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Author Araya-Letelier, G.; Antico, F.C.; Carrasco, M.; Rojas, P.; Garcia-Herrera, C.M. pdf  doi
openurl 
  Title Effectiveness of new natural fibers on damage-mechanical performance of mortar Type Journal Article
  Year 2017 Publication Construction And Building Materials Abbreviated Journal Constr. Build. Mater.  
  Volume 152 Issue Pages 672-682  
  Keywords Animal fiber; Fiber-reinforced mortar; Mechanical properties; Damage mitigation  
  Abstract Addition of fibers to cement-based materials improve tensile and flexural strength, fracture toughness, abrasion resistance, delay cracking, and reduce crack widths. Natural fibers have recently become more popular in the construction materials community. This investigation addresses the characterization of a new animal fiber (pig hair), a massive food-industry waste worldwide, and its use in mortars. Morphological, physical and mechanical properties of pig hair are determined in order to be used as reinforcement in mortars. A sensitivity analysis on the volumes of fiber in mortars is developed. The results from this investigation showed that reinforced mortars significantly improve impact strength, abrasion resistance, plastic shrinkage cracking, age at cracking, and crack widths as fiber volume increases. Other properties such as compressive and flexural strength, density, porosity and modulus of elasticity of reinforced mortars are not significantly affected by the addition of pig hair. (C) 2017 Elsevier Ltd. All rights reserved.  
  Address [Araya-Letelier, G.; Carrasco, M.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Ave Diagonal Las Torres 2640, Santiago 7941169, Chile, Email: gerardo.araya@uai.cl;  
  Corporate Author Thesis  
  Publisher Elsevier Sci Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0950-0618 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000411545600062 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 803  
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Author Araya-Letelier, G.; Concha-Riedel, J.; Antico, F.C.; Valdes, C.; Caceres, G. pdf  doi
openurl 
  Title Influence of natural fiber dosage and length on adobe mixes damage-mechanical behavior Type Journal Article
  Year 2018 Publication Construction And Building Materials Abbreviated Journal Constr. Build. Mater.  
  Volume 174 Issue Pages 645-655  
  Keywords Adobe mixes; Animal fiber; Mechanical properties; Damage control; Fiber-reinforced  
  Abstract This study addresses the use of a natural fiber (pig hair), a massive food-industry waste, as reinforcement in adobe mixes (a specific type of earthen material). The relevance of this work resides in the fact that earthen materials are still widely used worldwide because of their low cost, availability, and low environmental impact. Results show that adobe mixes' mechanical-damage behavior is sensitive to both (i) fiber dosage and (ii) fiber length. Impact strength and flexural toughness are increased, whereas shrinkage distributed crack width is reduced. Average values of compressive and flexural strengths are reduced as fiber dosage and length increase, as a result of porosity generated by fiber clustering. Based on the results of this work a dosage of 0.5% by weight of dry soil using 7 mm fibers is optimal to improve crack control, flexural toughness and impact strength without statistically affecting flexural and compressive strengths. (C) 2018 Elsevier Ltd. All rights reserved.  
  Address [Araya-Letelier, G.] Pontificia Univ Catolica Chile, Fac Ingn, Escuela Construcc Civil, Ave Vicuna Mackenna 4860, Santiago 7820436, Chile, Email: gerardo.araya@uc.cl;  
  Corporate Author Thesis  
  Publisher Elsevier Sci Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0950-0618 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000433656300061 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 873  
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Author Collins, C.J.; Vivanco, J.F.; Sokn, S.A.; Williams, B.O.; Burgers, T.A.; Ploeg, H.L. pdf  doi
openurl 
  Title Fracture healing in mice lacking Pten in osteoblasts: a micro-computed tomography image-based analysis of the mechanical properties of the femur Type Journal Article
  Year 2015 Publication Journal Of Biomechanics Abbreviated Journal J. Biomech.  
  Volume 48 Issue 2 Pages 310-317  
  Keywords Fracture healing; Mouse femur; Pten gene; Micro computed tomography image-based analysis; Section properties; Mechanical properties; Four-point bend testing  
  Abstract In the United States, approximately eight million osseous fractures are reported annually, of which 5-10% fail to create a bony union. Osteoblast-specific deletion of the gene Pten in mice has been found to stimulate bone growth and accelerate fracture healing. Healing rates at four weeks increased in femurs from Pten osteoblast conditional knock-out mice (Pten-CKO) compared to wild-type mice (WT) of the same genetic strain as measured by an increase in mechanical stiffness and failure load in four-point bending tests. Preceding mechanical testing, each femur was imaged using a Skyscan 1172 micro-computed tomography (mu CT) scanner (Skyscan, Kontich, Belgium). The present study used μCT image-based analysis to test the hypothesis that the increased femoral fracture force and stiffness in Pten-CKO were due to greater section properties with the same effective material properties as that of the WT. The second moment of area and section modulus were computed in ImageJ 1.46 (National Institutes of Health) and used to predict the effective flexural modulus and the stress at failure for fourteen pairs of intact and callus WT and twelve pairs of intact and callus Pten-CKO femurs. For callus and intact femurs, the failure stress and tissue mineral density of the Pten-CKO and WT were not different; however, the section properties of the Pten-CKO were more than twice as large 28 days post-fracture. It was therefore concluded, when the gene Pten was conditionally knocked-out in osteoblasts, the resulting increased bending stiffness and force to fracture were due to increased section properties. (C) 2014 Elsevier Ltd. All rights reserved.  
  Address [Collins, Caitlyn J.; Vivanco, Juan F.; Sokn, Scott A.; Ploeg, Heidi-Lynn] Univ Wisconsin, Dept Mech Engn, Madison, WI 53706 USA, Email: ploeg@engr.wisc.edu  
  Corporate Author Thesis  
  Publisher Elsevier Sci Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0021-9290 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000349194800018 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 454  
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Author Norambuena-Contreras, J.; Gonzalez-Torre, I.; Vivanco, J.F.; Gacitua, W. pdf  doi
openurl 
  Title Nanomechanical properties of polymeric fibres used in geosynthetics Type Journal Article
  Year 2016 Publication Polymer Testing Abbreviated Journal Polym. Test  
  Volume 54 Issue Pages 67-77  
  Keywords Polymeric fibres; Geosynthetics; Nanomechanical properties; Nanoindentation; Damage evaluation  
  Abstract Geosynthetics are composite materials manufactured using different types of polymeric fibres, usually employed as anti-reflective cracking systems in asphalt pavements. Materials that compose geosynthetics can be damaged due to mechanical and thermal effects produced during the installation process under hot mix asphalts. In this paper, different polymeric fibres extracted from geosynthetics have been evaluated using nanoindentation tests. The main objective was to evaluate the effect of installation process (dynamic compaction and thermal damage) on the mechanical behaviour of individual polymeric fibres at nano-scale. To do this, elastic modulus (E) and hardness (H) of three different polymeric fibres commonly used in geosynthetics (polypropylene, polyester and polyvinyl-alcohol), in two testing directions and under two different states have been studied. Main conclusions of this work are that mechanical properties of geosynthetics individual fibres can change after installation, producing changes in the behaviour of geosynthetics at macro-scale with consequences in the pavement functionality, and that these changes are different depending on the material that composed the fibres. (C) 2016 Elsevier Ltd. All rights reserved.  
  Address [Norambuena-Contreras, J.; Gonzalez-Torre, I.] Univ Bio Bio, LabMat UBB, Dept Civil & Environm Engn, Concepcion, Chile, Email: irene.gonzaleztorre@gmail.com  
  Corporate Author Thesis  
  Publisher Elsevier Sci Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0142-9418 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000382798300009 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 651  
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Author Slane, J.; Vivanco, J.; Ebenstein, D.; Squire, M.; Ploeg, H.L. pdf  doi
openurl 
  Title Multiscale characterization of acrylic bone cement modified with functionalized mesoporous silica nanoparticles Type Journal Article
  Year 2014 Publication Journal Of The Mechanical Behavior Of Biomedical Materials Abbreviated Journal J. Mech. Behav. Biomed. Mater.  
  Volume 37 Issue Pages 141-152  
  Keywords Bone cement; Mechanical properties; Nanoindentation; Reinforced polymer; Orthopedics  
  Abstract Acrylic bone cement is widely used to anchor orthopedic implants to bone and mechanical failure of the cement mantle surrounding an implant can contribute to aseptic loosening. In an effort to enhance the mechanical properties of bone cement, a variety of nanoparticles and fibers can be incorporated into the cement matrix. Mesoporous silica nanoparticles (MSNs) are a class of particles that display high potential for use as reinforcement within bone cement. Therefore, the purpose of this study was to quantify the impact of modifying an acrylic cement with various low-loadings of mesoporous silica. Three types of MSNs (one plain variety and two modified with functional groups) at two loading ratios (0.1 and 0.2 wt/wt) were incorporated into a commercially available bone cement. The mechanical properties were characterized using four-point bending, microindentation and nanoindentation (static, stress relaxation, and creep) while material properties were assessed through dynamic mechanical analysis, differential scanning calorimetry, thermogravimetric analysis, FTIR spectroscopy, and scanning electron microscopy. Four-point flexural testing and nanoindentation revealed minimal impact on the properties of the cements, except for several changes in the nano-level static mechanical properties. Conversely, microindentation testing demonstrated that the addition of MSNs significantly increased the microhardness. The stress relaxation and creep properties of the cements measured with nanoindentation displayed no effect resulting from the addition of MSNs. The measured material properties were consistent among all cements. Analysis of scanning electron micrographs images revealed that surface functionalization enhanced particle dispersion within the cement matrix and resulted in fewer particle agglomerates. These results suggest that the loading ratios of mesoporous silica used in this study were not an effective reinforcement material. Future work should be conducted to determine the impact of higher MSN loading ratios and alternative functional groups. (C) 2014 Elsevier Ltd. All rights reserved.  
  Address [Slane, Josh; Ploeg, Heidi-Lynn] Univ Wisconsin, Mat Sci Program, Madison, WI 53706 USA, Email: jaslane@wisc.edu  
  Corporate Author Thesis  
  Publisher Elsevier Science Bv Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1751-6161 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000340987100015 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 404  
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Author Slane, J.; Vivanco, J.; Rose, W.; Ploeg, H.L.; Squire, M. pdf  doi
openurl 
  Title Mechanical, material, and antimicrobial properties of acrylic bone cement impregnated with silver nanoparticles Type Journal Article
  Year 2015 Publication Materials Science & Engineering C-Materials For Biological Applications Abbreviated Journal Mater. Sci. Eng. C-Mater. Biol. Appl.  
  Volume 48 Issue Pages 188-196  
  Keywords Bone cement; Infection; Nanoparticles; Antimicrobial; Mechanical properties  
  Abstract Prosthetic joint infection is one of the most serious complications that can lead to failure of a total joint replacement. Recently, the rise of multidrug resistant bacteria has substantially reduced the efficacy of antibiotics that are typically incorporated into acrylic bone cement. Silver nanoparticles (AgNPs) are an attractive alternative to traditional antibiotics resulting from their broad-spectrum antimicrobial activity and low bacterial resistance. The purpose of this study, therefore, was to incorporate metallic silver nanoparticles into acrylic bone cement and quantify the effects on the cement's mechanical, material and antimicrobial properties. AgNPs at three loading ratios (025, 0.5, and 1.0% wt/wt) were incorporated into a commercial bone cement using a probe sonication technique. The resulting cements demonstrated mechanical and material properties that were not substantially different from the standard cement. Testing against Staphylococcus aureus and Staphylococcus epidermidis using Kirby-Bauer and time-kill assays demonstrated no antimicrobial activity against planktonic bacteria. In contrast, cements modified with AgNPs significantly reduced biofilm formation on the surface of the cement. These results indicate that AgNP-loaded cement is of high potential for use in primary arthroplasty where prevention of bacterial surface colonization is vital. (C) 2014 Elsevier B.V. All rights reserved.  
  Address [Slane, Josh; Squire, Matthew] Univ Wisconsin, Dept Orthoped & Rehabil, Madison, WI USA, Email: jaslane@wisc.edu  
  Corporate Author Thesis  
  Publisher Elsevier Science Bv Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0928-4931 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000348749200025 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 623  
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Author Slane, J.A.; Vivanco, J.F.; Rose, W.E.; Squire, M.W.; Ploeg, H.L. pdf  doi
openurl 
  Title The influence of low concentrations of a water soluble poragen on the material properties, antibiotic release, and biofilm inhibition of an acrylic bone cement Type Journal Article
  Year 2014 Publication Materials Science & Engineering C-Materials For Biological Applications Abbreviated Journal Mater. Sci. Eng. C-Mater. Biol. Appl.  
  Volume 42 Issue Pages 168-176  
  Keywords Bone cement; Infection; Drug release; Mechanical properties; Biofilm  
  Abstract Soluble particulate fillers can be incorporated into antibiotic-loaded acrylic bone cement in an effort to enhance antibiotic elution. Xylitol is a material that shows potential for use as a filler due to its high solubility and potential to inhibit biofilm formation. The objective of this work, therefore, was to investigate the usage of low concentrations of xylitol in a gentamicin-loaded cement. Five different cements were prepared with various xylitol loadings (0, 1, 2.5, 5 or 10 g) per cement unit, and the resulting impact on the mechanical properties, cumulative antibiotic release, biofilm inhibition, and thermal characteristics were quantified. Xylitol significantly increased cement porosity and a sustained increase in gentamicin elution was observed in all samples containing xylitol with a maximum cumulative release of 41.3%. Xylitol had no significant inhibitory effect on biofilm formation. All measured mechanical properties tended to decrease with increasing xylitol concentration; however, these effects were not always significant. Polymerization characteristics were consistent among all groups with no significant differences found. The results from this study indicate that xylitol-modified bone cement may not be appropriate for implant fixation but could be used in instances where sustained, increased antibiotic elution is warranted, such as in cement spacers or beads. (C) 2014 Elsevier B.V. All rights reserved.  
  Address [Slane, Josh A.; Ploeg, Heidi-Lynn] Univ Wisconsin, Mat Sci Program, Madison, WI 53706 USA, Email: jaslane@wisc.edu  
  Corporate Author Thesis  
  Publisher Elsevier Science Bv Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0928-4931 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000340687400024 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 403  
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