Article
Polymer Science
Martyna Durko-Maciag, Gilles Ulrich, Julien Massue, Jaroslaw Mysliwiec, Konrad Cyprych
Summary: This work demonstrates the successful application of Excited-State Intramolecular Proton Transfer (ESIPT) fluorophores as photoinitiators for microfabrication. The influence of chemical structure on this application was investigated, followed by analysis of two-photon polymerization. The study determined the quality of fabricated structures and polymerization thresholds, with one of the chromophores having an impressively low value of 11 nJ.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
N. Maximilian Bojanowski, Aleksandra Vranic, Vincent Hahn, Pascal Rietz, Tobias Messer, Julian Brueckel, Christopher Barner-Kowollik, Eva Blasco, Stefan Braese, Martin Wegener
Summary: Recent studies have introduced a new generation of photoinitiators for 3D laser nanoprinting, replacing two-photon absorption with two-step absorption. This can now be achieved using inexpensive blue laser diodes instead of expensive femtosecond laser systems. Additionally, researchers are exploring alternative photoinitiators that can be excited by one-color two-step absorption and be de-excited by a different laser color.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Polymer Science
Shixiong Chen, Chun Cao, Xiaoming Shen, Yiwei Qiu, Cuifang Kuang, Decheng Wan, Ming Jin
Summary: Three sulfonium salt photoinitiators based on 1,3,5-triphenyl-2-pyrazoline were synthesized, and their molecular structures, photophysical and photochemical properties under one/two-photon irradiation were investigated. The study revealed their potential applications in LED photocuring and two-photon 3D microfabrication.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Teng Chi, Paul Somers, Daniel A. Wilcox, Ashley J. Schuman, Jason E. Johnson, Zihao Liang, Liang Pan, Xianfan Xu, Bryan W. Boudouris
Summary: ITX is a common photoinitiator in DLW polymerization processes due to its high-efficiency photoinitiating abilities. However, improved photoinitiating materials are required for advanced high-throughput nanomanufacturing techniques. Thioxanthone-based photoinitiators with tailored optical and charge transfer properties were designed and synthesized to demonstrate enhanced two-photon polymerization DLW for superresolution properties.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Engineering, Manufacturing
Qin Hu, Graham A. Rance, Gustavo F. Trindade, David Pervan, Long Jiang, Aleksandra Foerster, Lyudmila Turyanska, Christopher Tuck, Derek J. Irvine, Richard Hague, Ricky D. Wildman
Summary: This study investigates the correlation between printing parameters, resin composition and the final properties of 2PP structures, and advances the understanding of 2PP process to enable controlled deposition of various materials and manufacture of complex 3D structures.
ADDITIVE MANUFACTURING
(2022)
Article
Spectroscopy
Feng-Tao Yu, Ze Huang, Jia-Xiang Yang, Long-Mei Yang, Xian-Yun Xu, Jian-Yan Huang, Lin Kong
Summary: Two viscosity-sensitive fluorescent probes were designed and synthesized to localize in lysosome and mitochondria in living HeLa cells, respectively. The fluorescence quantum yield and two-photon absorption cross section of the probes were significantly increased with the increase of viscosity. Fluorescence lifetime imaging of the cells stained with the probes revealed the viscosity range of lysosome and mitochondria. This type of probe is of great importance for monitoring diseases associated with abnormal viscosity.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Spectroscopy
Xinya Hao, Jingting Zhan, Chen Geng, Weiying Lin
Summary: A new fluorescent probe was developed to detect changes in intracellular viscosity. The probe showed high sensitivity for viscosity measurement and demonstrated excellent performance in both living cells and tissues, indicating its wide potential applications in biomedicine.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Analytical
Wei Du, Jiqing Wang, Haixiao Fang, Wenhui Ji, Yi Liu, Yunwei Qu, Duoteng Zhang, Tao Shao, Xiyan Hou, Qiong Wu, Lin Li
Summary: A dual-functional fluorescent probe, CQ-1, was designed for rapid and accurate detection of early cancer biomarkers. It can visualize the changes of nitroreductase and viscosity in cancer cell mitochondria while displaying mitochondrial targeting ability.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Polymer Science
Pieter F. J. van Altena, Angelo Accardo
Summary: The mechanical properties of 2PP polymers depend on printing parameters. The study characterized these structures fabricated with different parameters and found the minimum and maximum reported Young's modulus. The study also investigated the smallest achievable feature size and maximum beam length, and showed the potential of this material in various cell biology applications.
Article
Chemistry, Applied
Xiaobing Ju, Xiuyuan Hu, Yanjing Gao, Jun Nie, Fang Sun
Summary: This study introduces two novel photoinitiators for LED photopolymerization, with good absorption and initiating ability. Among them, NBT-HD2 with acryloyl group shows excellent capability in reducing oxygen inhibition and outstanding migration stability in polymer film.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Chemistry, Multidisciplinary
Ruilei Wang, Huaiman Cao, Jianzhang Zhao, Fabiao Yu
Summary: We synthesized a series of amino-substituted 9,10-anthraquinone derivatives to investigate their photophysical properties, particularly the intersystem crossing (ISC) efficiency and the triplet excited states. Monoamino-substituted derivatives exhibited a red-shifted absorption band at 509 nm compared to chloro-anthraquinone derivatives (lambda(abs) = 340 nm). Interestingly, additional amino substituents on the anthraquinone chromophore, i.e. diamino-substituted derivatives, did not induce further red-shifting of the absorption band. Only diamino derivatives showed decent ISC efficiency (singlet oxygen quantum yield, phi(Delta), up to 33.3%), while monoamino derivatives exhibited negligible phi(Delta) values. Nanosecond transient absorption spectra confirmed the formation of a triplet excited state with a lifetime of approximately 2.5 mu s. This short triplet excited state lifetime was attributed to the n-pi* character of the T-1 states in the diamino-substituted derivatives, as supported by DFT computations. We demonstrated that bisamino-substituted anthraquinones can serve as efficient photoinitiators for photopolymerization of alkene monomers, whereas derivatives with poor ISC capability showed minimal photopolymerization effects. The mechanism likely involves hydrogen abstraction by the photoinitiators in their triplet excited states. These findings suggest that compounds exhibiting efficient ISC and T-1 states with n-pi* character could be developed as efficient photoinitiators for radical polymerization of alkene monomers.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Geochemistry & Geophysics
Francisco Caceres, Bettina Scheu, Kai-Uwe Hess, Corrado Cimarelli, Jeremie Vasseur, Melanie Kaliwoda, Donald B. Dingwell
Summary: The cooling rate has a significant impact on the formation of Fe-Ti oxide nanolites and the rheology of the magma, with slow cooling rates leading to nanolite formation and structural changes in the melt. Nanolites are likely to increase magma viscosity and provide sites for heterogeneous bubble nucleation in degassing magmas.
Article
Chemistry, Analytical
Tianyu Liang, Dongliang Zhang, Wei Hu, Chenyang Tian, Lingyu Zeng, Tianhong Wu, Dongqing Lei, Taotao Qiang, Xuekang Yang, Xiaolong Sun
Summary: The dual lock-and-key fluorescence probe demonstrated dual responses towards hydrogen peroxide and viscosity in vitro. In cellular experiments, the probe showed good biocompatibility, low toxicity, and responses towards hydrogen peroxide.
Article
Engineering, Multidisciplinary
Zainab Y. Shnain, Asawer A. Alwaiti, Musaab K. Rashed, Zaidon Mohsin Shakor
Summary: This study investigates the effect of various parameters on nanosilica enhanced two phase flow in pipelines using experimental and data-driven approach. Artificial Neural Network (ANN) models accurately predicted fluid parameters with low MSE and high R values, demonstrating the robustness of the ANN technique in modeling fluid flow characteristics. Sensitivity analysis showed that nanosilica concentration had the most significant influence on the outputs of the ANN model.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
S. B. Naveen Kumar, B. M. Shankar, N. Latha, I. S. Shivakumara
Summary: A comprehensive investigation was conducted to study the impact of viscosity-temperature variations on porous penetrative convection. The analysis revealed that the combination of variable viscosity and density-maximum characteristic expedited the onset of porous convection and reduced the size of convection cells.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Organic
Keng Lung Lee, Joey Feld, Yael Ben-Tal, Zhaoyang Guo, Paul Hume, Erin M. Leitao
ASIAN JOURNAL OF ORGANIC CHEMISTRY
(2019)
Review
Chemistry, Physical
Yael Ben-Tal, Patrick J. Boaler, Harvey J. A. Dale, Ruth E. Dooley, Nicole A. Fohn, Yuan Gao, Andres Garcia-Dominguez, Katie M. Grant, Andrew M. R. Hall, Hannah L. D. . Hayes, Maciej M. Kucharski, Ran Wei, Guy C. Lloyd-Jones
Summary: This tutorial-style review discusses the application of solution-phase NMR in analyzing the mechanisms of homogeneous organic and organometallic reactions and processes. It emphasizes the advantages of solution-phase NMR spectroscopy, such as non-destructive, quantitative analysis of various nuclei common to organic and organometallic reactions, providing detailed structural information. The review is divided into two parts: the first part introduces general techniques, equipment, and guidelines for their selection and application, while the second part presents case studies illustrating specific techniques and approaches.
PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Yael Ben-Tal, Guy C. Lloyd-Jones
Summary: The Ni/Ir-photocatalyzed coupling of ArBr with RBr was studied using in situ LED -F-19 NMR spectroscopy. Factors such as light, ArBr, Ni, and Ir were found to control the rate of ArBr consumption, while [(TMS)3SiH] and RBr independently controlled the product selectivity. The major resting state of nickel was identified as ArNiII(L)Br, and the complex undergoes Ir-photocatalyzed conversion to products in competition with the release of ArBr.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
