scholarly journals Additive Manufacture of Three Dimensional Nanocomposite Based Objects through Multiphoton Fabrication

Polymers ◽  
2016 ◽  
Vol 8 (9) ◽  
pp. 325 ◽  
Author(s):  
Yaan Liu ◽  
Qin Hu ◽  
Fan Zhang ◽  
Christopher Tuck ◽  
Derek Irvine ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Additive Manufacture ◽  
Multiphoton Fabrication

Additive manufactured multi-material structure with directional specific mechanical properties based upon classical lamination theory

2018 ◽  
Vol 24 (7) ◽  
pp. 1212-1220 ◽  
Author(s):  
Sugavaneswaran M. ◽  
Arumaikkannu G.
Keyword(s):  
Mechanical Properties ◽  
Three Dimensional ◽  
Additive Manufacture ◽  
Material Structure ◽  
Loading Conditions ◽  
Content Type ◽  
Three Dimensional Printing ◽  
Classical Lamination Theory ◽  
Innovative Methodology ◽  
Lamination Theory

Purpose This paper aims to additive manufacture (AM) the multi-material (MM) structure with directional-specific mechanical properties based on the classical lamination theory of composite materials. Design/methodology/approach The polyjet three-dimensional printing (3DP) process is used to fabricate the MM structure with directional-specific mechanical properties. MMs within a layer are positioned and oriented based on the classical lamination theory to achieve directional-specific properties. Mechanical behavior of the AM structure was examined under various loading conditions to justify the directional-specific properties. Findings With MM processing capabilities of the polyjet 3DP machine, AM MM structures with directional-specific mechanical properties were fabricated. From experimentation, it was observed that the AM MM structure with a quasi-isotropic laminate has superior tensile and flexural strength, and the AM MM structure with an angle ply laminate has superior shear strength. Various mechanical properties determined through testing will be useful for the selection of an appropriate layup arrangement within a structure for appropriate loading conditions. Originality/value This study presents the innovative methodology for the fabrication of AM MM structures with tailor-made mechanical properties. The developed methodology paves way for using the polyjet 3DP MM structure for applications such as the complaint mechanism, snap fits and thin features, which require directional-specific properties.

scholarly journals Application of piezoelectric cells printing on three-dimensional porous bioceramic scaffold for bone regeneration

2019 ◽  
Vol 5 (2) ◽  
pp. 22 ◽  
Author(s):  
Ming-You Shie ◽  
Hsin-Yuan Fang ◽  
Yen-Hong Lin ◽  
Alvin Kai-Xing Lee ◽  
Joyce Yu ◽  
...  
Keyword(s):  
Cell Attachment ◽  
Three Dimensional ◽  
Fluorescein Isothiocyanate ◽  
Cellular Adhesion ◽  
Additive Manufacture ◽  
Cell Printing ◽  
Ceramic Scaffold ◽  
Porous Bioceramic ◽  
Bone Structures ◽  
Extrusion Technology

In recent years, the additive manufacture was popularly used in tissue engineering, as the various technologies for this field of research can be used. The most common method is extrusion, which is commonly used in many bioprinting applications, such as skin. In this study, we combined the two printing techniques; first, we use the extrusion technology to form the ceramic scaffold. Then, the stem cells were printed directly on the surface of the ceramic scaffold through a piezoelectric nozzle. We also evaluated the effects of polydopamine (PDA)-coated ceramic scaffolds for cell attachment after printing on the surface of the scaffold. In addition, we used fluorescein isothiocyanate to simulate the cell adhered on the scaffold surface after ejected by a piezoelectric nozzle. Finally, the attachment, growth, and differentiation behaviors of stem cell after printing on calcium silicate/polycaprolactone (CS/PCL) and PDACS/PCL surfaces were also evaluated. The PDACS/PCL scaffold is more hydrophilic than the original CS/PCL scaffold that provided for better cellular adhesion and proliferation. Moreover, the cell printing technology using the piezoelectric nozzle, the different cells can be accurately printed on the surface of the scaffold that provided and analyzed more information of the interaction between different cells on the material. We believe that this method may serve as a useful and effective approach for the regeneration of defective complex hard tissues in deep bone structures.

scholarly journals Three dimensional ink-jet printing of biomaterials using ionic liquids and co-solvents

2016 ◽  
Vol 190 ◽  
pp. 509-523 ◽  
Author(s):  
Deshani H. A. T. Gunasekera ◽  
SzeLee Kuek ◽  
Denis Hasanaj ◽  
Yinfeng He ◽  
Christopher Tuck ◽  
...  
Keyword(s):  
Structural Changes ◽  
Three Dimensional ◽  
Additive Manufacture ◽  
Cellulose Sample ◽  
White Light Interferometry ◽  
Ink Jet Printing ◽  
Manufacture Process ◽  
Ink Jet ◽  
Jet Printing ◽  
Scanning Electron

1-Ethyl-3-methylimidazolium acetate ([C2C1Im][OAc]) and 1-butyl-3-methylimidazolium acetate ([C4C1Im][OAc]) have been used as solvents for the dissolution and ink-jet printing of cellulose from 1.0 to 4.8 wt%, mixed with the co-solvents 1-butanol and DMSO. 1-Butanol and DMSO were used as rheological modifiers to ensure consistent printing, with DMSO in the range of 41–47 wt% producing samples within the printable range of a DIMATIX print-head used (printability parameter < 10) at 55 °C, whilst maintaining cellulose solubility. Regeneration of cellulose from printed samples using water was demonstrated, with the resulting structural changes to the cellulose sample assessed by scanning electron microscopy (SEM) and white light interferometry (WLI). These results indicate the potential of biorenewable materials to be used in the 3D additive manufacture process to generate single-component and composite materials.

Multiphoton fabrication of functional three-dimensional structures

2003 ◽  
Author(s):  
Tommaso Baldacchini ◽  
Christopher LaFratta ◽  
Richard A. Farrer ◽  
John T. Fourkas ◽  
Zeynel Bayindir ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Multiphoton Fabrication

A two-photon active chevron-shaped type I photoinitiator designed for 3D stereolithography

2019 ◽  
Vol 55 (44) ◽  
pp. 6233-6236 ◽  
Author(s):  
Ruchun Zhou ◽  
Jean-Pierre Malval ◽  
Ming Jin ◽  
Arnaud Spangenberg ◽  
Haiyan Pan ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Type I ◽  
Two Photon ◽  
Multiphoton Fabrication

A highly reactive two-photon cleavable initiator with a chevron-shaped architecture has been designed which presents very promising performances for three-dimensional multiphoton fabrication.

Oscillating Wire Arc Additive Manufacture of Rocket Motor Bimetallic Conical Shell

2021 ◽  
Author(s):  
Tianying He ◽  
Shengfu Yu ◽  
RunZhen Yu ◽  
Bo Zheng
Keyword(s):  
Conical Shell ◽  
Molten Pool ◽  
Three Dimensional ◽  
Travel Speed ◽  
Rocket Motor ◽  
Dynamic Strain ◽  
Additive Manufacture ◽  
Forming Process ◽  
Forming Accuracy ◽  
Deposited Metal

Abstract This paper studies the temperature field, dynamic strain and forming accuracy of the Oscillate-WAAM conical shell in the forming process and manufactures the WAAM conical shell part. The results show that compared with the offset filling WAAM, the oscillate-WAAM conical shell shows the following characteristics：the temperature difference value between the inner and outer walls of the shell is significantly reduced, the cooling rate doubled decreased, the interlayer temperature is above 300°C, as well as the average temperature gradient, the dynamic strain stability value and deformation are reduced by about 50%. Under the same process parameters, the travel speed of Oscillate-WAAM is low, which increased the heat input large and the interlayer temperature high. Meanwhile, the molten pool of Oscillate-WAAM is in consistent with the width of the shell. The molten pool simultaneous solidifying changes the stress state of printed shell form three-dimensional to two-dimensional. All above are conductive to stress release, and reduce the strain and deformation of components. The bimetallic rocket motor shell composed of HS600 and HS950 is manufactured by oscillate-WAAM. The section roundness of the shell is 0.31mm and the overall forming accuracy is ±0.625mm. The deposited metal in HS600 part of conical shell is composed of pearlite and pro-eutectoid ferrite. While the deposited metal of HS950 is composed of pearlite, acicular ferrite and bainite. The forming accuracy and mechanical properties of conical shell formed by Oscillate-WAAM meet the requirements.

scholarly journals Fabrication of three dimensional layered vertically aligned carbon nanotube structures and their potential applications

RSC Advances ◽  
2015 ◽  
Vol 5 (126) ◽  
pp. 104458-104466 ◽  
Author(s):  
J. D. Beard ◽  
K. E. Evans ◽  
O. R. Ghita
Keyword(s):  
Carbon Nanotube ◽  
Three Dimensional ◽  
Additive Manufacture ◽  
Nanoelectronic Devices ◽  
Potential Applications ◽  
Vertically Aligned ◽  
Nanotube Growth ◽  
Nanocomposite Structures

Repeated deposition of catalyst and nanotube growth allows fabrication of multilayer nanotube forests, which can be patterned using shadow masks, with application to nanoelectronic devices, nanocomposite structures and additive manufacture.

Development and surgical application of a custom implant that enables a vertical vector of mandibular distraction

2020 ◽  
Vol 234 (10) ◽  
pp. 1172-1180
Author(s):  
Alba Gonzalez Alvarez ◽  
Lawrence Dovgalski ◽  
Peter Ll. Evans ◽  
Steven Key
Keyword(s):  
Distraction Osteogenesis ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
Inferior Alveolar Nerve ◽  
Facial Asymmetry ◽  
Titanium Implant ◽  
Additive Manufacture ◽  
Hemifacial Microsomia ◽  
Vertical Vector ◽  
Surgical Guides

Hemifacial microsomia is a congenital malformation that involves the underdevelopment of the mandible and the ear leading to facial asymmetry. Distraction osteogenesis is the gold standard surgical procedure for severe cases of hemifacial microsomia in which two sectioned bone parts are lengthened gradually to promote bony infill. The final shape of the bone depends on the position of the distractor and the vector of distraction. This article presents a complex clinical case of a 7-year-old patient with severe hemifacial microsomia that required distraction to correct mandibular asymmetry. Digital technology was applied to virtually plan the surgery pre-operatively. Optimal symmetrisation required a vertical vector of distraction that none of the ‘off-the-shelf’ distractors could provide. Consequently, a three-dimensional printed titanium implant was designed as a spacer to be attached to the inferior plate of a standard distractor, allowing the achievement of a vertical vector. By adding the spacer, the inferior footplate of the distractor was not directly fixed to bone and the vector of distraction was not dictated by the anatomical contour of the patient but by the shape of the spacer. Surgical guides were created to translate the virtual plan to the operating room. The guides prevented potential damage to tooth buds and the inferior alveolar nerve. This article describes the three-dimensional computer-aided design and additive manufacture of the custom devices that delivered the following: (1) symmetrisation of the mandible after distraction surgery without manipulation of the healthy side of the mandible; (2) a feasible and safer surgical solution; and (3) an innovative method that enables a wider range of vectors of distraction, bringing new prospects to the treatment of distraction osteogenesis in the future.

A Research of Design the Control System of 3D Printer by Fused Deposition Modeling (FDM) Technology

2020 ◽  
Vol 902 ◽  
pp. 65-70
Author(s):  
Thanh Nam Nguyen ◽  
Tuyen Vo ◽  
Minh Tam Nguyen ◽  
Tu Nguyen Thanh
Keyword(s):  
Control System ◽  
Fused Deposition Modeling ◽  
Design Method ◽  
Three Dimensional ◽  
Additive Manufacture ◽  
3D Printer ◽  
Material Technology ◽  
Fused Deposition ◽  
Deposition Modeling ◽  
Individual Scale

Nowadays, 3D printing technology or Additive Manufacture (AM) is becoming more and more popular in industries and life. Additive Material technology is a technology of linking or crystallizing materials under the control of a computer to create three-dimensional details. Additive Manufacture Technology currently consists of many different methods, in which the method of extruding molten materials through the nozzle called Fused Deposition Modeling (FDM) is the most popular. Almost all 3D printer machines that use this method are now very popular in the market, with the ability to work suitable for many types of objects, from individual scale to company one. However, the design and manufacture of these machines are carried out according to traditional methods, with many limitations. The paper presents an application of selective design method for FDM technology analysis results according to the module in [5] to implement the control system design of FDM to reduce costs and improve the reliability of the product.

scholarly journals Considerations Using Additive Manufacture of Emulsion Inks to Produce Respiratory Protective Filters Against Viral Respiratory Tract Infections Such as the COVID-19 Virus

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Colin Sherborne ◽  
Frederik Claeyssens
Keyword(s):  
3D Printing ◽  
Respiratory Tract ◽  
Bacterial Infections ◽  
Three Dimensional ◽  
Additive Manufacture ◽  
Protective Equipment ◽  
Internal Phase ◽  
Care Workers ◽  
Tract Infections ◽  
Emulsion Templating

This review paper explores the potential of combining emulsion-based inks with additive manufacturing (AM) to produce filters for respiratory protective equipment (RPE) in the fight against viral and bacterial infections of the respiratory tract. The value of these filters has been highlighted by the current severe acute respiratory syndrome coronavirus-2 crisis where the importance of protective equipment for health care workers cannot be overstated. Three-dimensional (3D) printing of emulsions is an emerging technology built on a well-established field of emulsion templating to produce porous materials such as polymerized high internal phase emulsions (polyHIPEs). PolyHIPE-based porous polymers have tailorable porosity from the submicron to 100 s of μm. Advances in 3D printing technology enables the control of the bulk shape while a micron porosity is controlled independently by the emulsion-based ink. Herein, we present an overview of the current polyHIPE-based filter applications. Then, we discuss the current use of emulsion templating combined with stereolithography and extrusion-based AM technologies. The benefits and limitation of various AM techniques are discussed, as well as considerations for a scalable manufacture of a polyHIPE-based RPE.

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