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Ferroelectric catalytic BaTiO_(3)-based composite insoles to promote healing of infected wounds:Analysis of antibacterial efficacy and angiogenesis

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Interdisciplinary Materials 2024年第5期3卷 757-774页

作者： Qiong Liu Xudan Liu Linfeng Fan Xinna Bai Hao Pan Hang Luo dou Zhang Haitao Huang Chris R.Bowen State Key Laboratory of Powder Metallurgy Central South UniversityChangshaHunanChina Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongChina Department of Periodontics Hunan Key Laboratory of Oral Health Research&Hunan 3D Printing Engineering Research Center of Oral Care&Hunan Clinical Research Center of Oral Major Diseases and Oral Health&Xiangya Stomatological Hospital&Xiangya School of StomatologyCentral South UniversityChangshaHunanChina Department of Mechanical Engineering University of BathBathUK

Our feet are often subjected to moist and warm environments,which can promote the growth of harmful bacteria and the development of severe infection in wounds located in the *** a result,there is a need for new and innovative strategies to safely sterilize feet,when shoes are worn,to prevent any potential foot-related *** this paper,we have produced a non-destructive,biocompatible and convenient-to-use insole by embedding a BaTiO_(3)(BT)ferroel ectric material into a conventional polydimethylsilane(PdMS)insole material to exploit a ferroelectric catalytic effect to promote the antibacterial and healing of infected wounds via the ferroelectric charges generated during *** formation of reactive oxygen species generated through a ferroelectric catalytic effect in the PdMS-BT composite is shown to increase the oxidative stress on bacteria and decrease both the activity of bacteria and the rate of formation of bacterial *** addition,the ferroelectric field generated by the PdMS-BT insole can enhance the level of transforming growth factor-beta and Cd31 by influencing the endogenous electric field of a wound,thereby promoting the proliferation,differentiation of fibroblasts and *** work therefore provides a new route for antimicrobial and tissue reconstruction by integrating a ferroelectric biomaterial into a shoe insole,with significant potential for health-related applications.

关键词： ferroelectric filed effect PdMS-BaTiO3 insole piezo-catalysis wound healing

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A Polyvinyl Alcohol/Acrylamide Hydrogel with Enhanced Mechanical Properties Promotes Full-Thickness Skin defect Healing by Regulating Immunomodulation and Angiogenesis Through Paracrine Secretion

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engineering 2024年第6期37卷 138-151页

作者： Peng Wang Liping Qian Huixin Liang Jianhao Huang Jing Jin Chunmei Xie Bin Xue Jiancheng Lai Yibo Zhang Lifeng Jiang Lan Li Qing Jiang State Key Laboratory of Pharmaceutical Biotechnology Division of Sports Medicine and Adult Reconstructive SurgeryDepartment of Orthopedic SurgeryNanjing Drum Tower HospitalThe Affiliated Hospital of Nanjing University Medical SchoolNanjing UniversityNanjing 210008China Jiangsu Engineering Research Center for 3D Bioprinting Nanjing 210008China Institute of Medical 3D Printing Nanjing UniversityNanjing 210093China Centre for Experimental Animals Nanjing Drum Tower HospitalThe Affiliated Hospital of Nanjing University Medical SchoolNanjing UniversityNanjing 210008China College of Aeroplane Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China National Laboratory of Solid State Microstructures Department of PhysicsNanjing UniversityNanjing 210093China Department of Chemical Engineering Stanford UniversityStanfordCA 94305USA Department of Orthopedic Surgery The Second Affiliated Hospital Zhejiang University School of MedicineOrthopedic Research Institute of Zhejiang UniversityKey Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang ProvinceHangzhou 310009China

Hydrogel-based tissue-engineered skin has attracted increased attention due to its potential to restore the structural integrity and functionality of ***,the mechanical properties of hydrogel scaffolds and natural skin are substantially ***,we developed a polyvinyl alcohol(PVA)/acrylamide based interpenetrating network(IPN)hydrogel that was surface modified with polydopamine(PdA)and termed *** dopa-gel exhibited mechanical properties similar to native skin tissue and a superior ability to modulate paracrine ***,a tough scaffold with tensile resistance was fabricated using this hydrogel by three-dimensional *** results showed that the interpenetration of PVA,alginate,and polyacrylamide networks notably enhanced the mechanical properties of the *** modification with PdA endowed the hydrogels with increased secretion of immunomodulatory and proangiogenic *** an in vivo model,dopa-gel treatment accelerated wound closure,increased vascularization,and promoted a shift in macrophages from a proinflammatory M1 phenotype to a prohealing and anti-inflammatory M2 phenotype within the wound ***,the focal adhesion kinase(FAK)/extracellular signal-related kinase(ERK)signaling pathway may mediate the promotion of skin defect healing by increasing paracrine secretion via the ***,proangiogenic factors can be induced through Rho-associated kinase-2(ROCK-2)/vascular endothelial growth factor(VEGF)-mediated paracrine secretion under tensile stress *** together,these findings suggest that the multifunctional dopa-gel,which has good mechanical properties similar to those of native skin tissue and enhanced immunomodulatory and angiogenic properties,is a promising scaffold for skin tissue regeneration.

关键词： Polyvinyl alcohol/acrylamide hydrogel Mechanical property enhancement Paracrine effect Skin regeneration Signaling pathways

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A Phase Transition Model for Acid dissolution Along a Rough-Walled Carbonate Fracture

SSRN

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SSRN 2023年

作者： Chen, Yun Mao, Haiyang Ma, Guowei School of Civil and Transportation Engineering Hebei University of Technology Tianjin300401 China Engineering Research Center on Construction 3D Printing of Hebei Tianjin300401 China

Carbonate reservoirs commonly feature rough-walled fractures with complex geometries and hydraulic properties, posing significant challenges in accurately evaluating the dissolution patterns and conductivities along these fractures during acid stimulation processes in oil, gas, and geothermal production. This study conducts an experimental investigation of acid treatment in carbonate fractures with varying roughness levels to analyze the transition patterns in the dissolution of these rough-walled fractures, particularly focusing on the effects of acid injection rate and fracture roughness. The results reveal that the dissolution patterns progressively change from uniform dissolution and channel dissolution to surface dissolution. This transition occurs either with an increase in the acid injection rate or a decrease in the fracture roughness. In response to these findings, a phase transition model has been developed to incorporate the dissolution pattern transition, taking into consideration the roughness of the fractures. The model is based on the degree of dissolution observed in the etching channels in the flow and longitudinal direction. Further analysis of fracture conductivities, considering different dissolution patterns, indicates that the formation of etching channels post-acidizing in these rough-walled fractures is the primary factor influencing changes in the conductivity of the fracture surfaces. A channel-dissolution coefficient [[EQUATION]] is introduced for the evaluation of the dissolution pattern and fracture conductivity. The critical transition value from uniform to channel dissolution is identified as [[EQUATION]] ([[EQUATION]] = 1.7 × 10-5), and the transition from channel dissolution to surface dissolution is [[EQUATION]] ([[EQUATION]] = 2.65 × 10-5). Analysis comparing fracture conductivities under different dissolution patterns reveals a preference for channel dissolution, which offers enhanced efficiency in acid treatment. For optimal trea

关键词： dissolution

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A Generalized Polymer Precursor Ink design for 3d printing of Functional Metal Oxides

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Nano-Micro Letters 2023年第10期15卷 433-448页

作者： Hehao Chen Jizhe Wang Siying Peng dongna Liu Wei Yan Xinggang Shang Boyu Zhang Yuan Yao Yue Hui Nanjia Zhou Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering and Research Center for Industries of the FutureWestlake UniversityHangzhou 310030People’s Republic of China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024People’s Republic of China School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027People’s Republic of China School of Chemical Engineering and Advanced Materials the University of AdelaideAdelaide 5005Australia

Three-dimensional-structured metal oxides have myriad applications for optoelectronic *** to conventional lithography-based manufacturing methods which face significant challenges for 3d device architectures,additive manufacturing approaches such as direct ink writing offer convenient,on-demand manufacturing of 3d oxides with high resolutions down to sub-micrometer ***,the lack of a universal ink design strategy greatly limits the choices of printable ***,a universal,facile synthetic strategy is developed for direct ink writable polymer precursor inks based on metal-polymer coordination ***,polyethyleneimine functionalized by ethylenediaminetetraacetic acid is employed as the polymer matrix for adsorbing targeted metal ***,glucose is introduced as a crosslinker for endowing the polymer precursor inks with a thermosetting property required for 3d printing via the Maillard *** demonstrations,binary(i.e.,ZnO,CuO,In_(2)O_(3),Ga_(2)O_(3),TiO_(2),and Y_(2)O_(3)) and ternary metal oxides(i.e.,BaTiO_(3) and SrTiO_(3)) are printed into 3d architectures with sub-micrometer resolution by extruding the inks through ultrafine *** thermal crosslinking and pyrolysis,the 3d microarchitectures with woodpile geometries exhibit strong light-matter coupling in the mid-infrared *** design strategy for printable inks opens a new pathway toward 3d-printed optoelectronic devices based on functional oxides.

关键词： 3d printing Maillard reaction Polymer-assisted deposition Metal oxide Photonic crystal

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Prediction and Analysis of Post-Treatment of Sustainable Walnut Shell/Co-PES Parts by Laser Sintering

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Journal of Renewable Materials 2021年第2期9卷 351-364页

作者： Yueqiang Yu Suling Wang Minzheng Jiang Yanling Guo Ting Jiang Northeast Petroleum University College of Mechanical Science and EngineeringDaqing163318China Northeast Forestry University College of Mechanical and Electrical EngineeringHarbin150040China Northeast Forestry University Research and Development Center of 3D Printing Material and TechnologyHarbin150040China

In order to enhance the strength of sustainable walnut shell/Co-PES(WSPC)sintered parts,wax-filtrated posttreatment was carried *** effects of treating fluid temperature,preheating time and immersion time on the bending strength of WSPC wax-filtrated parts were analyzed by single factor analysis *** obtain an accurate model for predicting the bending strength of the WSPC wax-filtrated part,the experiments were involved by using Box-Behnken design(BBd).Main parameters,such as treating fluid temperature,preheating time and immersion time,and their interactive effects were analyzed through analysis of variance(ANOVA)and graphical *** results demonstrated that all parameters’direct effects were significant to bending strength of the WSPC wax-filtrated *** optimum value was 5.0 MPa when the treating fluid temperature of 70°C,preheating time of 50 min,and immersion time of 20 *** predicted models effectively validated had good predicting *** WSPC wax-filtrated part using optimal processing parameters was processed by investment casting,and then the metal casting of dimensional stability and smooth surface was *** casting was done using WSPC wax-filtrated parts under optimal process parameters and then metal parts with stable structure size and smooth surface can be obtained,which indicates that WSPC material can be used for investment casting.

关键词： Agricultural and forestry wastes three-dimensional printing selective laser sintering post processing response surface methodology

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Evaluation of Parylene-HT as dielectric for Application in Advanced Package Substrates

Evaluation of Parylene-HT as Dielectric for Application in A...

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Electronic Components and technology Conference (ECTC)

作者： Pratik Nimbalkar Mercy Aguebor Mohanalingam Kathaperumal Madhavan Swaminathan Rao Tummala 3D Systems Packaging Research Center Georgia Institute of Technology Atlanta USA Dept. of Electrical Engineering 3D Systems Packaging Research Center Pennsylvania State University

Polymer dielectrics having low dielectric constants are necessary for next-generation package substrates to achieve lower losses and higher bandwidth densities. Conventional silica-filled dielectrics have higher dielectric constants due to the silica fillers. Therefore, it is important to explore novel dielectric materials for next-generation package substrates that have lower dielectric constants. Parylenes have a unique set of properties such as- very low moisture absorption, low gas permeability, conformal deposition, and heat resistance. Some parylenes also have a very low dielectric constant, low dielectric dissipation losses and low roughness that make them attractive as dielectrics for application in advanced package substrates. Amongst all parylenes, Parylene-Hthas the lowest dielectric constant $(\mathrm{d}_{k})$ of 2.17 and dissipation factor $(\mathbf{d}_{f})$ of 0.001 at 1 MHz, thus making it attractive for high-frequency applications. However, there are several challenges associated with the use of polymer dielectrics in package substrates such as- adhesion to Cu, via formation ability, processability, mechanical reliability and electrical reliability. This paper evaluates Parylene- Htwith respect to all these challenges.

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Maskless Lithography for High-density Package Redistribution Layers

Maskless Lithography for High-Density Package Redistribution...

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Electronic Components and technology Conference (ECTC)

作者： Prahalad Murali Pratik Nimbalkar Mohanalingam Kathaperumal Mark d. Losego Rao Tummala Madhavan Swaminathan 3D Systems Packaging Research Center Georgia Institute of Technology Atlanta USA 3D Systems Packaging Research Center & Dept. of Electrical Engineering Pennsylvania State University

Heterogeneous integration of chiplets requires high-density fine line/space (L/S) interconnections to enable system scaling. However, as Moore's law for transistors slows down, the dies are disaggregated based on their specific functions thereby increasing the package sizes to accommodate various dies of different functionalities. To enable a high-density redistribution layer (RdL) in the package, this paper studies the fine-line patterning capability of maskless aligner systems. The paper evaluates the smallest achievable feature size on four different thicknesses namely 5 $\mu \mathrm{m}, 7 \mu \mathrm{m}, 25 \mu \mathrm{m}$ and 80 $\mu \mathrm{m}$ of dry film photoresists (PRs). This work also investigates the effect of dose and defocus on photoresists. Two of the photoresists (5 μm and 80 $\mu \mathrm{m})$ are positive tone and the other 2 are negative tone. The finest L/S obtained was 1.5μm with the positive tone 5 $\mu \mathrm{m}$ dry film photoresist, 3 $\mu \mathrm{m}$ using the 7 $\mu \mathrm{m}$ negative tone and 20 μm using the 80 μm positive tone resist. This paper also investigates the throughput of the maskless aligners based on the dose, exposure area, and pattern density.

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Assembly of 3d-printed Ti scaffold and free vascularized fibula using a customized Ti plate for the reconstruction of mandibular defects

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Bio-design and Manufacturing 2022年第2期5卷 424-429页

作者： Chiyang Zhong Yixuan Zhao Hongyu Xing Qingguo Lai Runqi Xue Tianxiang Song Xiaopeng Tang Kaiwen Zhu Yanwei deng Department of Oral and Maxillofacial Surgery The Second HospitalCheeloo College of MedicineShandong UniversityJinan 250033China School of Stomatology Cheeloo College of MedicineShandong UniversityJinan 250012China School of Mechanical and Electronic Engineering Shandong Jianzhu UniversityJinan 250101China Research Center of 3D Printing in Stomatology of Shandong University Jinan 250012China

Introduction Mandibular segmental defects result in significant cosmetic and functional ***,the reconstruction of both the contour and function of the mandible is a challenging *** present,autologous vascularized fibu... 详细信息

关键词： fibula mandibular defects

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Construction of Equipment dataset and Model design for SLA-based 3d printing Process Optimization

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Transactions of the Korean Institute of Electrical Engineers 2024年第4期73卷 738-743页

作者： Lim, Tae-Hoon Shin, Hwa-Seon Ha, Cheol-Woo Lee, Hye-In Intelligence Integrated SW Research Center Korea Electronics Technology Institute Korea Republic of 3D Printing Manufacturing Innovation Center Korea Institute of Industrial Technology Korea Republic of Intelligence Integrated SW Research Center Korea Electronics Tech Korea Korea Republic of

This paper describes training data construction and analysis for developing a process-optimized artificial intelligence model to minimize errors occurring during the SLA-based additive manufacturing process. The photocurable resin molding method is a way in which UV lasers are irradiated into a tank containing liquid resin, solidified and stacked layer by layer, and like other additive manufacturing methods, there is an error in output deformation. However, due to the opaque resin, it is more difficult to check the error pattern than other method printer. In this study, to detect these error patterns, collecting data system in the actual process was established for sensor data, image data, and thermal image data and a study on data analysis was conducted. Copyright © The Korean Institute of Electrical Engineers.

关键词： 3d printing

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Analysis of variable frictional contacts wave springs fabricated using MultiJet fusion additive manufacturing

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International Journal of Advanced Manufacturing technology 2023年第1-2期126卷 87-101页

作者： Shah, Gul Jamil Haq, Muhammad Rizwan ul Lin, Shang-Chih Jeng, Jeng-Ywan Department of Mechanical Engineering National Taiwan University of Science and Technology No. 43 Section 4 Keelung Road Taipei106 Taiwan High-Speed 3D Printing Research Center National Taiwan University of Science and Technology No. 43 Section 4 Keelung Road Taipei 106 Taipei Taiwan Islamabad Pakistan Graduate Institute of Biomedical Engineering National Taiwan University of Science and Technology Taipei Taiwan Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan Taiwan

Additive manufacturing (AM), often known as 3d printing, is a fast-growing fabrication technology that is rapidly displacing traditional manufacturing due to its capacity to manufacture complex geometries with ease of customization, such as in the case of wave spring designs. Such springs have prospective uses in a variety of industries, including aerospace, automotive, oil and gas, and biomedical where researchers/engineers are interested in the mechanical properties of such springs. Slippage of coils is one of the significant phenomena that was noted during axial compression of additively manufactured wave springs. This study aims to investigate the effect of variable frictional contacts between the coils of wave spring on energy absorption, stiffness, load-bearing capacity, and compression behavior during loading- unloading. Nine contact wave springs with different profiles, i.e., sine, square, concave, convex, V, and mixed profiles on the surface of coils, were designed and fabricated using HP MultiJet fusion printer. Compression testing was performed up to ten cycles to analyze the mechanical performance and compression behavior of each design. The sine profiled coils showed the highest energy absorption, with the minimum energy loss from the first to the tenth cycle while having the lowest stiffness among all the designs for this study. Furthermore, the results demonstrated that these variable fictional contacts improved the stability of the designs as the coil’s slippage resistance increased and has a significant impact on mechanical properties, allowing the researchers to design wave springs for different applications based on load/stiffness requirements having variable dimensions. Experimental results were compared with finite element analysis (FEA), which was performed using the identical boundary conditions of experimental testing and showed minimum variation in terms of load-bearing capacity and compression behavior. © 2023, The Author(s), under exclusiv

关键词： 3d printing

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