document

Online Condition Monitoring Methodology for Power Electronics Package Reliability Assessment

Martin, H.A. (author), Smits, Edsger C.P. (author), Poelma, René H. (author), van Driel, W.D. (author), Zhang, Kouchi (author)

This article introduces an online condition monitoring strategy that utilizes a transient heat pulse to detect package thermal performance degradation. The metric employed is the temperature-dependent transient thermal impedance "Zth(t, Tamb)."The proposed methodology offers quantitative insights into package thermal performance degradation...

journal article 2024

document

Aging and Sintered Layer Defect Detection of Discrete MOSFETs Using Frequency Domain Reflectometry Associated With Parasitic Resistance

Yun, Minghui (author), Yang, Daoguo (author), Cai, Miao (author), Yan, Haidong (author), Yu, Jiabing (author), Liu, Mengyuan (author), He, Siliang (author), Zhang, Kouchi (author)

Metal-oxide-semiconductor field-effect transistors (MOSFETs) undergo fatigue degradation under high thermal and electrical stresses. This process results in changes in their parasitic parameters, which can be detected using frequency domain reflectometry (FDR). Frequency domain impedance analysis is employed to characterize the various...

journal article 2024

document

Biosynthesis of Copper Oxide and Silver Nanoparticles by Bacillus Spores and Evaluation of the Feasibility of Their Use in Antimicrobial Paints

Alali, Arkan (author), Hosseini-Abari, Afrouzossadat (author), Bahrami, A. (author), Yazdan Mehr, M. (author)

Modification of paint with nanoparticles (NPs) provides self-cleaning, water/dirt-repellent, and other properties. Therefore, the aim of the present study was to biosynthesize silver (Ag) and copper oxide (CuO) NPs and to prepare NP-modified paint. To this end, AgNPs and CuONPs were biosynthesized using Bacillus atrophaeus spores and commercial...

journal article 2023

document

The response of human macrophages to 3D printed titanium antibacterial implants does not affect the osteogenic differentiation of hMSCs

Garmendia Urdalleta, A. (author), van Poll, M.A. (author), Fahy, Niamh (author), Witte-Bouma, Janneke (author), van Wamel, Willem (author), Apachitei, I. (author), Zadpoor, A.A. (author), Fratila-Apachitei, E.L. (author), Farrell, Eric (author)

Macrophage responses following the implantation of orthopaedic implants are essential for successful implant integration in the body, partly through intimate crosstalk with human marrow stromal cells (hMSCs) in the process of new bone formation. Additive manufacturing (AM) and plasma electrolytic oxidation (PEO) in the presence of silver...

journal article 2023

document

Connecting the macroscopic and mesoscopic properties of sintered silver nanoparticles by crystal plasticity finite element method

Long, Xu (author), Chong, Kainan (author), Su, Yutai (author), Du, L. (author), Zhang, Kouchi (author)

The stress–strain response of sintered silver nanoparticles (AgNP) materials is precisely characterized in order to adapt for numerical analysis and rational design of electronic packaging structures in this study. A framework of crystal plasticity finite element method (CPFEM) is established based on the mechanism of crystal plastic...

journal article 2023

document

Theoretical study of silver nanoparticle suspension in electroosmosis flow through a nonuniform divergent channel with compliant walls: A therapeutic application

Irfan, Muhammad (author), Siddique, Imran (author), Nazeer, Mubbashar (author), Ali, W. (author)

This study explores the effect of silver nanoparticles on heat transfer and flow behavior within the context of the Ellis fluid model. It specifically considers electroosmotic forces in a nonuniform divergent channel with compliant walls. The analysis involves studying thermal transport in silver-blood nanofluid flow, using MATHEMATICA 13.2...

journal article 2023

document

Optical and morphological characterization of nanostructured AgO thin films

Rad, Adeleh Granmayeh (author), Abbasi, H. (author)

Silver oxide (AgO) thin films were prepared by using a cylindrical direct current reactive magnetron sputtering system at 10⁻⁵ torr initial pressure on BK7 glass substrate. Samples deposited for 3, 5 and 7 minutes. Surface characterization of AgO thin films in the nanometer scale can be accurately determined using the atomic force...

journal article 2023

document

Effect of peptide aerogel composite on silver nanoparticles as a catalyst for electrochemical CO₂ reduction

Rashid, Roomina (author), Abdinejad, M. (author), Motlagh, Mozhgan Khorasani (author), Noroozifar, Meissam (author), Kraatz, Heinz Bernhard (author)

Electrochemical reduction of carbon dioxide (CO₂RR) product distribution has been found to be dependent on several key factors, such as catalyst surface morphology, stability, and porosity. Metal-modified carbon-based materials have received a lot of attention in CO₂RR. However, designing a highly active metal carbon...

journal article 2023

document

Printing electrodes for P(VDF-TrFE-CTFE) actuators using a consumer grade inkjet printer

Baelz, K.K. (author), Hunt, A. (author)

To facilitate smart material transducer research and application, it is important to develop fabrication processes that are widely accessible and compatible with additive manufacturing (AM) techniques. This work addresses inkjet printing and material selection in the fabrication of bending cantilever actuators based on the P(VDF-TrFE-CTFE)...

conference paper 2023

document

Screen Printed Fire-Through Contact Formation for Polysilicon-Passivated Contacts and Phosphorus-Diffused Contacts

Chaudhary, A. (author), Hos, Jan (author), Lossen, Jan (author), Huster, Frank (author), Kopecek, Radovan (author), van Swaaij, R.A.C.M.M. (author), Zeman, M. (author)

In this article, we investigate the passivation quality and electrical contact properties for samples with a 150 nm thick n+ polysilicon layer in comparison to samples with a phosphorus diffused layer. High level of passivation is achieved for the samples with n+ polysilicon layer and an interfacial oxide underneath it. The contact properties...

journal article 2022

document

Preventing Antibiotic-Resistant Infections: Additively Manufactured Porous Ti6Al4V Biofunctionalized with Ag and Fe Nanoparticles

Putra, N.E. (author), Leeflang, M.A. (author), Ducret, Verena (author), Patrulea, Viorica (author), Fratila-Apachitei, E.L. (author), Perron, Karl (author), Ye, Hua (author), Zhou, J. (author), Apachitei, I. (author), Zadpoor, A.A. (author)

Implant-associated infections are highly challenging to treat, particularly with the emergence of multidrug-resistant microbials. Effective preventive action is desired to be at the implant site. Surface biofunctionalization of implants through Ag-doping has demonstrated potent antibacterial results. However, it may adversely affect bone...

journal article 2022

document

CO₂ Electrolysis via Surface-Engineering Electrografted Pyridines on Silver Catalysts

Abdinejad, M. (author), Irtem, I.E. (author), Farzi, Amirhossein (author), Sassenburg, M. (author), Subramanian, S.S. (author), Iglesias van Montfort, H.P. (author), Ripepi, D. (author), Li, Mengran (author), Middelkoop, J. (author), Seifitokaldani, Ali (author), Burdyny, T.E. (author)

The electrochemical reduction of carbon dioxide (CO₂) to value-added materials has received considerable attention. Both bulk transition-metal catalysts and molecular catalysts affixed to conductive noncatalytic solid supports represent a promising approach toward the electroreduction of CO₂. Here, we report a combined...

journal article 2022

document

Contribution of extracellular polymeric substances fractions to the adsorption of silver nanoparticles by activated sludge

Xu, Yanghui (author), Ou, Qin (author), He, Qiang (author), Wu, Zhengsong (author), Ma, Jun (author), Huangfu, Xiaoliu (author)

The extracellular polymeric substances (EPS) from activated sludge played significant roles in the removal of nanoparticles from wastewater. A series of batch experiments were carried out to determine the adsorption mechanism of three nano-Ag by activated sludge, as well as the contributions of EPS fractions including dissolved EPS (DEPS),...

journal article 2022

document

Tensile characterization and constitutive modeling of sintered nano-silver particles over a range of strain rates and temperatures

Qian, Cheng (author), Gu, Tijian (author), Wang, Ping (author), Cai, Wei (author), Fan, Xuejun (author), Zhang, Kouchi (author), Fan, J. (author)

Sintered nano-silver die-attach materials have been widely used in high-power electronics packaging because of their high thermal and electrical conductivities. In this study, we characterized the tensile properties of sintered nano-silver particles over a range of strain rates and temperatures, and established the constitutive models. First, 50...

journal article 2022

document

Urea-Functionalized Silver Catalyst toward Efficient and Robust CO₂ Electrolysis with Relieved Reliance on Alkali Cations

Garg, Sahil (author), Li, Mengran (author), Hussain, Tanveer (author), Idros, Mohamed Nazmi (author), Wu, Yuming (author), Zhao, Xiu Song (author), Wang, Geoff G.X. (author), Rufford, Thomas E. (author)

We report a new strategy to improve the reactivity and durability of a membrane electrode assembly (MEA)-type electrolyzer for CO2 electrolysis to CO by modifying the silver catalyst layer with urea. Our experimental and theoretical results show that mixing urea with the silver catalyst can promote electrochemical CO2 reduction (CO2R),...

journal article 2022

document

Fighting Antibiotic-Resistant Bacterial Infections by Surface Biofunctionalization of 3D-Printed Porous Titanium Implants with Reduced Graphene Oxide and Silver Nanoparticles

San, H. (author), Paresoglou, M. (author), Minneboo, M.B. (author), van Hengel, I.A.J. (author), Yilmaz, A. (author), Gonzalez Garcia, Y. (author), Fluit, Ad C. (author), Hagedoorn, P.L. (author), Fratila-Apachitei, E.L. (author), Apachitei, I. (author), Zadpoor, A.A. (author)

Nanoparticles (NPs) have high multifunctional potential to simultaneously enhance implant osseointegration and prevent infections caused by antibiotic-resistant bacteria. Here, we present the first report on using plasma electrolytic oxidation (PEO) to incorporate different combinations of reduced graphene oxide (rGO) and silver (Ag) NPs on...

journal article 2022

document

Joint Analysis and Reliability Test of Epoxy-Based Nano Silver Paste Under Different Pressure-Less Sintering Processes

Wang, Xinyue (author), Zeng, Zejun (author), Zhang, Kouchi (author), Zhang, Jing (author), Liu, Pan (author)

Recent years, the sintered silver paste was introduced and further developed for power electronics packaging due to low processing temperature and high working temperature. The pressure-less sintering technology reduces the stress damage caused by the pressure to the chip, improves reliability, and is widely applied in manufacturing....

journal article 2022

document

Thermal Stable High-Efficiency Copper Screen Printed Back Contact Solar Cells

Chen, N. (author), Rudolph, Dominik (author), Peter, Christoph (author), Zeman, M. (author), Isabella, O. (author), Rosen, Yitzchak (author), Grouchko, Michael (author), Shochet, Ofer (author), Mihailetchi, Valentin D. (author)

The high usage of silver in industrial solar cells may limit the growth of the solar industry. One solution is to replace Ag with copper. A screen printable Cu paste is used herein to metallize industrial interdigitated back contact (IBC) solar cells. A novel metallization structure is proposed for making solar cells. Cu paste is applied to...

journal article 2022

document

Characterizing CO2 Reduction Catalysts on Gas Diffusion Electrodes: Comparing Activity, Selectivity, and Stability of Transition Metal Catalysts

Burdyny, T.E. (author), Sassenburg, M. (author), de Rooij, R. (author), Nessbit, Nathan (author), Kas, R. (author), Chandrashekar, S. (author), Firet, N.J. (author), Yang, K. (author), Liu, K. (author), Blommaert, M.A. (author), Kolen, M. (author), Ripepi, D. (author), Smith, W.A. (author)

Continued advancements in the electrochemical reduction of CO 2 (CO 2RR) have emphasized that reactivity,selectivity, and stability are not explicit material properties butcombined effects of the catalyst, double-layer, reaction environ-<br/>ment, and system configuration. These realizations have steadily built upon the foundational work...

journal article 2022

document

Assessing Silver Palladium Alloys for Electrochemical CO₂ Reduction in Membrane Electrode Assemblies

Chandrashekar, S. (author), Geerlings, J.J.C. (author), Smith, W.A. (author)

The field of electrochemical CO₂ reduction has been transitioning to industrially relevant scales by changing the architecture of the electrochemical cells and moving away from the traditional aqueous H-cells to membrane electrode assemblies (MEA). The reaction environments in MEAs vary drastically from that of aqueous H-cells,...

journal article 2021