用于有效光热加热的纳米金刚石-琼脂糖凝胶,Advanced Functional Materials

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用于有效光热加热的纳米金刚石-琼脂糖凝胶
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-10-08 , DOI: 10.1002/adfm.202309440
Mai S. Rashwan ₁ , Harihara Baskaran ₂ , Clemens Burda ₁

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^{在 6.55 × 10 -5}至 2.29 × 10 ^-2 % v/v的极低颗粒浓度和两种不同尺寸（35 和 160 nm）进行。与基础凝胶相比，激光诱导含有微量 ND 颗粒的凝胶点加热会导致远离点的温度大幅升高。这些增加与任何与颗粒掺入相关的热导率增加不一致。紫外可见光和拉曼光谱研究表明，这种光热现象归因于颗粒浓度和载有纳米颗粒的凝胶的光学散射/捕获的尺寸依赖性变化。凝胶的结构研究表明，ND 颗粒与琼脂糖聚合物结构相关，导致载有颗粒的凝胶中的光学散射和截留增加。总的来说，得出的结论是，在琼脂糖凝胶中结合痕量的纳米金刚石颗粒会显着影响载有纳米颗粒的凝胶的光散射和截留特性，从而影响系统的光热转换效率。这种效应是由添加纳米金刚石颗粒对凝胶的协同改性产生的，而不是纳米颗粒或凝胶单独的独立作用。

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Nanodiamond-Agarose Gels for Effective Photothermal Heating

Experimental investigation of the photothermal properties of carboxylated nanodiamond (ND) particles in agarose gel base medium over a range of very low particle concentrations from 6.55 × 10⁻⁵ to 2.29 × 10⁻²% v/v and two different sizes (35 and 160 nm) is carried out. Laser-induced spot heating of gels with trace amounts of ND particles lead to a very large increase in temperatures away from the spot compared to base gels. These increases are inconsistent with any thermal conductivity increases associated with the incorporation of particles. UV-visible and Raman spectroscopy investigation demonstrates that this photothermal phenomenon is attributed to particle concentrations and size-dependent changes in optical scattering/entrapment of nanoparticle-laden gels. Structural investigation of the gels suggests that ND particles associate with the agarose polymer structure which leads to increased optical scattering and entrapment in particle-laden gels. Collectively, it is concluded that combining trace amounts of nanodiamond particles in agarose gels dramatically affect the light scattering and entrapment properties of the nanoparticle-laden gels, subsequently influencing the photothermal conversion efficiency of the system. This effect arises from the synergistic modification of the gel by the nanodiamond particle addition, rather than the independent effects of nanoparticles or the gel alone.

更新日期：2023-10-08

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