In the present work,the interaction mechanism of specific polyelectrolyte multilayers(PEMs),fabricated by layer-by-layer deposition of polydiallyldimethylammonium chloride(PDDA)and poly(sodium 4-styrenesulfonate)(PSS)...In the present work,the interaction mechanism of specific polyelectrolyte multilayers(PEMs),fabricated by layer-by-layer deposition of polydiallyldimethylammonium chloride(PDDA)and poly(sodium 4-styrenesulfonate)(PSS),is studied using atomic force microscopy.The underwater oil-repellency of PS S-capped PEMs was further explored by measuring the interaction forces between tetradecane droplets and PEMs-coated silica substrates under various salinities.The force curves were analyzed following the Stokes-Reynolds-Young-Laplace theoretical model.Desirable consistency was achieved between the experimental and theoretical calculations at low NaCl concentrations(0.1 mM and 1 mM);however,underestimation of the attractive force was found as the NaCl concentration increases to moderate(10 mM)and high(100 mM)levels.Discrepancy analyses and incorporated features toward a reduced surface charge density were considered based on the previous findings of the orientation of anionic benzenesulfonate moieties(Liu et al.in Angew Chem Int Ed 54(16):4851-4856,2015.https://doi.org/10.1002/anie.201411992).Short-range steric hindrance interactions were further introduced to simulate"brush"effect stemming from nanoscale surface roughness.It is demonstrated in our work that the PSS-capped PEMs remains a stable underwater lipophobicity against high salinity,which renders it potential application in surface wetting modification and anti-fouling.展开更多
Based on the strength and microstructure tests,the effects of the hydantoin epoxy resin content and curing time on the mechanical properties and microstructure of copper tailings specimens were studied.The results sho...Based on the strength and microstructure tests,the effects of the hydantoin epoxy resin content and curing time on the mechanical properties and microstructure of copper tailings specimens were studied.The results showed that the strength of the solidified specimens was increased to 20.84 MPa with 30 wt.%addition of hydantoin epoxy resin.When the specimens with 10%hydantoin epoxy resin were cured for 7 and 14 d,the strengths were 6.33 and 6.67 MPa respectively,which met the requirements as foundation filler and building materials.The microscopic tests showed that the agglomeration was enhanced and the porosities of the solidified specimens were reduced with increase in the hydantoin epoxy resin content,which could greatly enhance the strength of solidified specimens.展开更多
The recent evolution of active components yielded brilliant progresses for organic solar cells(OSCs),yet the mechanism is needed to be clearly understood.In this wo rk,two electron acceptors,a linear SN6-2Br and a V-s...The recent evolution of active components yielded brilliant progresses for organic solar cells(OSCs),yet the mechanism is needed to be clearly understood.In this wo rk,two electron acceptors,a linear SN6-2Br and a V-shaped BTP-2Br,are developed with nitrogen atoms introduced to replace the traditional sp3-hybridized carbon in the fused ring.BTP-2Br possesses an electron-de ficient central core,which exhibits slightly blue-shifted absorption as well as deepened HOMO-level compared with SN6-2Br.The corresponding photovoltaic performance from V-shaped BTP-2Br based devices exhibit superior performance especially in short-circuit current(Jsc),despite an enhanced absorption and charge carrier mobilities for SN6-2Br.The primary reason for the higher JSC from BTP-2Br is faster exciton diffusion and dissociation in ble nds,than those of SN6-2Br.As a result,PBDB-TF:BTP-2Br based devices achieve a power conversion efficiency(PCE)of 13.84%with an voltage-loss of only 0.46 V,which is one of the lowest values ever reported.Moreover,we fabricated semitransparent OSCs that exhibit an excellent PCE of 9.62%with average visible transparency of 20.1%.展开更多
基金the National Natural Science Foundation of China(51774303,51422406,51534007)the National Science and Technology Specific Project(2016ZX05028-004001)111 Project(B18054)for providing support for this research。
文摘In the present work,the interaction mechanism of specific polyelectrolyte multilayers(PEMs),fabricated by layer-by-layer deposition of polydiallyldimethylammonium chloride(PDDA)and poly(sodium 4-styrenesulfonate)(PSS),is studied using atomic force microscopy.The underwater oil-repellency of PS S-capped PEMs was further explored by measuring the interaction forces between tetradecane droplets and PEMs-coated silica substrates under various salinities.The force curves were analyzed following the Stokes-Reynolds-Young-Laplace theoretical model.Desirable consistency was achieved between the experimental and theoretical calculations at low NaCl concentrations(0.1 mM and 1 mM);however,underestimation of the attractive force was found as the NaCl concentration increases to moderate(10 mM)and high(100 mM)levels.Discrepancy analyses and incorporated features toward a reduced surface charge density were considered based on the previous findings of the orientation of anionic benzenesulfonate moieties(Liu et al.in Angew Chem Int Ed 54(16):4851-4856,2015.https://doi.org/10.1002/anie.201411992).Short-range steric hindrance interactions were further introduced to simulate"brush"effect stemming from nanoscale surface roughness.It is demonstrated in our work that the PSS-capped PEMs remains a stable underwater lipophobicity against high salinity,which renders it potential application in surface wetting modification and anti-fouling.
基金financial support from the National Natural Science Foundation of China (Nos. 41972282, 41807253)the Natural Science Foundation of Hunan Province, China (No. 2021JJ30804)the Research Fund Program from Yunnan Diqing Nonferrous Metal Co., Ltd., China (No. DQYS-ZYB-09-(2021)001)
文摘Based on the strength and microstructure tests,the effects of the hydantoin epoxy resin content and curing time on the mechanical properties and microstructure of copper tailings specimens were studied.The results showed that the strength of the solidified specimens was increased to 20.84 MPa with 30 wt.%addition of hydantoin epoxy resin.When the specimens with 10%hydantoin epoxy resin were cured for 7 and 14 d,the strengths were 6.33 and 6.67 MPa respectively,which met the requirements as foundation filler and building materials.The microscopic tests showed that the agglomeration was enhanced and the porosities of the solidified specimens were reduced with increase in the hydantoin epoxy resin content,which could greatly enhance the strength of solidified specimens.
基金financially supported by the National Natural Science Foundation of China (22005002)the Natural Science Foundation of Anhui Province (2208085Y03)+1 种基金Anhui University Scientific Research Start-up Fundsupported by the advanced computing resources provided by the Supercomputing Center of the University of Science and Technology of China。
基金National Natural Science Foundation of China(Nos.21722404,21674093 and 21734008)International Science and Technology Cooperation Program of China(ISTCP)(No.2016YFE0102900)+3 种基金supported by the Fundamental Research Funds for the Central Universities(No.2018XZZX002-16)the support by Zhejiang Natural Science Fund for Distinguished Young Scholars(No.LR17E030001)the support by the China Postdoctoral Science Foundation Funded Project(No.2018M632448)Postdoctoral Science Foundation Funded Project of Zhejiang Province(No.zj2017131)。
文摘The recent evolution of active components yielded brilliant progresses for organic solar cells(OSCs),yet the mechanism is needed to be clearly understood.In this wo rk,two electron acceptors,a linear SN6-2Br and a V-shaped BTP-2Br,are developed with nitrogen atoms introduced to replace the traditional sp3-hybridized carbon in the fused ring.BTP-2Br possesses an electron-de ficient central core,which exhibits slightly blue-shifted absorption as well as deepened HOMO-level compared with SN6-2Br.The corresponding photovoltaic performance from V-shaped BTP-2Br based devices exhibit superior performance especially in short-circuit current(Jsc),despite an enhanced absorption and charge carrier mobilities for SN6-2Br.The primary reason for the higher JSC from BTP-2Br is faster exciton diffusion and dissociation in ble nds,than those of SN6-2Br.As a result,PBDB-TF:BTP-2Br based devices achieve a power conversion efficiency(PCE)of 13.84%with an voltage-loss of only 0.46 V,which is one of the lowest values ever reported.Moreover,we fabricated semitransparent OSCs that exhibit an excellent PCE of 9.62%with average visible transparency of 20.1%.
