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https://www.readbyqxmd.com/read/29161664/sandwich-type-biosensor-for-the-detection-of-%C3%AE-2-3-sialylated-glycans-based-on-fullerene-palladium-platinum-alloy-and-4-mercaptophenylboronic-acid-nanoparticle-hybrids-coupled-with-au-methylene-blue-mal-signal-amplification
#1
Qiqi Yuan, Junlin He, Yazhen Niu, Jun Chen, Yilin Zhao, Yuchan Zhang, Chao Yu
α2,3-sialylated glycans (α2,3-sial-Gs) are one of the significant tumour biomarkers for the early diagnosis of cancer. In this work, a neoteric sandwich-type biosensor was developed for detecting α2,3-sial-Gs using 4-mercaptophenylboronic acid (4-MPBA) to construct a novel molecular recognition system by the coordination of a boron atom of 4-MPBA to the amide group of Neu5Ac in the α2,3-sial-Gs structure. Amino-functionalized fullerene coupled with palladium-platinum bimetallic alloy nanocrystals (n-C60-PdPt) was synthesized to modify the surface of a glassy carbon electrode (GCE) because the n-C60 nanomaterial affords a large surface area for the on-site reduction of bimetallic alloy nanoparticles and an excellent capacity for electron transfer...
November 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29149565/enhanced-magnetic-hybridization-of-a-spinterface-through-insertion-of-a-two-dimensional-magnetic-oxide-layer
#2
Alberto Brambilla, Andrea Picone, Dario Giannotti, Alberto Calloni, Giulia Berti, Gianlorenzo Bussetti, Simona Achilli, Guido Fratesi, Mario Italo Trioni, Giovanni Vinai, Piero Torelli, Giancarlo Panaccione, Lamberto Duò, Marco Finazzi, Franco Ciccacci
Interfaces between organic semiconductors and ferromagnetic metals offer intriguing opportunities in the rapidly developing field of organic spintronics. Understanding and controlling the spin-polarized electronic states at the interface is the key towards a reliable exploitation of this kind of systems. Here we propose an approach consisting in the insertion of a two-dimensional magnetic oxide layer at the interface, with the aim of both increasing the reproducibility of the interface preparation and offering a way for a further fine control over the electronic and magnetic properties...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29148552/explaining-the-symmetry-breaking-observed-in-the-endofullerenes-h2-c60-hf-c60-and-h2o-c60
#3
Peter M Felker, Vojtěch Vlček, Isaac Hietanen, Stephen FitzGerald, Daniel Neuhauser, Zlatko Bačić
Symmetry breaking has been recently observed in the endofullerenes M@C60 (M = H2, HF, H2O), manifesting in the splittings of the three-fold degenerate ground states of the endohedral ortho-H2, ortho-H2O and the j = 1 level of HF. The nature of the interaction causing the symmetry breaking is established in this study. A fragment of the solid C60 is considered, comprised of the central C60 molecule surrounded by twelve nearest-neighbor (NN) C60 molecules. The fullerenes have either P (major) or H (minor) orientational orderings, and are assumed to be rigid with Ih symmetry...
November 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29139493/novel-fullerene-based-porous-materials-constructed-by-a-solvent-knitting-strategy
#4
Chengxin Zhang, Shaolei Wang, Bien Tan
Here we choose a dihydronaphthyl-functionalized C60 fullerene as a building block and utilize a novel solvent knitting strategy based on Friedel-Crafts alkylation reaction to construct two kinds of novel porous materials by using dichloromethane (DCM) and 1,2-dichloroethane (DCE) as solvents and external crosslinkers. The resulting porous materials show relatively high apparent BET surface areas and gas uptake abilities.
November 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29135946/sensitivity-to-heavy-metal-ions-of-unfolded-fullerene-quantum-dots
#5
Erica Ciotta, Stefano Paoloni, Maria Richetta, Paolo Prosposito, Pietro Tagliatesta, Chiara Lorecchio, Iole Venditti, Ilaria Fratoddi, Stefano Casciardi, Roberto Pizzoferrato
A novel type of graphene-like quantum dots, synthesized by oxidation and cage-opening of C60 buckminsterfullerene, has been studied as a fluorescent and absorptive probe for heavy-metal ions. The lattice structure of such unfolded fullerene quantum dots (UFQDs) is distinct from that of graphene since it includes both carbon hexagons and pentagons. The basic optical properties, however, are similar to those of regular graphene oxide quantum dots. On the other hand, UFQDs behave quite differently in the presence of heavy-metal ions, in that multiple sensitivity to Cu(2+), Pb(2+) and As(III) was observed through comparable quenching of the fluorescent emission and different variations of the transmittance spectrum...
November 14, 2017: Sensors
https://www.readbyqxmd.com/read/29134757/asymmetric-fullerene-nanosurfactant-interface-engineering-for-automatic-molecular-alignments
#6
Dae-Yoon Kim, Sang-A Lee, Soeun Kim, Changwoon Nah, Seung Hee Lee, Kwang-Un Jeong
Since the molecular self-assembly of nanomaterials is sensitive to their surface properties, the molecular packing structure on the surface is essential to build the desired chemical and physical properties of nanomaterials. Here, a new nanosurfactant is proposed for the automatic construction of macroscopic surface alignment layer for liquid crystal (LC) molecules. An asymmetric nanosurfactant (C60 NS) consisted of mesogenic cyanobiphenyl moieties with flexible alkyl chains and a [60]fullerene nanoatom is newly designed and precisely synthesized...
November 14, 2017: Small
https://www.readbyqxmd.com/read/29131597/facile-low-temperature-synthesis-of-cellulose-nanocrystals-carrying-buckminsterfullerene-and-its-radical-scavenging-property-in-vitro
#7
Jinxian Lin, Zhijing Zhong, Qunling Li, Zhaoyi Tan, Tao Lin, Yi Quan, Dong Zhang
Buckminsterfullerene (C60), known for its strong radical scavenging properties, has been studied extensively for its biomedical applications. Its clinical use would be promoted by novel functionalisation of C60 with the aid of drug delivery carriers based on nanoparticle technologies. Cellulose nanocrystals (CNCs), have been recently exploited as a promising nanoplatform for drug delivery, owing to their intriguing attributes such as nanoscale dimensions, low toxicity, broad chemical-modifying capacity, and biocompatibility...
November 13, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29131542/the-three-dimensional-structure-of-twisted-benzo-ghi-perylene-triimide-dimer-as-a-non-fullerene-acceptor-for-inverted-perovskite-solar-cells
#8
Priyadharsini Karuppuswamy, Hung-Cheng Chen, Pen-Cheng Wang, Chao-Ping Hsu, Ken-Tsung Wong, Chih Wei Chu
In this work, we introduced benzo[ghi]perylenetriimide (BPTI) derivatives including monomer and twisted dimer (t-BPTI) as an alternative electron transport layer (ETL) material to replace the commonly used PC61BM in inverted planar heterojunction perovskite solar cells. Moreover, the double ETL layer was applied in our perovskite solar cells with structure of glass/ITO/PEDOT:PSS/perovskite/BPTI/C60 or PDI-C4/BCP/Al. Use of a double ETL layer structure can effectively eliminate the leakage current. The devices with the t-BPTI/C60 double ETL layer yield an average power conversion efficiency of 10...
November 12, 2017: ChemSusChem
https://www.readbyqxmd.com/read/29131227/controlling-electron-and-energy-transfer-paths-by-selective-excitation-in-a-zinc-porphyrin-bodipy-c60-multi-modular-triad
#9
Christopher O Obondi, Gary N Lim, Priscilla Martinez, Varghese Swamy, Francis D'Souza
A multi-modular donor-acceptor triad composed of zinc porphyrin, BF2-chelated dipyrromethene (BODIPY), and C60 was newly synthesized, with the BODIPY entity at the central position. Using absorbance and emission spectral, electrochemical redox, and computational optimization results, energy level diagrams for the ZnP-BODIPY dyad and ZnP-BODIPY-C60 triad were constructed to envision the different photochemical events upon selective excitation of the BODIPY and ZnP entities. By transient absorption spectral studies covering a wide femtosecond-to-millisecond time scale, evidence for the different photochemical events and their kinetic information was secured...
November 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/29127901/cerium-dioxide-doped-carboxyl-fullerene-as-novel-nanoprobe-and-catalyst-in-electrochemical-biosensor-for-amperometric-detection-of-the-cyp2c19-2-allele-in-human-serum
#10
Chengli Zhang, Junlin He, Yuchan Zhang, Jun Chen, Yilin Zhao, Yazhen Niu, Chao Yu
The disposition dose of clopidogrel is different in CYP2C19*2 gene carriers and non-carriers. High-dose clopidogrel has been recommended to overcome a low-responsiveness to clopidogrel in patients with the CYP2C19*2 gene. To guide the choice of clopidogrel dosage and catalyse a development in the field of personalized therapy, we developed an ultrasensitive electrochemical biosensor to detect CYP2C19*2 gene. We constructed a novel assay based on cerium dioxide (CeO2)-functionalized carboxyl fullerene (c-C60) supported by Pt nanoparticles (c-C60/CeO2/PtNPs) for signal amplification...
November 8, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29126815/analysis-of-suicide-risk-in-patients-with-penile-cancer-and-review-of-the-literature
#11
REVIEW
William G Simpson, Zachary Klaassen, Rita P Jen, William M Hughes, Durwood E Neal, Martha K Terris
The treatment for penile cancer has been shown to cause harmful psychiatric symptoms as well as have detrimental effects on well-being. In the past several years, alternatives to total or partial penectomy have emerged, such as chemotherapy, radiation, penile sparing, and laser ablation therapies. A more specific breakdown for penile cancer is in order as the therapy has the potential for life changing surgery. We examined the Surveillance, Epidemiology, and End Results (SEER) database (1973-2013), comprising 28% of the United States population...
October 3, 2017: Clinical Genitourinary Cancer
https://www.readbyqxmd.com/read/29125155/formation-of-spherical-ice-shells-inside-carbon-fullerenes
#12
Roxanne M Tutchton, Zhigang Wu
The structural and dynamic properties of encapsulated water inside fullerene cages, C60 to C320, were investigated employing classical molecular dynamics simulations. We find that the confined water forms single to multiple concentric, spherical shells as the size of the fullerene increases. This is possible due to the reduced number of hydrogen bonds per water molecule in the nanoscale liquid as compared to bulk water, allowing the encapsulated H2O molecules to imitate the shape of the confining boundary. These water-cluster shells exhibit solid-like behavior at temperatures as high as 500 K...
November 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29121930/buckyballs-conjugated-with-nucleic-acid-sequences-identifies-microorganisms-in-live-cell-assays
#13
Qingsu Cheng, Bahram Parvin
BACKGROUND: Rapid identification of bacteria can play an important role at the point of care, evaluating the health of the ecosystem, and discovering spatiotemporal distributions of a bacterial community. We introduce a method for rapid identification of bacteria in live cell assays based on cargo delivery of a nucleic acid sequence and demonstrate how a mixed culture can be differentiated using a simple microfluidic system. METHODS: C60 Buckyballs are functionalized with nucleic acid sequences and a fluorescent reporter to show that a diversity of microorganisms can be detected and identified in live cell assays...
November 9, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/29120161/2d-material-armors-showing-superior-impact-strength-of-few-layers
#14
Stefano Signetti, Simone Taioli, Nicola M Pugno
We study the ballistic properties of two-dimensional (2D) materials upon the hypervelocity impacts of C60 fullerene molecules combining ab initio density functional tight binding and finite element simulations. The critical penetration energy of monolayer membranes is determined using graphene and the 2D allotrope of boron nitride as case studies. Furthermore, the energy absorption scaling laws with a variable number of layers and interlayer spacing are investigated, for homogeneous or hybrid configurations (alternated stacking of graphene and boron nitride)...
November 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29119190/reactivity-and-regioselectivity-in-diels-alder-reactions-of-anion-encapsulated-fullerenes
#15
Cheng-Xing Cui, Zhao-Pei Zhang, Lei Zhu, Ling-Bo Qu, Yu-Ping Zhang, Yu Lan
Encapsulation and surface chemical modification are methodologies to enhance the properties of fullerenes for various applications. Herein, density functional theory calculations are performed to study the Diels-Alder (DA) reactivity of anion encapsulated C60, including [X@C60](-) (X = F, Cl, Br, or I), [S@C60](2-), and [N@C60](3-). Computational results reveal that encapsulated Cl(-), Br(-), I(-), or S(2-) anions are located close to the center of the C60 molecule; however, encapsulated F(-) is displaced from the center...
November 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29115332/unraveling-current-hysteresis-effects-in-regular-type-c60-ch3nh3pbi3-heterojunction-solar-cells
#16
Lung-Chien Chen, Yu-Shiang Lin, Po-Wen Tang, Chao-Yi Tai, Zong-Liang Tseng, Ja-Hon Lin, Sheng-Hui Chen, Hao-Chung Kuo
Comprehensive studies were carried out to understand the origin of the current hysteresis effects in highly efficient C60-CH3NH3PbI3(MAPbI3) heterojunction solar cells, using atomic-force microscopy, transmittance spectra, photoluminescence spectra, X-ray diffraction patterns and a femtosecond time-resolved pump-probe technique. The power conversion efficiency (PCE) of C60-MAPbI3 solar cells can be increased to 18.23% by eliminating the point (lattice) defects in the MAPbI3 thin film which is fabricated by using the one-step spin-coating method with toluene washing treatment...
November 8, 2017: Nanoscale
https://www.readbyqxmd.com/read/29115325/synthesis-and-epr-studies-of-the-first-water-soluble-n-c60-derivative
#17
Stuart P Cornes, Shen Zhou, Kyriakos Porfyrakis
The first water-soluble derivative of the paramagnetic endohedral fullerene N@C60 has been prepared through the covalent attachment of a single addend containing two permethylated β-cyclodextrin units to the surface of the carbon cage. The line width of the derivative's EPR signal is highly sensitive to both the nature of the solvent and the presence of Cu(ii) ions in solution.
November 8, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29114988/highly-crystalline-mesoporous-c60-with-ordered-pores-a-new-class-of-nanomaterials-for-energy-applications
#18
Mercy Benzigar, Stalin Joseph, Hamid Ilbeygi, Dae-Hwan Park, Sujoy Sarkar, Goutam Chandra, Siva Umapathy, Sampath Srinivasan, Siddulu Talapaneni, Ajayan Vinu
Highly ordered mesoporous C60 with well-ordered porous structure and a high crystallinity is prepared through the nanohard templating method using saturated solution of C60 in 1-chloronaphthalene (51 mg mL-1) as a C60 precursor and SBA-15 as a hard template. The high solubility of C60 in 1-chloronaphthalene helps not only to encapsulate a huge amount of the C60 into the mesopores of the template but also supports the oligomerization of C60 and the formation of crystalline walls made of C60. The obtained mesoporous C60 exhibits a rod shaped morphology, a high specific surface area (680 m2 g-1), tuneable pores, and a highly crystalline wall structure...
November 8, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29114980/synthesis-of-metal-complexes-with-an-open-cage-fullerene-as-the-ligand
#19
Liangbing Gan, Zishuo Zhou, Nana Xin
An open-cage C60 derivative 9 with anilino, hemiketal and lactone moieties on the rim of the orifice was prepared through a fullerene-mixed peroxide procedure. Key steps include decarbonylation, intramolecular Friedel-Crafts reaction and oxetane ring opening rearrangement. The open-cage compound 9 readily reacts with various metal salts. A nickel complex was obtained by treating 9 with NiCl2 at r.t. followed by purification on silica gel column. Single crystal X-ray diffraction analysis showed that the nickel ion is coordinated to two ligands with an octahedral geometry...
November 7, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29111726/tddft-study-of-the-optical-excitation-of-nucleic-acid-bases-c60-complexes
#20
Sherif Abdulkader Tawfik, X Y Cui, S P Ringer, C Stampfl
The potential of C60 as a nucleic acid base (NAB) optical sensor is theoretically explored. We investigate the adsorption of four NABs, namely, adenine, cytosine, guanine, and thymine, on C60 in the gas phase. For the optimal NAB@C60 adsorption configurations, obtained using a dispersion-corrected density functional, we calculate the vis-near-ultraviolet optical response using time-dependent density functional theory. While the isolated C60 and NAB molecules do not exhibit visible optical excitation, we find that C60/NAB conjugation gives rise to distinct spectral features in the visible range...
November 15, 2017: Journal of Physical Chemistry. A
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