Smooth model cellulose I surfaces from nanocrystal suspensions
Smooth model cellulose I surfaces from nanocrystal suspensions
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DOI：
10.1023/a:1027333928715
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发表时间：
2003-12-01
期刊：
影响因子：
5.7
通讯作者：
Gray, DG
中科院分区：
文献类型：
--
作者：
Edgar, CD;Gray, DG
在制浆过程中，去除木质素，半纤维素和其他次要成分会导致多孔的纤维结构。纤维素纤维表面与湿末端添加剂和其他材料的相互作用既取决于纤维素的界面特性，也取决于表面的形态。能够通过制备平坦的纤维素表面将与纤维素的相互作用与依赖表面粗糙度和孔隙率的相互作用分开是有用的。当前方法给出了无定形纤维素或纤维素II的表面，与原始纤维素I表面的密度和结晶度不同。我们提出了一条新的途径，以从纤维素I纳米晶体的胶体分散体开始，准备纤维素I的光滑模型表面。这些棒状胶体颗粒的压力计尺寸宽度可通过在适当的表面上施放水性悬浮液并使水蒸发来制备相对平坦的表面。可以通过旋涂或剪切制备定向的膜。通过X射线光电子光谱和原子力显微镜检查膜的表面组成和形态。
Removal of lignin, hemicelluloses and other minor components during pulping results in a porous fibrillar structure. Interactions of cellulose fibre surfaces with wet-end additives and other materials depend both on the interfacial properties of the cellulose and on the morphology of the surface. It would be useful to be able to separate the interactions with the cellulose from those that depend on surface roughness and porosity by preparing flat cellulose surfaces. Current methods give surfaces of amorphous cellulose or of cellulose II, differing in density and crystallinity from the original cellulose I surface. We propose a new route to prepare smooth model surfaces of cellulose I, starting from colloidal dispersions of cellulose I nanocrystals. The manometer-sized width of these rod-like colloidal particles allows a relatively flat surface to be prepared from the suspension by casting an aqueous suspension on an appropriate surface and allowing the water to evaporate. Oriented films can be prepared by spin-coating or shearing. The surface composition and morphology of the films were examined by X-ray photoelectron spectroscopy and atomic force microscopy.