Reversible isomerization of a zwitterionic polysquaraine induced by a metal surface

Lu, Hsiao‐Chi; Whang, Wha–Tzong; Cheng, Bing‐Ming

doi:10.1039/c0jm03328f

Cited by 18 publications

(20 citation statements)

References 60 publications

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“…The fabrication of nanoarchitectures with catalytic active building blocks on the surfaces of the nanofibers of bulk cellulose‐rich substances to give a composite catalytic membrane (with good mechanical strength and flexibility) could provide a solution to this problem. According to this point of view, photocatalytic anatase‐titania/filter‐paper composite sheets were fabricated by hydrothermal treatment of ultrathin titania gel film pre‐coated nanofibers in filter paper ( Figure a), or by subjecting ultrathin titania gel film pre‐deposited filter paper to a solvo‐co‐hydrothermal treatment using titanium butoxide as the precursor to grow anatase‐titania nanocrystallites on the nanofiber surfaces . The resulting composites maintained the physical properties of the filter paper, and fine anatase‐titania nanocrystallites with nanometer sizes (20−50 nm or 2–5 nm, depending on the synthetic method employed) were uniformly anchored on the nanofiber surfaces, as demonstrated by the electron microscopy observations (Figures b, c).…”

Section: Photocatalysts Derived From Cellulose‐rich Substancesmentioning

confidence: 99%

Cellulose‐Rich Nanofiber‐Based Functional Nanoarchitectures

Huang

2015

Advanced Materials

117

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Surface self-assembly of functional molecules or nanoscale building blocks is an effective strategy for the syntheses of advanced materials. Natural cellulose-rich substances have unique macro-to-nano hierarchical structural features. The fabrication of nanoarchitectures, employing specific guest species on the surfaces of the fine structures of such substances, results in corresponding artificial nanomaterials that possess the chemical functionalities and physical properties of both sides. Metal oxide thin film coatings with nanometer precision on the nanofibers of bulk cellulose-rich substances not only yield replicas of nanostructured materials, but also make it possible for further assemblies of functional units on the surfaces. Hence, nanostructured metal oxides and further composites, as well as surface-functionalized cellulose-based composites are fabricated by employing cellulose-rich substances as templates or scaffolds. The three-dimensional cross-linked porous structures, with the high surface area of the resultant nanomaterials or composites, lead to superior performance when employed as photocatalysts, electrode materials, and sensing matrices, on which this report is focused.

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Section: Photocatalysts Derived From Cellulose‐rich Substancesmentioning

confidence: 99%

Cellulose‐Rich Nanofiber‐Based Functional Nanoarchitectures

Huang

2015

Advanced Materials

117

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“…Because the corrosion products of ZnCl 2 · 4Zn(OH) 2 and ZnCO 3 · 3Zn(OH) 2 have strong adhesive force and good insulativity and can blend the large quantity of microcrack which was generated in the procedure of coatings corrosion, the rate of corrosion is delayed and the corrosion resistance of the coatings is increased. [20] In addition, ZnO is a kind of semiconductor, generated by the hydrolyzation of Zn(OH) 2 or ZnCl 2 · 4Zn(OH) 2 , and it has greater electric conductivity than Zn(OH) 2 . But the nickel in the coatings can not only form the enrichment nickel layer, but also stabilize Zn(OH) 2 efficiently.…”

Section: Corrosion Productsmentioning

confidence: 99%

Study on corrosion resistance of electroplating zinc–nickel alloy coatings

Tian¹,

Xie²,

Wu³

et al. 2009

Surface & Interface Analysis

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Electrodeposited zinc-nickel alloy coatings have been widely adopted for surface treatment of automobile body steel sheet for high corrosion resistance. The corrosion behavior of the coatings has been related with the components of nickel, and the zinc-nickel alloy passive coatings have much higher corrosion resistance than that of zinc-nickel alloy coatings. In the present paper, the corrosion resistance behavior of the zinc-nickel alloy coatings obtained by new process and formulation has been studied by means of the electrochemistry test and neutral salt spray test. And it is discovered that the properties of corrosion resistance of zinc-nickel alloy passive coatings were better than that of zinc passive coatings, Cadmium passive coatings and alloys of electrodeposited cadmium-titanium. The components of corrosion productions, in terms of X-ray diffraction (XRD), are mainly ZnO, ZnCl 2 ·4Zn(OH) 2 and small quantity of 2ZnCO 3 · 3Zn(OH) 2 . The component of zinc-nickel alloy coatings has been investigated with Glow Discharge Optical Emission Spectrometry (GDA-750). And it is found that as the thickness of zinc-nickel alloy coatings increases, the component of zinc increases from beginning to end, but the peak value of nickel appears and an enrichment of nickel in the coatings comes into being. Because the electrodeposited zinc-nickel alloy coatings exhibit different alloy phases as a function of their alloy composition, in this paper, the crystal structure changing with the different component of nickel has been studied in terms of XRD. The result shows that electrodeposited zinc-nickel alloy has different phases: α-phase, a solid solution of zinc in nickel with an equilibrium solubility of about more than 79% nickel; γ -phase, an intermediate phase with a composition Ni 5 Zn 21 ; η-phase, a solid solution of nickel in zinc with less than 5% nickel; and δ-phase (Ni 3 Zn 22 ) appeared from η-phase to α-phase with increasing content of nickel.

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“…Since then the (undoped) electrical conductivities of pyrrole-derived squaraines have been reported thirteen times [15,17,[20][21][22]28,43,47,49,56,58,59,61], with the best conduction being no greater than 5 × 10 −4 S/cm [21]. The reported band gap for this type III polysquaraine 9 was 0.79 eV, the lowest recorded for any pyrrole-derived polysquaraine.…”

Section: Electrical Propertiesmentioning

confidence: 99%

“…The reason why this is important, particularly in this case, is because PMPS particles are very porous and can be collected, washed and dried while still containing significant amounts of reaction byproduct [92]. In terms of the micromolecular structure of pyrrole-derived polysquaraines, studies on type I polysquaraines have reported a switchable structure induced by both metal ions [42] and metal surfaces [47,65].…”

Section: Molecular Structurementioning

confidence: 99%

Pyrrolyl Squaraines–Fifty Golden Years

Lynch

2015

Metals

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Pyrrolyl squaraines, both dyes and polymers, were first reported in 1965 and since then a fascinating body of work has been produced investigating the chemistry of these interesting molecules. A major aspect of these molecules that makes them so appealing to those researchers who have contributed to this field over the last 50 years is their chemical versatility. In this review, subjects, such as the synthetic history, an understanding of the molecular structure, an overview of the optical properties, a discussion of both the electrical conduction properties, and magnetic properties, plus use of the particles of pyrrolyl squaraines, are presented. Furthermore, previously published results are not just presented; they are in certain cases collated and used to both highlight and explain important aspects of pyrrolyl squaraine chemistry.

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Reversible isomerization of a zwitterionic polysquaraine induced by a metal surface

Cited by 18 publications

References 60 publications

Cellulose‐Rich Nanofiber‐Based Functional Nanoarchitectures

Cellulose‐Rich Nanofiber‐Based Functional Nanoarchitectures

Study on corrosion resistance of electroplating zinc–nickel alloy coatings

Pyrrolyl Squaraines–Fifty Golden Years

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