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Journal of Colloid and Interface Science

Meng Tian, Yu Long, Dan Xu, Shuoyun Wei, Zhengping Dong
Nowadays, chemical catalytic methods for the treatment of organic wastes are attracting more and more research attention. In the current research, novel catalysts with palladium nanoparticles (Pd NPs) supported on the hollow mesoporous silica nanotubes (h-mSiO2 ) were synthesized for the catalytic reduction of 4-nitrophenol (4-NP) and hydrodechlorination (HDC) of 4-chlorophenol (4-CP). The key point for the fabrication of the catalysts is that a certain thickness of the silica shell was wrapped on the multiwalled carbon nanotubes (MWNTs) or Pd/MWNTs through biphase stratification approach, and then the samples were calcined to remove the MWNTs...
March 14, 2018: Journal of Colloid and Interface Science
Zhulan Gu, Shumin Li, Zhiping Xiong, Hui Xu, Fei Gao, Yukou Du
Bimetallic nanocatalysts with small particle size benefit from markedly enhanced electrocatalytic activity and stability during small molecule oxidation. Herein, we report a facile method to synthesize binary Pt-Ru nanoparticles dispersed on a carbon support at an optimum temperature. Because of its monodispersed nanostructure, synergistic effects were observed between Pt and Ru and the PtRu/C electrocatalysts showed remarkably enhanced electrocatalytic activity towards ethanol oxidation. The peak current density of the Pt1 Ru1 /C electrocatalyst is 3731 mA mg-1 , which is 9...
March 13, 2018: Journal of Colloid and Interface Science
Shijie Li, Shiwei Hu, Wei Jiang, Yanping Liu, Yingtang Zhou, Yu Liu, Liuye Mo
A huge challenge in the field of pollutant removal is the scarcity of visible-light-driven (VLD) photocatalysts that are efficient, stable, easily recyclable and capable of mineralizing organic pollutants. In this regard, a novel hierarchical architecture of Bi2 MoO6 nanosheets onto NiTiO3 nanofibers for tetracycline hydrochloride (TC) removal was rationally designed and fabricated via a facile approach. In this heterojunction system, highly homogeneous-distributed Bi2 MoO6 nanosheets were anchored on electrospun NiTiO3 nanofibers, endowing the heterojunction with compact interfacial contact...
March 13, 2018: Journal of Colloid and Interface Science
Jiaojiao Jiang, Zipeng Xing, Meng Li, Zhenzi Li, Junwei Yin, Junyan Kuang, Jinlong Zou, Qi Zhu, Wei Zhou
Plasmon Ag decorated 3D urchinlike N-TiO2-x photocatalysts are successfully synthesized by a facile hydrothermal treatment (180 °C) and combined with a photo-deposition approach, followed by a reduction treatment. The results show that the resultant Ag/N-TiO2-x sample possesses a three-dimensional (3D) urchinlike nanostructure with high crystallinity of anatase. Meanwhile, it exhibits the narrow optical band gap (Eg ∼ 2.61 eV) and the excellent visible-light-driven photocatalytic performance. Moreover, the hydrogen generation rate and photocatalytic degradation rate of phenol are up to 186...
March 12, 2018: Journal of Colloid and Interface Science
Chong Chen, Nengjie Feng, Qirui Guo, Zhong Li, Xue Li, Jing Ding, Lei Wang, Hui Wan, Guofeng Guan
Targeting CO2 capture application, a new strategy for building multiple adsorption sites in metal-organic framework MIL-101(Cr) was constructed through the incorporation of diethylenetriamine-based ionic liquid (DETA-Ac) via a post-synthetic modification approach. The DETA-Ac, with multi-amine-tethered cation and acetate anion, could not only provide additional binding sites, but also enhance the affinity of framework surfaces toward CO2 . Simultaneously, the high surface area and large cage size of MIL-101(Cr) ensured the better dispersion of IL, thus exposing more active sites for CO2 adsorption...
March 12, 2018: Journal of Colloid and Interface Science
C J Kuijpers, H P Huinink, N Tomozeiu, S J F Erich, O C G Adan
Due to the increased use of nanoparticles in everyday applications, there is a need for theoretical descriptions of particle transport and attachment in porous media. It should be possible to develop a one dimensional model to describe nanoparticle retention during capillary transport of liquid mixtures in porous media. Water-glycerol-nanoparticle mixtures were prepared and the penetration process in porous Al2 O3 samples of varying pore size is measured using NMR imaging. The liquid and particle front can be measured by utilizing T2 relaxation effects from the paramagnetic nanoparticles...
March 9, 2018: Journal of Colloid and Interface Science
Wei Jiang, Yue Pan, Jiebing Yang, Yong Liu, Yan Yang, Jun Tang, Quanshun Li
Atom transfer radical polymerization (ATRP) has been considered to be an efficient strategy for constructing functional macromolecules owing to its simple operation and versatile monomers, and thus it is of great significance to develop ideal catalysts with higher activity and perfect reusability. We constructed a peroxidase mimic through the grafting of heme onto metal-organic frameworks UiO-66-NH2 (ZrMOF), namely Heme-ZrMOF. After the systematic characterization of structure, the composite Heme-ZrMOF was demonstrated to possess high peroxidase activity using 2,2'-azinobis-(3-ethylbenzthiazoline-6-sulphonate) and 3,3',5,5'-tetramethylbenzidine as substrates...
March 9, 2018: Journal of Colloid and Interface Science
Jennifer Gubitosa, Vito Rizzi, Angela Lopedota, Paola Fini, Anna Laurenzana, Gabriella Fibbi, Fiorenza Fanelli, Andrea Petrella, Valentino Laquintana, Nunzio Denora, Roberto Comparelli, Pinalysa Cosma
HYPOTHESIS: The interesting properties of Gold Nanoparticles (AuNPs) make them attractive for different application fields such as cosmetology, medicine and clinical nanotechnologies. In this work a fast, easy and eco-friendly method for the AuNPs synthesis is proposed by using the Punica Granatum Juice (PGJ) with potential dermatological and cosmetic applications. The AuNPs antioxidant activity, due to the presence of phenols from the juice, and their use as booster for improving the Sun Protection Factor (SPF) in commercial sunscreen formulations, are thus expounded...
March 9, 2018: Journal of Colloid and Interface Science
Chan Wang, Tantan Hu, Zhuoqi Wen, Jingdan Zhou, Xioajie Wang, Qian Wu, Chuanxi Wang
Nitrogen doping can effectly adjust the compositions and structures of carbon dots and hence enhance their fluorescence. In this work, we report a fast and low-cost route for synthesis of nitrogen-doped carbon dots (N-CDs) by microwave pyrolysis of citric acid and ammonium within 7 min. The as-prepared N-CDs contain plentiful oxygen and nitrogen functional groups, and dispaly intense fluorescence with high quantum yield of ca. 44.3% and have an average size of 1.8 nm. The obtained N-CDs exhibit highly stable against photobleaching, ionic strengths, and can be used for selective and sensitive detection of Fe(III)...
March 8, 2018: Journal of Colloid and Interface Science
Weiming Wu, Jiugou Leng, Hailong Mei, Shubin Yang
Defect-rich, boron (B) and nitrogen (N) dual-doped and inert BN covalent bonds-free graphenes (BNGs) can be successfully synthesized via a method of two-step doping combined with chemical etching. B and N doping degree and surface areas of BNGs can be enhanced facilely by chemical etching without forming inert covalent BN bonds. The as-obtained porous BNGs deliver more superior electro-catalytic activity for oxygen reduction reaction than the unetched BNGs and commercial Pt/C catalysts.
March 8, 2018: Journal of Colloid and Interface Science
Fatemeh Kiani, Negar Ashari Astani, Reza Rahighi, Ahmad Tayyebi, Meysam Tayebi, Jafar Khezri, Ehsan Hashemi, Ursula Rothlisberger, Abdolreza Simchi
In the present work, the effect of graphene oxide (GO) nanosheets on the antibacterial activity of CuO nanowire arrays under visible light irradiation is shown. A combined thermal oxidation/electrophoretic deposition technique was employed to prepare three-dimensional networks of graphene oxide nanosheets hybridized with vertically aligned CuO nanowires. With the help of standard antibacterial assays and X-ray photoelectron spectroscopy, it is shown that the light-activated antibacterial response of the hybrid material against gram-negative Escherichia coli is significantly improved as the oxide functional groups of the GO nanosheets are reduced...
March 7, 2018: Journal of Colloid and Interface Science
María E Alea-Reyes, Oriol Penon, Paula García Calavia, María J Marín, David A Russell, Lluïsa Pérez-García
HYPOTHESIS: Metalloporphyrins are extensively investigated for their ability to form reactive oxygen species and as potent photosensitisers for use in photodynamic therapy. However, their hydrophobicity generally causes solubility issues concerning in vivo delivery due to lack of distribution and low clearance from the body. Immobilising porphyrins on carriers, such as gold nanoparticles (GNP), can overcome some of these drawbacks. The mode of assembling the porphyrins to the carrier influences the properties of the resulting drug delivery systems...
March 7, 2018: Journal of Colloid and Interface Science
Yi Yan, Vitor Sencadas, Tiantian Jin, Xufeng Huang, Wilford Lie, Dongbin Wei, Zhengyi Jiang
Processing conditions deeply affect the mechanical, chemical and biological properties of elastomeric based nanocomposites. In this work, multi-walled carbon nanotubes (MWCNTs) were dispersed in poly(glycerol sebacate) (PGS) prepolymer, followed by curing under vacuum at 120 °C. It was observed an increase of the water contact angle with the amount of MWCNTs added, as well as the tensile strength and Young modulus, without compromising the elastomeric behaviour of the pristine PGS matrix. The cross-linking degree was determined by the Flory-Rehner swelling method and through the mechanical rubber elasticity model, and an increase of more than six-fold was observed, which demonstrates the chemical conjugation between the MWCNTs and the PGS polymer chains, resulting in stiff and elastomeric nanocomposites...
March 7, 2018: Journal of Colloid and Interface Science
Tugce Onur, Esra Yuca, Tolga Tarkan Olmez, Urartu Ozgur Safak Seker
HYPOTHESIS: Amyloid-forming biofilm proteins of Escherichia coli, namely CsgA and CsgB, can form self-assembled nanofibers on solid surfaces. These proteins can be programmed to form bio-nanomaterials for functional applications. EXPERIMENTS: In this study, the assembly of the CsgA and CsgB protein on solid surfaces was investigated in real time using a quartz crystal microbalance instrument with dissipation monitoring. The assembly kinetics of the CsgA and CsgB proteins in various settings on solid surfaces were investigated...
March 7, 2018: Journal of Colloid and Interface Science
Khaoula Lebdioua, Anne Aimable, Manuella Cerbelaud, Arnaud Videcoq, Claire Peyratout
HYPOTHESIS: Pickering emulsions were prepared using wax and silica submicronic particles (650 nm), as a first step towards the synthesis of Janus particles. Surfactants added to silica particles control the emulsion stability and particles arrangement, i.e. their penetration depth into the wax and their ability to form a monolayer. Thus, a systematic study of surfactants is proposed. EXPERIMENTS: Zeta potential measurements and sedimentation tests are conducted to evaluate interactions of two cationic (CTAB: hexadecyltrimethylammonium bromide and DDAB: didodecyldimethylammonium bromide) and two polymeric surfactants with silica surface...
March 7, 2018: Journal of Colloid and Interface Science
Ren-Mian Chin, Shinn-Jen Chang, Chia-Chen Li, Cha-Wen Chang, Ruo-Han Yu
HYPOTHESIS: Finding an efficient dispersant for obtaining a good dispersion of 5-nm detonation nanodiamond (DND) is always a challenge. Two newly designed diblock copolymers, both poly(ammonium methacrylate)-block-poly(2-phenoxyethyl acrylate) (PMA-b-PBEA) but with different molar ratios of PMA to PBEA, were proposed to be efficient dispersants in stabilizing the concentrated aqueous suspensions of DND. EXPERIMENTS: The dispersion efficiency of dispersants for DND in aqueous suspensions was studied by the measurements of particle size, sedimentation property, and rheological behavior...
March 7, 2018: Journal of Colloid and Interface Science
Mehran Abolghasemibizaki, Robert L McMasters, Reza Mohammadi
HYPOTHESIS: Recently, it has been shown that the contact time of impacting water droplets on a superhydrophobic cylindrical surface decreases when its radius becomes comparable to that of the droplet, yet the correlation of this reduction with the impact velocity is unclear. Moreover, on a flat surface, experiments involving the addition of a single macrotexture, along with covering the surface with macroscopic cylindrical ridges (ribbed pattern), have been reported to shorten the contact time...
March 6, 2018: Journal of Colloid and Interface Science
Chao Wang, Zhi-Yi Hu, Heng Zhao, Wenbei Yu, Sijia Wu, Jing Liu, Lihua Chen, Yu Li, Bao-Lian Su
We report three types of conducting polymers (CPs), polyaniline (PANI), polypyrrole (PPY) and poly (3,4-ethylenedioxythiophene) (PEDOT) to modify the surface of the CdS nanorods to probe their photocorrosion inhibition and photocatalytic hydrogen production. Various characterizations, such as high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and density function theory (DFT) calculations have been conducted to reveal the intrinsic structure of the as-constructed CPs@CdS (@ means CPs at the surface of CdS) core-shell nanorods...
March 6, 2018: Journal of Colloid and Interface Science
Divya P Narayanan, Sudha Kochiyil Cherikallinmel, Sugunan Sankaran, Binitha N Narayanan
A one pot synthesis of carbon dot incorporated porous coconut shell char derived sulphonated catalyst is reported here for the first time and is effectively used in the multicomponent synthesis of amidoalkyl naphthol. Macroporous nature of the char is revealed from scanning electron microscopic (SEM) analysis, whereas the dispersion of carbon dots (CDs) on the porous coconut shell char is confirmed from the high resolution transmission electron microscopic (HRTEM) analysis. Fluorescence emission spectrum further confirmed the presence of CDs in the catalyst...
March 6, 2018: Journal of Colloid and Interface Science
Daniel González-Mancebo, Ana I Becerro, T Cristina Rojas, Andrés Olivencia, Ariadna Corral, Marcin Balcerzyk, Eugenio Cantelar, Fernando Cussó, Manuel Ocaña
The singular properties of lanthanide-based inorganic nanoparticles (NPs) has raised the attention of the scientific community in biotechnological applications. In particular, those systems with two or more functionalities are especially interesting. In this work, an effective and commercially attractive procedure has been developed that renders uniform, water-dispersible Ln3+ :CeF3 (Ln = Tb, Nd) NPs with different shapes and size. The method consists of the homogeneous precipitation, in a mixture of polyol and water, of cations and anions using precursors that allow the controlled release of the latter...
March 5, 2018: Journal of Colloid and Interface Science
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