Ferroelectric polarization can be used to assemble various organic and inorganic species and to create nanostructures with controlled properties. In this work, we used P(VDFTrFE) ultrathin films deposited by Langmuir-Blodgett technique as templates for the assembly of various phospholipids that are the essential components of cell membranes. It was observed that 1,2-Di-O-hexadecyl-sn-glycero-3-phosphocoline phospholipids (DHPC) form self-assembled structures (molecular domains) on bare P(VDF-TrFE) surfaces. These were revealed by the formation of homogenous and stable rounded blobs with diameters in the range 0.5-3 µm. Further, ferroelectric polymer films were polarized by the application of various voltages via conducting tip using Piezoresponse Force Microscopy (PFM) setup and PFM images were obtained showing controlled polarization distribution. After this, phospholipid molecules were deposited from the solution. Conventional Atomic Force Microscopy (AFM) experiments were then performed to assess the selectivity of the deposition process. It was observed that the deposition process is very sensitive to the concentration of the solution. The selective deposition was observed mainly at the polarization boundaries where the selectivity reached a maximum value of about 20-40%. In this way, the controlled assembly of organic molecules on the polymer surfaces could be achieved. In addition, the PFM tips could be functionalized by the phospholipids and switchable lines of the DHPC molecules on the P(VDF-TrFE) surface were then visualized by PFM.

The presented work shows the synthesis and characterization of Zn/Ti layered double hydroxide (LDH) intercalated with carbonate and dodecyl sulfate ions following its application as a functional filler in LDPE in order to improve the thermal properties and resistance degradation in UV-Vis radiation. X-ray diffractogram patterns of Zn/Ti LDH-CO3 and Zn/Ti LDH-DDS present basal spacing value in the order of 6.81 Å and 38.09 Å, respectively, indicating success in layered compound synthesis. LDPE nanocomposite containing hydrophobic and hydrophilic LDH presented a very well dispersed nanocomposite, as demonstrated in XRD and DSC results. The addition of only 1 % of LDH as filler into LDPE causes an increase of 5.43 oC in the thermal property. Zn/Ti LDH-DDS absorbs more light compared to the Zn/Ti LDH-CO3 due to the enhanced interlayer distance in the presence of DDS in the basal space of LDH, which further the intercalation process of polymer chains within the interlayer regions of LDH.

In this study, zinc layered hydroxide salts (Zn-LHS) intercalated with dodecyl sulfate (DDS) anion in nanocone morphology (LHS-NC) and conventional stone-like co-precipitation LHS phases (LHS-CO) were investigated as adsorbent of Orange G (OG) and Sunset Yellow (SY) dye. LHS-NC was prepared by urea hydrolysis method, while LHS-DDS was prepared by coprecipitation method. XRDP, FTIR, and SEM were used to characterize their structure and showed the formation of layered compounds with very well layered stacking with nanocone and conventional layer stone morphology. After OG and SY adsorption, the results (XRDP, FTIR, UV-Vis, Zetametry) showed that the Freundlich adsorption isotherms had been well fitted, and both OG and SY dyes were intercalated in interlayer space of LHS, where LHS-CO and LHS-NC present high uptake capability of SY dye remotion equal a 227.79 and 442.48 (mg g À 1 ) while OG adsorption capability were 2.52 and 6.39 (mg g À 1 ), respectively. For the kinetics study, the best fit was obtained by the pseudo-second-order model, whereas the results of intraparticle diffusion show a one-step adsorption process. Hence, this study demonstrated Zn-LHS in nanocone morphology, and conventional stone-like co-precipitation phase makes them potentially attractive adsorbents in water purification.

The 1,2,3-triazoles are an important class of organic compounds that are found in a variety of biologically active compounds. The most usual and efficient methodology to synthetize these compounds is the Copper-catalyzed Azide–Alkyne Cycloaddition (CuAAC), preferably by use of click chemistry principles. Therefore, the development of simple, robust, easily accessible and efficient materials as catalysts for this kind of reaction is highly desirable. In this sense, layered hydroxide salts (LHS) emerge as an interesting alternative for the click reaction. Thus, we describe herein the preparation and characterization of copper (II) layered hydroxide salts and their application as catalysts for the CuAAC reaction under solvent-free conditions. This synthetic methodology of CuAAC reaction is attractive as it follows several concepts of green chemistry, such as being easy to perform, allowing purification without chromatographic column, the process forming no sub-products, affording the desired 1,2,3-traizoles in the specific 1,4-disubstituted position in high yield, and having a short reaction time. Moreover, the photocatalysis for the degradation of methyl orange was also highly efficient using the same catalyst.

Hydrotalcite-type materials, or layered double hydroxide (LDH), are very promising in applying slow-release drug systems through ion exchange and delamination characteristics at acidic pH. In this paper, Zn/Al LDHs in 2:1 and 3:1 molar ratios intercalated with the drug ibuprofen (IBU) were added to chitosan/alginate membranes. In the release tests, an increase in the solubility of the drug in the membranes could be observed, and the percentage of drug release is lower than the percentage of drug release in the free samples. The following release percentages were obtained: 15.48% and 17.5% of the drug in water, and 23.22% and 26.25% of the drug in PBS buffer solution, respectively, for membrane samples containing Zn 2 Al-IBU and Zn 3 Al-IBU LDHs. Thus, the synthesized hybrid membranes (chitosan/alginate-LDH-IBU) are promising in the application as resorbable membranes for bone grafting with drug release.