Haim Weissman

artykuł

Highly Conductive Robust Carbon Nanotube Networks for Strong Buckypapers and Transparent Electrodes

Lior Snarski, Idan Biran, Tatyana Bendikov, Iddo Pinkas, więcej

Advanced Functional Materials > 34 > 7 > n/a - n/a

While individual single‐wall carbon nanotubes (SWCNTs) have remarkable strength and electrical conductivity, SWCNT networks fabricated from dispersions have inferior properties due to nanotube bundling, limiting the potential applications of SWCNT materials. Herein, a common dye molecule (purpurin) is used to exfoliate SWCNTs via noncovalent functionalization and to fabricate SWCNT materials by a...

artykuł

Real‐Space Crystal Structure Analysis by Low‐Dose Focal‐Series TEM Imaging of Organic Materials with Near‐Atomic Resolution

Idan Biran, Lothar Houben, Haim Weissman, Mariana Hildebrand, więcej

Advanced Materials > 34 > 26 > n/a - n/a

Structural analysis of beam‐sensitive materials by transmission electron microscopy (TEM) represents a significant challenge, as high‐resolution TEM (HRTEM) requires high electron doses that limit its applicability to stable inorganic materials. Beam‐sensitive materials, e.g., organic crystals, must be imaged under low dose conditions, leading to problematic contrast interpretation and loss of fine...

artykuł

Foliar Delivery of siRNA Particles for Treating Viral Infections in Agricultural Grapevines

Aviram Avital, Noy Sadot Muzika, Zohar Persky, Gili Bar, więcej

Advanced Functional Materials > 31 > 44 > n/a - n/a

Grapevine leafroll disease (GLD) is a globally spreading viral infection that causes major economic losses by reducing crop yield, plant longevity, and berry quality, with no effective treatment. Grapevine leafroll associated virus‐3 (GLRaV‐3) is the most severe, prevalent GLD strain affecting wine production. Here, the ability of RNA interference (RNAi), a non‐GMO gene‐silencing pathway, to treat...

artykuł

Crystals of Benzamide, the First Polymorphous Molecular Compound, Are Helicoidal

Alexander G. Shtukenberg, Ran Drori, Elena V. Sturm, Netta Vidavsky, więcej

Angewandte Chemie > 132 > 34 > 14701 - 14709

The growth of spontaneously twisted crystals is a common but poorly understood phenomenon. An analysis of the formation of twisted crystals of a metastable benzamide polymorph (form II) crystallizing from highly supersaturated aqueous and ethanol solutions is given here. Benzamide, the first polymorphic molecular crystal reported (1832), would have been the first helicoidal crystal observed had the...

artykuł

Crystals of Benzamide, the First Polymorphous Molecular Compound, Are Helicoidal

Alexander G. Shtukenberg, Ran Drori, Elena V. Sturm, Netta Vidavsky, więcej

Angewandte Chemie International Edition > 59 > 34 > 14593 - 14601

The growth of spontaneously twisted crystals is a common but poorly understood phenomenon. An analysis of the formation of twisted crystals of a metastable benzamide polymorph (form II) crystallizing from highly supersaturated aqueous and ethanol solutions is given here. Benzamide, the first polymorphic molecular crystal reported (1832), would have been the first helicoidal crystal observed had the...

artykuł

Crystallization of Small Organic Molecules in a Polymer Matrix: Multistep Mechanism Enables Structural Control

Ilya Bronshtein, Haim Weissman, Ifat Kaplan‐Ashiri, Boris Rybtchinski

Small > 15 > 38 > n/a - n/a

The widely employed crystallization of organic molecules in solution is not well understood and is difficult to control. Employing polymers as crystallization media may allow enhanced control via temperature‐induced regulation of polymer dynamics. Crystallization of a small organic molecule (perylene diimide) is investigated in polymer matrices (polystyrene) that enable the mechanistic study and control...

artykuł

Composites of hydrophilic polymers and organic nanocrystals enable enhanced robustness

Sounak Dutta, XiaoMeng Sui, Haim Weissman, Vyacheslav Kalchenko, więcej

Polymers for Advanced Technologies > 30 > 10 > 2549 - 2557

We describe a new family of composite materials, polymer/organic nanocrystal (ONC) hybrids. These were prepared from soluble ONCs based on perylene diimides (PDI) and water‐soluble polymers (sodium alginate and polyvinyl alcohol). Polymer/ONC films were characterized by optical spectroscopy, electron microscopy, and tensile strength studies. The films show enhanced chemical and mechanical stability...

artykuł

Hydrophobicity Control in Adaptive Crystalline Assemblies

Erez Cohen, Yahel Soffer, Haim Weissman, Tatyana Bendikov, więcej

Angewandte Chemie > 130 > 29 > 9009 - 9012

An amphiphile based on polyethylene glycol (PEG) polymer and two molecular moieties (perylene diimide and C₇ fluoroalkyl, PDI and C₇F) attached to its termini assembles into crystalline films with long‐range order. The films reversibly switch from crystalline to amorphous above the PEG melting temperature. The adaptive behavior stems from the responsiveness of the PEG domain and the robustness of...

artykuł

Hydrophobicity Control in Adaptive Crystalline Assemblies

Erez Cohen, Yahel Soffer, Haim Weissman, Tatyana Bendikov, więcej

Angewandte Chemie International Edition > 57 > 29 > 8871 - 8874

An amphiphile based on polyethylene glycol (PEG) polymer and two molecular moieties (perylene diimide and C₇ fluoroalkyl, PDI and C₇F) attached to its termini assembles into crystalline films with long‐range order. The films reversibly switch from crystalline to amorphous above the PEG melting temperature. The adaptive behavior stems from the responsiveness of the PEG domain and the robustness of...

artykuł

The Kinetics of Growth of Metallo‐supramolecular Polyelectrolytes in Solution

Stefanie Martina Munzert, Simon P. Stier, Guntram Schwarz, Haim Weissman, więcej

Chemistry – A European Journal > 24 > 12 > 2898 - 2912

Several transition metal ions, like Fe²⁺, Co²⁺, Ni²⁺, and Zn²⁺ complex to the ditopic ligand 1,4‐bis(2,2′:6′,2′′‐terpyridin‐4′‐yl)benzene (L). Due to the high association constant, metal‐ion induced self‐assembly of Fe²⁺, Co²⁺, and Ni²⁺ leads to extended, rigid‐rod like metallo‐supramolecular coordination polyelectrolytes (MEPEs) even in aqueous solution. Here, we present the kinetics of growth of...

artykuł

Self‐Assembled Hybrid Materials Based on Organic Nanocrystals and Carbon Nanotubes

Angelica Niazov‐Elkan, Haim Weissman, Sounak Dutta, Sidney R. Cohen, więcej

Advanced Materials > 30 > 2 > n/a - n/a

Organic crystalline materials are used as dyes/pigments, pharmaceuticals, and active components of photonic and electronic devices. There is great interest in integrating organic crystals with inorganic and carbon nanomaterials to create nanocomposites with enhanced properties. Such efforts are hampered by the difficulties in interfacing organic crystals with dissimilar materials. Here, an approach...

artykuł

Self‐Assembly of Perylenediimide–Single‐Strand‐DNA Conjugates: Employing Hydrophobic Interactions and DNA Base‐Pairing To Create a Diverse Structural Space

Ashutosh Kumar Mishra, Haim Weissman, Elisha Krieg, Kevin A. Votaw, więcej

Chemistry – A European Journal > 23 > 43 > 10328 - 10337

The self‐assembly behavior of DNA conjugates possessing a perylenediimide (PDI) head group and an N‐oligonucleotide tail has been investigated using a combination of optical spectroscopy and cryogenic transmission electron microscopy (cryo‐TEM) imaging. To obtain insight into the interplay between PDI hydrophobic interactions and DNA base‐pairing we employed systematic variation in the length and...

artykuł

Robuste “Aqua‐Materialien”: eine druckstabile, selbstorganisierte Membran zur Wasserreinigung

Erez Cohen, Haim Weissman, Eyal Shimoni, Ifat Kaplan‐Ashiri, więcej

Angewandte Chemie > 129 > 8 > 2237 - 2242

“Aqua‐Materialien”, die so stabil sind wie herkömmliche Kunststoffe und dabei überwiegend aus Wasser bestehen, sind eine sehr attraktive Materialklasse, jedoch wurde die Widerstandsfähigkeit dieser Materialien gegenüber rauen Bedingungen, z. B. hohen Drücken bei industriellen Anwendungen, bisher nicht nachgewiesen. Eine Hydrogel‐artige Membran, hergestellt durch Selbstorganisation aus einem aromatischen...

artykuł

Robust Aqua Material: A Pressure‐Resistant Self‐Assembled Membrane for Water Purification

Erez Cohen, Haim Weissman, Eyal Shimoni, Ifat Kaplan‐Ashiri, więcej

Angewandte Chemie International Edition > 56 > 8 > 2203 - 2207

“Aqua materials” that contain water as their major component and are as robust as conventional plastics are highly desirable. Yet, the ability of such systems to withstand harsh conditions, for example, high pressures typical of industrial applications has not been demonstrated. We show that a hydrogel‐like membrane self‐assembled from an aromatic amphiphile and colloidal Nafion is capable of purifying...

artykuł

Precrystalline Aggregates Enable Control over Organic Crystallization in Solution

Chen Shahar, Sounak Dutta, Haim Weissman, Linda J. W. Shimon, więcej

Angewandte Chemie International Edition > 55 > 1 > 179 - 182

Understanding and controlling organic crystallization in solution is a long‐standing challenge. Herein, we show that crystallization of an aromatic amphiphile based on perylene diimide in aqueous media involves initially formed amorphous spherical aggregates that evolve into the crystalline phase. The initial appearance of the crystalline order is always confined to the spherical aggregates that are...

artykuł

Precrystalline Aggregates Enable Control over Organic Crystallization in Solution

Chen Shahar, Sounak Dutta, Haim Weissman, Linda J. W. Shimon, więcej

Angewandte Chemie > 128 > 1 > 187 - 190

Understanding and controlling organic crystallization in solution is a long‐standing challenge. Herein, we show that crystallization of an aromatic amphiphile based on perylene diimide in aqueous media involves initially formed amorphous spherical aggregates that evolve into the crystalline phase. The initial appearance of the crystalline order is always confined to the spherical aggregates that are...

artykuł

Innenrücktitelbild: Designed Enclosure Enables Guest Binding Within the 4200 Å³ Cavity of a Self‐Assembled Cube (Angew. Chem. 19/2015)

William J. Ramsay, Filip T. Szczypiński, Haim Weissman, Tanya K. Ronson, więcej

Angewandte Chemie > 127 > 19 > 5887 - 5887

Die Entwicklung großer Metall‐organischer Wirte, deren Hohlraum genügend von der Lösungsmittelumgebung abgegrenzt ist, um die Bindung von Gastmolekülen zu ermöglichen, ist eine Herausforderung. In der Zuschrift auf S. 5728 ff. berichten J. R. Nitschke et al. über eine rationale Strategie, die es ermöglicht, die Größe eines selbstorganisierten Würfels zu steigern und dabei den Hohlraum für die Bindung...

artykuł

Designed Enclosure Enables Guest Binding Within the 4200 Å³ Cavity of a Self‐Assembled Cube

William J. Ramsay, Filip T. Szczypiński, Haim Weissman, Tanya K. Ronson, więcej

Angewandte Chemie > 127 > 19 > 5728 - 5732

Metal–organic self‐assembly has proven to be of great use in constructing structures of increasing size and intricacy, but the largest assemblies lack the functions associated with the ability to bind guests. Here we demonstrate the self‐assembly of two simple organic molecules with Cd^II and Pt^II into a giant heterometallic supramolecular cube which is capable of binding a variety of mono‐ and dianionic...

artykuł

Inside Back Cover: Designed Enclosure Enables Guest Binding Within the 4200 Å³ Cavity of a Self‐Assembled Cube (Angew. Chem. Int. Ed. 19/2015)

William J. Ramsay, Filip T. Szczypiński, Haim Weissman, Tanya K. Ronson, więcej

Angewandte Chemie International Edition > 54 > 19 > 5793 - 5793

Designing large metal–organic hosts whose cavities are sufficiently differentiated from the solvent environment to enable guest binding is a challenge. In their Communication on page 5636 ff., J. R. Nitschke et al. report a rational strategy that allows the size of a self‐assembled cube to be increased whilst maintaining an enclosed cavity capable of binding a variety of mono‐ and dianionic guests...

artykuł

Designed Enclosure Enables Guest Binding Within the 4200 Å³ Cavity of a Self‐Assembled Cube

William J. Ramsay, Filip T. Szczypiński, Haim Weissman, Tanya K. Ronson, więcej

Angewandte Chemie International Edition > 54 > 19 > 5636 - 5640

Metal–organic self‐assembly has proven to be of great use in constructing structures of increasing size and intricacy, but the largest assemblies lack the functions associated with the ability to bind guests. Here we demonstrate the self‐assembly of two simple organic molecules with Cd^II and Pt^II into a giant heterometallic supramolecular cube which is capable of binding a variety of mono‐ and dianionic...

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Wyniki wyszukiwania dla: Haim Weissman

Highly Conductive Robust Carbon Nanotube Networks for Strong Buckypapers and Transparent Electrodes

Real‐Space Crystal Structure Analysis by Low‐Dose Focal‐Series TEM Imaging of Organic Materials with Near‐Atomic Resolution

Foliar Delivery of siRNA Particles for Treating Viral Infections in Agricultural Grapevines

Crystals of Benzamide, the First Polymorphous Molecular Compound, Are Helicoidal

Crystals of Benzamide, the First Polymorphous Molecular Compound, Are Helicoidal

Crystallization of Small Organic Molecules in a Polymer Matrix: Multistep Mechanism Enables Structural Control

Composites of hydrophilic polymers and organic nanocrystals enable enhanced robustness

Hydrophobicity Control in Adaptive Crystalline Assemblies

Hydrophobicity Control in Adaptive Crystalline Assemblies

The Kinetics of Growth of Metallo‐supramolecular Polyelectrolytes in Solution

Self‐Assembled Hybrid Materials Based on Organic Nanocrystals and Carbon Nanotubes

Self‐Assembly of Perylenediimide–Single‐Strand‐DNA Conjugates: Employing Hydrophobic Interactions and DNA Base‐Pairing To Create a Diverse Structural Space

Robuste “Aqua‐Materialien”: eine druckstabile, selbstorganisierte Membran zur Wasserreinigung

Robust Aqua Material: A Pressure‐Resistant Self‐Assembled Membrane for Water Purification

Precrystalline Aggregates Enable Control over Organic Crystallization in Solution

Precrystalline Aggregates Enable Control over Organic Crystallization in Solution

Innenrücktitelbild: Designed Enclosure Enables Guest Binding Within the 4200 Å³ Cavity of a Self‐Assembled Cube (Angew. Chem. 19/2015)

Designed Enclosure Enables Guest Binding Within the 4200 Å³ Cavity of a Self‐Assembled Cube

Inside Back Cover: Designed Enclosure Enables Guest Binding Within the 4200 Å³ Cavity of a Self‐Assembled Cube (Angew. Chem. Int. Ed. 19/2015)

Designed Enclosure Enables Guest Binding Within the 4200 Å³ Cavity of a Self‐Assembled Cube

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