scholarly journals Three-dimensional highly conductive silver nanowires sponges based on cotton-templated porous structures for stretchable conductors

RSC Advances ◽  
2017 ◽  
Vol 7 (1) ◽  
pp. 51-57 ◽  
Author(s):  
Chun-Hua Zhu ◽  
Li-Ming Li ◽  
Jian-Hua Wang ◽  
Ye-Ping Wu ◽  
Yu Liu
Keyword(s):  
Mechanical Properties ◽  
Porous Structure ◽  
Silver Nanowires ◽  
Three Dimensional ◽  
Porous Structures ◽  
Binary Structure ◽  
Stretchable Conductors ◽  
Stretchable Conductor

A stretchable conductor was explored by embedding a binary structure fabricated from an interconnected porous structure of cotton as skeleton along with supported 2D AgNWs network into PDMS, which showed excellent electrical and mechanical properties.

Highly Glycerin-Loaded Natural Rubber Films Prepared by Casting Technique Using Different Solvents

2013 ◽  
Vol 844 ◽  
pp. 190-193 ◽  
Author(s):  
Pongsathorn Issarayungyuen ◽  
Wiwat Pichayakorn ◽  
Thawatchai Phaechamud
Keyword(s):  
Mechanical Properties ◽  
Drug Delivery ◽  
Tensile Strength ◽  
Natural Rubber ◽  
Porous Structure ◽  
Diethyl Ether ◽  
Drug Delivery Systems ◽  
Controlled Drug Delivery ◽  
Porous Structures ◽  
Casting Technique

The highly glycerin-loaded natural rubber (NR) films were fabricated by casting technique with different solvents including dichloromethane (DCM), diethyl ether and tetrahydrofuran (THF) with an addition of 75 phr glycerin. Their mechanical properties, wettability and topography were determined. The highly glycerin-loaded NR films exhibited the continuous porous structure which their tensile strength values decreased whereas their wettability was enhanced. Pore size of the glycerin-loaded NR films prepared by using DCM as a solvent was greatly larger than those of the systems prepared by using diethyl ether and THF, respectively. Some active compounds might be loaded into these modified porous structures of NR films and applied for controlled drug delivery systems.

scholarly journals Post-Processing Treatment Impact on Mechanical Properties of SLM Deposited Ti-6Al-4 V Porous Structure for Biomedical Application

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5167
Author(s):  
Eren Pehlivan ◽  
Jan Džugan ◽  
Jaroslav Fojt ◽  
Radek Sedláček ◽  
Sylwia Rzepa ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Porous Structure ◽  
Structural Damage ◽  
Biomedical Application ◽  
Hot Isostatic Pressing ◽  
Minor Effect ◽  
Porous Structures ◽  
Compression Tests ◽  
Strut Thickness ◽  
Surface Etching

Additive manufacturing technologies allow producing a regular three-dimensional mesh of interconnected struts that form an open-cell porous structure. Regular porous structures have been used in the orthopedic industry due to outstanding bone anchoring. The aim of the study was to determine how the postprocessing influences the mechanical properties of porous structures made of titanium alloy CL 41TI ELI. The effect of hot isostatic pressing (HIP) as a method of increasing microstructural integrity was investigated here. The influence of surface etching (SE) technique, which was applied to the porous structure for cleaning unmelted titanium powder particles on the surface of connectors from the inner surfaces of a porous structure, was examined in this study. Mechanical properties were investigated by means of compression tests. The results point out that HIP has a minor effect on the mechanical behavior of considered porous structures. The SE is an effective method to clean the surface of a porous structure, which is very important in the case of biomedical applications when loose powder can cause serious health problems. Another effect of the SE is also the strut thickness reduction. Reducing strut thickness of a porous structure with the surface etching decreases its stiffness to the same extent as predicted by the relative density theoretical model but did not result in structural damage.

Mechanical properties of multi-materials porous structures based on triply periodic minimal surface fabricated by additive manufacturing

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mingkang Zhang ◽  
Yongqiang Yang ◽  
Meizhen Xu ◽  
Jie Chen ◽  
Di Wang
Keyword(s):  
Mechanical Properties ◽  
Porous Structure ◽  
Plastic Material ◽  
Porous Structures ◽  
Compression Force ◽  
Content Type ◽  
Periodic Minimal Surface ◽  
Triply Periodic ◽  
Force Direction ◽  
Triply Periodic Minimal Surface

Purpose The purpose of this study is focused on the mechanical properties of multi-materials porous structures manufactured by selective laser melting (SLM). Design/methodology/approach The Diamond structure was designed by the triply periodic minimal surface function in MATLAB, and multi-materials porous structures were manufactured by SLM. Compression tests were applied to analyze the anisotropy of mechanical properties of multi-materials porous structures. Findings Compression results show that the multi-materials porous structure has a strong anisotropy behavior. When the compression force direction is parallel to the material arrangement, multi-materials porous structure was compressed in a layer-by-layer way, which is the traditional deformation of the gradient structure. However, when the compression force direction is perpendicular to the material arrangement, the compression curves show a near-periodic saw-tooth waveform characteristic, and this kind of structure was compressed consistently. It is demonstrated that the combination with high strength brittle material and low strength plastic material improves compression mode, and plastic material plays a role in buffering fracture. Originality/value This research provides a new method for the design and manufacturing of multi-materials porous structures and an approach to change the compression behavior of the porous structure.

Fabrication of Functionally Porous Structures by the Sheet Lamination Method

2007 ◽  
Vol 561-565 ◽  
pp. 1711-1714 ◽  
Author(s):  
K. Yamasaki ◽  
S. Fukuda ◽  
Takashi Murakami ◽  
K. Maekawa
Keyword(s):  
Porous Structure ◽  
Cross Sections ◽  
Fractal Structure ◽  
Three Dimensional ◽  
Tissue Growth ◽  
Porous Structures ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Recent Trends ◽  
Materials Used

Recent trends in bio technology have resulted in the need for accurate fabrication of pore structure of sophisticated porous materials used in advanced applications such as substrates for tissue growth, and various kinds of implants. Control of pore size is important for promoting growth of blood vessels and adequate fluid flow. In the present study, an attempt has been made to fabricate functionally porous structures using titanium, including an internally controlled three-dimensional (3-D) fractal structure. A novel 3-D modeling method that combines rapid prototyping with spark plasma sintering (SPS) is proposed, which enables us to control the internal porous structure. Titanium powder-tape or sheet is sintered or cut by a pulsed Nd:YAG laser to form 2-D fractal cross-sections. These 2-D layers are temporarily laminated in a carbon mold, being then jointed by the SPS method to maintain the internal porous structure. Process parameters for the sheet lamination method have extensively been investigated.

scholarly journals The influence of supercritical foaming conditions on properties of polymer scaffolds for tissue engineering

2017 ◽  
Vol 38 (4) ◽  
pp. 535-541 ◽  
Author(s):  
Katarzyna Kosowska ◽  
Marek Henczka
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Process Parameters ◽  
Three Dimensional ◽  
Experimental Investigations ◽  
Porous Structures ◽  
Static Compression ◽  
Precise Control ◽  
Foaming Process ◽  
Supercritical Foaming

Abstract The results of experimental investigations into foaming process of poly(ε-caprolactone) using supercritical CO2 are presented. The objective of the study was to explore the aspects of fabrication of biodegradable and biocompatible scaffolds that can be applied as a temporary three-dimensional extracellular matrix analog for cells to grow into a new tissue. The influence of foaming process parameters, which have been proven previously to affect significantly scaffold bioactivity, such as pressure (8-18 MPa), temperature (323-373 K) and time of saturation (1-6 h) on microstructure and mechanical properties of produced polymer porous structures is presented. The morphology and mechanical properties of considered materials were analyzed using a scanning electron microscope (SEM), x-ray microtomography (μ-CT) and a static compression test. A precise control over porosity and morphology of obtained polymer porous structures by adjusting the foaming process parameters has been proved. The obtained poly(ε-caprolactone) solid foams prepared using scCO2 have demonstrated sufficient mechanical strength to be applied as scaffolds in tissue engineering.

An assessment of thermosetting infiltrate in powder-based composites made by additive manufacturing

2018 ◽  
Vol 53 (7) ◽  
pp. 873-882 ◽  
Author(s):  
Breno Ferreira Lizardo ◽  
Luciano Machado Gomes Vieira ◽  
Juan Carlos Campos Rubio ◽  
Tulio Hallak Panzera ◽  
João Paulo Davim
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Porous Structure ◽  
Epoxy Polymer ◽  
Complex Geometry ◽  
Microstructural Analysis ◽  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Small Series ◽  
Dimensional Printing

Rapid prototyping for material deposition or additive manufacturing has been widely used for short time production of parts with complex geometry in small series. The three-dimensional printing process needs post-processing to improve the strength, stiffness and/or surface finish of the parts. Printed parts in pristine condition are generally very brittle with a porous structure, so infiltrates have been introduced to improve their mechanical and physical characteristics. This work investigates the effect of two infiltrates, epoxy polymer and cyanoacrylate, under a vacuum pressure system on the mechanical properties of powder-based composites made by three-dimensional printing. Samples printed under pristine and infiltrated conditions were tested under tensile, flexural, compressive and impact loadings. The infiltrated samples achieved superior mechanical properties, especially when the epoxy polymer was applied via a vacuum system. The microstructural analysis showed that the infiltrates were not able to penetrate the entire sample, revealing a porous structure in the centre, mainly when the cyanoacrylate was used. The epoxy polymer infiltrate was able to substantially increase the mechanical performance of three-dimensional samples, being a promising material when higher structural requirements are required.

scholarly journals Effect of Viscosity on the Formation of Porous Polydimethylsiloxane for Wearable Device Applications

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1471
Author(s):  
Dong-Hyun Baek ◽  
Hachul Jung ◽  
Jeong Hun Kim ◽  
Young Wook Park ◽  
Dae Wook Kim ◽  
...  
Keyword(s):  
Porous Structure ◽  
Three Dimensional ◽  
Cost Effective ◽  
Soft Materials ◽  
Wearable Devices ◽  
Porous Structures ◽  
Relative Resistance ◽  
Patch Type ◽  
Device Applications ◽  
Initial Resistance

Medical devices, which enhance the quality of life, have experienced a gradual increase in demand. Various research groups have attempted to incorporate soft materials such as skin into wearable devices. We developed a stretchable substrate with high elasticity by forming a porous structure on polydimethylsiloxane (PDMS). To optimize the porous structure, we propose a manufacturing process that utilizes a high-pressure steam with different viscosities (400, 800, 2100, and 3000 cP) of an uncured PDMS solution. The proposed method simplifies the manufacturing of porous structures and is cost-effective compared to other technologies. Porous structures of various viscosities were formed, and their electrical and mechanical properties evaluated. Porous PDMS (3000 cP) was formed in a sponge-like three-dimensional porous structure, compared to PDMS formed by other viscosities. The elongation of porous PDMS (3000 cP) was increased by up to 30%, and the relative resistance changed to less than 1000 times with the maximum strain test. The relative resistance increased the initial resistance (R0) by approximately 10 times during the 1500-times repeated cycling tests with 30% strain. As a result, patch-type wearable devices based on soft materials can provide an innovative platform that can connect with the human skin for robotics applications and for continuous health monitoring.

Biotemplated facile synthesis of three‐dimensional micro/nanoporous tin oxide: improving the flammable and mechanical properties of flexible PVC

2019 ◽  
Vol 14 (8) ◽  
pp. 828-830 ◽  
Author(s):  
Weihua Meng ◽  
Weihong Wu ◽  
Weiwei Zhang ◽  
Luyao Cheng ◽  
Yunhong Jiao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tin Oxide ◽  
Three Dimensional ◽  
Facile Synthesis
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