纯棉织物的石墨烯防紫外导电导热功能整理

采用石墨烯纳米片(GNs)作为功能整理剂,水溶性聚氨酯(WPU)为黏合剂,通过传统的轧-烘-焙工艺对棉织物进行改性整理,研究了改性棉织物的防紫外、导电和导热性能。采用扫描电子显微镜(SEM)和傅里叶红外光谱(FTIR)分析改性棉织物的表观形态和内部结构;采用紫外线防护系数(UPF)评估防紫外线性能,采用两探针法测定织物表面导电性能并得到相应的IV曲线。结果表明,经石墨烯改性后的棉织物具有超强的紫外线防护性,其导电性和导热性能也分别有相应的提高。当石墨烯涂覆量为240 mg/m2时,其UPF值达到253.9,远高于未处理棉织物(UPF=8.19);改性棉织物的表面电阻率由未处理时的107Ω·m降到10-1Ω·m。     

TiO2-ZnO复合水溶胶对纯棉织物的抗紫外线整理

采用溶胶-凝胶技术制备TiO2-ZnO水溶胶,通过浸轧、烘干、焙烘等工序对纯棉织物进行整理,然后对整理前后织物的抗紫外线性能进行比较,评价其抗紫外线等级,对整理后未皂洗织物和皂洗30次织物的抗紫外线性能进行比较,以评价抗紫外线性能的耐久性.结果表明,经整理的织物UPF等级为50＋,皂洗30次后的UPF等级为35,即经过此法整理的纯棉织物具有很好的紫外线防护性能和良好的耐久性.     

氧化石墨烯改性棉织物防紫外线性能研究

探讨壳聚糖/氧化石墨烯层层自组装整理后棉织物的防紫外线性能。采用自制氧化石墨烯和壳聚糖以分子间静电作用为驱动力,通过层层自组装法对棉织物进行表面改性,分析了改性棉织物的表观形态结构及防紫外线性能。研究表明:通过静电自组装过程,氧化石墨烯与壳聚糖在棉织物表面形成组装膜;改性棉织物展现出了优异的紫外线屏蔽性能,仅组装1次,改性织物表面的UPF值即从9.37增至88.93,组装10次后UPF值高达452,同时改性棉织物防紫外线性能的水洗耐久性良好。认为:采用自制氧化石墨烯和壳聚糖,通过层层自组装法可以制备出防紫外线性能优异的改性棉织物。     

纳米TiO2的抗紫外线整理应用研究

 采用溶胶-凝胶法制备纳米二氧化钛及其整理剂,通过浸—轧工艺将其用于棉织物的抗紫外线整理。用扫描电镜对制得的纳米二氧化钛粒子及整理前、后织物的表面进行了观察,同时测定了整理织物的抗紫外线性能。结果表明,整理后的织物具有优异而耐久的抗紫外线效果,其UPF≥50;UPF值随整理液中二氧化钛的增加而升高;经50次洗涤后,UPF值仍保持在较高的水平,且织物的白度、手感等性能较好。     

纯棉织物氧化石墨烯防紫外线整理

氧化石墨烯具有优异的电学、光学性能且在水中具有很好的分散性,可用于织物防紫外线功能整理。文中研究了氧化石墨烯用于纯棉织物防紫外线功能整理,探讨了不同整理方法对织物性能的影响,并通过单因素试验、正交试验研究了浸渍工艺中氧化石墨烯用量、浸渍温度、浸渍时间、水洗次数对整理后纯棉织物防紫外线性能的影响。结果表明,氧化石墨烯用于纯棉织物防紫外线整理,可实现纯棉织物优异的防紫外线性能,且浸渍工艺整理的织物防紫外线性能、均匀性、手感等各方面均较优异;确定最佳工艺条件为:氧化石墨烯用量2.0 g/L,浸渍温度为100℃,浸渍时间为30 min,水洗10次。     

锐钛矿型纳米TiO_2在棉织物上的原位生长及其抗紫外线性能

室温条件下白色棉府绸织物二浸二轧自制的TiO2-SiO2复合溶胶,于98~100℃水热处理20 min后晾干。织物的紫外线透过率和UPF测定结果显示,复合溶胶整理后棉织物的紫外线防护性能大大提高。采用SEM、AFM和XRD对整理后棉织物进行表征发现织物上有锐钛矿型纳米TiO2生成,其粒径为30 nm左右。标准水洗实验证明,棉织物上原位生长的锐钛矿型纳米TiO2与织物结合牢固,10次水洗后织物的抗紫外线性能没有下降,反而有所提高。     

硼氮掺杂碳点对棉织物防紫外线性能的影响

为提高棉织物的防紫外线能力,以柠檬酸、乙二胺和硼砂为原料,采用一步水热法合成了硼氮掺杂碳点(BN-CDs), 将BN-CDs水溶液、BN-CDs/聚乙烯醇共混水溶液和BN-CDs/水性聚氨酯共混水溶液分别喷涂于棉织物表面,再对棉织物进行碾压干燥处理,测试了织物的紫外线防护系数及其耐水洗性能等。结果表明:所制备的BN-CDs表面上含有丰富羟基和胺基的石墨状纳米晶体,兼具良好水溶性;在紫外区具有强吸收峰,在紫外光激发下可以发出蓝色荧光,且荧光发射波长不依赖于激发波长;整理后的棉织物均表现出极高的紫外线防护系数(UPF); 经BN-CDs/水性聚氨酯整理后的棉织物效果最佳,水洗10次后UPF值仍保持在48左右,达到较高的保护级别,且棉织物表面形态基本不变,手感良好,可满足棉织物紫外线防护要求。     

GO/WPU复合涂层剂对纯棉针织面料的功能整理

为增强氧化石墨烯(GO)的亲水性和分散性,利用聚乙烯亚胺(PEI)进行接枝改性,并与水溶性聚氨酯(WPU)超声共混,获得GO/WPU纳米复合涂层剂。通过轧-烘-焙工艺方法对棉织物进行整理,利用水合肼还原制得还原氧化石墨烯(RGO)/WPU复合棉织物。采用物理化学性质及光谱特性分析评价GO/WPU涂层剂性能,借助SEM和XPS对RGO/WPU复合棉织物进行结构表征,并研究其导电性能及紫外线防护性能。结果表明:改性GO在WPU中均匀分散(乳液粒径小于116.83 nm),两者分子间存在氢键作用,热稳定性以及拉伸强度均显著提升;涂层剂可以在棉纤维表面形成较均匀的涂层,织物的表面电阻从4.21×10~8Ω·m最低降至1.29×10~2Ω·m,紫外防护系数(UPF)最高增强137倍。     

原位生长法对棉织物的防紫外线整理研究

研究原位生长法对棉织物防紫外线整理效果。以钛酸丁酯和无水乙醇为原料,采用水热法在棉织物表面实现TiO_2纳米管的原位生长。采用X射线衍射仪、红外光谱仪、防紫外线性能测试仪等对整理的棉织物结构和性能进行分析。结果表明:原位生长法制得的TiO_2纳米管与棉织物无化学反应,整理后的棉织物防紫外线性能明显提高,洗涤10次后织物的UPF值仍达50+,断裂强力下降12.3%,白度略有下降。认为:三种整理方法中,原位生长法最好。     

改性棉织物氧化石墨烯防紫外线整理

文中用氯乙酸钠对棉织物进行羧甲基化改性,再用氧化石墨烯通过静电作用在改性棉织物上层层组装得到氧化石墨烯棉织物,利用保险粉对其还原,并通过单因素试验研究了在不同还原条件下对织物防紫外效果的影响。结果表明:将氧化石墨烯棉织物用8 g/L保险粉于25℃还原120 min时,所得棉织物紫外线防护效果较好,紫外防护系数UPF值能达到187左右;氧化石墨烯棉织物在水洗20次后UPF值虽然有所降低,但仍具有优异的紫外防护性能。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

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     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.