High-performance 3D printing of hydrogels by water-dispersible photoinitiator nanoparticles

Pawar, Amol Ashok; Saada, Gabriel; Cooperstein, Ido; Larush, Liraz; Jackman, Joshua A.; Tabaei, Seyed R.; Cho, Nam‐Joon; Magdassi, Shlomo

doi:10.1126/sciadv.1501381

Cited by 226 publications

(158 citation statements)

References 62 publications

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“…An alternative photoinitiator is phenylbis(2,4,6-trimethylbenzoyl) phosphine oxide (TPO), which exhibits significant absorbance in the l = 385 to 420 nm wavelength range and high molar extinction coefficients. 29 TPO is commonly used in photocurable resins because of the overlap between its absorbance spectrum and the emission wavelength of the near-UV light sources in 3D printing. We find that adding 0.1 g mL À1 of TPO in a 2 vol% co-solvent of butyl acetate provides the best balance between solubility, nanoemulsion stability and photocurability.…”

Section: Methodsmentioning

confidence: 99%

3D printing of self-assembling thermoresponsive nanoemulsions into hierarchical mesostructured hydrogels

et al. 2017

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Spinodal decomposition and phase transitions have emerged as viable methods to generate a variety of bicontinuous materials. Here, we show that when arrested phase separation is coupled to the time scales involved in three-dimensional (3D) printing processes, hydrogels with multiple length scales spanning nanometers to millimeters can be printed with high fidelity. We use an oil-in-water nanoemulsion-based ink with rheological and photoreactive properties that satisfy the requirements of stereolithographic 3D printing. This ink is thermoresponsive and consists of poly(dimethyl siloxane) droplets suspended in an aqueous phase containing the surfactant sodium dodecyl sulfate and the cross-linker poly(ethylene glycol) dimethacrylate. Control of the hydrogel microstructure can be achieved in the printing process due to the rapid structural recovery of the nanoemulsions after large strain-rate yielding, as well as the shear thinning behavior that allows the ink to conform to the build platform of the printer. Wiper operations are used to ensure even spreading of the yield stress ink on the optical window between successive print steps. Post-processing of the printed samples is used to generate mesoporous hydrogels that serve as size-selective membranes. Our work demonstrates that nanoemulsions, which belong to a class of solution-based materials with flexible functionalities, can be printed into prototypes with complex shapes using a commercially available 3D printer with a few modifications.

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Section: Methodsmentioning

confidence: 99%

3D printing of self-assembling thermoresponsive nanoemulsions into hierarchical mesostructured hydrogels

et al. 2017

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“…In particular, DLP-type 3D printing allows high resolutions in the X-Y plane and Z-axis [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. A variety of polymers, including acrylonitrile-butadiene-styrene (ABS) resin [1], silicone rubber [4], acrylic resin [5][6][7], polycaprolactone (PCL) [8], polyimide (PI) [9], polyvinylpyrrolidone (PVP) [10], and polyurethane (PU) [11,12], were used as materials for 3D printing. Stretchable silicone elastomer, with 1100% of strain at a break point, was realized by the DLP-type 3D printing of silicone paste has a density of 25 mg/mL, and the average thickness and lateral size of the GS are about < 5 nm and 2-3 µm, respectively.…”

Section: Introductionmentioning

confidence: 99%

Comparative Studies on Polyurethane Composites Filled with Polyaniline and Graphene for DLP-Type 3D Printing

Joo

Cho

2020

Polymers

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Digital light processing (DLP)-type 3D printing ensures several advantages, such as an easy solution process, a short printing time, high-quality printing, and selective light curing. Furthermore, polyurethane (PU) is among the promising candidates for 3D printing because of its wide range of applications. This work reports comparative studies on the fabrication and optimization of PU composites using a polyaniline (PANI) nanomaterial and a graphene sheet (GS) for DLP-type 3D printing. The morphologies and dispersion of the printed PU composites were studied by field emission scanning electron microscope (FE-SEM) images. Bonding structures in the PU composites were investigated by Fourier-transform infrared (FT-IR) spectroscopy. As-prepared PU/PANI and PU/GS composites with different filler contents were successfully printed into sculptures with different sizes and shapes. The PU/PANI and PU/GS composites exhibit the improved sheet resistance, which is up to 8.57 × 104 times (1.19 × 106 ohm/sq) lower and 1.27 × 105 times (8.05 × 105 ohm/sq) lower, respectively, than the pristine PU (1.02 × 1011 ohm/sq). Moreover, the PU/PANI and PU/GS composites demonstrate 1.41 times (44.5 MPa) higher and 2.19 times (69.3 MPa) higher tensile strengths compared with the pristine PU (31.6 MPa). This work suggests the potential uses of highly conductive PU composites for DLP-type 3D printing.

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“…[ 93 ] Larush and co‐workers used polymerizable inks that were composed of water, acrylic acid monomer, polyethylene glycol diacrylate as a crosslinker, and a water dispersible photoinitiator composed of nanoparticles of (2,4,6‐ trimethylbenzoyl‐diphenylphosphine oxide (TPO). [ 94 ] The use of photoinitiator nanoparticles opened the way for printing objects in water with a high resolution by SLA technologies. The printed structures exhibited a strong pH‐responsive swelling, e.g., increase in volume at high pH and shrinkage at low pH.…”

Section: Stimuli‐responsive Hydrogelsmentioning

confidence: 99%

4D Printed Hydrogels: Fabrication, Materials, and Applications

Dong

Wang

et al. 2020

Adv Materials Technologies

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107

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High-performance 3D printing of hydrogels by water-dispersible photoinitiator nanoparticles

Abstract: Photoinitiator nanoparticles enable rapid 3D printing of hydrogels from waterborne systems using digital light printers.

Cited by 226 publications

References 62 publications

3D printing of self-assembling thermoresponsive nanoemulsions into hierarchical mesostructured hydrogels

3D printing of self-assembling thermoresponsive nanoemulsions into hierarchical mesostructured hydrogels

Comparative Studies on Polyurethane Composites Filled with Polyaniline and Graphene for DLP-Type 3D Printing

4D Printed Hydrogels: Fabrication, Materials, and Applications

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