Investigation of Contact Angles and Surface Morphology of 3D-Printed Materials

Neukäufer, Johannes; Seyfang, Bernhard C.; Grützner, Thomas

doi:10.1021/acs.iecr.0c00430

Cited by 21 publications

(17 citation statements)

References 48 publications

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“…There are relatively few publications regarding the wettability of additively manufactured materials. Depending on the production process as well as on the chemical composition, specifically the effect of additives, materials can differ in their surface morphology and consequently in their CAs [ 58 ]. The influence of lignin on the average water contact angles of printed composites is displayed in Figure 6 .…”

Section: Resultsmentioning

confidence: 99%

Lignin as a High-Value Bioaditive in 3D-DLP Printable Acrylic Resins and Polyaniline Conductive Composite

et al. 2022

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With increasing environmental awareness, lignin will play a key role in the transition from the traditional materials industry towards sustainability and Industry 4.0, boosting the development of functional eco-friendly composites for future electronic devices. In this work, a detailed study of the effect of unmodified lignin on 3D printed light-curable acrylic composites was performed up to 4 wt.%. Lignin ratios below 3 wt.% could be easily and reproducibly printed on a digital light processing (DLP) printer, maintaining the flexibility and thermal stability of the pristine resin. These low lignin contents lead to 3D printed composites with smoother surfaces, improved hardness (Shore A increase ~5%), and higher wettability (contact angles decrease ~19.5%). Finally, 1 wt.% lignin was added into 3D printed acrylic resins containing 5 wt.% p-toluensulfonic doped polyaniline (pTSA-PANI). The lignin/pTSA-PANI/acrylic composite showed a clear improvement in the dispersion of the conductive filler, reducing the average surface roughness (Ra) by 61% and increasing the electrical conductivity by an order of magnitude (up to 10−6 S cm−1) compared to lignin free PANI composites. Thus, incorporating organosolv lignin from wood industry wastes as raw material into 3D printed photocurable resins represents a simple, low-cost potential application for the design of novel high-valued, bio-based products.

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Section: Resultsmentioning

confidence: 99%

Lignin as a High-Value Bioaditive in 3D-DLP Printable Acrylic Resins and Polyaniline Conductive Composite

et al. 2022

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“…The glass@epoxy durability can be drastically improved when immobilized with nanoparticles. − The focus of the current research was to prepare a transparent glass@epoxy with a smooth surface. Thus, tensile and scratch tests were conducted to assess the glass@epoxy mechanical characteristics.…”

Section: Resultsmentioning

confidence: 99%

“…The contact angle was analyzed using OCA 15 EC (Dataphysics, Stuttgart, Germany). 41 2.5.3. Mechanical Properties.…”

Section: Electrospinning and Silanizationmentioning

confidence: 99%

Preparation of Lighting in the Dark and Photochromic Electrospun Glass Nanofiber-Reinforced Epoxy Nanocomposites Immobilized with Alkaline Earth Aluminates

et al. 2022

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Alkaline earth aluminates (AEAs) as photoluminescent agents and silicon dioxide-based electrospun glass nanofibers with an average diameter of 150−450 nm as a roughening agent were prepared and applied to reinforce an epoxy resin toward the development of long-persistent photoluminescent and photochromic smart materials, such as smart windows and anticounterfeiting barcodes. With the physical immobilization of lanthanide-doped aluminate nanoparticles (NPs), a light-induced luminescent transparent glass@epoxy film was developed. The glass@epoxy samples were able to alter their color to green beneath ultraviolet rays and greenish-yellow in the dark, as explored by CIE Lab and luminescence spectral analyses. The morphology of the lanthanidedoped aluminate nanoparticles (43−98 nm) was examined by transmission electron microscopy (TEM). The morphologies and chemical composition of the luminescent glass@epoxy substrates were determined by different analytical techniques. The mechanical properties of the developed photoluminescent glass@epoxy substrates were inspected to show improved scratch resistance as compared to the AEA-free substrate. The photoluminescence spectra were measured to indicate the detection of two emission bands at 494 and 525 nm when excited at 365 nm. The photoluminescent glass@epoxy hybrids with lower AEA contents have showed fast reversibility of photochromism. On the other hand, the glass@epoxy substrates with higher phosphor contents underwent persistent luminescence. Results showed that the luminescent colorless glass@epoxy hybrids have enhanced superhydrophobicity and ultraviolet blocking.

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“…The investigation of the properties of 3D printed materials and their influence on the performance-relevant physical phenomena is also a research topic of the Thermal Process Engineering group at the Ulm University. 32 Depending on the exact 3D printing material specification, it has been observed that residuals of the powder can accumulate in the reboiler during column operation. For this reason, it is advisable to infiltrate the 3D printed column components.…”

Section: Additively Manufactured Componentsmentioning

confidence: 99%

“…In principle, it is not a problem to include column components made of other materials than polyamide, if desired. The investigation of the properties of 3D printed materials and their influence on the performance‐relevant physical phenomena is also a research topic of the Thermal Process Engineering group at the Ulm University 32 . Depending on the exact 3D printing material specification, it has been observed that residuals of the powder can accumulate in the reboiler during column operation.…”

Section: Distillation Test Rigmentioning

confidence: 99%

Flexible distillation test rig on a laboratory scale for characterization of additively manufactured packings

et al. 2021

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Additive manufacturing is increasingly being used to develop innovative packings for absorption and desorption columns. Since distillation has not been in focus so far, this article aims to fill this gap. The objective is to obtain a miniaturized three dimensional (3D) printed packed column with optimized properties in terms of scalability and reproducibility, which increases process development efficiency. For this purpose, a flexible laboratory scale test rig is presented combining standard laboratory equipment with 3D printed components such as innovative multifunctional trays or the column wall with packing. The test rig offers a particularly wide operating range F ¼ 0:15Pa 0:5 …1:0Pa 0:5 for column diameters between 2 and 50mm. First results regarding the time to reach steady-state, operational stability, and separation efficiency measurements are presented using a 3D printable version of the Rombopak 9M. Currently, further developed and newly designed packing structures are being characterized, which should exhibit optimized properties especially with respect to scalability and separation efficiency.

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Investigation of Contact Angles and Surface Morphology of 3D-Printed Materials

Cited by 21 publications

References 48 publications

Lignin as a High-Value Bioaditive in 3D-DLP Printable Acrylic Resins and Polyaniline Conductive Composite

Lignin as a High-Value Bioaditive in 3D-DLP Printable Acrylic Resins and Polyaniline Conductive Composite

Preparation of Lighting in the Dark and Photochromic Electrospun Glass Nanofiber-Reinforced Epoxy Nanocomposites Immobilized with Alkaline Earth Aluminates

Flexible distillation test rig on a laboratory scale for characterization of additively manufactured packings

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