Modeling the replication of submicron-structured surfaces by micro injection molding

Piccolo, Leonardo; Puleo, Kyle; Sorgato, Marco; Lucchetta, Giovanni; Masato, Davide

doi:10.1016/j.matdes.2020.109272

Cited by 17 publications

(18 citation statements)

References 36 publications

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“…Understanding and controlling the phase transformation involved in cooling and heating processes is the key to designing the material properties, as the degree of crystallinity and crystallization behavior determine most physicochemical features. For numerous high-speed industrial nonisothermal processes such as three-dimensional (3D) printing, injection molding, and blow molding, the crystallization rates determine the general utility of materials. − In pharmaceutical and metal sciences, continuous temperature-time-transformation studies are of great importance for establishing solidification tendencies. The phase transition behavior is described through continuous cooling and continuous heating transition (CCT and CHT) diagrams for practical reasons in these fields.…”

Section: Introductionmentioning

confidence: 99%

Interplay between Melt and Cold Crystallization in a Smectic Liquid Crystal, 4-Pentylphenyl 4-(trans-4-Pentylcyclohexyl)benzoate

Rozwadowski

Yamamura

Saito

2021

Crystal Growth & Design

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In this study, we apply differential scanning calorimetry (DSC) and polarizing microscopy (POM) to elucidate the interplay of crystallization mechanisms controlling the tendency for melt and cold crystallization from the partially ordered smectic B phase in 4-pentylphenyl 4-(trans-4-pentylcyclohexyl)benzoate (5CPB5) mesogen. For this purpose, we pay attention to the kinetics of nonisothermal crystallization revealed by several complementary approaches, including Ozawa, Mo, and the isoconversional method. Additionally, we adopt the Hoffman–Lauritzen theory for analyzing the temperature dependence of crystallization activation energy, allowing us to describe the multistep crystallization of the smectic B mesophase. Our investigation shows the possibility of designing the mechanism controlling the different crystallization paths. Moreover, we demonstrate the ability to switch the dimensionality of crystal growth by modifying the dominance of molecular mobility through the experimental rate.

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Section: Introductionmentioning

confidence: 99%

Interplay between Melt and Cold Crystallization in a Smectic Liquid Crystal, 4-Pentylphenyl 4-(trans-4-Pentylcyclohexyl)benzoate

Rozwadowski

Yamamura

Saito

2021

Crystal Growth & Design

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“…The micro-injection process is currently one of the most important technologies for preparing polymeric micro-device due to low manufacturing cost, high precision, short molding cycle and the ability to prepare complex parts ( Figures 5A,B ) ( Wang, 2019 ; Piccolo et al, 2021 ). Although similar with traditional injection molding process, the melt in micro-injection can be described as an ideal case of laminar flow, the shear in the micro confined channel is significantly greater than that of the traditional injection molding process ( Jiang et al, 2018 ).…”

Section: Micro Injection Moldingmentioning

confidence: 99%

Current Advances and Future Perspectives of Advanced Polymer Processing for Bone and Tissue Engineering: Morphological Control and Applications

Zhang

Nie

2022

Front. Bioeng. Biotechnol.

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Advanced polymer processing has received extensive attention due to its unique control of complex force fields and customizability, and has been widely applied in various fields, especially in preparation of functional devices for bioengineering and biotechnology. This review aims to provide an overview of various advanced polymer processing techniques including rotation extrusion, electrospinning, micro injection molding, 3D printing and their recent progresses in the field of cell proliferation, bone repair, and artificial blood vessels. This review dose not only attempts to provide a comprehensive understanding of advanced polymer processing, but also aims to guide for design and fabrication of next-generation device for biomedical engineering.

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“…Micro-and nanostructures are increasingly attracting new attention for their unique capability of tailoring the surface properties of materials in different applications [1][2][3][4][5]. The development of functional surfaces is enabled by developing novel structures and pattern configurations.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Laser Texturing of Stainless Steel in Water and Air Environment

Piccolo

Wang

Lucchetta

et al. 2022

Lasers Manuf. Mater. Process.

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Ultrafast laser texturing allows the generation of micro- and nanostructures on steel substrates. Laser-ablated textures show a wide range of structure geometries, from the micro to the nanoscale, which can enable plastic product functionalization. Polymer processing technologies are used to replicate mold textures on a large manufacturing scale. To enable new product functionalities, developing novel texture geometries is critical. The laser-ablated texture dimensions are primarily linked to the laser light properties, such as the laser wavelength, thus limiting the achievable structure shapes. This work uses ultrafast laser to manufacture textures in air and water environments. The effect of the different mediums on structures formation is characterized. The irradiation is performed over a wide range of fluence values. The texture geometry and characteristics are evaluated by scanning electron microscopy. For decreasing fluence values, the structures transitioned from micro bumps, to LIPSS, to nanostructures, regardless of the irradiation environment. Conversely, structure morphology is affected by the irradiation environment. The LIPSS pitch is lower for the underwater environment due to the change in the laser angle of incidence, which changes with the refraction index ratio of the air and water. A novel nano-lamellae texture was generated when irradiating the steel surface underwater at relatively low fluence. The dynamics of different LIPSS generations are discussed, considering the irradiation medium’s optical, thermal, and physical properties.

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Modeling the replication of submicron-structured surfaces by micro injection molding

Cited by 17 publications

References 36 publications

Interplay between Melt and Cold Crystallization in a Smectic Liquid Crystal, 4-Pentylphenyl 4-(trans-4-Pentylcyclohexyl)benzoate

Interplay between Melt and Cold Crystallization in a Smectic Liquid Crystal, 4-Pentylphenyl 4-(trans-4-Pentylcyclohexyl)benzoate

Current Advances and Future Perspectives of Advanced Polymer Processing for Bone and Tissue Engineering: Morphological Control and Applications

Ultrafast Laser Texturing of Stainless Steel in Water and Air Environment

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