Wei Qiu

Nanjing Tech University

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Co-Authors

Juan C. Nino

University of Florida

Xiaozu Wang

Nanjing Tech University

Nikolas J. Podraza

University of Toledo

Scott S. Perry

Louisiana State University

Zhaohui Wang

Nanjing Tech University

Zhaoliang Cui

Nanjing Tech University

Hong‐Bin Luo

Nanjing Tech University

Xiaole Guo

Chongqing University of Science and Technology

Zhizhong Li

China Southern Power Grid (China)

LI Xiang-yang

British Geological Survey

Cooperative Institutions

Nanjing Tech University

University of Florida

Guizhou University

The Synergetic Innovation Center for Advanced Materials

Chinese Academy of Sciences

Pennsylvania State University

Oak Ridge National Laboratory

Ministry of Education of the People's Republic of China

Guangdong University of Technology

Chinese Academy of Medical Sciences & Peking Union Medical College

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Experimental Analysis of Mechanics Problem within Soft Material Contact Field in Large Deformation

Journal of Experimental Mechanics (2010)

Wei Qiu

An experimental measurement technique was developed and presented in this paper for solving the mechanics problem emerged in the contact field formed by a rigid indenter and rubber-like soft material with large deformation.The soft material being studied is a kind of vulcanized silicone rubber,and the in-plane deformation of a large deformation field is measured by digital moiremethod. As the specimen is in large deformation and the contact with wedge-shape indenter occurs in the specimen,an inner-grating technology is presented,and its principle and implementation method is introduced in the paper.The vertical and horizontal displacement field was obtained by digital image processing method.Then,deformation characteristics and experimental sector division properties in the vicinity of contact edge were analyzed according to the results of in-plane deformation.Further, the strain distribution near the contact area can be provided by agrid deformation method,based on large deformation theory.The data were directly obtained from experimental results,so it’s intuitive and reliable.

Silicone rubber

Wedge (geometry)

Contact Mechanics

Displacement field

Digital image correlation

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Synthesis and luminescence properties of CaB4O7:Eu3+ via two-step hydrothermal method

Optik (2019)

Wei Qiu Xiaoqin Feng Hongyan Zhang Hongsheng Huang

Emission intensity

Hydrothermal Synthesis

Intensity

10.1016/j.ijleo.2019.01.109

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Citations (4)

Interfacial Reactivity of Au, Pd, and Pt on BiI₃ (001): Implications for Electrode Selection

ACS Applied Materials & Interfaces (2011)

Wei Qiu Gregory J. Dudder Xueying Zhao Scott S. Perry Juan C. Nino

Understanding the contact-semiconductor interface is important in determining the performance of a semiconductor device. This study investigated the contact chemistry of BiI(3) single crystal with Au, Pd, and Pt electrodes using X-ray photoelectron spectroscopy (XPS), a technique widely used to probe the interfacial chemistry of many materials. Chemical reactions were identified on the BiI(3) surface for the case of Pd and Pt contacts, while Au showed no reactivity with BiI(3). The difference in reactivities correlated with different surface morphologies of the contact on the BiI(3) surface, which was evidenced by atomic force microscopy (AFM) characterization. The dark resistivity of the BiI(3) crystal with above contact materials was measured by I-V characterization. The highest resistivity was obtained when Au was employed as the contact. These results suggest that Au is better than Pd and Pt as the contact material for BiI(3) single crystal.

Characterization

Reactivity

Crystal (programming language)

10.1021/am200120j

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Citations (17)

Fabrication of highly selective hollow fiber membranes based on P84/PES blends for CO₂/CH₄ separation

Environmental Progress & Sustainable Energy (2023)

Wei Qiu Jing Dai Hua-Jiang Wang Zhaoliang Cui Zhaohui Wang

Abstract In this study, the aim was to purify CH 4 , an efficient and renewable clean energy source, which often contains CO 2 that needs to be removed to improve its combustion efficiency. To achieve this, hybrid hollow fiber membranes were developed using BTDA‐TDI/MDI (P84) and polyethersulfone (PES) through a dry jet‐wet spinning process. The effects of different parameters, including core liquid composition, solidification bath composition and temperature, spinneret temperature, and air gap distance, were studied to optimize membrane structure, morphology, and CO 2 /CH 4 separation performance. The P84/PES hollow fiber membrane obtained through this process demonstrated good CO 2 /CH 4 separation performance, with CO 2 permeation of 2.12 GPU and a selectivity of 51.23. To further improve the membrane's performance, a coating of poly(ether block‐amide) (PEBA) was applied to the P84/PES hollow fiber membrane. This modification resulted in a P84/PES‐PEBA hollow fiber membrane with increased CO 2 affinity due to the polar poly(ethylene oxide) groups of PEBA. The P84/PES‐PEBA hollow fiber membrane exhibited high selectivity of 56.5 and CO 2 permeance of 1.42 GPU at 25°C.

Permeance

Hollow fiber membrane

10.1002/ep.14265

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Citations (1)

The Improvement of Technic of Substituting Purified Industrial Salt for Raw Salt in Electrolyzing Salty Water

Sea-lake Salt and Chemical Industry (2007)

Wei Qiu

For solving the market of purified industrial Salt,Tianjin Changlu Hangu Salt Works cooperated with Bohai Tianhua Co.,Ltd,to seek the improving measurement of technic of purified industrial salt.By researching and demonstrating in Taiyuan chemical factory,the improved technic of purification of salty water was implemented in Bohai Tianhua Co.,Ltd.The result shows that there is a good market for purified industrial salt.

Salt solution

Salt water

Factory (object-oriented programming)

Purified water

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Band gap and structure of single crystal BiI3: Resolving discrepancies in literature

Journal of Applied Physics (2013)

Nikolas J. Podraza Wei Qiu Beverly Brooks Hinojosa Haixuan Xu Michael A. Motyka

Bismuth tri-iodide (BiI3) is an intermediate band gap semiconductor with potential for room temperature gamma-ray detection applications. Remarkably, very different band gap characteristics and values of BiI3 have been reported in literature, which may be attributed to its complicated layered structure with strongly bound BiI6 octahedra held together by weak van der Waals interactions. Here, to resolve this discrepancy, the band gap of BiI3 was characterized through optical and computational methods and differences among previously reported values are discussed. Unpolarized transmittance and reflectance spectra in the visible to near ultraviolet (UV-Vis) range at room temperature yielded an indirect band gap of 1.67 ± 0.09 eV, while spectroscopic ellipsometry detected a direct band gap at 1.96 ± 0.05 eV and higher energy critical point features. The discrepancy between the UV-Vis and ellipsometry results originates from the low optical absorption coefficients (α ∼ 102 cm−1) of BiI3 that renders reflection-based ellipsometry insensitive to the indirect gap for this material. Further, electronic-structure calculations of the band structure by density functional theory methods are also consistent with the presence of an indirect band gap of 1.55 eV in BiI3. Based on this, an indirect band gap with a value of 1.67 ± 0.09 eV is considered to best represent the band gap structure and value for single crystal BiI3.

Ellipsometry

10.1063/1.4813486

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Citations (125)

Electrochemical Impedance Studies on the Corrosion of Cu- 35Ni-10Al Alloy in a Molten (0.62Li, 0.38K)2CO3 Environment

International Journal of Electrochemical Science (2019)

Yanjie Ren Yucheng Peng Jian Chen Wei Qiu Wei Li

10.20964/2019.07.49

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Citations (3)

4-kW 3-phase rectifier with high efficiency and wide operational range via 3-mode SVPWM

Journal of Power Electronics (2020)

Jiaqing Lin Zhizhong Li Bo Zhang Guidong Zhang Wei Qiu

Rectifier (neural networks)

Mode (computer interface)

Three-phase

10.1007/s43236-020-00140-5

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Citations (2)

A Mainlobe Jamming Suppression Method Based on Spatial Spectrum Estimation Oblique Proj ection Filtering in Beam Space

Leida Kexue Yujishu (2019)

Xiaole Guo LI Xiang-yang Wei Qiu

Spatial filter

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Phase transition and ionic conduction enhancement induced by co-doping of LiI and MnI₂ in a one-dimensional lead iodide perovskite

Chemical Communications (2023)

Ya-Ru Kong Wei Qiu Zhang Guo-qin Dong-Sheng Shao Xiaozu Wang

Herein, we demonstrated the unique advantage of a mechanochemical reaction to prepare a salt with hard and soft acid and base ions concurrently by solution synthesis owing to the soft acid preferring to combine with the soft base and vice versa. We prepared Bu4N1-xLixMnxPb1-xI3 (x = 0.011-0.14) by mechanochemical synthesis. The doping induced a structural phase transition at ∼342 K and much enhancement of ionic conduction above 342 K for all co-doped hybrids regarding Bu4NPbI3 because of the voids around the Mn2+/Li+ ions by doping.

Base (topology)

10.1039/d3cc02099a

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