Physical–Chemical Exfoliation of n-Alkylamine Derivatives of Layered Perovskite-like Oxide H2K0.5Bi2.5Ti4O13 into Nanosheets

In the present work, we report the results on exfoliation and coating formation of inorganic–organic hybrids based on the layered perovskite-like bismuth titanate H2K0.5Bi2.5Ti4O13·H2O that could be prepared by a simple ion exchange reaction from a Ruddlesden–Popper phase K2.5Bi2.5Ti4O13. The inorganic–organic hybrids were synthesized by intercalation reactions. Exfoliation into nanosheets was performed for the starting hydrated protonated titanate and for the derivatives intercalated by n-alkylamines to study the influence of preliminary intercalation on exfoliation efficiency. The selected precursors were exfoliated in aqueous solutions of tetrabutylammonium hydroxide using facile stirring and ultrasonication. The suspensions of nanosheets obtained were characterized using UV–vis spectrophotometry, dynamic light scattering, inductively coupled plasma spectroscopy, and gravimetry. Nanosheets were coated on preliminarily polyethyleneimine-covered Si substrates using a self-assembly procedure and studied using atomic force and scanning electron microscopy.

Download Full-text

Carbon Nanotube-Prussian Blue Spongiform Adsorbent for Selective Capture of Cesium and Strontium

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.799-800.3 ◽

2015 ◽

Vol 799-800 ◽

pp. 3-7 ◽

Cited By ~ 1

Author(s):

Jun Li ◽

Wu Ting Shen ◽

Qing Long ◽

Yun Hua Qin ◽

Yao Dong Dai

Keyword(s):

Carbon Nanotube ◽

Prussian Blue ◽

Inductively Coupled Plasma ◽

The Novel ◽

Adsorption Selectivity ◽

Inductively Coupled ◽

Ion Exchange Reaction ◽

Mixed Aqueous Solution ◽

Radioactive Wastewater ◽

Nickel Ferrocyanide

Prussian blue analogue nickel ferrocyanide (NiPB) decorated carbon nanotube sponge (CNT sponge) was prepared as a newly designed spongiform adsorbent. This composite material was characterized by scanning electron microscopy (SEM), inductively coupled plasma (ICP) and tested in adsorption experiments. Results show that the CNT-NiPB sponge was equipped with large holes and porous structure, a large number of MWNTs and NiPB particles uniformly deposited on the surface and internal cavities. This adsorbent CNT-NiPB sponge showed a good adsorption selectivity of cesium and strontium in mixed aqueous solution, which is mainly induced by the ion exchange reaction of NiPB and metal ions. The novel spongiform adsorbent might have a promise prospect in radioactive wastewater treatment applications.

Download Full-text

Influence of diatomite microstructure on its adsorption capacity for Pb(II)

Science of Sintering ◽

10.2298/sos0903309n ◽

2009 ◽

Vol 41 (3) ◽

pp. 309-317 ◽

Cited By ~ 39

Author(s):

S. Nenadovic ◽

M. Nenadovic ◽

R. Kovacevic ◽

Lj. Matovic ◽

B. Matovic ◽

...

Keyword(s):

Inductively Coupled Plasma ◽

Atomic Emission ◽

Emission Spectrometry ◽

Wastewater Remediation ◽

X Ray Diffraction ◽

Plasma Atomic Emission Spectrometry ◽

Force Microscopy ◽

Inductively Coupled ◽

Atomic Force ◽

Treated Sample

The effect of microstructural changes caused by mechanical modification on adsorption properties of diatomite samples were investigated. The microstructure has been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM) while the degree of metal adsorption was evaluated by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP AES). The results show that metal sorption capacity of diatomite is considerably improved after mechanical modification and it can be attributed to amorphysation of the material. Immobilization efficiency increased from 22% for untreated to 81% for the treated sample after 5h at BPR 4.This qualifies natural diatomite as a material for wastewater remediation.

Download Full-text

Plasma-Enhanced Chemical Vapor Deposition of High Quality Cubic BN Films with an Intermediate Layer of Turbostratic BN Thinner than 3 nm

MRS Proceedings ◽

10.1557/proc-750-y5.10 ◽

2002 ◽

Vol 750 ◽

Author(s):

Hangsheng Yang ◽

Chihiro Iwamoto ◽

Toyonobu Yoshida

Keyword(s):

Chemical Vapor Deposition ◽

Vapor Deposition ◽

Intermediate Layer ◽

Inductively Coupled Plasma ◽

Cubic Boron Nitride ◽

Chemical Vapor ◽

Amorphous Layer ◽

Inductively Coupled ◽

Si Substrates ◽

Pre Treatment

ABSTRACTCubic boron nitride (cBN) thin films were deposited on silicon wafers by low-pressure inductively coupled plasma-enhanced chemical vapor deposition (ICP-CVD). By using special substrate pre-treatment processes including positive biasing treatment in H2 plasma or 1200 K pre-heating in H2 atmosphere followed by an N2 plasma treatment, turbostratic BN (tBN) intermediate layer was revealed to directly grow on Si substrates without an initial amorphous layer. The thickness of the tBN transition layer can be reduced to less than 3 nm.

Download Full-text

Partitioning and Surficial Segregation of Trace Elements in Iron Oxides in Hydrothermal Fluid Systems

Minerals ◽

10.3390/min11010057 ◽

2021 ◽

Vol 11 (1) ◽

pp. 57

Author(s):

Nikolay Smagunov ◽

Vladimir Tauson ◽

Sergey Lipko ◽

Dmitriy Babkin ◽

Taisa Pastushkova ◽

...

Keyword(s):

Trace Elements ◽

Inductively Coupled Plasma ◽

Absorption Spectrometry ◽

X Ray ◽

Force Microscopy ◽

Inductively Coupled ◽

Atomic Force ◽

Fluid Systems ◽

Nonautonomous Phase ◽

Plasma Mass Spectrometry

Partitioning experiments were done by hydrothermal synthesis of crystals containing trace elements (TEs) by internal sampling of fluid at the temperature of 450 °C and pressure of 1 kbar. The crystal phases obtained were magnetite, hematite, and Ni-spinel, which were studied using X-ray diffraction (XRD), X-ray electron probe microanalysis (EPMA), laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), atomic absorption spectrometry (AAS), and atomic force microscopy (AFM). The solutions from the sampler’s fluid probes were analysed by AAS for TEs included elements of the iron group plus aluminium. The highest co-crystallisation coefficients of TE and Fe between mineral and fluid (DTE/Fe) in magnetite were measured for V, Al, Ni and Cr (in decreasing order of n units in value), a lower value was observed for Co (2 × 10−1), and still lower values for Ti, Zn, and Mn (n × 10−2–10−3). In hematite, DTE/Fe values were highest for Al and V (order of n units in value), while lower values characterised Ti, Cr, and Co (n × 10−1–10−3), and the lowest values were exhibited by Cu, Mn, and Zn (n × 10−5). Copper was confirmed to be the most incompatible with all minerals studied; however, Cu had a high content on crystal surfaces. This surficial segregation contributes to the average TE concentration even when a thin layer of nonautonomous phase (NAP) is enriched in the element of interest. The accumulation of TEs on the surface of crystals increased bulk content 1–2 orders of magnitude above the content of structurally-bound elements even in coarse crystals. The inverse problem—evaluation of TE/Fe ratios in fluids involved in the formation of magnetite-containing deposits—revealed that the most abundant metals in fluids were Fe followed by Mn, Zn, and Cu, which comprised 10 to 30% of the total iron content.

Download Full-text

Post-CMP Cleaning of Atom-Scale Planarization Surface of Computer Hard Disk Substrate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.97-101.1181 ◽

2010 ◽

Vol 97-101 ◽

pp. 1181-1185

Author(s):

Nai Jing Bu ◽

Hong Lei ◽

Ru Ling Chen ◽

Xiao Li Hu

Keyword(s):

Inductively Coupled Plasma ◽

Hard Disk ◽

Atomic Emission ◽

Force Microscopy ◽

Inductively Coupled ◽

Atomic Force ◽

Cleaning Solution ◽

Hard Disk Substrate ◽

Cleaning Methods ◽

Disk Substrate

At present, the surface of computer hard disk substrate has reached atom-scale planarization after chemical mechanical polishing (CMP). Post-CMP cleaning is one of the key factors influencing the CMP performances. During cleaning, cleaning solution and cleaning methods play a key role in cleaning quality and effectiveness. In the present paper, alkylpolyoxyethylene alcohol carboxylic ester (FAC) surfactant was synthesized and its cleaning performances on atom-scale planarization surface of computer hard disk substrate were investigated. Microscope analysis indicated that the prepared detergent containing FAC surfactant exhibited improved cleaning performances compared with the commercial detergent. Further, inductively coupled plasma (ICP) atomic emission spectrometer, auger electron spectrogram (AES) and atomic force microscopy (AFM) analyses after static corrosion test showed that the prepared cleaning solution had lower corrosion to hard disk substrate.

Download Full-text

Low temperature high-rate growth of crystalline Ge films on quartz and crystalline Si substrates from VHF inductively-coupled plasma of GeH4

Thin Solid Films ◽

10.1016/j.tsf.2008.08.027 ◽

2008 ◽

Vol 517 (1) ◽

pp. 216-218 ◽

Cited By ~ 6

Author(s):

Tsutomu Sakata ◽

Katsunori Makihara ◽

Hidenori Deki ◽

Seiichiro Higashi ◽

Seiichi Miyazaki

Keyword(s):

Low Temperature ◽

Inductively Coupled Plasma ◽

High Rate ◽

Inductively Coupled ◽

Si Substrates

Download Full-text

Preparation of the Layer-by-Layer Deposited Silver Nanoparticles Multilayer Films on Poly(ethylene Terephalate) Substrate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.189-193.1362 ◽

2011 ◽

Vol 189-193 ◽

pp. 1362-1365

Author(s):

De Shan Cheng ◽

Xiao Yan Liu ◽

Ji Hong Wu ◽

Wei Dong Yu

Keyword(s):

Silver Nanoparticles ◽

Self Assembly ◽

Inductively Coupled Plasma ◽

Multilayer Films ◽

Layer By Layer ◽

Inductively Coupled ◽

Assembly Technology ◽

Poly Ethylene ◽

Pet Film ◽

Pet Substrate

This research presented the preparation of multilayer films on poly(ethylene terephalate) (PET) Substrate by electrostatic self-assembly technology. The silver nanoparticles were characterized by UV–vis spectrometry and scanning electron microscopy (SEM). The sequential dipping of hydrolyzed PET substrate in dilute solutions of poly(diallyldimethyl ammonium chloride)(PDDA) and silver nanoparticles to fabricate multilayer films. The multilayer films were monitored by UV–vis spectrometry, the surface plasmon resonance (SPR) obtained at 420 nm confirmed the existence of nanosilver on the PET film. The silver nanoparticles were also verified by the Inductively Coupled Plasma Spectrometry (ICP) and thermogravimetric analysis of the multilayer film. The transmission spectra indicated that the PET films contained silver nanoparticles have better UV protection property.

Download Full-text

Crystallization of BaTiO3 Thin Films Prepared by Metalorganic Decomposition with Hydrothermal Treatment at 140°C

MRS Proceedings ◽

10.1557/proc-688-c7.26.1 ◽

2001 ◽

Vol 688 ◽

Author(s):

Zhiqiang Wei ◽

Minoru Noda ◽

Masanori Okuyama

Keyword(s):

Thin Films ◽

Hydrothermal Treatment ◽

Photoelectron Spectroscopy ◽

Inductively Coupled Plasma ◽

Perovskite Phase ◽

Processing Temperature ◽

Structural Development ◽

X Ray ◽

Inductively Coupled ◽

Si Substrates

AbstractBaTiO3 (BTO) thin films with perovskite structure have been prepared on Pt/Ti/SiO2/Si substrates using a combined process of a conventional MOD (metal organic decomposition) process and a hydrothermal treatment. The BTO thin films with polycrystalline structure are grown on Pt/Ti/SiO2/Si substrates at a processing temperature of 140°C. The structural development, stoichiometry, spectroscopic, and dielectric properties of the BTO thin films have been systematically investigated. X-ray diffraction patterns show that well-developed crystallites with a pure perovskite phase have been formed. ICP (Inductively coupled plasma) and XPS (x-ray photoelectron spectroscopy) results show that stoichiometric BTO thin films were obtained.

Download Full-text

Low Loss High Mesa Optical Waveguides Based on InGaAsP/InP Heterostructures

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2006.17983 ◽

2006 ◽

Vol 6 (11) ◽

pp. 3562-3566

Author(s):

W. S. Choi ◽

J. H. Jang ◽

B.-A. Yu ◽

Y. L. Lee ◽

W. Zhao ◽

...

Keyword(s):

Optical Waveguides ◽

Inductively Coupled Plasma ◽

Three Dimensional ◽

Low Loss ◽

Sidewall Roughness ◽

Scattering Loss ◽

Inductively Coupled ◽

Atomic Force ◽

Fabry Perot ◽

Propagation Losses

Low loss high mesa optical waveguides were fabricated on InGaAsP/InP heterostructures by utilizing inductively-coupled-plasma reactive ion etching (ICP-RIE) and electron beam lithography technique. The fabrication process was optimized by measuring sidewall roughness of deep-etched waveguides. Atomic force microscope loaded with carbon nanotude was used to obtain three-dimensional image of the etched sidewall of waveguides. The obtained statistical information such as rms roughness and correlation length was used to theoretically calculate scattering loss of waveguides. Several waveguides with different number of sharp bends and the length were fabricated and their propagation losses were measured by modified Fabry-Perot method. The measured propagation losses were compared with theoretically calculated losses.

Download Full-text

Self-Assembly of Perovskite Nanosheet Colloid at Room Temperature

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.301.227 ◽

2006 ◽

Vol 301 ◽

pp. 227-230

Author(s):

Kenji Toda ◽

Hiroki Sato ◽

Akira Sugawara ◽

Saori Tokuoka ◽

Kazuyoshi Uematsu ◽

...

Keyword(s):

Ion Exchange ◽

Exchange Reaction ◽

Self Assembly ◽

Room Temperature ◽

Spectroscopic Studies ◽

Layered Perovskite ◽

X Ray Diffraction ◽

X Ray ◽

Ion Exchange Reaction ◽

Perovskite Materials

We present a new method for soft chemical synthesis of perovskite materials. Perovskite K1-xLixNbO3 powders are produced by an ion-exchange reaction of layered perovskite precursor, K2NbO3F, with lithium chloride in water at room temperature. X-ray diffraction and X-ray fluorescent spectroscopic studies show that a mechanism of the ion-exchange reaction is a self-assembly between the perovskite nanosheets in aqueous solution.

Download Full-text