Materials Literature
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Many properties of a composite material depend on the nature of the interface between the different components. To study the effect of filler surface chemistry, composites of cellulose acetate butyrate and both native and surface-trimethylsilylated cellulose nanocrystals from bacterial cellulose were investigated by d…
This chapter will give an idea of how the addition of microcrystalline cellulose (MCC) will affect the transparency, mechanical, thermal and barrier properties of biopolymers. It will also provide information on the production and structure of these nanocomposites. Two biopolymer matrices were used in this study, poly…
Abstract Macroscopic vanadium oxide fibers have been fabricated by an extrusion process. By varying the shear rate associated with the gel extrusion process we have been able to tune the diameter and transversal geometry of the fibers at macroscopic length scales. At the mesoscopic length scale, small‐angle X‐ray scat…
Pressure-induced superconducting behavior was found in two anion radical salts, EtMe3Z[Pd(dmit)2]2 (dmit = 1,3-dithiole-2-thione-4,5-dithiolate, Z = P, As), that are Mott insulators and exhibit different magnetic and structural transitions at ambient pressure.
Abstract Third‐order nonlinear and linear optical properties ofnickel(II) and copper(II) complexes with salen ligands, functionalised with electron donor/acceptor groups (DA‐salen), have been investigated in solution by the Z‐scan technique using an Nd:YAG laser ( λ inc = 1064 nm) and UV/Vis spectroscopy. The [M(DA‐ s…
We present a simple “top-down/bottom-up” strategy to fabricate nano- and micropatterned polymer brush arrays composed of pH- and salt-sensitive, weak polyelectrolyte copolymers [poly( N -isopropylacrylamide- co -methacrylic acid, 3:1, poly(NIPAAM- co -MAA)]. In our approach, a silicon surface is first patterned with g…
Abstract Using molecular dynamics simulations with an analytical embedded‐atom method (MAEAM) model, the diffusion behavior of helium atoms at two Σ = 5 symmetric grain boundaries of Ni was investigated in the present paper. The simulations demonstrate that the interstitial helium atoms are stable at the grain boundar…
Molecular dynamics (MD) methods for calculating the melting point of complex molecular and ionic solids and nanoparticles are described. Various approaches for simulating melting and computing the thermodynamic melting point are discussed along with some force fields that have been used in simulations of the melting o…
The goal of this work has been to prepare cellulose nanocomposites of polylactic acid (PLA), cellulose nano whiskers (CNW) and microfibers (MF). Nanocomposites were prepared by pumping an aqueous dispersion of MF and CNW into the PLA during extrusion. The prepared materials were studied using different microscopy meth…
We applied periodic density-functional theory (DFT) to investigate the dehydrogenation of ethanol on a Rh/CeO2 (111) surface. Ethanol is calculated to have the greatest energy of adsorption when the oxygen atom of the molecule is adsorbed onto a Ce atom in the surface, relative to other surface atoms (Rh or O). Before…
Ferromagnetism at room temperature is observed in one case whereas paramagnetism down to $12\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ is observed in the second case when polycrystalline ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}\mathrm{O}$ is synthesized under almost identical conditions. Identical x-ray diffract…
Various defect structures in a symmetric block copolymer self-assembled in thin films on neutral homogeneous and chemically nanopatterned surfaces were investigated. On neutral homogeneous surfaces, a lamellar morphology lacking long-range order was observed with a high density of defects such as dislocations and disc…
Bacterial cellulose is a natural nanomaterial produced by strains of the bacterium Acetobacter xylinum in static, shaken and agitated cultures. With fiber dimension of ~30 nm and being very hydrophilic, it is ideally suited for a broad range of biomedical applications. The bacterial cellulose fiber has a high degree o…
Dissipative particle dynamics (DPD) simulation is used to investigate solvent flow through a slit channel grafted with stimuli-responsive polymer brushes. The coated channel can regulate solvent permeability when, in response to stimuli, the grafted polymer brush undergoes conformational changes. The effects of the gr…
New low-molecular-weight gelators can be discovered by an approach that integrates classical methods for identifying potential gelators with strategies recently developed by crystal engineers to build porous molecular networks. This hybrid approach has yielded a potent new class of selective gelators based on salts of…
This chapter will introduce the reader to the topic of nanocomposites based on cellulose and also give a short description of the content of this book. This is a relatively new research field and there is no other book available on this topic. There is a growing interest on cellulose nanocomposites in developed and de…
Novel heterocyclic quinol-type fluorophores (4 a-c) and (5 a-c) that contain substituents (R = Me, Bu, Ph) with nonconjugated linkages to the chromophore skeleton have been synthesized and their photophysical properties have been investigated in solution and in the solid state. Considerable differences in the absorpti…
Core-shell micro/nanostructured and electromagnetic functionalized polypyrrole (PPy) composites were prepared by a self-assembly process associated with the template method in the presence of p-toluenesulfonate acid (p-TSA) as the dopant, in which the spherical hydroxyl iron (Fe[OH], 0.5-5 microm in diameter) function…
The interplay between liquid-liquid phase separation (LLPS) and crystallization at several compositions in statistical copolymer blends of poly(ethyleneco-hexene) and poly(ethylene-cobutene) has been examined by optical microscopy (OM), atomic force microscopy (AFM), and differential scanning calorimetry (DSC). The ph…
A very fast self-combustion reaction was applied for the first time to the synthesis of a series of magnetic CoFe 2 O 4 −SiO 2 nanocomposites in a wide range of compositions (from 5 to 50 wt % CoFe 2 O 4 ). Combining a gelation method that adopts metal nitrates, citric acid and tetraethoxysilane as precursors with con…