Frank Clemens

Enhancing the ferroelectric properties of (K,Na)NbO3 piezoceramic macrofi-bers through (K,Na)NbO3 needle templates

Arun Ichangi, Cenk Abdurrahmanoglu, Xavier Maeder, Astri Bjørnetun Haugen et autres

Ceramic fibers, owing to their high surface-to-volume ratio and strong anisotropy, are of great interest to the scientific community. For piezoceramic fibers, inducing crystallographic texture is an effective way to enhance their properties. In this work, macrofibers of potassium sodium niobate (KNN) …

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Dynamic Ionic Crosslinking of Epoxidized Natural Rubber for Rebonding and Reprocessable Carbon Black–Reinforced SBR/BR Composites

Piyawadee Luangchuang, Yeiangchart Boonluksiri, Jobish Johns, Wisut Kaewsakul et autres

ABSTRACT This study presents a dynamic ionic crosslinking strategy for developing self‐healing and reprocessable elastomeric composites based on epoxidized natural rubber (ENR) containing 50 mol% epoxide which was chemically modified with imidazole (IM) to generate reversible ionic interactions and used as a …

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Fully Aqueous Electrospinning of Binary PVP/Sodium-Alginate and PVP/Riboflavin Nanofibres: Additive Effects and UV-Assisted Processing

J Dirceu de Andrade, Gilmar P. Thim, Fernando Cabral, Frank Clemens et autres

Electrospinning (ES) can produce nonwoven fibrous mats with high surface area and interconnected porosity, making them attractive for biomedical and functional material applications. However, conventional ES often relies on volatile organic solvents, raising safety, environmental, and translational concerns. Fully aqueous (“green”) ES …

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Near-percolative carbon black–barium titanate hybrid networks in epoxidized natural rubber for tunable dielectric and piezoelectric signal

Lyhav Boeurn, Sasitorn Srisawadi, Teeranoot Chanthasopeephan, Vichet Suong et autres

Flexible composites with high dielectric constants have been developed for advanced electronic and functional applications. In this study, epoxidized natural rubber (ENR-25) based composites containing hybrid conductive carbon black (CCB) and barium titanate (BT) fillers were developed to achieve balanced thermo-electro-mechanical properties. …

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Enhancing piezoresistive sensitivity of natural rubber composites filled with conductive carbon black: A comparative study of grafted vs ungrafted forms

Arthittaya Chuaybamrung, Rawiporn Promsung, Frank Clemens, Yeampon Nakaramontri et autres

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Self-healing thermoplastic elastomer blends with hybrid fillers for piezoresistive and humidity sensing applications

Antonia Georgopoulou, Louisa Marie Eckey, Markus Susoff, Frank Clemens

Sustainable, flexible electronics are promising for soft robotics, wearable devices, and e-skin, but soft substrates and sensors are vulnerable to damage. Incorporating self-healing functionality provides a promising strategy to overcome this limitation, enhancing durability and extending the operational lifetime. In this study, …

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Thermoplastic material extrusion additive manufacturing with in-situ milling: A novel approach for shaping of ceramics

Paul Justen, Elham Montakhab, Noël Thomas, Frank Clemens

A notable disadvantage of thermoplastic material extrusion additive manufacturing is the prevalence of printing defects within the structures. This phenomenon results in a reduction in the mechanical strength of the structures in comparison to pressed parts. In this study, we evaluated the …

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Electromechanical response of Hyperelastic-Piezoelectric composites using Direct FE2 multiscale modeling

Akanae Chattrairat, Yeampon Nakaramontri, Juthanee Phromjan, Frank Clemens et autres

Piezoelectric soft materials generating electrical signals in response to mechanical deformation have been of great interest over the past decade, owing to their potential applications in human activity sensing and energy harvesting. In this study, a multiscale Direct FE 2 method is …

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Development of the Experimental Setup for Testing Magneto-Deformation Properties of Magnetoactive Materials

Paweł Orkisz, Bogdan Sapiński, Somashree Mondal, Frank Clemens

The paper deals with an experimental setup that is designed to help test magnetoactive materials with regard to the control of deformation connected with magnetic and thermal stimuli. The architecture of the setup is divided into direct and supervisory control layers, in …

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Piezoresistive Natural Rubber Composites: A Comparison Between Low‐Temperature Glutaraldehyde Curing Agents and Conventional Sulfur Curing Systems

Rawiporn Promsung, Arthittaya Chuaybamrung, Antonia Georgopoulou, Yeampon Nakaramontri et autres

ABSTRACT This study examines the piezoresistive behavior of natural rubber (NR) composites cured with sulfur (S) and glutaraldehyde (GA) and reinforced with a hybrid conductive system of conductive carbon black (CCB) and carbon nanotubes (CNT). GA‐cured NR composites demonstrated superior mechano‐electrical performance, …

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Effect of thermoplastic polyurethane filament on the cellular ceramics structures obtained from material extrusion and polymer-derived ceramic

Apoorv Kulkarni, Louisa Marie Eckey, Pietro Mosca, Rajat Chaudhary et autres

Cellular ceramic structures were fabricated via 3D printing of thermoplastic polyurethane (TPU) followed by impregnation with polysilazane, and pyrolysis. The 3D printing was performed using fused filament fabrication (FFF), while the ceramic was obtained through the polymer derived ceramic (PDC) process starting …

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Influence of grafted natural rubber on electrical, mechanical and thermo–mechanical properties of natural rubber/carbon nanotubes nanocomposites using glutaraldehyde as a curing agent

Arthittaya Chuaybamrung, Rawiporn Promsung, Frank Clemens, Yeampon Nakaramontri et autres

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