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Adsorption of Dyes Using Multi-walled Carbon Nanotube Hydrogel

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Chemical Research in Chinese Universities 2019年第2期35卷 311-318页

作者： YU Meng liu miao College of New Energy and Environment Jilin UniversityChangchun 130012P.R.China

The hydrophilic multi-walled carbon nanotube(MWCNT)hydrogel was prepared using acrylic acid,acrylamide and hydrophilic *** orthogonal experiment was applied to optimize the synthetic *** MWCNT hydrogel was characterized by Fourier transform infrared spectrophotometer(FTIR)and scanning electron microscopy(SEM)*** MWCNT hydrogel was used as the adsorbent to adsorb water-soluble cationic *** study evaluated the adsorption performance of hydrogels on four dyes of safranine Ts crystal violet,malachite green and methylene blue in *** effects of the amount of hydrogel,the size of hydrogel,pH;and the temperature on the adsorption performance were *** adsorption kinetic and adsorption isotherm curves were *** experimental results show that the MWCNT hydrogel can be easily separated from water and the adsorption capacity is much greater compared to the hydrogel without *** MWCNT hydrogels can be used in wastewater treatment with a great potential.

关键词： Multi-walled carbon nanotube Poly(acrylamide/acrylic acid) Hydrogel Dye Adsorption

Chemical Versus Thermal Folding of Graphene Edges

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Nano Research 2011年第12期4卷 1242-1247页

作者： Ninghai Su miao liu Feng liu Department of Materials Science and Engineering University of Utahi Salt Lake City UT 84112 USA

Using molecular dynamics （MD） simulations, we have investigated the kinetics of the graphene edge folding process. The lower limit of the energy barrier is found to be -380 meV/A （or about 800 meV per edge atom） and -50 meV/A （or about 120 meV per edge atom） for folding the edges of intrinsic clean single-layer graphene （SLG） and double-layer graphene （DLG）, respectively. However, the edge folding barriers can be substantially reduced by imbalanced chemical adsorption, such as of H atoms, on the two sides of graphene along the edges. Our studies indicate that thermal folding is not feasible at room temperature （RT） for clean SLG and DLG edges and is feasible at high temperature only for DLG edges, whereas chemical folding （with adsorbates） of both SLG and DLG edges can be spontaneous at RT. These findings suggest that the folded edge structures of suspended graphene observed in some experiments are possibly due to the presence of adsorbates at the edges.

关键词： Adsorption graphene kinetics molecular dynamics

Effects of geometric configuration on droplet generation in Y-junctions and anti-Y-junctions microchannels

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Acta Mechanica Sinica 2015年第5期31卷 741-749页

作者： Zhao-miao liu Li-Kun liu Feng Shen College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology

Droplets generation in Y-junctions and anti-Yjunctions microchannels are experimentally studied using a high speed digital microscopic system and numerical *** configuration of a microchannel,such as Y-angle（90°,135°,-90° and-135°）,channel depth and other factors have been taken into *** is found that droplets generated in anti-Y-junctions have a smaller size and a shorter generation cycle compared with those in Yjunctions under the same experimental *** observing the internal velocity field,the vortex appearing in continuous phase in anti-Y-junctions is one of the key factors for the difference of droplet size and generation *** is found that droplet size is bigger and generation cycle is longer when the absolute angle value of the intersection between the continuous and the dispersed phases（i.e.,the angle between the main channel and the continuous phase or the dispersed phase channel） *** droplet＇s size is influenced by the Y-angle,which varies with the channel depth in *** Y-angle has a positive effect on the droplet generation cycle,but a smaller height-width ratio will enhance the impact of a continuous and dispersed phase＇s intersection angle on the droplet generation cycle in Y-junctions microchannels.

关键词： Microfluidics Y-junctions and anti-Yjunctions microchannels Y-angle Height-width ratio in cross section

维普期刊数据库

Distributional Escape Time Algorithm Based on Generalized Fractal Sets in Cloud Environment

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Chinese Journal of Electronics 2015年第1期24卷 124-127页

作者： liu miao liu Shuai FU Weina ZHOU Jiantao College of Computer Science and Technology Jilin University College of Computer Inner Mongolia University School of Physical Science and Technology Inner Mongolia University

Since fractal is widely used in all science domains today, escape time algorithm, which is the most effective algorithm in drawing fractal figures, shows negatively when generation function is complex. In this paper,we improve classic escape time algorithm into cloud environment to improve its performance. At first, we provide a separation method of escape algorithm in cloud environment. Then we calculate complexity of the novel algorithm with a probability model based on allocation policy. At last, we use generalized fractal sets as experimental subjects to validate our conclusion. Experimental results show correctness and rapidness of the novel algorithm.

关键词： Escape time algorithm Fractal Distribution probability model Cloud environment.

Recent breakthrough in AI-driven materials science:tech giants introduce groundbreaking models

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Materials Futures 2024年第2期3卷 170-174页

作者： miao liu Sheng Meng Institute of Physics Chinese Academy of SciencesBeijing 100190People’s Republic of China Songshan Lake Materials Laboratory DongguanGuangdong 523808People’s Republic of China

A close look at Google’s GNoME inorganic materials dataset(Merchant et al 2023 Nature 62480–85),and 11 things you would like to know.

关键词： AI GNoME dataset AI+materials science

A novel autonomous self-assembly distributed swarm flying robot

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Chinese Journal of Aeronautics 2013年第3期26卷 791-800页

作者： Wei Hongxing Li Ning liu miao Tan Jindong School of Mechanical Engineering and Automation Beihang University Shanghai Institute of Microsystem and Information Technology Biomedical Engineering Department University of Tennessee

Swarm intelligence embodied by many species such as ants and bees has inspired scholars in swarm robotic researches. This paper presents a novel autonomous self-assembly distributed swarm flying robot-DSFR, which can drive on the ground, autonomously accomplish self-assembly and then fly in the air coordinately. Mechanical and electrical designs of a DSFR module, as well as the kinematics and dynamics analysis, are specifically investigated. Meanwhile, this paper brings forward a generalized adjacency matrix to describe configurations of DSFR structures. Also, the distributed flight control model is established for vertical taking-off and horizontal hovering, which can be applied to control of DSFR systems with arbitrary configurations. Finally, some experiments are carried out to testify and validate the DSFR design, the autonomous self-assembly strategy and the distributed flight control laws.

关键词： Distributed control Flight control system Flying robot Self assembly Swarm intelligence

维普期刊数据库

Pull-through capacity of bolted thin steel plate

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Frontiers of Structural and Civil Engineering 2020年第5期14卷 1166-1179页

作者： Zhongwei ZHAO miao liu Haiqing liu Bing LIANG Yongjing LI Yuzhuo ZHANG School of Civil Engineering Liaoning Technical UniversityFuxin 123000China Department of Civil Engineering Shenyang Jianzhu UniversityShenyang 110168China

The loading capacity in the axial direction of a bolted thin steel plate was investigated.A refined numerical model of bolt was first constructed and then validated using existing experiment *** analysis was performed to reveal the influences of geometric parameters,including the effective depth of the cap nut,the yield strength of the steel plate,the preload of the bolt,and shear force,on the ultimate loading ***,an analytical method was proposed to predict the ultimate load of the bolted thin steel *** derived using the numerical and analytical methods were compared and the results indicated that the analytical method can accurately predict the pull-through capacity of bolted thin steel *** work reported in this paper can provide a simplified calculation method for the loading capacity in the axial direction of a bolt.

关键词： bolted thin steel plate refined numerical model loading capacity nonlinear spring element analytical method

Consensus Disturbance Rejection over Uncertain Networks 36

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Consensus Disturbance Rejection over Uncertain Networks

Graphene/γ-AlOOH Hybrids as an Enhanced Sensing Platform for Ultrasensitive Stripping Voltammetric Detection of Pb（II）

第36届中国控制会议

作者： miao liu Zhongkui Li State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceCollege of EngineeringPeking University

ISBN: (纸本)9781538629185

This paper deals with the consensus disturbance rejection problem for networked systems coordinating over uncertain communication *** communication channel of the network is modeled as an ideal transmission system with the unitary transfer function perturbed by a norm-bounded uncertainty,which is particularly susceptible to describe quantization errors and communication noises.A distributed disturbance observer is designed for each agent to estimate the disturbance,based on which an observer-based consensus protocol is proposed by utilizing the uncertain relative state information among neighboring *** conditions in terms of linear matrix inequalities are further derived to design the protocol.

关键词： Consensus disturbance rejection robustness communication uncertainty

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Chemical Research in Chinese Universities 2015年第4期31卷 590-596页

作者： FAN Wei miao Yue'e liu Tianxi State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200433 P. R. China

The reduced graphene oxide（RGO）/γ-A1OOH hybrids with different γ-AlOOH contents were successfully prepared via a facile one-pot hydrothermal method. In these hybrids, RGO acts as a conductive linker for improving electron transport, and γ-AlOOH nanoplatelets help to adsorb the target metal ions on the electrode surface, thus faci- litating the electrochemical behavior of the hybrids. The sensitivity of as-prepared RGOγ-AlOOH hybrids toward Pb（II） was tested by square wave anodic stripping voltammograms（SWASV）and the mass ratio of graphene to γ-AlOOH was optimized to improve the sensing performance of RGOγ-AlOOH hybrids. Owing to the superior ab- sorbability of γ-AlOOH for heavy metal ions and excellent electrical conductivity of graphene, the detection limit of the hybrids for heavy metal ions was found to be as low as 1.5× 10^-11 mol/L with optimized γ-AlOOH content in the hybrids. The experimental conditions, such as pH value, mass of electrode material, and deposition time were also investigated and optimized. The as-prepared RGOγ-AlOOH hybrids demonstrate high electrochemical activity and good sensing performance, which offers an alternative platform for the electrochemical sensors.

关键词： Graphene γ-AlOOH Hybrid Heavy metal ion Electrochemical sensor