Direct Ink Writing of 3D Functional Materials

Lewis, Jennifer A.

doi:10.1002/adfm.200600434

Cited by 1,393 publications

(1,022 citation statements)

References 79 publications

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“…These methods were utilized previously for the controlled gelation of alumina, barium titanate, and lead zirconate titanate suspensions [6,[24][25][26][27][28]34]. In the first method, inks were prepared by adding poly(ethylene imine) (PEI) to the system.…”

Section: Pmn Gel Preparationmentioning

confidence: 99%

“…Furthermore, colloidal inks developed for the robotic deposition must able to flow through the nozzle and then set immediately to keep the shape retention. In other words, the particle network must be able to resist stresses arising from capillary tension [6,21,22]. Therefore, preparation of colloidal inks that are capable of flowing through the nozzles of varying size and then setting immediately to facilitate shape retention of the deposited features is crucial in direct writing techniques [4,23].…”

Section: Introductionmentioning

confidence: 99%

“…These structures may find applications in tissue engineering [1][2][3], microfluidic networks, actuators, sensors, and other electronic ceramic devices [4][5][6][7][8][9]. Some of these applications require use of functional materials such as ferroelectric ceramics.…”

Section: Introductionmentioning

confidence: 99%

“…This is followed by a fluid-to-gel transition which is necessary for the printing operation. In order to maintain structural integrity robocasting relies on the rheology of the deposited paste [6,8,9]. The important rheological parameters for the printing ink include the apparent viscosity, yield stress under shear and compression, and viscoelastic properties [4,23].…”

Section: Introductionmentioning

confidence: 99%

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Rheological behavior of PMN gels for solid freeform fabrication

Şakar‐Deliormanlı¹,

Çelik²,

Polat³

2008

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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a b s t r a c tLead magnesium niobate (PMN) is a relaxor ferroelectric material and have widespread applications in the manufacture of multilayer electronic devices such as ceramic capacitors, actuators and transducers. The dielectric constant of this electrostrictive material is much higher than the well known ferroelectric barium titanate. However, aqueous processing of PMN is not investigated yet especially for the novel wet shaping fabrication. In this study, concentrated aqueous colloidal PMN gels have been designed to use in the robocasting process. Concentrated PMN suspensions were stabilized by polyacrylic acid and then gelation induced by changing the pH or ionic strength of the suspension or by addition of a cationic polyelectrolyte to the system. Through this procedure it was essential to understand the solid-liquid transition under shear to explore the feasibility of forming without excessive use of polymers. Therefore, rheological response of the samples having a gel network was investigated. Results showed that gelation induced by cationic polyethylene imine or by multivalent salts were successful methods in preparation of PMN gels. However, gelation induced by changing the pH of the suspension was challenging due to ion dissolution from PMN surface.

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Section: Pmn Gel Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rheological behavior of PMN gels for solid freeform fabrication

Şakar‐Deliormanlı¹,

Çelik²,

Polat³

2008

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Direct-print -a recently developed process of creating conductive patterns, complex structures, and tissue engineering scaffolds -uses jetting technologies, including inkjet printing and the continuous dispensing of filament. Direct-print is highly appreciated for processes such as laser-guided direct writing for applications in biotechnology (Odde & Renn, 1999), and complex functional materials (Lewis, 2006;Vatani, Lu, Lee, Kim, & Choi, 2013).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of post-impact droplet deformation for direct-print

Hasan

Chandy

Choi

2015

Engineering Applications of Computational Fluid Mechanics

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Two-dimensional (2D) numerical investigations of droplet impacts on a solid surface and the consequent deformation have been performed. The application lies in the direct-print technology where droplets are used to create lines and instantly cured to maintain line dimension. The investigation focuses on the evolution of droplet shape at the initial stage after the impact for Newtonian fluids. More specifically, the investigation emphasized the time for an impacted droplet to start increasing its diameter after the initial compression due to impact. A computational model has been developed by utilizing an adaptive quadtree spatial discretization with piecewise-linear geometrical volume-of-fluid (VOF) for this multiphase problem. The continuum-surface-force method and the height-function (HF) were employed for estimating the surface tension and the interface curvature, respectively. The Gerris Flow Solver, an open-source finite-volume package, was used for developing the computational model. The investigation was performed for the governing parameters of the Froude number (Fr), Reynolds number (Re), and Weber number (We). The results are presented as the interface contour, spreading factor (ξ ), and deformation ratio (R δ ). The investigation shows that the results from the developed model have excellent agreement with the experimental results.

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Polymers for Additive Manufacturing

Xiao

Tey

et al. 2022

Encyclopedia of Polymer Science and Technology

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Additive manufacturing (AM), or 3D printing, has seen exponential growth in the past two decades, with more new techniques emerging and new materials available. AM was first established as an efficient technology for prototyping about four decades ago. Today, it is widely used in a variety of industries, including healthcare, automotive, aerospace, defense, and so on. Whilst AM is a general term, it consists of multiple drastically different techniques that need different forms of feedstock materials and processing conditions. This article reviews the current prevailing AM technology for polymers with a brief history, and then a focus on technological details, available materials, and the latest development for each method. The challenges and trends of AM toward next‐generation advanced manufacturing are also highlighted.

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Direct Ink Writing of 3D Functional Materials

Cited by 1,393 publications

References 79 publications

Rheological behavior of PMN gels for solid freeform fabrication

Rheological behavior of PMN gels for solid freeform fabrication

Numerical analysis of post-impact droplet deformation for direct-print

Polymers for Additive Manufacturing

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