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Relevant bibliographies by topics / Rheology of Inks

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Academic literature on the topic 'Rheology of Inks'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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Journal articles on the topic "Rheology of Inks"

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Otsubo, Yasufumi. "Rheology and Printability of Inks." Seikei-Kakou 22, no. 8 (2010): 392–97. http://dx.doi.org/10.4325/seikeikakou.22.392.

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Wang, Z., X. Wang, and T. Fang. "The rheology of the offset inks." Surface Coatings International 81, no. 5 (1998): 219–22. http://dx.doi.org/10.1007/bf02693862.

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Tseng, Wenjea J., and Chun-Nan Chen. "Dispersion and rheology of nickel nanoparticle inks." Journal of Materials Science 41, no. 4 (2006): 1213–19. http://dx.doi.org/10.1007/s10853-005-3659-z.

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ISODA, Takenobu, and Misao HORIGOME. "Development of A Novel Instrument for Rheological Measurement of Printing Inks." Nihon Reoroji Gakkaishi 27, no. 4 (1999): 227–34. http://dx.doi.org/10.1678/rheology.27.227.

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Vadillo, Julen, Izaskun Larraza, Tamara Calvo-Correas, Nagore Gabilondo, Christophe Derail, and Arantxa Eceiza. "Design of a Waterborne Polyurethane–Urea Ink for Direct Ink Writing 3D Printing." Materials 14, no. 12 (2021): 3287. http://dx.doi.org/10.3390/ma14123287.

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In this work, polycaprolactone–polyethylene glycol (PCL–PEG) based waterborne polyurethane–urea (WBPUU) inks have been developed for an extrusion-based 3D printing technology. The WBPUU, synthesized from an optimized ratio of hydrophobic polycaprolactone diol and hydrophilic polyethylene glycol (0.2:0.8) in the soft segment, is able to form a physical gel at low solid contents. WBPUU inks with different solid contents have been synthesized. The rheology of the prepared systems was studied and the WBPUUs were subsequently used in the printing of different pieces to demonstrate the relationship between their rheological properties and their printing viability, establishing an optimal window of compositions for the developed WBPUU based inks. The results showed that the increase in solid content results in more structured inks, presenting a higher storage modulus as well as lower tan δ values, allowing for the improvement of the ink’s shape fidelity. However, an increase in solid content also leads to an increase in the yield point and viscosity, leading to printability limitations. From among all printable systems, the WBPUU with a solid content of 32 wt% is proposed to be the more suitable ink for a successful printing performance, presenting both adequate printability and good shape fidelity, which leads to the realization of a recognizable and accurate 3D construct and an understanding of its relationship with rheological parameters.

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Wang, Na, Xian Fu Wei, Xiao Xue Jia, Ping Xiu Ning, and Ling Ya Gu. "Influence of Tack Reducer and Varnish on the Rheological Behavior of Offset Inks." Advanced Materials Research 174 (December 2010): 413–16. http://dx.doi.org/10.4028/www.scientific.net/amr.174.413.

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The rheology behavior of the offset ink has strong contact with its printability. Tack reducer and varnish are often used to adjust the tack volume and viscosity of the ink. In order to study the influence of the variation of both tack volume and viscosity of the ink on the rheology behavior, tack reducer and varnish are used to adjust the tack volume and viscosity of the ink, the influence of the volume on the tack volume and viscosity are obtained and also the influence degree on rheology behavior by variation of the tack volume and viscosity. The results indicate that: the tack volume of ink decreases with the increasing of the tack reducer and the viscosity is the same; the viscosity decreases with the increasing of the varnish and the tack volume is also descended. Both the tack reducer and the varnish can change the tack volume and the viscosity, but the degree is different. The volume of the tack reducer and the varnish also has certain influence on the thixotropic and the dynamic viscoelastic of the ink.

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Suzuki, Takahiro, Shinya Okada, and Shohji Tsushima. "Characterization of Catalyst Inks By Rheology and Microscopic Particle Properties." ECS Transactions 86, no. 13 (2018): 193–98. http://dx.doi.org/10.1149/08613.0193ecst.

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Glasser, Alizée, Éric Cloutet, Georges Hadziioannou, and Hamid Kellay. "Tuning the Rheology of Conducting Polymer Inks for Various Deposition Processes." Chemistry of Materials 31, no. 17 (2019): 6936–44. http://dx.doi.org/10.1021/acs.chemmater.9b01387.

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Amorim, P. A., M. A. d’Ávila, R. Anand, P. Moldenaers, P. Van Puyvelde, and V. Bloemen. "Insights on shear rheology of inks for extrusion-based 3D bioprinting." Bioprinting 22 (June 2021): e00129. http://dx.doi.org/10.1016/j.bprint.2021.e00129.

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Potts, Sarah-Jane, Chris Phillips, Tim Claypole, and Eifion Jewell. "The Effect of Carbon Ink Rheology on Ink Separation Mechanisms in Screen-Printing." Coatings 10, no. 10 (2020): 1008. http://dx.doi.org/10.3390/coatings10101008.

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Screen-printable carbon-based inks are available in a range of carbon morphologies and concentrations, resulting in various rheological profiles. There are challenges in obtaining a good print when high loading and elasticity functional inks are used, with a trade-off often required between functionality and printability. There is a limited understanding of how ink rheology influences the ink deposition mechanism during screen-printing, which then affects the print topography and therefore electrical performance. High speed imaging was used with a screen-printing simulation apparatus to investigate the effect of viscosity of a graphite and carbon-black ink at various levels of solvent dilution on the deposition mechanisms occurring during screen-printing. With little dilution, the greater relative volume of carbon in the ink resulted in a greater tendency towards elastic behavior than at higher dilutions. During the screen-printing process this led to the ink splitting into filaments while remaining in contact with both the mesh and substrate simultaneously over a greater horizonal length. The location of separating filaments corresponded with localized film thickness increases in the print, which led to a higher surface roughness (Sz). This method could be used to make appropriate adjustments to ink rheology to overcome print defects related to poor ink separation.

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Dissertations / Theses on the topic "Rheology of Inks"

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Mathe, Ntombizodwa. "The rheology of silicon nanoparticle inks fro screen printing electronic devices." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/6536.

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In the development of inks for printed electronics, it is important to understand the behaviour of the functional inks and more especially their rheology and surface properties. This project emphasises the importance of ink characterization by performing rheological tests on silicon nanoparticle based inks that are used in the screen printing of electronic devices. The inks were characterized for linear viscoelastic behaviour, flow behaviour, change in properties with angular frequency, as well as thixotropic behaviour. All showed shear thinning, with the more dilute inks showing a power law (Ostwald / de Waele model) behaviour dependence of complex viscosity on angular frequency. The flow behaviour of the inks was also seen to follow a Windhab model. The printability of the inks primarily depends on the shear-dependent viscosity as highly viscous and dilute inks do not produce good printed structures. The printed layers showed electrical and optical activity.

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Govindarajan, Sudhanva Raj. "THE DESIGN OF A MULTIFUNCTIONAL INITIATOR-FREE SOFT POLYESTER PLATFORM FOR ROOM-TEMPERATURE EXTRUSION-BASED 3D PRINTING, AND ANALYSIS OF PRINTABILITY." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1466778249.

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Thompson, Martin J. "The microstructure and rheology of emulsions of water in lithographic printing ink." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426635.

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Wang, Xi. "Drop-on-demand inkjet deposition of complex fluid on textiles." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26624.

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Thesis (Ph.D)--Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Wallace W. Carr; Committee Member: Anselm Griffin; Committee Member: Carson J. Meredith; Committee Member: David G. Bucknall; Committee Member: Jeffrey F. Morris. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Rosello, Maxime. "Études numérique et expérimentale de l'instabilité de Rayleigh-Plateau : Application aux jets d'encres." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI057.

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L'instabilité de Rayleigh-Plateau est utilisée dans les dispositifs d'impression à jet continu (CIJ) afin de piloter la dynamique de brisure des jets d'encre. Son étude dans ce cas de figure s'inscrit dans un cadre pluridisciplinaire relevant de la mécanique des fluides, de la rhéologie, ou encore de la physique des polymères. Le travail effectué se focalise sur l'influence des propriétés du fluide ainsi que de la géométrie de la buse d'impression sur cette dynamique. Ainsi, la caractérisation expérimentale des propriétés physicochimiques et rhéométriques des encres fait l'objet d'une attention particulière. La dynamique de brisure est ensuite modélisée à l'aide de différents logiciels de simulation numérique puis comparée aux expériences effectuées par ailleurs. Ces simulations prennent en compte lorsque c'est le cas les comportements non newtoniens des encres étudiées telles que leur propriétés rhéofluidifiantes ou viscoélastiques. Un lien étroit entre la dynamique de brisure et la forme du profil de vitesse en sortie de la buse est mis en évidence. Ce lien semble constituer une piste d'investigation particulièrement intéressante dans le cadre de la prédiction des dynamiques de jets obtenues par les dispositifs d'impression industriels<br>Rayleigh-Plateau instability is used in continuous ink jet (CIJ) printers in order to drive ink jets breakup. Studies of such mechanisms are based on pluri-disciplinary concepts dealing with fluid mechanics, rheology and polymer sciences. The present work focuses on fluid properties and nozzles designs influences onto breakup dynamics. In this context, the experimental characterization of ink physical and rheological properties are of particular interest. Thereafter, jet dynamics computations are performed using several software and compared with experiences. Potential non Newtonian behaviours such as shear-thinning or viscoelasticity are modelled by computations. A close link between breakup dynamics and velocity profile at the nozzle exit is highlighted. This link is believed to bring crucial information for the prediction of jet dynamics observed in industrial printers

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Magnier, Romain. "Étude et optimisation de l'imprimabilité de films PVC produits par calandrage et enduction." Thesis, Paris, ENMP, 2015. http://www.theses.fr/2015ENMP0005/document.

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La qualité d'impression est une notion difficile à maîtriser. L'œil est souvent utilisé en industrie comme outil permettant de juger la qualité d'un film polymère imprimé. Afin d'atteindre un niveau supérieur de qualité, il est nécessaire de trouver un moyen pour quantifier la qualité d'impression, et ainsi permettre d'atteindre soit une qualité dite « point par point », soit une qualité dite « all-over ». Plusieurs éléments sont nécessaires à cette quantification : une image en microscopie optique de l'échantillon, ainsi qu'une valeur d'intensité moyenne et d'homogénéité de couleur, que l'on obtient grâce à un rugosimètre confocal. Ainsi nous avons pu définir, pour un support mis en forme par calandrage et un support mis en forme par enduction, les paramètres majeurs agissant sur la qualité d'impression. En termes de procédé, il apparaît que la vitesse d'impression et la pression du cylindre presseur influencent grandement l'imprimabilité. Au niveau des matériaux utilisés, la viscosité et la tension de surface de l'encre ont un effet important alors qu'en termes de support, un film calandré sera plus sensible aux variations des différents paramètres qu'un film enduit<br>Printing quality idea is hard to control. In industry, eye is often used to judge the quality of a printed polymer film. In order to get a new level in terms of printing quality and get “point by point” or “all-over” quality, it is necessary to find a way to quantify printing quality. Some elements are important concerning the quantification of the printing quality: an optical microscopic image, a value of the average intensity and a value on the homogeneity of the color. We can define, for a calendered and a coated substrate, the main parameters acting on the printing quality. Printing speed and pressure of the rubber roll are the two main process parameters to act, viscosity and surface tension of the ink are the two main ink properties to act, while the calendered substrate is more sensitive to the variation of the parameters than the coated one

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Albahrani, Sayed Mohamed Baqer. "Photoluminescent CdSe/CdS/ZnS quantum dots for temperature and pressure sensing in elastohydrodynamic." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI016/document.

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La température et la pression sont deux paramètres particulièrement importants pour l’optimisation des performances du régime de lubrification élastohydrodynamique (EHL). A ce jour, différentes méthodes expérimentales ont été développées, avec plus ou moins du succès, pour la mesure de ces deux paramètres. Ce travail présente, en continuité de ces approches, des investigations visant à développer une nouvelle technique in situ permettant de mesurer localement ces deux grandeurs dans les contacts élastohydrodynamiques (EHD). Cette technique exploite la sensibilité en photoluminescence (PL) des boîtes quantiques (ou en anglais « quantum dots (QDs)) de CdSe/CdS/ZnS aux variations de température et de pression. A cet égard, des calibrations ont été réalisées afin d’évaluer la sensibilité de ces QDs aux deux paramètres. De plus, la versatilité de ces QDs comme nanosondes a été examinée en testant deux lubrifiants différents : le squalane et un mélange de squalane et de cyclopentane. Des mesures ont été également effectuées sous conditions dynamiques afin d’étudier (i) l’influence de la présence des QDs sur la rhéologie du lubrifiant et (ii) l’influence du taux de cisaillement sur la PL des QDs. Bien que ces différents tests aient prouvé le potentiel des QDs de CdSe/CdS/ZnS, ils ont révélé l’existence d’autres paramètres qui peuvent, tout comme la température et la pression, en modifier la réponse. L’étude a été menée afin d’approfondir la compréhension des mécanismes responsables de tels effets. Plus important encore, une méthodologie a été définie pour minimiser ces effets indésirables, et pour in fine, permettre l’usage de ces QDs en tant que nanosondes fiables<br>Temperature and pressure are two relevant parameters for the optimization of lubrication performance in the elastohydrodynamic lubrication (EHL) regime. To date, various experimental methods have been developed to measure these two parameters with more or less success. In a continuation of these efforts, some investigations are presented in the current work in view of developing a new in situ technique allowing for local measurements of these two parameters throughout elastohydrodynamic (EHD) contacts. This technique exploits the photoluminescence (PL) sensitivity of CdSe/CdS/ZnS quantum dots (QDs) to changes in temperature and pressure. In this respect, calibrations have been carried out in order to establish the sensitivity of these QDs to the two parameters. Moreover, the versatility of these QDs for sensing applications have been examined by testing two different lubricants, namely squalane and a mixture of squalane and cyclopentane. Some measurements were also conducted under dynamic conditions, in order to study (i) the influence of the QDs presence on the lubricant rheology and (ii) the influence of shear rate on the PL of QDs. Although these different tests demonstrated the potential of CdSe/CdS/ZnS QDs, they revealed the existence of other parameters that affect, in addition to temperature and pressure, their response. A comprehensive study was thus conducted in order to elucidate the mechanisms behind these findings. More importantly, a methodology was defined in order to minimize these undesired influences and, in fine, enable these QDs to be used as reliable nanosensors

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(7023458), Jacob M. Faulkner. "PROCESSING OF NANOCOMPOSITES AND THEIR THERMAL AND RHEOLOGICAL CHARACTERIZATION." Thesis, 2019.

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<p>Polymer nanocomposites are a constantly evolving material category due to the ability to engineer the mechanical, thermal, and optical properties to enhance the efficiency of a variety of systems. While a vast amount of research has focused on the physical phenomena of nanoparticles and their contribution to the improvement of such properties, the ability to implement these materials into existing commercial or newly emerging processing methods has been studied much less extensively. The primary characteristic that determines which processing technique is the most viable is the rheology or viscosity of the material. In this work, we investigate the processing methods and properties of nanocomposites for thermal interface and radiative cooling applications. The first polymer nanocomposite examined here is a two-component PDMS with graphene filler for 3D printing via a direct ink writing approach. The composite acts as a thermal interface material which can enhance cooling between a microprocessor and a heat sink by increasing the thermal conductivity of the gap. Direct ink writing requires a shear thinning ink with specific viscoelastic properties that allow for the material to yield through a nozzle as well as retain its shape without a mold following deposition. No predictive models of viscosity for nanocomposites exist; therefore, several prominent models from literature are fit with experimental data to describe the change in viscosity with the addition of filler for several different PDMS ratios. The result is an understanding of the relationship between the PDMS component ratio and graphene filler concentration with respect to viscosity, with the goal of remaining within the acceptable limits for printing via direct ink writing. The second nanocomposite system whose processability is determined is paint consisting of acrylic filled with reflective nanoparticles for radiative cooling paint applications. The paint is tested with both inkjet and screen-printing procedures with the goal of producing a thermally invisible ink. Radiative cooling paint is successfully printed for the first time with solvent modification. This work evaluates the processability of polymer nanocomposites through rheological tailoring. </p><br>

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(8922227), Mohamadreza Moini. "BUILDABILITY AND MECHANICAL PERFORMANCE OF ARCHITECTURED CEMENT-BASED MATERIALS FABRICATED USING A DIRECT-INK-WRITING PROCESS." Thesis, 2020.

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<p></p><p>Additive Manufacturing (AM) allows for the creation of elements with novel forms and functions. Utilizing AM in development of components of civil infrastructure allows for achieving more advanced, innovative, and unique performance characteristics. The research presented in this dissertation is focused on development of a better understanding of the fabrication challenges and opportunities in AM of cement-based materials. Specifically, challenges related to printability and opportunities offered by 3D-printing technology, including ability to fabricate intricate structures and generate unique and enhanced mechanical responses have been explored. Three aspects related to 3D-printing of cement-based materials were investigated. These aspects include: fresh stability of 3D-printed elements in relation to materials rheological properties, microstructural characteristics of the interfaces induced during the 3D-printing process, and the mechanical response of 3D-printed elements with bio-inspired design of the materials’ architecture. This research aims to contribute to development of new pathways to obtain stability in freshly 3D-printed elements by determining the rheological properties of material that control the ability to fabricate elements in a layer-by-layer manner, followed by the understanding of the microstructural features of the 3D-printed hardened cement paste elements including the interfaces and the pore network. This research also introduces a new approach to enhance the mechanical response of the 3D-printed elements by controlling the spatial arrangement of individual filaments (i.e., materials’ architecture) and by harnessing the weak interfaces that are induced by the 3D-printing process. </p><br><p></p>

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Books on the topic "Rheology of Inks"

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Douglas, Kenneth. Bioprinting. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190943547.001.0001.

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Abstract: This book describes how bioprinting emerged from 3D printing and details the accomplishments and challenges in bioprinting tissues of cartilage, skin, bone, muscle, neuromuscular junctions, liver, heart, lung, and kidney. It explains how scientists are attempting to provide these bioprinted tissues with a blood supply and the ability to carry nerve signals so that the tissues might be used for transplantation into persons with diseased or damaged organs. The book presents all the common terms in the bioprinting field and clarifies their meaning using plain language. Readers will learn about bioink—a bioprinting material containing living cells and supportive biomaterials. In addition, readers will become at ease with concepts such as fugitive inks (sacrificial inks used to make channels for blood flow), extracellular matrices (the biological environment surrounding cells), decellularization (the process of isolating cells from their native environment), hydrogels (water-based substances that can substitute for the extracellular matrix), rheology (the flow properties of a bioink), and bioreactors (containers to provide the environment cells need to thrive and multiply). Further vocabulary that will become familiar includes diffusion (passive movement of oxygen and nutrients from regions of high concentration to regions of low concentration), stem cells (cells with the potential to develop into different bodily cell types), progenitor cells (early descendants of stem cells), gene expression (the process by which proteins develop from instructions in our DNA), and growth factors (substances—often proteins—that stimulate cell growth, proliferation, and differentiation). The book contains an extensive glossary for quick reference.

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Book chapters on the topic "Rheology of Inks"

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Tabbernor, A. "Rheology of Printing Inks." In The Printing Ink Manual. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-011-7097-0_13.

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Tabbernor, A. "Rheology of Printing Inks." In The Printing Ink Manual. Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-6906-6_13.

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Tuladhar, Tri. "Measurement of Complex Rheology and Jettability of Inkjet Inks." In Handbook of Industrial Inkjet Printing. Wiley-VCH Verlag GmbH & Co. KGaA, 2017. http://dx.doi.org/10.1002/9783527687169.ch22.

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Dybowska-Sarapuk, Łucja, Jerzy Szałapak, Grzegorz Wróblewski, Iwona Wyżkiewicz, Marcin Słoma, and Małgorzata Jakubowska. "Rheology of inks for various techniques of printed electronics." In Advanced Mechatronics Solutions. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-23923-1_65.

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Żołek-Tryznowska, Zuzanna. "Rheology of Printing Inks." In Printing on Polymers. Elsevier, 2016. http://dx.doi.org/10.1016/b978-0-323-37468-2.00006-3.

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Douglas, Kenneth. "Introduction." In Bioprinting. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190943547.003.0001.

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Abstract: Bioprinting: To Make Ourselves Anew describes how bioprinting emerged from 3D printing and details the accomplishments and challenges in bioprinting tissues of cartilage, skin, bone, muscle, neuromuscular junctions, liver, heart, lung, and kidney. It explains how scientists are attempting to provide these bioprinted tissues with a blood supply and the ability to carry nerve signals so that the tissues might be used for transplantation into persons with diseased or damaged organs. The book presents all the common terms in the bioprinting field and clarifies their meaning using plain language. The reader will learn about bioink—a bioprinting material containing living cells and supportive biomaterials. Additionally, readers will become at ease with concepts such as fugitive inks (sacrificial inks used to make channels for blood flow), extracellular matrices (the biological environment surrounding cells), decellularization (the process of isolating cells from their native environment), hydrogels (water-based substances that can substitute for the extracellular matrix), rheology (the flow properties of a bioink), bioreactors (containers to provide the environment cells need to thrive and multiply). Further vocabulary that will become familiar includes diffusion (passive movement of oxygen and nutrients from regions of high concentration to regions of low concentration), stem cells (cells with the potential to develop into different bodily cell types), progenitor cells (early descendants of stem cells), gene expression (the process by which proteins develop from instructions in our DNA), and growth factors (substances—often proteins—that stimulate cell growth, proliferation, and differentiation). The book contains an extensive glossary for quick reference.

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"Colour Plates." In Practical Food Rheology. Wiley-Blackwell, 2010. http://dx.doi.org/10.1002/9781444391060.ins.

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"Supplemental Images." In Nonlinear Polymer Rheology. John Wiley & Sons, Inc, 2018. http://dx.doi.org/10.1002/9781119029038.ins.

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WANG, PENG, and TI-QIAN JIANG. "CONSTITUTIVE EQUATION FOR THE INK OF BALL-POINT PEN AND PRINTING." In Theoretical and Applied Rheology. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-89007-8.50041-1.

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Conference papers on the topic "Rheology of Inks"

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Jaipean, Bryson, Kevin Estelle, Ruchira Tandel, and B. Arda Gozen. "Fused Filament Deposition of Silicone Blends With Tunable Mechanical Properties." In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8329.

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Abstract Addition-cured silicones are widely used in emerging soft robotics and wearable device technologies which can benefit greatly from the customizability offered by versatile 3D printing methods such as fused filament deposition (FFD). However, precursors of addition-cured silicones, particularly the ones with high compliance, are generally incompatible with 3D printing due to their rheological properties. Several silicones with rheological properties suitable for 3D printing lacks the compliance necessary for many application. This paper explores FFD of composite silicone inks consisting of two types of addition cured silicone precursors with different rheology and mechanical properties: inherently 3D-printable Dow SE-1700 with low compliance and non-printable Smooth-On EcoFlex 00-10 with high compliance. Specifically, blended ink rheology, morphology and the mechanical properties of the printed structures are experimentally studied. It was shown that 3D printable rheology was maintained in inks that contained up to 33% EcoFlex 00-10, even though the reduction in the elastic moduli and the yield stress were noted. Inclusion of EcoFlex 00-10, led to smoother side walls of the printed structures at an optimal composition. Through varying the relative composition of the two components, 100% tensile moduli of the printed structures can be controlled between 959–347 kPa. Several issues are noted associated with the transient behavior of the blended inks due to short pot life of the EcoFlex 00-10.

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More, Priyesh V., Sunho Jeong, Yeong-Hui Seo, et al. "Rheology and stability kinetics of bare silicon nanoparticle inks for low-cost direct printing." In 3RD INTERNATIONAL ADVANCES IN APPLIED PHYSICS AND MATERIALS SCIENCE CONGRESS. AIP, 2013. http://dx.doi.org/10.1063/1.4849245.

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Hoffman, Casey J., and Daniel F. Walczyk. "Direct Spraying of Catalyst Inks for PEMFC Electrode Manufacturing." In ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/fuelcell2011-54416.

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Automated manufacturing techniques are needed to reduce production costs for polymer electrolyte membrane (PEM) fuel cell electrodes. The work presented in this paper focuses on the use of a low pressure, low volume direct spray valve that uses air pressure to atomize fluids and transfer them to a gas diffusion layer (GDL) to produce a gas diffusion electrode (GDE). Two of these electrodes would then be joined with a polymer electrolyte membrane to produce a fuel cell membrane electrode assembly (MEA). Accurate and reproducible deposition methods such as this will result in less wasted materials, especially platinum, and increased throughput compared to common laboratory-scale techniques such as paint brushing and Mayer-rod coating. In this study, the production of inks will be discussed including a catalyst ink containing platinum nano-particles supported on carbon (20% loading by weight) and a similar analog ink which is identical except for that it does not contain the platinum. Two different substrates, mylar transparency film and actual carbon paper GDL substrate will be used and presented in this study. Ink rheology (viscosity, solids content, etc.) will also be discussed as it pertains to optimizing spray pattern uniformity and process efficiency. Initial results of thickness measurements which are used for determining uniformity and the required overlapping of multiple coats will be presented. In addition, a comparison of scanning electron microscopy (SEM) images of electrode surface structures prepared by mayer-rod and spraying will be shown. A brief discussion of the future work planned by the authors in order to study the effects of processing variables on actual fuel cell performance will also be given.

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Habib, Md Ahasan, and Bashir Khoda. "A Rheological Study of Bio-Ink: Shear Stress and Cell Viability." In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-63996.

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Abstract 3D bio-printing is an emerging technology to fabricate tissue scaffold in-vitro through the controlled allocation of biomaterial and cell, which can mimic the in-vivo counterpart of living tissue. Live cells are often encapsulated into the biomaterials (i.e., bio-ink) and extruded by controlling the printing parameters. The functionality of the bioink depends upon three factors: (a) printability, (b) shape fidelity, and (c) bio-compatibility. Increasing viscosity will improve the printability and the shape fidelity; but will require higher applied extrusion pressure, which is detrimental to the living cell dwelling in the bio-ink, which is often ignored in bio-ink optimization process. In this paper, we demonstrate a roadmap to develop and characterize bio-inks ensuring the printability, shape fidelity, and cell survivability, simultaneously. The pressure exerted on the bio-ink during extrusion processes is measured analytically and the information is incorporated in the rheology design of the bio-ink. Cell-laden filament is fabricated with Human Embryonic Kidney (HEK 293) cell and analyzed the cell viability. The overall cell viability of the filament fabricated with 8 psi and 12 psi is 90% and 74% respectively. Additionally, a crossectional live-dead assay of the printed filament with HEK 293 cell is performed which demonstrates the spatial pattern that matches our findings as well.

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MONDAL, ANIRBAN, MUSA SUKATI, MOHAMMAD CHARARA, et al. "Investigation of Rheology and 3D Printability of PDMS Nanocomposites Ink." In American Society for Composites 2019. DEStech Publications, Inc., 2019. http://dx.doi.org/10.12783/asc34/31295.

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Herren, Blake, Tingting Gu, Qinggong Tang, Mrinal Saha, and Yingtao Liu. "3D Printing and Stretching Effects on Alignment Microstructure in PDMS/CNT Nanocomposites." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10512.

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Abstract The alignment of high aspect ratio reinforcing nanoparticles within a polymer matrix can have significant effects on the mechanical, electrical, and thermal properties of the nanocomposite. Therefore, in order to tailor the properties of the composite, it is imperative to develop novel methods to control the alignment of these filler particles in various polymeric matrices. This paper reports a unique approach to alter the alignment of carbon nanotubes (CNT) within polydimethylsiloxane (PDMS) nanocomposites using 3D printing technology. A line of the reinforced PDMS resin is printed on a PDMS substrate using direct ink writing technology, which can produce alignment in the print direction depending on printing parameters, the loading of the reinforcing particle, and the rheology of the ink. Then, the substrate is stretched and placed in an oven to cure the printed nanocomposites line with increased alignment in the stretch direction. These two techniques have the advantage of simplicity over other techniques and can efficiently manufacture nanocomposites with the alignment of nanoparticles. Optical microscopy will be used to quantify the alignment within the printed line. Electrical and mechanical properties will be tested to determine the effects of the different alignments within the elastomer. The ability to control the alignment of elastomeric CNT composites is advantageous for the growing field of polymer-based electronics.

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