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Shuai Yang,Cai Shi,Keqi Qu,Zhe Sun,Handong Li,Benbin Xu,Zhanhua Huang,Zhanhu Guo 한국탄소학회 2023 Carbon Letters Vol.33 No.7
Seawater evaporation and purification powered by solar energy are considered as a promising approach to alleviate the global freshwater crisis, and the development of photothermal materials with high efficiency is imminent. In this study, cellulose nanofiber (CNF)/MXene/Ni chain (CMN) aerogels were successfully synthesized by electrostatic force and hydrogen bond interaction force. CMN10 achieved a favorable evaporation rate as high as 1.85 kg m? 2 h? 1 in pure water, and the corresponding evaporation efficiency could be up to 96.04%. Even if it is applied to seawater with multiple interference factors, its evaporation rate can still be 1.81 kg m? 2 h? 1. The superior seawater evaporation activity origins from the promoted separation of photoexcited charges and photothermal conversion by the synergy of Ni chain and MXene, as well as the water transport channel supported by the 3D structure frame of CNF. Most importantly, CMN aerogel can maintain water vapor evaporation rates above 1.73 kg m? 2 h? 1 under extreme conditions such as acidic (pH 2) and alkaline (pH 12) conditions. In addition, various major ions, heavy metals and organic pollutants in seawater can be rejected by CMN10 during desalination, and the rejection rates can reach more than 99.69%, ensuring the purity of water resources after treatment. This work shows the great potential of CMN aerogel as a high-efficiency solar evaporator and low-cost photothermal conversion material. Cellulose nanofiber (CNF)/MXene/Ni chain (CMN) aerogels demonstrated high evaporation of water from sea water.
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Pump Wavelength Dependence of Photodarkening in Yb-Doped Fibers
Huizi Li,Liling Zhang,Sidharthan, Raghuraman,Ho, Daryl,Xuan Wu,Venkatram, Nalla,Handong Sun,Tianye Huang,Seongwoo Yoo IEEE 2017 Journal of Lightwave Technology Vol. No.
<P>Photodarkening in Yb-doped fibers is known to be dependent of Yb population inversion. In addition to this dependence, we report that pump wavelength selection plays a significant role in photodarkening dynamics. It is found that 976 nm pump source can lead to more severe photodarkening effects than 916 nm pumping at the same inversion levels. This observation is consistent in Yb-doped fibers with various compositions. Our work reveals pump wavelength is another determinant factor of photodarkening besides the inversion level and emphasizes the importance of pump wavelength selection in high power Yb-doped fiber lasers and amplifiers.</P>
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Upconversion Nanoparticles as a Contrast Agent for In Vivo Photoacoustic Imaging
( Swarup Kumar Maji ),( Sivaramapanicker Sreejith ),( James Joseph ),( Manjing Lin ),( Tingchao He ),( Yan Tong ),( Handong Sun ),( Sidney Wing-kwong Yu ),( Yanli Zhao ),김동하 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Lanthanide doped upconversion nanomaterials have proven their great potentiality in modern biological applications, however, tracing UC materials from tissue depths still remains challenging due to visible emission, increased optical extinction in biological tissues and luminescence quenching in aqueous/biological conditions, which further limits their optical resolution in vivo. In this work, we report the use of NaYF4:Yb3+,Er3+ UC materials for in vivo photoacoustic imaging (PAI) by making use of hitherto unexplored luminescence quenching effect of UC materials in water. We observed a significant luminescence quenching effect of UC-α-CD in water upon 980 nm excitation. The observed non-radiative relaxation enhances thermal conductivity and subsequent PA signal of UC-α-CD in water. PAI properties of UC-α-CD were then investigated, and its application for in vivo high resolution PAI at 980 nm was demonstrated in live mice and thus proved as an excellent candidate for in vivo PAI.
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