Shayan Seyedin

Newcastle University | NCL · School of Engineering

It is a challenge to retain the high stretchability of an elastomer when used in polymer composites. Likewise, the high conductivity of organic conductors is typically compromised when used as filler in composite systems. Here, it is possible to achieve elastomeric fiber composites with high electrical conductivity at relatively low loading of the...

A simple fiber spinning method used to fabricate elastomeric composite fibers with outstanding mechanical performance is demonstrated. By taking advantage of the large size of as-prepared graphene oxide sheets (in the order of tens of micrometers) and their liquid crystalline behavior, elastomeric composite fibers with outstanding low strain proper...

A new member of the 2D family called “MXene” offers metallic conductivity and outstanding electrochemical properties that are important for developing fiber supercapacitors. To date, however, scalable approaches of making MXene-based fibres are relativey unexplored. Here we demonstrate that graphene oxide liquid crystal-assisted fiber spinning appr...

The integration of nanomaterials with high conductivity into stretchable polymer fibers can achieve novel functionalities such as sensing physical deformations. With a metallic conductivity that exceeds other solution‐processed nanomaterials, 2D titanium carbide MXene is an attractive material to produce conducting and stretchable fibers. Here, a s...

The recent surge in using wearable personalized devices has made it increasingly important to have flexible textile-based sensor alternatives that can be comfortably worn and can sense a wide range of body strains. Typically fabricated from rigid materials such as metals or semiconductors, conventional strain sensors can only withstand small strain...

The scalable production of two-dimensional (2D) materials is needed to accelerate their adoption to industry. In this work, we present a low-cost in-line and enclosed process of exfoliation based on high-shear mixing to create aqueous dispersions of few-layer graphene, on a large scale with a Y w ~ 100% yield by weight and throughput of ϕ ~ 8.3 g h...

The rapid evolution of portable and wearable electronic devices has fueled the development of smart functional textiles that are able to conduct electricity, sense body movements, or store energy. One main challenge inhibiting the further development of functional textile-based electronics is the lack of robust functional fibers with suitable elect...

Rapid antigen tests are currently used for population screening of COVID-19. However, they lack sensitivity and utilize antibodies as receptors, which can only function in narrow temperature and pH ranges. Consequently, molecularly imprinted polymer nanoparticles (nanoMIPs) are synthetized with a fast (2 h) and scalable process using merely a tiny...

The quest for a close human interaction with electronic devices for healthcare, safety, energy and security has driven giant leaps in portable and wearable technologies in recent years. Electronic textiles (e-textiles) are emerging as key enablers of wearable devices. Unlike conventional heavy, rigid, and hard-to-wear gadgets, e-textiles can lead t...

Materials that are low cost and lightweight are essential for future automotive and aerospace industries. While carbon fibers have been shown to achieve high mechanical properties for high-end applications, their high cost has generated interest to find cost-effective alternatives. The recent advances in recycling carbon fibers has created an oppor...

Research on lightweight products for transportation industry, to address fuel efficiency and lower carbon footprint, has attracted great attention due to public environmental awareness. Polymer composites containing carbon fiber are boosted by automotive original equipment manufacturers (OEMs) as a replacement for steel. However, their high cost ha...

Downsizing metal-organic framework (MOF) crystals into the nanoregime offers a promising approach to further benefit from their inherent versatile pore structures and surface reactivity. In this article, downsizing is referred to as the deliberate production of typical large MOF crystals into their nanosized versions. Here, we discuss various strat...

Free‐standing films that display high strength and high electrical conductivity are critical for flexible electronics, such as electromagnetic interference (EMI) shielding coatings and current collectors for batteries and supercapacitors. 2D Ti3C2Tx flakes are ideal candidates for making conductive films due to their high strength and metallic cond...

In article number 2001093, Joselito M. Razal and co‐workers demonstrate that ordered domains of additive‐free Ti3C2Tx MXene liquid crystals can be processed into micrometer‐thin films that do not compromise mechanical properties for electrical conductivity, enabling the development of high‐performance devices and new applications.

Electroactive yarns that are stretchable are desired for many electronic textile applications, including energy storage, soft robotics, and sensing. However, using current methods to produce these yarns, achieving high loadings of electroactive materials and simultaneously demonstrating stretchability is a critical challenge. Here, a one‐step bath...

The discovery of liquid crystalline (LC) phases in dispersions of two-dimensional (2D) materials has enabled the development of macroscopically aligned three-dimensional (3D) macrostructures. Here, we report the first experimental observation of self-assembled LC phases in aqueous Ti3C2T x MXene inks without using LC additives, binders, or stabili...

Textile‐based electronics enable the next generation of wearable devices, which have the potential to transform the architecture of consumer electronics. Highly conductive yarns that can be manufactured using industrial‐scale processing and be washed like everyday yarns are needed to fulfill the promise and rapid growth of the smart textile industr...

2D transition metal carbides and nitrides called "MXene" are recent exciting additions to the 2D nanomaterials family. The high electrical conductivity, specific capacitance, and hydrophilic nature of MXenes rival many other 2D nanosheets and have made MXenes excellent candidates for diverse applications including energy storage, electromagnetic sh...

Highly conductive, strong and flexible fibers are important for the realization of many high technological applications including smart textiles, flexible electrodes, and fast-response sensors and actuators. Here, we report a facile one-step method to produce highly conducting poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) fi...

In article number 1804732, Shayan Seyedin, Joselito M. Razal, and co‐workers make a class of flexible and highly conductive fibers from MXene and PEDOT:PSS that when fabricated into elastic energy storing devices demonstrate high performance even when stretched multiple times. This work provides a promising energy storage solution for powering mini...

Recent advances in 3D printing have enabled the fabrication of interesting structures which were not achievable using traditional fabrication approaches. 3D printing of carbon microtube composite inks allows fabrication of conductive structures for practical applications in soft robotics and tissue engineering. However, it is challenging to achieve...

Fiber‐shaped supercapacitors (FSCs) are promising energy storage solutions for powering miniaturized or wearable electronics. However, the scalable fabrication of fiber electrodes with high electrical conductivity and excellent energy storage performance for use in FSCs remains a challenge. Here, an easily scalable one‐step wet‐spinning approach is...

In article number 1802225, Joselito M. Razal and co‐workers fabricate MXene‐based yarn‐shaped supercapacitors via biscrolling, which show ultrahigh MXene loading, excellent flexibility, and superior energy storage performance. The biscrolled MXene yarns with outstanding specific capacitance and energy density can potentially provide the energy solu...

Yarn‐shaped supercapacitors (YSCs) once integrated into fabrics provide promising energy storage solutions to the increasing demand of wearable and portable electronics. In such device format, however, it is a challenge to achieve outstanding electrochemical performance without compromising flexibility. Here, MXene‐based YSCs that exhibit both flex...

Tremendous progress on the next‐generation wearable electronics has promoted the research on flexible energy storage devices. As one of the promising energy storage devices, supercapacitors (SCs) have attract great interest due to the excellent electrochemical properties (i.e. high energy and power density, fast charge‐discharge and long cycle life...

Extrusion printing of interdigitated electrodes for flexible microsupercapacitors (fMSCs) offers an attractive route to the fabrication of flexible devices where cost, scalability, and processability of ink formulations are critical. In this work, highly concentrated, viscous, and water‐dispersible inks are developed based on graphene oxide (GO)/po...

A water‐based hybrid Ink comprised of GO/PANi hierarchical structure is facilely prepared with the stabilizer of PEDOT:PSS by Gordon G. Wallace, Jun Chen, and co‐workers in article number 1706592. This kind of formulated Ink is suitable for extrusion printing to directly fabricate both symmetric and asymmetric microsupercapacitors. The devices cann...

TiO2 nanoparticles have widely been used as a photocatalyst to eliminate organic contaminants from wastewater. However, the lack of selectivity is considered as one of the main drawbacks of TiO2 nanoparticles in wastewater treatment applications. To overcome this problem, this study aims at developing highly adsorbent photocatalysts with tunable se...

This data article contains analyzed data for the article “Continuous Production of Stretchable Conductive Multifilaments in Kilometer Scale Enables Facile Knitting of Wearable Strain Sensing Textiles” (Seyedin et al., 2018) [1]. Details of wet-spinning conditions to achieve scaled-up production of stretchable and conducting polyurethane/poly(3,4-et...

A facile large scale production of conductive and elastomeric fibers can enable the fabrication of functional fabrics for diverse applications including sensing for wearable and industrial textiles. Strain sensing textiles are gaining particular attention because of their increasing relevance in the development of smart devices for health, sports,...

The development of wearable devices such as smart watches, intelligent garments, and wearable health‐monitoring devices calls for suitable energy storage devices which have matching mechanical properties and can provide sufficient power for a reasonable duration. Stretchable fiber‐based supercapacitors are emerging as a promising candidates for thi...

The increasing developments in wearable electronics demand for compatible power sources such as yarn supercapacitors (YSCs) that can perform well in a limited footprint. MXene nanosheets, which are recently shown in the literature to have ultra-high volumetric capacitance are used here for the fabrication of YSCs in order to identify their potentia...

In article number 1600396, Shayan Seyedin, Joselito M. Razal, and co-workers discuss recent exciting advances in the synthesis, solution processing, and applications of graphene oxide liquid crystals. Some perspectives on the challenges and opportunities of graphene oxide liquid crystals for novel architectures are discussed to provide insights for...

Here we present a route for non-covalent functionalization of carboxylated multi-walled carbon nanotubes and graphene oxide with novel two-dimensional peptide assemblies. We show that self-assembled amino-terminated biantennary and tetraantennary oligoglycine peptides (referred to as tectomers) effectively coat carboxylated multi-walled carbon nano...

The liquid crystalline behavior of graphene oxide (GO) has enabled the design of facile and effective solution processing methods for assembling highly ordered macroscopic graphene structures, further expanding the development of novel graphene-based devices. In this progress report, first the preparation of liquid crystalline graphene oxide (LCGO)...

In this article, modified neural networks using genetic algorithms were employed to investigate the simultaneous effects of four of the most important parameters, namely; solution concentration (C); spinning distance (d); applied voltage (V); and volume flow rate (Q) on mean fiber diameter (MFD), as well as standard deviation of fiber diameter (Std...

Recent advances in wearable electronics, technical textiles, and wearable strain sensing devices have resulted in extensive research on stretchable electrically conductive fibers. Addressing these areas require the development of efficient fiber processing methodologies that do not compromise the mechanical properties of the polymer (typically an e...

Electrically conductive elastomeric fibres prepared using a wet-spinning process are promising materials for intelligent textiles, in particular as a strain sensing component of the fabric. However, these fibres, when reinforced with conducting fillers, typically result in a compromise between mechanical and electrical properties and, ultimately, i...

Although great attention has been paid to wearable electronic devices in recent years, flexible lightweight batteries or supercapacitors with high performance are still not readily available due to the limitations of the flexible electrode inventory. In this work, highly flexible, bendable and conductive rGO-PEDOT/PSS films were prepared using a si...

Recent developments in graphene oxide fibre (GO) processing include exciting demonstrations of hand woven textile structures. However, it is uncertain whether the fibres produced can meet the processing requirements of conventional textile manufacturing. This work reports for the first time the production of highly flexible and tough GO fibres that...

A scaled-up fiber wet-spinning production of electrically conductive and highly stretchable PU/PEDOT:PSS fibers is demonstrated for the first time. The PU/PEDOT:PSS fibers possess the mechanical properties appropriate for knitting various textile structures. The knitted textiles exhibit strain sensing properties that were dependent upon the number...

The use of large graphene oxide (GO) sheets as a filler enables the continuous fabrication of elastomeric composite fibers with remarkable stiffness and no loss of stretchability compared to the parent elastomeric polymer. J. M. Razal, G. G. Wallace, and co-workers report the production of the fibers on page 94, and provide insights into how the GO...

The optimization of processing conditions and material chemistries has enabled the uniform integration of PEDOT:PSS within a polyurethane matrix to fabricate elastomeric fibers with high electrical conductivity, using a simple fibre wet spinning process. J. M. Razal, G. G. Wallace, and co-workers report the fabrication of these fibres on page 2957,...

The use of fine fiber has become an important design tool for filter media. Nanofibers based filter media have some advantages as lower energy consumption, longer filter life, high filtration capacity, easier maintenance, low weight rather than other filter media. The nanofibers based filter media made up of fibers of diameter ranging from 100 to 1...

Precise control of fiber diameter during electrospinning is very crucial for many applications. A systematic and quantitative study on the effects of processing variables enables us to control the properties of electrospun nanofibers. In this contribution, response surface methodology (RSM) was employed to quantitatively investigate the simultaneou...

In this paper, direct tracking method as an image analysis based technique for measuring electrospun nanofiber diameter has been presented and compared with distance transform method. Samples with known characteristics generated using a simulation scheme known as µ-randomness were employed to evaluate the accuracy of the method. Electrospun webs of...

Nanofibers produced by electrospinning method are widely used for drug delivery, as tissue scaffolding materials and filtration purposes where specific pore characteristics are required. For continued growth in these areas, it is critical that the nanofibers be properly designed for these applications to prevent failure. Most of the current methods...

In electrospinning, fiber diameter is an important structural characteristic because it directly affects the properties of the produced webs. In this chapter, we have developed an image analysis based method called direct tracking for measuring electrospun fiber diameter. In order to evaluate its accuracy, samples with known characteristics have be...

In the first part of this chapter electrospinning process of nanofiber is introduced. In the second part, a new image analysis technique for measuring the diameters of electrospun nanofibers is developed.

In this contribution, response surface methodology (RSM) was employed to investigate the simultaneous effects of four of the most important parameters, namely solution concentration (C), spinning distance (d), applied voltage (V) and volume flow rate (Q) on mean fiber diameter (MFD) as well as standard deviation of fiber diameter (StdFD) in electro...

Nanofibers produced by electrospinning method are widely used for drug delivery, as tissue scaffolding materials and filtration purposes where specific pore characteristics are required. For continued growth in these areas, it is critical that the nanofibers be properly designed for these applications to prevent failure. Most of the current methods...

Fiber diameter is an important structural characteristic for electrospinning process, due to its direct influence on the properties of the produced webs. In this chapter, an image analysis based method called Direct Tracking for measuring electrospun fiber diameter has been developed. Another image analysis method, Distance Transform, was also adap...

In this chapter, a new distance transform method for measuring fiber diameter in electrospun nanofiber webs has been describerd. In this algorithm, the effect of intersection has been eliminated which brings more accuracy to the measurement. The effectiveness of the method was evaluated by a series of simulated images with known characteristics as...

The precise control of fiber diameter during electrospinning is very crucial for many applications. A systematic and quantitative study on the effects of processing variables enables us to control the properties of electrospun nanofibers. In this contribution, response surface methodology (RSM) was employed to quantitatively investigate the simulta...

A new method based on image analysis for electrospun nanofibre diameter measurement is presented. First, the SEM micrograph of the nanofibre web obtained by electrospinning process is converted to binary image using local thresholding method. In the next step, skeleton and distance transformed image are generated. Then, the intersection points whic...

This paper describes a new distance transform method used for measuring fiber diameter in electrospun nanofiber webs. In this algorithm, the effect of intersection is eliminated, which brings more accuracy to the measurement. The method is tested by a series of simulated images with known characteristics as well as some real webs obtained from elec...

Nanofibers produced by electrospinning method are widely used for drug delivery, as tissue scaffolding materials and filtration purposes where specific pore characteristics are required. For continued growth in these areas, it is critical that the nanofibers be properly designed for these applications to prevent failure. Most of the current methods...

Fiber diameter is the most important characteristic in electrospun nonwoven webs. Understanding how it is influenced by the electrospinning parameters is essential to produce webs with desired characteristics. In this contribution, Direct Tracking method for measuring electrospun fiber diameter is described. To evaluate the accuracy of the techniqu...

In this chapter, a novel approach is presented for determination of nanofiber diameter of electrospun webs. In this approach we have demonstrated the general applicability of a method using real webs, taking into account 5 real electrospun nonwoven webs, which were obtained by electrospinning of PVA. The application of image analysis has been revie...

In this paper, a new image analysis based method for electrospun nanofiber diameter measurement has been presented. The method was tested by a simulated image with known characteristics and a real web. Mean (M) and standard deviation (STD) of fiber diameter obtained using this method for the simulated image were 15.02 and 4.80 pixels respectively,...