We studied the quantum dot-liposome complex (QLC), which is the giant unilamellar vesicle with quantum dots (QDs) incorporated in its lipid bilayer. A spin coating method in conjunction with the electroformation techn...We studied the quantum dot-liposome complex (QLC), which is the giant unilamellar vesicle with quantum dots (QDs) incorporated in its lipid bilayer. A spin coating method in conjunction with the electroformation technique yielded vesicles with highly homogeneous unilamellar structure. We observed QD size dependence of the QLC formation: QLCs form with blue, green and yellow-emission QD (core radius ~1.05 nm, 1.25 nm and 1.65 nm) but not with red-emission QD (core radius ~2.5 nm). In order to explain this size dependence, we made a simple model explaining the QD size effect on QLC formation in terms of the molecular packing parameter and the lipid conformational change. This model predicts that QDs below a certain critical size (radius ≈ 1.8 nm) can stably reside in a lipid bilayer of 4 - 5 nm in thickness for Egg-PC lipids. This is consistent with our previous experimental results. In the case of red-emission QD, QD-aggregations are only observed on the fluorescent microscopy instead of QLC. We expected that the reduction of packing parameter (P) would lead to the change of specific QD radius. This prediction could be verified by our experimental observation of the shift of the specific QD size by mixing DOPG.展开更多
QLC（Quad-Level Cell） NAND flash will be one of the future technologies for next generation memory chip after three-dimensional（3D） TLC（Triple-Level Cell） stacked NAND flash. In QLC device, data errors will easil...QLC（Quad-Level Cell） NAND flash will be one of the future technologies for next generation memory chip after three-dimensional（3D） TLC（Triple-Level Cell） stacked NAND flash. In QLC device, data errors will easily occur because of 2~4 data levels in the limited voltage range. This paper studies QLC NAND technology which is 4 bits per cell. QLC programming methods based on 16 voltage levels and reading method based on ＂half-change＂ Gray coding are researched. Because of the probable error impact of QLC NAND cell＇s voltage change, the solution of generating the soft information after XOR（exclusive OR） the soft bits by internal read mechanism is presented for Low-Density Parity-Check（LDPC） Belief Propagation（BP） decoding in QLC design for its system level application.展开更多
Reactions of DyCl_(3)·6H_(2)O or Dy_(2)O_(3) with 2-quinolinecarboxylic acid(H-QLC)yielded two compounds,namely,[Dy_(4)(QLC)_(12)(H_(2)O)_(6)]·4H_(2)O(1)and[Dy(QLC)_(3)(H_(2)O)_(2)]_(n)(2).Compound 1 is a li...Reactions of DyCl_(3)·6H_(2)O or Dy_(2)O_(3) with 2-quinolinecarboxylic acid(H-QLC)yielded two compounds,namely,[Dy_(4)(QLC)_(12)(H_(2)O)_(6)]·4H_(2)O(1)and[Dy(QLC)_(3)(H_(2)O)_(2)]_(n)(2).Compound 1 is a linear tetranuclear structure with one central[Dy_(2)(QLC)_(4)(H_(2)O)_(4)]subunit and two terminal[Dy(QLC)_(3)(H_(2)O)]subunits linked by bridging QLC^(-)ligands.Compound 2 has a one-dimensional(1D)chain wherein the[Dy(QLC)_(2)]unit formed by two QLC^(-)ligands chelating a Dy(Ⅲ)ion is connected by the bridging QLC^(-)ligands.Compounds 1 and 2 exhibit slow magnetic relaxation behaviour in the absence of a static magnetic field,which is rarely observed in lanthanide-carboxylate compounds.During the structural evolution from a linear Dy_(4) cluster of 1 into a 1D chain of 2,the anisotropy energy barrier(U_(eff))is enhanced from 45.4(2)to 144.2(1)K.Though the Dy(Ⅲ)centers in 1 and 2 all are eight-coordinated with square antiprismatic coordination environments,the higher energy barrier observed for 2 could be the result of a more favorable crystal field for the Dy(Ⅲ)ions in 2.展开更多
文摘We studied the quantum dot-liposome complex (QLC), which is the giant unilamellar vesicle with quantum dots (QDs) incorporated in its lipid bilayer. A spin coating method in conjunction with the electroformation technique yielded vesicles with highly homogeneous unilamellar structure. We observed QD size dependence of the QLC formation: QLCs form with blue, green and yellow-emission QD (core radius ~1.05 nm, 1.25 nm and 1.65 nm) but not with red-emission QD (core radius ~2.5 nm). In order to explain this size dependence, we made a simple model explaining the QD size effect on QLC formation in terms of the molecular packing parameter and the lipid conformational change. This model predicts that QDs below a certain critical size (radius ≈ 1.8 nm) can stably reside in a lipid bilayer of 4 - 5 nm in thickness for Egg-PC lipids. This is consistent with our previous experimental results. In the case of red-emission QD, QD-aggregations are only observed on the fluorescent microscopy instead of QLC. We expected that the reduction of packing parameter (P) would lead to the change of specific QD radius. This prediction could be verified by our experimental observation of the shift of the specific QD size by mixing DOPG.
文摘QLC（Quad-Level Cell） NAND flash will be one of the future technologies for next generation memory chip after three-dimensional（3D） TLC（Triple-Level Cell） stacked NAND flash. In QLC device, data errors will easily occur because of 2~4 data levels in the limited voltage range. This paper studies QLC NAND technology which is 4 bits per cell. QLC programming methods based on 16 voltage levels and reading method based on ＂half-change＂ Gray coding are researched. Because of the probable error impact of QLC NAND cell＇s voltage change, the solution of generating the soft information after XOR（exclusive OR） the soft bits by internal read mechanism is presented for Low-Density Parity-Check（LDPC） Belief Propagation（BP） decoding in QLC design for its system level application.
基金supported by the NNSF of China(Grants,21561015,21361011,and 21661014)the Young Scientist Training Project of Jiangxi Province(Grant 20153BCB23017)the NSF of Jiangxi(Grant 20151BAB203002).
文摘Reactions of DyCl_(3)·6H_(2)O or Dy_(2)O_(3) with 2-quinolinecarboxylic acid(H-QLC)yielded two compounds,namely,[Dy_(4)(QLC)_(12)(H_(2)O)_(6)]·4H_(2)O(1)and[Dy(QLC)_(3)(H_(2)O)_(2)]_(n)(2).Compound 1 is a linear tetranuclear structure with one central[Dy_(2)(QLC)_(4)(H_(2)O)_(4)]subunit and two terminal[Dy(QLC)_(3)(H_(2)O)]subunits linked by bridging QLC^(-)ligands.Compound 2 has a one-dimensional(1D)chain wherein the[Dy(QLC)_(2)]unit formed by two QLC^(-)ligands chelating a Dy(Ⅲ)ion is connected by the bridging QLC^(-)ligands.Compounds 1 and 2 exhibit slow magnetic relaxation behaviour in the absence of a static magnetic field,which is rarely observed in lanthanide-carboxylate compounds.During the structural evolution from a linear Dy_(4) cluster of 1 into a 1D chain of 2,the anisotropy energy barrier(U_(eff))is enhanced from 45.4(2)to 144.2(1)K.Though the Dy(Ⅲ)centers in 1 and 2 all are eight-coordinated with square antiprismatic coordination environments,the higher energy barrier observed for 2 could be the result of a more favorable crystal field for the Dy(Ⅲ)ions in 2.
