Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA.
Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA.
Angew Chem Int Ed Engl. 2021 Apr 12;60(16):8710-8716. doi: 10.1002/anie.202016384. Epub 2021 Mar 8.
Ultra-low molecular weight disaccharide-polyolefin conjugates with cellobiose, lactose and maltose head groups and atactic polypropene tails, such as 1, undergo a series of irreversible thermotropic order-order transitions with increasing temperature to provide nanostructured phases in the sequence: lamellar (L), hexagonal perforated lamellar (HPL), double gyroid (DG) and hexagonal cylindrical (C). The DG phase displays exceptional stability at ambient temperature and features two interpenetrating sugar domain networks having a sub-2-nm strut width and a lattice parameter, a , of 13.1 nm. The unique stability of this DG phase extends further within ultrathin films all the way down to the two-dimensional limit of 15 nm in which film thickness, l, is now less than the surface-oriented unit cell height, h . In addition to raising the fundamental question of what minimally constitutes a Schoen triply periodic minimal surface and DG lattice, these results serve to establish the class of sugar-polyolefin conjugates as a new material platform for nanoscience and nanotechnology.
超支化低分子量二糖-聚烯烃缀合物，具有纤维二糖、乳糖和麦芽糖的头基和无规聚丙烯的尾基，例如 1，随着温度的升高经历一系列不可逆的热致有序-无序转变，提供了一系列纳米结构相：层状（L）、六方穿孔层状（HPL）、双回旋体（DG）和六方柱状（C）。DG 相在环境温度下表现出异常的稳定性，具有两个相互贯穿的糖域网络，其支柱宽度和晶格参数 a 分别为 2nm 和 13.1nm。这种 DG 相的独特稳定性在超薄薄膜中进一步延伸，一直延伸到二维极限 15nm，其中薄膜厚度 l 现在小于面向表面的单元高度 h。除了提出什么是最小 Schoen 三重周期性极小曲面和 DG 晶格的基本问题外，这些结果还证明了糖-聚烯烃缀合物类是纳米科学和纳米技术的一种新的材料平台。
