Laser Interactions with Organic/Polymer Materials

Rebollar, Esther; Castillejo, Marta

doi:10.1007/978-3-030-63647-0_13

Cited by 3 publications

(4 citation statements)

References 268 publications

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“…showed a nonlinear dependence of ablation depth on the incident laser power for poly(methylmethacrylate), polystyrene, poly(butyl methacrylate), and poly[2‐(3‐thienyl)ethoxy‐4‐butylsulfonate]. [ 21 ] Given the reports on other polymer materials, [ 22–33 ] our result of a linear power dependence suggests that a unique mechanism is involved during ablation of CYTOP by femtosecond lasers. In the ablation experiments of Figure 1, we used two objective lenses for the three wavelengths, leading to three different diffraction‐limited spot sizes.…”

Section: Discussionmentioning

confidence: 59%

“…This behavior is contrary to that in cases discussed in previous reports related to multiphoton laser ablation of polymers. [22][23][24][25][26][27][28][29][30][31][32][33] Second, the frag-CYTOPs have a far larger absorption coefficient than the original CYTOP; the volume of the frag-CYTOPs therefore increases more effectively as a result of further laser pulses. This volume change functions as positive feedback for frag-CYTOP production.…”

Section: Discussionmentioning

confidence: 99%

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Femtosecond Laser Direct‐Writing Ablation of Transparent Fluoropolymer Toward Super‐Resolution Imaging of Cell Movements

Ozasa

Obata

Kawano

et al. 2023

Adv Materials Technologies

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Live imaging of living cells in 3D micro/nano-environment is important for advanced biological studies. An issue for super-resolution imaging is refractive index mismatch between the materials used for imaging platform and medium containing cells (water). Fluoropolymer CYTOP is the ideal platform material due to its refractive index close to that of water. Herein, femtosecond laser ( 220fs) is exploited to ablate CYTOP at three laser wavelengths of 257, 515, and 1030 nm. Linear power dependences of the ablation rate obtained for all wavelengths indicate that ablation mechanisms of CYTOP are attributed to the production of fragmented CYTOPs (frag-CYTOPs) inside the film to induce efficient light absorption for subsequent laser pulses. The frag-CYTOPs can effectively absorb UV-Vis light, whereas those left behind generate green fluorescence. Importantly, the shortest wavelength of 257 nm offers the best ablation quality in terms of surface smoothness and low fluorescence with the highest ablation rate. We elucidate that the refractive-index matching of CYTOP/water is effective for clear imaging of shapes/fluorescence of cells on 3D structures, e.g., HeLa cells on V-shaped trenches. The fabrication of a microscopic 3D fluorescence code tag embedded in the CYTOP films is further demonstrated.

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Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Femtosecond Laser Direct‐Writing Ablation of Transparent Fluoropolymer Toward Super‐Resolution Imaging of Cell Movements

Ozasa

Obata

Kawano

et al. 2023

Adv Materials Technologies

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“…With the aim to achieve the unaltered and efficient transfer of MAPLE-processed coatings, the optimal selection of laser parameters (mainly, the laser energy distribution over the effective target area) is generally required. Mostly, compositional and microstructural tuning studies between preprocessed materials and materials processed at different laser fluences are considered [ 84 , 85 ]. The IRM results, consisting in complementary IR spectra ( Figure 3 c) and IR maps ( Figure 3 a,b) of drop-cast (pristine) and MAPLE samples revealed that the 400 mJ/cm 2 laser fluence is optimal for the MAPLE processing of Ag@C 18 -nGO coatings.…”

Section: Discussionmentioning

confidence: 99%

Silver/Graphene Oxide Nanostructured Coatings for Modulating the Microbial Susceptibility of Fixation Devices Used in Knee Surgery

Constantinescu,

Niculescu,

Hudiță

et al. 2023

IJMS

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Exploring silver-based and carbon-based nanomaterials’ excellent intrinsic antipathogenic effects represents an attractive alternative for fabricating anti-infective formulations. Using chemical synthesis protocols, stearate-conjugated silver (Ag@C18) nanoparticles and graphene oxide nanosheets (nGOs) were herein obtained and investigated in terms of composition and microstructure. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) characterizations revealed the formation of nanomaterials with desirable physical properties, while X-ray diffraction (XRD) analyses confirmed the high purity of synthesized nanomaterials. Further, laser-processed Ag@C18-nGO coatings were developed, optimized, and evaluated in terms of biological and microbiological outcomes. The highly biocompatible Ag@C18-nGO nanostructured coatings proved suitable candidates for the local modulation of biofilm-associated periprosthetic infections.

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“…This results in alternations of polymer properties [5]. Likewise, the changes in chemical properties of polymeric matter are almost appropriate processes for the production of nanomaterials, 3D photo-polymerization and laser lithography [6]. There are several sorts of Makrofol (bisphenol-A polycarbonate) Nuclear Track Detectors (NTDs).…”

Section: Introductionmentioning

confidence: 99%

Radiation Induced Changes in Makrofol PCVM Polycarbonate

Bahareth¹

2022

J Miner Sci Materials

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Makrofol PCVM is a sort of Makrofol polycarbonate solid state nuclear track detector. It is worth mentioning that this paper is almost the first one that deals with the modification of the optical properties of this type of Makrofol under the effect of laser radiation. Samples from Makrofol PCVM were exposed to infrared pulsed laser with different fluences ranging from 15 to 125 J/cm2 . UV spectroscopic technique was used to obtain knowledge about the optical parameters that describe the samples under study. The changes of Urbach energy (Eu ), optical band gap (Eg ) and refractive index (n) with the laser fluence were investigated. Both Eu and n increased with increasing the fluence up to 125 J/cm2 , associated with a decrease of Eg values. These trends were assigned to the predominance of chain crosslinking that damaged the crystalline portion in the Makrofol polymer. Additionally, we used the CIE technique to calculate the color differences between the noncoloured pristine and the irradiated samples. The crosslinking created color centers that produced color difference between the exposed films and the uncolored pristine Makrofol film. The color difference was significant as the values of ΔE were greater than 5. This optimized the Makrofol polymer to be used in dosimetric applications.

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Laser Interactions with Organic/Polymer Materials

Cited by 3 publications

References 268 publications

Femtosecond Laser Direct‐Writing Ablation of Transparent Fluoropolymer Toward Super‐Resolution Imaging of Cell Movements

Femtosecond Laser Direct‐Writing Ablation of Transparent Fluoropolymer Toward Super‐Resolution Imaging of Cell Movements

Silver/Graphene Oxide Nanostructured Coatings for Modulating the Microbial Susceptibility of Fixation Devices Used in Knee Surgery

Radiation Induced Changes in Makrofol PCVM Polycarbonate

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