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Fengjiao Chen, Qishan Zhu, Yeyun Wang, Wei Cui, Xiaodong Su, Yanguang Li
Increasing attention has now been focused on the photoelectrochemical (PEC) hydrogen evolution as a promising route to transform solar energy into chemical fuels. Silicon is one of the most studied PEC electrode materials, but its performance is still limited by its inherent PEC instability and electrochemical inertness toward water splitting. To achieve significant PEC activities, silicon-based photoelectrodes usually have to be coupled with proper cocatalysts, and thus formed semiconductor/cocatalyst interface represents a critical structural parameter in the rational design of efficient PEC devices...
October 21, 2016: ACS Applied Materials & Interfaces
Young S Kang, Frederick Rueggeberg, Van Ramos
STATEMENT OF PROBLEM: Polyvinyl siloxane (PVS) impression materials must be cold disinfected before cast pouring to prevent cross-contamination among personnel and patients. However, disinfection may affect the ability of PVS impression materials to provide bubble-free stone surfaces because of the removal of surfactants. PURPOSE: The purpose of this in vitro study was to compare the water contact angles of a PVS impression material treated with either a quaternary ammonium-based (QAB) (DisCide Ultra) or a chlorine-based (CLB) (Dispatch) disinfectant for various exposure times...
October 17, 2016: Journal of Prosthetic Dentistry
Liang Chen, Cornelis Johannes Kleverlaan, Kunneng Liang, Deqin Yang
STATEMENT OF PROBLEM: Polyvinyl siloxane impression material has been widely used as a lingual matrix for rebuilding missing tooth structure with composite resin. The composite resin is light polymerized in contact with the polyvinyl siloxane impression material. However, polyvinyl siloxane impression material has been shown to interact with other dental materials. PURPOSE: The purpose of this study was to assess the effect of polyvinyl siloxane impression materials on the polymerization of composite resins by assessing the Vickers microhardness and degree of conversion of polyvinyl siloxane...
October 17, 2016: Journal of Prosthetic Dentistry
Joong Kon Park, Mazhar Ul-Islam, Muhammad Wajid Ullah, Shaukat Khan, Tahseen Kamal, Salman Ul-Islam, Nasrullah Shah
BACKGROUND: Cellulose being the most abundant polymer has been widely utilized in multiple applications. Its impressive nanofibril arrangement has provoked its applications in numerous fields. Recent trends have been shifted to produce composites of nanocellulose for numerous applications among which the most important ones are its use in medical and environmental prospective. This review has basically focused the development of nanocellulose composites and its applications in resolving environmental hazards...
October 18, 2016: Recent Patents on Nanotechnology
Xin Xiao, Xue-Feng Cheng, Xiang Hou, Jing-Hui He, Qing-Feng Xu, Hua Li, Na-Jun Li, Dong-Yun Chen, Jian-Mei Lu
An organic thin-film gas sensor based on squaraine detects ammonia as low as 40 ppb with impressive reversibility and stability. The resonance-stabilized zwitterionic characteristics offer squaraines high affinity and sensitivity toward electron-rich analytes without irreversible chemical binding, while the embedded squaric ring makes SA-CH3 highly sensitive. The symmetric molecular geometry and good crystallinity also contribute to the high performance.
October 18, 2016: Small
Thomas Sannicolo, Mélanie Lagrange, Anthony Cabos, Caroline Celle, Jean-Pierre Simonato, Daniel Bellet
Transparent electrodes attract intense attention in many technological fields, including optoelectronic devices, transparent film heaters and electromagnetic applications. New generation transparent electrodes are expected to have three main physical properties: high electrical conductivity, high transparency and mechanical flexibility. The most efficient and widely used transparent conducting material is currently indium tin oxide (ITO). However the scarcity of indium associated with ITO's lack of flexibility and the relatively high manufacturing costs have a prompted search into alternative materials...
October 18, 2016: Small
Hyun-Min Lee, Keun-Ik Yi, Jae-Hoon Jung, Il-Woo Lee
We report an extremely rare case of hearing aid silicone impression material as a foreign body in the middle ear. Symptoms of the patient were otorrhea and vertigo after taking of a mold impression on his only hearing ear, and the symptoms mimicked chronic otitis media. A temporal bone CT scan revealed foreign body material in the middle ear and Eustachian tube. An intact canal wall mastoidectomy with a facial recess approach and type IV tympanoplasty was performed to remove the silicone impression material...
September 28, 2016: American Journal of Otolaryngology
Mieszko Wieckiewicz, Natalia Grychowska, Marek Zietek, Wlodzimierz Wieckiewicz
Background. Addition silicones are popular as dental impression materials and are used in bite registration procedures. Objective. This study aimed to compare the postsetting elasticities and other mechanical properties of thirteen addition silicone interocclusal recording materials. Materials and Methods. The following materials were investigated: Colorbite D, Futar D, Genie Bite, Jet Blue Bite fast, Memoreg 2, O-Bite, Occlufast Rock, Omni-Bite Plus, Regidur i, Registrado X-tra, Regofix transparent, StoneBite, and Variotime Bite...
2016: BioMed Research International
Jihyeon Kim, Ju Won Lim, Filipe Marques Mota, Ji-Eun Lee, Ramireddy Boppella, Keun Yong Lim, Kyungkon Kim, Won Kook Choi, Dong Ha Kim
Transparent conductive electrodes (TCEs) are widely used in a wide range of optical-electronic devices. Recently, metal nanowires (NWs), e.g. Ag and Cu, have drawn attention as promising flexible materials for TCEs. Although the study of core-shell metal NWs, and the encapsulation/overcoating of the surface of single-metal NWs have separately been an object of focus in the literature, herein for the first time we simultaneously applied both strategies in the fabrication of highly stable Ag-Cu NW-based TCEs by the utilization of Ag nanoparticles covered with reduced graphene oxide (rGO)...
October 14, 2016: Nanoscale
Juliana Hotta, Wilson Gustavo Cral, Vinicius Tatsuyuji Sakima, Vanessa Soares Lara, Vanessa Migliorini Urban, Karin Hermana Neppelenbroek
BACKGROUND: Antifungal agents incorporated into temporary denture resilient liners as drug carries and delivery have been suggested as an alternative treatment for denture stomatitis. However, to test the in vivo biocompatibility of this protocol, standardization of an intraoral device for optimal drug delivery is required. OBJECTIVE: Standardized criteria were produced to adjust an acrylic intraoral device (IOD) for rats feasible for denture stomatitis treatment by sustained drug-delivery based on minimal inhibitory drug concentrations (MICs) of antifungals for Candida albicans biofilm...
October 13, 2016: Current Drug Delivery
Xiaowen Chang, Weiping Li, Haining Chen, Liqun Zhu, Huicong Liu, Huifang Geng, Sisi Xiang, Jiaming Liu, Xiaoli Zheng, Ying-Long Yang, Shihe Yang
Carbon-based hole transport materials (HTM)-free perovskite solar cells (PSCs) due to their relatively high stability have attracted intense attention. However, their power conversion efficiency (PCE) is still low, especially for the simplest paintable carbon-based PSCs (C-PSCs), whose performance is greatly limited by the poor contact at perovskite/carbon interface. To enhance interface contact, it is important to fabricate an even-surface perovskite layer in porous scaffold, which is usually unfeasible due to rough crystal precursor...
October 14, 2016: ACS Applied Materials & Interfaces
Stephania Caroline Rodolfo Silva, Aion Mangino Messias, Filipe de Oliveira Abi-Rached, Raphael Freitas de Souza, José Maurício Dos Santos Nunes Reis
This study evaluated the accuracy of gypsum casts after different impression techniques and double pouring. Ten patients were selected and for each one it was obtained 5 partial putty/wash impressions with vinyl polysiloxane (VPS) material from teeth #13 to #16 with partial metal stock trays. The following techniques were performed: (1) one-step; two-step relief with: (2) PVC film; (3) slow-speed tungsten carbide bur and scalpel blade, (4) small movements of the tray and (5) without relief-negative control...
2016: PloS One
Kan Zhan, Rui Su, Sihang Bai, Zhenhua Yu, Nian Cheng, Changlei Wang, Sheng Xu, Wei Liu, Shishang Guo, Xing-Zhong Zhao
The properties of nanomaterials are highly dependent on their size, shape and composition. Compared with zero-dimensional nanoparticles, the increased dimension of a one-dimensional silver nanowire (AgNW/Ag NW) leads to extra challenges on synthesizing it with controllable sizes. Here, a convenient way for the synthesis of AgNWs with tunable sizes has been developed simply by adjusting the amount of salt additives, i.e., ferric chloride (FeCl3), or Fe(NO3)3 & KCl. The average diameter and length of nanowires are readily tailored within 45-220 nm and 10-230 μm, respectively...
October 13, 2016: Nanoscale
Mohammed E Sayed, Mohammed E Sayed, Bandar Ma Al-Makramani, Fuad A Al-Sanabani, Mohamed S Mohamed
AIM: The aim of this study was to evaluate the effect of intermixing brands of addition silicone impression materials on the dimensional accuracy of stone models using two-step putty-wash technique. MATERIALS AND METHODS: Two common brands of addition silicone impression material (Express and Aquasil) were used in this study. A total of 40 impressions of a stainless steel model simulating a three-unit bridge were made, 10 impressions for each group. Accuracy was assessed by measuring two dimensions (inter-abutment and intra-abutment) on stone models obtained from impressions of the stainless steel model...
September 1, 2016: Journal of Contemporary Dental Practice
Yuqi Li, Hui Zhang, Mizi Fan, Jiandong Zhuang, Lihui Chen
Oil-water separation has recently become an important subject due to the increasing incidence of oil spills. Materials with underwater superoleophobic properties have aroused considerable interest due to their cost-effectiveness, environmental friendliness and anti-fouling properties. This paper presents a robust salt-tolerant superoleophobic aerogel inspired by seaweed used without any further chemical modification for oil-seawater separation. The green aerogel is prepared by freeze-drying of sodium alginate (SA)-nanofibrillated cellulose (NFC) using Ca(2+) ions as the crosslinking agent...
September 14, 2016: Physical Chemistry Chemical Physics: PCCP
F Kuhr, A Schmidt, P Rehmann, B Wöstmann
OBJECTIVE: To evaluate a new method of measuring the real deviation (trueness) of full arch impressions intraorally and to investigate the trueness of digital full arch impressions in comparison to a conventional impression procedure in clinical use. METHODS: Four metal spheres were fixed with composite using a metal application aid to the lower teeth of 50 test subjects as reference structures. One conventional impression (Impregum Penta Soft) with subsequent type-IV gypsum model casting (CI) and three different digital impressions were performed in the lower jaw of each test person with the following intraoral scanners: Sirona CEREC Omnicam (OC), 3M True Definition (TD), Heraeus Cara TRIOS (cT)...
October 4, 2016: Journal of Dentistry
Chayanika Das, Kothandam Krishnamoorthy
Flexible micro-supercapacitors are needed to power ultra-small wearable electronic devices. Silk cocoons comprise microfibers of silk, which are an attractive natural resource to fabricate micro-supercapacitors (MSCs). These fibers are insulators, hence, they must be converted to conducting surfaces. Polyphenols from green tea have been used as a protective layer that also acted as a reducing agent to silver ion. The reduction of silver ion resulted in the formation of silver nanoparticles that subsequently reduced gold ions to gold...
October 7, 2016: ACS Applied Materials & Interfaces
Christoph Schlaich, Luis Cuellar Camacho, Leixiao Yu, Katharina Achazi, Qiang Wei, Rainer Haag
Facile approaches for the fabrication of substrate independent superamphiphobic surfaces that can repel both water and organic liquids have been limited. The design of such super-repellent surfaces is still a major challenge of surface chemistry and physics. Herein, we describe a simple and efficient dip coating approach for the fabrication of highly hierarchical surface coatings with superamphiphobic properties for a broad range of materials based on a mussel inspired dendritic polymer (MI-dPG). The MI-dPG coating process provides a precise roughness control and the construction of highly hierarchical structures was achieved either directly by pH controlled aggregation or in combination with nanoparticles (NP)...
October 7, 2016: ACS Applied Materials & Interfaces
Kai Xu, Lei Yin, Yun Huang, Tofik Ahmed Shifa, Junwei Chu, Feng Wang, Ruiqing Cheng, Zhenxing Wang, Jun He
Group III-VI compounds M(III)X(VI) (M = Ga, In; X = S, Se, Te) are one class of important 2D layered materials and are currently attracting increasing interest due to their unique electronic and optoelectronic properties and their great potential applications in various other fields. Similar to 2D layered transition metal dichalcogenides (TMDs), M(III)X(VI) also have the significant merits of ultrathin thickness, ultrahigh surface-to-volume ratio, and high compatibility with flexible devices. More impressively, in contrast with TMDCs, M(III)X(VI) demonstrate many superior properties, such as direct band gap electronic structure, high carrier mobility, rare p-type electronic behaviors, high charge density, and so on...
September 29, 2016: Nanoscale
Sijing Yi, Meihuan Yao, Jiao Wang, Xiao Chen
Soft lanthanide luminescent materials are impressive because of their tunable and self-assembling characteristics, which make them an attractive emerging materials field of research. In this report, novel luminescent lyotropic liquid crystals (LLCs) with four different mesophases have been fabricated by a protic ionic liquid (IL) based europium β-diketonate complex EA[Eu(TTA)4] (EA = ethylammonium, TTA = 2-thenoyltrifluoro-acetone) and an amphiphilic block copolymer (Pluronic P123). The protic IL, ethylammonium nitrate (EAN), was used as both the solvent and linkage to stabilize the doped complexes...
October 5, 2016: Physical Chemistry Chemical Physics: PCCP
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