<>
body.no-scroll {
overflow-y: auto !important;
}
#erp-banner .swiper-slide img{
width: 100%;
height: 100%;
}
.header_v4 .header_middle .logo{
width: 258px;
}
.userInfo{
height: 45px;
line-height: 45px;
display: flex;
align-items: center;
left: 12px;
padding-right: 8px;
}
.userInfo .phone{
font-size: 14px;
font-family: PingFangSC-RegularPingFang SC;
font-weight: 400;
color: #56BEB2;
max-width: 70px;
white-space: nowrap;
overflow:hidden;
text-overflow:ellipsis;
display: inline-block;
margin-right: 4px;
}
.userInfo img{
width: 10px;
transform: rotate(180deg);
}
.userInfo:hover .dropdown_box {
height: 355px;
}
.userInfo .dropdown_box{
left: -60px!important;
}
.userInfo:hover > img{
transform: rotate(0deg);
-webkit-transform: rotate(0deg);
-moz-transform: rotate(0deg);
-ms-transform: rotate(0deg);
-o-transform: rotate(0deg);
transition: transform 0.2s;
-moz-transition: -moz-transform 0.2s;
-moz-transition: -moz-transform 0.2s;
-o-transition: -o-transform 0.2s;
-ms-transition: -ms-transform 0.2s;
}
.header_middle .newLogin{
display: inline-block;
margin-left: 10px;
height: 45px;
line-height: 45px;
font-size: 0;
}
.header_middle .newLogin a{
font-size: 16px;
font-family: PingFang-SC-BoldPingFang-SC;
font-weight: bold;
color: rgba(0000.85);
padding: 0 12px;
height: 18px;
}
.header_middle .newLogin a:first-child{
border-right: 1px solid #D9D9D9;
}
.header_middle .newLogin a:last-child{
padding-right: 0;
}
.header_v4 .category-nav {
height: 0;
transition: all .2s ease;
position: fixed;
z-index: -1;
top: 0;
left: 0;
right: 0;
bottom: 0;
overflow: hidden;
}
.header_v4 .category-nav .category-mask {
display: none;
position: fixed;
z-index: -1;
top: 0;
right: 0;
left: 0;
bottom: 0;
background: rgba(0,0,0,0.4);
}
.header_v4 .category-nav .category-mask.show {
display: block;
}
.header_v4 .category-nav.show {
height: 100%;
}
.header_v4 .category-nav.shrink {
padding-top: 56px !important;
}
.header_v4 .category-nav .category-nav-wrap {
background: #fff;
border-top: 1px solid #E8E8E8;
padding-top: 10px;
padding-bottom: 60px;
max-height: calc(100vh - 320px);
overflow-y: auto;
}
.header_v4 .category-nav .category-nav-wrap.type2 {
padding-bottom: 40px;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content {
margin: 0 auto;
display: flex;
flex-wrap: wrap;
align-content: flex-start;
width: 1080px;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-drafting-item {
width: 270px;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-drafting-item .nav-title {
position: relative;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
margin: 30px 0 0;
text-align: center;
font-size: 16px;
font-family: PingFang-SC-BoldPingFang-SC;
color: rgba(0000.85);
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-drafting-item:not(:last-child) .nav-title::after {
content: "";
position: absolute;
top: 0;
right: 0;
width: 1px;
height: 169px;
background: #E8E8E8;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-drafting-item .nav-title img {
width: 150px;
margin-bottom: 16px;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-simulate-title {
font-size: 16px;
font-family: PingFang-SC-BoldPingFang-SC;
font-weight: bold;
color: #16B799;
width: 1080px;
margin: 30px auto 0;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-biologys-title {
font-size: 16px;
font-family: PingFang-SC-BoldPingFang-SC;
font-weight: bold;
color: #16B799;
width: 1080px;
margin: 30px auto 0;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item.category-nav-simulate-item {
margin-top: 30px;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item.category-nav-analysis-item {
margin-right: 38px;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item.category-nav-simulate-item.category-nav-item.category-nav-buffets-item {
width: 180px;
padding-left: 20px;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item.category-nav-simulate-item .nav-title::after {
content: "";
position: absolute;
bottom: 0;
left: 0;
width: 120px;
height: 1px;
background: #E8E8E8;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item {
width: 180px;
padding-left: 20px;
margin-top: 30px;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item .nav-title{
position: relative;
display: flex;
align-items: center;
padding: 0 0 14px;
font-size: 14px;
font-family: PingFang-SC-BoldPingFang-SC;
color: rgba(0000.85);
overflow: hidden;
text-overflow:ellipsis;
white-space: nowrap;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item .nav-title img {
width: 24px;
height: 24px;
margin-right: 8px;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item .nav-title:hover {
color: #16B799;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item .nav-title::after {
content: "";
position: absolute;
bottom: 0;
left: 0;
width: 120px;
height: 1px;
background: #E8E8E8;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item .nav-child-list {
padding: 6px 0;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item .nav-child-list .nav-child-item {
cursor: pointer;
margin-top: 8px;
font-size: 14px;
color: rgba(0000.75);
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item .nav-child-list .nav-child-item a {
color: inherit;
}
.header_v4 .category-nav .category-nav-wrap .category-nav-content .category-nav-item .nav-child-list .nav-child-item:hover {
color: #16B799;
}
.register-new-guide {
display: none;
position: fixed;
z-index: 10001;
top: 160px;
padding: 17px 20px 22px 20px;
box-sizing: border-box;
width: 420px;
background: linear-gradient(180deg#D6FFFA 0%#FFFFFF 30%);
box-shadow: 0px 2px 4px 2px rgba(0,0,0,0.15);
border-radius: 20px;
}
.register-new-guide.has-dot::before {
content: "";
position: absolute;
top: -71px;
right: 13px;
width: 6px;
height: 6px;
background: #56BEB2;
border-radius: 100%;
}
.register-new-guide.has-dot::after {
content: "";
position: absolute;
top: -66px;
right: 15px;
width: 1px;
height: 67px;
background: #56BEB2;
}
.register-new-guide .close-img{
position: absolute;
top: 24px;
right: 24px;
width: 15px;
height: 14px;
cursor: pointer;
}
.register-new-guide .wawa-box {
display: flex;
align-items: center;
}
.register-new-guide .wawa1-gif {
width: 55px;
height: 56px;
}
.register-new-guide-title {
font-size: 16px;
font-family: PingFang-SC-BoldPingFang-SC;
font-weight: bold;
color: rgba(0,0,0,0.75);
line-height: 26px;
padding-left: 13px;
}
.register-new-guide-desc {
font-size: 14px;
font-family: PingFangSC-RegularPingFang SC;
font-weight: 400;
color: rgba(0,0,0,0.75);
line-height: 28px;
margin-top: 24px;
}
.register-new-guide .equity-list {
word-break: break-all;
margin-top: 12px;
font-size: 14px;
font-family: PingFangSC-RegularPingFang SC;
font-weight: 400;
color: rgba(0,0,0,0.75);
line-height: 24px;
}
.register-new-guide .equity-list li {
display: flex;
}
.register-new-guide .equity-list li:not(:first-child) {
margin-top: 7px;
}
.register-new-guide .equity-list li .check-img {
position: relative;
top: 4px;
width: 16px;
height: 16px;
margin-right: 8px;
}
.register-new-guide .equity-list .active-txt,
.register-new-guide .equity-list .active-money {
font-size: 14px;
font-family: PingFang-SC-BoldPingFang-SC;
font-weight: bold;
color: #56BEB2;
}
.register-new-guide .equity-list .active-txt2 {
font-size: 14px;
font-family: PingFangSC-RegularPingFang SC;
font-weight: 400;
color: #56BEB2;
}
.register-new-guide .equity-list .active-txt2>img {
width: 10px;
height: 13px;
margin-left: 6px;
}
.register-new-guide .equity-list .active-txt2 .active-img {
display: none;
}
.register-new-guide .equity-list .active-txt2:hover {
color: #16B799;
}
.register-new-guide .equity-list .active-txt2:hover .active-img {
display: initial;
}
.register-new-guide .equity-list .active-txt2:hover .default-img {
display: none;
}
.register-new-guide-btn {
margin-top: 17px;
cursor: pointer;
display: flex;
justify-content: center;
align-items: center;
width: 372px;
height: 48px;
background: #56BEB2;
box-shadow: inset 0px 1px 3px 2px rgba(255,251,251,0.78);
border-radius: 23px;
font-size: 16px;
font-family: PingFang-SC-BoldPingFang-SC;
font-weight: bold;
color: #FFFFFF;
}
.register-new-guide-btn:hover {
background: #16B799;
color: #FFFFFF;
}
.register-new-guide-arrow-img {
width: 18px;
height: 14px;
margin-left: 9px;
animation: footerNewAccountGuide2 .4s linear infinite alternate;
-webkit-animation: footerNewAccountGuide2 .4s linear infinite alternate;
}
@keyframes footerNewAccountGuide2
{
from {opacity: 0;}
to {opacity: 1;}
}
@-webkit-keyframes footerNewAccountGuide2
{
from {opacity: 0;}
to {opacity: 1;}
}
.register-new-guide .hand-img {
position: absolute;
width: 69px;
height: 55px;
top: 124px;
left: -104px;
animation: handAnimation .4s linear infinite alternate;
-webkit-animation: handAnimation .4s linear infinite alternate;
}
@keyframes handAnimation
{
from {left: -149px;}
to {left: -104px;}
}
@-webkit-keyframes handAnimation
{
from {left: -149px;}
to {left: -104px;}
}
.register-new-guide .handhu-img {
opacity: 0;
position: absolute;
width: 9px;
height: 19px;
top: 136px;
left: -40px;
animation: handhuAnimation .8s linear 0.4s infinite;
-webkit-animation: handhuAnimation .8s 0.4s linear infinite;
}
@keyframes handhuAnimation
{
from {left: -40px;opacity: 1;}
to {left: -60px;opacity: 0;}
}
@-webkit-keyframes handhuAnimation
{
from {left: -40px;opacity: 1;}
to {left: -60px;opacity: 0;}
}
.group-icon{
width:32px;
height:32px;
margin:4px 0 0 20px;
position: relative;
cursor: pointer;
}
.group-icon img{
width:32px;
height:32px;
}
.invite-notify{
width: 172px;
min-height:241px;
box-sizing: border-box;
background-image: url("//cdn0.shiyanjia.com/c/2023/images/group/2.png");
background-size: 100% 100%;
position: absolute;
overflow: hidden;
bottom:-248px;
right:-6px;
z-index:9;
padding-bottom:20px;
/* display:none; */
}
.invite-notify .hidden{
width:14px;
height:14px;
position: absolute;
top:21px;
right:16px;
cursor: pointer;
}
.invite-notify .tips{
margin:27px auto 8px;
font-size: 16px;
text-align: center;
font-family: PingFangSC-RegularPingFang SC;
font-weight: 400;
color: rgba(0,0,0,0.65);
line-height: 22px;
}
.invite-notify .content{
padding:0 18px;
text-align: center;
font-size: 14px;
font-family: PingFangSC-RegularPingFang SC;
font-weight: 400;
color: rgba(0,0,0,0.65);
line-height: 22px;
}
.invite-notify .content span{
font-weight: bold;
color: rgba(0,0,0,0.85);
}
.invite-notify .join-group{
width: 96px;
height: 36px;
background: #56BEB2;
border-radius: 23px;
margin:12px auto 4px;
font-size: 14px;
font-family: PingFangSC-BoldPingFang SC;
font-weight: bold;
color: #FFFFFF;
text-align: center;
line-height: 36px;
cursor: pointer;
}
.invite-notify .cancel-join{
font-size: 14px;
font-family: PingFangSC-RegularPingFang SC;
font-weight: 400;
color: rgba(0,0,0,0.45);
line-height: 20px;
text-align: center;
cursor: pointer;
}
.header-invite-msg{
height: 58px;
background: #FFFBE6;
border-radius: 2px;
border: 1px solid #FFE58F;
font-size: 16px;
font-family: PingFangSC-RegularPingFang SC;
font-weight: 400;
color: rgba(0,0,0,0.85);
line-height: 26px;
box-sizing:border-box;
padding:0 26px;
display:flex;
align-items:center;
z-index:9;
position: absolute;
top:10vh;
left:50%;
transform: translateX(-50%);
}
.header-invite-msg img{
width:24px;
height:24px;
margin-right:8px;
}
.header-invite-msg2{
height: 84px;
background: #EFF8F7;
border-radius: 2px;
border: 1px solid #56BEB2;
box-sizing:border-box;
padding:16px 26px;
display:flex;
z-index:9;
position: absolute;
top:10vh;
left:50%;
transform: translateX(-50%);
}
.header-invite-msg2 img{
width:24px;
height:25px;
margin-right:16px;
}
.header-invite-msg2-right div:first-child{
font-size: 16px;
font-family: PingFangSC-RegularPingFang SC;
font-weight: 400;
color: rgba(0,0,0,0.85);
line-height: 26px;
margin-bottom:4px;
margin-top:-4px;
}
.header-invite-msg2-right div:last-child{
font-size: 14px;
font-family: PingFangSC-RegularPingFang SC;
font-weight: 400;
color: rgba(0,0,0,0.65);
line-height: 22px;
}
[v-cloak]{
display: none;
}
<>
.common-poster-modal {
position: fixed;
z-index: 10000;
width: 100%;
height: 100%;
top: 0;
left: 0;
display: flex;
justify-content: center;
align-items: center;
}
.common-poster-modal .common-poster-modal-mask {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0,0,0,0.5);
}
.common-poster-modal .common-poster-modal-content {
position: relative;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
}
.common-poster-modal .poster-img {
width: 100%;
}
.common-poster-modal .poster-close-img {
cursor: pointer;
position: absolute;
bottom: -16%;
width: 5.3%;
}
.common-poster-modal .poster-link {
cursor: pointer;
position: absolute;
display: block;
left: 6%;
right: 6%;
bottom: -9%;
}
.common-poster-modal .poster-link img {
display: block;
width: 100%;
height: 100%;
}
.common-poster-modal .poster-link .poster-link-initial-btn,
.common-poster-modal .poster-link:hover .poster-link-active-btn {
display: block;
}
.common-poster-modal .poster-link:hover .poster-link-initial-btn,
.common-poster-modal .poster-link .poster-link-active-btn {
display: none;
}
<>
/** 首页改版样式统一 */
#erp-banner {
width: 150px!important;
height: 44px!important;
display: inline-block;
margin: auto;
overflow: hidden;
}
.header-logo {
width: 184px;
height: auto;
margin-right: 17px;
}
.header-center {
position: relative;
-webkit-box-pack: justify;
-webkit-justify-content: space-between;
-ms-flex-pack: justify;
justify-content: space-between;
-webkit-box-align: center;
-webkit-align-items: center;
-ms-flex-align: center;
align-items: center;
padding-bottom: 6px;
font-size: 16px;
display: flex;
}
#commomHeader.header_v4 .header_middle {
padding-top: 17px;
}
.header_v4 .header_middle .header-center .search_box {
position: relative;
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-webkit-align-items: center;
-ms-flex-align: center;
align-items: center;
-webkit-box-flex: 1;
-webkit-flex: 1;
-ms-flex: 1;
flex: 1;
height: 40px;
margin: 3px 0 3px 28px;
border: 1px solid #27B7AA;
border-radius: 4px;
}
.header_v4 .header-center .h_v4_btn.search {
border-top-right-radius: 4px;
border-bottom-right-radius: 4px;
background: #27B7AA;
width: 80px;
}
.deposit_box-category-tag {
display: inline;
height: 19px;
line-height: 19px;
position: absolute;
top: -7px;
right: 11px;
background: linear-gradient(108deg#FFA000 0%#FB7336 100%);
border-radius: 19px 19px 19px 0px;
padding: 0 9px;
font-weight: bold;
font-size: 12px;
color: #fff;
}
.header_v4 .header-center .h_v4_btn.lk_recharge.header_v4 .header-center .h_v4_btn.lk_command {
border: 1px solid #27B7AA;
border-radius: 4px;
}
.header_v4 .header-center .h_v4_btn.search:hover.header_v4 .header-center .h_v4_btn.lk_recharge:hover.header_v4 .header-center .h_v4_btn.lk_command:hover {
background: #0b978b;
color: #FFFFFF;
}
.header_v4 .header-center .h_v4_btn.lk_command {
color: #27B7AA;
margin-right: 21px;
}
.header_v4 .header-center .h_v4_btn.lk_recharge {
margin: 3px 20px;
}
.header-center .userInfo .header-dropdown .dropdown-item .header-account-amount_tag {
display: inline-block;
width: 60px;
height: 19px;
margin-left: 6px;
border-radius: 2px;
background-image: -webkit-gradient(linearleft topleft bottomfrom(#ffae25)to(#ff6000));
background-image: linear-gradient(#ffae25#ff6000);
color: #fff;
font-size: 12px;
line-height: 19px;
text-align: center;
}
.header-center .userInfo .header-dropdown .dropdown-item:nth-child(10) {
border-bottom: 1px solid #E9E9E9;
height: 50px;
line-height: 50px;
}
.header-center .userInfo .header-dropdown .dropdown-item:nth-child(7) {
height: 42px;
line-height: 42px;
border: none;
}
.header-center .userInfo:hover .dropdown_box {
height: 562px;
}
.header-center .dropdown-item:hover {
color: #27b7aa;
}
.header_middle .header-center .newLogin {
margin: 0;
}
.header_v4 .header_middle .search_input {
width: calc(100% - 80px);
}
.search-part {
-webkit-box-flex: 1;
-webkit-flex-grow: 1;
-ms-flex-positive: 1;
flex-grow: 1;
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
}
.header_container_top {
display: flex;
}
.header_v4 .header_top .header_container_top ul li.h_code:hover .dropdown_box {
width: 324px;
height: 212px;
}
.header_v4 .header_top .header_container_top ul li div.dropdown_box.userInfo .dropdown_box {
right: 0;
flex-direction: row;
text-align: center;
left: auto;
}
.header_v4 .header_top .header_container_top .dropdown_box_item {
margin-right: 44px;
}
.dropdown_box_code {
width: 122px;
height: 122px;
}
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<>
.sci-price-tag {
width: 59px;
height: 54px;
background: url("//cdn0.shiyanjia.com/c/2022/images/order/price_tag.png") no-repeat;
position: absolute;
padding-top: 8px;
line-height: 16px;
font-size: 13px;
color: #FFF;
font-weight: bold;
text-align: center;
}
.sci-price-tag p {
line-height: 16px;
font-size: 13px;
color: #FFF;
font-weight: bold;
text-align: center;
}
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仪器型号
麦克ASAP2460；美国Micromeritics 3Flex； 康塔AUTOSORB IQ；康塔QUADRASORB SI等
已测试样品
40.21万个
部分论文致谢
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常见问题
1. 为什么得到的BET值为负？
答：正常情况下样品对吸附质有吸附的话比表面积值应该为正，出现负值的可能有三种原因：
1. 样品自身的原因，可以看等温吸脱附曲线，如果没有吸附的话吸附值应该在0附近，再加上仪器误差的现象，也可能跑到负值出现吸附点，所以该类样品的吸附几乎可以忽略。
2. 测试所加样品量过少，造成总的吸附值很低，则容易产生这个现象。
3. 脱气温度和时间不合理，脱气温度过高，造成孔结构的变化或坍塌，脱附温度太低或者脱气时间短，造成脱气不完全，也会产生这个问题。
2. 为什么等温吸脱附曲是不闭合的？
答：等温吸脱附曲线不闭合，这种情况比较常见，产生这种现象的原因也比较多，可能原因如下：1. 材料表面存在特殊的基团和化学性能，导致吸附的气体分子无法完全脱离，即材料对吸附质有较强作用，导致吸脱附会存在一定的不闭合程度；2. 材料自身的比表面较小，一般吸脱附闭合程度会较差；3. 称样量问题，称样量太少，容易造成测量不准，也会出现此类情况；4. 样品前处理问题，温度太高，测试的孔结构坍塌，气体脱附不出来会造成曲线不闭合； 5. 如果研究碳材料的话需要注意，碳材料的孔大多为柔性孔或者墨水瓶孔，气体吸附之后孔口直径收缩，导致吸附上的气体不易脱附，很容易导致吸脱附曲线不闭合。
3. BJH脱附孔径分布为什么存在“假峰”？
答：在气体脱附过程中大多数情况下都反映了一个滞后的过程。所以在用BJH方法分析样品孔径时，脱附段很容易出现假峰，一般是在3.8nm处出现，出现假峰的原因与孔的类型有关系，内部孔道的连通性，孔型的多样性以及孔径的分散性等等原因都会导致在脱附过程中出现假峰。
4. 为什么BET方程参数里面的C值为负？
答：C值具有一定的物理含义，它代表了样品的吸附热，正常情况下应该为正值。当遇到C值为负的情况时，我们首先要看C值负有多大，如果是很大的负值，可去除高压区数据再重新拟合一下，或者把压力选点范围降低即可。如果是较小的负值，通常微孔样品容易出现这个问题，对于微孔材料，因为吸附物质的分子是在非常狭窄的微孔，所以它与BET方法的假设会严重偏离，如果使用BET模型计算就会得到一个明显小于样品的正常的比表面积。因此对于微孔的样品一般推荐用Langmuir方法来计算比表面积。
5. 为什么等温吸脱附曲是交叉的？
答：吸附曲线和脱附曲线发生交叉的主要原因是：1. 样品吸附值本身就比较小，容易出现波动；2. 脱气条件不合适，脱气温度低或者时间短，水分没有完全除去，在脱附过程中脱去了；3. 实验过程中发生了漏气，如样品管没有拧紧或者样品管上面O形圈老化都会造成密封不严，造成等温吸附曲线和等温脱附曲线产生交叉的现象。
6. 为什么孔径分布图为什么不是从0开始？
答：1. 一般孔径分布图是从开始有孔的地方出现数据，低压处无孔则不会出现数据。2. 与使用的吸附质有关，孔径分布数据理论上最小只能从吸附质的直径开始。
7. BET结果与SEM或TEM结果不符合，原因是什么？
答：常见情况为SEM或TEM图片中能看到孔，但是BET结果中显示无孔或孔很少，或者BET测到的孔和电镜中看到的不一致。这主要是因为BET测试的是样品整体的孔情况，电镜看到的是局部的情况，所以会有不一致的情况，而且倍数太高的话，SEM的标尺是可能有一定误差的，所以两者可比性并不太大。
8. 物理吸附中吸附质如何进行选择？
答：具体内容介绍详见公众号【铅笔解析】推文，https://mp.weixin.qq.com/s/CPvCyfpF0FSYHCAn1Qr0Yw
9. BET报告怎么解读和分析？
答：具体内容介绍详见公众号【铅笔解析】推文，https://mp.weixin.qq.com/s/RPpQIgSuaOQu_R5VgVAMIg
10. 如何确定样品的脱气时间?
答：脱气时间越长，样品预处理效果越好。脱气时间的选择与样品孔道的复杂程度有关。一般来说，孔道越复杂，微孔含量越高，脱气时间越长；选择的脱气温度越低，样品所需要的脱气时间也就越长。IUPAC 推荐脱气时间不少于 6 小时，而那些需要低温脱气的样品则需要更长的脱气时间。
11. 如何选择样品的脱气温度？
答：系统温度越高，分子扩散运动越快，因此脱气效果越好。
选择脱气温度的首要原则是不破坏样品结构。如果脱气温度设置过高，会导致样品结构的不可逆变化，例如烧结会降低样品的比表面积，分解会提高样品的比表面积。但是如果为了保险，脱气温度设置过低，就可能使样品表面处理不完全， 导致分析结果偏小。
因此在不确定脱气温度的情况下，建议使用化学手册，如 the Handbook of Chemistry and Physics (CRCBoca RatonFlorida)，以及各标准组织发布的标准方法，如 ASTM，作为相关参考。 脱气温度的选择不能高于固体的熔点或玻璃的相变点建议不要超过熔点温度的一半。当然，如果条件许可，使用热分析仪能够最精确地得到适合的脱气温度。一般而言，脱气温度应当是热重曲线上平台段的温度。
12. BJH模型和HK模型的适用范围分别是什么？
答：BJH模型适用于分析介孔材料，而HK模型适用于裂缝状微孔材料（如活性炭、柱撑层状粘土等）。
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position: absolute;
top: -25px;
right: 33px;
width: 97px;
height: 78px;
}
.replenish-alert-content h4 {
line-height: 25px;
margin-bottom: 20px;
font-size: 18px;
color: rgba(000.75);
font-weight: bold;
text-align: center;
}
.replenish-alert-content p {
line-height: 26px;
margin-bottom: 24px;
font-size: 14px;
color: rgba(000.75);
}
.replenish-btn-group {
display: flex;
justify-content: center;
}
.replenish-btn-group a {
display: block;
width: 98px;
height: 32px;
line-height: 30px;
background: #FFF;
margin: 0 10px;
font-size: 14px;
color: rgba(000.65);
text-align: center;
border: 1px solid #E8E8E8;
border-radius: 2px;
}
.replenish-btn-group a.active {
background: #56BEB2;
color: #FFF;
border-color: #56BEB2;
}
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