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Reduced graphene oxide-mediated electron-hole separation using titanium dioxide increases the photocatalytic antibacterial activity of bone scaffolds

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Bio-Design and Manufacturing 2025年第1期8卷 100-115,I0044页

作者： Pei Feng Haifeng Tian Feng Yang Shuping Peng Hao Pan Cijun Shuai state key laboratory of precision Manufacturing for Extreme Service Performance College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China NHC key laboratory of Carcinogenesis of Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine Cancer Research InstituteSchool of Basic Medical ScienceCentral South UniversityChangsha 410013China RESEARCH ARTICLE The key laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education of Xiangya Hospital and School of Basic Medical Science Central South UniversityChangsha 410013China Department of Periodontics&Oral Mucosal Section Xiangya Stomatological Hospital&Xiangya School of StomatologyCentral South UniversityChangsha 410013China Institute of Additive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013China College of Mechanical Engineering Xinjiang UniversityUrumqi 830017China

Fast electron-hole recombination issues during titanium dioxide(TiO_(2))photocatalysis limit its application in preventing bacterial infection during bone defect *** this study,TiO_(2)@reduced graphene oxide(rGO)composites were synthesized using a hydrothermal method in which rGO,which possesses very high electrical conductivity,promotes the separation of photoelectron-hole pairs of TiO_(2),thus improving the efficiency of photocatalytic production of reactive oxygen species(ROS).Subsequently,TiO_(2)@rGO composites were introduced into poly-L-lactic acid(PLLA)to prepare bone scaffolds with photocatalytic antibacterial function via selective laser *** results showed that TiO_(2)grew on the surface of rGO and formed a covalent bond connection(Ti-O-C)with rGO.A decreased electrochemical impedance of TiO_(2)@rGO composites was observed,and the transient photocurrent intensity increased from 0.05 to 0.5μA/cm^(2).Analysis of electron spin resonance found that the photocatalytic products of TiO_(2)were·OH and·O^(2-),two kinds of ROS capable of killing bacteria via disrupting the structure of the bacterial membrane in *** experiments showed that the PLLA/TiO_(2)@rGO scaffolds had good antibacterial properties against Escherichia coli and Staphylococcus ***,we report that these scaffolds exhibited both enhanced mechanical properties due to the addition of TiO_(2)@rGO as a reinforcement material and good biocompatibility during cell proliferation.

关键词： Reduced graphene oxide Photocatalysis Reactive oxygen species Antibacterial properties Bone scaffold

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Highly sensitive and stretchable piezoelectric strain sensor enabled wearable devices for real-time monitoring of respiratory and heartbeat simultaneously

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Nanotechnology and precision Engineering 2022年第1期5卷 12-23页

作者： Zhenjie Ji Menglun Zhang state key laboratory of precision measuring technology and instruments Tianjin UniversityTianjin 300072China

The World Health Organization has declared COVID-19 a *** demand for devices or systems to diagnose and track COVID-19 infections noninvasively not only in hospitals but also in home settings has led to increased interest in consumer-grade wearables.A common symptom of COVID-19 is dyspnea,which may manifest as an increase in respiratory and heart *** this paper,a novel piezoelectric strain sensor is presented for real-time monitoring of respiratory and heartbeat signals.A highly sensitive and stretchable piezoelectric strain sensor is fabricated using a piezoelectric film with a serpentine *** thickness of the patterned PVDF flexible piezoelectric strain sensor is only 168μm,and the voltage sensitivity reaches 0.97 mV/με.The effective modulus is 13.5 MPa,which allows the device to fit to the skin and detect the small strain exhibited by the human *** vibrations are captured by the piezoelectric sensor,which produces an electrical output voltage signal conformally mapped with respiratory–cardiac *** separate heart activity and respiratory signals are extracted from the mixed respiratory–cardiac signal by an empirical mode decomposition data processing *** detecting vital signals such as respiratory and heart rates,the proposed device can aid early diagnosis and monitoring of respiratory diseases such as COVID-19.

关键词： Physiological signal Strain sensor High sensitivity Flexibility Early diagnosis COVID-19

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An optical tweezer-based microdroplet imaging technology

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Nanotechnology and precision Engineering 2023年第3期6卷 27-33页

作者： Cong Zhai Yujian Hong Zuzeng Lin Yulu Chen Han Wang Tong Guo Chunguang Hu state key laboratory of precision measuring technology and instruments Tianjin UniversityTianjin 300072China

Microspheres can break the diffraction limit and magnify nano-structure imaging,and with its advantages of low cost and label-free operation,microsphere-assisted imaging has become an irreplaceable tool in the life sciences and for precision ***,the tiny size and limited imaging field of traditional solid microspheres cause difficulties when imaging large sample ***,droplets have similar properties to those of microspheres,with large surface curvature and refractive-index difference from the surrounding environment,and they can also serve as lenses to focus light for observation and *** work has shown that droplets with controllable size can be generated using an optical tweezer system and can be driven by optical traps to move precisely like solid ***,a novel microdroplet-assisted imaging technology based on optical tweezers is proposed that better integrates the generation,manipulation,and utilization of droplets.

关键词： Optical tweezers Photogenerated droplets Assisted imaging Controllable generation

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Superhydrophilic–superhydrophobic patterned surfaces:From simplified fabrication to emerging applications

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Nanotechnology and precision Engineering 2022年第3期5卷 55-79页

作者： Hao Chen Xiaoping Li Dachao Li state key laboratory of precision measuring technology and instruments Tianjin UniversityTianjin 300072China

Superhydrophilic–superhydrophobic patterned surfaces constitute a branch of surface chemistry involving the two extreme states of superhydrophilicity and superhydrophobicity combined on the same surface in precise *** surfaces have many advantages,including controllable wettability,enrichment ability,accessibility,and the ability to manipulate and pattern water droplets,and they offer new functionalities and possibilities for a wide variety of emerging applications,such as microarrays,biomedical assays,microfluidics,and environmental *** review presents the basic theory,simplified fabrication,and emerging applications of superhydrophilic–superhydrophobic patterned ***,the fundamental theories of wettability that explain the spreading of a droplet on a solid surface are ***,the fabrication methods for preparing superhydrophilic–superhydrophobic patterned surfaces are introduced,and the emerging applications of such surfaces that are currently being explored are ***,the remaining challenges of constructing such surfaces and future applications that would benefit from their use are discussed.

关键词： Superhydrophobicity Superhydrophilicity Wettability patterns Droplet array Biosensor

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Comparison Between MIR and NIR Spectroscopic Techniques for the Determination of Fat and Protein Contents in Milk

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Transactions of Tianjin University 2007年第5期13卷 375-378页

作者：张学典常敏马真彭丹徐可欣 state key laboratory of precision measuring technology and instruments Tianjin University

To compare mid-infrared(MIR)and near-infrared(NIR)spectroscopies for the determination of the fat and protein contents in milk,the same sample sets with varying concentrations of fat and protein were measured in the MIR range of 3 200-700 cm-1 and NIR range of 9 000-4 000 *** spectral features in the two regions were *** MIR spectra of milk were characteristic due to the MIR inherent molecular specificity,whereas the NIR spectra were relatively characterless due to the NIR low *** least squares(PLS)regression models for fat and protein were developed by using both MIR and NIR *** data with no pretreatment gave better results than NIR *** square correlation coefficient(R2)and the root mean square error of prediction(RMSEP)were 0.98 and 0.10 g/dL for fat and 0.97 and 0.11 g/dL for *** NIR techniques,satisfactory results were not obtained with raw ***,NIR data after pretreatment gave similarly good results to the ones using MIR *** paper indicates that either of the MIR and NIR spectral methods is reliable for the determination of the fat and protein contents.

关键词： mid-infrared spectroscopy near-infrared spectroscopy milk fat protein

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Air-coupled piezoelectric micromachined ultrasonic transducers for surface stain detection and imaging

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Nanotechnology and precision Engineering 2022年第1期5卷 35-42页

作者： Sheng Sun Jianyuan Wang Yuan Ning Menglun Zhang state key laboratory of precision measuring technology and instruments Tianjin UniversityTianjin 300072China

This paper proposes an air-coupled piezoelectric micromachined ultrasonic transducer(PMUT)for detection and imaging of surface stains.A 508 kHz PMUT array is designed,fabricated,and characterized in terms of its electrical and acoustic properties,and it is used in a pulse echo validation *** of stains on metal blocks is successfully *** with existing optical methods for stain detection,the proposed approach can work in a dark environment without color *** work provides a new and promising route for the development of miniaturized stain detection systems.

关键词： PMUT Air-coupled imaging Stain detection Time of flight

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Study of nanoscratching of polymers by using molecular dynamics simulations

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Science China(Physics,Mechanics & Astronomy) 2013年第9期56卷 1760-1769页

作者： YUAN DanDan ZHU PengZhe FANG FengZhou QIU Chen state key laboratory of precision measuring technology and instruments Centre of MicroNano Manufacturing TechnologyTianjin University

Molecular dynamic simulations are performed to study the nanoscratching behavior of *** effects of scratching depth,scratching velocity and indenter/polymer interaction strength are *** is found that polymer material in the scratching zone around the indenter can be removed in a ductile manner as the local temperature in the scratching zone exceeds glass transition temperature *** recovery of polymer can be more significant when the temperature approaches or exceeds *** tangential force,normal force and friction coefficient increase as the scratching depth increases.A larger scratching velocity leads to more material deformation and higher *** tangential force and normal force are larger for a larger scratching velocity whereas the friction coefficient is almost independent of the scratching velocities *** is also found that stronger indenter/polymer interaction strength results in a larger tangential force and friction coefficient.

关键词： polymer nanoscratching molecular dynamics

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Deep-learning-based nanowire detection in AFM images for automated nanomanipulation

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Nanotechnology and precision Engineering 2021年第1期4卷 7-16页

作者： Huitian Bai Sen Wu state key laboratory of precision measuring technology and instruments Tianjin UniversityTianjin 300072China

Atomic force microscope(AFM)-based nanomanipulation has been proved to be a possible method for assembling various nanoparticles into complex patterns and *** achieve efficient and fully automated nanomanipulation,nanoparticles on the substrate must be identified precisely and *** work focuses on an autodetection method for flexible nanowires using a deep learning *** instance segmentation network based on You Only Look Once version 3(YOLOv3)and a fully convolutional network(FCN)is applied to segment all movable nanowires in AFM *** with follow-up image morphology and fitting algorithms,this enables detection of postures and positions of nanowires at a high abstraction *** from these algorithms,our program is able to automatically detect nanowires of different morphologies with nanometer resolution and has over 90%reliability in the testing *** detection results are less affected by image complexity than the results of existing methods and demonstrate the good robustness of this algorithm.

关键词： Nanowire detection Instance segmentation YOLOv3 FCN Deep learning AFM

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Design of vision measurement system of double optical paths with single CCD based on DSP

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Optoelectronics Letters 2009年第6期5卷 450-453页

作者：何明霞曹伟张旭 state key laboratory of precision measuring technology and instruments Tianjin University

The design of vision measurement system of double optical paths with single CCD based on the digital signal processor(DSP) is *** TMS320F2812 as the intelligent control unit,the CCD driving circuit,level conversion circuit and CCD output signal data acquisition and processing circuit are *** means of plane reflectors,the optical structure of the system is optimized,which reduces errors owing to tilt effect of the measured unit,improves measuring accuracy and makes the system more *** optical paths signal data acquisition with single CCD is *** addition,the improved resolution is enhanced up to sub-pixel level by the average polynomial interpolation algorithm.

关键词：单CCD 测量系统双光路 DSP 设计 TMS320F2812 视觉数字信号处理器

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Measurement of borneol based on infrared spectrometry

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Chinese Optics Letters 2005年第2期3卷 116-118页

作者：谷筱玉汪曣孙惠丽徐可欣 state key laboratory of precision measuring technology and instruments Tianjin University Tianjin 300072

The infrared spectrometry contains multiple information of the sample, and it is easy to be applied to online measurement. To Chinese medicine, this technology can improve the standard of quality control and accelerate the modernization course. In this paper, we investigate the spectral characteristics of borneol, an effective ingredient in many Chinese medicines. The following results are achieved. In middle infrared （MIR） region, utilizing the linear relationship between absorption and concentration, the concentration of borneol with relative error within 4.30% in the strongest absorption region （2950-2970 cm^-1） is measured; in near infrared （NIR） region, the predicted concentrations of borneol are calculated by using partial least squares （PLS） regression analysis, in which the wavelengths are selected by genetic algorithm （GA） from the absorption bands of borneol in NIR region. The predicted relative error of calibration model is less than 2%. This result shows that PLS regression analysis combining genetic algorithm is a good method to improve prediction and reduce data in NIR region.

关键词： Calibration Genetic algorithms Least squares approximations Medicine Quality control Standards

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