Article
Energy & Fuels
Yan Gu, Jichen Xu, Jieqiong Lin, Haihang Ma, Huibo Zhao, Yishuo Zhang, Baoyu Sun
Summary: This study proposes a vibration-assisted UV nanoimprint lithography technique to effectively improve the power conversion efficiency (PCE) of Si solar cells. By applying piezoelectric vibration, the contact area between the photoresist and the grating's side wall is increased, reducing surface tension and increasing the photoresist filling rate by 25%. The best grating parameters are determined using Finite Difference Time Domain (FDTD) and vibration-assisted UV nanoimprint is used to fabricate the periodic grating structures, resulting in a 25% increase in PCE compared to bare Si solar cells.
Article
Chemistry, Physical
Weilong Wu, Qin Ouyang, Liu He, Qing Huang
Summary: In this study, the optical and thermal properties of polymethyl methacrylate (PMMA) were modulated by introducing phenyl and adamantyl substituents through copolymerization. The results provide a new approach for the application of PMMA in deep UV lithography and antireflective coatings.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Thermodynamics
Alain Alonso, David Lazaro, Mariano Lazaro, Daniel Alvear
Summary: Thermal analysis is an efficient technique widely used in various fields, especially in fire science. The boundary conditions of thermal analysis have a significant impact on the study of polymeric materials, particularly in thermal decomposition reactions. The International Confederation for Thermal Analysis and Calorimetry has established standards for thermogravimetry and differential scanning calorimetry, including recommended sample masses. The influence of self-heating on thermal decomposition is analyzed, and suitable boundary conditions for TG/DSC tests on PMMA and LLDPE are determined. The study provides useful recommendations for thermal analysis.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Multidisciplinary
Christine Thanner, Martin Eibelhuber
Summary: The UV Nanoimprint Lithography is efficient in producing resist layers with features ranging from micrometers to nanometers. Understanding material properties, pattern size, and shape is crucial for optimizing processes for reliable manufacturing. Comparing results for different pattern geometries can provide a helpful overview of relevant process parameters.
Article
Chemistry, Physical
Yan Gu, Yishuo Zhang, Jieqiong Lin, Huibo Zhao, Haihang Ma, Hongwei Yao, Mingshuo Kang, Bin Fu, Silin Liu
Summary: In this study, a piezoelectric-driven vibration-assisted UV nanoimprint method was proposed to improve the performance of diffraction gratings. It was found that introducing one-dimensional lateral vibrations with low frequency and low amplitude improved surface quality and filling rate of the grating. The effects of grating properties and vibration parameters were investigated, and a novel asymmetric vibration stage was designed. The method was verified to accurately fabricate diffraction gratings with superior performance.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Polymer Science
Lijun Li, Yiben Zhang, Lingyu Sun, Huipeng Hu
Summary: This paper investigates the strain rate and temperature dependent mechanical behavior of PMMA through experimental research. The results show that PMMA is sensitive to both strain rate and temperature, and the strain rate effect is reduced at high temperatures. CM207 PMMA and PFE50 PMMA exhibit differences in strain rate and temperature sensitivity.
Article
Physics, Applied
S. M. Torres, O. Y. Vorobiev, R. E. Robey, M. J. Hargather
Summary: This study investigates the fracture response of geologic materials under explosive loading using a transparent rock surrogate, PMMA. High-speed imaging and PDV were used to capture the shock propagation and fracture growth processes. The experimental results were compared to numerical simulations, showing good agreement in fracture lengths. The simulation analysis revealed that the shock drives the fracture for approximately 20 μs.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Manufacturing
Yan Gu, Si Chen, Jieqiong Lin, HongYu Xu, XianYao Li
Summary: The anti-reflection nanopillar structures layer prepared by the non-resonant vibration-assisted UV nanoimprint lithography has better surface morphology and higher filling rate, with a 39% increase in filling rate and a 68% reduction in reflectivity, leading to a 21.07% improvement in power conversion efficiency of solar cells.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Thermodynamics
Junhui Gong, Zhixuan Zhu, Mingrui Zhang, Chunjie Zhai, Xuan Wang
Summary: This study experimentally investigates piloted ignition of vertically mounted solid and analyzes the results using numerical and analytical models. The effects of ignitor position on ignition time and critical ignition parameters are examined. The results show that top ignitor shortens ignition time and reduces critical temperature and critical mass loss rate.
APPLIED THERMAL ENGINEERING
(2022)
Article
Materials Science, Characterization & Testing
Yang Pan, Bin Yang, Ning Jia, Yangnan Yu, Xiang Xu, Yingying Wang, Bin Wu, Jiasheng Qian, Ru Xia, Chenjun Wang, Aiqing Sun, You Shi
Summary: In this study, graphene nanoplatelets filled polymethyl methacrylate composites were prepared using the multi-layer hot pressing method. The effect of GNP content on the viscoelastic behavior and thermomechanical properties of the composites was investigated. Results showed that a thermal rheological complexity emerged at elevated GNP content, indicated by infrared thermal imaging, which also revealed the formation of a conductive network with increasing filler content. The addition of GNP increased the glass transition temperature of PMMA, leading to enhanced thermophysical properties and excellent mechanical performance of the composites even at high temperatures.
Article
Chemistry, Multidisciplinary
Jun Iwata, Tadashi Ando
Summary: In this study, molecular dynamics simulations were used to investigate the filling process of few-nanometer-wide trenches in UV-NIL. The results showed that resist materials with low viscosities were able to successfully fill the trenches, while resist materials with high viscosity could not. The study also compared the properties of linear photopolymers and found that TPGDA, which is more flexible and can adopt more conformations, had a higher probability of intra-molecular crosslinking. These findings provide valuable information for selecting and designing resists for fine patterning in UV-NIL.
Article
Nanoscience & Nanotechnology
Alejandra Jacobo-Martin, Jaime J. Hernandez, Patricia Pedraz, Eduardo Solano, Ivan Navarro-Baena, Isabel Rodriguez
Summary: The thermal stability of antireflective moth-eye topographical features fabricated by nanoimprint lithography on PMMA incorporating TiO2 nanoparticles is greatly improved, delaying pattern relaxation and enhancing pattern stability even at high temperatures. This enhancement in thermal behavior will significantly improve the functionality and performance of the antireflective films, especially in light-trapping applications where temperatures typically rise.
Article
Chemistry, Physical
Alejandra Jacobo-Martin, Jaime J. Hernandez, Eduardo Solano, Miguel A. Monclus, Juan Carlos Martinez, Daniel F. Fernandes, Patricia Pedraz, Jon M. Molina-Aldareguia, Tomas Kubart, Isabel Rodriguez
Summary: Moth-eye nanostructures have various functionalities, but their poor mechanical resilience and durability limit their practical applications. In this study, a thin oxide coating is used to protect the nanostructures and improve their thermal stability and self-cleaning functionality.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Biomedical
Mahya Ganjian, Khashayar Modaresifar, Dionysios Rompolas, Lidy E. E. Fratila-Apachitei, Amir A. A. Zadpoor
Summary: Developing a high-throughput nanopatterning technique with precise control over feature dimensions is crucial for studying cell-nanopattern interactions. This study presents a process that fulfills these criteria by using electron-beam lithography to fabricate controlled arrays of submicron pillars and developing etching procedures to create the desired height. The study demonstrates the significance of the fabricated pillars in inducing osteogenic differentiation and utilizes replication techniques to pattern bio-instructive surfaces. Overall, the method enables the precise fabrication of submicron and nanopatterns for systematic cell studies.
ACTA BIOMATERIALIA
(2022)
Review
Polymer Science
Faris A. Alshahrani, Fatemah AlToraibily, Maryam Alzaid, Amr A. Mahrous, Maram A. Al Ghamdi, Mohammed M. Gad
Summary: This study reviewed the literature on the impact of salivary pH on the performance and materials used for removable dental prostheses (RDP). The findings suggest that salivary pH has an effect on RDP materials, with alkaline and acidic pH having the most significant impact. The salivary pH should be considered when selecting materials for RDP fabrication.
Article
Optics
Xiaoqin Zhou, Hao Liu, Yucheng Li, Meng Ma, Qiang Liu, JieQiong Lin
Summary: This paper studies the influence of vibrations on the imaging quality of the integrated TDICCD aerial camera and establishes mathematical models to analyze the relationship between vibration responses of structures and imaging quality. With simulation imaging and multiple tests, the accuracy of the models is verified, showing a rapid decrease in imaging quality with increasing acceleration excitation.
Article
Optics
Jieqiong Lin, Jiahang Tian, Mingming Lu, Tonghuan Ran, Jiakang Zhou
Summary: This paper establishes a mathematical model to analyze the impact of carrier aircraft vibration on the imaging quality of an aspherical aerial camera, and validates the model through simulation and experiment analysis, providing theoretical guidance for aerial camera optimization design.
Article
Engineering, Multidisciplinary
Yan Gu, Mingshuo Kang, Jieqiong Lin, Ao Liu, Bin Fu, Penghui Wan
Summary: The study introduces a vibration-assisted magnetorheological finishing method to enhance the shearing effects of polishing. Experimental results show that variations in vibration parameters affect surface quality and polishing forces, with higher amplitudes and frequencies leading to better surface quality.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2021)
Article
Chemistry, Analytical
Jiakang Zhou, Jieqiong Lin, Mingming Lu, Xian Jing, Yubo Jin, Dunlan Song
Summary: The study found that using models with irregular polygonal particles in the cutting simulation process for metal matrix composites is closer to the actual microstructure, better reflects particle deformation behavior, and captures more details of the impact caused by particles on cutting forces.
Article
Materials Science, Composites
Jiakang Zhou, Jieqiong Lin, Mingming Lu, Xiaoqin Zhou, Yongsheng Du, Chao Wang
Summary: This paper proposed a geometric model of cutting force to predict the cutting force and monitor the cutting state during machining of SiCp/Al composites. The validity of the model was confirmed, and the applicability of the model under different volume fractions of SiCp/Al composites was studied.
APPLIED COMPOSITE MATERIALS
(2021)
Article
Engineering, Industrial
Yihang Fan, Yongshuo Xu, Zhaopeng Hao, Jieqiong Lin
Summary: The study shows that the presence of SiC particles changes the microstructure of the matrix material, leading to a high strain gradient in the matrix which makes the material more prone to shear deformation localization. During the cutting process, defects and breakage of SiC particles result in the formation of micro-cracks, which play a key role in chip generation. By comparing simulation and experimental results, it is found that the established theoretical model based on strain gradient better reflects the cutting process of particle-reinforced metal matrix composites.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Xulong Zhuang, Mingming Lu, Jiakang Zhou, Jieqiong Lin, Weixing Li
Summary: By optimizing the shape of the arc permanent magnet through finite element simulation, the polishing efficiency of planar optical elements can be improved, resulting in better processing quality. Experimental results demonstrate that the use of arc permanent magnets can significantly reduce surface roughness and improve surface accuracy.
MATERIALS AND MANUFACTURING PROCESSES
(2022)
Article
Engineering, Mechanical
Jieqiong Lin, Chao Wang, Mingming Lu, Jiakang Zhou, Shixin Zhao, Yuyang Liu
Summary: The study developed a cutting force prediction model for ultrasonic vibration-assisted turning of SiCp/Al composites, effectively reducing the difficulty of machining and improving machinability. The feasibility of ultrasonic vibration-assisted turning was verified, and systematic analysis of cutting force was conducted.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2022)
Article
Chemistry, Analytical
Xifeng Fu, Hong Gong, Mingming Lu, Jiakang Zhou, Jieqiong Lin, Yongsheng Du, Ruiqi Zhou
Summary: This study proposed a piezoelectric hysteresis modeling method based on a generalized Bouc-Wen model, and used an improved flower pollination algorithm (IFPASO) to identify model parameters. Experimental results showed that the model identified by IFPASO had high modeling accuracy, effectively describing the piezoelectric hysteresis characteristics of the 3D-EVC system.
Article
Chemistry, Multidisciplinary
Xian Jing, Wenfang Si, Jie Sun, Jiakang Zhou, Jieqiong Lin, Baojun Yu, Mingming Lu
Summary: This study utilized two-photon polymerization technology to measure the surface topography of crescent arrays in the Nepenthes slippery zone, proposing an outside-in scanning method to address issues in bionic crescent array surface fabrication. It systematically investigated the geometric parameters of BCAS and used perfluorinated polyether oil and fluorocarbon solvent to enhance hydrophobicity. Additionally, anisotropic wetting research was conducted, revealing the effects of offset and outer-inner radius ratio on contact angle differences and observing spreading and pinning phenomena caused by droplet anisotropic wetting.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Analytical
Shiyu Li, Jinguo Han, Haiqiang Yu, Jinhui Wang, Mingming Lu, Yebing Tian, Jieqiong Lin
Summary: This paper adopts the finite element method to study the cutting force and residual stress of titanium alloy in elliptical vibration cutting. The study finds that cutting speed, vibration amplitude, vibration frequency, and depth of cut have significant effects on the principal cutting force. Furthermore, the 3D EVC method can easily generate a compressive stress layer near the machined surface, which improves the working performance of the workpiece.
Article
Engineering, Electrical & Electronic
Tonghuan Ran, Guangfeng Shi, Jieqiong Lin, Linghe Meng
Summary: In order to obtain high-resolution and high-precision images, an aviation remote sensing stabilization platform (ARSSP) is used to isolate unpredictable aerial camera movements. However, nonlinear interferences in the ARSSP system, such as interaxle coupling interference, adversely affect the imaging quality. To address this problem, a dynamic model of moment coupling between shafts is derived and a nonlinear cross feedback decoupling scheme is adopted. The results show that the SMC-CMAC significantly reduces the interaxle coupling effect and nonlinear interference, resulting in improved tracking performance of the ARSSP system.
Review
Engineering, Mechanical
Dunlan Song, Hongguang Du, Jieqiong Lin, Xiaoqin Zhou, Rongqi Wang
Summary: The magnetorheological jet polishing (MJP) technique is a revolutionary flexible contact polishing approach suitable for the smooth and ultra-smooth machining of functional surfaces with tiny or microstructures. It does not require machine tool accuracy and offers advantages such as high efficiency, minimal surface damage, great surface shape adaptation, and superior material removal process selectivity.
Article
Engineering, Mechanical
Yongsheng Du, Mingming Lu, Hao Wang, Jiakang Zhou, Jieqiong Lin
Summary: The study utilizes a glowworm algorithm to optimize the parameters of a robust adaptive fuzzy controller in an EVC system, achieving optimal control accuracy through simulation and closed-loop testing experiments. Results show a significant reduction in surface roughness value of workpieces cut with the optimal controller parameters, verifying the effectiveness of the optimization.
MECHANICAL SCIENCES
(2021)
Article
Engineering, Manufacturing
Jianzhong Chen, Mingming Lu, Jieqiong Lin, Jiakang Zhou, Xifeng Fu, Xiaoqin Zhou
Summary: This paper proposes a grating coloring manufacturing method based on three-dimensional elliptical vibration cutting and non-resonant piezoelectric actuator, and establishes an effective cutting depth model. The nonlinear interaction of machining parameters on the geometry of the grating was analyzed, and experimental results were in agreement with the theory.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
(2021)
