Jeffrey Lancaster

Columbia University Libraries · Science & Engineering Libraries

This report demonstrates the electroless deposition of Ni onto micropatterns of poly (acrylic acid) (PAA) photografted to phthalimide-terminated self-assembled monolayers (SAMs). PAA is spin-coated onto phthalimide SAMs and covered with a photomask. UV irradiation selectively binds PAA to exposed regions of the surface, allowing PAA on unexposed re...

In one aspect, the present invention is directed to dendrimers comprised of macromolecules and trifunctional branches. In another aspect, the invention relates to methods for generating dendrimeric compositions comprising macromolecules and trifunctional branches. In certain embodiments, the radial density of the dendrimeric composition is controll...

Small molecules representing common synthetic polymers were subjected to photochemically-induced hydrogen abstraction by benzophenone. Reactions were monitored using (1) H NMR to query the factors that influence preferential abstraction of protons in unique chemical environments. Differences in bond dissociation energies do not fully explain the ob...

The present invention relates to functionalizing a surface of an organic material. For example, surfaces of materials having C—H bonds, such as polymers having C—H bonds, can be functionalized. In certain embodiments, a heterobifunctional molecule having a photoactive anchor, a spacer, and a terminal functional group is applied to the surface of an...

The general mechanism for photo-cross-linking of preformed polymers is studied by comparing the efficacy of monofunctional benzophenone (BP) and bifunctional bis-benzophenone (BP-BP) photoinitiators for inducing radical chain branching reactions in glassy polystyrene (PS) and rubbery poly(n-butyl acrylate) (PnBA). Upon UV irradiation, macroradicals...

The cycloadducts of tethered naphthalene and anthracene derivatives undergo photochemical ring opening to an electronically excited product with adiabatic yields up to 90%.

The quantitative and qualitative kinetics of molecular bridging through hydrogen extraction from the tertiary carbon in Polymer backbones are explored through HPLC with MALLS in 300nm films of Polystyrene, Poly(n-butyl acrylate), and other polymers above and below the glass transition temperature. Changes in molecular weight distribution and the ap...

The Nobel Laureate Meetings held on the German island of Lindau bring together some of the world's brightest young minds with those individuals who have reached a pinnacle of scientific achievement. The impact of this unique event on all the delegates - especially the young researchers - is far-reaching.

193 immersion lithography has reached its maximal achievable resolution. There are mainly two lithographic strategies that will enable continued increase in resolution. Those are being pursued in parallel. The first is extreme ultraviolet (EUV) lithography and the second is double patterning (exposure) lithography. EUV lithography is counted on to...

We show that bis-benzophenone (bis-BP) is an effective method to photochemically crosslink essentially any solvent-free glassy or amorphous preformed polymer system that contains abstractable hydrogen atoms. When bis-BP is mixed into a polymer and exposed to UV radiation, it abstracts hydrogen atoms from any chains in proximity, thereby initiating...

The bimolecular quenching rate constants of singlet oxygen ((1)O2) by cubane and cubane derivatives were determined and found to be in the order of 10(3)-10(4) M(-1) s(-1). These values represent larger values than expected for aliphatic alkanes as a model for C-H vibrational deactivation. This result is explained by the occurrence of two different...

The design of a sequential two photon photoacid generator for double exposure (DE) photolithography was demonstrated. The proposed design composed of a photochemically inactive photoacid generator and a latent/inactive sensitizer. The photochemical photoacid generator was designed to be transparent to the lithographic light under the deep UV. Photo...

A study was conducted to demonstrate a method of patterning metals on a polymer. It was demonstrated that the method utilizes a diblock copolymer that incorporates a photoactive sequence, which self-assembles at the surface of the polymeric substrate. It was found that the design of the diblock copolymer is simple and the first sequence is based on...

The laser-induced fluorescence and action spectra of I2 in a helium supersonic expansion have been recorded in the I2 B–X, 20–0 region. Two features are identified within the spectra. The lower-energy feature arises from transitions between states that are localized in a T-shaped conformation on both the X- and B-state potentials. The higher-energy...