulong Liu,Zijian Wang,Michael Y. Hu,Jiyong Zhao,E. Ercan Alp,W. Robert Scheidt,Jianfeng Li
Compared to well studied diatomic ligands (NO, CN–, CO), the axial bonds of carbene hemes is much less known although its significance in biological chemistry. The unusually large quadrupole splitting (ΔEQ = +2.2 mm·s–1) and asymmetric parameter (η = 0.9) of the five-coordinate heme carbene [Fe(TTP)(CCl2)], which is the largest among all known low spin ferrohemes, has driven investigations by means of Mössbauer effect Nuclear Resonance Vibrational Spectroscopy (NRVS). Three distinct measurements on one single crystal (two in-plane and one out-of-plane) have demonstrated comprehensive vibrational structures including stretch (429) and bending modes (472 cm–1) of the axial Fe–CCl2, and revealed iron vibrational anisotropy in three orthogonal directions for the first time. Frontier orbital analysis especially comparisons with diatomic analogues (NO, CN–, CO) suggest that CCl2, similar to NO, has led to strong but anisotropic π bonding in a ligand-based “4C”-coordinate which induced the vibrational anisotropies and very large Mössbauer parameters. This is contrasted to CN– and CO complexes which possess a porphyrin-based “4N”-coordinate electronic and vibrational structures due to inherent on-axis linear ligation.
研究领域:
生物化学
·
配位化学
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产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 34
·期 8
·2109088
·
IF 30.849
Kaizhen Liu,Guangyan Huang,Xiang Li,Guangpeng Zhu,Wei Du,Tao Wang
Vibrational strong coupling (VSC), the strong coupling between optical resonances and the dipolar absorption of molecular vibrations at mid-infrared frequencies, holds the great potential for the development of ultrasensitive infrared spectroscopy, the modification of chemical properties of molecules, and the control of chemical reactions. In the realm of ultracompact VSC, there is a need to scale down the size of mid-infrared optical resonators and to elevate their optical field strength. Herein, by using single quartz micropillars as mid-infrared optical resonators, the strong coupling is demonstrated between surface phonon polariton (SPhP) resonances and molecular vibrations from far-field observation. The single quartz micropillars support sharp SPhP resonances with an ultrasmall mode volume, which strongly couples with the molecular vibrations of 4-nitrobenzyl alcohol (C 7 H 7 NO 3 ) molecules featuring pronounced mode splitting and anticrossing dispersion. The coupling strength depends on the molecular concentration and reaches the strong coupling regime with only 7300 molecules. The findings pave the way for promoting the VSC sensitivity, miniaturing the VSC devices, and will boost the development of ultracompact mid-infrared spectroscopy and chemical reaction control devices.
研究领域:
物理化学
·
光学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Li Lijia,Chen Jiajun,Hu Laigui,Qiu Zhijun,Zou Zhuo,Liu Ran,Zheng Lirong,Cong Chunxiao
Collective vibration is pivotal for materials’ thermal, electrical, phase transition and topological properties. Lately, the rising of moiré superlattices, characterized by overarching periodicity of moiré pattern, generates highly tunable interfacial structures that manipulate collective excitations in material at the atomic scale. Here, we experimentally demonstrate moiré collective vibrations, the mechanical counterparts of moiré excitons, at heterointerfaces of twisted tungsten diselenide/tungsten disulfide heterobilayers. Using helicity-resolved inelastic Raman scattering, we find chiral interfacial phonons carrying angular momentum analogous to that of chiral bulk phonons in quartz, enabling unprecedented spectral resolution of rich vibrational modes at heterointerface in a few atomic layers. Upon mutual torsion of heterobilayers, we observe terahertz interlayer vibrations proportional to moiré periodicity as a periodic function of rotation angles, demonstrating moiré-tuned interlayer modes which couple to Coulomb-bound electron-hole pairs in interlayer moiré excitons. In low-angle strong coupling regime, interlayer dynamics exhibit a distinct long-lived breathing mode with zero angular momentum and pronounced high energy, highlighting phonon-hybridization character wherein intralayer breathing vibrations are folded into moiré mini-Brillouin zone by spatial periodicity and hybridize with interlayer vibrations. Our findings establish moiré collective vibrations as candidates for exploitation in energy-efficient thermal management, strongly correlated electrical engineering, and new emergent topological phononics.
研究领域:
凝聚态物理
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纳米材料科学
·
低维量子系统
·
声子工程
·
拓扑物态
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Actuators
·
2023
·Vol. 13
·期 1
·9
·
IF 2.6
Yuanjin Song,Zhong Zhuang,Xianping Wang,Qianfeng Fang,Zhijun Cheng,Tao Zhang
Due to friction vibration dampers’ inability to effectively dampen low loads during high-frequency dewatering, drum washing machines vibrated intensively. In order to address this problem, in this paper, a novel type of low-cost non-Newtonian fluid damper is proposed and investigated based on the non-Newtonian fluid shear thinning properties’ effect on vibration suppression during the high-frequency dewatering process of the washing machine. In contrast to other commonly used dampers, the homemade non-Newtonian fluid damper significantly suppresses the growth trend of the apparent elastic coefficient at high frequencies. A systematic investigation of damper structural parameters reveals that smaller gap height, higher piston head number, and more viscous fluid viscosity are adequate for vibration suppression and noise reduction. These results demonstrate that the non-Newtonian fluid damper can produce an excellent vibration-damping effect for the entire washing process of the washing machine, especially for the high-frequency dewatering process. The acceleration attenuation ratio can reach up to 83.49%, the energy attenuation is up to 98.44%, and the noise reduction is up to 10.38 dB.Keywords:vibration damping;non-Newtonian fluid;noise reduction
研究领域:
机械工程
·
流体力学
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产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 37
·22710-22715
·
IF 3.945
Dongyuan Yang,Yanjun Min,Baihui Feng,Xueming Yang,Guorong Wu
The S1(1ππ*) state decay dynamics of 2-pyridone excited around the 000 band origin is investigated using femtosecond time-resolved photoelectron imaging technique. At a pump wavelength of 334.0 nm, the vibrational ground state and a few low energy vibrational states covered by the bandwidth of the pump laser pulses are excited. The lifetimes of the vibrational states show strong dependence on the vibrational energy and mode. A quantum beat between two lowest energy vibrational states is also observed. This study provides quantitative information about the vibrational-state dependent lifetime of the S1 state of 2-pyridone.
研究领域:
化学动力学
·
光谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Manufacturing Processes
·
2024
·
IF 6.1
Zihao Li,Weiwei He,Yanzhen Zhang,Jide Wang,Guofang Hu,Yuyao Wu,Dege Li
The electrohydrodynamic (EHD) inkjet printing is rooted in the creep effect exhibited by fluid interfaces subjected to high-intensity electric fields. It utilizes the micro-jetting from the tip of the Taylor cone to print intricate patterns with sub-micron feature sizes. However, due to the limitations inherent in the jetting mechanism, the highest printing frequencies for conventional EHD are limited to several hundred Hertz. Here, we discover a novel phenomenon where the vibration of meniscus in an electric field can induce EHD jetting within microseconds, or even sub-microseconds. Based on this phenomenon, we propose a new method for achieving megahertz level EHD jetting based on meniscus vibrations (MVEHD). This paper systematically elucidates the fundamental mechanisms of the forced meniscus vibration, cone sharpening, and the jetting formation through a combination of experimental research and numerical simulation. Additionally, adjustable continues inkjet (CIJ) and drop on demand (DOD) inkjet printing modes were developed, demonstrating the potential of dual-mode technology in the development of automotive transparent glass heaters (TGHs) and Micro-LED displays. This method effectively elevates the efficiency of traditional EHD by 2 to 4 orders of magnitude, thereby laying a theoretical and technical foundation for the industrial application of high-throughput EHD technology.
研究领域:
材料科学
·
微纳米技术
·
印刷工程
✓ 已验证
产品关联
DOI
高影响因子
FLOW MEASUREMENT AND INSTRUMENTATION
·
2022
·
IF 2.42
Jiahui Zhang,Jingquan Luo,Yiwei Wang,Bo Dong,Zhen Xu,Lin Wang,Aixian Liu,Xuqiang Guo
Hydrodynamic cavitation (HC) commonly occurs within industrial pipelines and its unsteady flow characteristics are of great significance for energy conservation and efficiency improvement. This study investigates the effects of methanol concentration (0–20 wt%) on the cavitating flow characteristics and the degradation of Rhodamine B (RhB) under operating conditions of a 0.7 MPa pressure drop, temperature of 30 °C, 200 passes through a venturi reactor, and an initial RhB concentration of 40 μmol/L. The transient cavitation behavior was monitored using a high-speed camera. The cavitation images show that the presence of methanol generates more stable bubbles, which results in less violent bubble collapse. The pressure pulsation and vibration induced by cavitation flow were synchronously measured using high-frequency pressure and acceleration sensors. The spectral analyses of the pressure pulsation indicate that methanol has no effect on the dominant frequency (∼5.5 Hz) at different positions, and the amplitude initially increases with increasing methanol concentration and then stabilizes. The pressure pulsation intensity increases due to the increased vapor pressure of the solution. The vibration spectral analyses show that methanol has little effect on the peak frequencies, which occur near 4.0 kHz and 14.3 kHz of the low and high-frequency bands, respectively, whereas the peak amplitude decreases with increasing methanol concentration. The per-pass degradation model of RhB in methanol solution considering pyrolysis of methanol was verified for the first time and show to adequately describe the experimental data. The degradation percentage and per-pass degradation factor decrease with increasing methanol concentration. The reduced surface tension of the solution prolongs the bubble lifespan and prevents bubble coalescence , thus weakening the vibration and degradation performance . The results provide important insight for cavitation applications and degradation modeling of mixed solutions.
研究领域:
流体力学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Jing-Xiao Zhang,Tian Tian,Wen-Jie Du,Yan-Fang Guan,Yun-Jie Wang,Yu-Sheng Li,Han-Qing Yu
Forward osmosis (FO) is limited by solute buildup and membrane fouling . Although current solutions (e.g., influent pretreatment and membrane modification) have partially compensated these drawbacks, they are still enslaved to the uncertainties and costs from the complex operational requirements and large use of chemicals. Therefore, developing simply-operated and chemical-free methods is highly required. In this work, a lab-scale vibrating FO device was constructed and its water permeability and anti-fouling capacity were evaluated. The results of flux tests show that the vibration could effectively enhance the water flux and mitigate solute buildup, mainly resulted from changing the flow field on the membrane surface through the computational fluid dynamic simulations . In addition, the vibrating FO was also proven to be effective in controlling the fouling caused by model organic foulants like bovine serum albumin, humic acid , alginate , and biofouling by different ways. The results of anti-fouling tests and fouling characteristics show that the organic fouling was alleviated by disintegrating the fouling layer and reducing the solute buildup, while the biofouling was mitigated through retarding the early microbial attachment and growth. This work provides a feasibility of applying vibration as an effective strategy to control solute buildup and fouling in FO systems.
研究领域:
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ERGONOMICS
·
2025
·
IF 2.4
Xiaoya Li,Yu Huang,Ke Ni,Yuyun Gao,Yanan Du
To address rising comfort expectations in turbofan aircraft cabins, this study developed a predictive model for multimodal discomfort from combined noise and vibration. The noise/vibration stimuli were generated based on recordings in front and middle cabins during taxiing and cruising and amplitude-modulated to four intensity levels. Using a 6-DOF vibration simulator replicating cabin dynamics, we exposed 26 participants to isolated and combined stimuli. Results revealed vibration attenuated noise discomfort in middle cabin during taxiing, while noise bidirectionally modulated vibration discomfort in middle cabin during taxiing or cruising and front cabin during cruising. Mutual inhibition neutralised cross-modal effects during peak taxiing conditions in middle section. Equivalence discomfort contours quantified the relative impact of each modality, identifying optimisation priorities. A multivariate regression model predicting combined discomfort from modality-specific inputs achieved high accuracy (adjusted R2 = 0.819), providing an engineering tool for cabin environment design.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
An Zhang,Zhiyong Liu,Bing Xie,Jinshan Lu,Kun Guo,Shanming Ke,Longlong Shu,Huiqing Fan
Excellent vibration-electricity conversion in various piezoelectric materials is frequently restricted, thus hardly generates high mechanochemical potential eliciting by ferroelectric polarization for advanced catalysis processes. Herein, we propose a phase boundary in Li modified Na 0.5 K 0.5 NbO 3 (NKN) materials to improve the piezocatalytic activity, and the relationships among the composition, phase structure, electrochemical and catalytic performances were systematically investigated. An outstanding piezocatalytic performance was exhibited in the LNKN6 (6 mol % Li doped NKN) with coexistence of orthorhombic and tetragonal phases, and the piezocatalytic activity showed a superior repeatability and universal applicability for the degradation of organic pollutants. The reaction rate constant of the LNKN6 was up to 25.16 × 10 −3 min −1 , which was 3.20 times than that of pristine NKN. The enhancement of piezocatalytic activity was confirmed by Landau-Ginsburg-Devonshire phenomenological theory and the transfer efficiency of force-generated electrons and holes, and then an appropriate mechanism of the ultrasonic vibration driven piezocatalysis was speculated. This work provides an alternative strategy to enhance the catalytic efficiency of piezocatalyst and the high activity of the NKN-based piezoelectrics has an important application for environmental remediation.
研究领域:
材料科学
·
环境科学
·
催化
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Yongming Hong,Jiali He,Cuiyun Zhang,Xinping Wang
The structure of water at the graphene oxide (GO)/water interface has received considerable attention due to the high performance of GO in a wide number of applications. In this work, a face-up geometry of sum frequency generation (SFG) vibrational spectroscopy was employed to deduce the structure of water at the GO/water interface in which GO nanosheets were covered onto the water surface via Langmuir compression. The SFG results showed that the intense OH stretching bands at the range of 3000–3600 cm–1 were predominant in the spectrum with high GO coverage, which is mainly due to the third-order susceptibility χ(3) response from the water orientation in the electrical double layer induced by the static electric field of the negatively charged GO surface. In addition, the second-order susceptibility χ(2) response was relatively weak, suggesting that a few water molecules formed a H-bonding network within the closest GO surface. This work is beneficial to the in-depth understanding of water in contact with GO-based materials.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）