摘要:
A method for making a series of nanoscale microstructures, including helical microstructures and cylindrical microstructures. This method includes the steps of: (1) forming a chiral block copolymer containing a plurality of chiral first polymer blocks and a second polymer blocks wherein the chiral first polymer blocks have a volume fraction ranging from 20 to 49%; (2) causing a phase separation in the chiral block copolymer. In a preferred embodiment, the chiral block copolymer is poly(styrene)-poly(L-lactide) (PS-PLLA) chiral block copolymer, and the copolymerization process is a living copolymerization process which includes the following steps: (a) mixing styrene with BPO and 4-OH-TEMPO to form 4-hydroxy-TEMPO-terminated polystyrene; and (2) mixing the 4-hydroxy-TEMPO-terminated polystyrene with [(η3-EDBP)Li2]2[(η3-nBu)Li(0.5Et2O)]2 and L-lactide in an organic solvent preferably CH2Cl2 to form the poly(styrene)-poly(L-lactide) chiral block copolymer. Transmission electron microscopy (TEM) and small X-ray scattering (SAXS) studies show that when the volume fraction of poly(L-lactide) is about 35-37%, nanoscale helices with a pitch of 43.8 nanometers and a diameter of 34.4 nanometers were observed.
摘要:
A method for making a series of nanoscale microstructures, including helical microstructures and cylindrical microstrustures. This method includes the steps of: (1) forming a chiral block copolymer containing a plurality of chiral first polymer blocks and a second polymer blocks wherein the chiral first polymer blocks have a volume fraction ranging from 20 to 49%; (2) causing a phase separation in the chiral block copolymer. In a preferred embodiment, the chiral block copolymer is poly(styrene)-poly(L-lactide) (PS-PLLA) chiral block copolymer, and the copolymerization process is a living copolymerization process which includes the following steps: (a) mixing styrene with BPO and 4-OH-TEMPO to form 4-hydroxy-TEMPO-terminated polystyrene; and (2) mixing the 4-hydroxy-TEMPO-terminated polystyrene with [η3-EDBP)Li2]2[(η3-nBu)Li(0.5Et2O)]2 and L-lactide in an organic solvent preferably CH2Cl2 to form the poly(styrene)-poly(L-lactide) chiral block copolymer. Transmission electron microscopy (TEM) and small X-ray scattering (SAXS) studies show that when the volume fraction of poly(L-lactide) is about 35–37%, nanoscale helices with a pitch of 43.8 nanometers and a diameter of 34.4 nanometers were observed.
摘要翻译:一种制备一系列纳米级微观结构的方法,包括螺旋微结构和圆柱形微结构。 该方法包括以下步骤:(1)形成含有多个手性第一聚合物嵌段的手性嵌段共聚物和第二聚合物嵌段,其中手性第一聚合物嵌段具有20至49%的体积分数; (2)引起手性嵌段共聚物中的相分离。 在优选的实施方案中,手性嵌段共聚物是聚(苯乙烯) - 聚(L-丙交酯)(PS-PLLA)手性嵌段共聚物,共聚方法是一种活性共聚方法,其包括以下步骤:(a) 用BPO和4-OH-TEMPO形成4-羟基-TEMPO封端的聚苯乙烯; 和(2)将4-羟基-TEMPO封端的聚苯乙烯与[η3 -EDBP] Li 2 N 2 [2] 优选的有机溶剂中的L 3→N 2→Bu)Li(0.5E 2 O 2)2 N 2和L-丙交酯 CH 2 2 Cl 2以形成聚(苯乙烯) - 聚(L-丙交酯)手性嵌段共聚物。 透射电子显微镜(TEM)和小X射线散射(SAXS)研究表明,当聚(L-丙交酯)的体积分数为约35-37%时,具有43.8纳米的间距和34.4纳米的直径的纳米级螺旋 被观察到。
摘要:
A nanopatterned template for use in manufacturing nanoscale objects. The nanopatterned template contains a nanoporous thin film with a periodically ordered porous geomorphology which is made from a process comprising the steps of: (a) using a block copolymerization process to prepare a block copolymer comprising first and second polymer blocks, the first and second polymer blocks being incompatible with each other; (b) forming a thin film under conditions such that the first polymer blocks form into a periodically ordered topology; and (c) selectively degrading the first polymer blocks to cause the thin film to become a nanoporous material with a periodically ordered porous geomorphology. In a preferred embodiment, the block copolymer is poly(styrene)-poly(L-lactide) (PS-PLLA) chiral block copolymer, the first polymer is poly(L-lactide), and the second polymer is polystyrene. Experimental results show that the first polymer blocks can be formed into a hexagonal cylindrical geomorphology with its axis perpendicular to a surface of the thin film. After hydrolysis to selectively degrade the first polymer blocks, a thin film having a series of repeated nanoscale hexagonal-cylindrical channels is obtained.
摘要:
Metal nanodot arrays and fabrication methods thereof. A film of a block copolymer is deposited on a conductive substrate. The block copolymer comprises first polymer and second polymer blocks, wherein the first polymer blocks have a periodically ordered morphology. The first polymer blocks are selectively degraded to form a nanopatterned template comprising periodically ordered nanochannels. By electroplating, metal is deposited into the nanochannels that expose the conductive substrate, thus forming a metal nanodot array.
摘要:
A fabrication method of a nanomaterial by using a polymeric nanoporous template is disclosed. First, a block copolymer bulk is made from a block copolymer polymerized from decomposable and undecomposable monomers. By removing the decomposable portion of the block copolymer bulk, the polymeric nanoporous template with a plurality of holes is obtained, and these holes have nanostructures with regular arrangement. By exploiting a nanoreactor concept, a sol-gel process or an electrochemical synthesis, for example, is then carried out within the template such that the holes are filled with various filler materials, such as ceramics, metals and polymers, so as to prepare a nanocomposite material having the nanostructure. After removing the polymeric nanoporous template, the nanomaterial with the nanostructure is manufactured.
摘要:
Nanoporous polystyrene matrix can be fabricated from the self-assembly of degradable block copolymer, polystyrene-b-poly(L-lactide) (PS-PLLA), followed by the hydrolysis of PLLA blocks. Metal is deposited in nanopores of the PS matrix using the nanoporous PS as a template via electroless plating. After subsequent UV degradation of the PS matrix, metal in the nanopores remains, yielding a metal nanostructure. The metal nanostructure may be a gyroid nanostructure, helical nanostructure or columnar nanastructure.
摘要:
Nanoporous polymers with gyroid nanochannels can be fabricated from the self-assembly of degradable block copolymer, polystyrene-b-poly(L-lactide) (PS-PLLA), followed by the hydrolysis of PLLA blocks. A well-defined nanohybrid material with SiO2 gyroid nanostructure in a PS matrix can be obtained using the nanoporous PS as a template for the sol-gel reaction. After subsequent UV degradation of the PS matrix, a highly porous inorganic gyroid network remains, yielding a single-component material with an exceptionally low refractive index (as low as 1.1).
摘要:
Nanoporous polymers with gyroid nanochannels can be fabricated from the self-assembly of degradable block copolymer, polystyrene-b-poly(L-lactide) (PS-PLLA), followed by the hydrolysis of PLLA blocks. A well-defined nanohybrid material with SiO2 gyroid nanostructure in a PS matrix can be obtained using the nanoporous PS as a template for the sol-gel reaction. After subsequent UV degradation of the PS matrix, a highly porous inorganic gyroid network remains, yielding a single-component material with an exceptionally low refractive index (as low as 1.1).