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Influence of laser doping on nanocrystalline ZnO thin films gas sensors

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Progress in Natural Science:Materials International 2017年第4期27卷 435-442页

作者： yue hou Ahalapatiya H.Jayatissa Nanotechnology and MEMS laboratory Mechanical Industrial and Manufacturing Engineering (MIME) Department The University of Toledo

The effect of laser doping of Al on the gas sensing behavior of nanocrystalline ZnO thin films is reported. The doping of Al was carried out by the spin-coating of Al-precursors on nanocrystalline ZnO films followed by a pulsed laser irradiation. The laser-doped films were characterized as a function of laser power density by measuring the optical, structural, electrical, morphological and gas sensing properties of ZnO films. It was found that the laser doping process resulted in an increase of electrical conductivity of ZnO films. The performance of gas sensor was investigated for different concentrations of H2and NH3in the air. The results indicate that the laser doping process can be utilized to improve the sensor characteristics such as sensitivity and response time by optimization of laser power density. The optimum laser power is interpreted as the critical power level required to compete the effective doping versus developing the effective grain boundaries. Also, the selectivity of laser-doped ZnO sensors for H2was studied for a likelihood practical gas mixture composed of H2, NH3and CH4. It is found that these films can be optimized to develop H2and NH3sensors in PPM level with a higher selectivity over other reducing gases.

关键词： Laser doping Aluminum doping Gas sensing ZnO Thin film gas sensor

Miura-ori structured flexible microneedle array electrode for biosignal recording

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Microsystems & Nanoengineering 2021年第4期7卷 59-66页

作者： yue hou Zhaoyu Li Ziyu Wang Hongyu Yu Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyKowloonHong Kong SAR 999077China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China

Highly reliable signal recording with low electrode-skin impedance makes the microneedle array electrode(MAE)a promising candidate for biosignal ***,when used in long-term health monitoring for some incidental diseases,flexible microneedles with perfectly skin-tight fit substrates lead to sweat accumulation inside,which will not only affect the signal output but also trigger some skin allergic *** this paper,a flexible MAE on a Miura-ori structured substrate is proposed and fabricated with two-directional in-plane *** results from the comparison tests show enhanced performance in terms of(1)the device reliability by resisting peeling off of the metal layer from the substrate during the operation and(2)air ventilation,achieved from the air-circulating channels,to remove ***-signal recordings of electrocardiography(ECG),as well as electromyography(EMG)of the biceps brachii,in both static and dynamic states,are successfully demonstrated with superior accuracy and long-term stability,demonstrating the great potential in health monitoring applications.

关键词： recording electrode Miura

A state-of-the-art review on interfacial behavior between asphalt binder and mineral aggregate

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Frontiers of Structural and Civil Engineering 2018年第2期12卷 248-259页

作者： Meng GUO Yiqiu TAN Linbing WANG yue hou National CenterJor Materials Service Sa[ety University of Science and Technology Beijing Beijing 100083 China School of Transportation Science and Engineering Harbin Institute of Technology Harbin 150090 China Joint USTB-Virginia Teeh Lab on Multifunctional Materials University of Science and Technology Beijing Beijing 100083 China Virginia Tech Blacksburg VA 24061 USA

The interface between asphalt binder and mineral aggregate directly affects the service life of pavement because the defects and stress concentration occur more easily there. The interaction between asphalt binder and mineral aggregate is the main cause of forming the interface. This paper presents an extensive review on the test technologies and analysis methods of interfacial interaction, including molecular dynamics simulation, phase field approach, absorption tests, rheological methods and macro mechanical tests. All of the studies conducted on this topic clearly indicated that the interfacial interaction between asphalt binder and mineral aggregate is a physical-chemical process, and can be qualitatively characterized by microscopical technique （such as SEM and AFM）, and also can be quantitatively evaluated by rheological methods and interfacial mechanical tests. Molecular dynamics simulation and phase field approach were also demonstrated to be effective methods to study the interfacial behavior and its mechanism.

关键词： Asphalt binder Mineral aggregate Interfacial behavior Multiscale

Constitutive modelling of fabric effect on sand liquefaction

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第4期15卷 926-936页

作者： Zhiwei Gao Dechun Lu yue hou Xin Li James Watt School of Engineering University of GlasgowGlasgowG128QQUK Institute of Geotechnical and Underground Engineering Beijing University of TechnologyBeijing100124China Beijing Key Laboratory of Traffic Engineering Beijing University of TechnologyBeijingChina

Sand liquefaction under static and dynamic loading can cause failure of embankments,slopes,bridges and other important *** liquefaction in the seabed can also cause submarine landslides and *** anisotropy related to the internal soil structure such as particle orientation,force network and void space is found to have profound influence on sand liquefaction.A constitutive model accounting for the effect of anisotropy on sand liquefaction is *** of fabric anisotropy during loading is considered according to the anisotropic critical state theory for *** model has been validated by extensive test results on Toyoura sand with different initial densities and stress *** effect of sample preparation method on sand liquefaction is qualitatively *** model has been used to investigate the response of a sand ground under earthquake *** is shown that sand with horizontal bedding plane has the highest resistance to liquefaction when the sand deposit is anisotropic,which is consistent with the centrifuge test *** initial degree of fabric anisotropy has a more significant influence on the liquefaction *** with more anisotropic fabric that can be caused by previous loading history or compaction methods has lower liquefaction resistance.

关键词： Sand Anisotropy Liquefaction Finite element modelling Constitutive model

Experimental investigation on flow characteristics of deionized water in microtubes

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Chinese Science Bulletin 2007年第6期52卷 849-854页

作者： XU ShaoLiang yue XiangAn hou JiRui Enhanced Oil Recovery Research Center China University of Petroleum Beijing 102249 China

The flow characteristics of deionized water in microtubes with diameters ranging from 2 to 30 μm are investigated. The experimental results show that the flow characteristics in microtubes with diameters of 16 μm and larger ones are in agreement with the classical theory. However, as the diameters are de-creased to 5 and 2 μm, the nonlinear flow characteristics prevail and the results indicate significant departure of flow characteristics from the predictions of the conventional theory, and the smaller the diameters, the larger the departure. As the Reynolds number increases, the degree of nonlinear flow characteristics decrease gradually and the experimental results are approximately equal to the theo-retical expectation. The minimum Reynolds number in this study is only 2.46×10^(-5).

关键词：微管脱离子水流动特性实验研究边界层流体

A review on structures,materials and applications of stretchable electrodes

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Frontiers of Materials Science 2021年第1期15卷 54-78页

作者： Yumeng WANG Xingsheng LI yue hou Chengri YIN Zhenxing YIN Department of Chemistry Yanbian UniversityYanji 133002China

With the rapid development of wearable smart devices,many researchershave carried out in-depth research on the stretchable *** one of the corecomponents for electronics,the electrode mainly transfers the electrons,which plays animportant role in driving the various electrical *** key to the research for thestretchable electrode is to maintain the excellent electrical properties or exhibit theregular conductive change when subjected to large tensile *** articleoutlines the recent progress of stretchable electrodes and gives a comprehensiveintroduction to the structures,materials,and applications,including supercapacitors,lithium-ion batteries,organic light-emitting diodes,smart sensors,and *** comparison of various stretchable electrodes was proposed to clearly showthe development challenges in this *** hope that it can provide a meaningfulreference for realizing more sensitive,smart,and low-cost wearable electrical devices inthe near future.

关键词： wearable smart electronics stretchable electrodes electrode structures elastic substrates conductive materials

Direct Comparison of Crystal Nucleation Activity of PCL on Patterned Substrates

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Chinese Journal of Polymer Science 2019年第7期37卷 693-699页

作者： Jian Hu Rui Xin Chun-yue hou Shou-Ke Yan Ji-Chun Liu Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics Qingdao University of Science & Technology College of Chemical Engineering and Pharmaceutics Key Laboratory of Polymer Science and Nanotechonology Henan University of Science and Technology

A sample containing different regions with poly(ε-caprolactone)(PCL), oriented polyethylene (PE), and oriented isotactic polypropylene (iPP) films in contact with glass slide has been prepared to be observed in the same view field in an optical microscope and the crystallization of PCL in different regions during cooling from 80 °C down to room temperature at a rate of 1 °C·min^-1 was studied. The results showed that the crystallization of PCL started first at the PE surface and then at the iPP surface, while its bulk crystallization occured much later. This indicates that though both PE and iPP are active in nucleating PCL, the nucleation ability of PE is stronger than that of iPP. This was due to a better lattice matching between PCL and PE than that between PCL and iPP. Moreover, since lattice matching existed between every (hk0) lattice planes of both PCL and PE but only between the (100)PCL and (010)iPP lattice planes, the uniaxial orientation feature of the used PE and iPP films resulted in the existence of much more active nucleation sites of PCL on PE than on iPP. This led to the fact that the nucleation density of PCL at PE surface was so high that the crystallization of PCL at PE surface took place in a way like the film developing process with PCL microcrystallites happened everywhere with crystallization proceeding simultaneously. On the other hand, even though iPP also enhanced the nucleation density of PCL evidently, the crystallization of PCL at iPP surface included still a nucleation and crystal growth processes similar to that of its bulk crystallization.

关键词： Poly(ε-caprolactone) Polypropylene Polyethylene Epitaxy Heterogeneous nucleation

Protein hydrogels for biomedical applications

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Biosurface and Biotribology 2024年第3期10卷 106-131页

作者： Xinyi Wang yue hou Xiong Lu Chaoming Xie Yanan Jiang Institute of Biomedical Engineering College of MedicineSouthwest Jiaotong UniversityChengduSichuanChina Key Lab of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengduSichuanChina Obesity and Metabolism Medicine-Engineering Integration Laboratory Department of General SurgeryThe Third People's Hospital of ChengduThe Affiliated Hospital of Southwest Jiaotong UniversityChengduSichuanChina

Hydrogels,characterised as highly hydrophilic three-dimensional polymer networks,have gained increasing attention due to their unique physicochemical properties,finding applications in various *** polymer hydrogels exhibit higher biocompatibility and biodegradability compared to traditional synthetic polymer ***,being the principal materials of natural polymer hydrogels,bear numerous modifiable functional *** resultant hydrogel possesses responsiveness,adjustable degradability,and underway as an excellent *** common raw materials used to construct protein hydrogels are *** terms of comparing natural polymer hydrogels with traditional synthetic polymer hydrogels,the authors conduct a detailed analysis and comparison,highlighting the advantages of natural polymer hydrogels in terms of biocompatibility and biodegradability,and summarising their *** authors also address the limitations of various protein hydrogels and list existing strengthening cross-linking strategies,proposing new insights to overcome the application limits of protein ***,the applications of protein hydrogels in drug delivery,biosensing,bio-inks and tissue engineering are *** authors conclude by summarising the current challenges faced by protein hydrogels and prospecting its future development.

关键词： biomaterials biomedical application

Inflatable hollow obturator prostheses for patients undergoing an extensive maxillectomy:a case report

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International Journal of Oral Science 2012年第2期4卷 114-118页

作者： yue-Zhong hou Zhi Huang Hong-Qiang Ye Yong-Sheng Zhou Department of Prosthodontics Peking University School and Hospital of StomatologyBeijingChina

The presence of a large palatal or maxillary defect after partial or total maxillectomy for tumor, trauma or congenital deformation poses a challenge to prosthodontists, particularly when the use of an implant cannot be considered. This case report described the use of an air valve in a hollow silicone obturator to manufacture an inflatable obturator that could be extended further into undercut area to retain itself. The inflatable obturator exhibited adequate retention, stability and border sealing, thereby improving the masticatory, pronunciation and swallowing functions of patients. It may be a suitable alternative treatment option to an implant-retained obturator.

关键词： inflatable maxillectomy maxillofacial defects obturator silicone