二氧化钛

Abstract(#br)Aging in water of a TiO 2 -based nanocomposite used in sunscreen cosmetics has been studied as a function of light and time. It consisted initially in a TiO 2 core, coated with Al(OH) 3 and polydimethylsiloxane (PDMS) layers. Size measurement, coating alteration, and surface charge were followed by laser diffraction, TEM/EDS, ICP-AES and electrophoretic mobility measurement.(#br)The nanocomposite rapidly underwent progressive dispersion in the aqueous phase, enabled by the dissolution of the PDMS layer.

Abstract(#br)The phosphorylation of proteins is a major post-translational modification that is required for the regulation of many cellular processes and activities. Mass spectrometry signals of low-abundance phosphorylated peptides are commonly suppressed by the presence of abundant non-phosphorylated peptides. Therefore, one of the major challenges in the detection of low-abundance phosphopeptides is their enrichment from complex peptide mixtures. Titanium dioxide (TiO 2 ) has been proven to be a highly efficient approach for phosphopeptide enrichment and is widely applied.

Abstract(#br)Atomic layer deposition (ALD) surges as an attractive technology to deposit thin films on different substrates for many advanced biomedical applications. Herein titanium dioxide (TiO 2 ) thin films were successful obtained on polyurethane (PU) and polydimethylsiloxane (PDMS) substrates using ALD. The effect of TiO 2 films on Candida albicans growth and inactivation process were also systematic discussed. TiCl 4 and H 2 O were used as precursors at 80\u003cce:hsp sp=\"0.25\"/\u003e°C, while the reaction cycle number ranged from 500 to 2000.

摘要\n聚合物在生物材料方面的应用越来越引起人们的兴趣。研究人员一直在尝试将金属氧化物或金属纳入聚合物中，以获得显著提高所得到聚合物材料的理想性能，如导电性和抗菌活性。这类材料的一个很有前途的技术是原子层沉积( ALD )。通过沉积一层非常薄的金属或金属氧化物薄膜，人们可以在不损失聚合物独特的本体性能的前提下利用这些材料的特性，然而，由于表面和亚表面薄膜的生长，这种材料在聚合物上的沉积在一定程度上变得困难。\n本研究在O2等离子体处理和非等离子体处理的PDMS上，研究了TiO2在聚二甲基硅氧烷( PDMS )上成核和生长初期的原子层沉积( ALD )，采用X射线近边结构吸收、扫描电子显微镜/能量色散X射线能谱和X射线光电子能谱对材料进行表征。结果表明，等离子体处理的PDMS表面发生了类ALD的TiO2表面生长，对于非等离子体处理的原始PDMS，TiO2在聚合物亚表面得到了明显的有利扩散/浸润，至少前25个ALD循环没有明显的外表面沉积。

Transparent, hydrophobic hybrid films were deposited on glass substrate from solution containing hydroxyl-terminatedpolydimethylsiloxane (PDMS) and TiO2 sol by using a dip coating method. The effects of the film heat-treatment temperatureand PDMS/TiO2 component on surface properties of the hybrid films were investigated by water drop contact angle measurement,and by atomic force microscopy (AFM) and scanning electron microscope (SEM) analyses.

Transparent, hydrophobic hybrid films were deposited on glass substrate from solution containing hydroxyl-terminatedpolydimethylsiloxane (PDMS) and TiO2 sol by using a dip coating method. The effects of the film heat-treatment temperatureand PDMS/TiO2 component on surface properties of the hybrid films were investigated by water drop contact angle measurement,and by atomic force microscopy (AFM) and scanning electron microscope (SEM) analyses.

Abstract\n\t\t\t\t\n\t\t\t\t\tA novel, miniaturized, high-efficiency photocatalytic cell, able to work in dynamic conditions, has been designed and validated in this study. Microfluidic channels were molded out of polydimethylsiloxane (PDMS) by means of standard soft lithography techniques, so as to work as photocatalytic cells, where the coupling of anatase titanium dioxide thin films and platinum electrodes, allows an electrically assisted photocatalytic reaction to produce dissolved oxygen gas from the water content of flowing fluid (e.g. blood).

本研究将光催化二氧化钛( TiO2 )纳米粒子引入到聚甲基丙烯酸甲酯( PMMA )中，得到PMMA / TiO2纳米复合材料，随后通过聚二甲基硅氧烷( PDMS )转移复制形成鲨鱼皮结构。结果表明，与平板状PMMA / TiO2纳米复合材料相反，鲨鱼皮状PMMA / TiO2纳米复合材料由于其光催化、抗菌和结构性能的协同作用，阻止了长达2 周的生物膜的形成。本研究为抑制生物膜形成提供了一种切实可行的方法。

本研究将光催化二氧化钛( TiO2 )纳米粒子引入到聚甲基丙烯酸甲酯( PMMA )中，得到PMMA / TiO2纳米复合材料，随后通过聚二甲基硅氧烷( PDMS )转移复制形成鲨鱼皮结构。结果表明，与平板状PMMA / TiO2纳米复合材料相反，鲨鱼皮状PMMA / TiO2纳米复合材料由于其光催化、抗菌和结构性能的协同作用，阻止了长达2 周的生物膜的形成。本研究为抑制生物膜形成提供了一种切实可行的方法。

由于污染、微生物定植、水体等诱发的几种腐烂现象，保护我们的文物成为必要。本研究一直致力于阐述光激活纳米复合材料对户外遗产建筑的保护。因此，具有增强光响应活性的新型Ag-TiO2 / PDMS疏水纳米复合材料(掺杂率低)薄膜被开发用于自清洁耐久的古迹保护涂层。本工作阐述的防护涂料意在具有多功能性能(拒水特性、自清洁活性、抗菌剂)。为了达到我们的目的，首先采用溶胶-凝胶法合成了不同掺杂量( 0.1、1、3、5 mol % )的银掺杂二氧化钛纳米颗粒( Ag-TiO2 NPs )。对制备的纳米颗粒进行了表征，并对其性能进行了对比评价，通过测试光降解和光杀伤活性，找出了合适的掺杂剂低掺杂率。本研究的第二部分重点阐述了Ag-TiO2 / PDMS疏水纳米复合材料(选定的低掺杂率)作为自清洁防护涂层。为此，将Ag掺杂TiO2纳米颗粒分散在聚合物粘结剂(聚二甲基硅氧烷，PDMS )中，应用于非常多孔的石材基材，即Lecce石材( LS )中，通过色度学测试、接触角测试、水毛细管吸收测试、水蒸气透过率测试、铅笔和维氏硬度测试、光学显微镜分析、扫描电镜分析、能谱仪( SEM- EDS )、微生物实验、自清洁实验等不同的实验分析，评价所得纳米复合材料(最佳Ag掺杂TiO2纳米颗粒/粘结剂比、最佳掺杂量)对石材基材的适宜性。此外，还评估了纳米复合涂层在不同老化周期下的耐久性。