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Fudong Wang, William E Buhro
Crystal-phase control is one of the most challenging problems in nanowire growth. We demonstrate that, in the solution-phase catalyzed growth of colloidal cadmium telluride (CdTe) quantum wires (QWs), the crystal phase can be controlled by manipulating the reaction chemistry of the Cd precursors and tri-n-octylphosphine telluride (TOPTe) to favor the production of either a CdTe solute or Te, which consequently determines the composition and (liquid or solid) state of the Bix Cdy Tez catalyst nanoparticles. Growth of single-phase (e...
December 26, 2017: ACS Nano
Yinyin Qian, Qing Yang
Indium antimonide (InSb) enables diverse applications in electronics and optoelectronics. However, to date, there has not been a report on the synthesis of InSb nanowires (NWs) via a solution-phase strategy. Here, we demonstrate for the first time the preparation of high-quality InSb NWs with twinning superlattices from a mild solution-phase synthetic environment from the reaction of commercial triphenylantimony with tris(2,4-pentanedionato)-indium(III). This reaction occurs at low temperatures from 165 to 195 °C (optimized at ∼180 °C), which is the lowest temperature reported for the growth of InSb NWs to date...
November 14, 2017: Nano Letters
Kobi Flomin, Mahmud Diab, Taleb Mokari
Multi-component nanostructures of Au-CdS-ZnO with a novel morphology were synthesized by a non-conventional strategy where seeded growth is combined with solution-liquid-solid (SLS) growth. Each of these synthetic routes is used for growing a different domain of the final heterostructure, where ZnO rods are grown first on Au nanoparticles via heterogeneous nucleation while CdS is later grown between these two domains via SLS, using the Au tip of the preformed Au-ZnO as a catalyst. The in situ alloying of the Au tip with Cd enabled the metal tip to function as an SLS catalyst at a relatively mild reaction temperature which is lower than the melting point of pure Au...
November 2, 2017: Nanoscale
Bratindranath Mukherjee, Swagotom Sarker, Eric Crone, Pawan Pathak, Vaidyanathan R Subramanian
This work presents a hitherto unreported approach to assemble a 1D oxide-1D chalcogenide heterostructured photoactive film. As a representative system, bismuth (Bi) catalyzed 1D CdSe nanowires are directly grown on anodized 1D TiO2 nanotube (T_NT). A combination of the reductive successive-ionic-layer-adsorption-reaction (R-SILAR) and the solution-liquid-solid (S-L-S) approach is implemented to fabricate this heterostructured assembly, reported in this 1D/1D form for the first time. XRD, SEM, HRTEM, and elemental mapping are performed to systematically characterize the deposition of bismuth on T_NT and the growth of CdSe nanowires leading to the evolution of the 1D/1D heterostructure...
December 7, 2016: ACS Applied Materials & Interfaces
Wenhao Xu, Jingbo Yu, Wen Feng, Weike Su
A novel method for the selective extraction of gardenia yellow and geniposide from Gardenia Jasminoides, based on a mechanochemical method is described. Without the need of complex separation techniques, gardenia yellow compliant with the national standard could be extracted in a simple fashion. The optimal ball-milling conditions determined were as follows: 30% g/g. active carbon milling at 200 rpm in a planetary mill for 5 min. The extraction conditions of the milled mixtures were as follows: the milled mixtures were extracted with water (liquid-solid ratio 10:1) at 20 °C for 5 min with yields 85% of total geniposide, followed by extraction with 80% ethanol solution (liquid-solid ratio 5:1) and 1% g/g...
April 28, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Fudong Wang, Angang Dong, William E Buhro
The solution-liquid-solid (SLS) and related solution-based methods for the synthesis of semiconductor nanowires and nanorods are reviewed. Since its discovery in 1995, the SLS mechanism and its close variants have provided a nearly general strategy for the growth of pseudo-one-dimensional nanocrystals. The various metallic-catalyst nanoparticles employed are summarized, as are the syntheses of III-V, II-VI, IV-VI, group IV, ternary, and other nanorods and nanowires. The formation of axial heterojunctions, core/shell nanowires, and doping are also described...
September 28, 2016: Chemical Reviews
Erik J Sheets, Robert B Balow, Wei-Chang Yang, Eric A Stach, Rakesh Agrawal
The solution-based synthesis of nanoscale earth-abundant semiconductors has the potential to unlock simple, scalable, and tunable material processes which currently constrain development of novel compounds for alternative energy devices. One such promising semiconductor is zinc tin phosphide (ZnSnP2). We report the synthesis of ZnSnP2 nanowires via a solution-liquid-solid mechanism utilizing metallic zinc and tin in decomposing trioctylphosphine (TOP). Dried films of the reaction product are purified of binary phosphide phases by annealing at 345 °C...
December 7, 2015: Nanoscale
You Zhai, Moonsub Shim
Cu2 S/ZnS heterostructured nanorods (HNRs) with uncommon morphologies are achieved through single-pot and multi-batch synthetic strategies. In both cases, Cu2 S NRs form first, which then undergo partial cation exchange and solution-liquid-solid (SLS)-like growth catalyzed by the remaining Cu2 S parts of the NRs. The location and the volume of ZnS achieved through partial cation exchange control the size of the Cu2 S catalysts, which in turn determine whether tapered rod-rod, body/tail, or barbell-like structure results from subsequent SLS-like growth...
March 3, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Lili Xu, Minghua Zhong, Xiaojing Chen
A eugenol-bonded silica gel stationary phase (EGSP) for high performance liquid chromatography ( HPLC) has been synthesized by the solid-liquid successive reaction method. The preparation process included two steps: firstly, γ-glycidoxypropyltrimethoxy-silane (KH-560) was covalently attached to the surface of spherical silica gel. Then the bonded silica gel continued to react with eugenol ligand, which was a plant active component, and obtained EGSP. The structure of EGSP was characterized by elemental analysis, thermogravimetric analysis and Fourier transform infrared spectroscopy...
May 2015: Se Pu, Chinese Journal of Chromatography
Xia Xu, Zhuo Wang, Pengpeng Lei, Xiuling Liu, Yue Su, Lile Dong, Shuang Yao, Liang Zhou, Shuyan Song, Jing Feng, Hongjie Zhang
Cubic KLu3F10 nanocrystals have been fabricated by doping Mn(2+) ions via a liquid-solid solution (LSS) hydrothermal method. With an increase in the Mn(2+) level, a phase transformation from orthorhombic KLu2F7 to cubic KLu3F10 associated with evolution of the particle morphologies and sizes is evident. The phase transformation mechanism based on doping with Mn(2+) ions was studied via a series of time-controlled experiments and the enhancement of the intensity of upconversion luminescence (UCL) via doping with Mn(2+) ions is discussed in detail...
October 21, 2015: Dalton Transactions: An International Journal of Inorganic Chemistry
Ali Mazloomi M, Shyam S Chikatamarla, Iliya V Karlin
The recently introduced entropic lattice Boltzmann model (ELBM) for multiphase flows [A. Mazloomi M., S. S. Chikatamarla, and I. V. Karlin, Phys. Rev. Lett. 114, 174502 (2015)] is extended to the simulation of dynamic fluid-solid interface problems. The thermodynamically consistent, nonlinearly stable ELBM together with a polynomial representation of the equation of state enables us to investigate the dynamics of the contact line in a wide range of applications, from capillary filling to liquid drop impact onto a flat surfaces with different wettability...
August 2015: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
David W Rees Jones, Andrew J Wells
The physics of ice crystal growth from the liquid phase, especially in the presence of salt, has received much less attention than the growth of snow crystals from the vapor phase. The growth of so-called frazil ice by solidification of a supercooled aqueous salt solution is consistent with crystal growth in the basal plane being limited by the diffusive removal of the latent heat of solidification from the solid-liquid interface, while being limited by attachment kinetics in the perpendicular direction. This leads to the formation of approximately disk-shaped crystals with a low aspect ratio of thickness compared to radius, because radial growth is much faster than axial growth...
August 2015: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Harsha S Fowdar, Belinda E Hatt, Peter Breen, Perran L M Cook, Ana Deletic
An external electron donor is usually included in wastewater and groundwater treatment systems to enhance nitrate removal through denitrification. The choice of electron donor is critical for both satisfactory denitrification rates and sustainable long-term performance. Electron donors that are waste products are preferred to pure organic chemicals. Different electron donors have been used to treat different water types and little is known as to whether there are any electron donors that are suitable for multiple applications...
November 15, 2015: Water Research
Lykourgos Bougas, Dimitris Sofikitis, Georgios E Katsoprinakis, Alexandros K Spiliotis, Paraskevas Tzallas, Benoit Loppinet, T Peter Rakitzis
We present the theory and experimental details for chiral-cavity-ring-down polarimetry and magnetometry, based on ring cavities supporting counterpropagating laser beams. The optical-rotation symmetry is broken by the presence of both chiral and Faraday birefringence, giving rise to signal reversals which allow rapid background subtractions. We present the measurement of the specific rotation at 800 nm of vapors of α-pinene, 2-butanol, and α-phellandrene, the measurement of optical rotation of sucrose solutions in a flow cell, the measurement of the Verdet constant of fused silica, and measurements and theoretical treatment of evanescent-wave optical rotation at a prism surface...
September 14, 2015: Journal of Chemical Physics
Matthew R Hermes, So Hirata
One-dimensional (1D) solids exhibit a number of striking electronic structures including charge-density wave (CDW) and spin-density wave (SDW). Also, the Peierls theorem states that at zero temperature, a 1D system predicted by simple band theory to be a metal will spontaneously dimerize and open a finite fundamental bandgap, while at higher temperatures, it will assume the equidistant geometry with zero bandgap (a Peierls transition). We computationally study these unique electronic structures and transition in polyyne and all-trans polyacetylene using finite-temperature generalizations of ab initio spin-unrestricted Hartree-Fock (UHF) and spin-restricted coupled-cluster doubles (CCD) theories, extending upon previous work [He et al...
September 14, 2015: Journal of Chemical Physics
Hyounguk Jang, T Joshua Pfefer, Yu Chen
Stable tissue phantoms that incorporate the spectral absorption properties of hemoglobin would benefit a wide range of biophotonic technologies. Toward this end, we have developed and validated a novel polymer material incorporating hemoglobin. Our solid hemoglobin-polymer (SHP) material is fabricated by mixing liquid silicone base with a hemoglobin solution, followed by sonication and low temperature curing. The optical properties of samples were determined over 450-1000 nm using the inverse adding-doubling method and the Beer-Lambert law...
September 15, 2015: Optics Letters
Ming Shen, Yuan-Yuan Xu, Ying Sun, Bao-Shan Han, You-Rong Duan
It is hypothesized that a gel (NP-Gel) composed of thermosensitive gel (Gel) and nanoparticles (NP) can prolong drug release time and overcome the drug resistance of pancreatic tumor cells. Paclitaxel (PTX)-loaded monomethoxy (polyethylene glycol)-poly(d,l-lactide-co-glycolide)-poly(l-lysine)-cyclic peptide (arginine-glycine-aspartic-glutamic-valine acid) (mPEG-PLGA-PLL-cRGD) NP and NP-Gel were designed, optimized, and characterized using dynamic light scattering, transmission electron microscopy, high efficiency liquid chromatography, and rheological analyses...
September 23, 2015: ACS Applied Materials & Interfaces
Benjamin Maiser, Kai Baumgartner, Florian Dismer, Jürgen Hubbuch
The combination of PEG-protein conjugation and chromatographic separation is generally known as solid-phase or on-column PEGylation and can provide advantages compared to commonly applied batch PEGylation. Even though the concept was already applied by several authors, changes in the isoform distribution compared to liquid-phase PEGylation due to sterically hindered PEGylation sites could not be confirmed. In this manuscript, a method for solid-phase PEGylation experiments in a 96-well plate format, using an automated liquid handling station is described...
October 1, 2015: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Tahnee J Dening, Shasha Rao, Nicky Thomas, Clive A Prestidge
Lipid-based drug delivery systems (LBDDS) have gained significant attention in recent times, owing to their ability to overcome the challenges limiting the oral delivery of poorly water-soluble drugs. Despite the successful commercialization of several LBDDS products over the years, a large discrepancy exists between the number of poorly water-soluble drugs displaying suboptimal in vivo performances and the application of LBDDS to mitigate their various delivery challenges. Conventional LBDDS, including lipid solutions and suspensions, emulsions, and self-emulsifying formulations, suffer from various drawbacks limiting their widespread use and commercialization...
January 2016: AAPS Journal
Huidong Qiu, Dongdi Sun, Sameera R Gunatilake, Jinyan She, Todd E Mlsna
An improved method for trace level quantification of dicyandiamide in stream water has been developed. This method includes sample pretreatment using solid phase extraction. The extraction procedure (including loading, washing, and eluting) used a flow rate of 1.0mL/min, and dicyandiamide was eluted with 20mL of a methanol/acetonitrile mixture (V/V=2:3), followed by pre-concentration using nitrogen evaporation and analysis with high performance liquid chromatography-ultraviolet spectroscopy (HPLC-UV). Sample extraction was carried out using a Waters Sep-Pak AC-2 Cartridge (with activated carbon)...
September 1, 2015: Journal of Environmental Sciences (China)
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