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in vivo polydopamine coating of Rhodobacter sphaeroides for enhanced electron transfer

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Nano Research 2024年第2期17卷 875-881页

作者： Rossella Labarile Danilo Vona Maria Varsalona Matteo Grattieri Melania Reggente Roberto Comparelli Gianluca M.Farinola Fabian Fischer Ardemis A.Boghossian Massimo Trotta istituto per i processi chimico fisici Consiglio Nazionale delle RicercheBari 70126Italy Dipartimento di Chimica Universitàdegli Studi di BariBari 70126Italy institute of Chemical Sciences and Engineering(iSiC) Ecole Polytechnique Fédérale de Lausanne(EPFL)Lausanne 1015Switzerland institute of Life Technologies HES-SO Valais-Wallis1950 SionSwitzerland institute for Renewable Energy HES-SO Valais-Wallis1950 SionSwitzerland

Recent advances in coupling light-harvesting microorganisms with electronic components have led to a new generation of biohybrid devices based on microbial photocatalysts.These devices are limited by the poorly conductive interface between phototrophs and synthetic materials that inhibit charge transfer.This study focuses on overcoming this bottleneck through the metabolically-driven encapsulation of photosynthetic cells with a bio-inspired conductive polymer.Cells of the purple non sulfur bacterium Rhodobacter sphaeroides were coated with a polydopamine(PDA)nanoparticle layer via the self-polymerization of dopamine under anaerobic conditions.The treated cells show preserved light absorption of the photosynthetic pigments in the presence of dopamine concentrations ranging between 0.05–3.5 mM.The thickness and nanoparticle formation of the membrane-associated PDA matrix were further shown to vary with the dopamine concentrations in this range.Compared to uncoated cells,the encapsulated cells show up to a 20-fold enhancement in transient photocurrent measurements under mediatorless conditions.The biologically synthesized PDA can thus act as a matrix for electronically coupling the light-harvesting metabolisms of cells with conductive surfaces.

关键词： bioelectronics photosynthetic bacteria purple bacteria electron transfer polydopamine biophotovoltaics

Polydopamine-coated photoautotrophic bacteria for improving extracellular electron transfer in living photovoltaics

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Nano Research 2024年第2期17卷 866-874页

作者： Melania Reggente Charlotte Roullier Mohammed Mouhib Patricia Brandl Hanxuan Wang Stefano Tacconi Francesco Mura Luciana Dini Rossella Labarile Massimo Trotta Fabian Fischer Ardemis A.Boghossian institute of Chemical Sciences and Engineering(iSiC) Ecole Polytechnique Fédérale de Lausanne(EPFL)Lausanne 1015Switzerland Department of Biology and Biotechnology Charles Darwin Sapienza University of RomeRome 00185Italy Research Center on Nanotechnology Applied for Engineering of Sapienza(CNiS) University of Rome SapienzaRome 00185Italy cnr-iPCF Consiglio Nazionale delle Ricerche–istituto per i processi chimico fisici Bari 70126Italy institute of Life Technologies HES-SO Valais-WallisSion 1950Switzerland institute for Renewable Energy HES-SO Valais-WallisSion 1950Switzerland

Living photovoltaics are microbial electrochemical devices that use whole cell–electrode interactions to convert solar energy to electricity.The bottleneck in these technologies is the limited electron transfer between the microbe and the electrode surface.This study focuses on enhancing this transfer by engineering a polydopamine(PDA)coating on the outer membrane of the photosynthetic microbe Synechocystis sp.PCC6803.This coating provides a conductive nanoparticle shell to increase electrode adhesion and improve microbial charge extraction.A combination of scanning electron microscopy(SEM),transmission electron microscopy(TEM),UV–Vis absorption,and Raman spectroscopy measurements were used to characterize the nanoparticle shell under various synthesis conditions.The cell viability and activity were further assessed through oxygen evolution,growth curve,and confocal fluorescence microscopy measurements.The results show sustained cell growth and detectable PDA surface coverage under slightly alkaline conditions(pH 7.5)and at low initial dopamine(DA)concentrations(1 mM).The exoelectrogenicity of the cells prepared under these conditions was also characterized through cyclic voltammetry(CV)and chronoamperometry(CA).The measurements show a three-fold enhancement in the photocurrent at an applied bias of 0.3 V(vs.Ag/AgCl[3 M KCl])compared to non-coated cells.This study thus lays the framework for engineering the next generation of living photovoltaics with improved performances using biosynthetic electrodes.

关键词： biophotovoltaics bioelectronics photosynthetic bacteria cyanobacteria polydopamine adherence

Coupling effects in QD dimers at sub-nanometer interparticle distance

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Nano Research 2020年第4期13卷 1071-1080页

作者： Carlo Nazareno Dibenedetto Elisabetta Fanizza Rosaria Brescia Yuval Kolodny Sergei Remennik Annamaria Panniello Nicoletta Depalo Shira Yochelis Roberto Comparelli Angela Agostiano Maria Lucia Curri Yossi Paltiel Marinella Striccoli cnr-istituto per i processi chimico-fisici SS bari Via Orabona 470125-BariItaly Dipartimento di Chimica Universita degli Studi di Bari Aldo MoroVia Orabona 470125-BariItaly Electron Microscopy Facility Istituto Italiano di Tecnologiavia Morego 3016163 GenovaItaly Department of Applied Physics and the Center for Nanoscience and Nanotechnology Hebrew University of JerusalemJerusalem 9190401Israel

Currently,intensive research efforts focus on the fabrication of meso-structures of assembled colloidal quantum dots(QDs)with original optical and electronic properties.Such collective features originate from the QDs coupling,depending on the number of connected units and their distance.However,the development of general methodologies to assemble colloidal QD with precise stoichiometry and particle-particle spacing remains a key challenge.Here,we demonstrate that dimers of CdSe QDs,stable in solution,can be obtained by engineering QD surface chemistry,reducing the surface steric hindrance and favoring the link between two QDs.The connection is made by using alkyl dithiols as bifunctional linkers and different chain lengths are used to tune the interparticle distance from few nm down to 0.5 nm.The spectroscopic investigation highlights that coupling phenomena between the QDs in dimers are strongly dependent on the interparticle distance and QD size,ultimately affecting the exciton dissociation efficiency.

关键词： quantum dots dimers surface chemistry dithiols coupling

integrin-targeting with peptide-bioconjugated semiconductor-magnetic nanocrystalline heterostructures

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Nano Research 2016年第3期9卷 644-662页

作者： Gianpiero Valente Nicoletta Depalo ivan de Paola Rosa Maria lacobazzi Nunzio Denora Valentino Laquintana Roberto Comparelli Emiliano Altamura Tiziana Latronico Michele Altomare Elisabetta Fanizza Marinella Striccoli Angela Agostiano Michele Saviano Annarita Del Gatto Laura Zaccaro Maria Lucia Curri Universita degli Studi di bari Aldo Moro Dipartimento di Chimica Via Orabona 4 70125 - Bari Italy istituto per i processi chimico-fisici-cnr uos bari Via Orabona 4 70125 - Bari Italy istituto di Biostrutture e Bioimmagini-cnr Via Mezzocannone 16 80134 - Napoli Italy Universita degli Studi di bari Aldo Moro Dipartimento di Farmacia - Scienze del Farmaco Via Orabona 4 70125 - Bari Italy Universita degli Studi di bariAido Moro Dipartimento di Bioscienze Biotecnologie e Biofarmaceutica Via Orabona 4 70125 - Bari Italy lstituto di Cristallografia-cnr Via Amendola 122/0 70126 Bari Italy

Binary asymmetric nanocrystals （BNCs）, composed of a photoactive TiO2 nanorod joined with a superparamagnetic γ-Fe203 spherical domain, were embedded in polyethylene glycol modified phospholipid micelle and successfully bioconjugated to a suitably designed peptide containing an RGD motif. BNCs represent a relevant multifunctional nanomaterial, owing to the coexistence of two distinct domains in one particle, characterized by high photoactivity and magnetic properties, that is particularly suited for use as a phototherapy and hyperthermia agent as well as a magnetic probe in biological imaging. We selected the RGD motif in order to target integrin expressed on activated endothelial cells and several types of cancer cells. The prepared RGD-peptide/BNC conjugates, comprehensively monitored by using complementary optical and structural techniques, demon- strated a high stability and uniform dispersibility in biological media. The cytotoxicity of the RGD-peptide/BNC conjugates was studied in vitro. The cellular uptake of RGD-peptide conjugates in the cells, assessed by means of two distinct approaches, namely confocal microscopy analysis and emission spectroscopy determination in cell lysates, displayed selectivity of the RGD-peptide-BNC conjugate for the cw]33 integrin. These RGD-peptide-BNC conjugates have a high potential for theranostic treatment of cancer.

关键词： nanocrystallineheterostructures,photoactive semiconductor,magnetic nanostructure,cyclic RGD peptide,αvβ3 integrin,active targeting

Sorafenib delivery nanoplatform based on superpara- magnetic iron oxide nanoparticles magnetically targets hepatocellular carcinoma

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Nano Research 2017年第7期10卷 2431-2448页

作者： Nicoletta Depalo Rosa Maria lacobazzi Gianpiero Valente ilaria Arduino Silvia Villa Fabio Canepa Valentino Laquintana Elisabetta Fanizza Marinella Striccoli Annalisa Cutrignelli Angela Lopedota Letizia Porcelli Amalia Azzariti Massimo Franco Maria Lucia Curri Nunzio Denora istituto per i processi chimico-fisici-cnr uos bari Via Orabona 4 70125 Bari Italy istituto Tumori iRCCS Giovanni Paolo ii viale O. Flacco 65 70124 Bari Italy Dipartimento di Chimica Universita degli Studi di Bad Aldo Moro Via Orabona70125 Bari Italy Dipartimento di Farmacia-Scienze del Farmaco Universita degli Studi di Bari Aldo Moro Via Orabona 4 70125 Bari Italy Dipartimento di Chimica e Chimica industriale Universita di Genova Via Dodecaneso 31 16146 Genova Italy

Currently, sorafenib is the only systemic therapy capable of increasing overall survival of hepatocellular carcinoma patients. Unfortunately, its side effects, particularly its overall toxicity, limit the therapeutic response that can be achieved. Superparamagnetic iron oxide nanoparticles （SPiONs） are very attractive for drug delivery because they can be targeted to specific sites in the body through application of a magnetic field, thus improving intratumoral accumulation and reducing adverse effects. Here, nanoformulations based on polyethylene glycol modified phospholipid micelles, loaded with both SPiONs and sorafenib, were successfully prepared and thoroughly investigated by complementary techniques. This nanovector system provided effective drug delivery, had an average hydrodynamic diameter of about 125 nm, had good stability in aqueous medium, and allowed controlled drug loading. Magnetic analysis allowed accurate determination of the amount of SPiONs embedded in each micelle. An in vitro system was designed to test whether the SPiON micelles can be efficiently held using a magnetic field under typical flow conditions found in the human liver. Human hepatocellular carcinoma （HepG2） cells were selected as an in vitro system to evaluate tumor cell targeting efficacy of the superparamagnetic micelles loaded with sorafenib. These experiments demonstrated that this delivery platform is able to enhance sorafenib＇s antitumor effectiveness by magnetic targeting. The magnetic nanovectors described here represent promising candidates for targeting specific hepatic tumor sites, where selective release of sorafenib can improve its efficacy and safety profile.

关键词： superparamagnetic ironoxide nanoparticles,poly（ethylene glycol）（PEG）-modified phospholipidmicelles,drug delivery,magnetic targeting,hepatocellular carcinoma,sorafenib

Post-synthesis phase and shape evolution of CsPbBr3 colloidal nanocrystals: The role of ligands

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Nano Research 2019年第5期12卷 1155-1166页

作者： Elisabetta Fanizza Francesca Cascella Davide Altamura Cinzia Giannini Annamaria Panniello Leonardo Triggiani Francesca Panzarea Nicoletta Depalo Roberto Grisorio Gian Paolo Suranna Angela Agostiano M.Lucia Curri Marinella Striccoli Dipartimento di Chimica Università degli Studi di Bari "A.Moro"Via Orabona 470126 BariItaly cnr-istituto per i processi chimico fisici S.S.BariVia Orabona470126 BariItaly cnr-istituto di Cristallografia Via Amendola122/O70126 BariItaly yDipartimento di ingegneria Civile Ambientaledel TerritorioEdile e di Chimica(DICATECh)Politecnico di BariVia Orabona 470125Italy cnr-NANOTEC-istituto di Nanotecnologia Via Monteroni 73100 LecceItaly

The surface chemistry of colloidal cesium lead bromide (CsPbBr3) nanocrystals is decisive in determining the stability and the final morphology of this class of materials,characterized by ionic structure and a high defect tolerance factor.Here,the high sensitivity of purified colloidal nanocubes of CsPbBr3 to diverse environmental condition (solvent dilution,ageing,ligands post synthetic treatment) in ambient atmosphere is investigated by means of a comprehensive morphological (electron microscopy),structural (θ/2θ X-ray diffraction (XRD) and grazing incidence wide angle scattering (GiWAXS)),and spectroscopic chemical (1H nuclear magnetic resonance (NMR),nuclear Overhauser effect spectroscopy (NOESY),absorption and emission spectroscopy) characterization.The aging and solvent dilution contribute to modify the nanocrystal morphology,due to a modification of the ligand dynamic.Moreover,we establish the ability of aliphatic carboxylic acids and aikyl amines ligands to induce,even in a post preparative process at room temperature,structural,morphological and spectroscopic variations.Upon post synthesis alkyl amine addition,in particular of oleyl amine and octyl amine,the highly green emitting CsPbBr3 nanocubes effectively tum into one-dimensional (1 D) thin tetragonal nanowires or lead halide deficient rhombohedral zero-dimensional (0D) Cs4PbBr6 structures with a complete loss of fluorescence.The addition of an alkyl carboxylic acid,as oleic and nonanoic acid,produces the transformation of nanocubes into still emitting orthorombic two-dimensional (2D) nanoplates.The acid/base equilibrium between the native and added ligands,the edsorbed/free ligands dynamic in solution and the ligand solubility in non-polar solvent contribute to render CsPbBr3 particularly sensitive to environmental and processing conditions and,therefore prone to undergo to structural,morphological and,hence spectroscopic,transformations.

关键词： lead halide perovskite nanocrystals surface chemistry ligands equilibria long term stability

Kinetic Density Functional Theory: A Microscopic Approach to Fluid Mechanics

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Communications in Theoretical Physics 2014年第10期61卷 596-606页

作者： Umberto Marini Bettolo Marconi Simone Melchionna Scuola di Scienze e Tecnologie Università di CamerinoVia Madonna delle Carceri62032CamerinoINFN PerugiaItaly istituto processi chimico-fisici Consiglio Nazionale delle RicercheItaly

in the present paper we give a brief summary of some recent theoretical advances in the treatment of inhomogeneous fluids and methods which have applications in the study of dynamical properties of liquids in situations of extreme confinement, such as nanopores, nanodevices, etc. The approach obtained by combining kinetic and density functional methods is microscopic, fully self-consistent and allows to determine both configurational and flow properties of dense fluids. The theory predicts the correct hydrodynamic behavior and provides a practical and numerical tool to determine how the transport properties are modified when the length scales of the confining channels are comparable with the size of the molecules. The applications range from the dynamics of simple fluids under confinement, to that of neutral binary mixtures and electrolytes where the theory in the limit of slow gradients reproduces the known phenomenological equations such as the Planck–Nernst–Poisson and the Smolochowski equations. The approach here illustrated allows for fast numerical solution of the evolution equations for the one-particle phase-space distributions by means of the weighted density lattice Boltzmann method and is particularly useful when one considers flows in complex geometries.

关键词： Kinetic theory dynamical density functional theory electrokinetics

Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array

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Light(Science & Applications) 2016年第1期5卷 855-861页

作者： Barbara Fazio Pietro Artoni Maria Antonia iatì Cristiano D’Andrea Maria JosèLo Faro Salvatore Del Sorbo Stefano Pirotta Pietro Giuseppe Gucciardi Paolo Musumeci Cirino Salvatore Vasi Rosalba Saija Matteo Galli Francesco Priolo Alessia irrera cnr-iPCF Istituto per i Processi Chimico Fisici98158 MessinaItaly Dipartimento di Fisica e Astronomia Universitàdi Catania95123 CataniaItaly cnr-MATiS iMM Istituto per la Microelettronica e Microsistemi95123 CataniaItaly Dipartimento di Fisica Universitàdegli Studi di Pavia27100 PaviaItaly Dipartimento di Scienze Matematiche e informatiche Scienze Fisiche e Scienze della TerraUniversitàdi Messina98166 MessinaItaly Scuola Superiore di Catania Universitàdi Cataniavia Valdisavoia995123 CataniaItaly

We report on the unconventional optical properties exhibited by a two-dimensional array of thin Si nanowires arranged in a random fractal geometry and fabricated using an inexpensive,fast and maskless process compatible with Si technology.The structure allows for a high light-trapping efficiency across the entire visible range,attaining total reflectance values as low as 0.1%when the wavelength in the medium matches the length scale of maximum heterogeneity in the system.We show that the random fractal structure of our nanowire array is responsible for a strong in-plane multiple scattering,which is related to the material refractive index fluctuations and leads to a greatly enhanced Raman scattering and a bright photoluminescence.These strong emissions are correlated on all length scales according to the refractive index fluctuations.The relevance and the perspectives of the reported results are discussed as promising for Si-based photovoltaic and photonic applications.

关键词： light trapping multiple scattering Raman enhancement random fractal silicon nanowires

Parallel Molecular Dynamics with irregular Domain Decomposition

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Communications in Computational Physics 2011年第9期10卷 1071-1088页

作者： Mauro Bisson Massimo Bernaschi Simone Melchionna Department of Computer Science University of Rome"Sapienza"Italy istituto Applicazioni Calcolo Consiglio Nazionale delle RicercheRomeItaly institute of Material Sciences and Engineering ´Ecole Polytechnique F´ed´erale de LausanneSwitzerland cnr-iPCF Istituto Processi Chimico-FisiciConsiglio Nazionale delle RicercheRomeItaly

The spatial domain of Molecular Dynamics simulations is usually a regular box that can be easily divided in subdomains for parallel processing.Recent efforts aimed at simulating complex biological systems,like the blood flow inside arteries,require the execution of Parallel Molecular Dynamics(PMD)in vessels that have,by nature,an irregular shape.in those cases,the geometry of the domain becomes an additional input parameter that directly influences the outcome of the simulation.in this paper we discuss the problems due to the parallelization of MD in complex geometries and show an efficient and general method to perform MD in irregular domains.

关键词： Molecular dynamics irregular domain decomposition parallel algorithms hemodynamics