A larger counter-ion could change the environment of trigonal bipyramidal cobalt(Ⅱ)to some extent,diluting the cobalt-containing complex and slowing their magnetic relaxation.Considering this observation,we used a su...A larger counter-ion could change the environment of trigonal bipyramidal cobalt(Ⅱ)to some extent,diluting the cobalt-containing complex and slowing their magnetic relaxation.Considering this observation,we used a sulfur organic ligand NS_(3)^(tBu) to obtain two trigonal bipyramidal Co(Ⅱ)complexes,namely,[Co(NS_(3)^(tBu))Cl]Y,Y=PF_(6)^(-)(1),ClO_(4)^(-)(2).The resulting compound 1(with a larger counter-ion PF_(6)^(-))exhibits a longer relaxation time in comparison to compound 2 prepared with the smaller counter-ion ClO_(4)^(-),even though the presence of weak rhombicity decreases the energy barrier and speeds up the relaxation of the magnetization for the two compounds.Concurrently,we demonstrate that compound 1 has smaller effective energy barrier and displays slower magnetic relaxation rather than compound 2.A smaller dc magnetic field could almost suppress all the quantum tunneling of magnetization(QTM),direct and Raman processes in compound 1,but not in compound 2,which presents all the Orbach,QTM,direct and Raman processes.展开更多
Irreversible reductive insertion of Zn2+transforms Mn3O4 such that the resulting Zn0.2Mn3O4 exhibits highly reversible storage properties of chloride ions,thus rendering Zn0.2Mn3O4 an excellent cathode of aqueous dual...Irreversible reductive insertion of Zn2+transforms Mn3O4 such that the resulting Zn0.2Mn3O4 exhibits highly reversible storage properties of chloride ions,thus rendering Zn0.2Mn3O4 an excellent cathode of aqueous dual-ion batteries.With Zn2+trapped,Zn0.2Mn3O4 delivers the chloride-storage capacity over 200 mAh/g at an average potential of 1.6 V vs Zn2+/Zn by reversibly forming a new ionic compound equivalent to Zn0.2Mn3O4Cl1.7.Electrochemical quartz crystal microbalance results suggest chloride as the primary charge carrier in the reversible oxidative anion insertion.The Mn3O4 anion-hosting cathode couples with Zn metal anode in a full-cell dual-ion battery,demonstrating stable cycling in practical pouch cells with an energy density of 150 Wh/kg based on the mass of both electrodes.展开更多
Chitosan microparticles for controlling drug delivery have been prepared by water in oil(w/o)emulsification process.Glutaraldehyde is normally used as cross-linking agent for hardening chitosan polymer into the rigid ...Chitosan microparticles for controlling drug delivery have been prepared by water in oil(w/o)emulsification process.Glutaraldehyde is normally used as cross-linking agent for hardening chitosan polymer into the rigid particles[1].From the cationic charge of ammonium groups in chitosan structure,moreover,it is also possible to cross-link the polymeric chain by the anionic counter-ion substances.Sodium hydroxide(NaOH)and tripolyphosphate(TPP)are the rich negatively charged molecules that are normally used in pharmaceutical preparations.They might be more appropriate to be chosen for the co-crosslinking process due to its safety[2].Therefore,this study aimed to investigate the effect of counter-ion NaOH and TPP agents on the properties of chitosan microparticles crosslinked by glutaraldehyde.Metronidazole was used as model drug loaded in these systems.展开更多
Protonating the pyridine rings of poly(pyridine-2,5-diyl) with dodecybenzenesulfonic acid and camphorsulphonic acid produces polymer materials which can be dissolved in chloroform (in contrast to the unprotonated poly...Protonating the pyridine rings of poly(pyridine-2,5-diyl) with dodecybenzenesulfonic acid and camphorsulphonic acid produces polymer materials which can be dissolved in chloroform (in contrast to the unprotonated polymer, which can only be dissolved in strong acids such as formic acid) and allows mixing the protonated polymers with other chloroform soluble conju- gated polymers for use in electronic devices. The protonating behavior of poly(pyridine-2,5-diyl) with two kinds of surfactants is different in some levels. Dodecybenzenesulfonic acid has higher protonating ability than camphorsulphonic acid.展开更多
以哌嗪为连接基团,依次经过酰基化、氢化铝锂还原和季铵化反应,合成了新型季铵盐双子表面活性剂12-PZ-12。用1 H NMR和元素分析进行了结构表征,并研究了其表面活性以及不同种类和浓度的反离子对其表面活性的影响。结果表明,12-PZ-12的...以哌嗪为连接基团,依次经过酰基化、氢化铝锂还原和季铵化反应,合成了新型季铵盐双子表面活性剂12-PZ-12。用1 H NMR和元素分析进行了结构表征,并研究了其表面活性以及不同种类和浓度的反离子对其表面活性的影响。结果表明,12-PZ-12的水溶液在25℃时的临界胶束浓度cmc=4.68×10-4 mol/L,临界胶束浓度下的表面张力γcmc=24.0 mN/m,优于传统的表面活性剂。随着反离子浓度的增加,12-PZ-12的cmc值降低,且Iˉ比Clˉ对其cmc值的影响更为显著。展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.92361301 and 52261135637)Natural Science Foundation of Xiamen University(No.201920)+1 种基金Instrument Improvement Funds of Shandong University Public Technology Platform(No.ts20220102)the receipt of Army Logistics Academy.
文摘A larger counter-ion could change the environment of trigonal bipyramidal cobalt(Ⅱ)to some extent,diluting the cobalt-containing complex and slowing their magnetic relaxation.Considering this observation,we used a sulfur organic ligand NS_(3)^(tBu) to obtain two trigonal bipyramidal Co(Ⅱ)complexes,namely,[Co(NS_(3)^(tBu))Cl]Y,Y=PF_(6)^(-)(1),ClO_(4)^(-)(2).The resulting compound 1(with a larger counter-ion PF_(6)^(-))exhibits a longer relaxation time in comparison to compound 2 prepared with the smaller counter-ion ClO_(4)^(-),even though the presence of weak rhombicity decreases the energy barrier and speeds up the relaxation of the magnetization for the two compounds.Concurrently,we demonstrate that compound 1 has smaller effective energy barrier and displays slower magnetic relaxation rather than compound 2.A smaller dc magnetic field could almost suppress all the quantum tunneling of magnetization(QTM),direct and Raman processes in compound 1,but not in compound 2,which presents all the Orbach,QTM,direct and Raman processes.
文摘Irreversible reductive insertion of Zn2+transforms Mn3O4 such that the resulting Zn0.2Mn3O4 exhibits highly reversible storage properties of chloride ions,thus rendering Zn0.2Mn3O4 an excellent cathode of aqueous dual-ion batteries.With Zn2+trapped,Zn0.2Mn3O4 delivers the chloride-storage capacity over 200 mAh/g at an average potential of 1.6 V vs Zn2+/Zn by reversibly forming a new ionic compound equivalent to Zn0.2Mn3O4Cl1.7.Electrochemical quartz crystal microbalance results suggest chloride as the primary charge carrier in the reversible oxidative anion insertion.The Mn3O4 anion-hosting cathode couples with Zn metal anode in a full-cell dual-ion battery,demonstrating stable cycling in practical pouch cells with an energy density of 150 Wh/kg based on the mass of both electrodes.
文摘Chitosan microparticles for controlling drug delivery have been prepared by water in oil(w/o)emulsification process.Glutaraldehyde is normally used as cross-linking agent for hardening chitosan polymer into the rigid particles[1].From the cationic charge of ammonium groups in chitosan structure,moreover,it is also possible to cross-link the polymeric chain by the anionic counter-ion substances.Sodium hydroxide(NaOH)and tripolyphosphate(TPP)are the rich negatively charged molecules that are normally used in pharmaceutical preparations.They might be more appropriate to be chosen for the co-crosslinking process due to its safety[2].Therefore,this study aimed to investigate the effect of counter-ion NaOH and TPP agents on the properties of chitosan microparticles crosslinked by glutaraldehyde.Metronidazole was used as model drug loaded in these systems.
文摘Protonating the pyridine rings of poly(pyridine-2,5-diyl) with dodecybenzenesulfonic acid and camphorsulphonic acid produces polymer materials which can be dissolved in chloroform (in contrast to the unprotonated polymer, which can only be dissolved in strong acids such as formic acid) and allows mixing the protonated polymers with other chloroform soluble conju- gated polymers for use in electronic devices. The protonating behavior of poly(pyridine-2,5-diyl) with two kinds of surfactants is different in some levels. Dodecybenzenesulfonic acid has higher protonating ability than camphorsulphonic acid.
文摘以哌嗪为连接基团,依次经过酰基化、氢化铝锂还原和季铵化反应,合成了新型季铵盐双子表面活性剂12-PZ-12。用1 H NMR和元素分析进行了结构表征,并研究了其表面活性以及不同种类和浓度的反离子对其表面活性的影响。结果表明,12-PZ-12的水溶液在25℃时的临界胶束浓度cmc=4.68×10-4 mol/L,临界胶束浓度下的表面张力γcmc=24.0 mN/m,优于传统的表面活性剂。随着反离子浓度的增加,12-PZ-12的cmc值降低,且Iˉ比Clˉ对其cmc值的影响更为显著。
