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Journal of Colloid and Interface Science

Feifei Su, Chenyu Liu, Yan Yang, Shulan Ma, Genban Sun, Xiaojing Yang
This work demonstrates tunable and purified luminescence via one-step delamination of HPTS/OS-LRH composites (HPTS is trisodium 8-hydroxy-pyrene-1,3,6-trisulphonate, OS is sodium salt of 1-octane sulfonic acid, LRH is layered rare-earth hydroxide, R=Tb, Y) along with energy transfer. The HPTSxOS1-x-LTbyY1-yH composites presented varied luminescence behavior depending on their physical state. In solid state, dual-color luminescence was observed: blue-dominant emissions (437nm) for HPTSxOS1-x-LTbH, and blue- (437nm) to green-dominant (516nm) luminescence for HPTS0...
February 17, 2017: Journal of Colloid and Interface Science
Keqing Zhou, Rui Gao, Saihua Jiang
In this work, hydroxyapatite (HAP) nanorods decorated on graphene nanosheets (HAP-Gs) was synthesized by a hydrothermal method. The structure, elemental composition and morphology of the HAP-Gs hybrids were characterized by X-ray diffraction, Fourier transform infrared and Transmission electron microscopy. Subsequently, the hybrids were incorporated into poly (ε-caprolactone) (PCL) via a solution blending method. Optical images and scanning electron microscopy observation revealed not only a well dispersion of HAP-Gs hybrids but also a strong interfacial interaction between hybrids and PCL matrix...
February 16, 2017: Journal of Colloid and Interface Science
Xiaoye Yang, Xiaoqing Cai, Aihua Yu, Yanwei Xi, Guangxi Zhai
To remedy the problems riddled in cancer chemotherapy, such as poor solubility, low selectivity, and insufficient intra-cellular release of drugs, novel heparin-based redox-sensitive polymeric nanoparticles were developed. The amphiphilic polymer, heparin-alpha-tocopherol succinate (Hep-cys-TOS) was synthesized by grafting hydrophobic TOS to heparin using cystamine as the redox-sensitive linker, which could self-assemble into nanoparticles in phosphate buffer saline (PBS) with low critical aggregation concentration (CAC) values ranging from 0...
February 16, 2017: Journal of Colloid and Interface Science
Suparna Rudra, Somnath Dasmandal, Ambikesh Mahapatra
The interaction of an amino acid surfactant, sodium-N-dodecanoyl sarcosinate (SDDS), with two heme proteins, hemoglobin (Hb) and myoglobin (Mb), has been studied employing various physicochemical and spectroscopic techniques like tensiometry, UV-Vis spectroscopy, steady-state fluorometry, time-resolved fluorometry, circular dichroism (CD) spectroscopy, calorimetry and stopped flow kinetics at physiological pH of 7.2 and 298K. Tensiometric and fluorometric analysis suggest that the interaction between SDDS and protein starts with the monomer form of the surfactant which produces small induced micelles...
February 16, 2017: Journal of Colloid and Interface Science
Nahir Dib, Ana Lucia Reviglio, Luciana Fernández, Gustavo Morales, Marisa Santo, Luis Otero, Fabrisio Alustiza, Ana Cecilia Liaudat, Pablo Bosch, Marcelo Calderón, Marisa Martinelli, Miriam Strumia
Organic macromolecules with dendrimeric architectures are polymeric materials potentially useful as nanocarriers for therapeutic drugs. In this work, we evaluate a series of Newkome-type dendrons in Langmuir and Langmuir-Blodgett films as platforms capable of interacting with a potential antitumoral agent. The nanocomposite is proposed as model for the development of surface mediated drug delivery systems. We were successful in the formation and characterization of pure (dendrons) and composite (drug-dendron) stable and reproducible monolayers, and their transfer to solid substrates...
February 16, 2017: Journal of Colloid and Interface Science
Qiuxia Zhou, Caixia Xu
Stratified nanoporous PtTi (SNP-PtTi) alloys with bimodal size distributions and different components are successfully prepared by selectively dissolving Al atoms followed by removing part of Ti atoms from the PtTiAl precursor alloy. The as-made PtTi alloys have stratified nanoporous architecture with the first order ligaments around 50nm and the second order smaller ligaments around 6nm. The SNP-PtTi alloys with different bimetallic ratios exhibit much higher catalytic activity for the hydrolysis of ammonia borane than NP-Pt catalyst...
February 16, 2017: Journal of Colloid and Interface Science
Hua Lian, Ying Du, Xin Chen, Lijie Duan, Guanghui Gao, Chunsheng Xiao, Xiuli Zhuang
A kind of core cross-linked poly(ethylene glycol)-graft-Dextran nanoparticles (CPD NPs) was prepared by a simple chemical cross-linking method for reduction and pH dual response drug delivery. The resultant CPD NPs are of homogeneous spherical structure with sizes from 69±11 to 107±18nm. Doxorubicin (DOX) was then loaded into the CPD NPs in high efficiency, and showing typical reduction and pH dual responsive release profiles. The flow cytometric analysis and confocal laser scanning microscopy (CLSM) confirmed that the DOX-loaded CPD NPs could be internalized into cancer cell efficiently and release DOX in intracellular environment...
February 16, 2017: Journal of Colloid and Interface Science
Wojciech Konicki, Małgorzata Aleksandrzak, Dariusz Moszyński, Ewa Mijowska
In the present study, graphene oxide (GO) was used for the adsorption of anionic azo-dyes such as Acid Orange 8 (AO8) and Direct Red 23 (DR23) from aqueous solutions. GO was characterized by Fourier Transform-Infrared Spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS), Thermogravimetric Analysis (TGA), Atomic Force Microscopy (AFM), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), High-Resolution Transmission Electron Microscopy (HRTEM) and zeta potential measurements. The influence of dye initial concentration, temperature and pH on AO8 and DR23 adsorption onto GO was investigated...
February 16, 2017: Journal of Colloid and Interface Science
Mir Ghasem Hosseini, Elham Shahryari
Chitosan/Graphene Oxide-MWCNT/polyaniline (CS/GM/PANI) ternary nanocomposite has been synthesized via in situ polymerization of aniline in the presence of CS/GM. The Morphology of nanocomposites was studied by Field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FT-IR) spectroscopy, as well as X-ray photoelectron spectroscopy (XPS). Futthermore, the supercapacitive behavior of the CS-based samples was investigated using cyclic voltammetry (CV), galvanostatic charge-discharge (CD) and electrochemical impedance spectroscopy (EIS) techniques in 0...
February 14, 2017: Journal of Colloid and Interface Science
Kaustubh A Gawde, Prashant Kesharwani, Samaresh Sau, Fazlul H Sarkar, Subhash Padhye, Sushil K Kashaw, Arun K Iyer
Albumin-bound paclitaxel colloidal nanoparticle (Abraxane®) is an FDA approved anticancer formulation available in the market. It is a suspension which is currently used therapeutically for treating cancers of the breast, lung, and pancreas among others. CDF is a novel new and potent synthetic curcumin analogue that is widely used for breast and ovarian cancer. The aim of this study was to use biocompatible albumin as well as folate decorated albumin to formulate colloidal nanoparticles encapsulating curcumin difluorinated (CDF)...
February 14, 2017: Journal of Colloid and Interface Science
Huiying Li, Honghao Zheng, Weijun Tong, Changyou Gao
Ionic strength-responsive microcapsules with auto-fluorescence were fabricated by incubation of poly(allylamine hydrochloride) (PAH)-doped CaCO3 particles in triethylamine (Et3N), followed by core removal using HCl. Based on the combination of hydrophobic interaction and hydrogen bonding, PAH and Et3N formed a complex with a molar ratio of 3:1 (repeating unit of PAH: Et3N). The as-prepared capsules showed extraordinary stability against 1M HCl, 1M NaOH and 6M urea solutions, and could swell or shrink reversibly in response to the ionic strength...
February 14, 2017: Journal of Colloid and Interface Science
Juan Matos, Silvania Lanfredi, Ricmary Montaña, Marcos A L Nobre, María C Fernández de Córdoba, Conchi O Ania
The photocatalytic activity of a series of novel KSr2Nb5O15 materials was studied using the photooxidation of methylene blue as model reaction. The influence of the calcination time upon the crystalline structure and photoactivity was verified. Characterization was performed by XRD, SEM, FTIR, UV-Vis/DR, Helium picnometry, and N2 and CO2 adsorption-desorption isotherms. The diffraction line profile and the refinement of the structural parameters of KSr2Nb5O15 were obtained from the XRD patterns by the Rietveld method...
February 14, 2017: Journal of Colloid and Interface Science
Wei Zhang, Li Zhou, Jun Shi, Huiping Deng
A visible-light-driven heterostructured AgI/g-C3N4 was prepared by a deposition-precipitation method. The composition, structure, morphology, and optical properties of the photocatalyst were characterized by Brunauer-Emmett-Teller method (BET), X-ray powder diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), scanning electron microscope (SEM), UV-vis diffused reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), photocurrent, and electrochemical impedance spectroscopy (EIS), respectively...
February 14, 2017: Journal of Colloid and Interface Science
Chunsheng Lei, Meng Pi, Panyong Kuang, Yingqing Guo, Fenge Zhang
Hierarchically porous nickel-iron-layered double hydroxide (NiFe-LDH) with a Ni(2+)/Fe(3+) molar ratio of 3 was successfully synthesised through a simple hydrothermal route. After calcination at 400°C, NiFe-LDH transformed into nickel-iron-layered double oxides (NiFe-LDO). The as-prepared samples were characterised through X-ray powder diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and nitrogen adsorption...
February 14, 2017: Journal of Colloid and Interface Science
Hai-Kuan Yang, Ling-Ling Liu, Xin Yuan, Shi-Mei Wu
In this work, we describe how the toluene and DMF addition order influences the gelation behaviors and supramolecular structures of a self-assembled polyoxometalate-cholesterol hybrid. Morphological studies of the dried xerogel samples were performed with transmission electron microscopy and atomic force microscopy, revealing that the order of solvent addition directed the self-assembly of polyoxometalate-cholesterol hybrids toward the formation of organogels with different supramolecular structures. In the case of organogel 1, which was formed by adding DMF dropwise into a hybrid-containing toluene solution, the characteristic organogel morphology contained a three-dimensional fibrous network structure...
February 14, 2017: Journal of Colloid and Interface Science
Fahimeh Bonyasi, Malak Hekmati, Hojat Veisi
An efficient procedure has been proposed for the loading of sulfonic acid groups on the surface of polyethylene glycol 400 (PEG400)-encapsulated Fe3O4 nanoparticles to synthesize a core-shell Fe3O4@PEG400-SO3H nano catalyst. Surface functionalization of magnetic particles in such a way is a refined method of bridging the gap amongst heterogeneous and homogeneous catalysis. The procured nano catalyst was classified through Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), wavelength-dispersive X-ray spectroscopy (WDX), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), BET, and back titration...
February 13, 2017: Journal of Colloid and Interface Science
Teboho Patrick Mokoena, Ella Cebisa Linganiso, Vinod Kumar, Hendrik C Swart, So-Hye Cho, Odireleng Martin Ntwaeaborwa
The sol gel method was used to prepare rare-earths (Yb(3+)-Er(3+) and Yb(3+)-Tm(3+)) co-doped Al2O3-TiO2 nano-composite powder phosphors and their up-conversion luminescence properties were investigated. Mixed oxides of titania (TiO2) rutile phase and an early stage crystallization of alumina (Al2O3) phase were confirmed from the X-ray diffraction data with the average crystallite size of ∼36nm. The rutile phase TiO2 was further confirmed by selected area diffraction analysis of the composites. Microscopy analysis showed interesting rod-like morphologies with rough surfaces indicating that a spherulitic growth process took place during the crystal growth...
February 13, 2017: Journal of Colloid and Interface Science
Gustavo Bonomi Soriano, Roselaine da Silva Oliveira, Fernanda Ferraz Camilo, Luciano Caseli
In this work, silver nanoparticles (AgNPs) dispersed in non-aqueous media and stabilized with polyether block polymers amide (PEBA) were incorporated in Langmuir monolayers of dipalmitoylphosphatidylcholine (DPPC), which served as a cell membrane model. The AgNPs presented surface activity, disturbing the viscoelastic properties of the floating film. They expanded the monolayers decreasing their surface elasticity as observed with surface pressure-area isotherms. Polarization modulation reflection-absorption spectroscopy showed that the permanence of AgNPs at the air-water interface is favored by PEBA, affecting both the hydrophilic and the hydrophobic groups of the phospholipid...
February 13, 2017: Journal of Colloid and Interface Science
Zhijie Liang, Wenxin Shi, Zhiwei Zhao, Tianyi Sun, Fuyi Cui
The spherical mesoporous silica (meso-silica) MCM-41 and those with different dosage of the retained templates were prepared and characterized. Particularly, effects of the retained template and its dosage on the adsorption of typical heavy metals (Cu(2+) and Cd(2+)) in the synthesized materials were investigated. The results indicated that the retained templates acted as "helpers" for the adsorption of Cu(2+) and Cd(2+) in the spherical meso-silica MCM-41, and the maximum adsorption capacities (Qmax) increased with the increase of the retained template dosage...
February 12, 2017: Journal of Colloid and Interface Science
Gurbir Singh, Raman Kamboj, Venus Singh Mithu, Vinay Chauhan, Taranjeet Kaur, Gurcharan Kaur, Sukhprit Singh, Tejwant Singh Kang
New ester-functionalized surface active ionic liquids (SAILs) based on nicotine, [CnENic][Br] (n=8, 10 and 12), with bromide counterions have been synthesized, characterized and investigated for their self-assembly behavior in aqueous medium. Conductivity measurements in aqueous solutions of the investigated SAILs have provided information about their critical micelle concentration (cmc), and degree of counterion binding (β), where cmc was found to be 2-3-fold lower than homologous SAILs or conventional cationic surfactants...
February 12, 2017: Journal of Colloid and Interface Science
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