Search

This paper reports a highly effective method for replicating large-area micropattern devices through hybrid extrusion rolling embossing using a roller mold, wherein a thin stainless steel mold with a large-area micropattern is wrapped onto a metallic roll to form a roller mold. During the hybrid extrusion rolling embossing period, the molten polymer film is extruded and immediately pressed against the embossing roller and roller mold, which results in the molten polymer completely filling the micropattern on the surface of the roller mold. Next, the molten polymer film is cooled and wound using a conveying system equipped with highly polished rollers. Thus, a continuous polymer film with many large-area micropattern devices can be fabricated. In this study, a new hybrid extrusion rolling embossing system was designed, constructed, and tested; the basic film extrusion and rolling embossing conditions were investigated; and the thickness uniformity of the polymer films and the replication quality of the micropattern devices were measured and analyzed. The results indicate that the hybrid extrusion rolling embossing can potentially be used for continuous mass production of large-area micropattern devices. [ABSTRACT FROM AUTHOR]

Background: Osteoblastoma is a rare and benign tumor which requires early diagnosis and surgical excision. Scoliosis is a common presentation following osteoblastoma. It is considered due to pain-provoked muscle spasm on the side of the lesion. Few researches about osteoblastoma combined with severe scoliosis have been reported.Case Presentation: A 14-year-old girl presents with progressive scoliosis deformity for 3 years, with gradually appeared low back pain and numbness of left leg. Radiographic results showed osteoblastic mass at the left side of L3-L4 with severe scoliosis deformity, pelvic obliquity and spinal imbalance. The patient underwent posterior tumor excision, spinal decompression, scoliosis correction, spinal fusion with auto-graft and instrumentation from T8-S1. The mass was found to be osteoblastoma. The patient had a full neurological recovery with no aggravate of scoliosis or spinal imbalance during the follow-up.Conclusions: This case emphasizes the importance of early diagnosis and surgical treatment of osteoblastoma. Early surgical excision will not only prevent neurological deficit but also the progression of scoliosis. Atypical scoliosis presence without pain requires carefully examination of whether a tumor exists. [ABSTRACT FROM AUTHOR]

Five new isomorphic three-dimensional (3D) heterometallic 3d-3d azide complexes, [CuNi1-xCox(N3)2(isonic)2]8 (x = 0 for 1, x = 0.3 for 2, x = 0.5 for 3, x = 0.6 for 4, and x = 1 for 5), were obtained by assembling CuII, MII (NiII and CoII), azide, and pyridyl carboxylate in hydrothermal condition. The 3D structure can be described as end on (EO) azide and syn,syn carboxylates mixed bridged alternate Cu-M chains linked by the pyridyl groups. Dominant ferromagnetic interactions were observed between the CuII and MII ions in the chains. At low temperature diverse magnetic phenomena were presented in those complexes. As the NiII ions were replaced by CoII ions with large anisotropy, the magnetism of the complexes change gradually from metamagnet to single-chain magnet (SCM)-like behaviors. [ABSTRACT FROM AUTHOR]

Two new azido-CoIIcomplexes with pyrazine carboxylato ligands, [Co(N3)(L)·H2O]n(L= pyrazine-2-carboxylato) (1) and [CoNa(N3)2(L)]n(2), have been obtained by carefully tuning the CoII : N3−ratio. Here we present the structural and magnetic characterization of these new species. Modulation of the coordination environment of CoIIleads to a variation of the magnetic properties of the obtained compounds. Complex 1exhibits ferromagnetically coupled [Co2] units that form the rungs of the ladder with a nearly negligible coupling between these units, while complex 2is a 2D arrangement of 1D CoIIsingle-chain magnets. [ABSTRACT FROM AUTHOR]

By changing template cation but introducing trivalent iron ions in the known niccolite structural metal formate frameworks, three complexes formulated [NH2(CH3)2][FeIIIMII(HCOO)6] (M = Fe for 1, Mn for 2, and Co for 3) were synthesized and magnetically characterized. The variation in the compositions of the complexes leads to three different complexes: mixed-valent complex 1, heterometallic but with the same spin state complex 2, and heterometallic helerospin complex 3. The magnetic behaviors are closely related to the divalent metal ions used. Complex 1 exhibits negative magnetization assigned as Néel N-Type ferimagnet with an asymmetric magnetization reversal in the hysteresis loop, and complex 2 is an antiferromagnet with small spin canting (αcanting ≈ 0.06° and Tcanting = 35 K), while complex 3 is a ferrimagnet with TN = 32 K. [ABSTRACT FROM AUTHOR]

A new three-dimensional MnII complex, [Mn3(HCO2)2(L)2(OCH3)2], 1 (L= nicotinate N-oxide), was synthesized by solvothermal reaction and magnetically characterized. Complex 1 exhibits an unprecedented 3,6-connected 5-nodal net topology with Schläfli notation (42;6)4(43)2(46;66;83;10)2(48;66;8) and was assigned as a homospin ferrimagnet. Interestingly, when 1 was placed in air for ca. one month, the methoxy anions in 1 were gradually exchanged by hydroxyl anions and 1 underwent a single-crystal-to-single-crystal structural transition to a new but similar complex, [Mn3(HCO2)2(L)2(OH)2]∙4H2O, 2. The anion exchange and water molecules filling the channels of 2 affect the magnetic behavior at low temperature compared to that of 1. [ABSTRACT FROM AUTHOR]

Through the use of a series of structurally related benzoates bearing different substituents as coligands, three new azido-copper compounds, [Cu(benzoate)(N3)]n (1), [Cu(2-methyl-benzoate)(N3)]n (2), and [Cu(1-naphthoate)(N3)]n (3), have been successfully obtained and structurally and magnetically characterized. Single-crystal structure analyses indicated that the uncoordinating substituents in the benzoates greatly affect the structure of the complexes. Complex 1 displays isolated ferromagnetic chains with the largest Cu-N-Cu angle in known carboxylate/end-on-azido mixed-bridged copper systems, while complexes 2 and 3 were 2D coordination polymers, containing μ-(1,1,3,3) and μ-(1,1,3) bridging azides and exhibiting new azido-copper networks with (44) and (4.82) topologies, respectively. Furthermore, 2 was a chiral complex obtained through spontaneous resolution. In the low-temperature range, both 2 and 3 showed spontaneous magnetization with characteristics of soft ferromagnetic magnetism with phase transition temperatures of 13 and 10 K, respectively. [ABSTRACT FROM AUTHOR]

A new 3D porous NiII-azido complex has been synthesized and characterized and exhibits guest sorption properties explored by single-crystal to single-crystal transformations and linear ferromagnetic chains held together by a Ni–isonicotinate framework. [ABSTRACT FROM AUTHOR]

A new azido-NiIIcomplex constructed from nicotinate has been obtained by cation−anion pairs as templates under hydrothermal conditions, which exhibits three-dimensional Kagomé topology and ferromagnetic coupling. [ABSTRACT FROM AUTHOR]

The reactions of MnII ions with azido ligands in the presence of nicotinic/isonicotinic acids gave two manganese(ll) azido coordination polymers, [Mn3(L1)2(N3)4]n∙nH2O (1) and [Mn2(L2)(N3)3]n (2), where L1 = nicotinate and L2 = isonicotinate, with different topological structures. Complex 1 consists of 2D azido—MnII planes, which is further linked by L1 to form a 3D framework with unprecedented 3,6-connected 4-nodal net topology, and complex 2 presents an unprecedented 3,4,6-connected 6-nodal 3D azido—MnII structure with L2 as the coligand. Magnetic susceptibility measurements reveal dominant antiterromagnetic coupling existing in 1 and 2. Complex 1 is a spin-competitive system and enters into a weak ferromagnetic-to-magnetic phase transition at the critical temperature of 6 K due to spin canting. Complex 2 is an antiferromagnet and exhibits field-induced spin-flop behavior. [ABSTRACT FROM AUTHOR]

Four novel AgI coordination complexes with azole heterocycle ligands bearing acetic acid group, [AgL1]n (1), [Ag(L2HL2)]n (2), [AgL3]n (3) and [Ag(L4)]n (4) (here, HL1 = 1H-imidazole-1-acetic acid, HL2 = 1H-benzimidazole-1-acetic acid, HL3 = 1H-1,2,4-triazole-1-acetic acid, HL4 = 1H-benzotriazole-1-acetic acid), have been synthesized and structurally characterized by elemental analysis, IR and X-ray diffraction. Structural analyses show that complex 1 possesses a two-dimensional structure, which contains silver chains formed by weak Ag–Ag interactions, and 2 consists of neutral chains connected by weak bonds (O⋯H⋯O), while 3 and 4 have a three-dimensional network and a one-dimensional chain structure, respectively. It is interesting that in 1 there exist Ag–Ag interactions with a separation of 3.156 Å, which play an important role in the formation of the complex. Furthermore, the conductivity of 1 was studied in the powder state. [ABSTRACT FROM AUTHOR]

Three new CoII–azido complexes, [Co3(L)2(o-BDC)2(N3)2]n(1), [Co3(L)2(m-BDC)2(N3)2]n·nH2O (2), and [Co2(L)2(p-BDC)(N3)2]n·2nMeOH (3) [o-BDC = 1,2-benzenedicarboxylate, m-BDC = 1,3-benzenedicarboxylate, p-BDC = 1,4-benzenedicarboxylate, and L= di(1H-imidazol-1-yl)methane], have been constructed from di(1H-imidazol-1-yl)methane, azido, and different aromatic dicarboxylates under hydrothermal conditions. Complex 1takes a diatopology with the Co3units as connecting nodes, and complex 2is a two-dimensional sqllayer that further extends to a three-dimensional (3D) supramolecular network via π···π interaction between m-BDC ligands, while complex 3forms a 3D pcunetwork based on Co2units as nodes. The investigaton of magnetic properties of complexes 1–3demonstrates that they all display ferromagnetic coupling between CoIIions but antiferromagnetic interaction between Co3or Co2units. [ABSTRACT FROM AUTHOR]

Two isomorphous 3D porous metamagnets, ([M6(N3)12L6]∙(H2O)13)∞ (M = NiII, 1; CoII, 2), have been constructed from 2-(1,3,4-thiadiazol-2-ylthio)acetic acid (HL), with azido as the auxiliary ligand. Single-crystal X-ray analysis indicates that the complexes possess hexagonal channels with dimensions of about 8.3 Å x 8.3 Å along the c axis and void space of about 25% per cell volume. Hydrogen adsorption measurements at 740 Torr and 77 K reveal that hydrogen uptakes of 0.68 and 0.83 wt % were observed in 1 and 2, respectively, with BET surface areas of 309 and 328 m2/g. Magnetic measurement reveals that both of them exhibit global metamagnetic behaviors resulted from strong intrachain ferromagnetic couplings and weak interchain antiferromagnetic interactions, with critical fields of 22 kOe and 6 kOe for 1 and 2, respectively. [ABSTRACT FROM AUTHOR]

Three new 1D lanthanide-azido complexes, [Ln2(N3)(isonic)2- (OH)3(Hisonic)(H2O)]n (Ln = GdIII, EuIII and SmIII), were synthesized by hydrothermal reaction and their magnetic properties were studied. [ABSTRACT FROM AUTHOR]

Three new 1D lanthanide-azido complexes, [Ln2(N3)(isonic)2-(OH)3(Hisonic)(H2O)]n(Ln = GdIII, EuIIIand SmIII), were synthesized by hydrothermal reaction and their magnetic properties were studied. [ABSTRACT FROM AUTHOR]

Two new 3D copper(ll) azido isomers, [Cu(N3)(nic)]∞. (1 and 2) (nic = nicotinate), have been synthesized and characterized. To the best of our knowledge, 1 is the first metal azido complex showing rutile-type topology, while 2 is a chiral compound obtained by spontaneous resolution upon crystallization. [ABSTRACT FROM AUTHOR]

A novel one-dimensional manganese(II) azido complex, [Mn2(N3)4-(phen)2]n (1), in which the azido bridging ligands take on an unusual new type of combination with the metal center as the sign of [-EO-EO-EO-EE-]n, has been hydrothermally synthesized, and its magnetic properties have been studied. [ABSTRACT FROM AUTHOR]