简介:以聚合物或改性油脂作为纳米粒子前驱体的分散载体,可以将纳米粒子前驱体引入革纤维间隙间;纳米前驱体在一定pH条件下水解原位产生无机纳米粒子,通过无机纳米粒子和蛋白质间的有机-无机杂化作用,实现对生皮的鞣制。研究了无机纳米粒子和蛋白质的作用机理,有机无机纳米杂化对成革热稳定性的影响以及无机纳米粒子在革纤维中的尺寸大小及其分布,并选择黄曲霉、黑曲霉和拟青霉作为代表菌种,采用圆片培养皿法,研究纳米粒子的引入对成革防霉性的影响。结果表明,无机纳米粒子在蛋白质纤维中分布均匀,粒径小于150nm;与铬鞣革相比,纳米鞣革对黑曲霉和拟青霉生长具有明显的抑制作用,铬鞣革培养3天开始有霉菌生长,而纳米SiO2鞣革培养4天也没有霉菌生长,显示了良好的防霉性能。
简介:摘要:通过总结近二十年的文献,了解SiO2增透膜的作用机理以及在现实生活中的应用方向,本文通过对SiO2增透膜的发展热点、合成方法和制备工艺以及在相关领域的发展做了进一步总结,发现SiO2增透膜在薄膜层技术已经非常成熟,其影响薄膜稳定性的因素已做了相应探讨。因此未来在其他领域与新材料的结合奠定了坚实的基础。
简介:Theeffectofλ/2SiO2overcoatonthelaserdamagecharacteristicsofHfO2/SiO2high-reflector(HR)coatingsisinvestigatedwith1-on-1andN-on-1laserdamagetestmethods.Thelaserdamagesurfaceof1-on-1isanalyzedbyastepanalyzer.ThesurfacemorphologiesshowthatlaserdamagemakesthecoatingdamagedareaprotrudentandroughforHRcoatingwithoutλ/2silicaovercoat,butconcaveandsmoothforHRcoatingwithλ/2silicaovercoat.Theresultof10-on-1multi-pulseirradiationonthesamepointofthecoatingshowsthatthereisanenergydensitystageonthedamagecurve.Ifthelaserenergydensityiswithintherangeofthestage,HfO2/SiO2HRcoatingswithλ/2silicaovercoatwillnotbedamagedmorethan2timesformulti-shots,andthesurfacedamagesareveryslightsothatthereisnoimpactonthecoatingperformance.Anotherinterestingresultisthattheenergydensitystageextendsfromthedamagethresholdtothepointofabout3timesofthreshold,whichissimilartotheeffectofthelaserconditiononcoating.
简介:TheapproachofutilizingcombustionsynthesistomakefineparticlesofSiO2,Al2O3andTiO2isaquitemoderntechnology.Throughthechemicalreactioninpost-flameregion,fineSiO2particlescanbeformedwithhighpurityonplatesurface.Therefore,thecombustionsynthesisofSiO2powdersisanimportantareaforfurtherresearchanddevelopment,especiallyfortheapplicationofSiO2inthesemiconductorindustry.Thisinvestigationproposesanexperimentalapproach(i.e.,agas-phasecombustionsynthesis)usingtwodifferentkindsoforganiccompounds,Hexamethyldisilazane(HMDSA)andHexamethyldisioxane(HMDSO),asthesiliconprecursors.ApremixedgasburnerischosenwithC3H8asfuel,airasoxidantandpartoftheairwasusedasthecarryinggastoentrainHMDSA/HMDSOvaporintothecombustiblemixture.ObservationsshowthattheC3H8/airflamechangedcolorfromapale-blueflametolightyellowandthenorangewhendifferentamountsofprecursorswereintroduced.Throughthechemicalreactioninthepost-flameregion,fineSiO2particleswereformedinthegasphaseandthenquenchedandcollectedonanaluminumflatplate.TheobjectiveofthispaperistostudytheeffectsofHMDSOandHMDSAconcentrationsandflametemperaturesonthesynthesisofSiO2particles.