The ability of high oxidation potential zinc porphyrins acting as electron donors in photoinduced electron-transfer reactions is investigated. Donor–acceptor dyads were assembled via metal–ligand axial coordination either pyridine or phenylimidazole functionalized fulleropyrrolidine with porphyrin different numbers halogen substituents on the meso-aryl rings. Optical absorption studies complex formation revealed relatively higher binding constants. Efficient quenching fluorescence was...

Abstract Bonding agents are auxiliary but critical additives in composite propellants. The bonding agent ameliorates the processing and mechanical performance of propellant through interfacial interaction between particulate fillers binder matrix. Several have been developed over years to treat dewetting problem solid propellant. In this review, we describe different types agents, their mechanism development An individual is discussed critically terms its strengths weaknesses. review...

Donor-acceptor dyads featuring near-IR sensitizers derived from thieno-pyrrole-fused BODIPY (abbreviated as SBDPiR) and fullerene, C60 have been newly synthesized characterized. Occurrence of ultrafast photoinduced electron transfer (PET) leading to the formation charge-separated state in these dyads, capable harvesting light energy region, is established femtosecond transient absorption studies.

We employed simple shear-force-dominated planetary ball milling to prepare graphene on a large scale (200 g per cycle) with less structural defects.

Abstract We report the synthesis, photophysical and electrochemical properties, in vivo fluorescence imaging of a series new thieno–pyrrole‐fused near‐infrared (NIR) BODIPY agents by using versatile intermediate as building block. The was rationally designed to bear bromo‐substituents absorb mid‐red region (635 nm) act an organic electrophile for development NIR multifunctional agents. use subsequent palladium‐catalyzed nucleophilic substitution reactions afforded highly conjugated BODIPYs....

Photoinduced electron transfer in self-assemblies of porphyrins ion-paired with ssDNA wrapped around single-wall carbon nanotubes (SWCNTs) has been reported. To accomplish the three-component hybrids, two kinds diameter-sorted semiconducting SWCNT(n,m)s different diameter ((n,m) = (6,5) and (7,6)) free-base or zinc porphyrin bearing peripheral positive charges ((TMPyP+)M (tetrakis(4-N-methylpyridyl)porphyrin); M Zn H2) serving as light-absorbing photoactive materials are utilized. The...

High oxidation potential perfluorinated zinc phthalocyanines (ZnF(n)Pcs) are synthesised and their spectroscopic, redox, light-induced electron-transfer properties investigated systematically by forming donor-acceptor dyads through metal-ligand axial coordination of fullerene (C60) derivatives. Absorption fluorescence spectral studies reveal efficient binding the pyridine- (Py) phenylimidazole-functionalised (C60Im) derivatives to centre F(n)Pcs. The determined constants, K, in...

<div class="section abstract"><div class="htmlview paragraph">Deliberate modifications to infrastructure can significantly enhance machine vision recognition of road sections designed for Vulnerable Road Users, such as green bike lanes. This study evaluates how lanes, compared unpainted and vulnerable users safety by keeping vehicles at a safe distance preventing encroachment into designated Conducted the American Center Mobility, this utilizes vehicle equipped with front-facing...

Abstract A non‐covalent double‐decker binding strategy is employed to construct functional supramolecular single‐wall carbon nanotubes (SWCNT)–tetrapyrrole hybrids capable of undergoing photoinduced electron transfer and performing direct conversion light into electricity. To accomplish this, two semiconducting SWCNTs different diameters (6,5 7,6) were modified via π–π stacking pyrene functionalized with an alkyl ammonium cation (PyrNH 3 + ). Such subsequently assembled dipole–cation zinc...

Supramolecular donor–acceptor hybrids composed of few-layer graphene as an electron acceptor and phthalocyanine or porphyrin bearing four pyrene entities photosensitizer donors have been synthesized, occurrence ultrafast charge separation in the order 1011–1012 s−1 due to close proximity donor is demonstrated.

Graphene oxide decorated with an electron donor, zinc(II) phthalocyanine, and acceptor, fullerene, has been synthesized, photoinduced transfer leading to charge-separation is reported.

Doubly-resonant sum frequency generation (DR-SFG) spectra of fullerene thin films on metallic and dielectric substrates show modal substrate selectivity.

Photoinduced electron transfer in self-assembled via ion-pairing porphyrin–SWCNT nanohybrids has been reported. To accomplish this, two kinds of semiconducting SWCNTs different diameters, and free-base or zinc porphyrin bearing peripheral positive negative charges serving as light absorbing photo-active materials are utilized. The donor–acceptor hybrids held by with the help oppositely charged pyrene derivatives adhered to side walls SWCNTs. Higher charge-separation efficiency is established...

The molecular self-assembly of surfactants on the surface single-walled carbon nanotubes (SWCNT) is currently a common strategy for tuning nanotube properties and stabilization dispersions. Here, we report direct measurements degree interfacial ordering sodium dodecyl sulfate (SDS) adsorbed colloidal, single-chirality enriched, SWCNTs within solid film investigate dependence alkyl chain order surfactant concentration in precursor solution. SWCNT-bound SDS molecules, probed by vibrational sum...

Photoexcited electron injection and back transfer dynamics of metal tetrapyrrole bound to TiO2 nanoparticle surfaces via the metal–ligand axial coordination approach have been investigated using femtosecond pump–probe transient spectroscopic technique. The employed tetrapyrroles include zinc magnesium metalated meso-tetraarylporphyrins having halogen substituents on peripheral aryl groups, perfluorinated phthalocyanine derivatives, naphthalocyanine. covered absorption at different portions...

Abstract Covalent functionalization of diameter sorted SWCNTs with porphyrins (MP), and photochemistry to establish nanotube diameter‐dependent charge separation efficiencies are reported. The MP–SWCNT( n , m ) [M=2 H or Zn, ( )=(7,6) (6,5)] nanohybrids characterized by a variety spectroscopic, thermogravimetric, TEM imaging techniques, also DFT MO calculations. Raman fluorescence studies reveal the presence moderate number on SWCNT surface. results suggest (CS) via excited state MP....

Abstract Zinc‐ion capacitors (ZICs) are promising next‐generation energy storage systems (ESS) owing to high safety, material abundance, environmental friendliness, and low cost; however, the density of ZICs must be improved compete with lithium‐ion batteries (LIBs). Here, study implements three strategies enhance electrochemical performance manage dendritic growth on Zn anodes, including crafting a highly efficient redox electroactive niobium pyrophosphate (NbP 2 O 7 )/Ti 3 C T X ‐MXene...

Photoinduced electron transfer processes in self-assembled zinc porphyrin ( ZnP ) or phthalocyanine ZnPc with semiconducting (7,6)- and (6,5)-enriched SWCNTs were investigated. To bind photosensitizers to SWCNTs, first, pyrene covalently functionalized a phenylimidazole (Im-Pyr) entity was treated SWCNTs. Exfoliation of occurred due π–π stacking nanotubes walls leaving the imidazole that subsequently used coordinate o-dichlorobenzene (DCB). The donor-acceptor nanohybrids thus formed...

The superoxide anion radical, O2•−, induced C60 electropolymerization mechanism was refined by simultaneous cyclic voltammetric (CV) and vis-NIR spectroelectrochemical as well mass spectrometric (MALDI-TOF) characterization of the one- two-electron reduction products in presence O2 a mixed organic solvent solution. polymer (C60-O) film also investigated Raman spectroscopy imaged atomic force microscopy (AFM) both at early advanced polymerization stage. While behavior C60/C60•− couple similar...

Photoinduced charge separation processes of three-layer supramolecular hybrids, fullerene-porphyrin-SWCNT, which are constructed from semiconducting (7,6)- and (6,5)-enriched SWCNTs self-assembled via π-π interacting long alkyl chain substituted porphyrins (tetrakis(4-dodecyloxyphenyl)porphyrins; abbreviated as MP(alkyl)(4)) (M = Zn H(2)), to imidazole functionalized fullerene[60] (C(60)Im) is coordinated, have been investigated in organic solvents. The intermolecular alkyl-π interactions...


 Friction sensitivity of composite propellants and their ingredients is significant interest to mitigate the risk associated with accidental initiation while processing, handling, transportation. In this work, attempts were made examine friction passive binder: Hydroxy Terminated Polybutadiene/Aluminium/Ammonium Perchlorate active (Polymer + Nitrate Esters)/Ammonium Perchlorate/Aluminium/Nitramine based by using BAM Apparatus. As per recommendation NATO standard STANAG–4487, was...

A (carbon nanotube)–(fullerene–ferrocene dyad polymer) composite, pyr-SWCNTs/(C60Fc-Pd), was devised and tested as an active material of a symmetrical device for electric energy storage. The composite redox conducting at both positive negative potentials due to the Fc/Fc+ C60–/C60 electrode process ferrocene fullerene moiety dyad, respectively. prepared, first, by electrophoretic deposition film noncovalently modified with 1-pyrenebutyric acid stacked single-wall carbon nanotubes...