磁性疏水性纤维素纳米纤丝气凝胶的制备及性能研究

以TEMPO氧化法制备的纤维素纳米纤丝（CNF）为原料制备CNF气凝胶,随后采用Fe₃O₄纳米粒子和十六烷基三甲氧基硅烷（HDTMS）对其进行改性制得磁性疏水性CNF气凝胶,并对其疏水性能、磁性、吸附性及其他各项性能进行表征。结果表明,交联剂N,N-亚甲基双丙烯酰胺（MBA）可提高CNF之间的结合强度,使气凝胶结构更加稳定、不易被破坏。制备得到的气凝胶密度和孔隙率分别为0.015 g/cm³和99.02%,其水接触角可达133°,表现出优异的超疏水性,吸附倍率最高可达145 g/g（机油）;同时,添加Fe₃O₄纳米粒子使气凝胶具备较好的磁响应性能,有利于气凝胶的后期回收。     

离子凝胶的制备及其用于柔性应变传感器的研究

利用氯化胆碱-丙烯酰胺合成的低共熔溶剂（DES）与α-硫辛酸、微晶纤维素之间的共价键、离子键和高密度氢键的网络结构,形成了稳定、高黏附性、机械性能优异的离子凝胶。研究发现,制备的离子凝胶具有理想的黏附性（对玻璃的黏附力达69.3 kPa）、良好的自愈性（10 s可恢复到最大应力的41%）、优异的导电性（8.1×10-4 S/cm）和抗紫外性能（100%紫外线阻挡能力）。同时,该离子凝胶在不同材料和形状的基底上具有较好的黏附性,且在人体皮肤上具有很高的黏合性。基于该离子凝胶所组装成的柔性应变传感器可用于监测不同动作的相对电阻信号变化,并且表现出持续且稳定的信号。     

超高分子量聚乙烯/聚苯胺导电针织物的应变传感性能

为制备超高分子量聚乙烯/聚苯胺复合导电纱线,以超高分子量聚乙烯长丝纱为基材,对其采用常压等离子体预处理后,进行基于原位聚合的纱线连续导电处理。利用制得的复合导电纱线制备了圆筒状纬平针织物作为应变传感器,研究了传感织物的应变-电阻传感性能。结果表明:导电针织物表现出明显的应变-电阻传感性能,其电阻随应变的增大先增大,至一定值后随着应变的增大而减小;传感织物具有较高的敏感度,在应变小于20%时,其传感因子可达30以上;多次拉伸时,传感织物的传感重复性逐渐提高,拉伸3次以后,传感织物表现出良好的传感重复性。     

纳米纤维素乳化苯乙烯-丙烯酸酯共聚物的制备及性能研究

本研究分别使用纤维素纳米纤丝（CNF）和纤维素纳米晶体（CNC）乳化苯乙烯-丙烯酸酯（SA）单体,以过硫酸铵（APS）为引发剂,通过自由基聚合得到共聚物PSA,并对其各项性能及力学性能增强机理进行研究。结果表明,纳米纤维素在PSA的制备过程中发挥了界面活性剂和功能性填料的双重作用。其中,CNF-PSA乳液稳定性强但黏度较高,CNC-PSA乳液则兼具高稳定性和低黏度的特性。由CNF、CNC和十二烷基硫酸钠（SDS）乳化后聚合得到的PSA共聚物转化率分别为76.32%、78.28%和82.62%。红外光谱和热重分析结果显示CNF和CNC在固化过程中被保留在涂层中,并形成氢键结合。拉伸测试结果表明,CNF-PSA、CNC-PSA和SDS-PSA膜的抗拉强度分别为8.14、6.91和1.09 MPa,其中,CNF-PSA膜的弹性模量达到130.3 MPa,为SDS-PSA膜的652倍。     

基于聚多巴胺修饰的聚吡咯导电织物制备与应变传感性能

为改善聚吡咯(PPy)导电层与织物基底的结合牢度,提高应变传感器的稳定性,以聚多巴胺为粘合剂,采用原位聚合法制备聚吡咯/聚多巴胺(PPy/PDA)导电涤纶/氨纶织物,探究PPy/PDA导电涤纶/氨纶织物的导电性能和应变传感性能。用扫描电子显微镜、傅里叶变换红外光谱分析其表面形貌与结构,采用实验室自制的KTC传感器测试盒,测试其灵敏度和稳定性。结果表明,与PPy导电涤纶/氨纶织物相比,PPy/PDA导电涤纶/氨纶织物表面导电层更均匀,导电填料与基底的结合牢度更高,制得的传感元件灵敏度高,在500次重复应变后的稳定性更好,可应用于人体运动检测和康复训练等领域。     

导电纸的开发与应用

本文概述了导电纸的制造方法和应用领域。导电纸的主要制造方法有：导电材料与纸浆纤维混抄（湿法）、导电纤维用胶黏剂黏合或与热熔性纤维熔合（干法）、纸基用导电涂料涂布、化学镀和导电聚合物／纸浆纤维现场吸附聚合等。导电纸可广泛应用于防静电包装、电磁屏蔽、面状发热体、新能源和电化学材料、传感和致动材料等领域。     

聚苯胺/纸浆纤维复合制造导电纸(Ⅰ)--吸聚条件对导电纸性能的影响

采用原位吸附聚合法使苯胺聚合于纸浆纤维的微孔壁中制备了导电纸。系统地研究了氧化剂K2S2O8和（NH4）2S2O8用量、反应温度、反应时间等对导电纸表面电阻率的影响。优化了制备导电纸的最佳吸聚条件：聚合时间105min，反应温度5℃，氧化剂的用量取决于氧化剂的种类。当K2S2O8为氧化剂时，氧化剂与苯胺质量比为1：2最佳，导电纸的表面电阻率为481Ω/cm^2；当（NH4）2S2O8为氧化剂时，氧化剂与苯胺质量比为3：4最佳，导电纸的表面电阻率可达108Ω/cm^2。作为氧化剂，（NH4）2S2O8优于K2S2O8。     

纤维素纳米纤维对聚乙烯醇复合膜性能的影响

采用TEMPO氧化法制得直径4~10 nm，长径比达100以上的蔗渣纤维素纳米纤维（CNF），并利用CNF与聚乙烯醇（PVA）制备CNF/PVA复合膜，研究了添加甘油或聚乙二醇（PEG-400）对CNF/PVA复合膜透光率及力学刚性性能的影响。结果表明，CNF/PVA复合膜能兼具纯CNF膜的高机械强度和纯PVA膜的高延展性，CNF含量为25%的CNF/PVA复合膜在400~700 nm波长范围内的透光率达90%以上，杨氏模量为4.72 GPa的同时断裂伸长率可达6.92%；添加甘油或PEG-400会降低膜的机械刚性而提高膜的拉伸性能，两者均会降低膜的透光度。     

3D打印碳纳米管/纳米纤维素复合电极制备及性能

本研究探索了基于光固化的3D打印技术制造导电聚合物树脂材料。以可光固化树脂和多壁碳纳米管（MWCNT）混合物为基底,通过添加纳米纤维素（CNF）来改善MWCNT的分散性,使混合树脂达到最佳的导电性能和印刷质量。此外,结合了光固化、热解和化学活化等反应过程,形成可设计的分级孔结构的碳电极,该电极具有从毫米级到微米级再到纳米级分布的孔隙结构,组装对称超级电容器可提供高能量密度0.91 mWh/cm²。     

pH响应性纤维素纳米纤丝/海藻酸钠基水凝胶的制备及其释药性研究

将纤维素纳米纤丝（CNF）和海藻酸钠（SA）共混,然后在CaCl2的交联作用下,制得具有pH响应性的CNF/SA水凝胶,并通过物理包裹的方式将阿司匹林（ASP）、CNF和SA三者混合均匀后,在CaCl2的交联作用下制得ASP/CNF/SA载药水凝胶,研究ASP在不同pH值环境中的缓释行为。结果表明,ASP/CNF/SA载药水凝胶的载药量为194 mg/g,包封率达49.9%,且药物分子和水凝胶都保持了很好的热稳定性。ASP/CNF/SA载药水凝胶的药物释放具有pH响应性,药物分子的释放速率随着环境pH值的升高而加快。在p H值为1.5～11.0的缓释条件下,药物的释放行为均为溶蚀作用。     

Review of techniques to manufacture micro-hydrogel particles for the food industry and their applications

Microgels are ‘soft’ microscopic cross-linked polymeric particles that are being increasingly exploited in a variety of industries for rheology control, encapsulation and targeted delivery. They are valued because of the ability to tune their functionality to address specific applications in oil recovery, coatings, drug delivery, cosmetics, personal care and foods. Food microgels are typically biopolymer hydrogels in the form of microspheres, nanospheres (also called nanogels), spheroids and fibres. The utilisation of engineered microgels in foods has so far been limited, despite their great potential to address several needs in the food industry, including: satiety control, encapsulation of phytonutrients and prebiotics, texture control for healthier food formulations (e.g. reduced fat products), and targeting delivery to specific areas in the digestive tract. We review the scientific and patent literature on the utilisation and manufacturing methods for producing microgels with an emphasis on micro-hydrogels for food applications.     

12—A CRITIQUE OF SOME HYPOTHESES RELATING TO THE HETEROGENEITY OF THE HIGH-SULPHUR PROTEINS OF WOOL

Joubert and Burns prepared a large number of fractions from the high-sulphur proteins of wool and estimated their molecular weights and amino-acid compositions. Their data have been re-examined in order to look for statistically significant interrelations between amino acids and between the proportion of various amino acids and molecular weight. Statistical analysis of the data is also used to examine the credibility of some hypotheses concerning the mechanism of keratin biosynthesis and to provide further evidence for the existence of families of proteins within the high-sulphur fractions of wool.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of     

The Latest Data about Development of Chinese Printing Industry in 2013

In the 2014 China（Shanghai）International Printing Week,Director Wang Yanbin released the latest data about development of Chinese printing industry in 2013.According to statistics,in 2013,the total output value of Chinese printing industry exceeded 1trillion Yuan for the first time,reaching 1.03985 trillion Yuan.There were 105,000 printing enterprises in China,employees were 3.415 million.The total asset was 1.06247 trillion Yuan;     

The State Council Issued "Directory of Government Approved Investment Projects(2013 Edition)"

正On December 2nd,2013,the State Council issued the notification of"Directory of Government Approved Investment Projects(2013 Edition)"(hereafter referred to as"notification").It is pointed out in the"notification"that in order to further deepen reforms in investment systems and administrative examination and approval systems,simplify administrative procedures and delegate powers to lower levels,earnestly     

China textile machinery: taking off in progress

正Among the 1600 exhibitors who take apart in the ITMA ASIA+CITME2014 2/3 are Chinese manufactures.If the numerous figures failed to attract your attention,the increase of quality should draw your focus.To adopt the demand of developing textile machine market,domestic textile machinery enterprises now follow the slogan of"technology drives development"to enhance product competitiveness.Our domestic sellers will showcase product ranging from spinning,weaving,dyeing and printing,     

Top Ten News of China's Paper Industry 2013

On December 24th, 2013, the meeting on the selection of top 10 news of China＇s paper industry 2013 sponsored by 〈China Paper Newsletters〉 was held in Beijing. The yearly selection of the top l0 news, which began in 2000, has become a brand activity widely recognized in the industry thanks to the support from the authorities at all levels and public participation.     

National Development and Reform Commission Issued Announcement for Selection of Major Preliminary Research Projects for the "13~(th) Five-Year Plan"

In Apri Commi major p Plan＂ （h 2014, the National Development and Reform ssion issued an announcement for selection of reliminary research projects for the ＂13th Five-Year ereafter referred to as ＂The Announcement＂）     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the latest scientific     

Contamination of animal feed and food from animal origin with mineral oil hydrocarbons

Oils and fats used for the production of animal feed can become contaminated with mineral oil material originating from gas oils (C₁₈-C₃₅) or synthetic oils (poly alpha olefins, C₂₅ to beyond C₄₅). An important cause is assumed to be the discharge of waste oils, such as motor oil and hydraulic oils. Mineral oil material was analysed by on-line LC-GC-FID directly in the fat or in a raw extract from animal feed or foodstuffs. In Switzerland in summer/autumn 1999 concentrations in oils and fats for feed production were often found to be between 100 and 1000mg/kg. In the feeds, the average concentration was around 100mg/kg with values ranging up to a maximum of 1000mg/kg; few samples were free of contamination. In animal body fat, the average concentration determined in summer 1999 was 25mg/kg, with a maximum of 150mg/kg, although in samples from December 1999, contamination was substantially lower. In the fat phase of eggs, the average concentration was 30mg/kg, with a maximum of 80mg/kg. Paraffin oil is used for feed production, which may account for part of the contamination problem (e.g. eggs).