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動的核スピン偏極法と中性子小角散乱法を用いたソフトマター試料のメソスケール構造研究

Study of meso-scale structure of soft-matter materials using dynamic nuclear polarization and small-angle neutron scattering

熊田 高之   ; 能田 洋平; 橋本 竹治; 小泉 智

Kumada, Takayuki; Noda, Yohei; Hashimoto, Takeji; Koizumi, Satoshi

軽水素核に対する中性子散乱能は、両者のスピンの相対向きに強く依存する。ソフトマター試料の中性子散乱法実験を行ううえで、入射中性子及び試料中の水素核スピン双方を操ることで、多元的の中性子散乱パターンを得ることが可能となり、より詳細な構造因子が決定できるようになる。われわれは動的核スピン偏極(DNP)法により核スピン偏極したポリエチレン試料の、偏極中性子による散乱パターンを測定し、核偏極による散乱パターンへの影響を調べた。

We carried out small-angle neutron scattering (SANS) study of dynamically proton-spin polarized polyethylenes (PE) doped with TEMPO. Coherent scattering profiles, which reflect crystalline domain structures in PE samples, were kept unchanged by the proton polarization, but their intensities increased by 3 or 6 at P = +0.26 and -0.26, respectively. The increase is only 1/13 of theoretical prediction on the assumption that polarization is homogeneous through the PE sample. This result suggests that P in amorphous parts of PE, where TEMPOs were localized and dynamic nuclear polarization (DNP) took place, should be higher than that in crystalline parts by 0.03.

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