Generating laterally ordered, ultradense, macroscopic arrays of nanoscopic elements will revolutionize the microelectronic and storage industries. We used faceted surfaces commercially available sapphire wafers to guide self-assembly block copolymer microdomains into oriented with quasi–long-range crystalline order over arbitrarily large wafer surfaces. Ordered cylindrical 3 nanometers in diameter, areal densities excess 10 terabits per square inch, were produced. The sawtoothed substrate...

The morphologies of a poly(1,4-isoprene)-block-polystyrene-block-poly(2-vinyl pyridine) (IS2VP) copolymer were investigated using resonant soft X-ray scattering (RSoXS) together with scanning force microscopy, small-angle scattering, and electron microscopy. Differences in the nanoscopic bulk thin film samples observed arising from competition between segmental interactions blocks substrate surface energies each block. Using X-rays at selected photon to isolate contribution different polymer...

We report a type of device that combines vertical arrays one-dimensional (1D) pillar-superlattice (PSL) structures with 2D graphene sheets to yield class light emitting diode (LED) interesting mechanical, optical, and electrical characteristics. In this application, coated very thin metal layers exhibit good mechanical properties an ability mount, in freely suspended configuration, on the PSL as top window electrode. Optical characterization demonstrates exhibits excellent optical...

Three polystyrene-block-poly(2-vinylpyridine) (S2VP diblock) and three polystyrene-block-poly(4-vinylpyridine) (S4VP copolymers with varying molecular weights block compositions were synthesized via anionic polymerization, their order−disorder transition temperatures (TODTs) determined using oscillatory shear rheometry small-angle X-ray scattering (SAXS). It has been found that for comparable weight composition the TODT of S4VP diblock copolymer is exceedingly high compared S2VP copolymer....

We report on the fabrication and optical characterization of dense ordered arrays metal nanoparticles. The are produced by reducing salts in block copolymer (BCP) templates made solvent annealing poly(styrene-b-4-vinylpyridine) (PS-b-P4VP) or poly(styrene-b-ethylene oxide) (PS-b-PEO) diblock thin films mixed solvents. gold gold/silver composite nanoparticle show characteristic surface plasmon resonances visible wavelength range. patterning can be applied over large areas onto various...

A simple, versatile approach to the directed self-assembly of block copolymers into a macroscopic array unidirectionally aligned cylindrical microdomains on reconstructed faceted single crystal surfaces or flexible, inexpensive polymeric replicas was discovered. High fidelity transfer line pattern generated from master mold is also shown. single-grained patterns over arbitrarily large surface areas without use top-down techniques demonstrated, which has an order parameter typically in excess...

Mixtures of polystyrene-block-poly(methyl methacrylate) (PS−PMMA) having PMMA cylindrical microdomains with homopolymers and poly(ethylene oxide) (PEO) were used to study the effect interaction between confined PS matrix on microdomain spacing mixtures. The in all thin films are oriented perpendicular film surface. It was found that miscibility homopolymer block enhanced compared bulk at a given molecular weight homopolymer. Also, chains more localized center than bulk, which results larger...

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTSwelling and Shrinkage of Lamellar Domain Conformationally Restricted Block Copolymers by Metal ChlorideDong Hyun Lee, Hwang Yong Kim, Jin Kon June Huh, Du Yeol RyuView Author Information National Creative Research Center for Copolymer Self-Assembly, Department Chemical Engineering Polymer Institute, Pohang University Science Technology, Kyungbuk 790-784, Korea School Materials Engineering, Seoul University,...

The effective interaction parameters, (χF) of the homologous series deuterated polystyrene-block-poly(n-alkyl methacrylate) copolymers (dPS-b-PAnMA) from methyl (n = 1) to hexyl 6) side groups have been investigated by small-angle neutron scattering and a Hartree (fluctuation correction) analysis. While χF for dPS-b-PAnMA with n 1 6 is typical decreasing function temperature, it shown that 2 4 changes monotonic increase revealing growing upward convexity. This action culminates in maximum 5,...

In this study, we demonstrate extremely aligned one-dimensional (1D) nanostructures in a large area by using directed self-assembly (DSA) of block copolymers (BCPs) thin films on unique topographic patterns poly(tetrafluoroethylene) (PTFE). Unidirectionally PTFE are first fabricated physically rubbing flat Si surface at high temperatures close to its melting points (Tm). The cylinder-forming polystyrene-block-poly(2-vinylpyridine) (S2VPs) spin-coated directly the patterns, followed...

The phase behavior of deuterated polystyrene-block-poly(n-pentyl methacrylate) copolymers (dPS−PnPMA) was investigated by using small-angle X-ray (SAXS) and neutron (SANS) scatterings rheology. This block copolymer exhibited a closed-loop type as did hydrogenated PS−PnPMA copolymers. closed loop consists two transitions: lower disorder-to-order transition (LDOT) upper order-to-disorder (UODT) occurring at higher temperature, respectively. segmental interaction parameter (χ) between dPS PnPMA...

The effect of cadmium chloride (CdCl2) on the phase behavior polystyrene-block-poly(4-vinylpyridine) copolymer (S4VP) was investigated by using rheometry, small-angle X-ray scattering, and transmission electron microscopy. For this purpose, symmetric S4VPs with various molecular weights were prepared anionic polymerization. We found that addition CdCl2 order-to-disorder transition S4VP significantly increased because intermolecular coordination connecting different P4VP block chains. also...

Silica nanoporous templates from poly(1,4-isoprene)-block-polystyrene-block-poly(2-vinyl pyridine) (IS2VP) were prepared. The films of IS2VP spin-coated toluene showed a dimple-type structure with short-range lateral order. When the exposed to mixed solvent vapor toluene/hexane, highly ordered and oriented core−shell structure, consisting an outer shell PI, middle PS, core P2VP, was obtained. PI degraded by UV-ozone treatment removed. A film polydimethylsiloxane (PDMS) spin coated onto...

The effect of a faceted surface geometry on controlling the direction well-defined line patterns block copolymer (BCP) microdomains over macroscopic areas is reported. Facets with asymmetric base angles can control BCP oriented either parallel or perpendicular to facets depending film thickness.

The phase behavior of polystyrene-block-poly(n-pentyl methacrylate) copolymers [PS−PnPMA] having various block length ratios was investigated by rheology, transmission electron microscopy (TEM), and small-angle X-ray scattering (SAXS). All the PS−PnPMA exhibited two transitions: lower disorder-to-order transition (LDOT) upper order-to-disorder (UODT) occurring at a higher temperature, respectively. Thus, is characterized closed-loop type behavior. As volume fraction PS in decreased from 0.5...

A simple route is demonstrated to fabricate highly ordered and oriented arrays of PS-b-PEO block copolymer microdomains on inexpensive, flexible polymeric substrates where the lateral ordering same as that seen hard master surfaces. The thin films well-developed onto can be used templates or scaffolds a wide range nanostructured materials for devices. Detailed facts importance specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited...

Simple yet versatile routes to generate macroscopically aligned 3-D NP arrays with tunable structures in supramolecular nanocomposite thin films are presented using faceted and lithographically patterned surfaces. These studies provide a powerful platform for the investigation of emerging structure–property relationships functional nanocomposites, paving way realization next-generation devices. As service our authors readers, this journal provides supporting information supplied by authors....

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTComplex Phase Behavior of a Weakly Interacting Binary Polymer BlendDu Yeol Ryu, Dong Hyun Lee, Jin Jang, Kon Kim, Kristopher A. Lavery, and Thomas P. RussellView Author Information National Creative Research Initiative Center for Block Copolymer Self-Assembly Department Chemical Engineering, Electronic Computer Engineering Divisions, Pohang University Science Technology, Kyungbuk 790-784, Korea Department,...

We present a simple, versatile approach to generate highly ordered nanostructures of block copolymers (BCPs) using rubbed surfaces. A poly(tetrafluoroethylene) (PTFE) was dragged across flat substrate surface above the melting point PTFE transferring aligned topographic pattern substrate. Si wafer, glass, and polyimide films were used as substrates. Thin cylinder-forming asymmetric polystyrene-block-poly(2-vinylpyridine) (S2VPs) solvent annealed on surfaces having transferred induce their...

Displacement mapping is a computer graphics technique that enables the design of components with regularly or randomly textured surfaces can be quickly materialized on three-dimensional (3D) printer when needed. This approach is, in principle, more flexible, faster, and economical compared to conventional texturing methods, but accuracy texture depends heavily parameters used. The purpose this study demonstrate how produce surface-textured part using polygonal (mesh) modeling software...

Polystyrene-block-poly(n-butyl methacrylate) copolymer (PS-b-PnBMA) exhibits only a lower disorder-to-order transition (LDOT), not closed-loop phase behavior, within an experimentally accessible temperature range. But, when mixed solvents of di-n-octyl phthalate and hexadecane were added to PS-b-PnBMA, this mixture exhibited the upper order-to-disorder (UODT) below degradation as well LDOT above glass temperatures both blocks; thus, close-loop behavior was observed. These results suggest...

The phase behavior of polystyrene and poly(n-pentyl methacrylate) (PS/PnPMA) blends with small amounts symmetric PS-block-PnPMA copolymer (PS-b-PnPMA) was studied by turbidity, light scattering, small-angle neutron scattering (SANS). At ambient pressure, PS/PnPMA lower molecular weights exhibited both the upper critical solution transition (UCST) (LCST), increasing PS, an hourglass type observed. When a very amount (∼0.5 wt %) PS-b-PnPMA is added to blend, LCST increases but UCST decreases....