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https://www.readbyqxmd.com/read/28537721/multivariate-chiral-covalent-organic-frameworks-with-controlled-crystallinity-and-stability-for-asymmetric-catalysis
#1
Jie Zhang, Xing Han, Xiaowei Wu, Yan Liu, Yong Cui
The modular construction of covalent organic frameworks (COFs) provides a convenient platform for designing high-performance functional materials, but the synthetic control over their chirality has been relatively little attended. Here we report a multiple-component strategy to construct chiral COFs (CCOFs) with controlled crystallinity and stability for heterogeneous asymmetric catalysis. By crystallizing mixtures of triamines with and without chiral organocatalysts and a dialdehyde, a family of two- and three-component 2D porous CCOFs that adopt three different stacking modes is prepared...
May 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28537718/homochiral-metal-organic-frameworks-with-tunable-nanoscale-channel-array-and-their-enantioseparation-performance-against-chiral-diols
#2
Chao Zhuo, Yuehong Wen, Shengmin Hu, Tianlu Sheng, Ruibiao Fu, Zhenzhen Xue, Hao Zhang, Haoran Li, Jigang Yuan, Xi Chen, Xintao Wu
Enantioseparation is an integral process in the pharmaceutical industry, considering the ever-increasing demand for chiral medicine products. As a new material, porous metal-organic frameworks (MOFs) have shown their potential application in this field because their structures are easy to adjust and control. Though chiral recognition between racemic substrates and frameworks has made preliminary progress, discussions of their size-matching effects are rare. Herein with the help of channel-tunable homochiral MOFs (HMOFs), diols of different sizes have been separated in good enantiomeric excess (ee%)...
May 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28537226/toward-hybrid-au-nanorods-m-au-ag-pd-and-pt-core-shell-heterostructures-for-ultrasensitive-sers-probes
#3
Xiaobin Xie, Guanhui Gao, Shendong Kang, Yanhua Lei, Zhengyin Pan, Tamaki Shibayama, Lintao Cai
Being able to precisely control the morphologies of noble metallic nanostructures is of essential significance for promoting the surface-enhanced Raman scattering (SERS) effect. Herein, we demonstrate an overgrowth strategy for synthesizing Au @ M (M = Au, Ag, Pd, Pt) core-shell heterogeneous nanocrystals with an orientated structural evolution and highly improved properties by using Au nanorods as seeds. With the same reaction condition system applied, we obtain four well-designed heterostructures with diverse shapes, including Au concave nanocuboids (Au CNs), Au @ Ag crystalizing face central cube nanopeanuts, Au @ Pd porous nanocuboids and Au @ Pt nanotrepangs...
May 24, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28535479/adsorption-of-vocs-onto-engineered-carbon-materials-a-review
#4
REVIEW
Xueyang Zhang, Bin Gao, Anne Elise Creamer, Chengcheng Cao, Yuncong Li
Volatile organic compounds (VOCs) severely threaten human health and the ecological environment because most of them are toxic, mutagenic, and carcinogenic. The persistent increase of VOCs together with the stringent regulations make the reduction of VOC emissions more imperative. Up to now, numerous VOC treatment technologies have emerged, such as incineration, condensation, biological degradation, absorption, adsorption, and catalysis oxidation et al. Among them, the adsorption technology has been recognized as an efficient and economical control strategy because it has the potential to recover and reuse both adsorbent and adsorbate...
May 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28535395/a-zinc-chloride-doped-adhesive-facilitates-sealing-at-the-dentin-interface-a-confocal-laser-microscopy-study
#5
Manuel Toledano, Raquel Osorio, Estrella Osorio, Inmaculada Cabello, Manuel Toledano-Osorio, Fátima S Aguilera
The aim of this study was to ascertain the effect of Zn-doping of dental adhesives and mechanical load cycling on the micromorphology of the resin-dentin interdiffusion zone (of sound and caries affected dentin). The investigation considered two different Zn-doped adhesive approaches and evaluated the interface using a doubled dye fluorescent technique and a calcium chelator fluorophore under a confocal laser scanning microscopy. Sound and carious dentin-resin interfaces of unloaded specimens were deficiently resin-hybridized, in general...
May 19, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28535354/high-capacity-and-ultrafast-na-ion-storage-of-self-supported-3d-porous-antimony-persulfide-graphene-foam-architecture
#6
Yanying Lu, Ning Zhang, Shuang Jiang, Yudong Zhang, Meng Zhou, Zhanliang Tao, Lynden A Archer, Jun Chen
The key challenge for high performance sodium-ion batteries is the exploitation of appropriate electrode materials with long cycling stability and high rate capability. Here, we report Sb2S5 nanoparticles (~ 5 nm) uniformly encapsulated in three-dimensional (3D) porous graphene foam, which were fabricated by a facile hydrothermal co-assembly strategy, as a high-performance anode material for sodium-ion batteries. The as-prepared composite can be directly used as electrodes without adding binder or current collector, exhibiting outstanding electrochemical performance with high reversible capacity (845 mAh g-1 at 0...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28534904/porous-copper-graphene-heterostructures-for-cooling-of-electronic-devices
#7
Hokyun Rho, Yea Sol Jang, Sungmin Kim, Sukang Bae, Tae-Wook Kim, Dong Su Lee, Jun-Seok Ha, Sang Hyun Lee
Recently, research on micro-electronic and optoelectronic devices has been rapidly increasing. Parts and products related to these devices are becoming smaller and more integrated within circuits. As a result, the heat generated in devices has increased greatly. When excess heat is generated, important properties are affected such as efficiency and lifetime and, in severe cases, this can result in the failure of devices. Therefore, efficient cooling is required and it becomes necessary to study the heat dissipation properties of device materials...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534594/bicyclo-2-2-2-octane-1-4-dicarboxylic-acid-towards-transparent-metal-organic-frameworks
#8
P J Llabres-Campaner, J Pitarch-Jarque, R Ballesteros-Garrido, B Abarca, R Ballesteros, E García-España
The preparation of transparent porous materials can offer a different access towards the study of molecules under solid confined space. Metal-organic frameworks represent a unique opportunity due to their tunable pore size, however aromatic linkers present strong absorption and reduce the transparency. Herein, we report the first example of a MOF with bicyclic organic dicarboxylic linkers and its use as a solid solvent.
May 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28534413/versatile-assembly-of-metal-coordinated-calix-4-resorcinarene-cavitands-and-cages-through-ancillary-linker-tuning
#9
Wen-Yuan Pei, Guohai Xu, Jin Yang, Hui Wu, Banglin Chen, Wei Zhou, Jian-Fang Ma
We propose a design strategy for assembly of metal-coordinated calix[4]resorcinarene cavitands and cages by tuning of the ancillary linkers. Assembly of newly functionalized cavitand with angular isophthalic acid analogs affords three intriguing metal-coordinated cavitands with deep cavities, 1a-1c. Further, by mediating appropriate spacers between two isophthalic acids, two bowl-shaped cavitands are successfully joined together to produce three elegant coordination cages with tunable sizes and shapes, 2a-2c...
May 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28534299/adsorption-onto-mesoporous-silica-using-supercritical-fluid-technology-improves-dissolution-rate-of-carbamazepine-a-poorly-soluble-compound
#10
Aditya V Gandhi, Priyanka Thipsay, Bharat Kirthivasan, Emilio Squillante
The purpose of this research was to design and characterize an immediate-release formulation of carbamazepine (CBZ), a poorly soluble anti-epileptic drug, using a porous silica carrier. Carbon dioxide in its supercritical state (2000 psi, 30-35°C) was used as an anti-solvent to precipitate CBZ onto two particle size variants of silica. Adsorption isotherms were used as a pre-formulation strategy to select optimum ratios of silica and CBZ. The obtained drug-silica formulations were characterized by dissolution studies, differential scanning calorimetry (DSC), powder X-ray diffraction (PXRD), and scanning electron microscopy (SEM)...
May 22, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28533017/morphological-and-physicochemical-characterization-of-porous-starches-obtained-from-different-botanical-sources-and-amylolytic-enzymes
#11
Yaiza Benavent-Gil, Cristina M Rosell
Porous starches might offer an attractive alternative as bio-adsorbents of a variety of compounds. However, morphology and physicochemical properties of starches must be understood before exploring their applications. Objective was to study the action of different amylolytic enzymes for producing porous starches. Wheat, rice, potato and cassava starches were treated with Amyloglucosidase (AMG), α-amylase (AM) and cyclodextrin-glycosyltransferase (CGTase). Morphological characteristics, chemical composition, adsorptive capacity and pasting/thermal properties were assessed...
May 19, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28532900/combinatorial-screening-of-3d-biomaterial-properties-that-promote-myofibrogenesis-for-mesenchymal-stromal-cell-based-heart-valve-tissue-engineering
#12
Jenna Usprech, David A Romero, Cristina H Amon, Craig A Simmons
The physical and chemical properties of a biomaterial integrate with soluble cues in the cell microenvironment to direct cell fate and function. Predictable biomaterial-based control of integrated cell responses has been investigated with two-dimensional (2D) screening platforms, but integrated responses in 3D have largely not been explored systematically. To address this need, we developed a screening platform using polyethylene glycol norbornene (PEG-NB) as a model biomaterial with which the polymer wt% (to control elastic modulus) and adhesion peptide types (RGD, DGEA, YIGSR) and densities could be controlled independently and combinatorially in arrays of 3D hydrogels...
May 19, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28532111/surface-biofunctionalization-of-three-dimensional-porous-poly-lactic-acid-scaffold-using-chitosan-ogp-coating-for-bone-tissue-engineering
#13
Sen Zeng, Jianhua Ye, Zhixiang Cui, Junhui Si, Qianting Wang, Xiaofeng Wang, Kaiping Peng, Wenzhe Chen
As one of the stimulators on bone formation, osteogenic growth peptide (OGP) improves both proliferation and differentiation of the bone cells in vitro and in vivo. The aim of this work was the preparation of three dimensional porous poly(lactic acid) (PLA) scaffold with high porosity from PLA-dioxane-water ternary system with the use of vacuum-assisted solvent casting, phase separation, solvent extraction and particle leaching methods. Then, by surface coating of PLA scaffold with chitosan (CS)/OGP solution, biofunctionalization of PLA scaffold had been completed for application in bone regeneration...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532101/sonochemical-synthesis-of-fructose-1-6-bisphosphate-dicalcium-porous-microspheres-and-their-application-in-promotion-of-osteogenic-differentiation
#14
Chao Qi, Ding Zhou, Ying-Jie Zhu, Tuan-Wei Sun, Feng Chen, Chang-Qing Zhang
Human bone mesenchymal stem cells (hBMSCs) have the ability to differentiate into bone and cartilage for clinical bone regeneration. Biomaterials with an innate ability to stimulate osteogenic differentiation of hBMSCs into bone and cartilage are considered attractive candidates for the applications in bone tissue engineering and regeneration. In this paper, we synthesized fructose 1,6-bisphosphate dicalcium (Ca2FBP) porous microspheres by the sonochemical method, and investigated the ability of Ca2FBP for the promotion of the osteogenic differentiation of hBMSCs...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532086/freeze-casting-for-plga-carbonated-apatite-composite-scaffolds-structure-and-properties
#15
M Schardosim, J Soulié, D Poquillon, S Cazalbou, B Duployer, C Tenailleau, C Rey, R Hübler, C Combes
This paper focuses on the fabrication of three-dimensional porous PLGA-biomimetic carbonated apatite composite scaffolds by freeze-casting and using dimethyl carbonate as a solvent. Several charge/polymer ratios were tested in order to finely understand the influence of the filler rate on the scaffold porosity and mechanical and degradation properties using complementary characterization techniques (SEM, mercury porosimetry and X-ray microtomography). It was demonstrated that the apatite ratio within the composite scaffold has a strong influence in terms of architecture, material cohesion, mechanical properties and in vitro degradation properties...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532084/incorporation-of-bmp-2-loaded-collagen-conjugated-bcp-granules-in-calcium-phosphate-cement-based-injectable-bone-substitutes-for-improved-bone-regeneration
#16
Gun Hee Lee, Preeti Makkar, Kallyanshis Paul, ByongTaek Lee
The objective of the present study was to incorporate surface modified porous multichannel BCP granule into CPC to enhance its in vivo biodegradation and bone tissue growth. The multichannel BCP granule (15wt%) was first coated with collagen subsequent to BMP-2 loading (ccMCG-B). It was then embedded into CPC to form CPC-ccMCG-B system. The newly developed CPC-ccMCG-B system was then examined for SEM, EDX, XRD, setting time, compressive strength, injectability, pH change, BMP-2 release, in vitro as well as in vivo studies and further compared with CPC...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532076/sustained-drug-release-from-surface-modified-uhmwpe-for-acetabular-cup-lining-in-total-hip-implant
#17
R Manoj Kumar, Pallavi Gupta, Sandan Kumar Sharma, Akshat Mittal, Manish Shekhar, Vijayesh Kumar, B V Manoj Kumar, Partha Roy, Debrupa Lahiri
Despite sterilization and aseptic procedure, bacterial infection remains a key challenge in total hip arthroplasties. This fact emphasizes the urgent need for development of new implant systems, which should releases the drug in a controlled manner without sparing its mechanical and tribological properties. In this study, the lining material of the acetabular cup, in total hip implant, has been modified for sustained release of drugs, which should be available throughout the site of implantation to fight the post-operation bacterial infection...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532070/ribose-mediated-crosslinking-of-collagen-hydroxyapatite-hybrid-scaffolds-for-bone-tissue-regeneration-using-biomimetic-strategies
#18
Gopal Shankar Krishnakumar, Natalia Gostynska, Elisabetta Campodoni, Massimiliano Dapporto, Monica Montesi, Silvia Panseri, Anna Tampieri, Elizaveta Kon, Maurilio Marcacci, Simone Sprio, Monica Sandri
This study explores for the first time the application of ribose as a highly biocompatible agent for the crosslinking of hybrid mineralized constructs, obtained by bio-inspired mineralization of self-assembling Type I collagen matrix with magnesium-doped-hydroxyapatite nanophase, towards a biomimetic mineralized 3D scaffolds (MgHA/Coll) with excellent compositional and structural mimicry of bone tissue. To this aim, two different crosslinking mechanisms in terms of pre-ribose glycation (before freeze drying) and post-ribose glycation (after freeze drying) were investigated...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532065/in-vitro-performance-of-ag-incorporated-hydroxyapatite-and-its-adhesive-porous-coatings-deposited-by-electrostatic-spraying
#19
Ozkan Gokcekaya, Thomas J Webster, Kyosuke Ueda, Takayuki Narushima, Celaletdin Ergun
Bacterial infection of implanted materials is a significant complication that might require additional surgical operations for implant retrieval. As an antibacterial biomaterial, Ag-containing hydroxyapatite (HA) may be a solution to reduce the incidences of implant associated infections. In this study, pure, 0.2mol% and 0.3mol% Ag incorporated HA powders were synthesized via a precipitation method. Colloidal precursor dispersions prepared from these powders were used to deposit porous coatings onto titanium and stainless steel substrates via electrostatic spraying...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532063/biodegradable-galactitol-based-crosslinked-polyesters-for-controlled-release-and-bone-tissue-engineering
#20
Janeni Natarajan, Sahitya Movva, Giridhar Madras, Kaushik Chatterjee
Various classes of biodegradable polymers have been explored towards finding alternates for the existing treatments for bone disorders. In this framework, two families of polyesters using an array of crosslinkers were synthesized. One was based on galactiol/adipic acid and the other based on galactitol/dodecanedioic acid. The structures of the polymers were confirmed by FTIR and further confirmed by (1)H NMR. DSC showed that the polymers were amorphous and the glass transition temperature increased with increase in crosslinking...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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