A Novel Graphdiyne-Based Catalyst for Effective Hydrogenation Reaction

The platinum nanoparticles (Pt NPs) hybrided with nanostructured carbon materials with high stability are important for catalyzing hydrogenation reaction. Here we reported the fabrication of ultrastable Pt NPs anchored on graphdiyne, in which the strong interactions induced by the porous graphdiyne can prevent the thermal migration of Pt nanoparticles on the graphdiyne surface, exploiting the strong charge transfer interactions from Pt NPs to GDY substrate to tune the electron density of Pt NPs. Pt NPs catalyst with size of 2–3 nm showed high performance on hydrogenation of aldehydes and ketones to the corresponding alcohols compared with commercial Pt–C. Our results indicated that graphdiyne is a promising substrate for constructing metal nanoparticle-based heterogeneous catalysts, especially for those requiring strong interactions between metal nanoparticles and reactants

Intramolecular Triplet Energy Transfer in Anthracene-Based Platinum Acetylide Oligomers

Platinum acetylide oligomers that contain an anthracene moiety have been synthesized and subjected to photophysical characterization. Spectroscopic measurement and DFT calculations reveal that both the singlet and triplet energy levels of the anthracene segment are lower than those of the platinum acetylide segment. Thus, the platinum acetylide segment acts as a sensitizer to populate the triplet state of the anthrancene segment via intramolecular triplet–triplet energy transfer. The objective of this work is to understand the mechanisms of energy-transfer dynamics in these systems. Fluorescence quenching and the dominant triplet absorption that arises from the anthracene segment in the transient absorption spectrum of <b>Pt4An</b> give clear evidence that energy transfer adopts an indirect mechanism, which begins with singlet–triplet energy transfer from the anthracene segment to the platinum acetylide segment followed by triplet–triplet energy transfer to the anthracene segment

Self-Assembly of Wheel-Shaped Nanographdiynes and Self-Template Growth of Graphdiyne

Graphdiyne (GDY) multilayers show stacking-style-dependent physical properties; thus, controlling the stacking style of nanostructures is crucial for utilizing their electrical, optical, and transport properties in electro-optical devices. Herein, we report the assemblies of nanographdiynes decorated with substituents with different steric hindrances to adjust the stacking style. We show that the π-stacked aggregates were influenced by peripheral substituents and the substrate. Steric hexaterphenyl-substituted nanoGDY scaffolds led to dimer structures stacked in the AB-3 configuration with a twist angle of 26.01° or the AB-1 configuration with an in-plane shift along one diyne link. With the interval replacement of steric substituents with long C12 alkyl chains, nanoGDYs were stacked in the AB-2 configuration to decrease the steric congestion, eventually leading to one-dimensional (1D) nanofibrous aggregates. Self-assembly in the presence of substrates can result in ABC-stacked nanoGDYs, which endowed us with the possibility of using nanoGDY as the template for GDY growth in a homogeneous reaction. High-resolution transmission electron microscopy (HRTEM), powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and near-infrared–ultraviolet–visible (NIR–UV–vis) absorption spectroscopy indicate that the crystalline GDY prepared in this way is a 1.18 eV bandgap semiconductor

Additional file 1: of Genotype × site × silviculture interactions in radiata pine: knowledge, working hypotheses and pointers for research§

Three tables listing known or postulated first-order interactions involving genotype, site and silviculture in radiata pine.  These show provisional information, and as such are offered as the framework for updating, through further collation of existing literature, fresh data analysis, and fresh experimental work. Table S1. Known or postulated genotype × site interactions in radiata pine, in terms of role and effects of site on expression of genotypic differences for specific tree variables (Carson 1989; Kumar and Burdon 2010).  Table S2. Known or postulated genotype × silviculture interactions in radiata pine, in terms of role and effects of silviculture on expression of genotypic differences for specific tree variables.  Table S3. Known or postulated silviculture × site interaction in radiata pine, in terms of how impacts of site factors on means and expression of differences for specific tree variables are affected by silviculture (lower stockings/heavier thinning regimes, or fertiliser use). (DOCX 33 kb

phenotypes

This is phenotype data used in this study

pedigree_maskedID

This is pedigree file

Self-Assembly of Amphiphilic Homopolymers Bearing Ferrocene and Carboxyl Functionalities: Effect of Polymer Concentration, β‑Cyclodextrin, and Length of Alkyl Linker

Three new acrylamide monomers containing ferrocene and <i>tert</i>-butyl ester groups were first synthesized via multistep nucleophilic substitution reaction under mild conditions followed by reversible addition–fragmentation chain transfer (RAFT) homopolymerization to give well-defined homopolymers with narrow molecular weight distributions (<i>M</i>_w/<i>M</i>_n ≤ 1.36). The target amphiphilic homopolymers were obtained by the acidic hydrolysis of <i>tert</i>-butyoxycarbonyls to carboxyls in every repeating unit using CF₃COOH. The self-assembly behaviors of these amphiphilic homopolymers bearing both ferrocene and carboxyl moieties in each repeating unit in aqueous media were investigated by transmission emission microscopy (TEM), dynamic light scattering (DLS), and atomic force microscopy (AFM). Large compound micelles with different morphologies were formed by these amphiphilic homopolymers, which consist of the corona formed by hydrophilic carboxyls and the core containing numerous reverse micelles with hydrophilic islands of carboxyls in continuous hydrophobic phase of ferrocene-based segments. The morphologies of the formed micelles could be tuned by the concentration of amphiphilic homopolymers, pH value of the solution, the length of −CH₂ linker between ferrocene group and carboxyl, and the amount of β-cyclodextrin (β-CD)

Soluble Perfluorocyclobutyl Aryl Ether-Based Polyimide for High-Performance Dielectric Material

High durability of low-<i>k</i> value is a desired property for dielectrics serving under humid conditions, because absorbing a small amount of moisture by the material can considerably increase the <i>k</i> value so as to result in function deterioration. Aiming to develop a dielectric polymer with superior durability of low-<i>k</i> value and high thermal stability, a perfluorocyclobutyl (PFCB) biphenyl ether-based polyimide, PFCBBPPI, was synthesized. This polymer possesses a <i>T</i>_g of 310.3 °C and a 5% weight loss temperature of 510.5 °C. PFCBBBPPI exhibited an extremely low water uptake of 0.065 ± 0.018%, representing the best water resistance in polyimides. The increasing percentage in <i>k</i> value was below 2% for PFCBBPPI film exposed to moisture under various humidity conditions for 6 h. PFCBBPPI film equilibrated at 75% R.H. for 2 weeks still kept its <i>k</i> value below 2.50, remarkably outperforming the Kapton film. The remarkable water resistance and resulting high durability of low-<i>k</i> property displayed by PFCBBPPI are originated from the hydrophobic nature and small free volume fraction of the polymer, as confirmed by contact angle test and positron annihilation lifetime spectroscopy results. The outstanding moisture resistance and overall performance of PFCBBPPI make it a suitable candidate for dielectric applications under both dry and humid conditions

Targeted genetic gains for diameter-at-breast-height (DBH), wood density (DEN), predicted modulus of elasticity (PME), internal checking (IC), external resin bleeding (ERB), number of heartwood rings (NHR) in four desired-gain selection indices: A-D.

<p>Targeted genetic gains for diameter-at-breast-height (DBH), wood density (DEN), predicted modulus of elasticity (PME), internal checking (IC), external resin bleeding (ERB), number of heartwood rings (NHR) in four desired-gain selection indices: A-D.</p

Summary statistics of phenotypes assessed: Diameter-at-breast-height (DBH), wood density (DEN), predicted modulus of elasticity (PME), internal checking (IC), external resin bleeding (ERB), number of heartwood rings (NHR).

<p>Summary statistics of phenotypes assessed: Diameter-at-breast-height (DBH), wood density (DEN), predicted modulus of elasticity (PME), internal checking (IC), external resin bleeding (ERB), number of heartwood rings (NHR).</p