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Tsukruk, Vladimir V.

doi:10.1023/a:1009090732296

Cited by 35 publications

(6 citation statements)

References 21 publications

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“…The four films have no obvious change in surface roughness. But the PEMs matrix filled with copper hydroxide nanoparticles would decrease the mobility of the polymer chain segments which can undergo significant and reversible shear deformation [19,20], and the higher shear strength during relative motion must be overcome which results in the higher friction coefficient as compared to pristine films [21]. At the higher sliding velocity of 140 mm/min, we thought, a large number of nanoparticles were brushed off which made the friction coefficient sharply rise.…”

Section: Morphological Characterizationmentioning

confidence: 94%

Study on the tribological behaviors of polyelectrolyte multilayers containing copper hydroxide nanoparticles

Yang

Zhang

2006

Tribol Lett

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In this paper, we reported the tribological behaviors of polyelectrolyte multilayers (PEMs) containing copper hydroxide nanoparticles, polymer films were prepared by the sequential adsorption Poly(diallyldimethylammonium chloride) (PDDA) and poly(sodium 4-styrenesulfonate) (PSS) alternately on substrate. The nucleation of copper hydroxide nanoparticles was achieved using a cyclical absorption-hydrolysis process in which copper ions were absorbed into the polymer matrix (which bind to the sulfonate groups) and then hydrolysis in an alkali solution. The structure and the morphology of before and after the in-situ synthesis copper hydroxide nanoparticles in the PEMs matrix have been explored. The coefficient of friction as a function of sliding velocity and normal load also has been studied. The composites exhibited increased wear resistance compared with the pristine polymer films. This may partly be attributed to the enhanced load-carrying capacity of the inorganic nanoparticles in the PEMs.

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Section: Morphological Characterizationmentioning

confidence: 94%

Study on the tribological behaviors of polyelectrolyte multilayers containing copper hydroxide nanoparticles

Yang

Zhang

2006

Tribol Lett

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“…In the past, several investigations that were focused on improving the tribological behaviour of silicon, have led to the development of various surface modification techniques such as chemical modification (use of molecular coatings such as Langmuir or self-assembled monolayers (SAMs)) [3][4][5], and topographical modification [1,[6][7][8][9]. Recent advances in polymer research have brought forth interesting tribological materials such as polymer brushes and nano-composite monolayers [10][11][12], which have promising applicative potential in micro/nanoscale devices. Examples of topographical modification include laser texturing [1], micro-dimple formation [6] and ion-beam roughening of surfaces [8,9].…”

Section: Introductionmentioning

confidence: 99%

Tribological properties of bio-mimetic nano-patterned polymeric surfaces on silicon wafer

et al. 2006

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Nano-patterns made of poly(methyl methacrylate) (PMMA) were fabricated on silicon wafer using a capillarity-directed soft lithographic technique. Patterns with three different aspect ratios were investigated for their adhesion and friction properties at nano-scale and for friction at micro-scale. The patterned samples exhibited superior tribological properties, at both these scales when compared to those of flat PMMA thin films.

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“…A more interesting aspect is the control of nanoscalelevel segregation by external means. Such a phenomenon has been observed, for example, in electrospun fibers containing carbon nanotubes, [5] in molecule-thick elastomers with interesting microtribological properties, [6] and in the appearance of chirality in achiral systems. [7] From a device-application point of view, the combination of self-assembly and phase segregation has been well exploited in optical shutters formed by polymer-dispersed LCs, [8] very high-charge-mobility devices with columnar LCs, [9] etc.…”

mentioning

confidence: 99%

“…[4,5] In particular, ZnO has attracted attention as a fascinating alternative to TiO 2 in dyesensitized solar cells (DSCs) based on recent reports that demonstrated that ZnO and TiO 2 exhibit a similar electroninjection process from excited dyes in DSCs. [6,7] In these reports, ZnO showed a higher electronic mobility, making it more desirable. In order to improve physical and chemical performance in devices, designing the morphology of ZnO into rods, [8] columns, [9] and hierarchical structures [10] is now focus of current research.…”

mentioning

confidence: 99%

Dynamic Self‐Assembly of the Liquid‐Crystalline Smectic A Phase

2005

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CdSe/ZnS quantum dots were chosen for their higher quantum yield and easier fluorescence microscopic visualization relative to uncoated CdSe quantum dots.) [29] Separate polymerization studies using catalyst 3 are in progress:K. Breitenkamp, T. Emrick, unpublished. Dynamic Self-Assembly of the Liquid-Crystalline Smectic A Phase** By S. Krishna Prasad,* Geetha G. Nair, and Gurumurthy HegdePhotonics, in which light can be controlled by light as a stimulus, is being proposed as the future technology for highspeed information processing. Liquid-crystalline systems are known for the large change in their optical effects as a response to even weak external fields, and are being considered for other optical applications apart from their phenomenal success in flat-panel devices. A niche area of research that is being actively pursued in this regard is the photoinduced phase transitions in liquid-crystalline systems and the concomitant changes in birefringence which are useful for optical devices. In all the cases reported to date, the photoinduced transition always leads to a phase that, in any case, exists in the thermal cycle. Here we report the first exception to such an established principle. The employed guest±host system containing photoactive azobenzene guest molecules does not exhibit the smectic A phase in the absence of UV radiation. However, the smectic A phase is induced and stabilized only in the presence of UV light. To explain this dynamic self-assembly into a layered phase from a simple orientationally ordered fluid phase, we propose an argument based on photoinduced nanophase segregation and a frustrated spin-gas model.Research on materials which exhibit photostimulated changes in their structural, optical, or electrical properties is being pursued aggressively.[1±3] Liquid crystals (LCs) as photoactive media have attracted significant attention in this regard owing to the combination of molecular motion [4] that could result from the action of light and the self-assembling nature of these structured fluids. On the other hand, phase segregation as a mechanism on different length scales plays a very important role in the formation of a variety of LC structures, even to the extent of being the basis of realizing certain LC phases. A more interesting aspect is the control of nanoscalelevel segregation by external means. Such a phenomenon has been observed, for example, in electrospun fibers containing carbon nanotubes, [5] in molecule-thick elastomers with interesting microtribological properties, [6] and in the appearance of chirality in achiral systems. [7] From a device-application point of view, the combination of self-assembly and phase segregation has been well exploited in optical shutters formed by polymer-dispersed LCs, [8] very high-charge-mobility devices with columnar LCs, [9] etc.An important interplay between light and the structure of LCs was first observed by Folks et al. [10] and has been excellently explained by the simulation studies of Lansac et al., [11] who introduced the concept ...

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Cited by 35 publications

References 21 publications

Study on the tribological behaviors of polyelectrolyte multilayers containing copper hydroxide nanoparticles

Study on the tribological behaviors of polyelectrolyte multilayers containing copper hydroxide nanoparticles

Tribological properties of bio-mimetic nano-patterned polymeric surfaces on silicon wafer

Dynamic Self‐Assembly of the Liquid‐Crystalline Smectic A Phase

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