Partially Cured Photopolymer with Gradient Bingham Plastic Behaviors as a Versatile Deformable Material

Kwak, Rhokyun; Park, Hyun Ha; Ko, Hangil; Seong, Minho; Kwak, Moon Kyu; Jeong, Hoon Eui

doi:10.1021/acsmacrolett.7b00233

Cited by 14 publications

(10 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More details on the sinusoidal texturing of NOA73 can be found in Methods. Note that even though the NOA73 thin film’s inner volume becomes well cured by the UV exposure 31 , a thin layer at its top surface remains fluidic and, hence, available for EHDL due to the oxygen-induced inhibition of photopolymerization 32 – 35 . When the tribocharged PDMS nanocup array was placed on the pre-textured NOA73 film (Fig.…”

Section: Resultsmentioning

confidence: 99%

Replica molding-based nanopatterning of tribocharge on elastomer with application to electrohydrodynamic nanolithography

Peer

Cho

et al. 2018

Nat Commun

View full text Add to dashboard Cite

Replica molding often induces tribocharge on elastomers. To date, this phenomenon has been studied only on untextured elastomer surfaces even though replica molding is an effective method for their nanotexturing. Here we show that on elastomer surfaces nanotextured through replica molding the induced tribocharge also becomes patterned at nanoscale in close correlation with the nanotexture. By applying Kelvin probe microscopy, electrohydrodynamic lithography, and electrostatic analysis to our model nanostructure, poly(dimethylsiloxane) nanocup arrays replicated from a polycarbonate nanocone array, we reveal that the induced tribocharge is highly localized within the nanocup, especially around its rim. Through finite element analysis, we also find that the rim sustains the strongest friction during the demolding process. From these findings, we identify the demolding-induced friction as the main factor governing the tribocharge’s nanoscale distribution pattern. By incorporating the resulting annular tribocharge into electrohydrodynamic lithography, we also accomplish facile realization of nanovolcanos with 10 nm-scale craters.

show abstract

Section: Resultsmentioning

confidence: 99%

Replica molding-based nanopatterning of tribocharge on elastomer with application to electrohydrodynamic nanolithography

Peer

Cho

et al. 2018

Nat Commun

View full text Add to dashboard Cite

show abstract

“…As shown, the 3D microstructure array was prepared by a simple replica molding technique using PUA as a base material. PUA is a UV-curable polymer that can be rapidly cured within a few seconds by UV irradiation [18]. Therefore, various 3D, complicated micro-or nanoscale structures can be simply generated with PUA in a highly precise and rapid manner [15].…”

Section: Adhesion Measurementsmentioning

confidence: 99%

Strong and Reversible Adhesion of Interlocked 3D-Microarchitectures

et al. 2019

Self Cite

View full text Add to dashboard Cite

Diverse physical interlocking devices have recently been developed based on one-dimensional (1D), high-aspect-ratio inorganic and organic nanomaterials. Although these 1D nanomaterial-based interlocking devices can provide reliable and repeatable shear adhesion, their adhesion in the normal direction is typically very weak. In addition, the high-aspect-ratio, slender structures are mechanically less durable. In this study, we demonstrate a highly flexible and robust interlocking system that exhibits strong and reversible adhesion based on physical interlocking between three-dimensional (3D) microscale architectures. The 3D microstructures have protruding tips on their cylindrical stems, which enable tight mechanical binding between the microstructures. Based on the unique 3D architectures, the interlocking adhesives exhibit remarkable adhesion strengths in both the normal and shear directions. In addition, their adhesion is highly reversible due to the robust mechanical and structural stability of the microstructures. An analytical model is proposed to explain the measured adhesion behavior, which is in good agreement with the experimental results.

show abstract

“…Therefore, there are few photosensitive resins that can be used for 3D printing. Furthermore, most of them are initiated by free radicals [ 17 ], which will lead to the hybrid resins being hard and brittle after curing, resulting in poor bending and stretching properties, severely limiting the range of application [ 18 , 19 ]. Used as the diluent of acrylic resin, N-acryloyl-morpholine (ACMO) is very stable with typically low irritative, corrosive, and toxic properties.…”

Section: Introductionmentioning

confidence: 99%

Design and Synthesis of Free-Radical/Cationic Photosensitive Resin Applied for 3D Printer with Liquid Crystal Display (LCD) Irradiation

et al. 2020

View full text Add to dashboard Cite

In this work, aiming at a UV-curing 3D printing process with liquid crystal display (LCD) irradiation, a novel free-radical/cationic hybrid photosensitive resin was designed and prepared. After testing, the results showed that the acrylate monomers could be polymerized through a free-radical mechanism, while the epoxides were polymerized by a cationic curing mechanism. During the process of UV-curing, the acrylate and epoxide polymers were crosslinked and further locked together by non-covalent bonds. Therefore, an interpenetrating polymer network (IPN) structure could be formed through light-curing 3D-printing processes. Fourier transform infrared spectroscopy (FT-IR) revealed that the 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexyl formate and acrylic resin were both successfully involved in the UV-curing process. Furthermore, in order to make the 3D-printed objects cured completely, post-processing was of great importance. The results from the systematic study of the dynamic mechanical properties of the printed objects showed that the heating treatment process after UV irradiation was very necessary and favorable for the complete cationic polymerization of UV-6110 induced by Irgacure 261. The optimum heating treatment conditions were achieved at a temperature of 70 °C for 3 h.

show abstract

Partially Cured Photopolymer with Gradient Bingham Plastic Behaviors as a Versatile Deformable Material

Cited by 14 publications

References 34 publications

Replica molding-based nanopatterning of tribocharge on elastomer with application to electrohydrodynamic nanolithography

Replica molding-based nanopatterning of tribocharge on elastomer with application to electrohydrodynamic nanolithography

Strong and Reversible Adhesion of Interlocked 3D-Microarchitectures

Design and Synthesis of Free-Radical/Cationic Photosensitive Resin Applied for 3D Printer with Liquid Crystal Display (LCD) Irradiation

Contact Info

Product

Resources

About