Additive Manufacturing
·
2019
·
IF 7.173
Li Wang,Yu Luo,Zhiqiang Yang,Wanjing Dai,Xiaoyang Liu,Jingyuan Yang,Bingheng Lu,Lijia Chen
Nowadays, along with the demand for new technologies and new materials, a revolution in 3D printing technology is emerging. In recent years, stereolithography 3D printing has been widely used in both academia and industry, due to its fast forming speed, high precision, and low-cost advantages. The continuous liquid interface production technology has made the printing speed even faster. However, the process of resin refilling constrains the printing speed and the printing capabilities of such technologies, since only hollow structures can be fabricated. In this study, a nano-textured hydrophobic PDMS contacting layer and an oxygen-permeable membrane were bonded together as the functional release film. The oxygen inhibition layer was successfully maintained by the molecular oxygen permeated through the composite release film, achieving rapid stereolithography, and key factors that affecting resin refilling are selectively studied by the orthogonal experiment. Crucially, according to the simulation and experimental results, the adoption of the hydrophobic nano-texture not only increased the refilling speed of the resin by two times and reduced the printing time by nearly 25%, but also improved the printing reliability by reducing the vacuum (negative pressure) caused by the original slow refilling speed. Additionally, optical simulations also demonstrated that the nano-texture would not influence the curing effect of the resin. This work proposed a promising strategy for rapid stereolithography of 3D models containing larger cross-sectional areas.
研究领域:
材料科学
·
3D 打印技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Mengru Geng,Jiaqi Zhao,Jie Li,Boyue Liu,Ruiming Liu,Xiaojuan Wang,Wanlong Song,Mingzhe Shao,Yihao Luan,Qun Li,Meng Gao,Fengshan Zhang,Xiaosen Pan,Ning Ma,Guigan Fang
Hydrophilic cellulosic materials exhibit extraordinary effectiveness on sensitivity of humidity. However, the fibril network in fiber walls hinders both permeability and desorption of water, resulting in to weak their responsiveness and recoverability to humidity. Here, structural optimization is achieved by modulating interfacial bonding, resulting in an unprecedented increment in the response-recovery speed of cellulosic humidity sensors. Precisely, hydrolyzable thiol silane is introduced between cellulose nanofibers and carbon nanotubes for a covalent interface, which promotes a dense structure under evaporation induction (76.33 % reduction in thickness), avoiding the deep penetration of water. In addition, Cs 2 SnCl 6 perovskites are loaded by means of strong coordination to boost the chemical dissociation of water molecules, further enhancing the responsiveness and sensitivity of devices. The as-prepared sensor exhibits excellent response/recovery speed (1.8 s / 2.9 s) between 11 % RH to 95 % RH, which is ahead of cellulosic humidity sensors developed in the past three years, as well as satisfactory sensitivity (5.35 × 10 6 %), hysteresis (< 1 % RH), and stability (over 90 days). For application purposes, skin moisture, breathing patterns, and word syllables can be accurately identified. Moreover, it can monitor respiratory rate and amplitude stably during long-term exercise, indicating remarkable potential in human physiological humidity monitoring.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Russian Journal of Physical Chemistry B
·
2024
·Vol. 18
·期 1
·189-202
·
IF 1.4
Du M.-R.,Chen Y.-H.,Cao W.,Wang R.-S.,Hu S.-S.,Wang T.-Z.,Chen Z.-F.
Abstract In order to achieve emulsion explosives with high power and good thermal stability, an emulsion explosive containing TiH 2 with varying particle sizes was developed, and its properties were determined through experimental analysis. The results of detonation velocity experiments revealed that the incorporation of TiH 2 reduces the detonation velocity, with the degree of reduction being dependent on the particle size of TiH 2 . Specifically, when the particle size of TiH 2 is 44, 30, and 10 μm, the detonation velocity decreases by 5.8, 3.9, and 3.0%, respectively. Furthermore, experiments on explosion heat and brisance showed that TiH 2 improves the heat of detonation and brisance of the explosives. Specifically, when the particle sizes of TiH 2 are 44, 30, and 10 μm, the heat of detonation increases by 4.1, 4.5, and 5.0%, respectively, and the brisance increases by 15.3, 16.6, and 19.1%, respectively. Additionally, TG-DTG experiments revealed that while TiH 2 does not affect the thermal decomposition characteristics of the emulsified matrix, it does impact its apparent activation energy. Specifically, when the particle size of TiH 2 is 44 μm, the apparent activation energy is reduced by approximately 21.0%. When the particle size is 30 μm, the apparent activation energy remains largely unaffected. However, when the particle size is 10 μm, the apparent activation energy increases by approximately 41.5%.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
ASTRONOMICAL JOURNAL
·
2017
·Vol. 153
·期 3
·138
·
IF 2.609
J. L. Birkby,R. J. de Kok,M. Brogi,H. Schwarz,I. A. G. Snellen
We report the detection of water absorption features in the day side spectrum of the first-known hot Jupiter, 51 Peg b, confirming the star–planet system to be a double-lined spectroscopic binary. We use high-resolution (R\approx 100,000), 3.2\,\mu {\rm{m}} spectra taken with CRIRES/VLT to trace the radial-velocity shift of the water features in the planet's day side atmosphere during 4 hr of its 4.23 day orbit after superior conjunction. We detect the signature of molecular absorption by water at a significance of 5.6\sigma at a systemic velocity of {V}_{\mathrm{sys}}=-33\pm 2 km s−1, coincident with the 51 Peg host star, with a corresponding orbital velocity {K}_{{\rm{P}}}={133}_{-3.5}^{+4.3} km s−1. This translates directly to a planet mass of {M}_{{\rm{p}}}={0.476}_{-0.031}^{+0.032}\,{M}_{{\rm{J}}}, placing it at the transition boundary between Jovian and Neptunian worlds. We determine upper and lower limits on the orbital inclination of the system of 70^\circ \lt i\lt 82\buildrel{\circ}\over{.} 2. We also provide an updated orbital solution for 51 Peg b, using an extensive set of 639 stellar radial velocities measured between 1994 and 2013, finding no significant evidence of an eccentric orbit. We find no evidence of significant absorption or emission from other major carbon-bearing molecules of the planet, including methane and carbon dioxide. The atmosphere is non-inverted in the temperature–pressure region probed by these observations. The deepest absorption lines reach an observed relative contrast of 0.9\times {10}^{-3} with respect to the host star continuum flux at an angular separation of 3 milliarcseconds. This work is consistent with a previous tentative report of K-band molecular absorption for 51 Peg b by Brogi et al.
研究领域:
天文学
·
行星科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Lingling Ge,Shuhui Lu,Rong Guo
Janus emulsions of a polymerizable monomer tripropyleneglycol diacrylate (TP) combined with silicone oil (SO) as inner oil phases and Tween 80 aqueous solution as continuous phase are prepared in a one-step high energy mixing process. The dependence of droplet topology on the concentration of surfactant, TP/SO ratio, and the stirring speed during emulsification is investigated. The result shows that the volume ratio of two oils within an individual droplet changes correspondingly to the total composition of emulsion. Increasing the speed of stirring results in a significant reduction in the droplet size, i.e. a five times increase in the stirring speed produces a droplet size reduction from hundreds to a few microns. What is more important, the topology of Janus drops remains similar for the different preparations. These fundamental investigations illustrate the potential for future Janus particle synthesis in batch scale with a controllable particle topology.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biology-Basel
·
2025
·Vol. 14
·期 1
·51
·
IF 3.5
Ferry Saputra,Tzu-Ming Tseng,Franelyne P. Casuga,Yu-Heng Lai,Chih-Hsin Hung,Chung-Der Hsiao
Simple SummaryMany studies have been developed to calculate the blood flow velocity in adult zebrafish. However, the current method requires high-cost equipment a lot of training before it can be replicated. In this study, we provide a simple, cheap, and non-invasive method to enable the measurement of zebrafish blood flow velocity. By applying the same method as the one previously developed for larvae zebrafish, blood flow velocity can be measured and its sensitivity validated by performing an experiment under several ambient temperature conditions, as well as the presence of a toxicant. The applicability of this method was also checked by applying the same method to other fish. Overall, this method provides an easy, cheap, and robust method that can be used by low- to medium-scale laboratories to contribute to knowledge in the relevant fields.Blood flow is an important physiological endpoint to measure cardiovascular performance in animals. Because of their innate transparent bodies, zebrafish is an excellent animal model for assessing in vivo cardiovascular performance. Previously, various helpful methods for measuring blood flow in zebrafish larvae were discovered and developed. However, an optimized method to measure blood flow in adult zebrafish has not been reported. In this paper, the tail fin region was selected as target for blood flow measurements using the Trackmate method, provided by ImageJ platform. Based on power statistic calculations, the aortic vessel at the tail base was selected, and other parameters, such as ambient temperature, were investigated for method standardization, in order to minimize experimental variation. The method was also validated using fenpropathrin and ponatinib, which showed some cardiac alterations in a previous zebrafish study. We also checked the versatility of this method by following the same setup in black tetra and medaka and found that this method performed well. However, our results show that heavy pigmentation, like that found in tiger barb, and overlapping vessels, like those in parrot fish, make it hard for this method to perform well. Overall, an optimized protocol was used for the first time to measure blood flow velocity in adult wild-type zebrafish without the aid of transgenic lines or fluorescent dye.
研究领域:
生物学
·
医学
·
毒理学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMBUSTION AND FLAME
·
2020
·
IF 4.57
Geyuan Yin,Qunfei Gao,Erjiang Hu,Jiawei Xu,Meng Zhou,Zuohua Huang
Laminar flame speeds of formic acid were measured at equivalence ratios of 0.4–1.6, initial temperature of 423–453 K and atmospheric pressure. Chemical kinetic models (Glarborg model and AramcoMech 3.0) were validated against the present experimental data. Deep kinetic insight was investigated using the present models. In addition, detailed analysis was carried out according to transport, thermal and kinetic effect to find out the totally different performance of these two models. The results show that the simulated laminar flame speeds using Glarborg model match well with experimental data while AramcoMech 3.0 apparently over predicts the laminar flame speeds. HOCO and OCHO are driving species for the laminar flame speed of formic acid. Furthermore, the pathway analysis indicates formic acid is consumed mainly by abstraction reaction with OH, forming OCHO radical, which quickly dissociates to H+CO 2 .
研究领域:
燃烧学
·
化学动力学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
·
2023
·
IF 3.8
Hao Zhang,Haiqiang Yang,Zhengjun Chen,Fang Yuan,Qiang Yang,Bo Liu
The presence of dissolved salts in water inhibits bubble coalescence, facilitating the generation of microbubbles, while also maintaining a tangentially mobile air-water surface. In this study, we investigated the variation of bubble size and gas holdup with gas velocity in NaCl solutions using a rectangular bubble column and interpreted the experimental data using the one-dimensional drift-flux model. For the generated bubbles at the size between 0.4 mm and 1 mm, we found that the Moore model assumes mobile air-water surfaces, rather than the Schiller and Naumann model, should be used to describe the bubble terminal velocity. The latter model, which assumes an immobile air-water surface, has been used successfully to predict two-phase flow in surfactant solutions but would overestimate the gas holdup by almost 100 % for NaCl solutions. This finding emphasizes the crucial role of surface mobility in determining gas holdup. Thus, we propose the use of a one-dimensional drift-flux model, incorporating the Moore model to describe bubble terminal velocity, for microbubble systems with a mobile air-water interface.
研究领域:
化学工程
·
流体力学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Man Wang,Jianqiang Xiao,Jian Zhang,Lei Zhao,Yingdan Song,Zhichao Liu,Ting Wang,Xuhui Xu,Jie Yu
Mechanoluminescence (ML) materials have the ability to emit light under mechanical force, allowing for visible mechanical force distribution and making them valuable for applications in smart textiles and wearable sensors. Detecting the force rate is crucial for applications, such as haptic feedback devices and mechanical monitoring, but visualizing the speed of strain has not been achieved yet. In this study, we have successfully visualized the strain rate by monitoring the ML tailing lengths of red, green, and blue (RGB) ML materials, including CaF 2 : Tm 3+ , CaF 2 : Eu 3+ , and CaF 2 : Tb 3+ phosphors. These materials exhibit varying ML tailing lengths at identical rotation speed of friction force, due to their distinct lifetime of the emitting centers. By incorporating these RGB ML phosphors into a composite film, the discrepancies in ML tailing lengths across different colors become visible, with these differences becoming more pronounced as the rotation speeds rise. Ultimately, the visualization of rotational speed in bearings was achieved successfully based on the vivid color changes in the ML tailing length at different speeds.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Sailing Lei,Zhenzhen Quan,Xiaohong Qin,Jianyong Yu
In electrospinning, the whipping jet plays a significant role in determining the microstructure of electrospun nanofibers . So far, however, it is extremely challenging to control the behavior of whipping jet precisely owing to its small diameter and rapid motion. In the present work, dynamic models are established to predict the velocity of whipping jet, where the velocity is tuned by surface charge. It is found that the variation of velocity of whipping jet with motion time follows a scaling law with an exponent of −1/3. Moreover, the relationship between velocity of whipping jet and axial distance obeys a scaling law with an exponent of −1/2. In addition, the theoretical predictions show a good agreement with the experimental results. This work provides a new strategy for the accurate control of velocity and stretching of whipping jet, promoting the morphological and structural design of electrospun nanofibers .
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Particuology
·
2025
·
IF 4.3
Chao Song,Xuejun Hu,Shuang Yang,Jinxiao Xu,Chang Chen,Guangqing Liu
Due to the low density and hydrophobicity, the corn straw (CS) particles tend to float on the liquid surface in the anaerobic digester, deteriorating the bioconversion efficiency and process stability. Although the mechanical mixing is widely used in digesters, the drawdown and suspension of CS in the non-Newtonian slurry have not been sufficiently studied. This paper investigated the effect of particle size, liquid viscosity, solid phase mass fraction, impeller type and off-bottom distance on the just-drawdown rotational speed ( N jd ), complete drawdown rotational speed ( N cd ) and cloud depth ( CD ) of dry and wet straw particles in the stirred tank. The results showed that the distribution of dry and wet straw in the stirred tank significantly differed due to differences in density and wettability. The models built by dimensional analysis and machine learning were suitable for accurate predictions of specific variables. Based on the model analysis, the N jd of dry straw was mainly affected by the liquid viscosity, impeller type and off-bottom distance, as these factors determined the flow field of liquid phase for its drawdown. N jd of wet straw was related to the liquid viscosity and N cd was influenced by impeller off-bottom distance. The CD of dry and wet straw particles were both affected by rotational speed, impeller type, and liquid viscosity related to the mean flow and turbulence intensity in the tank. The results provide valuable references for the design and operation of mixing configurations for low-density feedstocks in the anaerobic digester.
研究领域:
生物工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2022
·Vol. 7
·期 12
·2200371
·
IF 8.856
MingYang Yang,Guangyou Liu,Zheng Zeng,Shuhao Zhang,Jie Liu,Zong Qin,Zhihe Chen,Bo-Ru Yang
Human–machine interaction will be revolutionarily different in the future Internet of Things (IoT) environments. Many displays will be adopted onto electronic devices to enhance human–device communication, even under a very bright sunlight ambience. Thus, power consumption and sunlight visibility are important attributes for this application. Electrophoretic displays (EPDs) have the inherent advantages of ultra-low power consumption and high sunlight visibility, which are perfectly suitable for IoT applications. The low power consumption resulted from the balance of viscosity, gravity, and other complicated forces involved in the electrophoretic dispersion. This force balance is generally termed “bistability,” meaning the particle-packing can be stable without external power at black and white image states. However, good bistability implies a slow image updating rate, significantly degrades users’ experience. In this work, a 3D network structure that undergoes disruption and reorganization with the particles’ movement is utilized in the electrophoretic ink dispersion. Dynamic viscosity modulation enables the bistable and fast-response dual-working modes. The newly developed design can increase the response speed of EPDs by a factor of 2.38, simultaneously maintaining the bistability. The electronic ink with this reversible network provides a promising solution for the future video-rate e-paper displays.
研究领域:
材料科学
·
电子工程
✓ 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）