石蜡/碱改性硅藻土/膨胀石墨复合相变储热材料的制备及性能
陈丽梅, 赵梦菲, 陈琳, 李丁, 李巍, 韩维野, 王鸿斌
【无机化学学报】doi: 10.11862/CJIC.20230312
通过碱处理,优化了硅藻土(DIA)的孔隙结构,提高了孔隙率,增加了石蜡(paraffin)负载量。通过直接浸渍法制备了新型性状稳定的石蜡/碱改性DIA/膨胀石墨(EG-alDIAP)复合材料,并研究了其结构与性能的关系。结果表明,复合相变材料的石蜡负载量从47.4%提高到了61.1%,进而提高了复合材料的储热性能;向改性DIA中添加膨胀石墨(EG)提高了复合材料的传热能力,添加质量分数10% EG时导热系数提高了113%(从0.276 W·m-1·K-1提高到了0.589 W·m-1·K-1)。随着EG含量的升高,复合相变材料的相变潜热有所增加,但化学相容性、稳定性等无明显变化。含10% EG的石蜡/碱改性DIA复合材料具有可靠的储能性能、良好的温度调节性能和蓄放热能力。
关键词: 复合相变材料, 石蜡, 碱改性硅藻土, 膨胀石墨
Chiral fluorescent sensor Tb3+@Cd-CP based on camphoric acid for the enantioselective recognition of R- and S-propylene glycol
Junying LI, Xinyan CHEN, Xihui DIAO, Muhammad Yaseen, Chao CHEN, Hao WANG, Chuansong QI, Wei LI
【无机化学学报】doi: 10.11862/CJIC.20240084
Herein, a layered chiral coordination polymer, [Cd2(D-cam)2(2, 2'-bipy)2]n (Cd-CP), was synthesized using a solvothermal method with camphoric acid (D-H2cam), 2, 2'-bipyridine (2, 2'-bipy) and Cd2+, and Tb3+@Cd-CP was in-situ synthesized introducing Tb3+ ions. The fluorescence experiments revealed that compared to Cd-CP, Tb3+@Cd-CP exhibited ultra-high fluorescence performance. The luminescence sensing performance demonstrated that Tb3+@Cd-CP could distinguish R/S-propylene glycol (R/S-PG) by fluorescence responses, with fluorescence quenching constant of 5.3×103 and 2.0×103 L·mol-1 respectively and the enantioselectivity factor (α) of 2.65. Moreover, Tb3+@Cd-CP demonstrated limits of detection of 9.3 and 19.0 μmol·L-1 for R-PG and S-PG, respectively, and showed good reproducibility.
关键词: camphoric acid, coordination polymer, enantioselectivity, propylene glycol

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