纸张涂布用沉淀碳酸钙的研制

以有机酸或其盐做添加剂，采用常压碳化法制成了沉淀碳酸钙。该产品是一种平均粒径在０．８～１．Ｏ微米之间的具有针柱状晶形结构的白色粉末，具有粒度均一、白度高、遮盖力强、分散性能良好等特点，可制做高浓度低粘度料浆，适用于做纸张涂布颜料。     

海藻酸盐纤维面膜基材的制备与性能研究

用海藻酸钙纤维分别与竹纤维、天丝纤维、棉纤维等混合后制备水刺无纺布,测试了各种无纺布面膜基材在含有透明质酸钠、羧甲基纤维素钠、羧甲基甲壳胺、聚乙烯醇等水溶液的吸液率,以及对水溶液中铜离子、铅离子的吸附性能。结果显示,海藻酸盐面膜基材的吸液率受精华液中阴离子含量的影响,加入透明质酸钠、羧甲基纤维素钠、羧甲基甲壳胺等阴离子型水溶性高分子可有效提高面膜的吸液率、改善面膜的保湿性能。海藻酸钙纤维对铜离子和铅离子有很强的吸附性能,使用在皮肤上可吸收皮肤中的重金属离子,在功能性面膜领域有很高的应用价值。     

Synthesis and Evaluation of AlgNa-g-Poly(QCL-co-HEMA) Hydrogels as Platform for Chondrocyte Proliferation and Controlled Release of Betamethasone

Hydrogels obtained from combining different polymers are an interesting strategy for developing controlled release system platforms and tissue engineering scaffolds. In this study, the applicability of sodium alginate-g-(QCL-co-HEMA) hydrogels for these biomedical applications was evaluated. Hydrogels were synthesized by free-radical polymerization using a different concentration of the components. The hydrogels were characterized by Fourier transform-infrared spectroscopy, scanning electron microscopy, and a swelling degree. Betamethasone release as well as the in vitro cytocompatibility with chondrocytes and fibroblast cells were also evaluated. Scanning electron microscopy confirmed the porous surface morphology of the hydrogels in all cases. The swelling percent was determined at a different pH and was observed to be pH-sensitive. The controlled release behavior of betamethasone from the matrices was investigated in PBS media (pH = 7.4) and the drug was released in a controlled manner for up to 8 h. Human chondrocytes and fibroblasts were cultured on the hydrogels. The MTS assay showed that almost all hydrogels are cytocompatibles and an increase of proliferation in both cell types after one week of incubation was observed by the Live/Dead^® assay. These results demonstrate that these hydrogels are attractive materials for pharmaceutical and biomedical applications due to their characteristics, their release kinetics, and biocompatibility.     

A Carbodiimide Cross-Linked Silk Fibroin/Sodium Alginate Composite Hydrogel with Tunable Properties for Sustained Drug Delivery

Carbodiimide cross-linked silk fibroin (SF)/sodium alginate (SA) composite hydrogels with superior stability and tunable properties are developed by varying preparation parameters. SF/SA blend ratio modulation allows to achieve composite hydrogel gelation times of 18–65 min, and rheological analysis shows that the speed of gel formation, the hydrogel network's density, and the hydrogels’ compressive properties are closely related to the blend ratio. The G′ of different hydrogels varies substantially from 28 to 413 Pa, and the hydrogel with higher SF content has a greater stiffness. The composite hydrogels present appropriate porosity of 76.63–85.09% and pore size of 316–603 µm. Hydrogel stability improves significantly after cross-linking, and substantial swelling occurs due to the hydrophilicity of SA. The 7/3 and 6/4 SF/SA hydrogels are more resistant to degradation in PBS, and cytotoxicity testing confirmed their biocompatibility. For release studies in vitro, two model compounds are used as drug models, tetracycline hydrochloride, and bovine serum albumin (BSA). Different ratios of SF/SA have a greater influence on the release of BSA. This study provides a practical preparation method for flexible SF/SA composite hydrogels, which can help design hydrogels with specific physicochemical properties for different applications, especially drug delivery.     

烟气脱硫产物-亚硫酸钙非催化氧化的宏观反应动力学研究

湿法脱硫工艺中，副产物-CaSO3的氧化是影响SO3的脱除效率的关键因素之一，其研究有重要意义。该文利用实验装置，通过改变pH值、亚硫酸钙浓度、空气流量、温度等条件，研究了亚硫酸钙非催化氧化的宏观反应动力学，实验参数较接近实际工况条件。通过一系列合理的假设建立了亚硫酸钙非催化氧化的总反应过程的数学模型，包括本征化学反应、亚硫酸钙溶解和氧的传质扩散等3个步骤。结合实验结果，得到在实验条件下，总反应速率受氧的扩散传质控制的结论，为湿式脱硫工艺的设计提供了理论参考。     

燃煤固体产物中含钙矿物的迁移与多相反应

燃煤灰渣中含钙矿物的组成和多相反应与灰渣活性密切相关。该文对SBF试验台上煤粉与添加剂混烧后的灰样进行XRD分析，并采用F^*A^^C^*T软件包对煤和添加剂组成的多组分系统进行热力学计算，探讨了不同条件下灰渣中含钙矿物的组成特性。结果表明，燃煤灰渣中含钙矿物主要参与固相反应和固硫反应，固相反应生成的含钙矿物主要包括CaO-SiO2、CaO-Al2O3、CaO-Fe2O3以及CaO-SiO2-Al2O3类矿物。随着CaO含量的增加，灰渣中生成的最主要矿物从莫来石→钙长石→钙黄长石→硅酸二钙过渡。在CaSO4稳定存在的温度范围内，固硫反应比固相反应更易进行：随着温度的升高，CaSO4发生分解或者进一步反应生成硫铝酸钙或硫硅酸钙从而使得钙向硅酸盐矿物迁移。     

海藻酸钠的提取及应用

海藻酸钠作为一种天然高分子物质已被广泛应用.介绍了海藻酸钠的性质、研究现状和几种提取工艺,综述了其在医学和食品行业中的应用,并对其发展前景作了展望.     

氨基酸钙对灵芝生长及代谢产物合成的影响

研究了氨基酸钙对灵芝生长和代谢产物合成的影响,考察了灵芝生物量、多糖、氨基氮和活性钙的变化。结果显示,在培养液中添加200μg/g的氨基酸钙能够增加生物量和代谢产物的产率;灵芝的生物量、活性钙、多糖和氨基氮分别提高了37.50%,189.61%,37.76%和50.00%;当氨基酸钙的浓度高于400μg/g时,对灵芝的生物和代谢产物的合成有抑制作用。     

基于表面生物学改性的钛合金微弧氧化陶瓷层研究

采用微弧氧化法于（CH3COO）2Ca-CaC3H5（OH）2PO4溶液中制备了富含Ca、P成分的钛合金微弧氧化陶瓷层,研究了陶瓷层中的相结构、Ca和P的分布、电压与电流密度对Ca和P在膜层中分布的影响。结果表明,陶瓷层主要由金红石型和锐钛矿型TiO2及非晶相组成;沿膜层由表及里,Ca在膜层的含量分布呈现类似二次曲线递减趋势,P在膜层中的含量则大体均匀,但在膜基交界面迅速降为零。随着电压或电流密度的升高,膜层中Ca、P相对含量增大,Ca的增长速度远快于P,使得Ca、P的摩尔比随电压的升高而增大。     

Polyelectrolyte complexes of sodium alginate with chitosan or its derivatives for microcapsules

Chitosan, a cationic polysaccharide, was heterogeneously deacetylated with a 47% sodium hydroxide solution and followed by a homogeneous reacetylation with acetic anhydrides to control the N-acetyl content of the chitosan having a similar molecular weight. The chitosans having different degrees of N-acetylation were complexed with sodium alginate, an anionic polysaccharide, and the formation behavior of polyelectrolyte complexes (PECs) was examined by the viscometry in various pH ranges. The maximum mixing ratio (R_max) increased with a decrease in the degree of N-acetylation of the chitosan at the same pH, and with a decrease in pH at the same degree of N-acetylation. Similarly, N-acylated chitosans were also prepared. The N-acyl chitosans scarcely affected the formation behavior of PECs with sodium alginates. For the application of the PECs produced, the microencapsulation of a drug was performed and the release property of drug was tested. The microcapsules were prepared in one step by the extrusion of a solution of guaifenesin and sodium alginate into a solution containing calcium chloride and chitosan through interpolymeric ionic interactions. The drug release during the drug-loaded microcapsules storage in saline was found to depend on the pH where the microcapsules were formed and the kind of N-acyl groups introduced to the chitosan. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 425–432, 1997