纳米碳酸钙原位改性竹纤维表面性能的研究
Effects of in situ deposited calcium carbonates nanoparticles on surface performance of bamboo fibers.
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摘要: 采用离子溶液反应法将碳酸钙沉积到竹纤维上，研究在不同浓度氯化钙溶液下的碳酸钙原位沉积情况及其对单根竹纤维表面形貌、粗糙度及润湿性等性能的影响。结果表明：随着氯化钙溶液浓度的增大，碳酸钙吸附量呈上升趋势，从0.97%增至12.3%；碳酸钙由分散性较好的不规则四面体单晶逐渐团聚生长为球形或椭球形，单晶为60 nm左右；附着的碳酸钙颗粒改变了纤维的表面粗糙度和浸润性能；不同水平间改性纤维的表面粗糙度和静态接触角存在显著差异，氯化钙溶液浓度为0.3 mol/L时，单根竹纤维的表面粗糙度值达到最大、静态接触角最小。Abstract: The article applies a twostep ironic solution reaction to in situ deposit calcium carbonate nanoparticles onto bamboo fibers. The distributions of calcium carbonate nanoparticles at different molarities of calcium chloride ironic solutions and their effects on surface performances of bamboo fibers were investigated, involving surface topography, wetting properties and surface roughness. The results showed that calcium carbonate adsorbances rose from 0.97% to 12.3% and the morphology of calcium carbonate crystals changed from the single, irregularly tetrahedral nanoparticles to spheroplasts or axiolitic particles, as molarities of calcium chloride ironic solutions increased. The size of single crystal was around 60 nm. Calcium carbonate crystals, which filled the micropores of bamboo fibers, were responsible for distinct variances of surface roughness and wetting properties of modified fibers under different molar concentration levels. The average Rq value (234.38) of the treated individual bamboo fibers at the molarity of 0.3 mol/L was at the peak, the average static contact angle of which reached the lowest point of 64.00°.
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