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Synthetic colloid

Enrico Della Gaspera, Enrico Menin, Gianluigi Maggioni, Cinzia Sada, Alessandro Martucci
Sub-monolayers of monodisperse Au colloids with different surface coverage have been embedded in between two different metal oxide thin films, combining sol-gel depositions and proper substrates functionalization processes. The synthetized films were TiO₂, ZnO, and NiO. X-ray diffraction shows the crystallinity of all the oxides and verifies the nominal surface coverage of Au colloids. The surface plasmon resonance (SPR) of the metal nanoparticles is affected by both bottom and top oxides: in fact, the SPR peak of Au that is sandwiched between two different oxides is centered between the SPR frequencies of Au sub-monolayers covered with only one oxide, suggesting that Au colloids effectively lay in between the two oxide layers...
March 14, 2018: Materials
Lorenzo Degli Esposti, Francesca Carella, Alessio Adamiano, Anna Tampieri, Michele Iafisco
Synthetic calcium phosphates (CaPs) are the most widely accepted bioceramics for the repair and reconstruction of bone tissue defects. The recent advancements in materials science have prompted a rapid progress in the preparation of CaPs with nanometric dimensions, tailored surface characteristics, and colloidal stability opening new perspectives in their use for applications not strictly related to bone. In particular, the employment of CaPs nanoparticles as carriers of therapeutic and imaging agents has recently raised great interest in nanomedicine...
March 12, 2018: Drug Development and Industrial Pharmacy
P J Featherstone, C M Ball
No abstract text is available yet for this article.
March 2018: Anaesthesia and Intensive Care
Banani Kundu, Mohamed R Eltohamy, Vamsi K Yadavalli, Rui Luis Reis, Hae-Won Kim
The assembly of natural proteinaceous biopolymers into macro-scale architectures is of great importance in synthetic biology, soft-material science and regenerative therapy. The self-assembly of protein tends to be limited due to anisotropic interactions among protein molecules, poor solubility and stability. Here, we introduce a unique platform to self-immobilize diverse proteins (fibrous and globular, positively and negatively charged, low and high molecular weight) using silicon surfaces with pendant -NH2 groups via a facile one step diffusion limited aggregation (DLA) method...
February 28, 2018: Biomedical Materials
Kate Hopper, Alejandro Garcia Rojas, Linda Barter
OBJECTIVE To determine common fluid therapy practices of small animal practitioners and identify fluid therapy-related knowledge gaps that may benefit from improved educational efforts, targeted research, or both. DESIGN Online survey. SAMPLE 1,496 small animal veterinarians PROCEDURES An online survey was provided to members of the Veterinary Information Network between December 23, 2013, and January 30, 2014. The survey consisted of 24 questions investigating the administration of crystalloid and synthetic colloid solutions, but not blood products, and focused primarily on the choice of fluid type, frequency of administration, type of patient treated with fluids, treatment with fluids subcutaneously versus IV, and potassium supplementation of fluids...
March 1, 2018: Journal of the American Veterinary Medical Association
Tae Yoon Kim, Youmie Park
Tannic acid is a phenolic compound that is abundant in plants. Five different concentrations of tannic acid were used as a reducing agent to synthesize gold nanoparticles (AuNPs). Three kinds of AuNPs were prepared to evaluate their catalytic activity for the 4-nitrophenol reduction reaction in the presence of sodium borohydride: (i) Colloidal solutions of AuNPs synthesized using tannic acid as a reducing agent (TA-AuNPs), (ii) Nanoparticles made by centrifuging the colloidal solution of TA-AuNPs followed by re-dispersion with deionized water (cf-TA-AuNPs), and (iii) Nanoparticles made by the in situ crystallization of TA-AuNPs on graphene oxide (TA-AuNPs-GO)...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Zhenxing Wang, Bowen He, Gefei Xu, Guojing Wang, Jiayi Wang, Yuhua Feng, Dongmeng Su, Bo Chen, Hai Li, Zhonghua Wu, Hua Zhang, Lu Shao, Hongyu Chen
Synthetic skills are the prerequisite and foundation for the modern chemical and pharmaceutical industry. The same is true for nanotechnology, whose development has been hindered by the sluggish advance of its synthetic toolbox, i.e., the emerging field of nanosynthesis. Unlike organic chemistry, where the variety of functional groups provides numerous handles for designing chemical selectivity, colloidal particles have only facets and ligands. Such handles are similar in reactivity to each other, limited in type, symmetrically positioned, and difficult to control...
February 8, 2018: Nature Communications
Jakob M Townsend, Taylor A Zabel, Yi Feng, Jinxi Wang, Brian T Andrews, Randy Nudo, Cory Berkland, Michael S Detamore
In the treatment of severe traumatic brain injury (TBI), decompressive craniectomy is commonly used to remove a large portion of calvarial bone to allow unimpeded brain swelling. Hydrogels have the potential to revolutionize TBI treatment by permitting a single-surgical intervention, remaining pliable during brain swelling, and tuned to regenerate bone after swelling has subsided. With this motivation, our goal is to present a pliable material capable of regenerating calvarial bone across a critical size defect...
February 7, 2018: Biomedical Materials
Ankit Agrawal, Shin Hum Cho, Omid Zandi, Sandeep Ghosh, Robert W Johns, Delia J Milliron
Localized surface plasmon resonance (LSPR) in semiconductor nanocrystals (NCs) that results in resonant absorption, scattering, and near field enhancement around the NC can be tuned across a wide optical spectral range from visible to far-infrared by synthetically varying doping level, and post synthetically via chemical oxidation and reduction, photochemical control, and electrochemical control. In this review, we will discuss the fundamental electromagnetic dynamics governing light matter interaction in plasmonic semiconductor NCs and the realization of various distinctive physical properties made possible by the advancement of colloidal synthesis routes to such NCs...
February 5, 2018: Chemical Reviews
Sidney E Creutz, Evan N Crites, Michael C De Siena, Daniel R Gamelin
Concerns about the toxicity and instability of lead-halide perovskites has driven a recent surge in research toward alternative lead-free perovskite materials, including lead-free double perovskites with the elpasolite structure and visible bandgaps. Synthetic approaches to this class of materials remain limited, however, and no examples of heterometallic elpasolites as nanomaterials have been reported. Here, we report the synthesis and characterization of colloidal nanocrystals of Cs2AgBiX6 (X = Cl, Br) elpasolites using a hot-injection approach...
January 27, 2018: Nano Letters
Gili Bisker, Naveed Ali Bakh, Michael A Lee, Jiyoung Ahn, Minkyung Park, Ellen B O'Connell, Nicole Iverson, Michael S Strano
Corona Phase Molecular Recognition (CoPhMoRe) is a technique whereby an external, adsorbed phase around a colloidal nanoparticle is selected such that its molecular conformation or interaction recognizes a specific target analyte. In this work, we employ a high-throughput screening of a library of poly(ethylene glycol) (PEG)-conjugated lipids adsorbed onto near-infrared fluorescent single-walled carbon nanotubes to discover a corona phase selective for insulin. We find that a C16-PEG(2000kDa)-Ceramide causes a 62% fluorescent intensity decrease of the (10,2) chirality nanotube in 20 µg/ml insulin concentration...
January 23, 2018: ACS Sensors
Isabel Abánades Lázaro, Salame Haddad, José Rodrigo-Muñoz, Claudia Orellana-Tavra, Victoria Del Pozo, David Fairen-Jimenez, Ross S Forgan
The high drug loading and excellent biocompatibilities of metal-organic frameworks (MOFs) have led to their application as drug delivery systems (DDSs). Nanoparticle surface chemistry dominates both biostability and dispersion of DDSs while governing their interactions with biological systems, cellular and/or tissue targeting, and cellular internalisation, leading to a requirement for versatile and reproducible surface functionalisation protocols. Herein, we explore not only the effect of introducing different surface functionality to the biocompatible Zr-MOF UiO-66, but also the efficacy of three surface modification protocols: (i) direct attachment of biomolecules (folic acid, biotin) introduced as modulators of UiO-66 synthetic, (ii) our previously reported ''click-modulation" approach to covalently attach polymers (poly(ethylene glycol), poly-L-lactide, poly-N-isopropylacrylamide) to the surface of UiO-66 through click chemistry, and (iii) surface ligand exchange, to postsynthetically coordinate folic acid, biotin and heparin to UiO-66...
January 22, 2018: ACS Applied Materials & Interfaces
Xiaoyan Zhang, You Xu, Junjie Zhang, Shuai Dong, Liming Shen, Arunava Gupta, Ningzhong Bao
Two-dimensional (2D) semiconducting nanomaterials have generated much interest both because of fundamental scientific interest and technological applications arising from the unique properties in two dimensions. However, the colloidal synthesis of 2D quaternary chalcogenide nanomaterials remains a great challenge owing to the lack of intrinsic driving force for its anisotropic growth. 2D wurtzite Cu2ZnSnS4 nanosheets (CZTS-NS) with high-energy (002) facets have been obtained for the first time via a simple one-pot thermal decomposition method...
January 10, 2018: Scientific Reports
Amal Krishna Saha, Alok Sinha, Srinivas Pasupuleti
Enhancement of nZVI stability and transport in the sub-surface environment is important for in situ degradation of contaminants. Various biodegradable dispersants (PAA, Tween20 and Reetha Extracts) have been tested to evaluate their effectiveness in this regard. Application of dispersants during synthesis of nZVI have positively affected the reduction in particle size. The transport capacity in terms of fraction elution at different pore water velocities and collector grain size (filter media), were analyzed using correlation equation for filtration model by Rajagopalan and Tien (RT model)...
January 10, 2018: Environmental Technology
U E Kongsgaard, A Holtan, A Perner
BACKGROUND: Administration of resuscitation fluid is a common intervention in the treatment of critically ill patients, but the right choice of fluid is still a matter of debate. Changes in medical practice are based on new evidence and guidelines as well as traditions and personal preferences. Official warnings against the use of hydroxyl-ethyl-starch (HES) solutions have been issued. Nordic guidelines have issued several strong recommendations favouring crystalloids over colloids in all patient groups...
January 7, 2018: Acta Anaesthesiologica Scandinavica
Adeyemi S Adeleye, Suman Pokhrel, Lutz Mädler, Arturo A Keller
Engineered nanoparticles (NPs) are often doped with other elements to improve their functionality and, at times, physical and/or chemical stability. However, the effect of doping on the environmental implications of NPs is not well-understood. We investigated the colloidal stability and effects of CuO NPs doped with Fe (0-10%). Colloidal stability of the Fe-doped CuO NPs in aqueous media, as determined by critical coagulation concentrations of NaCl, decreased with increased Fe-doping. However, decrease in the overall particle density led to slower sedimentation of Fe-doped CuO NPs than would have been predicted from their aggregation behavior...
December 28, 2017: Water Research
Yingfei Wang, Fengliang Wang, Yiping Feng, Zhijie Xie, Qianxin Zhang, Xiaoyu Jin, Haijin Liu, Yang Liu, Wenying Lv, Guoguang Liu
The development of facile and efficient synthetic approaches of carbon quantum dots loaded with mesoporous g-C3N4 (mpg-C3N4/CQDs) is of critical urgency. Here, a facile strategy was developed to synthesize the mpg-C3N4/CQDs by using calcinations of the mixture of CQDs, cyanamide, and silica colloid. The obtained composite still retained a considerable total surface area, which could offer a larger population of adsorption sites; therefore enhance the capacity for the adsorption of fluoroquinolones antibiotics (FQs)...
January 4, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Kemar R Reid, James R McBride, Nathaniel J Freymeyer, Lucas B Thal, Sandra J Rosenthal
Thick-shell (> 5 nm) InP-ZnSe colloidal quantum dots (QDs) grown by a continuous-injection shell growth process are reported. The growth of a thick crystalline shell is attributed to the high temperature of the growth process and the relatively low lattice mismatch between the InP core and ZnSe shell. In addition to a narrow ensemble photoluminescence (PL) line-width (~ 40 nm), ensemble and single particle emission dynamics measurements indicate that blinking and Auger recombination are reduced in these heterostructures...
December 28, 2017: Nano Letters
Gang Chen, Kaikai Wang, Yixin Wang, Pengkai Wu, Minjie Sun, David Oupický
The use of small interfering RNA (siRNA) in cancer treatment has been limited by the lack of effective systemic delivery methods. Although synthetic polycations have been widely explored in siRNA delivery, polycation/siRNA polyplexes often suffer from insufficient stability in vivo. Here, rationally designed siRNA delivery systems that meet the requirements for systemic siRNA delivery to distant tumors are reported. The hypothesis that modular design of delivery systems based on poly(amido amine)s that combine fluorination for systemic stability with bioreducibility for easy intracellular siRNA release, and PEGylation for improved safety and colloidal stability will overcome problems with contradicting siRNA delivery demands is tested...
December 27, 2017: Advanced Healthcare Materials
Kefyalew Dagnew Addisu, Balkew Zewge Hailemeskel, Shewaye Lakew Mekuria, Abegaz Tizazu Andrgie, Yu-Chun Lin, Hsieh-Chih Tsai
Manganese-based nanomaterials are an emerging new class of magnetic resonance imaging (MRI) contrast agents (CAs) that provide impressive contrast abilities. MRI CAs that can respond to pathophysiological parameters like pH or redox potential are also highly demanded for MRI guided tumor diagnosis. Until now, synthesizing nanomaterials with good biocompatibility, physio-chemical stability, and good contrast effects remain challenging. This study investigated two new systems of calcium/manganese cations complexed with either alginate-polydopamine or alginate-dopamine nanogels (AlgPDA(Ca/Mn) NG or AlgDA (Ca/Mn) NG)...
December 26, 2017: ACS Applied Materials & Interfaces
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