公开(公告)号：US08158005B1

公开(公告)日：2012-04-17

申请号：US12263799

申请日：2008-11-03

申请人： Vinay Gupta ,  Maya Trotz ,  Cecil Coutinho

发明人： Vinay Gupta ,  Maya Trotz ,  Cecil Coutinho

IPC分类号： C02F1/28 ,  C02F1/32

CPC分类号： C02F1/725 ,  C02F1/32 ,  C02F2101/308 ,  C02F2305/10

摘要： Microcomposites comprising titanium dioxide (TiO2) nanoparticles embedded within cross-linked, thermally responsive microgels of poly(N-isopropylacrylamide) are disclosed. Interpenetrating linear chains of poly(acrylic acid) functionalize the nanoparticles for dispersal within the microgel framework. The microcomposites show rapid sedimentation, which is useful for gravity separation applications such as environmental remediation via photocatalytic degradation.The extent of loading of the TiO2 within the colloidal particles can be easily manipulated from 10% (weight) to a value as high as 75%. The microgel-titania composites showed rapid sedimentation, which is useful for gravity separation of these particles in photocatalytic applications. The settling of the microgel-titania composites occurred over minutes and was much faster than solid, impermeable spheres. As the content of TiO2 increased within the particles from 10% to 75%, the increased effective particle density led to significant decrease in the settling time from approximately 2200 seconds to approximately 100 seconds.

摘要翻译： 公开了包含聚（N-异丙基丙烯酰胺）交联的热响应微凝胶内的二氧化钛（TiO 2）纳米颗粒的微复合材料。 聚（丙烯酸）的互穿线性链将纳米颗粒官能化以在微凝胶框架内扩散。 微复合材料显示出快速沉降，其可用于重力分离应用，例如通过光催化降解的环境修复。 胶体颗粒内TiO 2的负载程度可以容易地从10％（重量）到高达75％的值。 微凝胶 - 二氧化钛复合材料显示出快速沉降，其可用于光催化应用中这些颗粒的重力分离。 微凝胶 - 二氧化钛复合材料的沉降发生在几分钟之内，比固体，不渗透球体快得多。 随着TiO 2的含量从10％增加到75％，增加的有效颗粒密度导致沉淀时间从大约2200秒显着降低到约100秒。

公开(公告)号：US09120952B2

公开(公告)日：2015-09-01

申请号：US11926826

申请日：2007-10-29

申请人： Vinay Gupta ,  Ashok Kumar ,  Cecil Coutinho ,  Subrahmanya Mudhivarthi

发明人： Vinay Gupta ,  Ashok Kumar ,  Cecil Coutinho ,  Subrahmanya Mudhivarthi

IPC分类号： C09G1/02 ,  H01L21/3105

CPC分类号： C09G1/02 ,  C08G83/001 ,  C08J3/075 ,  C08J3/128 ,  C08J5/005 ,  C08J2300/208 ,  C08J2323/26 ,  C08J2343/04 ,  C09K3/1436 ,  C09K3/1463 ,  H01L21/31053

摘要： Organic-inorganic composites were prepared as colloidal particles of a cross-linked, thermally responsive polymer. Hybrid PNIPAM-polysiloxane particles and composite polymeric particles with embedded nanoparticles of an inorganic metal-oxide (MOx) such as CeO2 and TiO2 were formed. To promote the incorporation of unaggregated nanoparticles, temperature responsive microspherical gels (microgels) of N-isopropylacrylamide (NIPAM) with interpenetrating (IP) linear chains of poly(acrylic acid) (PAA) were used. The organic-inorganic composition of the hybrid polymer network was controlled by changing the time for condensation and hydrolysis of the siloxane monomer during synthesis. Experimental results indicated that the planarization of silicon oxide wafers using these hybrid particles and composites exhibited lower topographical variations and surface roughness as compared to slurries consisting of only silica or ceria nanoparticles while achieving similar removal rates and better or similar frictional characteristics.

摘要翻译： 制备有机 - 无机复合材料作为交联的热响应聚合物的胶体颗粒。 形成混合PNIPAM-聚硅氧烷颗粒和具有无机金属氧化物（MOx）如CeO 2和TiO 2的嵌入纳米颗粒的复合聚合物颗粒。 为了促进未聚集的纳米颗粒的掺入，使用具有聚（丙烯酸）（PAA）的互穿（IP）线性链的N-异丙基丙烯酰胺（NIPAM）的温度敏感性微球凝胶（微凝胶）。 通过在合成过程中改变硅氧烷单体的缩合和水解时间来控制杂化聚合物网络的有机 - 无机组合物。 实验结果表明，与仅由二氧化硅或二氧化铈纳米颗粒组成的浆料相比，使用这些杂化颗粒和复合材料的氧化硅晶片的平面化显示更低的形貌变化和表面粗糙度，同时实现类似的去除速率和更好或相似的摩擦特性。

公开(公告)号：US20090013609A1

公开(公告)日：2009-01-15

申请号：US11926826

申请日：2007-10-29

申请人： Vinay Gupta ,  Ashok Kumar ,  Cecil Coutinho ,  Subrahmanya Mudhivarthi

发明人： Vinay Gupta ,  Ashok Kumar ,  Cecil Coutinho ,  Subrahmanya Mudhivarthi

IPC分类号： C09G1/02 ,  C09K13/00

CPC分类号： C09G1/02 ,  C08G83/001 ,  C08J3/075 ,  C08J3/128 ,  C08J5/005 ,  C08J2300/208 ,  C08J2323/26 ,  C08J2343/04 ,  C09K3/1436 ,  C09K3/1463 ,  H01L21/31053

摘要： Organic-inorganic composites were prepared as colloidal particles of a cross-linked, thermally responsive polymer. Hybrid PNIPAM-polysiloxane particles and composite polymeric particles with embedded nanoparticles of an inorganic metal-oxide (MOx) such as CeO2 and TiO2 were formed. To promote the incorporation of unaggregated nanoparticles, temperature responsive microspherical gels (microgels) of N-isopropylacrylamide (NIPAM) with interpenetrating (IP) linear chains of poly(acrylic acid) (PAA) were used. The organic-inorganic composition of the hybrid polymer network was controlled by changing the time for condensation and hydrolysis of the siloxane monomer during synthesis. Experimental results indicated that the planarization of silicon oxide wafers using these hybrid particles and composites exhibited lower topographical variations and surface roughness as compared to slurries consisting of only silica or ceria nanoparticles while achieving similar removal rates and better or similar frictional characteristics.

摘要翻译： 制备有机 - 无机复合材料作为交联的热响应聚合物的胶体颗粒。 形成混合PNIPAM-聚硅氧烷颗粒和具有无机金属氧化物（MOx）如CeO 2和TiO 2的嵌入纳米颗粒的复合聚合物颗粒。 为了促进未聚集的纳米颗粒的掺入，使用具有聚（丙烯酸）（PAA）的互穿（IP）线性链的N-异丙基丙烯酰胺（NIPAM）的温度敏感性微球凝胶（微凝胶）。 通过在合成过程中改变硅氧烷单体的缩合和水解时间来控制杂化聚合物网络的有机 - 无机组合物。 实验结果表明，与仅由二氧化硅或二氧化铈纳米颗粒组成的浆料相比，使用这些杂化颗粒和复合材料的氧化硅晶片的平面化显示更低的形貌变化和表面粗糙度，同时实现类似的去除速率和更好或相似的摩擦特性。