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https://www.readbyqxmd.com/read/28641143/spectroscopic-and-thermodynamic-studies-of-light-harvesting-perylenediimide-derivative-zinc-porphyrin-complex-in-aqueous-media
#1
Ahmed El-Refaey, Shaban Y Shaban, Maged El-Kemary, Mohamed E El-Khouly
Self-assembly of perylene derivative such as N,N'-bis(2(trimethylammonium iodide) ethylene)perylene-3,4,9,10-tetracarboxyldiimide (TAIPDI) can produce one-dimensional form (1D) in an aqueous media. The ability of one-dimensional TAIPDI to form light harvesting complex with water-soluble zinc porphyrin (ZnTPPS4) via the π-π and electrostatic interactions has been described. Owing to electronic interactions between the π-systems, the complex formation is accompanied by pronounced absorption spectral changes in the UV/Vis absorption bands...
June 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28640997/from-1d-polymers-to-2d-polymers-preparation-of-free-standing-single-monomer-thick-two-dimensional-conjugated-polymers-in-water
#2
Na Zhang, Taisheng Wang, Xing Wu, Chen Jiang, Taiming Zhang, Bangkun Jin, Hengxing Ji, Wei Bai, Ruke Bai
Recently, investigation on two-dimensional (2D) organic polymers has been made a great progress and conjugated 2D polymers already play a dynamic role in both academic and practical applications. However, a convenient, non-interfacial approach to obtain single-layer 2D polymers in solution, especially in aqueous media remains challenging. Herein, we present a facile, highly efficient and versatile "1D to 2D" strategy for preparation of free-standing single-monomer-thick conjugated 2D polymers in water without any aid...
June 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28640613/molecular-recognition-under-interfacial-conditions-calix-4-pyrrole-based-cross-linkable-micelles-for-ion-pair-extraction
#3
Xiaodong Chi, Gretchen Marie Peters, Forrest Hammel, Chandler Brockman, Jonathan L Sessler
An anthracene-functionalized, long-tailed calix[4]pyrrole 1, containing both an anion-recognition site and cation-recognition functionality, has been synthesized and fully characterized. Upon ion-pair complexation with FeF2, receptor 1 self-assembles into multi-micelles in aqueous media. This aggregation process is ascribed to a change in polarity from non-polar to amphiphilic induced upon concurrent anion and cation complexation and permits molecular recognition-based control over chemical morphology under interfacial conditions...
June 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28636369/dynamics-of-charged-species-in-ionic-neutral-block-copolymer-and-surfactant-complexes
#4
Jose M Borreguero, Philip A Pincus, Bobby G Sumpter, Monojoy Goswami
Structure-property relationships of ionic block copolymer (BCP) surfactant complexes are critical towards the progress of favorable engineering design of efficient charge transport materials. In this article, molecular dynamics simulations are used to understand the dynamics of charge-neutral BCP and surfactant complexes. The dynamics are examined for two different systems, charged-neutral double hydrophilic and hydrophobic-hydrophilic block copolymers with oppositely charged surfactant moieties. The dynamics of the surfactant head, tails and charges are studied for five different BCP volume fractions...
June 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28636347/the-structure-and-dynamics-of-alginate-gels-crosslinked-by-polyvalent-ions-probed-via-solid-state-nmr-spectroscopy
#5
Jiří Brus, Martina Urbanová, Jiri Czernek, Miroslava Pavelkova, Katerina Kubova, Jakub Vyslouzil, Sabina Abbrent, Rafal Konefal, Jiri Horsky, David Vetchy, Jan Vysloužil, Pavel Kulich
Alginate gels are an outstanding biomaterial widely applicable in tissue engineering, medicine, and pharmacy for cell transplantation, wound healing and efficient bioactive agent delivery, respectively. This contribution provides new and comprehensive insight into the atomic-resolution structure and dynamics of polyvalent ion-crosslinked alginate gels in microbead formulations. By applying various advanced solid-state NMR (ssNMR) spectroscopy techniques, we verified the homogenous distribution of the crosslinking ions in the alginate gels and the high degree of ion exchange...
June 21, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28636320/dna-loading-and-release-using-custom-tailored-poly-l-lysine-surfaces
#6
Amin Shakiba, Sagar L Patil, Oussama Zenasni, Monika E Schmitt, Preethi H Gunaratne, T Randall Lee
This manuscript describes the generation and study of surfaces modified with custom-crafted poly(L-lysine) (PLL) coatings for use in the loading and delivery of single-stranded DNA (ssDNA). The experimental strategy utilizes bidentate dithiol adsorbates to generate stably-bound azide-terminated self-assembled monolayers (SAMs) on gold possessing an oligo(ethylene glycol) (OEG) spacer. Consequent to the molecular assembly on gold, the azide termini are covalently attached to a maleimide linker moiety via a copper-catalyzed azide-alkyne "click" reaction...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28636029/cross-impact-of-surface-and-interaction-anisotropy-in-the-self-assembly-of-organic-adsorption-monolayers-a-monte-carlo-and-transfer-matrix-study
#7
V A Gorbunov, S S Akimenko, A V Myshlyavtsev
Using a simple lattice gas model we study the features of self-assembly in adsorption layers where both "molecule-surface" and "molecule-molecule" interactions are anisotropic. Based on the example of adsorption layers of mono-functional organic molecules on the heterogeneous surface with strip-like topography, we have revealed plenty of possible self-assembled structures in this simple system, such as discrete, linear, zigzag, chess board-like, two-dimensional porous and close-packed patterns. However, the phase behavior of the adsorption layer is much richer, if the interactions between functional and non-functional parts of adjacent adsorbed molecules have comparable strength and opposite signs...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28636028/supramolecular-functional-assemblies-dynamic-membrane-transporters-and-peptide-nanotubular-composites
#8
Alberto Fuertes, Marisa Juanes, Juan R Granja, Javier Montenegro
The fabrication of functional molecular devices constitutes one of the most important current challenges for chemical sciences. The complex processes accomplished by living systems continuously demand the assistance of non-covalent interactions between molecular building blocks. Additionally, these building blocks (proteins, membranes, nucleotides) are also constituted by self-assembled structures. Therefore, supramolecular chemistry is the discipline required to understand the properties of the minimal self-assembled building blocks of living systems and to develop new functional smart materials...
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28635956/self-assembled-three-dimensional-network-designs-for-soft-electronics
#9
Kyung-In Jang, Kan Li, Ha Uk Chung, Sheng Xu, Han Na Jung, Yiyuan Yang, Jean Won Kwak, Han Hee Jung, Juwon Song, Ce Yang, Ao Wang, Zhuangjian Liu, Jong Yoon Lee, Bong Hoon Kim, Jae-Hwan Kim, Jungyup Lee, Yongjoon Yu, Bum Jun Kim, Hokyung Jang, Ki Jun Yu, Jeonghyun Kim, Jung Woo Lee, Jae-Woong Jeong, Young Min Song, Yonggang Huang, Yihui Zhang, John A Rogers
Low modulus, compliant systems of sensors, circuits and radios designed to intimately interface with the soft tissues of the human body are of growing interest, due to their emerging applications in continuous, clinical-quality health monitors and advanced, bioelectronic therapeutics. Although recent research establishes various materials and mechanics concepts for such technologies, all existing approaches involve simple, two-dimensional (2D) layouts in the constituent micro-components and interconnects. Here we introduce concepts in three-dimensional (3D) architectures that bypass important engineering constraints and performance limitations set by traditional, 2D designs...
June 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28635681/antimicrobial-activity-of-nitric-oxide-releasing-ti-6al-4v-metal-oxide
#10
Nina A Reger, Wilson S Meng, Ellen S Gawalt
Titanium and titanium alloy materials are commonly used in joint replacements, due to the high strength of the materials. Pathogenic microorganisms can easily adhere to the surface of the metal implant, leading to an increased potential for implant failure. The surface of a titanium-aluminum-vanadium (Ti-6Al-4V) metal oxide implant material was functionalized to deliver an small antibacterial molecule, nitric oxide. S-nitroso-penicillamine, a S-nitrosothiol nitric oxide donor, was covalently immobilized on the metal oxide surface using self-assembled monolayers...
June 21, 2017: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/28635550/peptide-grafted-and-self-assembled-poly-%C3%AE-glutamic-acid-phenylalanine-nanoparticles-targeting-camptothecin-to-glioma
#11
Hitesh Kulhari, Srinivasa R Telukutla, Deep Pooja, Ravi Shukla, Ramakrishna Sistla, Vipul Bansal, David J Adams
AIM: To synthesize cRGDfK peptide conjugated poly(γ-glutamic acid)-phenylalanine nanoparticles to improve the therapeutic efficacy of camptothecin (CPT) against glioblastoma multiforme. METHODS: Peptide-conjugated, drug-loaded nanoparticles (cRGDfK-conjugated camptothecin-loaded PGA-PA nanoparticles [RCPN]) were prepared and physico-chemically characterized using different techniques. Nanoparticles were evaluated for in vitro anticancer activity, cellular uptake, induction of apoptosis and wound healing cell migration against U87MG human glioblastoma cells...
June 21, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28635326/encapsulins-molecular-biology-of-the-shell
#12
Robert J Nichols, Caleb Cassidy-Amstutz, Thawatchai Chaijarasphong, David F Savage
Compartmentalization is both a fundamental principle of cellular organization and an emerging theme in prokaryotic biology. Work in the past few decades has shown that protein-based organelles called microcompartments enhance the function of encapsulated cargo proteins. More recently, the repertoire of known prokaryotic organelles has expanded beyond microcompartments to include a new class of smaller proteinaceous compartments, termed nanocompartments (also known as encapsulins). Nanocompartments are icosahedral capsids that are smaller and less complex than microcompartments...
June 21, 2017: Critical Reviews in Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28635292/assembly-morphology-diffusivity-and-indentation-of-hydrogel-supported-lipid-bilayers
#13
Tooba Shoaib, Prathima Chandra Nalam, Yichen He, Yuting Chen, Rosa M Espinosa-Marzal
Recognizing the limitations of solid-supported lipid bilayers to reproduce the behavior of cell membranes, including bendability, transmembrane protein inclusion and virus entry, this study describes a novel biomimetic system for cell membranes with the potential to overcome these and other limitations. The developed strategy utilizes a hydrogel with tunable mechanical behavior that resembles those of living cells as the soft support for the phospholipid bilayer, while a polyelectrolyte multilayer film serves as an intermediate layer to facilitate the self-assembly of the lipid bilayer on the soft cushion...
June 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28635252/proton-fueled-reversible-dna-hybridization-chain-assembly-for-ph-sensing-and-imaging
#14
Lan Liu, Jin-Wen Liu, Zhi-Mei Huang, Han Wu, Na Li, Li-Juan Tang, Jian-Hui Jiang
Design of DNA self-assembly with reversible responsiveness to external stimuli is of great interest for diverse applications. We for the first time develop a pH-responsive, fully reversible hybridization chain reaction (HCR) assembly that allows sensitive sensing and imaging of pH in living cells. Our design relies on the triplex forming sequences that form DNA triplex with toehold regions under acidic conditions and then induce a cascade of strand displacement and DNA assembly. The HCR assembly has shown dynamic responses in physiological pH ranges with excellent reversibility and demonstrated the potential for in vitro detection and live-cell imaging of pH...
June 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28635187/the-viologen-cation-radical-pimer-a-case-of-dispersion-driven-bonding
#15
Margarita Geraskina, Andrew S Dutton, Mark Juetten, Samuel Wood, Arthur Winter
Pi bonds between organic radicals have generated recent excitement as an orthogonal interaction for designing self-assembling architectures in water. Here, we provide the first a systematic investigation of the effect of the viologen cation radical structure on the strength and nature of the pimer bond. A striking and unexpected feature of the this pi bond is that the bond strength is unchanged by substitution with electron-donating groups or withdrawing groups or with increased conjugation. Furthermore, the interaction is undiminished by sterically bulky N-alkyl groups...
June 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28635174/flash-light-millisecond-self-assembly-of-high-%C3%AF-block-copolymers-for-wafer-scale-sub-10-nm-nanopatterning
#16
Hyeong Min Jin, Dae Yong Park, Seong-Jun Jeong, Gil Yong Lee, Ju Young Kim, Jeong Ho Mun, Seung Keun Cha, Joonwon Lim, Jun Soo Kim, Kwang Ho Kim, Keon Jae Lee, Sang Ouk Kim
One of the fundamental challenges encountered in successful incorporation of directed self-assembly in sub-10 nm scale practical nanolithography is the process compatibility of block copolymers with a high Flory-Huggins interaction parameter (χ). Herein, reliable, fab-compatible, and ultrafast directed self-assembly of high-χ block copolymers is achieved with intense flash light. The instantaneous heating/quenching process over an extremely high temperature (over 600 °C) by flash light irradiation enables large grain growth of sub-10 nm scale self-assembled nanopatterns without thermal degradation or dewetting in a millisecond time scale...
June 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28635143/controlling-the-photonic-properties-of-cholesteric-cellulose-nanocrystal-films-with-magnets
#17
Bruno Frka-Petesic, Giulia Guidetti, Gen Kamita, Silvia Vignolini
The self-assembly of cellulose nanocrystals is a powerful method for the fabrication of biosourced photonic films with a chiral optical response. While various techniques have been exploited to tune the optical properties of such systems, the presence of external fields has yet to be reported to significantly modify their optical properties. In this work, by using small commercial magnets (≈ 0.5-1.2 T) the orientation of the cholesteric domains is enabled to tune in suspension as they assemble into films...
June 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28634606/a-new-aie-multi-block-polyurethane-copolymer-material-for-subcellular-microfilament-imaging-in-living-cells
#18
Yu-Qing Niu, Tao He, Jun Song, Si-Ping Chen, Xiang-Yu Liu, Zhi-Gang Chen, Ying-Jie Yu, Shi-Guo Chen
A multi-block fluorescent amphiphilic polyurethane copolymer (TPE-PU), self-assembling into hairy, water-soluble micelles, is used as a subcellular microfilament probe in living cells.
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28634499/three-input-gate-logic-circuits-on-chemically-assembled-single-electron-transistors-with-organic-and-inorganic-hybrid-passivation-layers
#19
Yutaka Majima, Guillaume Hackenberger, Yasuo Azuma, Shinya Kano, Kosuke Matsuzaki, Tomofumi Susaki, Masanori Sakamoto, Toshiharu Teranishi
Single-electron transistors (SETs) are sub-10-nm scale electronic devices based on conductive Coulomb islands sandwiched between double-barrier tunneling barriers. Chemically assembled SETs with alkanethiol-protected Au nanoparticles show highly stable Coulomb diamonds and two-input logic operations. The combination of bottom-up and top-down processes used to form the passivation layer is vital for realizing multi-gate chemically assembled SET circuits, as this combination enables us to connect conventional complementary metal oxide semiconductor (CMOS) technologies via planar processes...
2017: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/28633567/endogenous-bioelectric-signaling-networks-exploiting-voltage-gradients-for-control-of-growth-and-form
#20
Michael Levin, Giovanni Pezzulo, Joshua M Finkelstein
Living systems exhibit remarkable abilities to self-assemble, regenerate, and remodel complex shapes. How cellular networks construct and repair specific anatomical outcomes is an open question at the heart of the next-generation science of bioengineering. Developmental bioelectricity is an exciting emerging discipline that exploits endogenous bioelectric signaling among many cell types to regulate pattern formation. We provide a brief overview of this field, review recent data in which bioelectricity is used to control patterning in a range of model systems, and describe the molecular tools being used to probe the role of bioelectrics in the dynamic control of complex anatomy...
June 21, 2017: Annual Review of Biomedical Engineering
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