Reading PAGE

Peer Evaluation activity

Downloads 38
Views 18
Full text requests 4

Total impact ?

    Send a

    Jonathan has...

    Trusted 0
    Reviewed 0
    Emailed 0
    Shared/re-used 0
    Discussed 0
    Invited 0
    Collected 0

     

    This was brought to you by:

    block this user Jonathan Knowles

    Professor

    UCL

    Synthesis and characterisation of magnesium substituted calcium phosphate bioceramic nanoparticles made via continuous hydrothermal flow synthesis

    Export to Mendeley

    Continuous hydrothermal flow synthesis (CHFS) technology has been used as an efficient and direct route to produce a range of largely crystalline magnesium substituted calcium phosphate bioceramics. Initially, magnesium substituted hydroxyapatite, Mg-HA, according to the formula Ca10-xMgx(PO4)(6)(OH)(2) was prepared in the CHFS system for x = 0.2 where x:(10-x) is the Mg:Ca ratio used in the reagents. Biphasic mixtures of Mg-HA and Mg-whitlockite were obtained corresponding to x values in the range x = 0.4-1.6. The direct synthesis of phase pure crystalline Mg-whitlockite based on the formula (Ca3-yMgy(HPO4)(z)(PO4)(2-2z/3) was also achieved using the CHFS system for the range y = 0.7-1.6 (this corresponds to the range x = 1.6-5.3). With increasing substitution of magnesium for calcium, the material became ever more amorphous and the BET surface area generally increased. All the as-precipitated powders (without any additional heat treatments) were analyzed using techniques including X-ray powder diffraction, Raman spectroscopy and Fourier transform infra-red spectroscopy. Transmission electron microscopy (TEM) images revealed that in the case of y 1.2, the Mg-whitlockite material comprised of ca. 28 nm sized spheres. The use of the CHFS system in this context facilitated rapid production of combinations of particle properties (crystallinity, size, shape) that were hitherto unobtainable in a single step process.

    Oh la laClose

    Your session has expired but don’t worry, your message
    has been saved.Please log in and we’ll bring you back
    to this page. You’ll just need to click “Send”.

    Your evaluation is of great value to our authors and readers. Many thanks for your time.

    Review Close

    Short review
    Select a comment
    Select a grade
    You and the author
    Anonymity My review is anonymous( Log in  or  Register )
    publish
    Close

    When you're done, click "publish"

    Only blue fields are mandatory.

    Relation to the author*
    Overall Comment*
    Anonymity* My review is anonymous( Log in  or  Register )
     

    Focus & Objectives*

    Have the objectives and the central topic been clearly introduced?

    Novelty & Originality*

    Do you consider this work to be an interesting contribution to knowledge?

    Arrangement, Transition and Logic

    Are the different sections of this work well arranged and distributed?

    Methodology & Results

    Is the author's methodology relevant to both the objectives and the results?

    Data Settings & Figures

    Were tables and figures appropriate and well conceived?

    References and bibliography

    Is this work well documented and has the bibliography been properly established?

    Writing

    Is this work well written, checked and edited?

    Write Your Review (you can paste text as well)
    Please be civil and constructive. Thank you.


    Grade (optional, N/A by default)

    N/A 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10
    Close

    Your mailing list is currently empty.
    It will build up as you send messages
    and links to your peers.

     No one besides you has access to this list.
    Close
    Enter the e-mail addresses of your recipients in the box below.  Note: Peer Evaluation will NOT store these email addresses   log in
    Your recipients

    Your message:

    Your email : Your email address will not be stored or shared with others.

    Your message has been sent.

    Description

    Title : Synthesis and characterisation of magnesium substituted calcium phosphate bioceramic nanoparticles made via continuous hydrothermal flow synthesis
    Author(s) : AA Chaudhry, J Goodall, M Vickers, JK Cockcroft, I Rehman, JC Knowles, JA Darr
    Abstract : Continuous hydrothermal flow synthesis (CHFS) technology has been used as an efficient and direct route to produce a range of largely crystalline magnesium substituted calcium phosphate bioceramics. Initially, magnesium substituted hydroxyapatite, Mg-HA, according to the formula Ca10-xMgx(PO4)(6)(OH)(2) was prepared in the CHFS system for x = 0.2 where x:(10-x) is the Mg:Ca ratio used in the reagents. Biphasic mixtures of Mg-HA and Mg-whitlockite were obtained corresponding to x values in the range x = 0.4-1.6. The direct synthesis of phase pure crystalline Mg-whitlockite based on the formula (Ca3-yMgy(HPO4)(z)(PO4)(2-2z/3) was also achieved using the CHFS system for the range y = 0.7-1.6 (this corresponds to the range x = 1.6-5.3). With increasing substitution of magnesium for calcium, the material became ever more amorphous and the BET surface area generally increased. All the as-precipitated powders (without any additional heat treatments) were analyzed using techniques including X-ray powder diffraction, Raman spectroscopy and Fourier transform infra-red spectroscopy. Transmission electron microscopy (TEM) images revealed that in the case of y 1.2, the Mg-whitlockite material comprised of ca. 28 nm sized spheres. The use of the CHFS system in this context facilitated rapid production of combinations of particle properties (crystallinity, size, shape) that were hitherto unobtainable in a single step process.
    Keywords : beta tricalcium phosphate, near critical water, one step synthesis, supercritical water, mechanical properties, thermal stability, hydroxyapatite powders, raman spectroscopy, solid solutions, particle size

    Subject : unspecified
    Area : Other
    Language : English
    Year : 2008

    Affiliations UCL
    Journal : Journal of Materials Chemistry
    Volume : 18
    Issue : 48
    Publisher : ROYAL SOC CHEMISTRY
    Pages : 5900
    Url : http://discovery.ucl.ac.uk/169931/

    Leave a comment

    This contribution has not been reviewed yet. review?

    You may receive the Trusted member label after :

    • Reviewing 10 uploads, whatever the media type.
    • Being trusted by 10 peers.
    • If you are blocked by 10 peers the "Trust label" will be suspended from your page. We encourage you to contact the administrator to contest the suspension.

    Does this seem fair to you? Please make your suggestions.

    Please select an affiliation to sign your evaluation:

    Cancel Evaluation Save

    Please select an affiliation:

    Cancel   Save

    Jonathan's Peer Evaluation activity

    Downloads 38
    Views 18
    Full text requests 4

    Jonathan has...

    Trusted 0
    Reviewed 0
    Emailed 0
    Shared/re-used 0
    Discussed 0
    Invited 0
    Collected 0
    Invite this peer to...
    Title
    Start date (dd/mm/aaaa)
    Location
    URL
    Message
    send
    Close

    Full Text request

    Your request will be sent.

    Please enter your email address to be notified
    when this article becomes available

    Your email


     
    Your email address will not be shared or spammed.