Room‐Temperature Synthesis of Metal Borides.

Kapfenberger, Christine; Hofmann, Kathrin; Albert, Barbara

doi:10.1002/chin.200344025

Cited by 2 publications

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“…Typical synthesis routes employ high reaction temperatures and do not allow for a directed synthesis of particles that are well-defined in terms of size, shape, uniformity, phase purity, or crystallinity. Formation of metal boride nanoparticles in solvents has been described occasionally, but an interaction of borides with biological material or bio-molecules like peptides was unknown before [ 4 , 5 ]. To the best of our knowledge, the present study is the first to identify peptides that bind specifically to amorphous and to crystalline Ni 3 B nanoparticles.…”

Section: Discussionmentioning

confidence: 99%

“…The Ni 3 B nanoparticles were synthesised from NaBH 4 (Alfa Aesar, 97%) and NiCl 2 × 6 H 2 O (Grüssing GmbH, 98%) in aqueous solution at about 0°C following a synthesis route described earlier [ 5 ]. According to this procedure amorphous Ni 3 B is formed primarily, which is transformed into the crystallised Ni 3 B sample at 490°C in vacuum (5 × 10 -3 mbar, 18 h).…”

Section: Methodsmentioning

confidence: 99%

“…The X-ray diffraction pattern of the annealed, crystalline sample allows for its identification as Ni 3 B (see Additional file 1 ). In previous work, we have shown using methods like X-ray diffraction, energy-dispersive X-ray spectroscopy, X-ray absorption spectroscopy, scanning and transmission electron microscopy, and energy-loss electron spectroscopy that the corresponding amorphous phase actually consists of the same boride as the crystalline modification [ 5 , 7 ]. For the phage display the amorphous Ni 3 B nanoparticles were used after extensive washing with deionized water and drying in a desiccator under vacuum.…”

Section: Methodsmentioning

confidence: 99%

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Selection of peptides binding to metallic borides by screening M13 phage display libraries

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BackgroundMetal borides are a class of inorganic solids that is much less known and investigated than for example metal oxides or intermetallics. At the same time it is a highly versatile and interesting class of compounds in terms of physical and chemical properties, like semiconductivity, ferromagnetism, or catalytic activity. This makes these substances attractive for the generation of new materials. Very little is known about the interaction between organic materials and borides. To generate nanostructured and composite materials which consist of metal borides and organic modifiers it is necessary to develop new synthetic strategies. Phage peptide display libraries are commonly used to select peptides that bind specifically to metals, metal oxides, and semiconductors. Further, these binding peptides can serve as templates to control the nucleation and growth of inorganic nanoparticles. Additionally, the combination of two different binding motifs into a single bifunctional phage could be useful for the generation of new composite materials.ResultsIn this study, we have identified a unique set of sequences that bind to amorphous and crystalline nickel boride (Ni3B) nanoparticles, from a random peptide library using the phage display technique. Using this technique, strong binders were identified that are selective for nickel boride. Sequence analysis of the peptides revealed that the sequences exhibit similar, yet subtle different patterns of amino acid usage. Although a predominant binding motif was not observed, certain charged amino acids emerged as essential in specific binding to both substrates. The 7-mer peptide sequence LGFREKE, isolated on amorphous Ni3B emerged as the best binder for both substrates. Fluorescence microscopy and atomic force microscopy confirmed the specific binding affinity of LGFREKE expressing phage to amorphous and crystalline Ni3B nanoparticles.ConclusionsThis study is, to our knowledge, the first to identify peptides that bind specifically to amorphous and to crystalline Ni3B nanoparticles. We think that the identified strong binding sequences described here could potentially serve for the utilisation of M13 phage as a viable alternative to other methods to create tailor-made boride composite materials or new catalytic surfaces by a biologically driven nano-assembly synthesis and structuring.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Selection of peptides binding to metallic borides by screening M13 phage display libraries

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“…Ni 3 B'in kristal yapısı, Fe 3 C sementit tipi ortorombiktir, yani Ni 3 B, çelik ve dökme demirler içerisinde bulunan Fe 3 C sementit yapısı ile kristalografik olarak izotipiktir. Ni 3 B'de her bir bor atomu, dokuz Ni atomu ile düzene girer, koordine olur [27], böylece Ni 3 B trigonal ya da üçer şapkalı prizmatik bir düzen oluşturur [28].  Bu çalışmadan elde edilen sonuçlar dikkate alındığında, saf titanyum üzerine büyütülen akımsız Ni-B kaplamaların ısıl işleme tabi tutulmaları halinde, saf titanyumun sertliğini ve aşınma direncini artıracağı kanaatine varılmıştır.…”

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“…Kaplama öncesi ve sonrası yüzey pürüzlülüğünün tespiti için ise Time TR-200 profilometre cihazı kullanıldı. [27], böylece Ni 3 B trigonal ya da üçer şapkalı prizmatik bir düzen oluşturur [28].…”

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Isıl İşlemin Akımsız Ni-B Kaplanan Saf Titanyumun Yapısına Etkisi

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2014

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖZETSaf titanyum, düşük ağırlığı nedeniyle sanayide çok geniş kullanım potansiyeline sahiptir, fakat diğer taraftan düşük sertlik ve aşınma direnci, yüksek sıcaklıklarda zayıf korozyon direnci ve yüksek maliyet gibi taşıdığı bazı dezavantajlar nedeniyle kullanımı hala sınırlı olmaya devam etmektedir. Saf titanyumun bu zayıf yanlarını güçlendirmek amacıyla akımsız Ni-B kaplama alternatif çözümlerden biri olabilir. Bu çalışmada, saf titanyum üzerine akımsız kaplama yöntemi ile Ni-B kaplamalar yapılmış ve 450°C, 650°C ve 850°C sıcaklıklarda ısıl işlem uygulanmıştır. Isıl işlem uygulanmayan ve uygulanan bu kaplamalar, yapısal olarak SEM (taramalı elektron mikroskop) ve XRD (X ışını kırınım ölçer) ile karakterize edilmiştir. Kaplamaların ısıl işleme bağlı olarak amorf karakterden belirgin kristalin bir yapıya dönüştüğü gözlenmiştir.Anahtar kelimeler: Saf titanyum, akımsız Ni-B, kaplama, ısıl işlem, XRD, SEM EFFECT OF HEAT TREATMENT ON STRUCTURE OF ELECTROLESS Ni-B COATED PURE TITANIUM ABSTRACTPure titanium has a very large potential for use industrially due to its low weight, however, its usage continues to be limited because it possesses some disadvantages such as low hardness and wear resistance, weak corrosion resistance in high temperatures and high cost. In order to strengthen these weaknesses of pure titanium, electroless Ni-B deposition process, may be an alternative solution. In this study, the Ni-B coatings were deposited on pure titanium and annealed at the temperatures of 450°C, 650°C and 850°C. The non-heat treated and heat treated coatings were structurally characterized via SEM (scanning electron microscope) and XRD (x ray diffraction). These coatings transformed from amorphous structure to a pronounced crystalline structure depending on heat treatment.

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Room‐Temperature Synthesis of Metal Borides.

Cited by 2 publications

References 1 publication

Selection of peptides binding to metallic borides by screening M13 phage display libraries

Selection of peptides binding to metallic borides by screening M13 phage display libraries

Isıl İşlemin Akımsız Ni-B Kaplanan Saf Titanyumun Yapısına Etkisi

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