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커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Small-angle neutron scattering (SANS) experiments were conducted in this study to investigate the structure and stability of a neutral lamellar phase. This phase consists of Triton X<sub>100</sub> (TX<sub>100</sub>) as the primary surfactant, Triton X<sub>35</sub> (TX<sub>35</sub>) as the co-surfactant, and water. To prepare samples within the lamellar phase region, the mass ratio was fixed at <i>Ω</i> = TX<sub>35</sub>/TX<sub>100</sub> = 1.26. All scattered intensities, <i>I</i>(<i>q</i>), were fitted using the Nallet model, which provides insight into the spatial arrangement of membranes in the system. We first focused on the effect of the volume fraction <i>ϕ</i> on the structure and stability of the lamellar phase. Subsequently, a cationic surfactant, cetylpyridinium chloride (CpCl), was added at a fixed concentration of <i>Γ</i> = 1% to samples with different volume fractions in order to assess the influence of introducing charges on the lamellar structure. Finally, a telechelic polymer, polyethylene oxide modified with hydrophobic alkyl (dodecyl) groups at both chain ends (denoted PEO-2m), was incorporated at a fixed concentration of <i>Ψ</i> = 10% into samples of various volume fractions. The results reveal that neither the variation of the volume fraction nor the addition of charges or PEO-2m alters the phase type: all samples remain in the lamellar phase. However, the internal structure is strongly affected. At low volume fractions (<i>ϕ</i> = 5% and <i>ϕ</i> = 10%), the membranes are disordered and lack a well-defined lamellar arrangement, whereas at higher volume fractions (<i>ϕ</i> = 20% and <i>ϕ</i> = 30%), they adopt an ordered state typical of a well-organised lamellar structure. The introduction of charges or PEO-2m significantly enhances the structural order: a well-defined lamellar phase is obtained even at low volume fractions (<i>ϕ</i> = 5% and <i>ϕ</i> = 10%) in the presence of charges, and at <i>ϕ</i> = 10% when PEO-2m is added.
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